Method of controlling automatic transmission

Details Method of controlling automatic transmission Method of controlling automatic transmission

1984-12-24

1987-08-04

Staab, Lawrence

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

192 0073, 192 009, F16D 2310, F16D 2104

Patent

active

046839968

ABSTRACT:
A method of controlling a synchromesh type automatic transmission of a vehicle such as an automobile, including the steps of releasing a clutch for connecting an engine and the transmission in response to a speed change command, shifting the transmission from one speed position to a neutral position, shifting the transmission from the neutral position to a subsequent speed position, and applying the clutch. The double-clutching operation is conducted if a load upon synchronization during the speed changing operation exceeds a predetermined level, to once apply the clutch and subsequently release the clutch again while the transmission is in the neutral position. Thus, the synchronization load can be dropped to prevent any so-called "under-synchronization" in the transmission. The synchronization load is detected in terms of the difference between the r.p.m. of the input shaft of the transmission and the product of the vehicle speed or the r.p.m. of the output shaft of the transmission and the reduction ratio.

REFERENCES:
patent: 3548980 (1970-12-01), Schmidt
patent: 3756358 (1973-09-01), Espenschied et al.
patent: 3834499 (1974-10-01), Candellero et al.
patent: 4061217 (1977-12-01), Toyota et al.
patent: 4172505 (1979-10-01), Rabus et al.
patent: 4289222 (1981-09-01), Esthimer
patent: 4344513 (1982-08-01), Etienne
patent: 4361060 (1982-11-01), Smyth

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