ACCUMULATOR FUEL INJECTOR

摘要

PURPOSE: To provide an accumulator fuel injector capable of assuring a sufficient fuel pressure at the time of the initial injection of a main combustion and minimizing a fuel pressure at the time of post-injection when the post- injection is performed for increase the temperature of exhaust emission. CONSTITUTION: A common rail system having a first high-pressure accumulator and a second low pressure accumulator comprises a post injection control means for additionally injecting low pressure fuel from the second accumulator by a fuel injection nozzle after fuel is injected by a main injection control means. The post-injection control means additionally injects fuel so that the injection is completed at the time point (t1) when the fuel pressure in a fuel passage is lowered to a specified low pressure by a pressure regulating means or at the time point (t2) of completion of an exhaust stroke whichever comes earlier (S26, S28).