EGR flow fault judgment method, device and equipment

Abstract

The embodiment of the invention provides an EGR flow fault judgment method, device and equipment, and the method comprises the steps: determining a correction coefficient according to an NOx emissionset value and an NOx emission measurement value of a target engine; obtaining a target deviation threshold value according to the correction coefficient and a preset deviation threshold value; according to a measured quantity of a flow parameter of the target engine and a set quantity of the flow parameter, determining the deviation of the flow parameter, wherein the flow parameter comprises at least one of a gas inflow amount and a waste gas amount; judging whether the EGR of the target engine has a flow fault or not according to the deviation of the flow parameter and the target deviation threshold value, wherein the judgment of the EGR flow fault considers NOx emission of the engine and further considers the influence of boundary conditions on the emission change of an original engine,so that the problem of false alarm or false report caused by inaccurate judgment of the EGR flow fault in the prior art is solved, and the fault monitoring robustness is improved.

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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