Control apparatus for transmission

Interrelated power delivery controls – including engine control – Transmission control – Continuously variable friction transmission

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Details

192 363, F16H 900

Patent

active

056741502

ABSTRACT:
For a transmission having a forward drive train, a reverse drive train and a starting clutch, a control apparatus comprises a clutch control valve for setting a clutch control pressure to control the engagement of the starting clutch and a reverse inhibitor valve for opening and closing a line to a reverse drive actuator. When the clutch control pressure increases to a value above a predetermined value, the reverse inhibitor valve closes the line to the reverse drive actuator.
For a transmission having drive and driven cylinders for controlling the speed ratio set by variable width drive and driven pulleys and a starting clutch for controlling power transmission; a control apparatus comprises a controller for judging whether or not a vehicle is in a predetermined normal forward driving mode (a driving condition which does not require a speed change or a rapid speed change), a clutch control valve for setting a clutch control pressure to control the engagement of the starting clutch, and a high pressure control valve for setting a speed-ratio changing pressure which is supplied to the drive and driven cylinders. When the vehicle is judged by the controller as being in the predetermined normal forward driving mode, the high pressure control valve corresponding to the clutch control pressure sets the speed-ratio changing pressure to a pressure lower than the pressure set while the vehicle is not in the predetermined normal forward driving mode.

REFERENCES:
patent: 4718308 (1988-01-01), Haley
patent: 4903551 (1990-02-01), Hiramatsu et al.
patent: 5007512 (1991-04-01), Petzold
patent: 5014839 (1991-05-01), Ohzono et al.
patent: 5062050 (1991-10-01), Petzold et al.
patent: 5069083 (1991-12-01), Hirano et al.
patent: 5069086 (1991-12-01), Murano et al.
patent: 5088352 (1992-02-01), Ishimaru
patent: 5170868 (1992-12-01), Yamashita et al.
patent: 5179874 (1993-01-01), Hunter
(EPO) Partial European Search Report (Application No. EP 96 10 0996) Date of Completion 24 May 1996 Examiner Van Prooijen, T. (The Hague).
English language Abstract of JP 4-243634 Aug. 1992.

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