ROBUST DIRECT INJECTION FUEL PUMP SYSTEM

摘要

FIELD: internal combustion engines.;SUBSTANCE: invention can be used in fuel management systems for internal combustion engines. Proposed method for a port fuel direct injection (PFDI) engine may comprise, during a first condition, comprising direct-injecting fuel to the PFDI engine, estimating a fuel vapor pressure, and setting a fuel lift pump pressure greater than the fuel vapor pressure by a threshold pressure difference, and during a second condition, comprising port-fuel-injecting fuel to the PFDI engine, setting a direct injection (DI) fuel pump duty cycle to a threshold duty cycle without supplying fuel to a DI fuel rail.;EFFECT: technical result is increased service life of the direct injection pump and increased fuel supply stability.;20 cl, 8 dwg