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Control unit for a pressure regulating valve

  • US 9,864,384 B2
  • Filed: 04/19/2013
  • Issued: 01/09/2018
  • Est. Priority Date: 04/19/2012
  • Status: Active Grant
First Claim
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1. A control unit for controlling actuation of an electrically-controlled pressure regulating valve to adjust a fluid pressure of an oil conveyed by a pump, wherein the control unit provides an electrical current supply to a solenoid of the pressure regulating valve in the form of a PWM output signal based on a desired fluid pressure input signal provided to the control unit from one of a motor control or transmission control and which is indicative of a desired fluid pressure value for the oil regulated by the pressure regulating valve, wherein a temperature sensor connected to the control unit provides a fluid temperature input signal indicative of a fluid temperature of the oil, wherein the control unit is operable to initially provide a first, higher electrical current output signal to over-excite the solenoid of the pressure regulating valve and then subsequently provide a second, lower electrical current output signal that is associated with the desired fluid pressure value wherein the magnitude of the first, higher electrical current output signal is determined by the control unit based on the fluid temperature detected by the temperature sensor to render the control behavior of the pressure regulating valve constant when the determined fluid temperature of the oil is low and the viscosity of the oil is high.

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