Clutch control method and device for vehicle with automatic tran

Details Clutch control method and device for vehicle with automatic tran Clutch control method and device for vehicle with automatic tran

1995-11-29

1997-08-12

Bonck, Rodney H.

Interrelated power delivery controls, including engine control

Clutch control

477175, 477181, B60K 4102

Patent

active

056559968

ABSTRACT:
In the fuel cut state during deceleration, an actual vehicle speed Vs is compared with a target vehicle speed Vso when the direct coupling state is changed into a semi-coupling state, or otherwise an actual engine rotational speed Ne is compared with a return engine rotational speed Neo at the return from fuel cut. Then, if Vs.ltoreq.Vso or Ne.ltoreq.Neo+K (K is a positive predetermined value), the clutch is changed from the direct coupling state into the semi-coupling state. Thus, shock due to torque change at the time of return from fuel cut can be reduced, and during the coast down, the fuel cut state can be maintained until the low rotational speed is attained. Both improvement of fuel economy and efficient use of engine brake can be attained. Engine stall can be prevented at the time of abrupt braking.

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patent: 5489012 (1996-02-01), Buckley et al.
patent: 5490815 (1996-02-01), Kato et al.

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