Control system for a four-speed automatic transmission

Details Control system for a four-speed automatic transmission Control system for a four-speed automatic transmission

1985-09-18

1987-09-08

Braun, Leslie

Machine element or mechanism

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

Preselected indexed position

74867, 74866, B60K 4118, B60K 4116

Patent

active

046915974

ABSTRACT:
Control device of an automatic transmission having four forward speeds with shifting under torque together with a hydrokinetic torque converter with an integrated torsional damper, and one reverse speed, of the type comprising a planetary gear train controlled by three clutches and two brakes with hydraulic control. A hydraulic distributor controlled by four solenoid valves selectively feeds the clutches and brakes, depending on the running conditions of the vehicle. The control means of the solenoid valves are made to use two states of one of these solenoid valves to allow fast filling and progressiveness of the active receiver or receivers during shifting and two states of the other solenoid valves to assure the various sequences during shifting.

REFERENCES:
patent: 3487851 (1970-01-01), Golan et al.
patent: 3505909 (1970-04-01), Maurice
patent: 3902380 (1975-09-01), Murakami
patent: 4006652 (1977-02-01), Murakami
patent: 4290324 (1981-09-01), Aubert et al.
patent: 4331044 (1982-05-01), Bookout et al.
patent: 4354236 (1982-10-01), Aisin-Warner
patent: 4422536 (1983-12-01), Shatuck
patent: 4555964 (1985-12-01), Sugano

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