Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1996-12-18
1998-07-21
Marmoh, Charles A.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477159, 477143, F16H 540
Patent
active
057827117
ABSTRACT:
A hydraulic pressure control apparatus for an automatic transmission including a microprocessor-based control unit for controlling hydraulic pressure supplied to hydraulic servos of friction engagement elements. The control apparatus calculates a target hydraulic pressure P.sub.TA for a condition at the start of the inertia phase in accordance with the input torque, and a gradient based on the target hydraulic pressure and a predetermined time t.sub.TA. A first up-sweep of hydraulic pressure is performed by the apparatus with the gradient. A relatively gradual gradient .delta.P.sub.TA is set based on a target rotation change rate for the input rotational speed to provide a predetermined change amount when the hydraulic pressure becomes the target hydraulic pressure P.sub.TA. The control apparatus performs a second up-sweep with the gradient .delta.P.sub.TA. When the rotational speed change .DELTA.N of the input rotation becomes a rotation change start-determining rotational speed dN.sub.S, the control apparatus feedback-controls the hydraulic pressure with a predetermined gradient while referring to the input rotation change. Further, the control apparatus detects the target shift start time and the rotational speed change rate at the target shift start time to correct the target hydraulic pressure P.sub.TA, the gradient .delta.P.sub.TA of the second sweep section, and the target shift start time t.sub.aim.
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Hayabuchi Masahiro
Kano Toshihiro
Kubo Takayuki
Nishida Masaaki
Tsuchiya Saoto
Aisin Aw Co. Ltd.
Kwon Peter T.
Marmoh Charles A.
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