Hydraulic control apparatus for automatic transmission

Details Hydraulic control apparatus for automatic transmission Hydraulic control apparatus for automatic transmission

2007-08-28

2007-08-28

Ho, Ha D. (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

C477S120000, C477S158000

Reexamination Certificate

active

11081748

ABSTRACT:
A hydraulic control apparatus for an automatic transmission provided with a friction engaging element that operates using hydraulic pressure includes a range pressure oil passage which is connected to the friction engaging element; a manual valve which is connected to the range pressure oil passage; a drain port which is formed in the manual valve and which drains hydraulic pressure of the range pressure oil passage; a drain oil passage which is connected to the drain port; and a drain pressure controller which is connected to the drain oil passage and which performs control so as to change a decreasing rate of drain pressure of the drain oil passage.

REFERENCES:
patent: A 07-019326 (1995-01-01), None

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