To realize a smooth and comfortable deceleration feeling, by properly controlling three members of a throttle, a phase variable mechanism and an operating angle variable mechanism, when decelerating a vehicle.
The throttle 27 for opening-closing an intake passage, the operating angle variable mechanism capable of varying the size of an operating angle of an intake valve, and the phase variable mechanism capable of varying the central phase, are provided for adjusting a suction air quantity. In the initial stage of decelerating the vehicle, first of all, throttle opening is reduced; the operating angle of the intake valve is increased; and the central phase is delayed. Then, in the intermediate stage of deceleration, opening of the throttle 27 is increased, and the operating angle of the intake valve is reduced. Then, in the final stage of deceleration, the opening of the throttle 27 is increased; the central phase is advanced; and the closing timing of the intake valve is advanced.
COPYRIGHT: (C)2005,JPO&NCIPI
Katsuhiro Arai
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Hiromichi Kobayashi
Tomioka Kiyoshi