• 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:
    In a method of controlling a supercharging system with a plurality of turbine wheels (20, 21), each of which is arranged in an exhaust line (16, 17) from other cylinders of an internal combustion engine (2) than the cylinders in whose exhaust lines the the other turbine wheels are arranged, the turbine wheels being arranged to drive each compressor wheel (22, 23) arranged in an air intake line to the internal combustion engine, a value of the speed of each turbine wheel is produced and the speed of each turbine wheel is then regulated by influencing cylinders whose exhaust line is connected to the turbine wheel (Fig. 1).
    公开号:SE1450504A1
    申请号:SE1450504
    申请日:2014-04-29
    公开日:2015-10-30
    发明作者:Svante Lejon
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    With a mentioned supercharging system with several turbine wheels, it is usually desirable to distribute the workload evenly over the turbine wheels and the compressors with compressor wheels that belong to the respective turbine wheels. Namely, if the turbine wheels cannot be harmonized to equivalent operating speeds, then properties such as torque and power of the internal combustion engine must be lacking. It is for this reason that in the method according to the above, a value of the speed of each turbine wheel is obtained and the speed of the turbine wheels is regulated depending on the appearance of the produced speed value. To produce a value for speed is here to be interpreted very broadly.
    The production can then take place by direct measurement of speed on the blade of the wheel in question by, for example, an electric sensor reading the passage of a mechanical element or by indirect measurement via reading of pressure, temperature and / or flow of the gases passing the wheels . The definition here also includes a definition of a speed by means of statically built-in deviations of the internal combustion engine parts associated with different exhaust lines.
    BACKGROUND ART In prior art methods of initially defined kind, the speed of the turbine wheels is regulated by regulating the flow of exhaust gases, such as by throttles (throttles or by-pass flows), to respective turbine wheels and / or by controlling the operation of the turbine wheel, such as by performing the turbine wheel. variable geometry (VGT = Variable Geometry Turbine) and vary the geometry of the turbine wheel.
    A disadvantage of this way of regulating said speed is that the components used for this control become relatively expensive, especially if the internal combustion engine in question is to be used in marine applications where the classification requirements regarding surface temperatures imposed on these components may entail requirements for a costly encapsulation of the components.
    SUMMARY OF THE INVENTION The object of the present invention is to provide a method and a system of the kind discussed above, which are improved in at least some respect over previously known such methods and systems.
    This object is achieved according to the invention with regard to the method by providing one with the features listed in the characterizing part of claim 1.
    By performing the control of the speed of each turbine wheel by influencing the injection of fuel into the cylinders whose exhaust line is connected to the turbine wheel, no further components are needed to provide the possibility to separately control the speed of each turbine wheel, so that one of Significant cost savings can be made in relation to the requirements that previously known methods place on components in order to be able to separately control the speed of the various turbine wheels. As mentioned above, this is of particularly great advantage in cases where the internal combustion engine in question is to be arranged where there are strict classification requirements with regard to surface temperatures of parts included therein.
    According to an embodiment of the invention, the method comprises the step of comparing said produced values for speeds of the turbine wheels with setpoints for these, and influencing said injection of fuel into the cylinders on the basis of the result of this comparison.
    According to another embodiment of the invention, the injection of fuel into the cylinders associated with the respective turbine wheels is actuated to regulate the speed of the turbine wheel towards a setpoint in the form of an optimum operating speed for the compressor wheel connected to the turbine wheel. In this case, it does not necessarily have to be the same speed at which the different turbine wheels are regulated, but it could also be the case that there is a built-in fault in the internal combustion engine, so-called engine deviation, for which it is compensated by the regulation.
    According to another embodiment of the invention, the injection of fuel into the cylinders associated with the respective turbine wheels is actuated to regulate the speed of the turbine wheel against a working speed of the associated compressor wheels located at a predetermined distance from or within a predetermined distance wheel range pump from compressor limit pump. . In the absence of separate control of the respective turbine wheel speed, it is normally necessary to have a speed of the compressor wheels which is at least 20% lower than the speed of the compressor wheel pump limit, ie the speed at which the compressor wheel starts pumping back gases in the wrong direction . By instead regulating the speed of the individual turbine wheels separately, it becomes possible to get closer to the said pump limit with a sufficient margin for unusual operating cases. An advantage of the pump limit mentioned is that you can then achieve the combination without pumping. with getting close to high power at high speeds and high torque at lower speeds of the internal combustion engine, as the supercharging system does not need to be dimensioned with the same margin against pumping, but can be dimensioned with more focus on the engine's maximum power.
    According to another embodiment of the invention, the injection of fuel into the cylinders is influenced to balance the working load / speed of the various turbine wheels with each other. In this case, the effect of injecting fuel into the cylinders can take place to regulate the speed of the turbine wheels towards one and the same value, which makes it possible to get close to the said pump limit, and / or closer to the maximum permitted turbine speed for all turbines included in the system.
    According to another embodiment of the invention, the control of the speed of each turbine wheel is performed by controlling the amount of fuel injected into cylinders associated with the turbine wheel. For example, the amount of fuel injected into the cylinders associated with the slowest turbine wheel can be increased to increase the speed of the turbine wheel.
    According to another embodiment of the invention, the method comprises controlling the speed of the respective turbine wheels by controlling an execution of post-injections of fuel in cylinders associated with the turbine wheel, i.e. injection of fuel after the combustion which has taken place in the respective cylinder for the purpose of influencing the cylinder. piston, to influence the pressure of the exhaust pulses and the temperature of the exhaust gases from the cylinder. This constitutes another simple way of achieving the said regulation by influencing fuel injection.
    According to another embodiment of the invention, the method comprises regulating the speed of the respective turbine wheels by regulating the times for injecting fuel into the cylinders associated with the turbine wheel. This approach is called in everyday speech to perform phasing, as by moving the position of the injections of different cylinders, uneven intervals are created between the exhaust pulses coming from these. For example, injection could take place in one cylinder at a crankshaft angle of 8 ° and in another at a crankshaft angle of 12 ° in order to influence the appearance of the exhaust pulses.
    The above-mentioned purpose is achieved with regard to the system by providing a system in accordance with the attached independent system patent requirements. The function of such a system and the advantages of its design appear from the discussion above of the various embodiments of the method according to the invention.
    The invention also relates to a computer program having the features listed in claim 12, a computer software product having the features listed in claim 13, an electronic control unit having the features listed in claim 14 and a motor vehicle according to claims 15 and 16.
    Other advantageous features and advantages of the invention will become apparent from the following description.
    BRIEF DESCRIPTION OF THE DRAWINGS Embodiments of the invention are described below by way of example with reference to the accompanying drawings, in which: Fig. 1 is an schematic view illustrating a supercharging system of an internal combustion engine according to a system for controlling an embodiment of the invention, Fig. 2 embodiment of invention, and is a flow chart showing a method according to a Fig. 3 implementation of a method according to the invention. is a schematic diagram of an electronic control unit for DETAILED DESCRIPTION OF AN EMBODIMENT OF THE INVENTION The invention will be described in the following in the application of a motor vehicle 1. However, the invention is not limited to this application. The motor vehicle has an internal combustion engine 2, which here has two cylinder groups 3, 4 with four cylinders 5-12 each. Air is supplied to the cylinders of the internal combustion engine via an air intake line 13 which at the air intake end itself is divided into two sections 14, 15. Exhaust gases are led away from the internal combustion engine via an exhaust line 16, 17 connected to each group of cylinders.
    The vehicle's electronic control unit 18 is schematically indicated, and this is designed to control, among other things, the fuel injection in the engine cylinders, which is indicated by arrows to the injection nozzles 19 shown in diagrammatically.
    The internal combustion engine is provided with a turbocharger with two turbine wheels 20, 21, which are arranged in each of the exhaust lines 16, 17 from the two cylinder groups 3, 4. The turbine wheels are arranged to drive each, in each section 14, 15 of the air intake line 13 arranged compressor wheels 22, 23 to generate a desired charge pressure of the air which is supplied in the exhaust line section 24 downstream of the compressor wheels 22, 23 to the cylinders of the internal combustion engine.
    Means 25, 26 are arranged to measure the speed of the respective turbine wheels and send information thereon to the electronic control unit 18. This unit 18 is designed to process this information and then give a schematically indicated device 27 orders to regulate the speed of the respective turbine wheels 20, 21 by influencing the injection of fuel into the cylinders whose exhaust line 16, 17 is connected to the turbine wheel in question. Such an effect of the injection of fuel can take place, for example, by varying the amount of fuel injected, so that for example more fuel is injected into cylinders associated with a turbine wheel which has a lower speed than the other turbine wheel and thus the pulse content appearance of the exhaust flow in that exhaust line. is changed so that the speed of the turbine wheel is increased. Another possibility is to perform post-injections of fuel into the cylinders associated with a turbine wheel in order to increase the speed of the turbine wheel. It is also possible to vary the crankshaft angle at which fuel is injected into the various cylinders, so that the injection takes place, for example, at an angle of 8 ° in one cylinder and 12 ° in another, in order to influence the appearance of the exhaust pulses coming from the cylinders. However, the invention is not limited to these ways of influencing the injection of fuel into the cylinders but covers every possible such influence.
    Because the device can in this way regulate the speed of each turbine wheel separately from the control of the speed of the other turbine wheel, it can for instance be ensured that the speed of the turbine wheels is always the same, if this is desired, which means an opportunity to drive the compressor wheels very close to their pumping limit without risk of pumping occurring. This achieves a combination of a high power at high speeds and a good torque at lower speeds of the compressor wheels. However, it is also conceivable that for some reason the pumping limit is not the same for the different compressor parts and it is desired to have a certain distance between the speeds of the two compressor wheels. The desire to compensate for an existing engine deviation can also be a reason to steer the turbine wheels and thus the compressor wheels to different speeds, or the same speed if it improves the engine properties, and there is a built-in static engine deviation, so it is not absolutely necessary to measure turbines. the speed of the injections, without the nature of the injections can be adjusted against expected static differences. Fig. 2 shows a flow chart illustrating an embodiment of a method according to the present invention for controlling a turbocharger of the type described above. In a first step S1, the speed of each turbine wheel is measured. Then, in a second step S2, the measured speeds are compared with each other, whereupon in a third step S3 the fuel injection in the cylinders is regulated against the same speed of the turbine wheels. As stated above, in a method according to the invention said control can take place with a number of other goals than this.
    Computer program code for implementing a method according to the invention is suitably included in a computer program which can be read into the internal memory of a computer, such as the internal memory of an electronic control unit of an internal combustion engine. Such a computer program is suitably provided via a computer program product comprising a data storage medium which can be read by an electronic control unit, which data storage medium has the computer program stored thereon. Said data storage medium is, for example, an optical data storage medium in the form of a CD-ROM, a DVD disc, etc., a magnetic data storage medium in the form of a hard disk, a floppy disk, a cassette tape, etc., or a flash memory or a memory of type ROl / I, PROM, EPROM or EEPROl / l.
    Fig. 3 very schematically illustrates an electronic control unit 18 comprising an execution means 30, such as a central processing unit (CPU), for executing computer software. The execution means 30 communicates with a memory 31, for example of the RAM type, via a data bus 32. The control unit 18 also comprises data storage medium 33, for example in the form of a Flash memory or a memory of the type ROM, PROM, EPROM or EEPROM. The execution means 30 communicates with the data storage medium 33 via the data bus 32. A computer program comprising computer program code for implementing a method according to the invention is stored on the data storage medium 33.
    The invention is of course not in any way limited to the embodiments described above, but a number of possibilities for modifications thereof should be obvious to a person skilled in the art without departing from the scope of the invention as defined in the appended claims.
    The number of turbine wheels and compressor wheels driven therefrom may be different, i.e. larger, than shown.
    权利要求:
    Claims (16)
    [1]
    Method for controlling a supercharging system with a plurality of turbine wheels (20, 21), each of which is arranged in an exhaust line (16, 17) from other cylinders of an internal combustion engine (2) than the cylinders in whose exhaust lines the other turbine wheel (20, 21) are arranged, the turbine wheels being arranged to drive each compressor wheel (22, 23) arranged in an air intake line (13) to the internal combustion engine, the method comprising the steps of determining a value of the speed of the respective turbine wheels and to regulate the speed of the turbine wheels (20, 21) in dependence on said determined speed value, characterized in that the regulation of the speed of the respective turbine wheels (20, 21) takes place by influencing the injection of fuel in the cylinders (5-12) whose exhaust line (16, 17) are connected to the turbine wheel.
    [2]
    Method according to claim 1, characterized in that it comprises the step of comparing said produced values for speed of the turbine wheels (20, 21) with setpoints for these, and influencing said injection of fuel into the cylinders (5-12) on based on the results of this comparison.
    [3]
    Method according to claim 2, characterized in that the injection of fuel into the cylinders (5-12) associated with the respective turbine wheels (20, 21) is actuated to regulate the speed of the turbine wheel against a setpoint in the form of a optimum operating speed of the compressor wheel (22, 23) connected to the turbine wheel. 10 15 20 25 13
    [4]
    Method according to claim 2, characterized in that the injection of fuel into the cylinders (5-12) associated with the respective turbine wheels (20, 21) is actuated to regulate the speed of the turbine wheel against a working speed of the associated compressor wheels ( 22, 23) located at a predetermined distance from the speed of or within a predetermined distance range from the speed of the pumping limit of the compressor wheel.
    [5]
    Method according to one of the preceding claims, characterized in that the injection of fuel into the cylinders (5-12) is actuated in order to balance the working load / speed of the various turbine wheels (20, 21) with one another.
    [6]
    Method according to one of the preceding claims, characterized in that the injection of fuel into the cylinders (5-12) is influenced to regulate the speed of the turbine wheels (20, 21) towards one and the same value.
    [7]
    Method according to one of the preceding claims, characterized in that the control of the speed of the respective turbine wheels (20, 21) is carried out by controlling the amount of fuel injected into cylinders (5-12) associated with the turbine wheel.
    [8]
    Method according to any one of the preceding claims, characterized in that it comprises controlling the speed of the respective turbine wheels (20, 21) by controlling an execution of post-injections of fuel in cylinders (5-12) associated with the turbine wheel, i.e. injection of fuel after the combustion which has taken place in the respective cylinder for the purpose of influencing the piston of the cylinder, in order to influence the pressure of exhaust pulses and the temperature of exhaust gases from the cylinder.
    [9]
    Method according to one of the preceding claims, characterized in that it comprises regulating the speed of the respective turbine wheels (20, 21) by regulating the times for injecting fuel into the cylinders (5-12) associated with the turbine wheel.
    [10]
    A system for controlling a supercharging system with a plurality of turbine wheels (20, 21), each of which is arranged in an exhaust line (16, 17) from other cylinders of an internal combustion engine (2) than the cylinders in whose exhaust lines or the other turbine wheels are arranged, the turbine wheels (20, 21) being arranged to drive each compressor wheel (22, 23) arranged in an air intake line (13) to the internal combustion engine, the system comprising means (25, 26) designed to produce a value of the speed of the respective turbine wheels and a device (27) designed to regulate the speed of the turbine wheels in dependence on said means of said speed values obtained therefrom, characterized in that the device (27) is designed to regulate the speed of the respective turbine wheel (20, 21) by influencing the injection of fuel into the cylinders (5-12) whose exhaust line (16, 17) is connected to the turbine wheel.
    [11]
    System according to claim 10, characterized in that it comprises a unit (18) designed to compare produced speed values for the turbine wheels (20, 21) with setpoints for these and control the device (27) to perform said control on the basis of of the result of this comparison. 10 15 20 25 15
    [12]
    A computer program that is loadable directly into the internal memory of a computer, the computer program comprising computer program code for causing the computer to control the steps of any of claims 1-9 when said computer program is run on the computer.
    [13]
    A computer program product comprising a durable data storage medium readable by a computer, the computer program code of a computer program according to claim 12 being stored on the data storage medium.
    [14]
    An electronic control unit for an internal combustion engine comprising an execution means (30), a memory (32) connected to the execution means and a data storage medium (33) connected to the execution means, the computer program code of a computer program according to claim 12 being stored on said data storage medium (33) .
    [15]
    Motor vehicle, characterized in that it comprises a system for controlling a turbocharger of an internal combustion engine according to claim 10 or 11.
    [16]
    Motor vehicle according to claim 16, characterized in that it is a wheeled motor vehicle, such as a truck or bus, or a boat.
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    法律状态:
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    KR1020197017660A| KR20190073612A|2014-04-29|2015-04-27|Method and system for control of a forced induction system|
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