Patent ID: 6116221
Filing Date: 2000-09-12
Classification: F02B,F02D,Y02T

Abstract:
A gasoline vapor purging system for an internal combustion engine of gasoline direct injection type, comprising:a vapor purging section which temporarily traps gasoline vapor produced in a fuel supply section of the engine and feeds the gasoline vapor through a vapor purge conduit into an intake section of the engine upon operation of the engine;an electrically actuated valve installed in said vapor purge conduit to control the flow of the gasoline vapor toward said intake section; anda control unit which controls operation of said valve so that a target purging rate of the gasoline vapor directed toward the intake section is determined based on an amount of gasoline injected to each combustion chamber of the engine through an injector and based on a predetermined relationship between gasoline amount and purging rate.wherein, when said engine operates on a stratified lean mixture, said control unit corrects said target purging rate in accordance with a target air/fuel ratio of the mixture,wherein the predetermined relationship is based in part on a particular engine operation mode.