[Retracted] Fault Diagnosis of Automobile Engine Based on Improved BP Neutral Network

Table 1

Relationship between common fault sites and fault causes of gasoline engines.

Fault phenomena	Starting difficulty	Sometimes stall	Backfire when accelerating	Idle is unstable or stalled	Idle speed is too high	To gasp or accelerate weakly	Explosive shock	The temperature of gasoline engine is too high	The exhaust muffler blasts the gun
Fault causes
Idle or idle control valve fault	√		√	√	√				√
Ignition coil fault	√	√		√		√
Improper ignition timing	√	√	√	√	√	√	√	√	√
The spark plug fault	√	√		√		√	√		√
The openness sensor fault			√	√	√	√			√
Throttle fault or intake pipe leakage	√		√	√	√	√			√
The air filter fault
The fuel injector fault
Fuel supply system fault				√		√
The air flow sensor fault	√		√	√	√	√			√
Intake pipe absolute pressure problem or temperature sensor fault	√	√		√	√	√
Oxygen sensor fault	√		√	√	√			√
Crankshaft position sensor fault			√	√					√
Cooling or lubrication system fault								√
Cylinder carbon accumulation				√		√	√	√
Battery without power	√