Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1995-12-27
1997-09-02
Ta, Khoi Q.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477143, F16H 6126
Patent
active
056625502
ABSTRACT:
If there is a need to accelerate abruptly, or shift a speed stage from a fourth speed stage to a second speed stage, to accomplish a skip shift from the fourth speed stage to the second speed stage without going via a third speed stage and, therefore, enhance the shift-responsiveness and the power performance, a high-low pressure valve which is connected to a fourth friction pressure line in the third and fourth speed stages is duty controlled by a damper clutch solenoid valve to vary a line pressure in a pressure regulating valve with the operation of a damper clutch, and a shift valve is controlled to a drive pressure passage and a third speed line pressure by controlling a first and second pressure control solenoid valves to enable the skip shift, and by supplying a first friction element with the operation pressure at times of the second to the third speed stage shifting, after the shifting to the third speed stage, when the operation pressure for the fourth friction element is supplied to a releasing valve for the fourth friction element, the operation pressure of the first friction element is exhausted.
REFERENCES:
patent: 5014577 (1991-05-01), Takada et al.
patent: 5565000 (1996-10-01), Jang
patent: 5565001 (1996-10-01), Sakai et al.
Hyundai Motor Company
Ta Khoi Q.
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