Lock-up clutch control device for a multi-speed automatic transm

Details Lock-up clutch control device for a multi-speed automatic transm Lock-up clutch control device for a multi-speed automatic transm

1986-03-31

1987-10-06

Krizmanich, George H.

Machine element or mechanism

Gearing

With fluid drive

74752C, 192 0076, 192 331, F16H 4700, F16H 5710

Patent

active

046974741

ABSTRACT:
A lock-up clutch control device for an automatic transmission having a torque converter with a lock-up clutch and a speed changing gear mechanism including a sub-transmission unit and a main transmission unit. The device has a lock-up operation device for producing a control signal when the sub-transmission unit is in the higher speed mode or when the main transmission unit selects 2nd or a higher speed gear. The control signal is delivered to a lock-up relay valve which operates effectively while it receives the control signal. Therefore, the torque converter can be locked up at 2nd or higher speeds of the automatic transmission which, because of various combinations of the states of the sub-transmission and main transmission units, outputs multiple speed.

REFERENCES:
patent: 4349088 (1982-09-01), Ito et al.
patent: 4367812 (1983-01-01), Kobayashi et al.
patent: 4512212 (1985-04-01), Ishikawa
patent: 4588059 (1986-05-01), Miki et al.

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