Patent ID: 7406942
Filing Date: 2008-08-05
Classification: F02B,F02D,Y02T

Abstract:
1. A direct-injection internal combustion engine, in which fuel injected into a combustion chamber during a compression stroke or an expansion stroke is mixed with intake air introduced into the combustion chamber to form an air-fuel mixture near an ignition plug, the engine comprising: a variable-exhaust-valve control device that controls the valve timing of a variable exhaust valve through which the combustion chamber of each engine cylinder communicates with an exhaust path, wherein the variable-exhaust-valve control device retards an opening timing of the variable exhaust valve when the fuel is injected during the compression stroke or the expansion stroke while the direct-injection internal combustion engine is operating in a cold-start state, wherein the variable-exhaust-valve control device controls a retard amount of the opening timing of the variable exhaust valve according to a vaporization degree of the injected fuel.