FUEL INJECTION CONTROL UNIT FOR IN-CYLINDER INJECTION TYPE SPARK IGNITION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide a fuel injection control unit for an in-cylinder injection type spark ignition engine free from back fire. SOLUTION: An engine 10 is provided with a main fuel injection valve 21 for injecting fuel directly into a combustion chamber 14 and an auxiliary fuel injection valve 26 for injecting fuel into a surge tank 12 comprising an intake passage 11. When the engine starts and temperature of cooling water is at a prescribed degree or less, fuel is injected from the auxiliary fuel injection valve 26 as well as from the main fuel injection valve 21. An electronic control device 32 prohibits fuel injection from the auxiliary fuel injection valve 26 and increases the fuel injection volume from the main fuel injection valve 21 when the engine started and a throttle valve opening is at prescribed degree or more.