Control device for hydraulic system of a continuously variable t

Details Control device for hydraulic system of a continuously variable t Control device for hydraulic system of a continuously variable t

1997-09-11

2000-07-11

Marmor, Charles A

Interrelated power delivery controls, including engine control

Clutch control

With fluid drive

477175, B60K 4102

Patent

active

06086513&

ABSTRACT:
In a fluid pressure control system for a continuously variable transmission, a valve for regulating a torque converter pressure is a pilot actuated valve having a pressure increasing side pilot port for receiving a control pilot pressure for controlling a line pressure and a pressure decreasing side pilot port for receiving a second pilot pressure. A selector valve is switched between a first state for allowing the supply of the second pilot pressure to decrease the torque converter pressure supplied to the torque converter and a second state for draining the second pilot pressure to increase the torque converter pressure. By controlling the selector valve, a control unit increases the torque converter pressure in a wide throttle high speed vehicle operation with the torque converter in a lockup state to ensure the lockup engagement and in a wide throttle starting operation with the torque converter in a non-lockup state to prevent an engine stall. Otherwise, the control system decreases the torque converter pressure to improve the fuel economy.

REFERENCES:
patent: 4623053 (1986-11-01), Nishikawa
patent: 5607373 (1997-03-01), Ochiai et al.
patent: 5637053 (1997-06-01), Droste et al.
patent: 5667458 (1997-09-01), Narita et al.
patent: 5697866 (1997-12-01), Okahara
patent: 5782718 (1998-07-01), Wakahara

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