Pressure ratio control system for a continuously variable drive

Details Pressure ratio control system for a continuously variable drive Pressure ratio control system for a continuously variable drive

1999-06-01

2000-09-12

Estremsky, Sherry L.

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

477 46, 474 28, F16H 5968

Patent

active

061170453

ABSTRACT:
A control for a continuously variable unit (CVU) provides control pressures to the variable sheave portions of the CVU pulleys. A first of the pulleys has a direct control pressure and the second of the pulleys has a control pressure proportional to the direct control pressure. The proportional pressure is established by a pair of control valves. One of the control valves issues a bias pressure, proportional to the commanded ratio in the CVU, to the other of the control valves. The other control valve communicates a sheave control pressure, proportional to or equal to the bias pressure, to the second pulley to control the relative position of the variable sheave.

REFERENCES:
patent: 4161894 (1979-07-01), Giacosa
patent: 5665022 (1997-09-01), Niiyama
patent: 5961408 (1999-10-01), Konig et al.

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