Method for estimating pressure in a pressure actuated controller

Details Method for estimating pressure in a pressure actuated controller Method for estimating pressure in a pressure actuated controller

1994-10-27

1996-09-03

Ballato, Josie

Fluid-pressure and analogous brake systems

Speed-controlled

Brake force or pressure determined from speed sensors

303DIG4, B60T 842

Patent

active

055517706

ABSTRACT:
A method for estimating hydraulic pressure in a control system that includes hydraulic pressure actuators (28,30) remotely situated with respect to a pressure source (14) wherein pressure at the remote location can be estimated thereby eliminating the need for using pressure transducers to obtain a pressure signal for use in an electronic controller (86,90,142) based on a calibratable relationship between estimated brake pressure and the difference in the volume of fluid flowing toward the pressure actuator and from the pressure actuator. An effective duty cycle for a solenoid operated fluid flow control valve (60,62) in the actuator circuit is determined in accordance with an empirical relationship between the difference between (i) the estimated brake pressure and the supply pressure and (ii) a commanded duty cycle.

REFERENCES:
patent: 4749239 (1988-06-01), Onogi et al.
patent: 4800498 (1989-01-01), Matsui et al.
patent: 4828334 (1989-05-01), Salman
patent: 4912641 (1990-03-01), Kuwana et al.
patent: 4975852 (1990-12-01), Fennel et al.
patent: 5150298 (1992-09-01), Fujioka et al.
patent: 5348380 (1994-09-01), Korasiak et al.

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