Patent ID: 6810320
Filing Date: 2004-10-26
Classification: F02D,F02P,Y02T

Abstract:
An apparatus for diagnosing and controlling combustion of an internal combustion engine in which fuel gas is mixed with air and burned in a combustion chamber, comprising:a cylinder pressure detector for detecting the pressure in the combustion chamber, a means for calculating the ratio of the maximum cylinder pressure Pp to the compression pressure or pressures P0 at one or a plurality of predetermined crank angle in the compression stroke, which ratio Pp/P0 is the maximum pressure ratio from cylinder pressure detected by said cylinder pressure detector, a means for comparing the maximum pressure ratio Pp/P0 with pressure ratios predetermined stepwise for each category of diagnosis, each of said pressure ratios being hereafter referred to as a threshold pressure ratio, and a means for diagnosing a condition of combustion in the combustion chamber by judging the result of comparison.