• 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:
    A method of controlling multiple injections by an injection system, including a common rail injection system for injecting fuel into an internal combustion engine. The injection is at least in the form of two successive partial injections over time using an injector comprising a needle. According to the method, the moment of closure of at least one injector needle is grasped (300) and, depending on the moment of closure gripped by the injector needle, it is recognized (310) the existence of a operating state for which there is a fuel passage between at least two partial injections.
    公开号:FR3022002A1
    申请号:FR1555039
    申请日:2015-06-03
    公开日:2015-12-11
    发明作者:Heike Lang
    申请人:Robert Bosch GmbH；
    IPC主号:
    专利说明:

    [0001] Field of the Invention The present invention relates to a method of controlling multiple injections by an injection system, especially a common rail injection system for injecting fuel into an internal combustion engine, injection taking place at least in the form of two successive partial injections over time using at least one injector comprising a needle. The invention also relates to a computer program, a machine-readable data medium for recording the computer program and an electronic control apparatus for executing the method. STATE OF THE ART It is known in common-rail injection systems for injecting fuel into an internal combustion engine, to modify the time interval between the different injections or the duration of the different injections to influence the combustion processes in the combustion chambers of the engine. The injection is done in known manner with injectors actuated by needles.
    [0002] If the time interval between two separate injections is too short, we have what is called a fuel "passage", that is, at least two separate injections join together and function as a single longer injection. . This results in a virtually uncontrollable increase in the injected dose and thus a deterioration of the combustion process. DESCRIPTION AND ADVANTAGES OF THE INVENTION The invention is based on the consideration that such a fuel passage also has the consequence that the instant of closure of the injector needle is delayed in time or is shifted in the direction of the delay. This effect is used according to the invention somehow in the opposite direction in that a passage in the case of multiple injections that follow in time, including two simple injections or partial injections that follow can be detected indirectly or monitored by entering the precise closing instant of a concerned injector needle. The capture of the instant of closure of an injector needle can be done in known manner using injector closure sensors. In the case where a variation of the moment of closure of the needle and / or a delay in the time of the closing operation of the needle is recognized, it is concluded that there is a bound fuel passage regularly to a significant increase in the injected dose. Such a detected fuel passage can be remedied, preferably by adjusting or changing the time interval between the two partial injections and / or the control time of at least two partial injections, ie ie by neutralizing or terminating this undesirable state of operation. It is thus possible to increase the time interval between two partial injections when the state of passage is detected with an empirically determined correction value beforehand and / or to reduce the control time of at least two partial injections, the corresponding correction value being determined empirically beforehand. It is also possible to take an appropriate correction value specific to the injector in a table of correction values or similar means containing the recording, for example correction values of all the injectors of one or more internal combustion engines. This makes it possible to advantageously apply the process to the entire injection system. The capture and evaluation of the variations of the needle closure system can advantageously be done by means of threshold monitoring; a first appropriate threshold, especially for the time of closure of the needle, delayed in time, can be determined beforehand empirically. It is only in the event of a definite delay in the closure of the needle that it is possible to estimate with certainty that it is a fuel passage between two injections.
    [0003] The precise detection or monitoring of the instant of closing of the needle makes it possible to achieve the smallest possible injection intervals hydraulically and even during the operation of the injection system or the internal combustion engine that it uses, one can make a precise adaptation or a regulation / control of the gaps or injection intervals.
    [0004] In addition, the method according to the invention also makes it possible during operation to effectively compensate for any tolerance of the action chain or manufacturing tolerances, in particular the tolerances of the injectors concerned or of the injection nozzles with downstream regulation. (regulation loop) for effective compensation. The method according to the invention can also be executed only once detected the existence of two partial injections that follow in time which saves resources or system capabilities. It can further be verified whether the interval or time difference between two partial injections falls below a second predetermined threshold empirically. Only when passing down this second threshold can we have such a fuel passage.
    [0005] The invention applies in particular to a common rail injection system but it can in principle also apply to other injection systems in which there are multiple injections which follow each other in time, for example urea-water solution injection systems (HWL solution) for the aftertreatment of exhaust gases or the reduction of nitrogen oxides released by fuel combustion. The computer program according to the invention makes it possible to execute each step of the method, in particular when the program is executed by a computer or a control device. It makes it possible to implement the method according to the invention according to an electronic control device without having to make constructive modifications. The machine-readable data medium contains the recording of the computer program according to the invention. Reading the computer program according to the invention on an electronic control device makes it possible to control the control device for multiple injections in an injection system with a method according to the invention. Drawings The present invention will be described in more detail below with the aid of a method of controlling a multiple injection in an injection system shown in the accompanying drawings in which: FIGS. schematically known devices or sensors according to the state of the art to enter the closing time of the needle of an injector in a common rail injection system, Figures 2a-c show in the case of a common rail injection system, the measured curves of the supply of the injector, the injection rate and the movement of the needle of the injector by comparison of the method of the invention and the state of the technique, Figure 3 shows an embodiment of a method according to the invention using a flow chart. DESCRIPTION OF EMBODIMENTS FIG. 1a shows a known sensor system according to EP 1 961 952 A1, for detecting the closure of the injector needle of a common rail injection system in a internal combustion engine. The sensor system consists of a sensor 405 for detecting the opening movement and / or the closing movement of an injector needle (not shown), in particular for detecting the instant of closure and / or of opening of the injector needle. The sensor 405 of the present exemplary embodiment is a piezoelectric or micromechanical acceleration sensor for detecting the mechanical oscillations generated by the movement of the injector needle. The device of Figure la further comprises a sensor module 400 for fixing the amount of fuel to be injected into the combustion chamber of an internal combustion engine not shown, with the aid of the injector. The sensor module 400 includes, in particular, an oscillation sensor in the form of a piezoelectric acceleration sensor 405 for detecting the instant of closure of the injector needle. A microprocessor 410 processes the data. The sensor module 400 further comprises a temperature sensor 415 for measuring the temperature of the fuel in the injector or in the line of the injector in the immediate vicinity of the injector. A data memory 420 contains the compensation quantities specific to the injector. This memory can be interrogated by the control unit of the internal combustion engine. The electronic components 405, 410, 415, 420 of the sensor module 400 are installed on a circuit board holder 430 in the form of a ceramic circuit board in this embodiment. The document WO 2011 085 867 A1 describes an alternative device or sensor system for capturing the instant of closure of an injector needle, making it possible to determine in a particularly precise manner the instant of closure of the injector needle and thus the operating phases of the fuel injection. This device is based on the principle that when the injector needle is closed or opened, there are characteristic pressure variations that can be very accurately grasped. Thus, in particular, the pressure in the control chamber varies significantly at the beginning or the end of the injection phase of a fuel injector and this pressure in the control chamber is detected. in the form of a pressure measurement. Figure lb is a partial axial section of the fuel injector concerned herein and corresponding to WO 2011 085 867 A1; it comprises an injector body 1 with a high-pressure chamber 2 and a low-pressure chamber 3. The two pressure chambers are separated from each other by an injector element 4. The high-pressure chamber 2 communicates through example by a supply channel 5 with a common rail not shown. The low pressure chamber 3 is connected to the fuel tank by a return line 21. The high pressure chamber 2 is connected by injectors not shown to the combustion chamber of an internal combustion engine also not shown. The injectors are controlled in known manner by the injector needle of which FIG. 1b shows only the end remote from the injection nozzle and which is in the form of a plunger 6. The plunger 6 is housed in such a way that cooperate in the direction of the discharge in a control chamber 7 in the injector part 4. This control chamber 7 communicates by means of a supply throttling organ 8 with the high-pressure chamber 2 and by an outlet channel 9 preferably throttled with the low pressure chamber 3; the outlet channel 9 is controlled by a valve control device 10. When the outlet channel is closed by the valve control device 10 and the injector needle is in the closed position, it is established in the control chamber 7, the same high pressure as in the high pressure chamber 2 so that the plunger 6 is pushed down according to FIG. 1b and the injector needle connected thereto, remains held in the closed position which blocks the injector. When the outlet channel 9 is opened by the valve control device 10, there is established in the control chamber 7 a reduced pressure with respect to the high pressure in the high-pressure chamber 2 and the plunger 6. moves with the injector needle in the downward direction according to Fig. 1b, i.e. the injector needle moves to the open position so that the fuel is then injected by the injector in the combustion chamber. The control valve device 10 has a sleeve-shaped closure member 11 which is urged by a coil spring 12 in the form of a helical spring against a seat concentric with the outlet port of the outlet channel 9. The closure member 11 in the form of sleeve is guided in axial sliding on a guide rod 13 coaxial with the longitudinal axis 100 of the injector body 1; the annular gap between the inner periphery of the closure member 11 and the outer periphery of the guide rod 13 functions as a leak-free sealing gap.
    [0006] When the closure member 11 assumes the closed position shown in FIG. 1b, the pressure chamber 14 formed in the closure member 11 and which communicates through the outlet channel 9 with the control chamber 7 is thus at the same fluid pressure as the control chamber 7; the pressure chamber 14 is closed vis-à-vis the low pressure chamber 3. The closure member 11 comprises a star-shaped armature 15 of an electromagnet device 16 functioning as an actuator for controlling the device This solenoid device 16 has, in known manner, an electromagnetic coil 17 installed in an electromagnet device concentric with the guide rod 13 with an annular outer pole 18 and an annular inner pole 19.
    [0007] When the electromagnetic coil 17 is supplied with current, the armature 15 is attracted by magnetization by the poles 18 and 19 so that the closure member 11 is lifted from its seat against the force exerted by the closing spring 12 and opens 10 During the closing phase of the injector needle connected to the plunger 6, i.e., when the injectors are closed, the control valve device 10 is closed and the same fluid pressure prevails in the pressure chamber 14 and in the control chamber 7. Immediately before the instant of closure of the injector needle, the pressure drops in the control chamber 7 on the one hand, because at this moment the pressure under the seat of the injector needle is low and secondly, because of the closing movement resulting from the plunger 6 subjected to the high pressure of the supply channel 5. Directly after closing of the injector needle, as the plunger 6 is now immobile, there will be a strong rise in the pressure in the control chamber 7 so that the pressure in this control chamber rises to the pressure of the supply channel 5. The pressure in the chamber of control 7 and thus the substantially identical pressure in the pressure chamber 14 and have a minimum accentuated at the instant of closure of the injector needle. FIG. 1c shows, by way of example, the curve of the stroke of the injector needle (diagram A) of the injector of FIG. 1b and the curve of the pressure in the control chamber (diagram B). presented as an example. As the pressure of the control chamber 7 when the closure member 11 is closed, also prevails in the pressure chamber 14, the guide rod 13 will be biased in the closure member 11, in this position of the injector , front side, always by the pressure in the control room. The pressure in the control chamber is transmitted in particular by the guide rod 13 to a pressure sensor 20 shown schematically in FIG. 1b so that the operating circuit, not shown, connected as input to the pressure sensor 20 receives in The information relating to the pressure in the control chamber 7 is permanently present and, in particular, it captures the closing moments of the injector needle. The operating circuit mentioned above can be integrated in a control unit of the internal combustion engine not shown. The sensor system detecting the instant of closure of the injection needle provides as a measurement signal a voltage or a voltage variation in a range of about 1V. Instead of the piezoelectric sensor system shown in the preceding figures for detecting the instant of closure, one can also consider piezoresistive elements that use the piezoresistive effect according to which many materials have a specific electrical resistance which varies under the effect of compression forces. The curves 200, 205 shown in FIG. 2a have a relatively small interval between the feed for a first injection 210 and the second injection 215 as follows. Measuring the injection rate performed at the feed indicated in FIG. 2b results in two injections 220 which are not sufficiently separated in time. This insufficient temporal separation results in particular from the fact that the injection rates in the event of feeding according to the curve 200 between the two injections 220 do not go down to the output value which is approximately 0 mV but remains at a value significantly higher, equal to 70 mV. As also shown by the injection rate measurement according to FIG. 2b for a greater distance of the feed between the first injection 210 and the second injection 215 according to the curve 205, there are two injections 225 separated significantly. According to the invention, the absent or non-sufficient time separation of the two injections 220 also produces a shift in time or a delay in the needle closing operation. The measuring curves of the movement of the injector needle 230, 235 obtained according to FIG. 2c for a power supply according to the curves 200, 205 illustrate this relationship because the measurement curve 230 resulting from the previous supply 210 is shifted significantly in the direction of the delay with respect to the measurement curve 235 which results from the back feed 205; in the present exemplary embodiment, this is an offset of about 0.05 ms in the delay direction.
    [0008] It should be noted that the scales on the X and Y axes for the measurement curves of FIGS. 2a-2c only represent the results of test examples collected on a test bench or test bench and in no way constitute case an element limiting the invention to the concrete measurement values presented. According to the embodiment of FIG. 3 of the method of the invention, first (300) the operation of closing the needle or a corresponding electrical voltage value, that is to say the moment and / or the level of the tension. From the detected voltage level, it is verified (305) whether the moment also seized of the closure of the needle is shifted more than a predefined threshold empirically in the direction of the delay. If this condition is not satisfied, a needle closing operation is again entered because if this condition 305 is not fulfilled, it is judged according to the invention that there is no passage. prescribed fuel with the disadvantages mentioned for the combustion phase. But if the test (305) shows that the condition is fulfilled, it is assumed that there has been a passage of fuel between the two injections and this is detected (310) and in the next step (315) is adapted, and in particular we note the time difference between the feed curves of the two injections so as to oppose the passage of fuel or to block it. It should be noted that the routine shown in Figure 3 is preferably started only when it detects that there are two injections that follow in time. The described method may be embodied as a control program of an electronic control apparatus for controlling an internal combustion engine or as one or more electronic control units (ECU). 30 NOMENCLATURE OF MAIN ELEMENTS 1 High Pressure Chamber Injector Body 3 Low Pressure Chamber 4 Injector Part 5 Supply Channel 6 Diverter 7 Control Chamber 8 Throttle Body 9 Exit Channel 10 Control Device valve 11 Closing device 12 Closing spring 13 Guide rod 14 Pressure chamber 15 Inductor 16 Electromagnet 17 Electromagnetic coil 18 Outer ring pole 19 Inner ring pole 20 Pressure sensor 21 Return pipe 100 Longitudinal axis 200, 205 Curve 210 First injection 215 Second injection 220 Separate injection 225 Separate injection 230, 235 Injector needle movement 300-315 Professional steps transferred / step in flowchart 400 Sensor Module 405 Sensor 410 Microprocessor 415 Temperature Sensor35
    权利要求:
    Claims (10)
    [0001]
    CLAIMS 1 °) A method of controlling multiple injections by an injection system, including a common rail injection system for injecting fuel into an internal combustion engine, the injection being at least in the form of two injections partial successively with the aid of at least one injector comprising a needle, characterized in that the moment of closure of at least one injector needle is grasped (300), and as a function of When the closure time is entered, the injector needle (310) recognizes the existence of an operating state for which there is a fuel passage between at least two partial injections.
    [0002]
    2) Method according to claim 1, characterized in that the capture of the instant of closure of the injection needle is made using a needle closure sensor system.
    [0003]
    3) Method according to claim 1, characterized in that one compares (305) the closing time entered at a first threshold and it is only if it exceeds the first threshold that we conclude (310) to the existence of a state of passage between at least two partial injections.
    [0004]
    4) Method according to claim 1, characterized in that if the state of passage is detected between at least two partial injections, the time difference of the control of the two partial injections is modified and in particular one increases (315 ) this difference and / or the control duration of at least two partial injections is modified and in particular these control times are reduced.
    [0005]
    Method according to Claim 4, characterized in that firstly increasing the time interval of the control of at least two partial injections of a first empirically determined correction value, and / or decreasing the duration controlling at least two partial injections of a second correction value determined empirically beforehand.
    [0006]
    Method according to claim 5, characterized in that a table of correction values containing the recording of correction values specific to an injector is provided and a correction value is called in the table of correction values.
    [0007]
    7 °) Method according to any one of claims 1 to 6, characterized in that the above steps are performed only when detecting two partial injections that follow in time.
    [0008]
    Method according to Claim 7, characterized in that the time interval between the two partial injections is compared with a second threshold and the steps indicated are carried out only when the second threshold is exceeded.
    [0009]
    Computer program designed to perform the steps of the method according to any one of claims 1 to 8.
    [0010]
    An electronic control apparatus for controlling multiple injections in an injection system by a method according to any one of claims 1 to 8.
    类似技术:
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    同族专利:
    公开号 | 公开日
    CN105317575A|2016-02-10|
    DE102014210561A1|2015-12-17|
    CN105317575B|2020-02-18|
    FR3022002B1|2019-08-09|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP1217197A2|2000-12-22|2002-06-26|Robert Bosch Gmbh|Method and system for controlling the period between two injections|
    DE102008031477A1|2007-08-30|2009-03-05|Ford Global Technologies, LLC, Dearborn|System and method for compensating variable fuel injector characterization in a direct injection system|
    DE102010044210A1|2010-11-22|2012-05-24|Robert Bosch Gmbh|Method for operating internal combustion engine, involves adjusting reference operational mode in which parameter is provided for characterizing temporal difference between end of one partial injection and start of other partial injection|
    JP2007247610A|2006-03-17|2007-09-27|Denso Corp|Fuel injection control device|
    DE102007008617A1|2007-02-22|2008-08-28|Robert Bosch Gmbh|Injector with sensor module and injection system|
    DE102009029549A1|2009-09-17|2011-03-24|Robert Bosch Gmbh|Method for determining a time|
    DE102010000827A1|2010-01-12|2011-07-14|Robert Bosch GmbH, 70469|fuel injector|
    CN103161595B|2011-12-14|2017-08-22|中国第一汽车股份有限公司|Multiple-injection control method for internal-combustion engine fuel system|
    US9074552B2|2012-06-27|2015-07-07|GM Global Technology Operations LLC|Fuel injector closing timing adjustment systems and methods|DE102016217308A1|2016-09-12|2018-03-15|Robert Bosch Gmbh|Method for controlling multiple injections in an injection system|
    DE102016217306A1|2016-09-12|2018-03-15|Robert Bosch Gmbh|Method for controlling multiple injections in an injection system|
    DE102018119402A1|2017-09-28|2019-03-28|Denso Corporation|Fuel injection control device|
    法律状态:
    2016-05-27| PLSC| Search report ready|Effective date: 20160527 |
    2016-06-21| PLFP| Fee payment|Year of fee payment: 2 |
    2017-06-21| PLFP| Fee payment|Year of fee payment: 3 |
    2018-06-25| PLFP| Fee payment|Year of fee payment: 4 |
    2019-06-25| PLFP| Fee payment|Year of fee payment: 5 |
    2020-06-23| PLFP| Fee payment|Year of fee payment: 6 |
    2021-06-22| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102014210561.7A|DE102014210561A1|2014-06-04|2014-06-04|Method for controlling multiple injections, in particular in a fuel injection system of an internal combustion engine|
    DE102014210561.7|2014-06-04|
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