Patent ID: 9435707
Filing Date: 2016-09-06
CPC Classification: F02D,F02P,G01L,Y02T

Claim Text:
1. A fault diagnostic device for intra-cylinder pressure sensor that outputs a value corresponding to an intra-cylinder pressure of an internal combustion engine, wherein the fault diagnostic device is configured to: delay ignition timing so that firing timing comes after a compression top dead center to generate a peak of the intra-cylinder pressure before firing and a peak of the intra-cylinder pressure after firing; detect at least one of an output value of the intra-cylinder pressure sensor in the peak of the intra-cylinder pressure before firing (hereinafter, called a pre-firing output peak value) and a crank angle thereof, after the ignition timing is delayed by the fault diagnostic device; and diagnose presence or absence of a fault of the intra-cylinder pressure sensor by using at least one of the pre-firing output peak value and the crank angle thereof.