Control unit for a pressure regulating valve
First Claim
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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Accused Products
Abstract
The invention relates to a control unit for a pressure regulating valve in a motor vehicle, preferably for a pressure regulating valve that adjusts the oil pressure, wherein a signal that corresponds to the pressure that is to be set can be transmitted to the control unit, the control unit is signal-connected on the output side to a pressure regulating valve for the fluid that is to be pressure adjusted, wherein the electrical current supply to the pressure regulating valve is provided by way of a PWM signal that is generated by means of the control unit and the control unit is embodied for the purpose of over-exciting the solenoid of the pressure regulating valve with a higher electrical current prior to influencing the pressure regulating valve with the electrical current that is associated with the pressure that is to be set for a period of time.
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Citations
22 Claims
- 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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13. A fluid control system, comprising:
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a pump configured to convey an oil to a motor or transmission; a pressure regulating valve arranged to adjust a fluid pressure of the oil conveyed by the pump, the pressure regulating valve having a solenoid; and a control unit providing an electrical current supply to the solenoid in the form of a PWM output signal; wherein a desired fluid pressure input signal is 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 is connected to the control unit and provides an fluid temperature input signal indicative of a fluid temperature of the oil regulated by the pressure regulating valve, wherein the control unit is operable to initially provide a first higher electrical current output signal to the solenoid to over-excite the solenoid and then subsequently provide a second lower electrical current output signal to the solenoid that is associated with the desired fluid pressure value of the oil, 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. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification