Clutch-to-clutch power-on downshifting in a motor vehicle automa

Details Clutch-to-clutch power-on downshifting in a motor vehicle automa Clutch-to-clutch power-on downshifting in a motor vehicle automa

1986-02-12

1987-03-31

Braun, Leslie

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74869, B60K 4118, B60K 4116

Patent

active

046533516

ABSTRACT:
A clutch-to-clutch power-on downshift in a motor vehicle automatic transmission is effected by reducing the torque capacity of the off-going clutching device to permit the transmission input speed to increase toward a target speed which it will finally attain subsequent to the shift; increasing the torque capacity of the off-going clutching device and preparing the on-coming clutching device when the input speed approaches its target speed so that the input speed is held near the target speed by the time the on-coming clutching device is prepared to transmit torque; and concurrently applying and releasing the on-coming and off-going clutching device to complete the shift. Since the input speed is substantially at its target value when the exchange of clutching devices occurs, a high quality shift with minimal driveline torque disruption results.

REFERENCES:
patent: 3656373 (1972-04-01), Shimosaki
patent: 3688608 (1972-09-01), Leach
patent: 3752011 (1973-08-01), Casey et al.
patent: 3855880 (1974-12-01), Ishimaru et al.
patent: 4034627 (1977-07-01), Mizote
patent: 4422350 (1983-12-01), Myller et al.
patent: 4476747 (1984-10-01), Kawamoto
patent: 4497222 (1985-02-01), Nagaoka et al.

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