Vorrichtung und Verfahren zum Einspritzen von Brennstoff bei Brennkraftmaschinen mit Direkteinspritzung

摘要

An improved apparatus and method for controlling fuel injection in an internal combustion engine. The engine includes main-injection valves (11) for directly injecting fuel into corresponding combustion chambers (5) and a sub-injection valve (12) for injecting fuel into a surge tank (16). The engine is able to perform a plurality of fuel injection modes. An ECU (30) selects a homogeneous fuel injection mode (A, B), in which the injected fuel is evenly mixed with air supplied into the combustion chamber (5), from the plurality of fuel injection modes when the engine is being cranked and fuel injected from the main-injection valve (11) will not adequately vaporize in the combustion chamber (5). The ECU (30) controls the first and second injection valves (11, 12) according to the selected fuel injection mode. This improves engine starting and increases fuel efficiency.