Acceleration-based control of power-on downshifting in an automa

Details Acceleration-based control of power-on downshifting in an automa Acceleration-based control of power-on downshifting in an automa

1990-10-24

1992-01-14

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

74867, 74 85, 192109F, B60K 4108

Patent

active

050799703

ABSTRACT:
A power-on clutch-to-clutch downshift control is initiated by partially releasing an off-going torque trasmitting device to permit an increase in the transmission input speed. At the same time, an on-coming torque transmitting device is filled in preparation for engagement. When the slip across the on-coming device is near zero, the on-coming device pressure is progressively increased while the off-going clutch pressure is controlled to maintain the near-zero on-coming slip speed condition. When the on-coming device develops significant capacity, a tie-up develops between the on-coming and off-going devices, causing a drop in output shaft acceleration. The drop is detected and used to release the off-going device, the shift being complete when the on-coming device is fully engaged. Engine torque controls are employed to ensure a smooth output torque transition at the end of the shift.

REFERENCES:
patent: 3956947 (1976-05-01), Leising et al.
patent: 4338832 (1982-07-01), Pelligrino
patent: 4476748 (1984-10-01), Morscheck
patent: 4653351 (1987-03-01), Downs et al.
patent: 4796490 (1989-01-01), Butts et al.
patent: 4905545 (1990-03-01), Leising et al.

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