Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1995-07-31
1997-01-14
Wright, Dirk
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477908, B60K 4106, F16H 6126, F16H 6300
Patent
active
055933653
ABSTRACT:
A control system for an automatic transmission including a main transmission unit for setting a reverse stage and a plurality of forward stages and an auxiliary transmission unit connected in series to the main transmission unit and capable to be changed between two higher and lower stages. The control system comprises: a solenoid valve for outputting a signal pressure when at least the reverse stage and a predetermined one of the forward stages are to be set; a change-over valve for changing the signal pressure selectively into a signal pressure for setting the auxiliary transmission unit to a high gear stage and a signal pressure for controlling an engine braking state; and an engine braking control valve for controlling an engine braking frictional element at the predetermined forward stage into a released state in response to the signal pressure coming from the change-over valve. The acting state of the solenoid valve when the reverse stage is to be set and the acting state of the solenoid valve when the predetermined forward stage for making the engine braking ineffective is to be set are identical to each other.
REFERENCES:
patent: 4765203 (1988-08-01), Sugano
patent: 5351577 (1994-10-01), Ando et al.
Ando Masahiko
Fukatsu Akira
Hayabuchi Masahiro
Hojo Yasuo
Kasuga Shinji
Aishin A.W. Co., Ltd.
Toyota Jidosha & Kabushiki Kaisha
Wright Dirk
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