| 摘要 |
PURPOSE:To improve a warming-up effect, to prevent increase of a warming-up time, and to improve warming-up ability, by a method wherein, even during low load running, air, passing through a blower as intake air for an increase in temperature, is sucked during warming-up. CONSTITUTION:During high load running, a throttle valve 21 is brought into a full opening state, a bypass valve 20 is in a closed state, and suction is effected by means of supercharging air pressurized by a blower 16b. During low load running, the throttle valve 21 is closed in a throttling state, and air is sucked by natural suction with the aid of a bypass valve 20 opened by means of a suction negative pressure. During warming-up in that the temperature of an engine is lower than a given value, even during low load running the throttle valve 21 is brought into a full opening state, the bypass valve 20 is in a closed state, and suction is effected by means of supercharging air, all passing the blower 16b and pressurized by the blower 16b. |
