Automatic transmission with electronically controlled torque tra

Details Automatic transmission with electronically controlled torque tra Automatic transmission with electronically controlled torque tra

1978-08-09

1980-10-21

Braun, Leslie

Machine element or mechanism

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

Preselected indexed position

74861, B60K 4106

Patent

active

042287006

ABSTRACT:
A first and second valve respectively associated with the then-present and the newly selected gear during a gear shift operation are operated with positive overlap at the beginning of the shift process if the engine is upshifting under load or downshifting under no and at the end of the shift process if the engine is upshifting under no load or downshifting under load. During the shift process the engine speed is lowered during upshift operations and increased during downshifts. The shifting process is terminated when the engine is operating synchronously with the transmission output. It is also terminated if the engine speed decreases excessive during upshifts or increases excessively during downshift or if a predetermined maximum allowable time has elapsed from the start of the shift operation. The main pressure in the gearing is decreased during the shift operation by a factor selected in accordance with the then-present operating condition.

REFERENCES:
patent: 3653281 (1972-04-01), Shirai et al.
patent: 3662625 (1972-05-01), Wakamatsu et al.
patent: 3710647 (1973-01-01), Dach et al.
patent: 3724295 (1973-04-01), Wakamatsu et al.
patent: 3732755 (1973-05-01), Beig
patent: 3898894 (1975-08-01), Aono et al.
patent: 3903759 (1975-09-01), Hashimoto
patent: 3922933 (1975-12-01), Sakai et al.
patent: 3942393 (1976-03-01), Forster et al.
patent: 4068543 (1978-01-01), Sakai et al.
patent: 4131036 (1978-12-01), Ivey
patent: 4140031 (1979-02-01), Sibend et al.

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