Fault diagnosis method for air intake system of engine, device and fault diagnosis system

Abstract

The invention belongs to the technical field of engine fault diagnosis and discloses a fault diagnosis method for the air intake system of an engine. The fault diagnosis method of the air intake system of the engine includes the following steps that: an air intake manifold pressure standard is obtained; an air intake pressure effective value is collected in real time; the air intake pressure effective value is compared with the air intake manifold pressure standard, so that the working state of the air intake system can be judged; and if the air intake pressure effective value is within the range of the limit value of the air intake manifold pressure standard, it is determined that the working state of the air intake system is normal. The invention also discloses a fault diagnosis device for the air intake system of an engine and an engine fault diagnosis system. According to the fault diagnosis method for the air intake system of the engine provided by the present invention, the existing parameters of the engine are acquired, so that whether the pressure of the air intake system is normal or not can be judged, fault diagnosis can be performed on the air intake system of the engineaccurately and quickly without a road test required to be performed, and therefore, the diagnostic work hours of a service station and the probability of misdiagnosis of the service station can be greatly decreased.

Description

technical field [0001] The invention relates to the technical field of engine fault diagnosis, in particular to a fault diagnosis method for an engine intake system, a fault diagnosis device for an engine intake system, and an engine fault diagnosis system including the fault diagnosis device for an engine intake system. Background technique [0002] At present, the diagnosis of the function of the intake system of the vehicle engine is still based on the empirical diagnosis of the service station. According to the existing service station maintenance methods, common methods can be classified into two categories: replacement method and road test method. [0003] Replacement method: It means that the service station replaces one of the old parts with a new part or replaces several old parts in sequence according to the user's complaint description, and then observes whether the engine returns to normal operation, so as to determine whether the cause of the failure is found. ...

AI Technical Summary

Problems solved by technology

However, due to complex road conditions and variable vehicle operating conditions, it is difficult to give a unified and objective road test test standard in the experiment of limited road sections, so that the road test cannot accurately determine whether the engine failure is caused by the failure of the intake system

And this road test method has a great potential safety hazard to a certain extent.

Images