Patent ID: 7308887
Filing Date: 2007-12-18
Classification: F02D,Y02T

Abstract:
1. A controller for a direct-injection internal combustion engine in which fuel is directly injected into a combustion chamber of a cylinder via a fuel injection valve, and a mixture formed thereby is burned by igniting the mixture via an ignition plug, which controller controls fuel injection timing of the fuel injection valve, the controller comprising: an injection-time-point restriction device that, after initial combustion at the time of engine startup under very low temperature conditions, restricts a fuel-injection start time point and a fuel-injection end time point to within a period of time during which smoldering of the ignition plug is less prone to occur, to warm up the inside of the cylinder and increase engine speed; and an injection-timing adjustment device that adjusts a fuel injection period from the injection start time point to the injection end time point by elongating the fuel injection period by reducing the restriction on the injection start time point to the injection end time point in response to increase in the engine speed.