• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method in an exhaust gas purification system for a single engine (235) in which a reducing agent is supplied to a duct (290) for exhaust gases from (235) the exhaust gas purification system comprises devices (270) which require a certain said engine exhaust purification purpose. and wherein said temperature level (Tmax) to effect catalytic exhaust purification. The method comprises the steps of: - distributing and storing (s430) a limited amount of reducing agent in said exhaust duct (290) upstream of said devices (270) at a temperature below said certain temperature level (Tmax); and - in the cold start of said exhaust gas purification system, use (s440) said reducing agent to effect said distributed and stored catalytic exhaust gas purification. The invention also relates to a computer program product comprising program code (P) for a computer (200; 210) for implementing a method according to the invention. The invention also relates to a device in a single exhaust gas cleaning system for an engine (235) and a motor vehicle (100) equipped with the device. Figure 3 for publication
    公开号:SE1450606A1
    申请号:SE1450606
    申请日:2014-05-21
    公开日:2014-11-22
    发明作者:Magnus Nilsson；Henrik Birgersson；Andreas Liljestrand
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    is arranged to inject a required amount of reductant into an exhaust system upstream of the SCR catalyst according to drivers stored in a control unit of the vehicle.
    There is a constant need to reduce the amount of emissions from engines of motor vehicles. This applies not least to heavy motor vehicles such as e.g. trucks and buses as legal requirements for emissions are continuously tightened.
    In the so-called cold start of an SCR system of said motor vehicle, it takes a certain time until the components contained therein reach a suitable operating temperature.
    During this time period, no reducing agent is dosed, which means that unwanted emissions cannot be reduced to an appropriate extent. Dosing during this time period does not take place to avoid the formation of reducing agent deposits in the exhaust gas purification system upstream of the SCR catalyst. In some cases, these can be time periods of up to 10 minutes when an engine emits emissions without reducing agents being metered.
    US20050069476 describes a system in which dosing of reducing agents is performed in connection with a shutdown of an engine of a vehicle to effect a storage of ammonia in an SCR catalyst.
    US20120023906 describes a system where dosing of reducing agents is performed in connection with a shutdown of an engine of a vehicle to effect an storage of ammonia in an SCR catalyst.
    However, these solutions are associated with a number of disadvantages, for example an exhaust gas treatment system here must have a rather high temperature in order for said reducing agent to evaporate in a suitable manner. Furthermore, said engine will need to be driven and thereby generate an exhaust gas flow in order for said dosed reducing agent to be supplied to said SCR catalyst. In the said known systems there is also an imminent risk that excessive so-called urea stones are formed, which can persist permanently or often even increase in size with continuous dosing, which will reduce the performance of the SCR system and sometimes lead to a muffler including said SCR catalyst having to be repaired or replaced, with very high costs to sequence.
    SUMMARY OF THE INVENTION An object of the present invention is to provide a new and advantageous method in an exhaust gas purification system for an engine.
    Another object of the invention is to provide a new and advantageous device and a new and advantageous computer program in an exhaust gas purification system for an engine.
    A further object of the invention is to provide a method, an apparatus and a computer program for effecting a reduction in the amount of undesired emissions during a starting process of an engine, where a temperature of a finishing system is below a predetermined temperature, for example 200 degrees Celsius.
    A further object of the invention is to provide a method, an apparatus and a computer program for achieving an increased performance of a platform which includes an engine with an exhaust gas treatment system.
    A further object of the invention is to provide a method, an apparatus and a computer program for achieving an increased performance of SCR systems.
    Some of these objects are achieved with a method in an exhaust gas purification system for an engine according to claim 1. Some of these objects are achieved with a device according to the independent claim 10. Advantageous embodiments are described in the dependent claims hereof.
    According to one aspect of the present invention, there is provided a method of an exhaust gas purification system for an engine wherein a reducing agent is supplied to an exhaust duct from said engine for exhaust purifying purposes and wherein said exhaust purification system includes devices which require a certain temperature level to effect catalytic exhaust purification. The method comprises the steps of: - distributing and storing a limited amount of reducing agent in said exhaust duct upstream of said devices at a temperature below said certain temperature level; and - in the cold start of said exhaust gas purification system, using said distributed and stored reducing agents to effect said catalytic exhaust purification.
    Said limited amount of reducing agent is a suitable amount of reducing agent which is not included by an amount of reducing agent being dosed in continuous dosing during normal, normal or ordinary operation.
    Said limited amount of reducing agent may be, for example, one deciliter, or half a deciliter. Said limited amount of reducing agent is intended to be temporarily stored for use in a cold start of said catalytic devices.
    According to one aspect of the invention, ammonia (NHS) can be released from said distributed and stored reducing agents at a temperature of about 130 degrees Celsius, which ammonia can be advantageously used in said catalytic devices before regular dosing of reducing agents is started. Ordinary dosing of reducing agents is typically started at a temperature of 180-200 degrees Celsius in the SCF1 catalyst. Said distribution of reducing agent is a suitable dispersed distribution. According to one embodiment, said limited amount of reducing agent is distributed over as large an area of the exhaust duct as possible. According to one embodiment, said limited amount of reducing agent is distributed over as large an area of an evaporator module of the exhaust duct as possible.
    According to the method of the invention, it is possible to distribute and store dosed reducing agent within a fairly wide temperature range with respect to temperature of the exhaust gas treatment system, and is not limited in this way to certain prior art solutions, where ammonia must be stored in the catalyst at temperatures of 200 -350 degrees Celsius.
    According to one embodiment, said limited amount of reducing agent is distributed and stored at a temperature of the exhaust gas treatment system amounting to 100-180 degrees Celsius. According to one embodiment, said limited amount of reducing agent is distributed and stored at a temperature of the exhaust gas treatment system amounting to 100-200 degrees Celsius. According to one embodiment, said limited amount of reducing agent is distributed and stored at a temperature of the exhaust gas treatment system amounting to 120-160 degrees Celsius. According to one embodiment, said limited amount of reducing agent is distributed and stored at a temperature of the exhaust gas treatment system amounting to 140 degrees Celsius.
    The method may comprise the step of: using said distributed and stored reducing agents via a crystal state of said reducing agent. This provides an alternative procedure for increasing the performance of an SCR system.
    The method may comprise the step of: - distributing and storing said limited amount of reducing agent in connection with shutting off said engine. In this case, advantageous thermal energy of said exhaust duct and / or evaporator module can be used according to an aspect of the present invention. Distributing and storing said limited amount of reducing agent in connection with shutting down said engine may result in less ammonia slip than if said limited amount of reducing agent is distributed and stored in connection with starting said engine.
    The method may comprise the step of: - distributing and storing said limited amount of reducing agent in connection with starting of said engine.
    Distributing and storing said limited amount of reducing agent, as according to an embodiment of the present invention, after a shutdown of said engine means that the process can be carried out even if the SCR catalyst is very hot, i.e. if the SCR catalyst has a temperature exceeding one certain limit value, at said shutdown of said motor.
    The method may comprise the step of: - distributing said limited amount of reducing agent to form a reducing agent film in said exhaust duct. This advantageously provides the possibility of converting and conducting said distributed said catalytic devices when heating an exhaust gas purification system at an early stage.
    The method may comprise the step of: - distributing said limited amount of reducing agent by controlling a reducing agent dosing unit. Hereby an accurate and effective method according to the invention is provided, where a spray image of said reducing agent can be influenced in a suitable manner.
    The method may comprise the step of: - distributing said limited amount of reducing agent by controlling a Hereby an accurate and efficient method according to the invention is achieved, wherein valve configuration of said exhaust gas treatment system. a spray image of said reducing agent can be affected in a suitable manner.
    The method may comprise the step of: - using an exhaust stream from said engine to effect said distribution. Hereby a cost- and time-efficient method according to the invention is provided, where a distribution of said reducing agent can be affected in a suitable manner.
    The method may comprise the step of: - using compressed air to achieve said distribution. Hereby an effective method according to the invention is provided, where a distribution of said reducing agent can be affected in a suitable manner.
    The procedure is easy to implement in existing motor vehicles. Program code for an exhaust gas cleaning system for an engine according to the invention can be installed in a control unit of the vehicle during its manufacture. A buyer of the vehicle can thus be given the opportunity to choose the function of the procedure as an option.
    Alternatively, program code including program code for performing the innovative process of an engine exhaust purification system may be installed in a control unit of the vehicle when upgrading at a service station. In this case, the software can be loaded into a memory in the control unit.
    Program code for an exhaust gas cleaning system for an engine can be updated or replaced where appropriate. Furthermore, different parts of the program code in an exhaust gas purification system for an engine can be replaced independently of each other. This modular configuration is advantageous from a maintenance perspective.
    According to one aspect of the present invention, there is provided an apparatus in an exhaust gas purification system for an engine, comprising means adapted to dispense a reducing agent into an exhaust gas duct from said engine for exhaust gas purifying purposes and wherein said exhaust gas purification system includes devices which require a certain temperature level to effect catalytic exhaust purification . The device also comprises: - means adapted to distribute a limited amount of reducing agent in said exhaust duct for temporary storage upstream of said devices at a temperature below said certain temperature level to, at cold start of said exhaust gas purification system, enable use of said distributed and stored reducing agent to provide said catalytic exhaust gas purification.
    In the device, said distributed and stored reducing agents can be used via a crystal state of said reducing agents.
    The device may comprise: - means adapted to determine shutdown of said motor; and - means adapted to distribute said limited amount of reducing agent at a determined shutdown of said engine The device may comprise: - means adapted to determine start of said engine; and - means adapted to dispense said limited amount of reducing agent at a fixed start of said engine.
    The device may comprise: - means adapted to distribute said limited amount of reducing agent to form a reducing agent film in said exhaust duct.
    The device may comprise: - a controllably arranged reducing agent dosing unit adapted to distribute said limited amount of reducing agent through. Said dosing unit may be a compressed air-assisted dosing unit. In this case, a spray image of said dosed limited amount of reducing agent can be influenced in a desired manner in order to achieve a suitable distribution.
    The device may comprise: - a controllably arranged said exhaust gas treatment system, valve configuration of which is adapted to distribute said limited amount of reducing agent.
    The device may be adapted to use an exhaust stream from said engine to effect said distribution.
    The device may comprise: - compressed air means adapted to effect said distribution.
    The above objects are also achieved with a motor vehicle comprising the device of an exhaust gas purification system for an engine. The motor vehicle can be a truck, bus or car.
    According to one aspect of the invention, there is provided a computer program in an exhaust gas purification system for an engine, said computer program comprising program code for causing an electronic control unit or another computer connected to the electronic control unit to perform the steps according to any one of claims 1-9.
    According to one aspect of the invention, there is provided a computer program in an exhaust gas purification system for an engine, said computer program comprising program code stored on a computer readable medium to cause an electronic control unit or another computer connected to the electronic control unit to perform the steps of any of claims 1-9.
    According to one aspect of the invention, there is provided a computer program product comprising a program code stored on a computer readable medium for performing the method steps of any of claims 1-9, when said program code is executed on an electronic control unit or another computer connected to the electronic control unit. . Advantages of the invention will become apparent to those skilled in the art from the following details, as well as additional objects, and novel features of the present invention through the practice of the invention. While the invention is described below, it should be understood that the invention is not limited to the specific details described. Those skilled in the art having access to the teachings herein will recognize and incorporate within other further applications, modifications areas, which are within the scope of the invention. SUMMARY DESCRIPTION OF THE DRAWINGS For a more complete understanding of the present invention and further objects and advantages thereof, reference is now made to the following detailed description which is to be read in conjunction with the accompanying drawings in which like reference numerals refer to like parts in the various figures, and in which: 1 schematically illustrates a vehicle, according to an embodiment of the invention; Figure 2 schematically illustrates an apparatus in an exhaust gas purification system for an engine, according to an embodiment of the invention; Figure 3 schematically illustrates a part of an exhaust gas purification system for an engine, according to an embodiment of the invention; Figure 4a schematically illustrates a flow chart of a method, according to an embodiment of the invention; Figure 4b schematically illustrates in further detail a flow chart of a method, according to an aspect of the invention; and illustrating a computer, Figure 5 schematically according to an embodiment of the invention.
    DETAILED DESCRIPTION OF FIGURES Referring to Figure 1, a side view of a vehicle 100 is shown. The exemplary vehicle 100 consists of a tractor 110 and a trailer 112. The vehicle may be a heavy vehicle, such as a truck or a bus. The vehicle can alternatively be a car. The vehicle can be a truck.
    It should be noted that the invention is suitable for application to any suitable exhaust gas purification system which comprises a catalyst for an SCR catalyst according to an exhaust gas purification system. According to one embodiment, catalytic exhaust gas purification is included. embodiment, said exhaust gas purification system comprises an SCR system. According to one embodiment, said exhaust gas purification system comprises an evaporation module arranged in an exhaust duct upstream of a catalyst arrangement, for example including According to an exhaust gas purification system an evaporating module arranged in an exhaust duct said SCR catalyst. embodiment includes said upstream devices for catalytic exhaust gas purification, for example including said SCR catalyst.
    Aspects of the present invention are described herein with reference to an SCR system. One skilled in the art will recognize that the invention is applicable to other types of exhaust gas purification systems than exhaust gas purification systems including an SCR catalyst. In this case, a reducing agent suitable for the invention with desirable properties is used.
    It should be noted that the invention is suitable for application of a suitable SCR system. Said SCR system may comprise a DOC unit and an SCR system of the process and SCR catalyst and is thus not limited to motor vehicles. The inventive device according to the invention according to an aspect of the invention is well suited for platforms other than an exhaust gas cleaning system other than motor vehicles, such as e.g. watercraft. The watercraft can be of any suitable type, such as e.g. motorboats, ships, ferries or ships. The inventive method and the inventive device, according to an aspect of the invention, are also well suited for e.g. systems including, for example, a stone crusher or the like.
    The inventive method and the inventive device according to an aspect of the invention are also well suited for e.g. systems including industrial engines and / or motorized industrial robots.
    The inventive method and the inventive device according to an aspect of the invention are also well suited for different types of power plants, such as e.g. an electric power plant comprising a diesel-powered electric generator.
    The inventive process and the inventive device are well suited for any suitable engine system which includes an engine and an SCR system and an SCR catalyst, such as e.g. at a locomotive or other platform.
    The inventive method and apparatus of the invention are well suited for a suitable system including a NOX generator and an SCR system including an evaporator module and an SCR catalyst.
    The inventive method and the inventive device are well suited for a suitable system which includes a so-called cDPF device. The inventive device is well suited for a suitable system as the inventive method and it includes a so-called ASC device.
    Here, the term "link" refers to a communication link which may be a physical line, such as an optoelectronic communication line, or a non-physical line, such as a wireless connection, for example a radio or microwave link.
    Here, the term "conduit" refers to a passage for holding and transporting a fluid, such as e.g. a reductant in liquid form. The pipe can be a pipe of any dimension. The conduit may consist of any suitable material, such as e.g. plastic, rubber or metal.
    Here, the terms "reductant" or "reducing agent" refer to an agent used to react with certain emissions in an SCR system. These emissions can e.g. be NOX gas. The terms "reductant" and "reducing agent" are used synonymously herein. Said reductant is according to an embodiment so-called AdBlue. Of course, other types of reductants can be used.
    Here, AdBlue is mentioned as an example of a reductant, but a person skilled in the art realizes that the innovative method and the innovative device can be realized for other types of reductants.
    Said reducing agent may consist of an aqueous solution including urea.
    Said reducing agent may comprise a suitable concentration of urea.
    Said reducing agent may be in liquid form upon dosing. Said reducing agent may be in gaseous form upon dosing. Said reducing agent may be in solid form when dosed. Referring to Figure 2, there is shown a device 299 of the vehicle 100.
    The device 299 may be arranged in the tractor 110. The device 299 may form part of an SCR system or include an SCR system. Figure 2 schematically illustrates a motor 235. Said motor 235 is a suitable motor.
    Said engine 235 is an internal combustion engine. Said engine 235 may be a diesel engine. Alternatively, said engine 235 may be a gasoline, gas, or ethanol powered engine. An exhaust duct 290 is arranged to direct exhaust gases from said engine 235 to an environment thereof. Said exhaust duct 290 may be included in a muffler unit. The device 299 comprises a first control unit 200. Said first control unit 200 is arranged to control operation of said motor 235.
    The device 299 according to this example comprises a container 205 which is arranged to hold a reductant. The container 205 is arranged to contain a suitable amount of reductant and is further arranged to be able to be refilled if necessary.
    A first conduit 271 is provided to direct the reductant to a pump 230 from the container 205. The pump 230 may be any suitable pump. The pump 230 may be a diaphragm pump comprising at least one filter. The pump 230 may be arranged to be operated by means of an electric motor (not shown). The pump 230 is arranged to pump up the reductant from the container 205 via the first line 271 and via a second line 272 supply said reductant to a dosing unit 250. The dosing unit 250 may comprise an electrically controlled dosing device, by means of which a flow of reductant added to the exhaust system can be controlled. . The first control unit 200 is arranged for communication with the dosing unit 250 via a link L250. The pump 230 is 272.
    The dosing unit 250 is provided with a throttling unit, which can also be arranged to pressurize the reductant in the second line is called a throttling valve, against which said pressure of the reductant can be built up in the device 299.
    The dosing unit 250 is arranged to supply said reductant to said exhaust duct 290 of the vehicle 100. More specifically, the dosing unit 250 is arranged to supply in a controlled manner a suitable amount of reductant to said exhaust duct 290 of the vehicle 100, according to an aspect of the inventive method. According to this embodiment, an SCR catalyst 270 is arranged downstream of a position of the exhaust system where supply of the reductant takes place. The amount of reductant added to the exhaust system is intended to be used in the SCR catalyst to reduce the amount of unwanted emissions.
    According to an exemplary embodiment, a diesel oxidation catalyst 259 is presently provided in the exhaust duct 290 downstream of said engine. Said diesel oxidation catalyst 259 is presently arranged in the exhaust duct 290 270 and dosing unit 250. Said diesel oxidation catalyst 259 may be named upstream of said SCR catalyst upstream of said DOC unit. Said diesel oxidation catalyst 259 is arranged so that 235 to diesel oxidation catalyst 259 can also be arranged to oxidize fuel to convert NO gas from said engine NOZ gas. Mentioned to cause an increase in temperature of exhaust gases.
    The exhaust duct 290 comprises an evaporator module 269. Said exhaust duct 290 may comprise a piece of pipe upstream of said evaporator module 269.
    Said evaporator module 269 is arranged upstream of said SCR catalyst 270. Said evaporator module 269 is arranged downstream of said dosing unit 250. Said evaporator module 269 may be designed in a suitable manner. Said evaporation module 269 is arranged to enable efficient evaporation of dosed reducing agent. According to one aspect of the present invention, said evaporator module 269 is arranged to store a limited amount of supplied reducing agent, which at cold start of said SCR system can be used for exhaust gas purification. According to one aspect of the present invention, said exhaust duct 290 is arranged to store a limited amount of supplied reducing agent, which at cold start of said SCR system can be used for exhaust purification. Said supplied limited amount of reducing agent may be stored in the exhaust duct 290 upstream of said evaporator module 269 or in said evaporator module 269.
    The dosing unit 250 is arranged at said exhaust duct 290 which is arranged to direct exhaust gases from said engine 235 of the vehicle 100 to 16 said DOC unit 259, further to said evaporator module 269 and said SCR catalyst 270, and further to an environment of the vehicle.
    A third conduit 273 is presently disposed between the metering unit 250 and the container 205. The third conduit 273 is arranged to return a certain amount of the reductant fed to the metering valve 250 to the container 205.
    The first control unit 200 is arranged for communication with the pump 230 via a link L230. The first control unit 200 is arranged to control operation of the pump 230. According to one example, the first control unit 200 is arranged to control the pump 230 by means of an electric motor (not shown). The first control unit 200 is arranged to influence a working pressure in the second line 272. This can be done in various suitable ways. According to one example, the first control unit 200 is arranged to change a prevailing speed RPM of the pump 230. In this case, the pressure can be changed in a desired manner. By increasing the speed of the pump 230, the working pressure can be increased. By lowering the speed of the pump 230, the working pressure can be reduced. By controlling the pressure of the reductant in the second line 272 by means of the pump 230, a spray image of dosed reducing agent can be influenced and thereby controlled. In this case, a distribution of metered reducing agent in said exhaust duct 290 can be controlled in a suitable manner. In particular, a spray image of said dosed reducing agent of limited amount, according to an aspect of the present invention, can be controlled so as to achieve a desired distribution and storage of said reducing agent.
    By controlling the pressure of the reductant in the second line 272 by means of said throttling unit of the dosing unit 250, a spray image of dosed reducing agent can be influenced and thereby controlled. In this case, a distribution of metered reducing agent in said exhaust duct 290 can be controlled in a suitable manner. Said throttling unit 17 According to one embodiment, the dosing unit 250 is arranged with a controllable nozzle. The first control unit 200 is arranged to control said nozzle. In this case, the said nozzle can be directed in a suitable manner. In this case, a spray image of the dosed reduction medium can be affected and thereby controlled. In this case, a distribution of metered reduction medium in said exhaust duct 290 can be controlled in a suitable manner.
    The first control unit 200 is arranged for communication with a first temperature sensor 240 via a link L240. The temperature sensor 240 is arranged to detect a prevailing temperature Tf of an exhaust stream from the vehicle's engine. According to one example, the first temperature sensor 240 is arranged at said exhaust duct 290 directly downstream of the vehicle engine and upstream of said DOC unit 259 and thereby upstream of said dosing unit 250.
    The first temperature sensor 240 may be provided at a suitable location of said exhaust duct 290. The first temperature sensor 240 is arranged to continuously detect an ambient temperature Tf of the exhaust stream and send signals including information about said ambient temperature Tf via the link L240 to the first control unit 200.
    The first control unit 200 is arranged for communication with a second temperature sensor 260 via a link L260. The second temperature sensor 260 may be arranged to detect an ambient temperature T2 of a surface in the exhaust system where the reducing agent is evaporated. The second temperature sensor 260 may be arranged to detect an ambient temperature T2 of the exhaust duct 290 in a suitable place. The second temperature sensor 260 may be arranged to detect an ambient temperature T2 of a suitable surface or component of the exhaust duct 290.
    According to one example, the second temperature sensor 260 is arranged at the exhaust duct 290 upstream of the dosing unit 250. According to one example, the second temperature sensor 260 is arranged to detect a prevailing temperature T2 of said DOC unit 259. According to an example, the second temperature sensor 260 is arranged in the 290 exhaust duct upstream of the dosing unit 250. According to another, the second temperature sensor 260 is arranged in said extension module 269 or, for example, said SCR catalyst 270 is downstream of the dosing unit 250. The second temperature sensor 260 is arranged to continuously detect an ambient temperature T2 of a surface or component of the exhaust duct 290 and send signals including information about said current temperature T2 via the link L260 to the first control unit 200.
    According to one embodiment, the first control unit 200 and / or the second control unit 210 are arranged to calculate said first temperature T1. This can be done by means of a stored calculation model. The first control unit 200 and / or the second control unit 210 may be arranged to calculate said first temperature T1 on the basis of, for example, a prevailing exhaust gas mass flow, prevailing speed of the engine and prevailing load of the engine.
    According to one embodiment, the first control unit 200 and / or a second control unit 210 is arranged to calculate said second temperature T2. This can be done by means of a stored calculation model. The first control unit 200 and / or the second control unit 210 may be arranged to calculate said second temperature T2 on the basis of, for example, a determined ambient temperature of the vehicle 100. The first control unit 200 and / or the second control unit 210 may be arranged to calculate said second temperature T2 on the basis of, for example, a determined period of time since the engine 235 was switched off, ambient temperature of the vehicle 100, determined accumulated heat dissipation of said engine 235 before shutdown and / or temperature of the engine 235 at shutdown. The first control unit 200 and / or the second control unit 210 may be arranged to calculate said second temperature T2 on the basis of said first temperature T1.
    The first control unit 200 is arranged to, by means of said controllably arranged dosing unit 250, dose and thereby distribute and store a limited amount of reducing agent in said exhaust duct 290 upstream 270 at a predetermined temperature level, for example said SCR catalyst temperature below a Celsius. distributed and stored limited amount of reducing agent can, at cold start 190 degrees This of an exhaust gas purification system including said evaporating module 269 and SCR catalyst 270, be used for exhaust gas purifying purposes.
    The first control unit 200 is arranged to, by means of said dosing unit 250, dose said reducing agent so that said reducing agent according to an aspect of the invention can be used for exhaust gas purifying purposes after first being in solid phase, i.e. in a crystalline state, and then converted to gaseous form. use of said SCR catalyst 270. Said gaseous reducing agent may include ammonia.
    The first control unit 200 may be arranged to, by means of said dosing unit 250, dispense and thereby distribute and store said limited amount of reducing agent in connection with shut-off of said motor 235. The first control unit 200 may be arranged to, by means of said dosing unit 250, dispense and thereby distributing and storing said limited amount of reducing agent in connection with the start of said engine 235. The first control unit 200 may be arranged to, by means of said dosing unit 250, distribute said limited amount of reducing agent to form at least one reducing agent film in said exhaust duct 290 and / or extension module 269. The first control unit 200 may be arranged to control said dosing unit 270 to dose said limited amount of reducing agent according to an aspect of the invention so that a suitable layer of reducing agent according to the invention is formed in the exhaust duct 290 and / or the evaporator module 269. The first control unit 200 may be arranged to control e n valve configuration of the SCR system to provide a suitable operating pressure of said reducing agent, wherein reducing agent appropriate distribution of said limited amount is provided in said exhaust gas treatment system. The first control unit 200 may be arranged to dispense and thereby distribute and store said limited amount of reducing agent by, when shutting off said engine 235, using an exhaust stream from said engine 235 to effect said distribution. The first control unit 200 may be arranged, during said distribution and storage, to control compressed air means in order to provide a layer of reducing agent suitable according to the invention in said exhaust duct 290 and / or said evaporating module 269.
    The first control unit 200 is arranged for communication with the dosing unit 250 via a link L250. The first control unit 200 is arranged to control the operation of the dosing unit 250 in order to e.g. control the supply of the reductant to the exhaust system of the vehicle 100. calculate a The first control unit 200 may be arranged to exhaust gas mass flow l / IF of the exhaust gases from the engine of the vehicle. The first determines an exhaust mass flow MF of the exhaust gases from the vehicle's engine. This can be done on the control unit 200 can be arranged to continuously in a suitable manner. According to an example, the first control unit 200 may be arranged to, by means of said dosing unit 250, distribute said limited amount of reducing agent to the exhaust duct 290 on the basis of said determined exhaust gas mass flow I / IF. Said exhaust gas flow when shutting off said engine 235 can be used to provide a suitable distribution of said metered limited amount of reducing agent in said exhaust duct and / or said evaporator module 269. According to the invention according to the invention the intention is not to store reducing agent in the form of said ammonia in said SCR Catalyst 270.
    According to one embodiment, the subsystem comprises a mass flow sensor (not shown) which is arranged to continuously measure a prevailing exhaust mass flow I / IF from the engine of the vehicle 100 in the exhaust duct 290 upstream of said SCR catalyst 270. Said mass flow sensor is arranged to continuously transmit information. about a prevailing exhaust mass flow l / IF to the first control unit 200 via a dedicated link.
    The second control unit 210 is arranged for communication with the first control unit 200 via a link L210. The second control unit 210 may be releasably connected to the first control unit 200. The second control unit 210 may be a control unit external to the vehicle 100. The second control unit 210 may be arranged to perform the inventive method steps.
    The second control unit 210 can be used to upload program code to the first control unit 200, in particular program code for performing the inventive method. The second control unit 210 may alternatively be arranged for communication with the first control unit 200 via an internal network in the vehicle. The second control unit 210 may be arranged to perform substantially the same functions as the first control unit 200, such as e.g. supplying and thereby distributing and storing a limited amount of reducing agent in said exhaust duct 290 upstream of said SCR-270 at a temperature level Tmax, and at cold start of said exhaust gas purification system, catalyst temperature below said certain used said distributed and stored reducing agents to effect said catalytic exhaust gas.
    In one embodiment, more than one dosage unit 250 may be provided. The first control unit 200 is then arranged to control these additional dosing units in a manner corresponding to the dosing unit 250. In case more than one dosing unit 250 is used according to the inventive method, they can cooperate to achieve a substantially optimal distribution and storage of said limited amount of added reducing agent. . 200 are different dosing units so that dosing of said limited amount The first control unit arranged to control the reducing agents takes place sequentially, alternately or simultaneously, or a combination thereof. The total amount of said limited amount of reducing agent to be distributed and stored according to the present invention 22 can be distributed between the different dosage units in a suitable manner. According to an exemplary embodiment, where the device 299 comprises two dosing units 250, the respective dosing units 250 can dose half of said limited amount of reducing agent each. According to an exemplary embodiment, where the device 299 comprises two dosing units 250, the respective% of said dosing units 250 can dose 90% and a limited amount of reducing agent, respectively.
    According to an exemplary embodiment, compressed air means 289. The first control unit 200 is then arranged for communication with said compressed air means 289 via a link L289. The first control unit 200 is arranged to control said compressed air means 289. Said compressed air means 289 is arranged to supply an air stream of said exhaust duct 290 to provide a suitable distribution and storage of said limited amount of reducing agent of said exhaust duct 290 and / or said evaporator module 269. compressed air means Figure 3. Said compressed air means 289 can advantageously also be described with reference to be used for said distribution of said limited amount of reducing means when said engine 235 is switched off. Said compressed air means 289 can be advantageously used for said distribution of said limited reducing agent when said amount of reducing agent is dosed according to the present invention.
    Figure 3 schematically illustrates a part of an exhaust gas purification system for an engine 235, according to an embodiment of the invention.
    In this case said evaporator module 269 and said SCR catalyst 270. Further illustrated are said exhaust duct 290 including said dosing unit 250, the second line 272 and the third line 273. Said compressed air means 289 is arranged to control the first L289 on the basis of control signals received from the link L289. supply compressed air to the exhaust duct 290 in a suitable manner. In this case, a suitable distribution of said limited amount of reducing agent can be achieved according to an aspect of the present invention. It should be noted that said compressed air means may alternatively be arranged to supply any suitable gas to the exhaust duct 290, not necessarily air.
    According to one aspect of the present invention, a limited amount of reducing agent is metered and stored and stored at a temperature of the exhaust duct 290 which is below a predetermined temperature Tmax.
    Said distributed reducing agent here constitutes one or more thin films F of walls of said exhaust duct 290 or in the evaporator module 269.
    Said film F can also be called layer / coating / layer. According to one embodiment, said film F can be thinner than 1 mm, for example 0, 1 mm or 0.5 mm. Said film F can according to one embodiment be thicker than 1 mm. Said film F may comprise portions where no reducing agent is present. Said film F may thus comprise one or more heels. Said film F is advantageously distributed in such a way that reducing agents can be released quickly in the event of temperature rises during cold start of the SCR system. In this case, said reducing agent, in a suitable composition (for example ammonia), can be passed to said SCR catalyst 270 for exhaust gas purification.
    Said film F can at least partly consist of reducing agent in liquid phase.
    Said film F may at least partly consist of reducing agent in solid phase, for example in the form of reducing agent crystals.
    According to an exemplary embodiment, distribution means 333 may be provided. These distribution means 333 can be designed in a suitable manner, for example as a net or propeller. Said distributing means 333 are arranged to distribute Hereby an effective means is provided for optimizing distribution of said limited amount of reducing agent in a suitable manner. limited amount of reducing agent in said exhaust duct 290 and / or narrowing module 269. Said distributing means 333 are arranged downstream of said dosing unit 250. Said distributing means 333 are arranged to atomize and disperse said metered limited amount of reducing agent in distributing and storing the same in said exhaust gas and / or extension module 269.
    Figure 4a schematically illustrates a flow chart of a process in an exhaust gas purification system for an engine 235 where a reducing agent is supplied to a duct 290 for exhaust gases from said engine 235 for exhaust purifying purposes and where said exhaust purification system includes devices 270 which require a certain temperature level Tmax to provide catalytic purification . The method comprises a first method step s401. Step s401 includes the steps of: - distributing and storing a limited amount of reducing agent in said exhaust duct 290 upstream of said devices 270 at a temperature below said certain temperature level Tmax; and - in the cold start of said exhaust gas purification system, using said distributed and stored reducing agents to effect said catalytic exhaust gas purification.
    After step s401, the process is terminated.
    Figure 4b schematically illustrates a flow chart of a process in an exhaust gas purification system for an engine 235 where a reducing agent is supplied to an exhaust duct 290 from said engine 235 for exhaust purifying purposes and wherein said exhaust purification system includes devices 270 which require a certain temperature level Tmax to provide catalytic purification , according to one aspect of the present invention.
    The method includes a first method step s410. Process step s410 includes the step of determining a prevailing second temperature T2 of the exhaust duct 290. This may involve determining a second temperature T2 DOC unit 259, the SCR catalyst 270, the evaporator module 269 or a wall of the exhaust duct 290. The method of comprising the step may include. determining said first temperature T1. Said second temperature T2 can be determined on the basis of said first temperature T1 of exhaust gases from said engine 235. In case said second temperature T2 falls below a predetermined temperature value Tmax, for example 180 or 200 degrees Celsius, the inventive process can be performed. After the process step s410, a subsequent process step s420 is performed.
    Method step s420 includes the step of determining a distribution of a limited amount of reducing agent. The step s42O may include the step of determining an amount or volume of reducing agent which is to correspond to said limited amount of reducing agent. Said volume may, according to an example, be 0.1 liter, or 0.05 liter. Said limited amount of reducing agent is a suitable amount of reducing agent. Said limited amount of reducing agent may be, for example, 30, 100 or 600 grams of Adblue.
    Distribution of said limited amount of reducing agent is adapted according to the inventive process so as not to cause excessive formation in the 290 narrowing module 269. Said limited amount of reducing agent may be reducing crystals of the exhaust duct or in an amount based on, and / or related to, a maximum possible storage of ammonia in an SCR catalyst. An SCR catalyst can have a certain maximum possible storage capacity (how much ammonia the SCR catalyst can "pour" at a certain temperature) which is x grams per unit volume, for example x grams of ammonia per liter. In this case, the maximum possible storage depends on the size / volume of the said SCR catalyst stated in the quantity "liters". The maximum possible storage of said SCR catalyst may also depend on, and or be specified in, some other applicable quantity. The maximum possible storage of ammonia in an SCR catalyst can be 0.5 grams / liter. The maximum possible storage of ammonia in an SCR catalyst can be 0.8 grams / liter. The maximum possible storage of ammonia in an SCR catalyst can be 2 grams / liter. As will be appreciated, the maximum possible storage of ammonia may be less than 0.5 grams / liter or greater than 2 grams / liter. Said limited amount of reducing agent may be an amount of the same order of magnitude as a maximum possible storage of 26 ammonia in an SCR catalyst. Said reducing agent may be an amount less than, or equal to, a limited amount of maximum possible storage of ammonia in said SCR catalyst. Said limited amount of reducing medium may be an amount greater than, or equal to, a maximum possible storage of ammonia in said SCR catalyst. Said limited amount of reducing medium may be an amount less than, or equal to 50% of, a maximum possible storage of ammonia in said SCR catalyst. Said limited amount of reducing agent may be an amount less than, or equal to 25% of, a maximum possible storage of ammonia in said SCR catalyst.
    Said limited amount of reducing agent may be an amount corresponding to / resulting in 50 grams of ammonia which reacts with NOX gas in said SCR catalyst. Said limited amount of reducing agent may be an amount corresponding to / resulting in 25 grams of ammonia which reacts with NOX gas in said SCR catalyst. Said limited amount of reducing agent may be an amount corresponding to / resulting in 8 grams of ammonia which reacts with NOX gas in said SCR catalyst. Said limited amount of reducing agent may be an amount corresponding to / resulting in 2.5 grams of ammonia which reacts with NOX gas in said SCR catalyst. Said limited amount of reducing medium may be an amount which, upon a subsequent temperature increase, results in an ammonia slip ("ammonia slip") from said SCR catalyst which is below a predetermined limit value. Said limited amount of reducing medium may be one at an amount which, subsequently temperature rise, results in an ammonia slip from said SCR catalyst which, after passing an ASC (Ammonia Slip Catalyst, "below ammonia slip catalyst") is less than a predetermined limit.
    Said limit value may be substantially equal to zero. Said limit value may be an applicable predetermined value. Said limit value may be an applicable predetermined value which is based on a current legal requirement. Said resulting ammonia slip may be an estimated / predicted result. Said resulting ammonia slip. am moniak-slip 27 can be estimated / predicted / calculated using an applicable calculation model. Said limited amount of reducing agent may be an amount corresponding to / resulting in an amount of reducing agent crystals formed in the exhaust duct 290 or in the evaporator module 269 being less than a predetermined maximum amount of reducing agent crystals. Said amount of reducing agent crystals may correspond to the above-mentioned amount of ammonia which reacts with NOX gas in said SCR catalyst. Said limited amount of reducing agent may be an amount based on properties, such as, for example, possible storage capacity, of said SCR catalyst at cold start. Said limited amount of reducing agent may be an amount based on the properties of said SCR catalyst in a process following cold start.
    According to one aspect of the invention, said limited amount of reducing agent shall only be temporarily distributed and stored in the exhaust duct 290 before use at a cold start of the SCR system, i.e. said limited amount of reducing agent shall not be permanently stored in the exhaust duct 290.
    Said temporarily stored limited amount of reducing agent is to be consumed according to the method of the invention. Said temporarily stored limited amount of reducing agent / ammonia is intended to react with NOX gas in said SCR catalyst and is converted to nitrogen gas and water.
    Step s42O also includes the step of determining the appropriate manner of dispensing said limited amount of reducing agent after dosing. In this case, a duration configuration for said dosage can be determined. Said duration configuration may, for example, refer to a period of time when said dosing unit is open and dosing of reducing agent takes place. In this case, it can be determined whether said compressed air means 289 is to be used for said distribution. In this case, it can be determined whether an exhaust gas flow from said engine 235 is to be used for said distribution. In this case, it can be determined whether more than one dosing unit 250 is to be used. In this case, it can be determined how a suitable spray image for said dosage should be designed.
    After the process step s420, a subsequent process step s430 is performed.
    The method step s430 comprises the step of distributing and storing said limited amount of reducing medium in said determined suitable manner.
    This can be done in various suitable ways. After the process step s440, a subsequent process step s440 is performed.
    Process step s440 includes the step of using said limited amount of distributed and stored reducing agent for exhaust gas purification in said SCR catalyst 270. As said second temperature T2 gradually increases in SCR systems, reducing agent is gradually released in the form of, for example, ammonia and heating said stored means. According to an alternative embodiment, said stored reduction medium can be successively discharged in the form of, for example, gaseous ammonia and by means of an air stream caused by said compressed air means is led to said SCR catalyst 270, possibly in combination with said exhaust stream from said engine 235.
    According to the invention, the entire limited amount of distributed and stored reduction medium which has temporarily been present in said exhaust duct 290 and / or evaporator module 269. The process step s440 is terminated and the inventive process is terminated. Referring to Figure 5, there is shown a diagram of an embodiment of a device 500. The controllers 200 and 210 described with reference to Figure 2 may in one embodiment include the device 500. The device 500 includes a non-volatile memory 520, a data processing unit 510 and a read / write memory 550. The non-volatile memory 520 has a first memory portion 530 in which a computer program, such as an operating system, is stored to control the operation of the device 500. Further, the device 500 includes a bus controller, a serial communication port, I / O means, an A / D converter, a time and date input and transfer unit, an event counter and 29 an interrupt controller (not shown). The non-volatile memory 520 also has a second memory portion 540.
    A computer program P is provided which includes routines in an exhaust gas purification system for an engine 235 where a reducing agent is supplied to an exhaust duct 290 from said engine 235 for exhaust purifying purposes and wherein said exhaust purification system includes devices 270 which require a certain temperature level Tmax to effect catalytic exhaust purification.
    The computer program P may comprise routines for dosing a limited amount of reducing agent and thereby distributing and storing said limited amount of reducing agent in said exhaust duct 290 and / or an evaporating module arranged in said exhaust duct upstream of said SCR catalyst 270 at a temperature below said certain temperature level. , in the cold start of said exhaust purification system, provide and use said distributed and stored reducing agents to effect said catalytic exhaust purification. The computer program P may include routines for allocating and storing said limited amount of reducing agent in connection with shutting down said engine 235. The computer program P may include routines for allocating and storing said limited amount of reducing agent in connection with starting said engine 235. The computer program P may include routines for distributing said limited amount of reducing agent to form a reducing agent film F in said exhaust duct 290 and / or evaporator module 269. The computer program P may include routines for distributing said limited amount of reducing agent by controlling a reducing agent dosing unit 250. The computer program P may include routines. distributing said limited amount of reducing agent by controlling a valve configuration (not shown) of said exhaust gas treatment system. The computer program P may include routines for controlling operation of said engine 235 and thereby using an exhaust stream from said engine 235 to effect said distribution. The computer program P may include routines for controlling compressed air means 289 and using compressed air supplied in said exhaust duct 290 to effect said distribution.
    The program P can be stored in an executable manner or in a compressed manner in a memory 560 and / or in a read / write memory 550.
    When it is described that the data processing unit 510 performs a certain function, it should be understood that the data processing unit 510 performs a certain part of the program which is stored in the memory 560, or a certain part of the program which is stored in the read / write memory 550.
    The data processing device 510 can communicate with a data port 599 via a data bus 515. The non-volatile memory 520 is intended for communication with the data processing unit 510 via a data bus 512. The separate memory 560 is intended to communicate with the data processing unit 510 via a data bus 511. the data processing unit 510 via a data bus 514. To the data port 599, e.g. the links L210, L230, L240, L250, L260 and L289 are connected (see Figure 2 and Figure 3).
    The read / write memory 550 is arranged to communicate with When data is received on the data port 599 it is temporarily stored in the second memory part 540. When the received input data has been temporarily stored, the data processing unit 510 is prepared to perform code execution in a manner described above.
    According to one embodiment, signals received at the data port 599 include information about a current temperature T2 of a suitable surface of or component i of the exhaust duct 290, for example a current temperature T2 of the SCR catalyst 270 and / or a temperature T2 of the DOC unit 259. The received signals on the data port 599 can be used by the device 500 to dose and thereby distribute and store a limited amount of reducing agent in said exhaust duct upstream of said SCR catalyst at a temperature below said certain temperature level Tmax. In this case, said distributed and stored reducing agent can be used in cold start of said exhaust gas purification system.
    Parts of the methods described herein may be performed by the device 500 by means of the data processing unit 510 running the program stored in the memory 560 or the read / write memory 550. When the device 500 runs the program, the methods described herein are executed.
    The foregoing description of the preferred embodiments of the present invention has been provided for the purpose of illustrating and describing the invention. It is not intended to be exhaustive or to limit the invention to the variations described. Obviously, many modifications and variations will occur to those skilled in the art. The embodiments were selected and described to best explain the principles of the invention and its practical applications, thereby enabling those skilled in the art to understand the invention for various embodiments and with the various modifications appropriate to the intended use.
    权利要求:
    Claims (20)
    [1]
    A method of an exhaust gas purification system for an engine (235) wherein a reducing agent is supplied to a duct (290) for exhaust gases from said engine (235) for exhaust gas purifying purposes and wherein said exhaust gas purification system includes devices (270) which require a certain temperature level (Tmax) for to provide catalytic exhaust gas purification, characterized by the steps of: - distributing and storing (s430) a limited amount of reducing agent in said exhaust duct (290; 269) upstream of said devices (270) at a temperature below said certain temperature level (Tmax); and - in the cold start of said exhaust gas purification system, use (s440) said distributed and stored reducing agents to effect said catalytic exhaust gas purification.
    [2]
    A method according to claim 1, comprising the step of: - using (s440) said distributed and stored reducing agent via a crystal state of said reducing agent.
    [3]
    A method according to claim 1 or 2, comprising the step of: - distributing and storing (s430) said limited amount of reducing agent in connection with shutting off said engine (235).
    [4]
    A method according to any one of the preceding claims, comprising the step of: - distributing and storing (s430) said limited amount of reducing agent in connection with starting of said engine (235).
    [5]
    A method according to any one of the preceding claims, comprising the step of: - distributing (s430) said limited amount of reducing agent to form a reducing agent film (F) in said exhaust duct (290; 269).
    [6]
    A method according to any one of the preceding claims, comprising the step of: - distributing (s430) said limited amount of reducing agent by controlling a reducing agent dosing unit (250).
    [7]
    A method according to any one of the preceding claims, comprising the step of: - distributing (s430) said limited amount of reducing agent by controlling a valve configuration of said exhaust gas treatment system.
    [8]
    A method according to any one of the preceding claims, comprising the step of: - using (s430) an exhaust gas stream from said engine (235) to effect said distribution.
    [9]
    A method according to any one of the preceding claims, comprising the step of: - using (s430) compressed air to achieve said distribution.
    [10]
    An apparatus for an exhaust gas purification system for an engine (235), comprising means (250) adapted to dispense a reducing agent into a duct (290) for exhaust gases from said engine (235) for exhaust gas purifying purposes and wherein said exhaust gas purification system includes devices (270) which requires a certain temperature level (Tmax) to provide catalytic exhaust gas purification, characterized by: means (200; 210; 500; 250; 333; 289) adapted to distribute a limited amount of reducing agent in said exhaust duct (290; 269) for temporary storage upstream said devices (270) at a temperature below said certain temperature level (Tmax) in order, upon cold start of said exhaust gas purification system, to enable the use of said distributed and reducing means to effect stored said catalytic exhaust gas purification.
    [11]
    Device according to claim 10, comprising: - means (200; 210; 500) adapted to determine shutdown of said motor; Means (200; 210; 500; 250; 333; 289) adapted to dispense said limited amount of reducing agent at a fixed shutdown of said engine (235).
    [12]
    Device according to any one of claims 10 or 11, comprising: - means (200; 210; 500) adapted to determine the start of said engine; means (200; 210; 500; 250; 333; 289) adapted to dispense said limited amount of reducing agent at a fixed start of said engine.
    [13]
    An apparatus according to any one of claims 10 to 12, comprising: - means (200; 210; 500; 250; 333; 289) adapted to distribute said limited amount of reducing agent to form a reducing agent film (F) in said exhaust duct (290; 269 ).
    [14]
    Device according to any one of claims 10-13, comprising: - a controllably arranged reducing agent dosing unit (250) adapted to distribute said limited amount of reducing agent.
    [15]
    Device according to any one of claims 10-14, comprising: controllable exhaust gas treatment system, - an arranged valve configuration of said which is adapted to distribute said limited amount of reducing agent.
    [16]
    Device according to any one of claims 10-15, comprising: - compressed air means (289) adapted to achieve said distribution.
    [17]
    A 1 / lotor vehicle (100; 110) comprising a device according to any one of claims 10-16.
    [18]
    A lor / vehicle (100; 110) according to claim 17, wherein the motor vehicle is any of a truck, bus or passenger car. 10 35
    [19]
    A computer program (P) in an exhaust gas purification system for an engine, said computer program (P) comprising program code for causing an electronic control unit (200; 500) or another computer (210; 500) connected to the electronic control unit (200; 500) ) to perform the steps according to any one of claims 1-9.
    [20]
    A computer program product comprising a program code stored on a computer readable medium for performing the method steps of any of claims 1-9, when said program code is run on an electronic control unit (200; 500) or another computer (210; 500) connected to the electronic control unit (200; 500).
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1350616|2013-05-21|
    SE1450606A|SE538544C2|2013-05-21|2014-05-21|Device and method of an exhaust gas cleaning system for an engine|SE1450606A| SE538544C2|2013-05-21|2014-05-21|Device and method of an exhaust gas cleaning system for an engine|
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