Claims
- 1. A method for determining an oil grade of an actuating fluid located within a fuel system, and the fuel system including a variable displacement pump, comprising the steps of:determining a temperature of the actuating fluid; determining a pump speed; determining a maximum peak pressure of the actuating fluid; and, determining an oil grade of the actuating fluid in response to the temperature of the actuating fluid, the pump speed, and the maximum peak pressure.
- 2. A method, as set forth in claim 1, wherein the step of determining the oil grade further comprises the steps of:comparing the temperature of the actuating fluid, the pump speed, and the maximum peak pressure with at least one of a plurality of pressure maps; and, determining the oil grade in response to the comparison.
- 3. A method, as set forth in claim 1, including the step of determining the maximum peak pressure in response to the pump moving from a maximum displacement position to a minimum displacement position.
- 4. A method, as set forth in claim 1, wherein the step of determining the maximum peak pressure further comprising the step of cranking the engine while determining the maximum peak pressure.
- 5. A method for determining an oil grade of an actuating fluid located within a fuel system, and the fuel system having a leakage orifice, comprising the steps of:determining a temperature of the actuating fluid; determining a pump speed; determining a maximum peak pressure of the actuating fluid; determining an oil grade of the actuating fluid in response to the temperature of the actuating fluid, the pump speed, and the maximum peak pressure.
- 6. A method, as set forth in claim 5, wherein the step of determining the oil grade further comprises the steps of:comparing the temperature of the actuating fluid, the pump speed, and the maximum peak pressure with at least one of a plurality of pressure maps; and, determining said oil grade in response to the comparison.
Parent Case Info
This is a division of application Ser. no. 09/465,571, filed Dec. 17, 1999.
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