Hydraulic pump circuit
First Claim
1. A hydraulic pump, comprising:
- a housing having a fluid inlet and a fluid outlet;
a pumping element operable to increase the pressure of fluid received through the fluid inlet and to generate a flow of pressurized fluid through the fluid outlet;
a control device operatively engaged with the pumping element to control the flow rate of the flow of pressurized fluid generated by the pumping element;
a fluid passageway connecting the control device with the fluid outlet; and
a valve disposed in the fluid passageway between the fluid outlet and the control device, the valve moveable between a first position where the valve blocks a flow of fluid relative to the fluid passageway and a second position where a flow of fluid is allowed to flow through the fluid passageway.
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Accused Products
Abstract
A hydraulic pump is provided that includes a housing having a fluid inlet and a fluid outlet. A pumping element is operable to increase the pressure of fluid received through the fluid inlet and to generate a flow of pressurized fluid through the fluid outlet. A control device is operatively engaged with the pumping element to control the flow rate of the flow of pressurized fluid generated by the pumping element. A fluid passageway connects the control device with the fluid outlet. A valve is disposed in the fluid passageway between the fluid outlet and the control valve. The valve is moveable between a first position where the valve blocks a flow of fluid relative to the fluid passageway and a second position where a flow of fluid is allowed to flow through the fluid passageway.
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Citations
20 Claims
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1. A hydraulic pump, comprising:
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a housing having a fluid inlet and a fluid outlet;
a pumping element operable to increase the pressure of fluid received through the fluid inlet and to generate a flow of pressurized fluid through the fluid outlet;
a control device operatively engaged with the pumping element to control the flow rate of the flow of pressurized fluid generated by the pumping element;
a fluid passageway connecting the control device with the fluid outlet; and
a valve disposed in the fluid passageway between the fluid outlet and the control device, the valve moveable between a first position where the valve blocks a flow of fluid relative to the fluid passageway and a second position where a flow of fluid is allowed to flow through the fluid passageway. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating a hydraulic pump, comprising:
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operating a pumping element to increase the pressure of a fluid and generate a flow of pressurized fluid to a fluid rail;
adjusting a control device to control the flow rate of the flow of pressurized fluid to the fluid rail;
directing a portion of the flow of pressurized fluid generated by the pumping element to the control device; and
closing a valve to prevent the portion of the flow of pressurized fluid from flowing to the control device when the pressure of the fluid in the fluid rail is below a predetermined limit. - View Dependent Claims (12, 13)
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14. A fuel injection system, comprising:
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a tank configured to hold a supply of fluid;
a fluid rail;
a fuel injector in fluid connection with the fluid rail; and
a hydraulic pump, including a housing having a fluid inlet in fluid communication with the tank and a fluid outlet in fluid communication with the fluid rail;
a pumping element operable to increase the pressure of fluid received through the fluid inlet and to generate a flow of pressurized fluid through the fluid outlet;
a control device operatively engaged with the pumping element to control the flow rate of the flow of pressurized fluid generated by the pumping element;
a fluid passageway connecting the control device with the fluid outlet; and
a valve disposed in the fluid passageway between the fluid outlet and the control valve, the valve moveable between a first position where the valve blocks a flow of fluid relative to the fluid passageway and a second position where a flow of fluid is allowed to flow through the fluid passageway. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification