Control for shifting between gears of a vehicle automatic transm

Details Control for shifting between gears of a vehicle automatic transm Control for shifting between gears of a vehicle automatic transm

1985-09-04

1987-05-19

Braun, Leslie

Machine element or mechanism

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

Preselected indexed position

74867, B60K 4106

Patent

active

046657770

ABSTRACT:
A vehicle automatic transmission having a torque converter and a multiple-stage gear mechanism. When the vehicle is stopped and the shift lever is moved from the N-range to the D-range, the gear mechanism is at first shifted up to the highest gear stage and, when the converter turbine speed is decreased to a very low value, for example 200 rpm, the gear mechanism is shifted down to the first stage. If the vehicle brake is engaged and the engine is idling, the highest gear stage is maintained even after the converter turbine speed is decreased below the aforementioned value.

REFERENCES:
patent: 3752011 (1973-08-01), Casey et al.
patent: 4222292 (1980-09-01), Will et al.
patent: 4224842 (1980-09-01), Rabus et al.
patent: 4308764 (1982-01-01), Kawamoto et al.
patent: 4346626 (1982-08-01), Kawamoto
patent: 4351205 (1982-09-01), Fischer
patent: 4519273 (1985-05-01), Shimizu et al.
patent: 4539870 (1985-09-01), Sugano
patent: 4580466 (1986-04-01), Iwanaga

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