DEVICE TO REVEAL IGNITION PLUG FAULT Russian patent published in 2010 - IPC F02P19/02 F02P17/00 

FIELD: engines and pumps.

SUBSTANCE: invention relates to automotive industry. Proposed device comprises preliminary determination section, confirmation section and modification section. Ignition plug (8) is supplied by storage battery (7) in ignition period and charged by power generated by AC generator (12). Preliminary determination section defines probability of faulty operation of ignition plug proceeding from variation in AC generator output power at termination of ignition period. Probability of ignition plug fault will be determined if variation in AC generator output does not exceed check value. The latter represents a set of values intended for revealing faulty conditions of operation of ignition plug. In determining the section fault probability, confirmation section is temporarily cuts in ignition plug (8) at the end of ignition period. If AC generator output power does not exceed preset limits, generator output power variation is compared with check values "a", given ignition plug (8) is connected. If variation of generator output power does not exceed check value, ignition plug fault is considered confirmed. Proceeding from detection of faulty operation of ignition plug, modification section increases top limit of appropriate range. Confirmation section can determine check values of output power variation directly at the start of ignition plug connection or after it. Connection is considered available, if AC generator outputs sufficient power. Modified top limit represents maximum possible power output of AC generator (12).

EFFECT: valid detection of spark plug faults.

5 cl, 5 dwg