Exhaust gas recirculation system assembly flow diagnosis method for electronic fuel injection management system of gasoline engine
A technology of recirculation system and management system, which is applied in the direction of mechanical equipment, engine components, engine control, etc., to achieve the effect of ensuring reliable performance
Active Publication Date: 2015-07-08
UNITED AUTOMOTIVE ELECTRONICS SYST
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a method for diagnosing the flow rate of the exhaust gas recirculation system assembly of the gasoline engine EFI management system, which can still effectively realize the exhaust gas flow rate of the gasoline engine EFI management system when the engine throttle body is seriously polluted. Recirculation System Assembly Flow Diagnosis
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[0020] In order to solve the risk of misdiagnosis in the current gasoline engine electronic injection management system in the process of flow diagnosis of exhaust gas recirculation parts assembly. like figure 1 As shown, the present invention provides a flow diagnostic logic and diagnostic strategy that completely eliminates EGR system component assembly flow misdiagnosis caused by contaminated engine throttle bodies. The flow diagnosis of the exhaust gas recirculation part assembly has two diagnostic function modes under different working conditions of fuel cut-off and fuel supply respectively.
[0021] The logic principle of the EGR system assembly flow diagnosis function under the engine oil supply condition: the strategy of executing the EGR assembly flow diagnosis strategy under the vehicle fuel supply state, in other words, the exhaust gas recirculation is carried out under the steady state driving state of the vehicle Assembly flow diagnosis; when the engine is fueled...
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The invention discloses an exhaust gas recirculation system assembly flow diagnosis method for an electronic fuel injection management system of a gasoline engine, which comprises exhaust gas recirculation system assembly flow diagnosis under the condition that the engine supplies oil and exhaust gas recirculation system assembly flow diagnosis under the condition that the engine stops supplying the oil. In each driving cycle, if any one diagnosis is finished and is qualified, the comprehensive diagnosis is finished, and in the driving cycle, the system does not execute other diagnosis; in each driving cycle, if the single diagnosis is logically reported of an error, the system executes the other diagnosis, and if the other diagnosis is also reported of an error, the system judges that the exhaust gas recirculation flow fails, and the comprehensive diagnosis is finished; and if the other diagnosis is not reported of an error, the system judges that the exhaust gas recirculation flow does not fail, and the comprehensive diagnosis is finished. The exhaust gas recirculation system assembly flow diagnosis method for the electronic fuel injection management system of the gasoline engine has the beneficial effect that under the situation that a throttle body of the engine is seriously polluted, the exhaust gas recirculation system assembly flow diagnosis for the electronic fuel injection management system of the gasoline engine is effectively realized.
Description
technical field [0001] The invention relates to a diagnostic method for a gasoline engine electronic injection management system. Background technique [0002] The core of the existing gasoline engine electronic injection management system for the EGR assembly flow diagnosis of the exhaust gas recirculation system is to rely on the deviation between the actual measured value of the intake manifold pressure and the pressure model value. The intake manifold pressure model value is the pressure value calculated and simulated by the EFI system according to the actual working conditions of the vehicle; the actual intake manifold pressure value is obtained directly from the actual measurement of the pressure sensor. Under normal circumstances, the deviation between the pressure model value and the measured value is small, usually around 15hpa; and when the exhaust gas recirculation component assembly is clogged, the measured value of the manifold pressure will be relatively reduce...
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IPC IPC(8): F02B77/08F02D21/08
Inventor 张振宇张容波
Owner UNITED AUTOMOTIVE ELECTRONICS SYST