Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1998-05-15
1999-08-10
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel injection system
123467, 123463, F02M 3704
Patent
active
059342510
ABSTRACT:
A fuel system damper includes a damper diaphragm, a damper spring, a vacuum bias diaphragm, and a vacuum bias spring. The damper spring is biased between the damper diaphragm and the vacuum bias diaphragm, and the vacuum bias spring is biased against the vacuum bias diaphragm in the top chamber of the damper. A bottom chamber below the damper diaphragm is open to allow fuel from the fuel rail into the chamber so that the damper diaphragm can respond to pressure pulsations in the fuel. The top chamber has an opening that communicates with an engine intake manifold so that when engine intake manifold pressure decreases to very low levels, the vacuum bias diaphragm will travel up. This upward motion reduces the pressure in the fuel rail by removing load from the damper spring. When the pressure regulation setpoint is reached, the regulator will supply fuel to maintain pressure.
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Miller Carl S.
Siemens Automotive Corporation
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