Method of calibrating a solenoid operated pressure control valve and method of controlling same

Abstract

A method of calibrating a solenoid operated pressure control valve by sweeping the solenoid with increasing current from a minimum to a maximum and measuring and recording the signal pressure output and current at selected increments of current and storing the data pairs in a first table. The solenoid is similarly swept with decreasing current from the maximum to a minimum and the signal output pressure measured at selected increments of current and the data pairs stored in a second table. Upon installation of the valve in an hydraulic system to be controlled, the commanded signal pressure output Pc, if greater than the instantaneous signal pressure output P2 is compared with the closest data pairs in the first table and, by interpolation, the required solenoid energization current Ie determined. If the commanded signal pressure output Pc is less than the instantaneous signal pressure P2 is compared with the closest data pair in the second table and, by interpolation, the required solenoid energization current Ie determined.

Dependencies are inferred from the claim text.