• 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 for cleaning injectors of a direct-ignition controlled ignition engine, according to which, during a vacuum operation of said engine, the maximum fuel pressure at first is calculated. injecting for the purpose of cleaning, executing, for at least one predetermined operating speed of the motor, an iterative loop on each revolution of which the value of the injected fuel pressure is incremented by a predetermined value and the time of injection corresponding to said incremented pressure, so as to select, for each operating speed, a cleaning pressure equal to either the maximum fuel pressure to which corresponds an injection time greater than the minimum calibrated injection time determined for the said operating speed, ie at a maximum ceiling pressure corresponding to a calibrated pressure determined for the engine / inj system ectors, if this calibrated pressure is reached during the execution of the iterative loop. Secondly, a cleaning treatment is applied consisting of selecting an operating speed allowing the maximum cleaning pressure, and controlling an operation of the engine by applying this regime and programming said cleaning pressure for a longer treatment period. the operating time allowed while driving in such operating conditions.
    公开号:FR3038002A1
    申请号:FR1555835
    申请日:2015-06-24
    公开日:2016-12-30
    发明作者:Jerome Dileon；Jean-Luc Fremaux；Philippe Serrecchia
    申请人:Continental Automotive GmbH；Continental Automotive France SAS；
    IPC主号:
    专利说明:

    [0001] The invention relates to a method of cleaning injectors of a controlled ignition engine and direct injection. The injector injection orifices of the direct-ignition and direct-injection engines regularly undergo a reduction of their fuel passage section resulting from a fouling phenomenon of these injection orifices caused by the deposition of carbonaceous matter called commonly soot. The consequence of such a phenomenon of fouling consists in a reduction of the quantities of fuel actually injected compared to the quantities of fuel calculated and controlled by the central engine control unit, said ECU 10 for "Engine Control Unit". To compensate for this reduction, the vehicles are equipped with a wealth controller operating from the measurements provided by an oxygen sensor, commonly known as a lambda probe, placed in the exhaust line, and designed to increase injection times. so that the amount of fuel injected coincides with the amount of fuel calculated by the ECU. However, this compensation is accompanied by a degradation of the pollution. In addition, beyond a certain level of fouling, the necessary correction can not be made, and it follows a degradation of engine performance felt by the driver (over-consumption, loss of torque). This situation is signaled by the illumination of a fault indicator triggered by the On-Board Diagnostics 20 or OBD on-board diagnostic system, which warns the driver of the need to call in a professional for a discount. in the state of the injection system which requires, in the majority of cases, to deposit the injectors for cleaning or replacement. The present invention aims to overcome this drawback and its main objective is to provide a method of cleaning injectors of a direct ignition and controlled ignition engine, designed to be used both as a preventive measure and as a preventive measure. curative, and adapted to achieve the cleaning of injectors without requiring the removal of the latter. For this purpose, the invention is directed to a method for cleaning injectors of a direct injection controlled ignition engine comprising a cleaning procedure implemented during a vacuum operation of said engine, consisting of: calculating the maximum fuel pressure to be injected for cleaning, said cleaning pressure, by running, for at least one predetermined operating speed of the engine and, with the origin of the nominal operating point corresponding to this regime, an iterative loop, said first iterative loop, on each revolution of which the value of the injected fuel pressure is incremented by a predetermined value and the injection time corresponding to said incremental pressure is determined, and selecting, for each operating speed, an equal cleaning pressure: either at the maximum fuel pressure at which an injection time greater than the minimum calibrated injection time determined for the said operating speed, ie at a maximum ceiling pressure corresponding to a calibrated pressure determined for the engine / injector system, if this calibrated pressure is reached during the execution of the iterative loop, - and to apply a cleaning treatment of selecting an operating regime allowing the cleaning pressure, and to control an operation of the engine by applying this regime and programming said cleaning pressure, for a duration of treatment greater than the time of cleaning. permissible running operation in such operating conditions.
    [0002] In the first place, the cleaning method according to the invention comprises a cleaning procedure intended to be implemented during a vacuum operation of the engine, that is to say when the vehicle is stopped, engine turning. Thus, this cleaning method can be implemented: - as a preventive measure, for example systematically during each scheduled overhaul of a vehicle, so as to prevent against the formation of excessive soot that may affect the operation of the engine and lead to the illumination of a fault indicator, - as a curative, when a fault indicator triggered by the on-board diagnostic system comes on. - In addition, this cleaning procedure requires no "mechanical" intervention for its implementation, and consists of "after-sales service" embedded in the central engine control unit: to be calculated first, by the implementation of an iterative loop, the maximum fuel injection pressure, called the cleaning pressure, which can be used for cleaning the injectors, and corresponding to a non-operating zone; "dangerous" for the engine, to control, then, the operation of the engine by programming the cleaning pressure, during a treatment time greater than the allowed operating time while driving in such conditions.
    [0003] According to an advantageous embodiment of the invention, prior to starting the cleaning procedure, a motor heating step is carried out for a period of time adapted to obtain a stabilization of the temperature of said engine. .
    [0004] This preliminary step leads to carrying out the cleaning procedure with a stabilized motor temperature which is therefore unlikely to affect the course and the result of this procedure. Furthermore, according to the invention, respectively before the start of the cleaning procedure and after the cleaning treatment, the measurement of the data, called air coefficient lambda, characteristics of the ratio between the air-fuel mixture is carried out advantageously. available and the theoretical value required, and a diagnosis is issued regarding the effectiveness of said cleaning treatment depending on the result of these measurements. According to another advantageous embodiment of the invention, when, for a predetermined operating speed of the engine, at the end of the first iterative loop, the selected cleaning pressure is lower than the maximum ceiling pressure, it is performed, until the value of the torque reserve becomes equal to or greater than a calibrated torque reserve value, a second iterative loop on each revolution of which the torque is first incremented by a predetermined value; motor by an isocouple increase of the torque reserve, and then executing the entire first iterative loop. (It should be noted that by "torque reserve" is meant, in a conventional manner, defining, during a variation of torque resulting, for a constant injected air mass, a variation of the advance to the ignition, the ratio between the maximum torque and the torque obtained for a given value of the ignition advance.The calibrated torque reserve value is, in turn, usually a degraded value of the torque below which corresponds to a dangerous operating zone of the motor). According to this advantageous embodiment, the determination of the cleaning pressure combines, for each regime, a first iterative loop for which the incremented parameter consists of the pressure of the injected fuel, and a second iterative loop in which is integrated the first iterative loop, and for which the incremented parameter is representative of the engine load. This combination of two iterative loops leads to obtaining a higher value of the cleaning pressure while guaranteeing non-"dangerous" operating conditions of the engine during the phase of determining the value of this cleaning pressure and during cleaning treatment.
    [0005] Furthermore, advantageously according to the invention and always with the aim of obtaining the highest possible cleaning pressure, when, for a predetermined operating speed of the engine, at the end of the second iterative loop, the cleaning pressure selected is lower than the maximum ceiling pressure, activation of consumer loads, such as heating, defrosting, headlights, air conditioning, etc., is controlled so as to generate an increase in the resistive torque of the motor, and the execution is restarted the first iterative loop and possibly the second iterative loop. Furthermore, according to another advantageous embodiment of the invention, and more particularly, in order to obtain the highest possible cleaning pressure, the cleaning pressure can be successively calculated for a plurality of predetermined speeds. different operating conditions of the engine, and for selecting the cleaning treatment, an operating mode allowing a maximum cleaning pressure is selected.
    [0006] In addition, when several operating speeds allow a maximum cleaning pressure, it is advantageous, according to the invention, to select the highest rate for the cleaning treatment. The choice of the highest rate makes it possible, in fact, to increase, for the same duration of treatment, the efficiency of the treatment carried out, because of the greater number of injections made per unit of time. Advantageously according to the invention, the cleaning pressure for the highest predetermined operating speed of the motor is calculated first, then successively for operating regimes of decreasing value, and the cleaning treatment is applied directly. when, for one of said operating regimes, the selected cleaning pressure consists of the maximum ceiling pressure. Moreover, in order to obtain the cleaning pressure during the cleaning treatment, when the maximum ceiling pressure is not reached during the execution of the first iterative loop, it is advantageously controlled according to the invention to from the nominal operating point corresponding to the selected speed 30, stepwise incrementing a predetermined value of the value of the fuel pressure injected, then optionally, if necessary, incrementing step by step a predetermined value of the reserve torque, until the said cleaning pressure. Other features and advantages of the invention will become apparent from the detailed description which follows with reference to the accompanying drawings which represent by way of non-limiting example a preferred embodiment. In these drawings: FIG. 1 is a schematic view showing a direct injection controlled ignition engine, FIG. 2 is a graph showing a plurality of fuel injection pressure curves, FIG. represents the general flow diagram of the cleaning method according to the invention; and FIG. 4 represents the algorithm of the cleaning procedure implemented according to the cleaning method of the invention. The method according to the invention is directed to a method of cleaning, as a preventive or curative, injectors of a direct ignition and direct injection engine 1 as shown in FIG. 1. According to this FIG. Controlled ignition and direct injection engine 1 is represented in the form of a single cylinder 2 enclosing a piston 3 actuating a connecting rod 4 and delimiting a combustion chamber 5 inside said cylinder.
    [0007] This engine 1 further comprises: - an intake valve 8 positioned on an air intake pipe 6, - an exhaust valve 9 positioned on an exhaust pipe 7, - an injector 10 positioned with way to inject the fuel directly into the combustion chamber 5, controlled by the engine control unit 11 of the vehicle, programmed to determine the injection pressure PF and the injection time ti during each cycle, and a candle 12. The object of the invention is to make it possible to clean, as a preventive or a curative measure, the injectors 10 of this engine 1, and to this end, the method according to the invention comprises in particular a procedure cleaning adapted to be implemented during a vacuum operation of said engine. As represented in FIG. 3, the cleaning method considered in its entirety, comprises, in advance of the cleaning procedure referenced "PROCESS" in this FIG. 3 and which will be described in detail below with reference to FIG. 30 preliminary step of heating the engine 1 of suitable duration to obtain a stabilization of the temperature T ° m of said engine. This cleaning method further comprises, following the implementation of the cleaning procedure, a step of information on the effectiveness of this cleaning procedure.
    [0008] This information step consists, first of all, in measuring the air coefficient lambda Lbfin, characteristic of the ratio between the available air-fuel mixture and the theoretical value required, to compare this measured value Lbfin with the corresponding value 3038002. Lbini measured at the start of the cleaning procedure, and to issue either an adverse diagnosis concerning the efficiency of the cleaning procedure when the difference (Lbf in-Lbini) is below a predetermined threshold, or a diagnosis of success of the procedure cleaning when the value (Lbf in - Lbini) is greater than the predetermined threshold. In addition, in the case of positive diagnosis, the issuance of this diagnosis is preceded by a reset of the parameters defining the injection conditions. The cleaning procedure described below with reference to FIG. 4 comprises, for its part, a first phase intended to determine the injection conditions during the injector cleaning treatment, which constitutes the second phase of this procedure. cleaning, with the objective of applying, during this treatment, a cleaning pressure equal to or as close as possible to a ceiling maximum pressure PF'x corresponding to a calibrated pressure determined for the engine system 1 / injectors 10.
    [0009] Another parameter used in the course of this cleaning procedure consists of a count parameter CTR at each value of which, except for the value CTR max, is associated a value of engine speed. For purposes better understood below, the counter CTR (0) and CTR (1) are coupled to the same engine speed value Nmax corresponding to the highest preselected operating speed of the engine 1. The following values CTR (2), ... CTR (n), ... CTR (max-1) successively correspond to preselected decreasing values of engine speeds N2 ...> Nn ...> N (max-1) ). The cleaning procedure comprises, first of all, two preliminary steps: a step of initializing the counter (CTR = 0) and injection data consisting in inhibiting the injection parameters previously applied, a measurement step the Lbini lambda air coefficient, a characteristic of the ratio between the available air-fuel mixture and the theoretical value required. The initial step in this cleaning procedure is then to control the operation of the engine 1 with the highest preselected engine speed, Nmax rpm, under operating conditions corresponding to the nominal operating point corresponding to this regime. . On the basis of these data, the first iteration consists of an iterative loop consisting of incrementing step by step the value of the injection pressure PF, with a pitch for example such that cal = 10 bars, and after each incrementation, to compare the calculated injection time ti with the injection time ti ,,, (1) associated with the incremented pressure, so as to: - 3038002 7 - to increment by a new step the value of the injection pressure PF, until possibly reaching a pressure PF at least equal to the PFmax value. either to execute a second iterative loop if ti <tim (As represented in FIG. 2, for an isobaric curve PF1, PF2, PFmax of the injection pressure, the value ti..min (1), timin (2) - - - timin (max) typically corresponds to the injection time below which the injection data are no longer mastered.) The execution of this second iterative loop consists in turn, at each turn of this second loop, and as long as the value of the reserve torque Cres 10 remains lower than a calibrated torque reserve value Cresmax: - in the first place, incrementing by a cal for example such that cal = 2 Nm, the torque motor by an isocouple increase in the torque reserve Cres, - secondly, to then execute the entire first iterative loop. At the end of this second iterative loop, assuming that the value PFmax has not been reached, the next step is to increment the counter CTR by one unit. In addition, the first incrementation of the counter CTR, the incrementation of CTR = 0 to CTR = 1, triggers the activation of consuming loads, such as heating, defrosting, headlights, air conditioning ..., and, consequently, causes a 20 increase of the resistive torque of the engine 1, followed by a restart, with the same engine speed Nmax, the execution of the first iterative loop and possibly the second iterative loop. Following each of the following increments of the counter CTR (CTR> 1), the first step consists in memorizing the previously obtained cleaning pressure (maximum pressure PF obtained with a value of ti> tim, n), as well as the conditions of obtaining this cleaning pressure: engine speed associated with the value of the counter CTR, and load (torque) of the engine 1. The first and second loops are then performed again for the successive schemes of the engine 1 preselected, while maintaining the loads 30 consumers. : - until the maximum pressure PFmax is reached, - until the end of the procedure for calculating the cleaning pressure corresponding to an incrementation to the max value of the CTR counter. The above-described procedure for determining the maximum cleaning pressure that can be implemented for the cleaning treatment thus leads to selecting either an injection pressure equal to the maximum ceiling pressure PFmax or a lower pressure. at this maximum ceiling pressure.
    [0010] In the first case, cleaning pressure = PF'x, this pressure is reached at the end of the implementation of the first iterative loop, under conditions where the effective injection pressure is equal to PF'x. The cleaning treatment can therefore be directly implemented by maintaining said cleaning pressure for a pre-established treatment time greater than the operating time allowed under running conditions under identical conditions. On the other hand, when the procedure described above does not make it possible to achieve a cleaning pressure equal to PF, at the end of the implementation of the two iterative loops for each of the speeds of the engine 1, the selected cleaning pressure consists of the maximum pressure obtained, and assuming that this maximum pressure is identical for several engine 1 regimes, is associated with this maximum pressure, the highest engine speed for processing. In this case, furthermore, the cleaning treatment consists, in the first place, in controlling the operation of the engine 1 with the preselected engine speed, under operating conditions corresponding to the nominal operating point corresponding to this regime. Then, in order to obtain the cleaning pressure, a stepwise incrementation of a predetermined value of the value of the injected fuel pressure is then controlled, then optionally, if necessary, step incrementation of a Predetermined value of the torque reserve, until the said cleaning pressure is obtained. Finally, the cleaning treatment is carried out by programming the cleaning pressure, during a preestablished treatment time greater than the operating time admitted while driving under identical operating conditions.
    [0011] In addition, the cleaning pressure being, in this case, lower than the ceiling maximum pressure PF'x, the duration of the treatment is increased compared to the pre-established treatment time for a treatment carried out, for the same engine speed, with the said maximum ceiling pressure. Such an injector cleaning process of a controlled ignition and direct injection engine has the essential advantages of being designed to be used both as a preventive and a curative, and to be adapted. to perform the cleaning of injectors without requiring the removal of the latter.
    权利要求:
    Claims (5)
    [0001]
    CLAIMS1 / A method for cleaning injectors (10) of a direct ignition and direct injection engine (1), characterized in that it comprises a cleaning procedure implemented during a vacuum operation of said engine , consisting of: - calculating the maximum fuel pressure to be injected for cleaning, the so-called cleaning pressure, by running, for at least one predetermined operating speed of the engine (1), and originating from the corresponding nominal operating point; at this regime, an iterative loop, called the first iterative loop, during each revolution of which the value of the injected fuel pressure is incremented by a predetermined value and the injection time corresponding to said incremented pressure is determined, and by selecting, for each operating speed, a cleaning pressure equal to: - either the maximum fuel pressure at which an injection time is greater than to the minimum calibrated injection time determined for the said operating speed, or at a maximum ceiling pressure corresponding to a calibrated pressure determined for the engine system (1) / injectors (10), if this calibrated pressure is reached during the execution of the iterative loop, and to apply a cleaning treatment consisting of selecting an operating speed allowing the cleaning pressure, and controlling an operation of the engine (1) by applying this regime and programming said pressure of cleaning, during a treatment period greater than the operating time allowed during driving under such operating conditions.
    [0002]
    2 / cleaning method according to claim 1 characterized in that, prior to the start of the cleaning procedure, it implements a step of heating the motor (1) for a period of time adapted to obtain a stabilization of the temperature of the says engine.
    [0003]
    3 / A cleaning method according to one of claims 1 or 2 characterized in that one proceeds, respectively before the start of the cleaning procedure and after the cleaning treatment, the measurement of data, said air coefficient lambda, characteristics of the ratio between the available air-fuel mixture and the theoretical value necessary, and a diagnosis is made concerning the effectiveness of said cleaning treatment depending on the result of these measurements.
    [0004]
    4 / A cleaning method according to any one of claims 1 to 3 characterized in that, when, for a predetermined operating speed of the 3038002 10 engine (1), after the first iterative loop, the selected cleaning pressure is below the maximum ceiling pressure, it is executed, until the value of the torque reserve becomes equal to or greater than a calibrated torque reserve value, a second iterative loop on each revolution of which is incremented, in firstly, by a predetermined value the engine torque by an isocouple increase of the torque reserve, and then performs the entirety of the first iterative loop.
    [0005]
    5 / A cleaning method according to claim 4 characterized in that, for a predetermined operating speed of the engine (1), at the end of the second iterative loop, the selected cleaning pressure is lower than the maximum ceiling pressure, controlling the activation of consuming loads, such as heating, defrosting, headlights, air conditioning, etc., so as to generate an increase in the resistive torque of the motor (1), and restarting the execution of the first iterative loop and eventually of the second iterative loop. 6. The cleaning method as claimed in one of the preceding claims, characterized in that the cleaning pressure is calculated successively for a plurality of different predetermined operating speeds of the engine (1), and it is selected, with a view to cleaning treatment, an operating regime permitting maximum cleaning pressure. 7 / Cleaning method according to claim 6 characterized in that, when several operating modes allow a maximum cleaning pressure, is selected for the cleaning treatment, the highest rate. 8 / cleaning method according to any one of claims 6 or 7 characterized in that one calculates, first, the cleaning pressure for the predetermined operating speed of the engine (1) the highest, then successively for operating regimes of decreasing value, and the cleaning treatment is applied directly when, for one of these operating modes, the selected cleaning pressure consists of the maximum ceiling pressure. 9 / cleaning method according to any one of claims 6 to 8 characterized in that, in order to obtain the cleaning pressure during the cleaning treatment, is controlled from the nominal operating point corresponding to the selected speed, incrementing step by step a predetermined value of the value of the injected fuel pressure, then optionally, if necessary, incrementing stepwise a predetermined value of the reserve of 35 torque, until obtained of the said cleaning pressure.
    类似技术:
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    US20180171956A1|2018-06-21|
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    引用文献:
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    CN110388266B|2019-06-10|2020-12-11|浙江吉利控股集团有限公司|Carbon removal and removal method for vehicle shaking|
    法律状态:
    2016-06-27| PLFP| Fee payment|Year of fee payment: 2 |
    2016-12-30| PLSC| Publication of the preliminary search report|Effective date: 20161230 |
    2017-06-21| PLFP| Fee payment|Year of fee payment: 3 |
    2018-06-26| PLFP| Fee payment|Year of fee payment: 4 |
    2020-06-19| PLFP| Fee payment|Year of fee payment: 6 |
    2021-04-16| TP| Transmission of property|Owner name: CONTINENTAL AUTOMOTIVE FRANCE, FR Effective date: 20210309 Owner name: CONTINENTAL AUTOMOTIVE GMBH, DE Effective date: 20210309 |
    2021-06-22| PLFP| Fee payment|Year of fee payment: 7 |
    2022-02-11| CA| Change of address|Effective date: 20220103 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1555835A|FR3038002B1|2015-06-24|2015-06-24|METHOD FOR CLEANING INJECTORS OF A CONTROLLED IGNITION AND DIRECT INJECTION ENGINE|FR1555835A| FR3038002B1|2015-06-24|2015-06-24|METHOD FOR CLEANING INJECTORS OF A CONTROLLED IGNITION AND DIRECT INJECTION ENGINE|
    CN201680036946.0A| CN107810320B|2015-06-24|2016-06-22|method for cleaning injector of direct injection controlled ignition engine|
    US15/735,210| US10436165B2|2015-06-24|2016-06-22|Method for cleaning injectors of a direct-injection controlled-ignition engine|
    PCT/EP2016/001061| WO2016206802A1|2015-06-24|2016-06-22|Method for cleaning injectors of a direct-injection controlled-ignition engine|
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