CN201583406U - Fault diagnosis system of electronic fuel injection engine - Google Patents
Fault diagnosis system of electronic fuel injection engine Download PDFInfo
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- CN201583406U CN201583406U CN2009202204879U CN200920220487U CN201583406U CN 201583406 U CN201583406 U CN 201583406U CN 2009202204879 U CN2009202204879 U CN 2009202204879U CN 200920220487 U CN200920220487 U CN 200920220487U CN 201583406 U CN201583406 U CN 201583406U
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- fuel injection
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- electronic fuel
- injection engine
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Abstract
The utility model discloses a fault diagnosis system of an electronic fuel injection engine (OBD). A fault diagnosis system module is integrated in a hardware management system controller (ECM) of the engine; the fault diagnosis system comprises a part testing system, a system testing system and a controller testing system; and a heating-type oxygen sensor (2) of the downstream of a catalytic converter (1) is additionally provided on the basis of the parts of the original engine management system. The fault diagnosis system also adds calibration parameters and program codes. In the process of calibration of the OBD, parts of control pulse spectrum and control strategy of the engine electric control system need to be adjusted and optimized, the fault diagnosis program in the software adopts a time-sharing and multitask mechanism to carry out management scheduling on various fault diagnosis tasks, and is organically combined with various control tasks of the original electronic fuel injection engine.
Description
Technical field
The utility model relates to a kind of fault diagnosis system of electronic fuel injection engine.
Background technology
Along with China's phase III Abgasgesetz (hereinafter to be referred as state III) the enforcement on ground such as Beijing and Chinese quadravalence section Abgasgesetz (hereinafter to be referred as state IV) be about to implement vehicle-mounted discharge diagnostic system exploitation the becoming task of top priority of monitoring motor vehicle discharging.The diagnostic test of vehicle-mounted fault diagnosis (OBD) system requirements all can cause when breaking down discharging to surpass the parts or the system of OBD limit value, comprises parts test, system testing and controller (ECM) test.Main diagnosis of parts test and controller have the parts of the relation of inputing or outputing, and as sensor and actuator, are primarily aimed at the parts circuit and test, and comprise the judgement of sensor input value rationality simultaneously; System testing comprises catches fire, catalyst deterioration, cooling system failure etc.; Controller (ECM/PCM) test is used to diagnose the communication failure relevant with controller, hardware fault, and memory change.
Although vehicle-mounted fault diagnosis (OBD) system uses the nearly more than ten years abroad, and starts late at home.The exploitation of OBD system must be coordinated to carry out with the exploitation and the demarcation of engine electric-controlled system, because OBD is except the needs engine electric-controlled system increases minority hardware, the overwhelming majority is software and experimental work, and the OBD system software should be embedded in the engine electric-controlled system program, in the OBD calibration process, need to adjust and optimize the part control arteries and veins spectrum and the control strategy of engine electric-controlled system.
The utility model content
Problem to be solved in the utility model provides the fault diagnosis system of electronic fuel injection engine, this fault diagnosis system has diagnostic test, and all can cause when breaking down discharging to surpass the parts or the system of OBD limit value, comprise parts test, system testing and controller (ECM) test.
Ultimate principle of the present utility model is: electronic fuel injection engine fault diagnosis system (OBD) relates to the improvement that electronic fuel injection engine OBD system hardware is formed, need on existing engine management system basis, increase the sensor hardware of OBD necessity newly, as acceleration transducer, post oxygen sensor.Have preceding lambda sensor in former catalyst exhaust upstream, install heating type oxygen sensors additional in former catalyst exhaust downstream, i.e. post oxygen sensor is to detect the fault of catalyst; Need to install the acceleration transducer vertical with vehicle body in addition, this acceleration transducer allows with the acceleration transducer of ABS system shared, is used for closing under the condition of road difference the OBD function.At OBD diagnosis requirement, the parts or the system that can cause discharging to surpass the OBD limit value when all break down to electronic fuel injection engine have adopted corresponding diagnostic measures, comprise sensor and the test of actuator parts, system testing and controller (ECM) test.And on the basis of former engine electric-controlled (ECM) program integrated OBD self-diagnostic program, fault diagnostic program adopts modular design, and quote the TCM administrative mechanism every fault diagnosis task is managed scheduling, organically combine with every control task of former electronic fuel injection engine.
Problem to be solved in the utility model is achieved through the following technical solutions:
A kind of electronic fuel injection engine fault diagnosis system, in described engine hardware management system controller, be integrated with the fault diagnosis system module, it is characterized in that: described fault diagnosis system comprises parts test macro, system testing system and controller test system, and parts test macro, system testing system link to each other with the controller test system respectively.
Described parts test macro is included in the heating type oxygen sensors in catalyst downstream.
This electronic fuel injection engine fault diagnosis system is equipped with the acceleration transducer vertical with vehicle body.
Described acceleration transducer can be shared with the acceleration transducer with ABS system.
In described engine failure diagnosis system controller, be provided with the self diagnosis module.
Described sensor also comprises the air inlet pressure sensor (MAP) that is connected with controller with the actuator parts, air throttle jaw opening sensor (TPS), cooling-water temperature sensor (ECT), intake air temperature sensor (IAT), lambda sensor (O2S), vehicle speed sensor (VSS), cam-position sensor (CAM), crankshaft position sensor (CKP), acceleration transducer (this acceleration transducer allows with the acceleration transducer of ABS system shared), A/C pressure sensor, IACV (Idle Air Control Valve), Valve EGR, fuel injector.
Need more accurate bent axle or CMPS Camshaft Position Sensor, catch fire so that detect more accurately; Need to install the acceleration transducer of vehicle body vertical direction, this acceleration transducer allows with the acceleration transducer of ABS system shared, is used for closing the OBD function under the very poor condition of road.In addition, OBD requires to improve greatly to the computing power of truck-mounted computer hardware.Main diagnosis of described parts test and controller have the sensor and the actuator parts of the relation of inputing or outputing, and are primarily aimed at the parts circuit and test, and comprise the judgement of sensor input value rationality simultaneously; When breaking down, actuator control loops such as IGNITION CONTROL loop (EST), atomizer control loop, Valve EGR control loop, IACV (Idle Air Control Valve) can light the OBD emergency warning lamp.
Described oxygen sensor signal diagnosis is divided into response characteristic and output voltage diagnosis, and the signal response characteristic is diagnosed at preceding lambda sensor; The voltage diagnosis comprises being shorted to ground, power supply, open circuit and heating line fault at preceding lambda sensor and post oxygen sensor.
The diagnosis of described catalyst deterioration is based on the oxygen storage capacity (OSC) that detects catalyst, if catalyst has been lost oxygen storage capacity, shows catalyst deterioration.
Described controller ECM also comprises IGNITION CONTROL loop (EST), atomizer control loop, Valve EGR control loop, idle speed control valve actuator control loop, and described sensor element loop.
Integrated self-diagnosable system module among the described controller ECM.
The utlity model has following advantage:
1, the utility model can diagnostic test all can cause engine emission to surpass the electric-control system parts or the system of OBD limit value when breaking down, comprise parts test, system testing and controller (ECM) test.Main diagnosis of parts test and controller have the sensor and the actuator parts of the relation of inputing or outputing, and are primarily aimed at the parts circuit and test, and comprise the judgement of sensor input value rationality simultaneously; System testing comprises catches fire, catalyst deterioration, cooling system failure etc.; Controller (ECM/PCM) test is used to diagnose communication failure relevant with controller and memory change etc.
2 the utility model controllers (ECM) adopt modular design, quote TCM mechanism every fault diagnosis task is managed scheduling, with every control task combination of former electronic fuel injection engine.
Description of drawings
Below in conjunction with description of drawings the utility model fault diagnosis system.
Fig. 1 is the engine management system theory diagram of the utility model band OBD
Fig. 2 is the utility model catalyst deagnostic structure synoptic diagram
Fig. 3 is the utility model catalyst diagnosis synoptic diagram
Embodiment
As Fig. 1, Fig. 2, electronic fuel injection engine fault diagnosis system shown in Figure 3, this fault diagnosis system comprises parts test macro, system testing system and controller (ECM) test macro.
Specify as follows:
Electronic fuel injection engine OBD system hardware is formed as shown in Figure 1: electronic fuel injection engine OBD system need increase the sensor hardware of OBD necessity newly on former engine management system basis, as acceleration transducer, post oxygen sensor.As be installed at the heating type oxygen sensors in catalyst exhaust downstream, see shown in the accompanying drawing 2, to detect the fault of catalyst converter; Need more accurate bent axle or CMPS Camshaft Position Sensor, catch fire so that detect more accurately; Need to install the acceleration transducer of vehicle body vertical direction, allow to follow the acceleration transducer of ABS system shared, be used under the very poor condition of road, closing the OBD function.In addition, OBD requires to improve greatly to the computing power of truck-mounted computer hardware.Catch fire and the differentiation cylinder that catches fire by the variation diagnostic that detects speed of crankshaft.Concrete grammar is based on crankshaft-position signal and judges each cylinder working sequential, try to achieve the rotation instantaneous angular velocity of bent axle and carry out filtering according to detected engine rotational speed signal, (this demarcation limit value is according to engine speed and load if the bent axle instantaneous angular velocity that the crank shaft angle acceleration signal is lower than this operating point during the igniting of certain cylinder is demarcated limit value, determine by rating test), and the rotating speed average of a stroke of this cylinder is lower than the rotating speed average of whole circulation, judges that then this cylinder catches fire.
Electronic fuel injection engine OBD system diagnostics principle as shown in Figure 1: electronic fuel injection engine OBD system diagnostics content comprises parts test, system testing and controller (ECM) test.Main diagnosis of parts test and controller have the parts (sensor and driver) of the relation of inputing or outputing.When air inlet pressure sensor (MAP), air throttle jaw opening sensor (TPS), cooling-water temperature sensor (ECT), intake air temperature sensor (IAT), lambda sensor (O2S), vehicle speed sensor (VSS), cam-position sensor (CAM), bent wheel location sensor (CKP) can be lighted the OBD emergency warning lamp when breaking down.And do not light a lamp a record trouble sign indicating number when acceleration transducer, when A/C pressure sensor breaks down.
When breaking down, actuator control loops such as IGNITION CONTROL loop (EST), atomizer control loop, Valve EGR control loop, IACV (Idle Air Control Valve) can light the OBD emergency warning lamp as shown in Figure 1.And air-conditioning suction and relay, cooling fan relay fault do not influence discharging, do not put the OBD emergency warning lamp when breaking down, a record trouble sign indicating number.
The fault diagnosis of sensor and driver is primarily aimed at the parts circuit tests, comprise that simultaneously sensor input value rationality judges.System testing comprises catches fire, catalyst deterioration, cooling system failure etc.
The diagnosis principle of misfire diagnosis, the diagnosis of oxygen sensor diagnostic catalyst deterioration is as follows in the fault diagnosis functions:
(1) misfire diagnosis: when engine caught fire, crankshaft speed can be slowed down because of the do work forfeiture of ability of cylinder.Catch fire and the differentiation cylinder that catches fire by the variation diagnostic that detects speed of crankshaft.Concrete grammar is based on crankshaft-position signal and judges each cylinder working sequential, and calculation engine rotating speed, try to achieve the rotation instantaneous angular velocity of bent axle and carry out filtering, if the crank shaft angle acceleration signal is lower than the crank shaft angle acceleration demarcation limit value of this operating point during certain cylinder igniting, and the rotating speed average of a stroke of this cylinder is lower than the rotating speed average of whole circulation, judges that then this cylinder catches fire.Can cooperate simultaneously the signal output that detects lambda sensor to carry out auxiliary judgement to catching fire.
(2) oxygen sensor diagnostic as shown in Figure 2: the oxygen sensor signal diagnosis is divided into response characteristic and two aspects of output voltage diagnosis.Wherein the diagnosis of signal response characteristic its objective is in order to prevent because of the aging of lambda sensor or to poison to cause that the response of oxygen sensor signal is slack-off, thereby causes discharging to exceed standard only at preceding oxygen sensor signal.The voltage diagnosis is respectively to be shorted to ground, power supply, open circuit and heating line fault for preceding lambda sensor and all requirements of post oxygen sensor.
Lambda sensor response characteristic diagnosis mainly is the response time of detecting lambda sensor, and to be lambda sensor jump to 600mv or jump to time of 300mv from 600mv from 300mv in the definition of response time.Demarcate limit value when the response time greater than this operating point, particularly high and low voltage signal will cause exceeding standard of discharging when asymmetric.
(3) synoptic diagram of catalyst deterioration diagnosis as shown in Figure 2: 1 is catalyst among Fig. 2, and 2 is post oxygen sensor, and 3 is preceding lambda sensor, and 4 is air inlet pressure sensor, and 5 is fuel injector, and 10 is ECM.The diagnosis of catalyst 1 deterioration is based on the oxygen storage capacity (OSC) that detects converter, the catalyst downstream is installed a post oxygen sensor 2 and is helped the monitoring catalyst, by the output signal of relatively preceding lambda sensor 3 and post oxygen sensor 2, thereby the OBD system surveys the catalytic conversion fault.
Concrete diagnostic method is seen Fig. 3: oxygen sensor signal before 6 expressions among Fig. 3,7 expression post oxygen sensor signals, 8 expressions are poor retardation time, 9 represent signals by rare to dense variation.Under idling operation, change air-fuel ratio, mixer is thickened, the reaction time of 2 pairs of air-fuel ratios of observation post oxygen sensor from rare.If the time interval is demarcated limit value less than this operating point between the signal from low to high that lambda sensor 3, post oxygen sensor 2 are exported before described, then catalyst has been lost oxygen storage capacity, shows catalyst deterioration.This nominal time limit value is relevant with engine load and catalytic converter temperature.
Electronic fuel injection engine OBD system diagnostics module: the self diagnosis module among the ECM can detect the input and output signal of ECM self performance and particular system to determine whether to exist fault.Each fault type is assigned with an OBD diagnostic trouble code that contains four numerals, and diagnostic trouble code is pointed out the situation of fault.In case whether the fault of detecting will be lighted trouble light according to the character decision of fault, and diagnostic trouble code will be stored in the storer.
Carry out the different requirements of frequency according to each diagnostic task in the self-diagnostic program module, adopt the TCM scheduling mechanism diagnostic task that the various performance periods are different to be embedded in the execution branch of former engine control procedures, realized the integrated of self diagnosis task and former engine control task.The engine management system that has mated the OBD diagnostic module can be monitored the fault of parts and system at any time, and the OBD diagnostic module can continue to monitor the deterioration process of discharging, for diagnosis and maintenance with discharge relevant fault and offer help.
Claims (5)
1. electronic fuel injection engine fault diagnosis system, in described engine hardware management system controller, be integrated with the fault diagnosis system module, it is characterized in that: described fault diagnosis system comprises parts test macro, system testing system and controller test system, and parts test macro, system testing system link to each other with the controller test system respectively.
2. according to the electronic fuel injection engine fault diagnosis system of claim 1, it is characterized in that: described parts test macro is included in the heating type oxygen sensors (2) in catalyst (1) downstream.
3. according to the electronic fuel injection engine fault diagnosis system of claim 1, it is characterized in that: this electronic fuel injection engine fault diagnosis system is equipped with the acceleration transducer vertical with vehicle body.
4. according to the electronic fuel injection engine fault diagnosis system of claim 3, it is characterized in that: the acceleration transducer of described acceleration transducer and ABS system is shared.
5. according to each described electronic fuel injection engine fault diagnosis system of claim 1 to 4, it is characterized in that: described parts test macro comprises air inlet pressure sensor, air throttle jaw opening sensor, cooling-water temperature sensor, intake air temperature sensor, lambda sensor, vehicle speed sensor, cam-position sensor, crankshaft position sensor, acceleration transducer, A/C pressure sensor, IACV (Idle Air Control Valve), Valve EGR, the fuel injector that is connected with the controller test system with the system testing system.
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| CN2009202204879U CN201583406U (en) | 2009-10-29 | 2009-10-29 | Fault diagnosis system of electronic fuel injection engine |
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| CN2009202204879U CN201583406U (en) | 2009-10-29 | 2009-10-29 | Fault diagnosis system of electronic fuel injection engine |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102980777A (en) * | 2012-12-21 | 2013-03-20 | 潍柴动力股份有限公司 | Method and equipment for detecting misfiring of diesel engine based on single-cylinder angular acceleration |
| CN103063445A (en) * | 2012-12-21 | 2013-04-24 | 李萍 | On-board diagnostic (OBD) detection system used for automobile instrument |
| CN103134689A (en) * | 2011-11-23 | 2013-06-05 | 通用电气航空系统有限责任公司 | Method for diagnosing manufacturing variances |
| CN108323189A (en) * | 2017-07-14 | 2018-07-24 | 深圳市元征科技股份有限公司 | Vehicular diagnostic method, terminal device and computer readable storage medium |
| CN112304640A (en) * | 2020-10-30 | 2021-02-02 | 安徽江淮汽车集团股份有限公司 | OBD (on-board diagnostics) testing system and method |
| CN115326400A (en) * | 2022-10-13 | 2022-11-11 | 中国航发四川燃气涡轮研究院 | Fault diagnosis method of aircraft engine surge detection system and electronic equipment |
| CN117571329A (en) * | 2024-01-16 | 2024-02-20 | 金城集团有限公司 | Electronic injection working condition and fault simulation endurance test system and method for aviation |
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2009
- 2009-10-29 CN CN2009202204879U patent/CN201583406U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134689A (en) * | 2011-11-23 | 2013-06-05 | 通用电气航空系统有限责任公司 | Method for diagnosing manufacturing variances |
| CN102980777A (en) * | 2012-12-21 | 2013-03-20 | 潍柴动力股份有限公司 | Method and equipment for detecting misfiring of diesel engine based on single-cylinder angular acceleration |
| CN103063445A (en) * | 2012-12-21 | 2013-04-24 | 李萍 | On-board diagnostic (OBD) detection system used for automobile instrument |
| CN102980777B (en) * | 2012-12-21 | 2015-05-13 | 潍柴动力股份有限公司 | Method and equipment for detecting misfiring of diesel engine based on single-cylinder angular acceleration |
| CN108323189A (en) * | 2017-07-14 | 2018-07-24 | 深圳市元征科技股份有限公司 | Vehicular diagnostic method, terminal device and computer readable storage medium |
| CN112304640A (en) * | 2020-10-30 | 2021-02-02 | 安徽江淮汽车集团股份有限公司 | OBD (on-board diagnostics) testing system and method |
| CN115326400A (en) * | 2022-10-13 | 2022-11-11 | 中国航发四川燃气涡轮研究院 | Fault diagnosis method of aircraft engine surge detection system and electronic equipment |
| CN115326400B (en) * | 2022-10-13 | 2023-04-07 | 中国航发四川燃气涡轮研究院 | Fault diagnosis method of aircraft engine surge detection system and electronic equipment |
| CN117571329A (en) * | 2024-01-16 | 2024-02-20 | 金城集团有限公司 | Electronic injection working condition and fault simulation endurance test system and method for aviation |
| CN117571329B (en) * | 2024-01-16 | 2024-03-19 | 金城集团有限公司 | Electronic injection working condition and fault simulation endurance test system and method for aviation |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100915 Termination date: 20111029 |