Patent ID: 6029622
Filing Date: 2000-02-29
Classification: F02D,Y02T

Abstract:
A fuel control system for a cylinder injection type internal combustion engine, comprising:intake air flow sensing means for detecting an intake air flow fed to said internal combustion engine;crank angle sensing means for detecting rotation speed (rpm) of said internal combustion engine and a crank angle thereof;fuel injection, means installed in each of cylinders of said internal combustion engine for injecting fuel directly into each of said cylinders;exhaust gas recirculation means for regulating quantity of exhaust gas recirculated from an exhaust passageway of said internal combustion engine to an intake passageway thereof; andelectronic control unit for arithmetically determining control quantities for said fuel injection means and said exhaust gas recirculation means, respectively, on the basis of detection information derived from outputs of said intake air flow sensing means and said crank angle sensing means, respectively;wherein when fuel injection mode of said internal combustion engine is changed over from a compression-stroke fuel injection mode for realizing a high air-fuel ratio to a suction-stroke fuel injection mode for realizing a low air-fuel ratio, said electronic control unit changes control quantity for said exhaust gas recirculation means prior to the other control quantities for said suction-stroke fuel injection mode.