Control means for vehicle automatic transmissions

Details Control means for vehicle automatic transmissions Control means for vehicle automatic transmissions

1984-05-31

1987-05-05

Braun, Leslie

Machine element or mechanism

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

Preselected indexed position

74752A, B60K 4104

Patent

active

046622470

ABSTRACT:
A vehicle automatic transmission including a torque converter and a multiple stage transmission gear mechanism. The gear mechanism is controlled through a hydraulic system having solenoid valves. An electronic control unit is provided to control the hydraulic system under a shift control map having shift up and shift down control lines. The shift down control line is determined in terms of the torque converter turbine speed and the engine throttle valve position as a line passing through points of maximum curvature on iso-engine-output-power lines as functions of the torque converter turbine speed and the engine load.

REFERENCES:
patent: 3727488 (1973-04-01), Wakamatsu et al.
patent: 4027554 (1977-06-01), Ito et al.
patent: 4208929 (1980-06-01), Heino et al.
patent: 4346627 (1982-08-01), Kawamoto et al.
patent: 4456107 (1984-06-01), Ito et al.

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