Coast-sync-coast downshift control method for clutch-to-clutch t

Details Coast-sync-coast downshift control method for clutch-to-clutch t Coast-sync-coast downshift control method for clutch-to-clutch t

1990-10-23

1991-08-06

Herrmann, Allan D.

Machine element or mechanism

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

Preselected indexed position

74867, 74868, 74869, 3644241, 192 0092, B60K 4106

Patent

active

050367293

ABSTRACT:
A coast-sync-coast control method for clutch-to-clutch shifting in which an engine control is employed to synchronize the engine speed with the transmission input speed at a point where the input speed would otherwise exceed the engine speed. The shift is referred to as a coast-sync-coast shift since (1) it is initiated at a coast condition where the input speed is higher than the engine speed, (2) it is completed at a synchronous condition where the speed differential across the on-coming clutch is at or near zero, and (3) a coast condition recurs immediately after the shift.

REFERENCES:
patent: 4653350 (1987-03-01), Downs et al.
patent: 4653351 (1987-03-01), Downs et al.
patent: 4671139 (1987-06-01), Downs et al.
patent: 4706522 (1987-11-01), Nitz
patent: 4707789 (1987-11-01), Downs et al.
patent: 4796490 (1989-01-01), Butts et al.
patent: 4856383 (1989-08-01), Rosen
patent: 4891759 (1990-01-01), Kato

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