Fuel injection apparatus and method for direct injection type engines

摘要

An improved controller for controlling fuel injection in an internal combustion engine. The engine includes a fuel injection valve for directly injecting fuel into a combustion chamber. A fuel pressure sensor detects the fuel pressure within the injection valve. An ECU computes opening time of the injection valve and closing time of the injection valve based on a required fuel injection amount. The ECU computes a reference time at which the pressure in the combustion chamber reaches the injection pressure of the injection valve based on the detected fuel pressure. If necessary, the ECU advances the computed opening time and the computed closing time. As a result, the fuel injection from the injection valve is finished before the reference time. This prevents matter inside the combustion chamber from entering the fuel injection valve, and it guarantees that fuel will be able to exit the fuel injection valve during injection.