Patent ID: 6968825
Filing Date: 2005-11-29
Classification: F01L,F02B,F02D,F02F,F02M,Y02T

Abstract:
1. A control device for a spark-ignition engine in which a mixture in a combustion chamber is fired by compression ignition in a part-load range under warm-running conditions, said control device comprising: an EGR controller for regulating the temperature in the combustion chamber at a point of the compression ignition by performing an EGR control operation in such a way that hot burned gas is left in the combustion chamber in a lower-load, lower-speed region within a compression ignition combustion range, which is an operating range in which the mixture is fired by the compression ignition, whereas cold burned gas is introduced into the combustion chamber in a higher-load, higher-speed region within the compression ignition combustion range; and a firing assist unit for inducing the compression ignition at least when ignitability of the mixture decreases as a result of introduction of the cold burned gas in the compression ignition combustion range.