| 摘要 |
PURPOSE:To be able to operate an engine with appropriate air fuel ratio all the time, and to return to feed back control of air fuel ratio smoothly by stopping fuel supply to at least one cylinder feed back control of fuel amount due to air fuel ratio when a command to drop output of the engine is received. CONSTITUTION:When a command to drop output is issued to a controller 10, some of fuel injection valves 2a-2d is are controlled and fuel supply to said some cylinder(s) is/are stopped. Meanwhile, feed back control by an air fuel ratio sensor 9 is also stopped to be switched to fuel control by an open loop. Therefore, there is no inconvenience based on output of the air fuel ratio sensor 9 such as feed back correcting value reaches the upper limit or the sensor 9 supplys rich fuel to an operating cylinder by judging as lean, and an engine is always operated with appropriate air fuel ratio.
|
