Patent ID: 6209566
Filing Date: 2001-04-03
Classification: F15B,Y10T

Abstract:
A hydraulic control system comprising a hydraulic circuit containing fluid and including a source of fluid pressure, an electrically operated valve for controlling the fluid pressure in a part of the hydraulic circuit, a pressure transducer for producing a pressure signal indicative of the fluid pressure in said part of the hydraulic circuit, and an electronic control means for supplying an electric control current to the electrically operated valve to control the electrically operated valve in response to signals from the pressure transducer, and the control current having a temperature dependent parameter;wherein the control means is also arranged to monitor said parameter of the control current thereby to monitor the temperature of the electrically operated valve, and to compensate accordingly for an effect of temperature changes on the pressure signal, the pressure transducer has an output voltage which is temperature dependent and the control means is arranged to calibrate its temperature dependence by monitoring its output voltage at times when the fluid pressure to be measured is at a known level and the temperature is at each of at least two levels.