Injection valve fault diagnosis method, system and equipment and storage medium

Abstract

The embodiments of the invention provide an injection valve fault diagnosis method, system and equipment and a storage medium. The injection valve fault diagnosis method comprises the steps that when a vehicle is in a first state, the actual value of the excess air coefficient of the vehicle is obtained, whether the actual value of the excess air coefficient is within a first preset interval or not is judged, if yes, all injection valves are sequentially closed so that the actual value of the excess air coefficient can be located outside the first preset interval, after the condition that all the injection valves are closed is obtained, in the process that the actual value of the excess air coefficient is recovered to the first preset interval again, the corresponding relation between the maximum value and the injection valves is established according to the maximum value of the actual value of the excess air coefficient, and the fault of the target injection valve is determined through the maximum value and the average value. Under the condition that an engine is not disassembled, the fault of the injection valve of the engine can be accurately diagnosed, and the general applicability is high.

Description

technical field [0001] The invention relates to the field of engine detection, in particular to an injection valve fault diagnosis method, system, equipment and storage medium. Background technique [0002] During the use of the engine injection valve, there is a deviation between the actual gas flow and the required flow due to wear, sticking, foreign matter blockage, etc., which affects engine performance and even causes safety accidents. [0003] At present, for the fault diagnosis of the injection valve, it is usually to collect the first rail pressure of the gas rail before the injection valve is opened and the second rail pressure after the engine has been running for a period of time, and obtain the difference between the first rail pressure and the second rail pressure The rail pressure drop value is compared with the preset drop threshold value to judge whether there is a fault in the injection valve. [0004] However, because each component of the gas pipeline has...

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Problems solved by technology

[0004] However, due to the influence of each part of the gas pipeline on the air pressure value, there is a risk of misdiagnosis in fault diagnosis based solely on pressure changes

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