FUEL PRESSURE CONTROL DEVICE AND FUEL PRESSURE CONTROL METHOD OF DIRECT INJECTION TYPE INTERNAL COMBUSTION ENGINE

摘要

PPROBLEM TO BE SOLVED: To prevent deterioration of exhaust characteristic by restraining fuel leaking from a fuel injection valve from being discharged from unburnt gas from an engine after stopping the engine. PSOLUTION: When an engine stop request is given, the atmosphere of a ternary catalyst provided in an exhaust passage is made lean (S130), and after that, the quantity of fuel supplied from a high pressure pump is throttled (step S150). Subsequently fuel is injected from an injector to lower the fuel pressure Pd in a delivery pipe (Step S160). The fuel discharged from the engine by fuel injection is burnt by the ternary catalyst. Accordingly, the quantity of unburnt gas from the engine 10 is restrained. PCOPYRIGHT: (C)2005,JPO&NCIPI