Patent ID: 7421999
Filing Date: 2008-09-09
Classification: F02B,F02D,F02M

Abstract:
1. A control apparatus for an internal combustion engine, the internal combustion engine capable of a pre-mixed charge compression ignition combustion and having fuel injection means for injecting fuel into a combustion chamber defined by a cylinder and a piston, wherein air-fuel mixture gas including at least air and fuel injected by the fuel injection means is formed in the combustion chamber and the air-fuel mixture gas is self-ignited to be combusted by compressing the air-fuel mixture gas during a compression stroke, when a driving condition of the engine is within a self-ignition area, comprising: temperature un-uniformity adding means for acting on the air-fuel mixture gas to enhance temperature un-uniformity of the air-fuel mixture gas at a predetermined acting timing which is within a middle phase of the compression stroke and prior to fuel pyrolysis starting timing, if the compression stroke is divided into an early phase of the compression stroke, the middle phase of the compression stroke, and a late phase of the compression stroke, the early phase of the compression stroke being a period in which mixing of the air-fuel mixture gas proceeds rapidly due to a turbulent flow in the combustion chamber, the middle phase of the compression stroke being a period in which the mixing of the air-fuel mixture gas proceeds relatively moderately and a the combustion reaction becomes more active gradually, and the late phase of the compression stroke being a period in which an explosive combustion reaction occurs, in such a manner that the temperature un-uniformity of the air-fuel mixture gas at the fuel pyrolysis starting timing which is within a compression stroke is made greater than temperature un-uniformity of the air-fuel mixture gas at the fuel pyrolysis starting timing obtained only by simply compressing the air-fuel mixture gas during the compression stroke, and so that the combustion is more moderate than combustion which occurs only by simply compressing the air-fuel mixture gas during the compression stroke.