egr flow fault judgment method, device and equipment

Abstract

The embodiment of the present application provides a method, device and equipment for EGR flow failure judgment, the method includes: determining the correction coefficient according to the NOx emission setting value and the NOx emission measurement value of the target engine; according to the correction coefficient and the preset deviation threshold , to obtain the target deviation threshold; according to the measured amount of the flow parameter of the target engine and the set amount of the flow parameter, determine the deviation of the flow parameter, wherein the flow parameter includes the amount of intake air and exhaust gas At least one; according to the deviation of the flow parameter and the target deviation threshold, it is judged whether there is a flow fault in the EGR of the target engine, wherein the judgment of the EGR flow fault takes into account the NOx emission of the engine, and then considers the boundary conditions The impact on the emission change of the original machine solves the problem of inaccurate judgment of EGR flow faults in the prior art, resulting in false alarms or false alarms, and improves the robustness of fault monitoring.

Description

technical field [0001] The embodiments of the present application relate to the technical field of vehicles, and in particular to a method, device and equipment for judging a flow fault of an exhaust gas recirculation (EGR for short). Background technique [0002] With the continuous development of the economy, vehicles have become an important means of transportation for people to travel. Vehicles bring convenience to people, but exhaust emissions from vehicles pollute the environment. The vehicle can return part of the exhaust gas from the engine to the intake manifold through the EGR device of the engine, and mix it with fresh air and enter the cylinder again. Due to the large amount of CO contained in the exhaust gas 2 These gases can absorb a large amount of heat and reduce the maximum combustion temperature of the mixture in the cylinder, thereby reducing the generation of nitrogen oxides and reducing environmental pollution. Excessive EGR flow will affect engine pe...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present application provides a method, device and equipment for judging EGR flow faults, so as to solve the problem of inaccurate judgment of EGR flow faults in the prior art, resulting in false positives or false positives.

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