Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1998-12-16
1999-12-28
Ta, Khoi Q.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477116, 477117, F16H 6108
Patent
active
060074574
ABSTRACT:
A hydraulic control system for automatic transmissions includes a pressure control valve for regulating hydraulic pressure generated by a hydraulic pump to line pressure, a manual valve for converting the line pressure from the pressure control valve into drive pressure, a solenoid supply valve for reducing the line pressure from the pressure control valve, a torque control regulator valve controlled by the reduced pressure from the solenoid supply valve to convert the drive pressure from the manual valve into torque pressure that is lower than the drive pressure, and a shift valve for supplying the torque pressure from the torque control regulator valve to friction elements during an initial stage of a shift operation, then replacing the torque pressure with the drive pressure from the manual valve at an end of the shift operation. The hydraulic control system further includes a third speed friction element control clutch valve for supplying the torque pressure from the torque control regulator valve to a third speed friction element which is engaged in a third speed of a drive range at an initial 4-3 shifting operation, then replacing the torque converter fed to the third speed friction element with the line pressure from the pressure control valve at an end of the 4-3 shifting operation, whereby shift shock is reduced.
REFERENCES:
patent: 5558599 (1996-09-01), Tsukamoto et al.
patent: 5800309 (1998-09-01), Takiguchi et al.
patent: 5810693 (1998-09-01), Nakayama et al.
patent: 5813941 (1998-09-01), Jang
patent: 5842951 (1998-12-01), Yasue et al.
patent: 5876303 (1999-03-01), Yu
patent: 5887483 (1999-03-01), Ohashi et al.
patent: 5895334 (1999-04-01), Yu
Hyundai Motor Company
Ta Khoi Q.
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