Isuzu Motors Limited

Hiroshi Usuba

Nobuyuki Iwao

A device for controlling a power transmission device for a vehicle, which, at the time of gearshift, so controls the engine as to rotate at a target rotational speed, wherein at the time of shifting the gear up, a target value properly corresponding to an actual vehicle speed is set to quickly increase the engine output and to shorten the time for shifting the gear. In controlling the engine at the time of shifting the gear up, a target engine rotational speed is set based the signals from, wheel rotational speed detector means that detects the rotational speed of a wheel, such as an anti-lock control device. Thus, the target engine rotational speed is set depending properly upon an actual vehicle speed that varies accompanying an increase in the amount of engaging the clutch at the time of gearshift, and the gear at the time of accelerating the vehicle can be quickly shifted up without accompanied by the shift shock. At the time of shift-down, a target engine rotational speed is set based on an actual vehicle speed found from the signals of the transmission input shaft rotational speed.

Device for controlling a power transmission device of a vehicle at the time of gearshift

A power transmission device for a vehicle having a clutchbetween an engineand a transmission, preventing variation in the engine torque and shift shock when the engine control mode returns from an engine control at the time of shifting back to an accelerator pedal follow-up control for normal traveling. Timer meansis provided for a clutch control devicethat executes the control for disengaging the clutchat the time of shifting and engaging it after the completion of the shifting. The timer meanscontrols a moment for starting the clutch engagement control depending on the engine conditions, etc. The state of increasing the amount of clutch engagement varies and the state of engine rotational speed varies, too. When the engine control at the time of shifting is returned back to the accelerator pedal follow-up control at the time of normal traveling, therefore, the engine can be placed in a condition where the engine torque does not vary despite the control mode is changed over.

Growing community of inventors

Kanagawa, Japan

Hiroshi Usuba