Patent ID: 9605643
Date: 2017-03-28
CPC Classifications: F01L,F02D,F02P,F23Q,Y02T

Claim:
1. An internal combustion engine leakage detection apparatus for detecting a leakage condition of an ignition plug of an internal combustion engine provided with a function of performing a cylinder resting drive, the internal combustion engine leakage detection apparatus comprising: a valve driving mechanism that drives an intake valve and an exhaust valve provided on an internal combustion engine; a fuel injection valve provided on a cylinder of the internal combustion engine; a cylinder resting control unit that instructs the valve driving mechanism and the fuel injection valve of an operation-resting cylinder to stop operation thereof when the cylinder resting drive is implemented; an ignition control unit that makes an ignition plug provided in a combustion chamber of the cylinder generate an ignition signal at least once when based on the instruction from the cylinder resting control unit, the fuel injection valve and the valve driving mechanism are stopping the operation thereof; an ignition coil device provided with an ion current detection circuit that detects an electric quantity based on an ion generated in the combustion chamber when the ignition plug is made to perform ignition discharge based on the ignition signal and an inflammable fuel-air mixture in the combustion chamber combusts due to the ignition discharge; and a plug status detection unit that detects a leakage condition of the ignition plug, wherein the plug status detection unit detects a leakage condition of the ignition plug, based on an output signal of the ion current detection circuit generated at a timing other than the timing at which the ignition coil device performs the ignition discharge.