Apparatus for controlling gearshifts in automatic transmission u

Details Apparatus for controlling gearshifts in automatic transmission u Apparatus for controlling gearshifts in automatic transmission u

1989-08-04

1991-06-04

Herrmann, Allan D.

Machine element or mechanism

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

Preselected indexed position

F16H 5914, F16H 5946, F16H 5974

Patent

active

050203916

ABSTRACT:
If the accelerator pedal condition is a power-on condition and the gearshift type is an upshift, or the accelerator pedal condition is a power-off condition and the gearshift type is a downshift, then a torque for engaging the next-gear-position gearshift means is established based on the engine torque to be transmitted from the engine to the next-gear-position gearshift means, and an inertia torque required to make the rotational speed of the input member of the next-gear-position gearshift means vary as desired with respect to the gearshift. If the accelerator pedal condition is a power-on condition and the gearshift type is a downshift, or the accelerator pedal condition is a power-off condition and the gearshift is an upshift, then the ratio between the rotational speeds of the input and output members of the next-gear-position gearshift means is detected. The torque for engaging the next-gear-position gearshift means is lowered after the gearshift is started until the detected rotational speed ratio reaches a predetermined value. After the detected rotational speed ratio has reached the predetermined value, the engaging torque is set to a vaslue large enough to engage the gearshift means.

REFERENCES:
patent: 4506563 (1985-03-01), Hiramatsu
patent: 4627312 (1986-12-01), Fujieda et al.
patent: 4653351 (1987-03-01), Downs et al.
patent: 4727472 (1988-02-01), Deutsch
patent: 4817470 (1989-04-01), Muller et al.
patent: 4875391 (1989-10-01), Leising et al.
patent: 4893526 (1990-01-01), Tokoro
patent: 4922624 (1990-05-01), Hiramatsu

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