Creep torque and lock-up control for automatic transmission

Details Creep torque and lock-up control for automatic transmission Creep torque and lock-up control for automatic transmission

1986-10-23

1988-04-05

Wright, Dirk

Machine element or mechanism

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

Preselected indexed position

74867, 74868, B60K 4112, B60K 4118

Patent

active

047351136

ABSTRACT:
A control device for an automatic transmission comprises an electromagnetic valve that is subject to pulse duty factor control and generates an adjustment pressure variable in a first pattern after a rod of a shift operation mechanism has moved into an overstroke range beyond a maximum reduction ratio position. The adjustment pressure is variable in a second pattern when the rod fails to move into the overstroke range. An adjustment pressure change-over valve is formed integral with the rod and applies the adjustment pressure to a servo actuating pressure regulator valve (i.e., a throttle valve) when the motor vehicle is at a standstill and the engine idles so as to effect a creep torque control. When the motor vehicle starts moving at a speed above a certain vehicle speed, the adjustment pressure change-over valve applies the adjustment pressure to a lock-up control valve, thereby to effect a lock-up control.

REFERENCES:
patent: 4090417 (1978-05-01), Burcz et al.
patent: 4428259 (1984-01-01), Kubo et al.
patent: 4431096 (1984-02-01), Kobayashi et al.
patent: 4432255 (1984-02-01), Borman et al.
patent: 4468988 (1984-09-01), Hiramatsu
patent: 4478105 (1984-10-01), Yamamuro et al.
patent: 4526065 (1985-07-01), Rosen et al.
patent: 4542665 (1985-09-01), Yamamuro et al.
patent: 4559850 (1985-12-01), Sakakibara
patent: 4561328 (1985-12-01), Hiramatsu
patent: 4579021 (1986-04-01), Yamamuro et al.
patent: 4588059 (1986-05-01), Miki et al.

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