EP3289205A1 - Procédé de détection d'une injection continue lors du fonctionnement d'un moteur à combustion interne, système d'injection pour un moteur à combustion interne et moteur à combustion interne - Google Patents

Procédé de détection d'une injection continue lors du fonctionnement d'un moteur à combustion interne, système d'injection pour un moteur à combustion interne et moteur à combustion interne

Info

Publication number
EP3289205A1
EP3289205A1 EP16711982.5A EP16711982A EP3289205A1 EP 3289205 A1 EP3289205 A1 EP 3289205A1 EP 16711982 A EP16711982 A EP 16711982A EP 3289205 A1 EP3289205 A1 EP 3289205A1
Authority
EP
European Patent Office
Prior art keywords
pressure
high pressure
continuous injection
internal combustion
combustion engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16711982.5A
Other languages
German (de)
English (en)
Other versions
EP3289205B1 (fr
Inventor
Armin DÖLKER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rolls Royce Solutions GmbH
Original Assignee
MTU Friedrichshafen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MTU Friedrichshafen GmbH filed Critical MTU Friedrichshafen GmbH
Publication of EP3289205A1 publication Critical patent/EP3289205A1/fr
Application granted granted Critical
Publication of EP3289205B1 publication Critical patent/EP3289205B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/224—Diagnosis of the fuel system
    • F02D2041/225—Leakage detection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/14—Timing of measurement, e.g. synchronisation of measurements to the engine cycle

Definitions

  • the invention relates to a method for detecting a continuous injection during operation of an internal combustion engine, an injection system for an internal combustion engine and a
  • German Patent DE 10 2011 100 187 B3 discloses a method for controlling and regulating an internal combustion engine having a common rail system and a passive pressure limiting valve for discharging fuel from a rail into a fuel tank, in which case an open pressure limiting valve is recognized when the fuel pressure is released Rail pressure within a predetermined period of time both exceeds a first limit and falls below a second, lower limit. A permanent injection is not recognizable with this procedure. Permanent injection is an event in which, even outside predetermined injection times, in particular permanently, fuel leaks into a combustion chamber of an internal combustion engine through a fuel injector. Such
  • Continuous injections can be caused for example by jamming nozzles, needles or otherwise defective injectors. Result of such events is that the combustion chamber of the internal combustion engine is supplied to an excessive amount of fuel, which can lead to malfunction up to the damage of the internal combustion engine during operation of the internal combustion engine.
  • quantity limiting valves are typically installed, which are provided in particular integrated in injectors.
  • flow control valves are typically made in small batches, which are expensive to manufacture and expensive.
  • injectors manufactured in mass production typically do not have flow control valves. In order to be able to save costs in connection with the manufacture and operation of an internal combustion engine, it is desirable to be able to recognize a permanent injection also otherwise than by striking a quantity limiting valve.
  • the invention has for its object to provide a method and an injection system for an internal combustion engine and an internal combustion engine, said disadvantages do not occur.
  • the injection system and the internal combustion engine it should be possible by means of the method, the injection system and the internal combustion engine to be able to recognize continuous injections independently of the presence of a quantity limiting valve.
  • Continuous injection is provided during operation of an internal combustion engine, wherein in the context of the method, an internal combustion engine is operated, which has an injection system having a high-pressure accumulator for a fuel.
  • an internal combustion engine is operated, which has an injection system having a high-pressure accumulator for a fuel.
  • an injection system having a high-pressure accumulator for a fuel.
  • Continuous injection time interval has fallen by a predetermined continuous injection differential pressure amount. It will continue to be examined - in particular - to see if the
  • Continuous injection differential pressure amount has fallen.
  • the drop of the high pressure by the predetermined continuous injection differential pressure amount within the predetermined continuous injection time interval forms a safe criterion for being able to reliably conclude a continuous injection, in particular if other events causing such a pressure drop are excluded.
  • Continuous injection can be closed as the cause of the drop in high pressure, the continuous injection can be detected and diagnosed by the fall of the high pressure. It is then readily possible to initiate measures after detection of the continuous injection, which protect the internal combustion engine from damage.
  • an internal combustion engine is preferably operated, which has a so-called common rail injection system.
  • common rail injection system Here is in particular a
  • High-pressure accumulator provided for fuel, which is fluidly connected to at least one, preferably with a plurality of injectors for injecting the fuel.
  • High-pressure accumulator acts as a buffer volume to dampen and dampen pressure fluctuations caused by individual injection events. For this purpose, provision is made in particular for the fuel volume in the high-pressure accumulator to be large in comparison to a fuel volume injected within a single injection event. In particular, if a plurality of injectors are provided, the high-pressure accumulator advantageously causes a
  • High-pressure accumulator high pressure present - in particular by means of a on the High pressure accumulator arranged pressure sensor - measured.
  • the high-pressure accumulator proves to be a particularly suitable location for measuring the high pressure, in particular because of the attenuating effect of the high-pressure accumulator on the individual
  • the measured raw values are not used as the high-pressure, but rather that the measured high-pressure values are filtered, the filtered high-pressure values being based on the method.
  • a PTV filter is particularly preferably used. This filtering has the advantage of being able to filter out short-term high-pressure fluctuations which might otherwise interfere with the reliable detection of a pressure drop of the high-pressure actually indicating continuous injection. It is possible that the recorded high pressure values during operation of the
  • a first filter is preferably provided for filtering for the purpose of pressure control, which is preferably designed as a ⁇ filter, wherein for the purpose of detecting a
  • a second filter which is preferably designed as a PTV filter.
  • the second filter is preferably designed as a faster filter, so reacts more dynamically to the measured high pressure values, and in particular a smaller
  • Time constant has as the first high-pressure filter, which is used for pressure control of the high pressure.
  • the output pressure values of the filter used to detect a continuous injection are referred to here and below as dynamic high pressure or dynamic rail pressure.
  • dynamic indicates, in particular, that they are filtered with a comparatively fast time constant, so that although very short-term fluctuations are averaged out, at the same time there is still a comparatively dynamic detection of the actually present high pressure.
  • the test time interval used is preferably a time interval which is at least one second to at most three seconds, particularly preferably two seconds. This time has proved to be particularly favorable in order to rule out that the detected pressure drop is caused by the response of a shut-off valve.
  • This is thus designed as a sliding time window, which extends from the start time in the past.
  • a shut-off valve connecting the high-pressure accumulator to a fuel reservoir has responded means, in particular, that this is monitored continuously, in particular continuously or at predetermined time intervals, in the context of the method.
  • a pressure relief valve in particular a mechanical pressure relief valve, and / or a controllable pressure control valve is used.
  • the injection system has only one mechanical overpressure valve which is responsive above a predetermined overpressure relief pressure amount and depressurizes the high pressure accumulator toward the fuel reservoir. This serves the safety of the injection system and avoids unacceptably high pressures in the high-pressure accumulator.
  • Pressure control valve is provided. This can be used in a normal operation of the internal combustion engine to a disturbance in the form of a specific fuel flow of the
  • a suction throttle which is associated with a high pressure pump, stabilized pressure regulation to stabilize, in particular it is possible that the suction throttle serves as a first pressure actuator in a high-pressure control loop, wherein the controllable
  • Pressure control valve preferably turned on when the high pressure is a predetermined
  • Overpressure-Ab Kunststoff-Druckbetrag exceeds, so that the high-pressure accumulator can be depressurized in the fuel reservoir.
  • the high pressure drops at least in the short term when the mechanical pressure relief valve opens, and / or when the controllable pressure control valve either for the first time to control pressure or to relieve the pressure of the high-pressure accumulator in the sense of
  • An embodiment of the method is also preferred, which is characterized in that a starting high pressure is determined at the starting time, wherein the predetermined
  • Design of the method is based on the idea that by a
  • Deductions are used as part of the procedure.
  • the relief pressure amount it is preferable to use a positive pressure relief amount that is configured to respond to a mechanical relief valve, if so provided.
  • a second overpressure relief amount which may be different from the first overpressure relief amount, is preferably used to control a controllable pressure regulator when it assumes the protective function of a mechanical overpressure valve for the injection system, in which case preferably no mechanical pressure relief valve is provided.
  • An embodiment of the method is also preferred, which is characterized in that the continuous injection test is only carried out when the internal combustion engine has left a predetermined starting phase. This ensures that the internal combustion engine their Normal operation has reached, so that pressure fluctuations in the high pressure - and in particular a drop of the same - not on effects of starting the internal combustion engine
  • the fact that the internal combustion engine has left the predetermined starting phase means, in particular, that it has first reached or exceeded a predetermined idling speed.
  • a permanent injection is detected only when the fuel pre-pressure at the time of drop of the high pressure, in particular at the end of the pressure drop, ie at the moment of reaching the resulting from the start-high minus the continuous injection differential pressure amount high pressure, greater than or equal to the admission pressure setpoint.
  • a relevant point in time is established, to which it must be ensured that the pressure drop is not caused by a drop in the pre-pressure of the fuel.
  • the alarm signal activated.
  • the alarm signal preferably indicates to an operator of the internal combustion engine that a continuous injection is present.
  • a motor stop signal is preferably activated when a
  • Continuous injection is detected. Due to the engine stop signal, the internal combustion engine is preferably turned off. In this way, the internal combustion engine is quickly and safely protected from damage due to the present continuous injection.
  • the engine stop signal is reset when the
  • the control unit is furthermore set up to check, in particular continued, whether the at least one shut-off valve has responded.
  • the controller is finally arranged to detect a continuous injection then - and preferably only - if no shut-off valve has responded in a predetermined test time interval before the high pressure has dropped, and if the high pressure within the predetermined continuous injection time interval by the predetermined continuous injection Differential pressure amount has fallen.
  • the control unit is preferably configured to carry out one of the previously described embodiments of the method.
  • the at least one shut-off valve is selected from a group consisting of a mechanical pressure relief valve and a pressure control valve.
  • An embodiment of the injection system in which a mechanical pressure relief valve and a controllable pressure control valve are provided is also particularly preferred. But is also preferred
  • Embodiment of the injection system in which only a mechanical pressure relief valve and no controllable pressure control valve is provided. Furthermore, an embodiment of the injection system is preferred in which only a controllable pressure control valve and no mechanical pressure relief valve is provided.
  • the control unit is set up to check whether one of the existing shut-off valves has responded. It is specially set up to check if a mechanical
  • Relief valve and / or a controllable pressure control valve has addressed / have.
  • the object is also achieved by providing an internal combustion engine which has an injection system according to one of the exemplary embodiments described above.
  • the internal combustion engine in connection with the internal combustion engine, substantially the advantages which have already been described in connection with the method and the injection system are realized.
  • Locomotive or a railcar is used, or by ships. It is also possible to use the internal combustion engine to drive a defense vehicle, for example a tank.
  • An exemplary embodiment of the internal combustion engine is preferably also stationary, for example, for stationary power supply in emergency operation,
  • the internal combustion engine in this case preferably drives a generator. Also a stationary application of
  • Internal combustion engine for driving auxiliary equipment such as fire pumps on oil rigs
  • an application of the internal combustion engine in the field of promoting fossil raw materials and in particular fuels, for example oil and / or gas possible.
  • the internal combustion engine is also possible to use the internal combustion engine in the industrial sector or in the field of construction, for example in a construction or construction machine, for example in a crane or an excavator.
  • the internal combustion engine is preferably designed as a diesel engine, as a gasoline engine, as a gas engine for operation with natural gas, biogas, special gas or another suitable gas.
  • the internal combustion engine is designed as a gas engine, it is suitable for use in a cogeneration plant for stationary power generation.
  • Computer program product is running on the controller.
  • a Compute rogramm is preferred, which has machine-readable instructions on the basis of which the functionality described above or the method steps described above is / are executed when the computer program product runs on a computing device, in particular a control unit.
  • Procedural steps that are explicit or implicit in connection with the injection system and / or the internal combustion engine are preferably individually or combined with each other steps of a preferred embodiment of the method.
  • Injection system and / or the internal combustion engine which have been explained explicitly or implicitly in connection with the method are preferably individually or combined features of a preferred embodiment of the injection system or the
  • the method is preferably characterized by at least one
  • Process step which is due to at least one feature of the injection system and / or the internal combustion engine.
  • the injection system and / or the internal combustion engine are preferably characterized by at least one feature which is caused by at least one method step of the method according to the invention or a preferred embodiment of the method.
  • Figure 1 is a schematic representation of an embodiment of a
  • Figure 2 is a schematic detail of an embodiment of a
  • Figure 3 is a schematic representation of an embodiment of the method in
  • Figure 4 is a schematic representation of an embodiment of the method as
  • FIG. 5 is a schematic detail of the embodiment of the method according to
  • the injection system 3 is preferably designed as a common rail injection system. It has a low-pressure pump 5 for conveying fuel from a fuel reservoir 7, an adjustable, low-pressure suction throttle 9 for influencing a flowing to a high-pressure pump 11 fuel volume flow, the high pressure pump 11 to promote the fuel with pressure increase in one
  • High-pressure accumulator 13 the high-pressure accumulator 13 for storing the fuel, and preferably a plurality of injectors 15 for injecting the fuel into the combustion chambers 16 of the internal combustion engine 1.
  • the injection system 3 with Single memory is executed, in which case, for example, in the injector 15, a single memory 17 is integrated as an additional buffer volume. It is at the here shown
  • Embodiment provided a particular electrically controllable pressure control valve 19, via which the high-pressure accumulator 13 is fluidly connected to the fuel reservoir 7.
  • a fuel volume flow is defined which is diverted from the high-pressure accumulator 13 into the fuel reservoir 7.
  • Fuel flow is referred to in Figure 1 and in the following text with VDRV.
  • the injection system 3 shown here has a mechanical overpressure valve 20, which also connects the high-pressure accumulator 13 with the fuel reservoir 7.
  • the mechanical pressure relief valve 20 is responsive, that is, it opens when the high pressure in the
  • High-pressure accumulator 13 reaches or exceeds a predetermined overpressure Ab Kunststoff pressure amount.
  • the high-pressure accumulator 13 is then relieved of pressure via the mechanical pressure relief valve 20 to the fuel reservoir 7. This serves for the safety of the injection system 3 and avoids unacceptably high pressures in the high-pressure accumulator 13.
  • the mode of operation of the internal combustion engine 1 is determined by an electronic control unit 21, which is preferably designed as an engine control unit of the internal combustion engine 1, namely as a so-called engine control unit (ECU).
  • the electronic control unit 21 includes the usual components of a microcomputer system, such as a
  • FIG. 1 shows by way of example the following input variables: A measured, still unfiltered high pressure p which prevails in the high-pressure accumulator 13 and is measured by means of a high-pressure sensor 23, a current engine speed n h is a signal FP for output specification by an operator of the internal combustion engine 1, and FIG Input quantity E.
  • the input quantity E preferably comprises further sensor signals, for example a charge air pressure of an exhaust gas turbocharger.
  • Injection system 3 with individual memories 17 is an individual accumulator pressure pe, preferably an additional input variable of the control unit 21.
  • a signal PWMSD for controlling the suction throttle 9 as a first pressure actuator a signal ve for example Control of the injectors 15 - which in particular a start of injection and / or a
  • a high pressure control circuit 25 is shown schematically in a box shown by a dashed line, which is adapted to control the high pressure in the high pressure accumulator 13. Outside the high pressure control loop 25 and the box marked by the dashed line box a continuous injection detection function 27 is shown ,
  • the input variable of the high-pressure control loop 25 is a desired high-pressure ps determined by the control unit 21 and used to calculate a control deviation e p with an actual high-pressure p ! is compared.
  • the setpoint high pressure p s is preferably a function of a speed ni of the internal combustion engine 1, a load or torque request to the
  • High pressure control loop 25 are in particular the speed n ! the internal combustion engine 1 and a target injection amount Qs.
  • the output variable is the high-pressure control loop 25
  • Proportionalbeiwert kpsD- output of the high-pressure regulator 29 is a nominal fuel flow rate VSD for the intake throttle 9, to which a fuel target consumption VQ is added in an addition point 31.
  • This fuel target consumption VQ is in a first
  • Calculation member 33 in response to the rotational speed ni and the target injection amount Qs calculated and represents a disturbance of the high pressure control loop 25.
  • Suction choke 9 limited.
  • the output variable of the limiting element 35 results in a limited nominal fuel flow V S , SD for the intake throttle 9, which enters into a pump characteristic 37 as an input variable.
  • V S , SD is converted into a suction throttle target current I S , SD .
  • the suction throttle target current I S, SD represents an input of a Saugdrossel current regulator 39, which has the task of regulating a Saugdrosselstrom through the suction throttle 9.
  • Another input variable of the suction throttle current regulator 39 is an actual suction throttle current I I
  • SD output variable of the suction throttle current regulator 39 is a suction throttle target voltage U S, SD> which finally in a second calculation element 41 in a duty cycle of a pulse width modulated signal PWMSD for the suction throttle 9 is converted.
  • the suction throttle 9 is driven, the signal thus acts on a total of a controlled system 43, which in particular the suction throttle 9, the high pressure pump 11, and the high-pressure accumulator 13 has.
  • the Saugdrosselstrom is measured, resulting in a raw measurement I R, SD , which is filtered in a current filter 45.
  • the power filter 45 is
  • Output variable of this current filter 45 is the actual suction throttle current I ⁇ SD , which in turn is the Saugdrossel current regulator 39 is supplied.
  • the control variable of the first high pressure control loop 25 is the high pressure p in the
  • High-pressure accumulator 13 Raw values of this high-pressure p are measured by the high-pressure sensor 23 and filtered by a first high-pressure filter element 47, which has the actual high-pressure pi as output variable.
  • the first high pressure filter element 47 is preferably implemented by a PT 1 algorithm.
  • the function of the continuous injection detection function 27 is explained in more detail below:
  • the raw values of the high pressure p are filtered by a second high-pressure filter element 49 whose output variable is a dynamic rail pressure payn.
  • the second high pressure filter element 49 is preferably implemented by a PT1 algorithm.
  • a time constant of the first high-pressure filter element 47 is preferably greater than a time constant of the second high-pressure filter element 49.
  • the second high-pressure filter element 49 is a faster filter than the first high-pressure filter element 47 is formed.
  • the time constant of the second high-pressure filter element 49 can also be identical to the value zero, so that then the dynamic rail pressure pdyn corresponds to the measured raw values of the high pressure p or is identical to these.
  • a difference between the desired high pressure ps and the dynamic rail pressure pdyn results in a dynamic high pressure control deviation edyn.
  • the dynamic high pressure control deviation edyn is an input variable of a functional block 51 for detecting a continuous injection.
  • Other input parameters that can be parameterized in particular are a predetermined starting differential pressure value, a predetermined test time interval ⁇ ⁇ , a predetermined continuous injection time interval EtL, a predetermined continuous injection differential pressure amount ⁇ ⁇ , a fuel admission pressure p F , the dynamic rail pressure pdyn, and an alarm reset signal AR.
  • Function block 51 is a motor stop signal MS, and an alarm signal AS.
  • Fig. 2b shows that the engine stop signal MS, if it assumes the value 1, that is set, triggers an engine stop, in which case also a stop of the internal combustion engine 1 causing logical signal SAkt is set.
  • the triggering of a motor stop can also have other causes, eg. B. setting an external engine stop.
  • an external stop signal SE is identical to the value 1 and it is - since all possible stop signals are connected by a logical OR operation 53 - also the resulting logical signal SAkt with the value 1 identical.
  • Fig. 3 shows a schematic representation of an embodiment of the method in diagrammatic representation, in particular in the form of different timing diagrams, which are shown one below the other.
  • the time diagrams - from top to bottom - are referred to as first, second, etc., diagram.
  • the first diagram is thus in particular the uppermost diagram in FIG. 3, to which the following, correspondingly numbered, diagrams follow at the bottom.
  • the first diagram represents the time course-as a function of a time parameter t-of the dynamic rail pressure pdyn as a solid curve K1 and the time profile of the desired high-pressure ps as a dashed line K2.
  • a first time ti both curves K1, K2 identical.
  • From the first time t] on the dynamic rail pressure pdyn is smaller, while the desired high pressure ps remains constant. This results in a positive dynamic high-pressure control deviation edyn, which becomes identical to the predetermined starting differential pressure amount at a second time t 2 .
  • a time counter runs at act .
  • the dynamic rail pressure pdyn is identical to a starting high pressure Pdyn , s at a second time t 2 .
  • the dynamic rail pressure pdyn has dropped from the start high pressure pdyn, s, by the predetermined continuous injection differential pressure amount Ap P.
  • a typical value for Ap P is preferably 400 bar.
  • the time counter At Akt assumes the following value at the third time t 3 :
  • the predetermined continuous injection time interval At L is thereby preferably via a
  • Abschventils is caused, is checked in the process, whether the high pressure during the predetermined test time interval At M at least one of the predetermined Ab Kunststoff pressure amounts, in particular the first Matterbuch- Ab Kunststoff-Druckbeträge PAI, the criz-Ab Kunststoff-Druckmenge pA2, and / or has reached or exceeded the second overpressure relief amount pA3.
  • a continuous injection test is particularly preferably carried out, that is to say in particular in the test time interval on the basis of a response of a shut-off valve that the high pressure within the predetermined continuous injection time interval AtL is not checked
  • predetermined continuous injection differential pressure amount ⁇ has fallen.
  • a preferred value for the test time interval Atu is a value of 2 s. If no shut-off valve has responded in the predetermined test time interval and the high pressure at the third time t 3 has fallen by at least the predetermined continuous injection differential pressure Ap P within the predetermined continuous injection time interval AtL, it is checked whether the pre-pressurized fuel pressure pF is greater than or equal to one
  • predetermined admission pressure setpoint pF.ijst. Is this, as shown in the second diagram, If so, a permanent injection is detected. If this is not the case, it is assumed that the fuel pres- sure could be responsible for the drop in high pressure, and no continuous injection is detected. A prerequisite for conducting the continuous injection test is also that
  • Another prerequisite for carrying out the continuous injection test is that the dynamic rail pressure p ⁇ jyn has first reached the desired high pressure ps. If a continuous injection is detected at the third time t 3 , the alarm signal AS is set, which changes from the logical value 0 to the logical value 1 in the fifth diagram. At the same time, if the permanent injection is detected, the engine must be switched off
  • Internal combustion engine 1 is changed from the logical value 0 to the logic value of 1.
  • an alarm reset button is operated by the operator of the internal combustion engine 1, so that the alarm reset signal AR, as shown in the eighth diagram, changes from the logical value 0 to the logical value 1. This in turn means that the alarm signal AS, which is shown in the fifth diagram, is reset to the logical value 0.
  • Process monitors whether the internal combustion engine 1 is in its startup phase, and whether the high pressure has reached or exceeded the desired high pressure ps for the first time.
  • the flag is set when the internal combustion engine 1 is no longer in the starting phase, and when the dynamic rail pressure pdyn has first reached or exceeded the desired high pressure ps. If one of these conditions is not met, the flag is not set. If the flag is set, a continuous injection recognition algorithm is continued in a sixth step S6, which is shown in greater detail in FIG.
  • a third step S3 is continued.
  • the third step S3 it is queried whether the internal combustion engine 1 has left the starting phase. If this is not the case, the method is continued in a seventh step S7. If this is the case, however, it is checked in a fourth step S4 whether the dynamic rail pressure control deviation eayn is less than or equal to zero. If this is not the case, which means that the dynamic rail pressure pdyn has not yet reached or exceeded the setpoint high pressure ps, the method is continued in the seventh step S7. On the other hand, if the dynamic rail pressure deviation edyn is less than or equal to 0, the flag is set in a fifth step S5.
  • step S7 is queried whether the internal combustion engine 1 is. If this is not the case, a tenth step S10 is continued. If the internal combustion engine 1, the flag and other logical variables flag 2, flag 3, flag 4 and flag 5 are reset.
  • the flag 2 indicates whether a shut-off valve has responded
  • the flag 3 indicates whether the shut-off valve has responded in the test time interval
  • the flag 4 indicates that a continuous injection has been detected, and thus blocks subsequent executions of the Permanent injection detection, in particular to a standstill and restart of the internal combustion engine 1
  • the flag 5 finally indicates that the continuous injection test was carried out, but no continuous injection was detected, in which he blocks in particular a renewed performance of the continuous injection test until the dynamic High pressure pdyn again has reached or exceeded the desired high pressure ps, and / or until the internal combustion engine 1 - in the case of a temporary shutdown and a restart of the same - again has left its start phase.
  • a ninth step S9 the engine stop stop MS causing a stop of the engine 1 due to a detected continuous injection is also reset, and the logical signal SAk effecting a stop of the engine is also reset.
  • a tenth step S10 it is checked whether both the alarm reset signal AR and the standstill of the internal combustion engine indicative logical Steady signal M 0 and the one detected continuous injection indicating alarm signal AS are set. Is at least one of these logical signals are not set, the method is finished in a twelfth step S12. On the other hand, if all these logic signals are set, the alarm signal AS is reset in an eleventh step Si l.
  • the process is preferably carried out iteratively. This means, in particular, that the method is restarted after its termination in the twelfth step S12-preferably immediately-in the start step SO. Of course, it is preferably provided that this iterative implementation of the method with a complete shutdown of
  • Control unit 21 which is preferably configured to perform the method, ends. The method then preferably starts again after a restart of the control unit 21 at the start step SO.
  • FIG. 5 shows a schematic detail representation of the embodiment of the method according to FIG. 4.
  • FIG. 5 shows a detailed representation of the sixth step S6 according to the flowchart of FIG. 4 again in the form of a flow chart.
  • the method steps carried out within step S6 are referred to below as substeps.
  • Pressure relief valve 20 is present or not. In this case, those in the first need
  • the flag 3 is queried in a seventh substep S6_7. If the flag 3 is set, a twelfth sub-step S6 12 is continued, otherwise it is checked in an eighth sub-step S6_8 whether the dynamic rail pressure control deviation edyn is greater than or equal to the starting differential pressure amount. If this is not the case, the process continues with the seventh step S7 according to FIG. If this is the case, however, it is checked in a ninth sub-step S6_9 whether flag 2 is set. If the flag 2 is not set, an eleventh sub-step S6 11 is continued.
  • the flag 2 is set, it is checked in a tenth substep S6 10 whether the difference between the current system time t and the value of the time variable ts p is less than or equal to the test time interval ⁇ . If this is the case, the process continues with the seventh step S7 according to FIG. If this is not the case, the flag 3 is set in the eleventh sub-step S6_l 1, and the value of the currently prevailing dynamic rail pressure pdyn is assigned to the starting high-pressure Pdyn, s.
  • the time difference variable At is set to the value 0, and the flag 5 is set.
  • the seventeenth sub-step S6 17 it is queried whether the dynamic rail pressure control deviation edyn is less than or equal to zero. If this is not the case, the process continues with the seventh step S7 according to FIG. If this is the case, however, markers 3 and markers 5 are reset in an eighteenth sub-step S6 18, respectively. Subsequently, the method continues with the seventh step S7 according to FIG.
  • Alarm signal AS the engine stop signal MS, and the engine stop causing logical
  • Quantity limiting valve can be omitted, so that it is particularly possible to use for the injection system 3 and the internal combustion engine 1 cost injectors.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un procédé de détection d'une injection continue lors du fonctionnement d'un moteur à combustion interne (1) comprenant un système d'injection (3) comportant un accumulateur haute pression (13) pour un carburant. Selon le procédé, une haute pression dans le système d'injection (3) est surveillée en fonction du temps ; pour détecter une injection continue, on vérifie si la haute pression a chuté dans un intervalle de temps prédéfini (At^) d'injection continue d'une valeur prédéfinie de pression différentielle (App) d'injection continue ; on vérifie si une soupape d'arrêt reliant l'accumulateur haute pression (13) à un réservoir de carburant (7) a répondu ; une injection continue est détectée lorsque, dans un intervalle de temps prédéfini de vérification (ΔΪΜ) avant la chute de la haute pression, aucune soupape d'arrêt n'a répondu et lorsque la haute pression a chuté de la valeur prédéfinie de pression différentielle (App) d'injection continue dans l'intervalle de temps prédéfini (Ati) d'injection continue.
EP16711982.5A 2015-04-29 2016-03-16 Procédé de détection d'une injection continue lors du fonctionnement d'un moteur à combustion interne, système d'injection pour un moteur à combustion interne et moteur à combustion interne Active EP3289205B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015207961.9A DE102015207961B4 (de) 2015-04-29 2015-04-29 Verfahren zum Erkennen einer Dauereinspritzung im Betrieb einer Brennkraftmaschine, Einspritzsystem für eine Brennkraftmaschine und Brennkraftmaschine
PCT/EP2016/000469 WO2016173689A1 (fr) 2015-04-29 2016-03-16 Procédé de détection d'une injection continue lors du fonctionnement d'un moteur à combustion interne, système d'injection pour un moteur à combustion interne et moteur à combustion interne

Publications (2)

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EP3289205A1 true EP3289205A1 (fr) 2018-03-07
EP3289205B1 EP3289205B1 (fr) 2020-09-02

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US (1) US10801434B2 (fr)
EP (1) EP3289205B1 (fr)
CN (1) CN107532537B (fr)
DE (1) DE102015207961B4 (fr)
HK (1) HK1248788A1 (fr)
WO (1) WO2016173689A1 (fr)

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Publication number Publication date
US10801434B2 (en) 2020-10-13
US20180010542A1 (en) 2018-01-11
EP3289205B1 (fr) 2020-09-02
WO2016173689A1 (fr) 2016-11-03
HK1248788A1 (zh) 2018-10-19
DE102015207961B4 (de) 2017-05-11
DE102015207961A1 (de) 2016-11-03
CN107532537A (zh) 2018-01-02
CN107532537B (zh) 2020-10-16

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