Timing control valve for hydromechanical fuel system

Details Timing control valve for hydromechanical fuel system Timing control valve for hydromechanical fuel system

1994-02-17

1995-06-13

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

123502, F02M 3704, F02M 700

Patent

active

054233011

ABSTRACT:
An infinitely variable hydromechanical timing valve, for a fuel supply system for an internal combustion engine, is provided with a housing having a valve seat therein, and a timing control plunger mounted for reciprocation within the housing toward and away from the valve seat. A first side of the timing control plunger is acted upon by a pressure which varies as a function of engine load while a second side of the timing control plunger is acted upon by a pressure which varies as a function of engine speed. Furthermore, the timing control plunger has an orificed flow passage therethrough, one end of which is in communication with a timing flow of fuel from the pump and an opposite end of which timing flow passage communicates with a timing fluid supply rail. As a result, a variable flow area is defined by the circumference of the orifice of the orificed flow passage through the plunger and the distance of the orifice from the valve seat as a means for controlling the pressure of the timing flow communicated to the timing fluid supply rail by a throttling of the timing flow from the pump in a manner which is a function of the pressures acting on the timing control plunger. The pressure of the timing flow from the valve can be controlled in accordance with either a fixed or variable ratio between it and the speed responsive pressure acting on the timing plunger.

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Cummins Engine Co., Inc. Bulletin No. 3379294, Entitled PT (Type H) AFC-VS Fuel Pump and Fuel Flow Mar. 1979.

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