| 摘要 |
An intake system of an internal combustion engine includes a surge tank communicating with cylinders of the engine via individual intake paths, a vacuum tank connected to the surge tank, a valve that permits or inhibits communication between the surge tank and the vacuum tank, and a control unit that controls opening and closing of the valve. The control unit executes the steps of: (a) opening the valve to communicate the surge tank with the vacuum tank when the surge tank is held in a negative-pressure condition during operation of the engine, and closing the valve upon a lapse of a predetermined period of time so as to hold the vacuum tank in a negative-pressure condition, (b) opening the valve for a predetermined period of time when a condition for starting the engine is satisfied, so as to reduce the pressure in the surge tank, and (c) closing the valve when the engine is started.
|
