Patent ID: 7322341
Filing Date: 2008-01-29
Classification: F02D,Y02T

Abstract:
1. A control system for an internal combustion engine having fuel injection means provided in a combustion chamber of the engine for injecting fuel into the combustion chamber, the control system comprising: operating condition detecting means for detecting an operating condition of the engine; fuel injection control means for determining a fuel injection timing according to the detected engine operating condition, and executing a fuel injection through the fuel injection means; a plurality of target ignition timing storing means for storing target compression ignition timings of the fuel injected into the combustion chamber, the target compression ignition timings being set according to the operating condition of the engine; ignition timing detecting means for detecting an actual compression ignition timing of the fuel injected into the combustion chamber; target ignition timing calculating means for calculating the target compression ignition timing using the plurality of target ignition timing storing means; cetane number estimating means for calculating an ignition delay of the actual compression ignition timing with respect to the target compression ignition timing, and estimating a cetane number of the fuel according to the calculated ignition delay; and target ignition timing switching means for switching the target ignition timing storing means to be used by the target ignition timing calculating means according to the estimated cetane number.