PROTECTION DEVICE FOR LIMITING PUMP CAVITATION IN COMMON RAIL SYSTEM
First Claim
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1. A fuel system for an internal combustion engine comprising:
- a fuel supply;
a common rail;
a fuel pump coupled with the fuel supply and structured to pressurize a fuel from the fuel supply for conveying to the common rail;
a plurality of fuel injectors coupled with the common rail and structured to inject the fuel into a plurality of cylinders in an internal combustion engine; and
a pump protection device structured to drain pressurized fuel from the common rail to provide a fuel flow through the fuel pump that limits cavitation within the fuel pump, the pump protection device including a valve body having an inlet fluidly connected with the common rail, a drain outlet, and a valve mechanism positioned within the valve body fluidly between the inlet and the outlet;
the valve mechanism including a first valve member movable between a closed position inhibiting fluid flow through the inlet, and an open position, and a second valve member movable between a closed position inhibiting fluid flow through the outlet, and an open position, and at least one biaser biasing the first valve member and the second valve member toward the closed position and the open position, respectively.
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Abstract
A pressurized fuel system for an engine includes a fuel pump in a pump protection device structured to drain pressurized fuel from a common rail to provide fuel flow through the fuel pump that limits cavitation. The device includes a valve mechanism having a first valve and a second valve that are movable to an open position and a closed position respectively, in response to valve opening and valve closing rail pressures. The active pressure range of the device may be a medium pressure range.
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Citations
20 Claims
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1. A fuel system for an internal combustion engine comprising:
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a fuel supply; a common rail; a fuel pump coupled with the fuel supply and structured to pressurize a fuel from the fuel supply for conveying to the common rail; a plurality of fuel injectors coupled with the common rail and structured to inject the fuel into a plurality of cylinders in an internal combustion engine; and a pump protection device structured to drain pressurized fuel from the common rail to provide a fuel flow through the fuel pump that limits cavitation within the fuel pump, the pump protection device including a valve body having an inlet fluidly connected with the common rail, a drain outlet, and a valve mechanism positioned within the valve body fluidly between the inlet and the outlet; the valve mechanism including a first valve member movable between a closed position inhibiting fluid flow through the inlet, and an open position, and a second valve member movable between a closed position inhibiting fluid flow through the outlet, and an open position, and at least one biaser biasing the first valve member and the second valve member toward the closed position and the open position, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A pump protection device for limiting cavitation in a pump in a fuel system comprising:
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a valve body having an inlet structured to fluidly connect with a common rail in a fuel system, and a drain outlet; a valve mechanism positioned within the valve body fluidly between the inlet and the drain outlet; the valve mechanism including a first valve member movable between a closed position in contact with a first valve seat within the valve body to inhibit fluid flow through the inlet, and an open position, and a second valve member movable between a closed position in contact with a second valve seat within the valve body to inhibit fluid flow through the drain outlet, and an open position; and the valve mechanism further including at least one biaser biasing the first valve member and the second valve member toward the closed position and the open position, respectively. - View Dependent Claims (11, 12, 13, 14)
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15. A method of operating a pressurized fluid system comprising:
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supplying pressurized fluid at a valve opening pressure to a first valve in a pump cavitation protection device fluidly connected with a common rail; opening the first valve in response to the supplying of the pressurized fluid at the valve opening pressure, such that the pressurized fluid is drained from the common rail to produce a fluid flow through a pump supplying the pressurized fluid to the common rail that limits cavitation within the pump; supplying pressurized fluid at a valve closing pressure greater than the valve opening pressure to a second valve in the pump cavitation protection device; and closing the second valve in response to the supplying of the pressurized fluid at the valve closing pressure such that the draining of the pressurized fluid is stopped. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification