| 摘要 |
PURPOSE:To accelerate fuel atomization under a low temperature state without deteriorating intake efficiency in an engine provided with a sub-intake passage having a sub-fuel injection valve arranged parallelly to a main intake passage having a main fuel injection valve. CONSTITUTION:A sub-intake passage 14 which has a sub-chamber 14A and an opening/ closing valve 16 is arranged parallelly to a main intake passage 11 as an auxiliary fuel supply device in an internal combustion engine 1 provided with a main fuel injection valve 17 in the main intake passage 11. A sub-fuel injection valve 15 and a PTC heater 18 opposed thereto are provided as a part of a wall surface in the sub-chamber A. In addition, an engine temperature sensor 9 is provided. By a control circuit 10 which control them, the opening/closing valve 16 is opened under the low temperature state of the engine, and at the same time injection is performed from the sub-fuel injection valve 15 and current carrying to the PTC heater 18 is performed. The valve 16 is closed under the high temperature state of the engine, at the same time injection from the sub-fuel injection valve 15 and current carrying to the PTC heater 18 are stopped. Fuel atomization is accelerated in a low temperature state while improving intake efficiency. Injection from the main fuel injection valve 17 is possible even under a low temperature state of the engine. |
