Timing control for fuel pump

Details Timing control for fuel pump Timing control for fuel pump

F - Mech Eng,Light,Heat,Weapons

02

M

123/119

F02M 59/20 (2006.01)

Patent

CA 1078279

ABSTRACT OF THE DISCLOSURE A fuel injection pump including a charge pump for delivering discrete pulses of high pressure liquid fuel se- quentially to the several cylinders of an associated engine is provided with an angularly adjustable cam ring to control the timing of the pumping strokes. The position of the cam ring is controlled by an advance piston, the position of which is controlled by a hydraulic pressure correlates with engine speed. A load sensing piston, engageable with one end of the advance piston above a fixed amount of timing advance, is subjected to the pressure of the metered fuel downstream of the metering valve which controls the quantity of fuel delivered by the pump to urge the advance piston in a direction to retard the timing of the pumping strokes to result in a timing control system in which the timing is more advanced at high speeds and light load than it is at high speeds and full load. -1-

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