초록 ▼

A self-calibrating method and system 10 for controlling a hydraulically operated device, such as a clutch actuator 24 in an automatic power transmission, provides a pressure switch 30 in the hydraulic circuit that provides feed-back to the controller 32 when the hydraulic fluid pressure has reached

A self-calibrating method and system 10 for controlling a hydraulically operated device, such as a clutch actuator 24 in an automatic power transmission, provides a pressure switch 30 in the hydraulic circuit that provides feed-back to the controller 32 when the hydraulic fluid pressure has reached a set point level. Pressure switch 30 provides a signal to controller 32 that allows the controller to compare the control signal at the pressure set point level with that of the calibrated curve for adjusting the calibration curve.

대표청구항 ▼

1. A method for automatically calibrating a hydraulic control system comprising the steps of:(a) providing a source of hydraulic fluid pressure; (b) supplying said hydraulic fluid pressure to an inlet of an electrically operated pressure control valve; (c) connecting an outlet of said pressure contr

1. A method for automatically calibrating a hydraulic control system comprising the steps of:(a) providing a source of hydraulic fluid pressure; (b) supplying said hydraulic fluid pressure to an inlet of an electrically operated pressure control valve; (c) connecting an outlet of said pressure control valve to a hydraulically operated actuator; (d) providing a controller with a control logic and a memory; (e) connecting said controller to said pressure control valve; (f) energizing said pressure control valve with a control signal from said controller and providing a controlled hydraulic fluid pressure through said valve outlet to said hydraulically operated actuator; and (g) sensing the pressure of said controlled hydraulic fluid pressure and at a set point level providing a signal indicative thereof to said memory of said controller and storing the same in memory; (h) measuring an amount of current to said pressure control valve required for said hydraulic fluid pressure to reach said set point level; (i) comparing said measured current with a preset value of said current as a function of pressure; and, (j) adjusting said control signal based upon a comparison of the measured current with the preset value of current for automatically calibrating the hydraulic control system.