KR102375652B1 - Method for determining the injection quantity of one or more injectors of a fuel metering supply system of a vehicle internal combustion engine - Google Patents

Method for determining the injection quantity of one or more injectors of a fuel metering supply system of a vehicle internal combustion engine Download PDF

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KR102375652B1
KR102375652B1 KR1020197019986A KR20197019986A KR102375652B1 KR 102375652 B1 KR102375652 B1 KR 102375652B1 KR 1020197019986 A KR1020197019986 A KR 1020197019986A KR 20197019986 A KR20197019986 A KR 20197019986A KR 102375652 B1 KR102375652 B1 KR 102375652B1
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internal combustion
combustion engine
injectors
determining
injection amount
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KR20190095350A (en
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로베르트 만프레드 칠케
파트릭 바이쓰
크리스티안 발트
필립 하게만
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로베르트 보쉬 게엠베하
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    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/48—Parallel type
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    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
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    • F02D41/0097—Electrical control of supply of combustible mixture or its constituents using means for generating speed signals
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    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
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    • F02D41/2438—Active learning methods
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    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
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    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2464—Characteristics of actuators
    • F02D41/2467—Characteristics of actuators for injectors
    • 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
    • F02D41/32—Controlling fuel injection of the low pressure type
    • F02D41/34—Controlling fuel injection of the low pressure type with means for controlling injection timing or duration
    • 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
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W50/02—Ensuring safety in case of control system failures, e.g. by diagnosing, circumventing or fixing failures
    • B60W50/0205—Diagnosing or detecting failures; Failure detection models
    • B60W2050/021—Means for detecting failure or malfunction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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    • 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
    • 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
    • F02D2200/0614—Actual fuel mass or fuel injection amount
    • 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
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1002—Output torque
    • 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
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/001—Measuring fuel delivery of a fuel injector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

본 발명은 차량 내연 기관(10)의 연료 계량 공급 시스템의 하나 이상의 인젝터(18)의 분사량을 결정하기 위한 방법에 관한 것이며, 이때, 내연 기관(10)은 전기 기계(40)와 토크 전달식으로 결합되고, 차량의 정지 상태에서 내연 기관(10)은 사전 결정된 회전수 및 사전 결정된 부하로 작동되고, 전기 기계(40)에 의해 생성된 전류의 값이 산출되며, 전기 기계(40)에 의해 생성된 전류의 값으로부터 하나 이상의 인젝터(18)의 분사량이 추론된다.The present invention relates to a method for determining the injection quantity of one or more injectors ( 18 ) of a fuel metering supply system of a vehicle internal combustion engine ( 10 ), wherein the internal combustion engine ( 10 ) is torque-transmittingly coupled to an electric machine ( 40 ) In the stationary state of the vehicle, the internal combustion engine 10 is operated at a predetermined rotation speed and a predetermined load, the value of the electric current generated by the electric machine 40 is calculated, and the value of the electric current generated by the electric machine 40 is calculated. The injection amount of the one or more injectors 18 is inferred from the value of the current.

Figure R1020197019986
Figure R1020197019986

Description

차량 내연 기관의 연료 계량 공급 시스템의 하나 이상의 인젝터의 분사량을 결정하기 위한 방법Method for determining the injection quantity of one or more injectors of a fuel metering supply system of a vehicle internal combustion engine

본 발명은 차량 내연 기관의 연료 계량 공급 시스템의 하나 이상의 인젝터의 분사량을 결정하기 위한 방법과, 그 실행을 위한 컴퓨터 유닛 및 컴퓨터 프로그램에 관한 것이다.The present invention relates to a method for determining the injection quantity of one or more injectors of a fuel metering supply system of a vehicle internal combustion engine, and to a computer unit and a computer program for its execution.

연료 계량 공급 시스템들은 하나 또는 복수의 인젝터에 의해 내연 기관 내 연소에 필요한 연료의 계량 공급을 가능하게 한다. 가솔린 직분사 및 커먼 레일 분사 시에 연료는 연소실 내로 직분사된다. 연소 품질과 이에 따른 내연 기관의 연비 및 배기 가스 거동에 있어서, 계량 공급된 연료량은 매우 중요하다.Fuel metered supply systems enable metering of the fuel required for combustion in an internal combustion engine by means of one or a plurality of injectors. During gasoline direct injection and common rail injection, fuel is injected directly into the combustion chamber. For combustion quality and thus fuel economy and exhaust gas behavior of the internal combustion engine, the metered amount of fuel is very important.

그러나, 계량 공급된 연료량은 인젝터 특성 자체의 영향을 받는다. 내연 기관 내에 사용되는 인젝터들에 발생하는 제작 공차로 인해, 동일한 트리거링에 대하여 상이한 인젝터들에 의해 계량 공급되는 연료량이 대개 상이한데, 이는 연소 품질의 저하를 일으킬 수 있다. 또한, 내연 기관의 모든 실린더들이 동일한 트리거링 시에 동일한 토크를 생성하지는 않는다. 이러한 토크 차이로 인해, 고르지 않은 엔진 작동과 이미션 증가가 발생한다.However, the metered amount of fuel is affected by the injector characteristics themselves. Due to manufacturing tolerances occurring in injectors used in internal combustion engines, the amount of fuel metered by different injectors for the same triggering usually differs, which can lead to a deterioration in the combustion quality. Also, not all cylinders of an internal combustion engine produce the same torque at the same triggering time. This difference in torque results in uneven engine operation and increased emission.

런-업(run-up) 테스트에 의해, 내연 기관의 장착된 인젝터들의 분사량 편차는 최종 소비자 소유의 자동차에서도 분해없이 간단히 검사될 수 있다. 정비소 환경의 특수 조건들은 변화된 작동 모드들과 아울러, 확고하게 규정되는 안정적인 작동점들도 허용한다. 이는 내연 기관의 제어가 운전자 요구를 구현해야 하므로, 통상적으로 주행 작동 중에는 불가능하다. 상이한 분사량들은 내연 기관이 특정 초기 회전수로부터, 하나의 인젝터를 제외한 모든 인젝터들에 대한 규정된 설정 분사량의 사전 결정을 통해 하나의 고정 기간 동안 가속됨으로써(소위 런-업), 내연 기관의 런-업 테스트에서 인식될 수 있다. 이 경우, 실제 상태를 가능한 한 명확하게 인식하기 위해, 경우에 따라 과거에 학습된 값들을 갖는 정확도 기능, 조정 기능 및 보정 기능이 억제된다. 이때 달성된 목표 회전수가 측정된다. 트리거링되지 않는 인젝터는 바뀌어진다. 목표 회전수들이 서로 상이하고, 하나의 목표 회전수가 다른 목표 회전수들의 평균과 현저히 다른 경우, 이로부터 설정 분사량에 대한 실제 분사량의 편차가 추론될 수 있다.By the run-up test, the injection amount deviation of the mounted injectors of the internal combustion engine can be simply checked without disassembly, even in an automobile owned by the end consumer. The special conditions of the workshop environment allow not only varied operating modes, but also firmly defined stable operating points. This is normally not possible during driving operation, as the control of the internal combustion engine must implement the driver's demands. The different injection amounts are determined by the internal combustion engine being accelerated from a certain initial rotational speed through a predetermined determination of a prescribed set injection amount for all injectors except one injector for one fixed period (so-called run-up), whereby the internal combustion engine's run-up It can be recognized in the up test. In this case, in order to recognize the actual state as clearly as possible, the accuracy function, the adjustment function, and the correction function with values learned in the past in some cases are suppressed. At this time, the achieved target rotation speed is measured. Injectors that are not triggered are replaced. When the target rotational speeds are different from each other and one target rotational speed is significantly different from the average of the other target rotational speeds, a deviation of the actual injection amount with respect to the set injection amount may be deduced from this.

그러나 이는, 이 경우 실질적으로 작은 회전수 범위만이 제공되며, 이러한 회전수 범위에서는 인젝터들이 자신의 통상적인 분사량의 소량의 일부만 송출한다는 단점이 있다. 경우에 따라서, 이러한 분사량 범위에서는 특히 분사량이 많을 때 영향을 미치는 에러들이, 검출 가능하기에 충분한 정도의 영향을 미칠 수 없다.However, this has the disadvantage that in this case only a substantially small rotational speed range is provided, in which the injectors deliver only a small fraction of their typical injection amount. In some cases, errors affecting the injection amount, especially when the injection amount is large, cannot have a detectable effect in this injection amount range.

DE 10 2009 028 374 A1호로부터는 하이브리드 차량 내에 배치된, 적어도 하나의 2차 기계와 함께 구동 유닛을 형성하는 내연 기관의 적응 및/또는 진단을 위하여, 내연 기관의 여러 가지 작동 상태들의 설정을 위해 2차 기계를 통해 양 또는 음의 구동 토크가 내연 기관에 연결되고, 설정된 하나의 작동점에서 내연 기관의 하나 이상의 작동 매개변수가 결정되는 방법이 공지되어 있다.From DE 10 2009 028 374 A1, for adaptation and/or diagnosis of an internal combustion engine forming a drive unit together with at least one secondary machine, arranged in a hybrid vehicle, for setting various operating states of the internal combustion engine It is known how a positive or negative drive torque is connected to an internal combustion engine via a secondary machine and one or more operating parameters of the internal combustion engine are determined at one set operating point.

본 발명에 따라, 독립 청구항들의 특징들을 갖는, 차량 내연 기관의 연료 계량 공급 시스템의 하나 이상의 인젝터의 분사량을 결정하기 위한 방법과, 그 실행을 위한 컴퓨터 유닛 및 컴퓨터 프로그램이 제안된다. 바람직한 실시예들은 종속 청구항들 및 하기 상세한 설명의 대상이다.According to the invention, a method for determining the injection amount of one or more injectors of a fuel metering supply system of a vehicle internal combustion engine, having the features of the independent claims, a computer unit and a computer program for its execution, is proposed. Preferred embodiments are the subject of the dependent claims and the detailed description below.

본 발명은 내연 기관과 토크 전달식으로 결합되는 전기 기계에 의해 내연 기관의 부하 발생을 사전 결정하는 수단에 기초한다. 이때, 전기 기계에 의해 특정 엔진 회전수에 대해 생성된 전류는 실제로 구현된 연료량에 대한 척도이다. 하이브리드 구동부의 전기 기계가 이에 특히 적합한데, 이러한 전기 기계는 통상 비교적 강한 출력을 갖고, 이에 따라 마찬가지로 높은 부하점들에 접근할 수 있기 때문이다. 그러나 다른 전기 기계, 예를 들어 회생 작동을 위해 제공되는 전기 기계 또는 소위 48V 전기 시스템의 전기 기계가 사용될 수도 있다. 특히, 본 발명은 전기 기계의 에너지 균형의 평가를 통해, 엔진에 공급된 에너지의 직접 평가를 가능하게 한다.The invention is based on means for predetermining the load generation of an internal combustion engine by means of an electric machine torque-transmittingly coupled to the internal combustion engine. At this time, the electric current generated by the electric machine for a specific engine speed is a measure of the actually realized fuel amount. Electric machines of hybrid drive are particularly suitable for this, since they usually have a relatively strong output and are thus able to approach likewise high load points. However, other electric machines may also be used, for example electric machines provided for regenerative operation or so-called 48V electric systems. In particular, the invention enables a direct evaluation of the energy supplied to the engine, through the evaluation of the energy balance of the electric machine.

본 발명은, 고정 회전수에 대한 내연 기관의 부하점이 차량 정지 상태에서 더 높은 부하로 이동됨으로써, 정비소에서의 인젝터들의 검사 및 특히 결함이 있는 인젝터의 위치 확인을 가능하게 한다. 이를 위해서는, 내연 기관에 부하를 연결시킬 수 있으며, 내연 기관이 "오버런(overrun)"되고 너무 높은 회전수를 설정하는 일 없이 내연 기관이 더 높은 분사량을 사용 가능하도록 하는 전기 기계의 존재 여부가 결정적이다. 이후, 전기 기계에 의해 생성된 전류로부터 분사량이 추론될 수 있다.The invention makes it possible to inspect the injectors in the workshop and in particular to locate defective injectors, by shifting the load point of the internal combustion engine for a fixed number of revolutions from a vehicle standstill to a higher load. To this end, it is decisive whether there is an electric machine that can connect a load to the internal combustion engine and which allows the internal combustion engine to use a higher injection quantity without "overruning" the internal combustion engine and setting too high a rpm. am. Then, the injection amount can be deduced from the electric current generated by the electric machine.

이 경우, 마찬가지로, 예를 들어 배기 가스 재순환 밸브, 스로틀 밸브, 스월 플랩(swirl flap), 위어 플랩(weir flap), 터보차져 등과 같은, 내연 기관의 에너지 송출에 영향을 미치는 조절기들이 검사될 수 있다. 예를 들어 배기 가스 재순환 밸브의 개방 및 폐쇄는 내연 기관의 에너지 송출의 변화와, 이에 따라 평가될 수 있는 전류 변화를 야기할 수 밖에 없다. 이는 터보차져 또는 다른 조절기에 대해 동일하게 적용된다. 이와 같이 결함이 있는(예를 들어 끼인) 조절기가 진단될 수 있다.In this case, the regulators affecting the energy delivery of the internal combustion engine can likewise be inspected, for example exhaust gas recirculation valves, throttle valves, swirl flaps, weir flaps, turbochargers, etc. . The opening and closing of, for example, exhaust gas recirculation valves inevitably lead to changes in the energy output of the internal combustion engine and thus to changes in current that can be evaluated. The same applies for turbochargers or other regulators. In this way, a faulty (eg stuck) regulator can be diagnosed.

바람직하게는 분사량 산출 이전에, 특히 부하 발생 시작 이전에 이미, 특정 릴리즈 조건들이 충족되는지가 검사된다. 특히 전기 기계에 의해 충전되는 배터리의 충전 상태가 최대 충전 상태인지에 대한 검사가 이에 속한다. 왜냐하면, 이러한 배터리가 전기 기계로부터 송출되는 에너지를 흡수해야 하기 때문이다. 바람직하게는, 내연 기관의 구성 요소들의 전기적 기능 성능의 검사도 이에 속한다. 릴리즈 조건들 중 하나가 충족되지 않으면, 부하 발생은 릴리즈되지 않는다. 예를 들어 배터리의 방전을 통해 릴리즈 조건의 충족을 능동적으로 실행하는 것이 가능하다. 바람직하게 부하 발생은 릴리즈 조건들이 충족될 때 릴리즈된다.It is preferably checked that the specific release conditions are met before the calculation of the injection quantity, in particular before the start of the load generation. In particular, this includes checking whether the state of charge of the battery charged by the electric machine is the maximum state of charge. This is because these batteries must absorb the energy emitted from the electrical machine. Preferably, it also belongs to the inspection of the electrical functional performance of the components of the internal combustion engine. If one of the release conditions is not met, the load generation is not released. It is possible to actively effect the fulfillment of a release condition, for example by discharging the battery. Preferably the load generation is released when the release conditions are met.

바람직하게는 분사량 산출 이전에, 특히 부하 발생 시작 이전에 이미, 테스트 결과에 영향을 미칠 수 있는 기능들이 차단 및/또는 스위치 오프된다. 예를 들어 입자 필터 또는 촉매 컨버터의 재생을 위한 기능이 이에 속한다.Preferably, even before the calculation of the injection quantity, in particular before the start of the load generation, functions that may affect the test result are switched off and/or switched off. These include, for example, functions for the regeneration of particle filters or catalytic converters.

바람직하게는 분사량 산출 이전에 내연 기관은 규정된 작동 상태가 된다. 사전에 결정되는 회전수의 사전 결정이 이에 속한다. 바람직하게는, 연료 고압 어큐뮬레이터(레일) 내 압력, 배기 가스 재순환 밸브의 위치, 스로틀 밸브의 위치, 터보차져 액추에이터의 규정된 위치 등으로부터 선택된 하나 이상의 매개변수의 사전 결정도 이에 속한다. 이러한 방식으로, 필적할만한 결과가 얻어진다.Preferably, prior to the calculation of the injection quantity, the internal combustion engine is brought to a defined operating state. This includes the pre-determining of a pre-determined number of revolutions. Preferably also the predetermined determination of one or more parameters selected from the pressure in the fuel high pressure accumulator (rail), the position of the exhaust gas recirculation valve, the position of the throttle valve, the prescribed position of the turbocharger actuator, and the like. In this way, comparable results are obtained.

바람직하게는 분사량 산출 이전에, 인젝터들의 분사량 균등화 또는 토크 균등화가 실행되므로, 각각의 인젝터는 실질적으로 동일한 토크 기여를 제공한다. 예를 들어, DE 195 27 218 A1호 또는 DE 2004 010 412 A1호에는 "연료 밸런스 제어(Fuel Balance Control: FBC)"라는 명칭으로도 알려진 실린더 균등화를 위한 방법["평활 운전 제어(smooth running control)"로도 불림]이 개시되어 있다. 이 경우, 센서 장치들에 의해 내연 기관의 각각 현재의 회전수가 검출되고, 검출된 회전수 곡선은 분석된다. 이러한 방식으로 토크 변동이 검출될 수 있으며, 이로부터 내연 기관의 개별 실린더들 내로 분사되는 연료 질량의 변동이 추론될 수 있다. 이 경우, 분사되는 연료 질량의 차이는 질량 보정값에 의한 설정 분사 질량의 보정을 통해 조정될 수 있다.Preferably, before injection quantity calculation, injection quantity equalization or torque equalization of the injectors is performed, so that each injector provides substantially the same torque contribution. For example, DE 195 27 218 A1 or DE 2004 010 412 A1 describes a method for equalizing cylinders ["smooth running control", also known as "Fuel Balance Control (FBC)"). Also called "] is disclosed. In this case, each current rotation speed of the internal combustion engine is detected by the sensor devices, and the detected rotation speed curve is analyzed. In this way, torque fluctuations can be detected, from which fluctuations in the mass of fuel injected into the individual cylinders of the internal combustion engine can be deduced. In this case, the difference in the injected fuel mass may be adjusted through correction of the set injection mass by the mass correction value.

본 발명에 따른 컴퓨터 유닛, 예를 들어 자동차의 제어 장치 또는 정비소 검사기는 특히 프로그램 기술에 의해 본 발명에 따른 방법을 실행하도록 구성된다.A computer unit according to the invention, for example a control unit of a motor vehicle or a workshop inspection machine, is in particular configured to carry out the method according to the invention by way of a program description.

상기 방법의 컴퓨터 프로그램 형태의 구현도 바람직한데, 이는 특히 실행되는 제어 장치가 다른 목적을 위해서도 사용되고 이에 따라 어차피 존재하는 경우에 특히 적은 비용이 발생하기 때문이다. 컴퓨터 프로그램을 제공하기에 적합한 데이터 매체는 특히 예를 들어 하드 드라이브, 플래시 메모리, EEPROM, DVD 등과 같은 자기식, 광학식 및 전기식 메모리이다. 컴퓨터 네트워크(인터넷, 인트라넷 등)를 통한 프로그램 다운로드도 가능하다.The implementation of the method in the form of a computer program is also preferred, since it is particularly inexpensive if the control device to be executed is used for other purposes and thus exists anyway. Data carriers suitable for providing a computer program are, inter alia, magnetic, optical and electrical memories, such as, for example, hard drives, flash memories, EEPROMs, DVDs and the like. It is also possible to download the program through a computer network (Internet, intranet, etc.).

본 발명의 추가의 장점들 및 실시예들은 상세한 설명 및 첨부 도면으로부터 얻어진다.Further advantages and embodiments of the present invention are obtained from the detailed description and accompanying drawings.

본 발명은 실시예에 의해 도면에 개략적으로 도시되며, 하기에 도면을 참조하여 설명된다.BRIEF DESCRIPTION OF THE DRAWINGS The invention is schematically illustrated in the drawings by way of example and is explained below with reference to the drawings.

도 1은 하나의 연료 분사 시스템 및 복수의 인젝터들을 구비한 내연 기관을 매우 개략적으로 도시한 도면이다.
도 2는 본 발명에 따른 방법의 바람직한 일 실시예를 도시한 순서도이다.
도 3은 본 발명에 따른 방법의 바람직한 일 실시예의 실행 시에 전기 기계에 의해 생성된 전류와, 내연 기관의 회전수 및 분사량을 도시한 그래프이다.1 shows, very schematically, an internal combustion engine with one fuel injection system and a plurality of injectors;
Fig. 2 is a flow chart showing a preferred embodiment of the method according to the present invention.
3 is a graph showing the current generated by the electric machine and the rotational speed and injection amount of the internal combustion engine in the implementation of a preferred embodiment of the method according to the invention;

도 1에는 본 발명의 기초가 될 수 있는, 하나의 연료 계량 공급 시스템을 구비한 내연 기관의 부분도가 개략적으로 도시되어 있으며, 도면 부호 "10"으로 표시되어 있다. 내연 기관(10)은 예를 들어 디젤 엔진일 수 있다.1 schematically shows a partial view of an internal combustion engine with one fuel metering supply system, on which the invention may be based, denoted by reference numeral 10 . The internal combustion engine 10 may be, for example, a diesel engine.

내연 기관(10)은 연료 저장기(12)를 포함하고, 토출 시스템(14)에 의해 이러한 연료 저장기로부터 연료 고압 라인(16) 내로 연료가 토출된다. 토출 시스템(14)은 예를 들어 고압 펌프 및 계량 공급 유닛을 포함할 수 있다.The internal combustion engine 10 includes a fuel reservoir 12 from which fuel is discharged into the fuel high pressure line 16 by way of a discharge system 14 . The dispensing system 14 can include, for example, a high-pressure pump and a metering supply unit.

연료 고압 라인(16)은 예를 들어 커먼 레일로서 형성된다. 연료 고압 라인(16)은, 인젝터들(18)에 각각 할당된 실린더들(20)의 연소실들 내로 연료를 직분사할 수 있도록 하는 인젝터들(18)과 연결된다. 내연 기관(10) 그리고 특히 본원에서 토출 시스템(14), 연료 고압 라인(16), 및 인젝터들(18)을 포함하는 연료 분사 시스템의 작동은 컴퓨터 유닛에 의해, 본원에서는 (엔진) 제어 장치(22)에 의해 제어된다. 제어 장치(22)는 입력값, 예를 들어 현재 회전수의 검출과, 출력값의 제공 또는 액추에이터들의 트리거링, 특히 인젝터들(18)의 트리거링을 가능하게 한다.The fuel high-pressure line 16 is formed, for example, as a common rail. The fuel high-pressure line 16 is connected to the injectors 18 , which make it possible to inject fuel directly into the combustion chambers of the cylinders 20 respectively assigned to the injectors 18 . The operation of the internal combustion engine 10 and in particular here the fuel injection system comprising the discharge system 14 , the fuel high-pressure line 16 , and the injectors 18 is by means of a computer unit, here an (engine) control device ( 22) is controlled by The control device 22 makes it possible to detect an input value, for example the current number of revolutions, and provide an output value or trigger the actuators, in particular the injectors 18 .

내연 기관(10)의 크랭크축(24)과는, 모터 및 발전기로서 작동 가능한 전기 기계(40), 예를 들어 소위 하이브리드 구동부가 토크 전달식으로, 본원에서는 밸트 구동기(30)를 통해 연결된다. 전기 기계(40)는 마찬가지로 제어 장치(22)를 통해 트리거링 가능하다. 전기 기계(40)는 전류 변환기(41)를 통해, 배터리(42)를 포함하는 차량 전기 시스템과 연결된다.To the crankshaft 24 of the internal combustion engine 10 , an electric machine 40 operable as a motor and a generator, for example a so-called hybrid drive, is connected in torque transmission, here via a belt drive 30 . The electric machine 40 is likewise triggerable via the control device 22 . The electrical machine 40 is connected to the vehicle electrical system including the battery 42 via a current converter 41 .

제어 장치(22)는 하기에 도 2 및 도 3을 참조하여 설명되는 바와 같이, 본 발명에 따른 방법의 바람직한 일 실시예를 실행하도록 프로그램 기술에 의해 구성된다. 바람직하게는, 이와 같이 제어 장치에서 또는 제어 장치 내로의 상응하는 인터스페이스를 갖는 정비소 검사기에서 실행되는 프로그램을 통해 인젝터들을 진단하기 위한 방법이 얻어진다. 이 경우, 도 2에는 본 발명에 따른 방법의 바람직한 일 실시예의 순서도가 도시되어 있고, 도 3에는 본 발명에 따른 방법의 바람직한 일 실시예의 실행 시에 전기 기계에 의해 생성된 전류(I)와, 내연 기관(10)의 회전수(n) 및 분사량(m)의 곡선들이 시간(t)에 걸쳐 도시되어 있다.The control device 22 is configured by way of a program description to carry out a preferred embodiment of the method according to the invention, as described below with reference to FIGS. 2 and 3 . Preferably, a method for diagnosing injectors is thus obtained via a program running in the control device or in a workshop inspector having a corresponding interspace into the control device. In this case, FIG. 2 shows a flow chart of a preferred embodiment of the method according to the invention, and in FIG. 3 the current I generated by the electric machine in the implementation of a preferred embodiment of the method according to the invention, Curves of the number of revolutions n and the injection amount m of the internal combustion engine 10 are plotted over time t.

선택적인 단계(401)에서는 우선, 제공된 릴리즈 조건들이 충족되는지가 검사된다. 특히 배터리(42)의 충전 상태의 검사가 이에 속하는데, 이는 배터리가 완충되지 않고, 검사 동안 생성된 전기 에너지를 흡수할 수도 있기 때문이다.In an optional step 401, it is first checked whether the provided release conditions are met. In particular, the inspection of the state of charge of the battery 42 belongs to this, since the battery is not fully charged and may absorb electrical energy generated during the inspection.

릴리즈 조건들이 충족될 때에만, 특히 입자 필터 또는 촉매 컨버터의 재생 기능과 같이 테스트 결과에 영향을 미칠 수 있는 기능들이 차단되는, 마찬가지로 선택적인 단계(402)가 계속된다.A likewise optional step 402 continues, only when the release conditions are met, in which functions that may affect the test result are blocked, in particular the regeneration function of the particle filter or the catalytic converter.

단계(403)에서, 내연 기관은 규정된 작동 상태가 된다. 특히, 이 경우 설정 회전수(n), 예를 들어 무부하 회전수 또는 무부하 회전수에 비해 상승된 회전수가 사전 결정된다. 또한, 규정된 작동 상태가 된다는 것은 고압 어큐뮬레이터(16) 내 압력에 대한 설정값의 사전 결정과, 특히 배기 가스 재순환 밸브, 스로틀 밸브, 터보차져 액추에이터 등과 같은 내연 기관(10)의 추가 구성 요소들에 대한 설정값의 사전 결정을 포함할 수 있다. 현재 분사량(m)은 바람직하게는 저장된다.In step 403, the internal combustion engine is put into a defined operating state. In particular, in this case, the set rotational speed n, for example, the no-load rotational speed or the increased rotational speed compared to the no-load rotational speed is predetermined. In addition, being in a prescribed operating state depends on the pre-determination of a setpoint for the pressure in the high-pressure accumulator 16 and, in particular, on additional components of the internal combustion engine 10 such as an exhaust gas recirculation valve, a throttle valve, a turbocharger actuator, etc. It may include pre-determining a set value for The current injection amount m is preferably stored.

이후, 단계(404)에서는 제1 시점(t0)에(도 3 참조) 인젝터들(18)의 실제적인 검사가 시작된다. 특히, 이 경우 전기 기계(40)의 부하가 단계적으로 또는 (준) 연속적으로 상승한다. 회전수(n)를 일정하게 유지하기 위해, 내연 기관(10)은 이러한 부하를 더욱 실행해야 한다. 이로 인해, 총 분사량(m)은 증가된다. 바람직하게는 이와 동시에, 모든 인젝터들이 동일한 토크 기여를 제공하도록 개별 인젝터들의 상대 분사량들은 서로 매칭된다.Thereafter, in step 404 the actual inspection of the injectors 18 is started at a first time point t 0 (see FIG. 3 ). In particular, in this case, the load of the electric machine 40 rises stepwise or (quasi-) continuously. In order to keep the number of revolutions n constant, the internal combustion engine 10 must further carry out this load. Due to this, the total injection amount m is increased. Preferably at the same time, the relative injection amounts of the individual injectors are matched to each other so that all injectors provide the same torque contribution.

내연 기관(10)을 통한 전기 기계(40)의 구동은 전류 생성을 야기한다. 생성된 전류는 측정되고, 분사를 통한 생성된 엔진 토크에 직접적으로 비례하여 설정될 수 있다. 특히 배터리(42) 내로의 충전 전류가 측정될 수 있다.Driving the electric machine 40 through the internal combustion engine 10 causes current generation. The generated current can be measured and set in direct proportion to the engine torque generated through injection. In particular, the charging current into the battery 42 can be measured.

배터리 내로의 원하는 설정 전류가 얻어져야 한다면, 단계(405)에서는 예를 들어 시점 "t1"에서 실제 전류가 설정 전류에 상응할 때까지 반복적으로 분사량(m)이 매칭될 수 있다. 이러한 방식으로, "충전 전류 0"과 "충전 전류 X" 사이의 분사량(m)의 차이 또는 "충전 전류 0"(t0)으로부터 "충전 전류 X"(t1)까지의 분사량 곡선이 산출될 수 있다. 평가를 위해서는 특히 기준값과의 비교가 실행될 수 있다. 예를 들어, 기준값은 작동 주기당 10mg 만큼의 분사량 증가에 대한 10A 만큼의 충전 전류 증가를 나타낼 수 있다.If a desired set current into the battery is to be obtained, in step 405 the injection amount m may be repeatedly matched until, for example, the actual current corresponds to the set current at time “t 1 ”. In this way, the difference in injection amount m between “charging current 0” and “charging current X” or the injection amount curve from “charging current 0” (t 0 ) to “charging current X” (t 1 ) can be calculated can For evaluation, in particular a comparison with a reference value can be carried out. For example, the reference value may represent an increase in charging current by 10 A for an increase in injection amount by 10 mg per operating cycle.

더 많은 또는 더 적은 분사량이 요구될 경우, 실제로 분사된 총 분사량이 부정확한 것이다. 이와 동시에, 이미 설명한 토크 균등화를 통해서는 분사량의 상대 보정값들이 계산될 수 있다. 이러한 2가지 보정 방법들의 조합을 통해서는 각각의 개별 인젝터의 절대적인 개별 에러가 얼마나 큰지에 대한 정보가 획득될 수 있다. 이에 따라, 요구되는 보정값이 너무 큰 경우에는, 개별 인젝터들에 에러가 있는 것으로 진단될 수 있다.If more or less injection quantity is required, the total injection quantity actually injected is incorrect. At the same time, relative correction values of the injection amount can be calculated through the already described torque equalization. Through a combination of these two correction methods, information on how large the absolute individual error of each individual injector is can be obtained. Accordingly, if the required correction value is too large, the individual injectors can be diagnosed as having errors.

선택적으로, 이제 단계(406)에서는 시점 "t2"에서, 내연 기관(10)의 에너지 송출에 영향을 미치는 조절기가 검사될 수 있다. 이 경우, 조절기의 설정값, 예를 들어 배기 가스 재순환 밸브의 개방도가 변화되고, 예를 들어 상승된다. 이는 언급된 예에서 내연 기관(10)의 출력 감소를 야기하므로, 분사량(m)이 동일하게 유지될 때 회전수(n)의 안정화를 위해 더 적은 전기 부하가 필요할 뿐이다. 이로 인해, 전류(I)는 강하한다. 이러한 강하의 정도로부터 조절기의 기능 성능이 추론될 수 있다.Optionally, now in step 406 , at time “t 2 ”, a regulator affecting the energy output of the internal combustion engine 10 can be checked. In this case, the setpoint of the regulator, eg the opening of the exhaust gas recirculation valve, is changed, eg raised. Since this causes a decrease in the output of the internal combustion engine 10 in the mentioned example, only a smaller electrical load is required for stabilization of the rotational speed n when the injection amount m remains the same. Due to this, the current I drops. From the degree of this drop, the functional performance of the regulator can be inferred.

단계(407)에서는 예를 들어 서비스 기술자의 요구에 따라서 또는 하나 이상의 릴리즈 조건(예를 들어 배터리의 완충)이 더 이상 충족되지 않는 경우에 상기 방법이 종료된다.In step 407, the method ends, for example at the request of a service technician or when one or more release conditions (eg full battery) are no longer met.

Claims (10)

차량 내연 기관(10)의 연료 계량 공급 시스템의 하나 이상의 인젝터(18)의 분사량을 결정하기 위한 방법이며, 내연 기관(10)은 전기 기계(40)와 토크 전달식으로 결합되고, 차량의 정지 상태에서 내연 기관(10)은 사전 결정된 회전수(n) 및 사전 결정된 부하로 작동되고, 전기 기계(40)에 의해 생성된 전류(I)의 값이 산출되며, 전기 기계(40)에 의해 생성된 전류(I)의 값으로부터 하나 이상의 인젝터(18)의 분사량(m)이 추론되고, 전기 기계(40)에 의해 생성된 전류(I)의 값의 곡선이 복수의 상이한 부하들에 대해 결정되고, 상기 곡선으로부터 하나 이상의 인젝터(18)의 기능 성능이 추론되는, 인젝터 분사량 결정 방법.A method for determining the injection quantity of one or more injectors (18) of a fuel metering supply system of a vehicle internal combustion engine (10), wherein the internal combustion engine (10) is torque-transmittingly coupled to an electric machine (40), and in a stationary state of the vehicle The internal combustion engine 10 is operated with a predetermined number of revolutions n and a predetermined load, the value of the electric current I produced by the electric machine 40 is calculated, the electric current produced by the electric machine 40 The injection amount m of the one or more injectors 18 is inferred from the value of I, and a curve of the value of the current I generated by the electric machine 40 is determined for a plurality of different loads, wherein A method for determining an injector injection quantity, wherein the functional performance of one or more injectors (18) is inferred from the curve. 제1항에 있어서, 전기 기계(40)에 의해 생성된 전류(I)는 하나 이상의 인젝터(18)의 분사량(m)의 변화를 통해 설정값으로 조정되는, 인젝터 분사량 결정 방법.Method according to claim 1, characterized in that the current (I) generated by the electric machine (40) is adjusted to a set value through a change in the injection amount (m) of one or more injectors (18). 제1항 또는 제2항에 있어서, 분사량(m)의 산출 이전에 하나 이상의 인젝터(18)의 토크 기여가 균등화되는, 인젝터 분사량 결정 방법.Method according to claim 1 or 2, characterized in that the torque contribution of the at least one injector (18) is equalized before the calculation of the injection amount (m). 삭제delete 제1항 또는 제2항에 있어서, 내연 기관의 에너지 송출에 영향을 미치는 조절기의 설정값이 변화되고, 전기 기계(40)에 의해 생성된 전류(I)의 값으로부터 조절기의 기능 성능이 추론되는, 인젝터 분사량 결정 방법.3. The method according to claim 1 or 2, wherein the setpoint of the regulator affecting the energy output of the internal combustion engine is changed, and the functional performance of the regulator is inferred from the value of the current (I) generated by the electric machine (40) , how to determine the injector injection volume. 제1항 또는 제2항에 있어서, 전기 기계(40)에 의해 생성된 전류(I)의 산출 이전에
- 하나 이상의 릴리즈 조건이 충족되는지 그리고/또는
- 테스트 결과에 영향을 미칠 수 있는 하나 이상의 기능이 차단되는지 그리고/또는
- 내연 기관(10)이, 규정된 작동 상태가 되는지 여부가 검사되는, 인젝터 분사량 결정 방법.3. A method according to claim 1 or 2, prior to the calculation of the current (I) generated by the electrical machine (40).
- one or more release conditions are met and/or
- whether one or more functions that could affect the test results are blocked and/or
- a method for determining the amount of injector injection, in which it is checked whether the internal combustion engine 10 is in a prescribed operating state. 제1항 또는 제2항에 있어서, 인젝터 분사량 결정 방법은 정비소에서 실행되는, 인젝터 분사량 결정 방법.The method for determining an injector injection amount according to claim 1 or 2, wherein the method for determining an injector injection amount is performed in a workshop. 제1항 또는 제2항에 따른 인젝터 분사량 결정 방법을 실행하도록 구성된 컴퓨터 유닛(22).A computer unit (22) configured to execute the method for determining an injector injection amount according to claim 1 or 2. 기계 판독 가능한 저장 매체에 저장되어 있고, 컴퓨터 유닛(22)에서 실행될 때, 컴퓨터 유닛으로 하여금 제1항 또는 제2항에 따른 인젝터 분사량 결정 방법을 실행하도록 지시하는, 컴퓨터 프로그램.A computer program stored in a machine-readable storage medium and, when executed in a computer unit (22), instructs the computer unit to execute the method for determining an injector injection amount according to claim 1 or 2. 제9항에 따른 컴퓨터 프로그램이 저장되는, 기계 판독 가능한 저장 매체.A machine-readable storage medium on which the computer program according to claim 9 is stored.
KR1020197019986A 2016-12-15 2017-11-15 Method for determining the injection quantity of one or more injectors of a fuel metering supply system of a vehicle internal combustion engine KR102375652B1 (en)

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PCT/EP2017/079244 WO2018108414A1 (en) 2016-12-15 2017-11-15 Method for determining an injection amound of at least one injector of a fuel metering system of an internal combustion engine of a vehicle

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