Fuel injection with pulse rate shaping cam

Internal-combustion engines – Charge forming device – Fuel injection system


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F02M 4100




A fuel distributing pump for a multi-cylinders, internal combustion engine having a sinuously profiled cam member providing a plurality of discrete compound cam pumping stations, each comprising primary and auxiliary cams serially arranged and interconnected by an intermediate cam segment which cooperate with pumping plungers of a pump rotor to shape and vary the pulse waves of fuel delivered to the combustion chambers for varying engine operations. For low horsepower requirements, such as idle and light loads, only the primary cam with fast initial pumping rate and following low rate camming ramps or surfaces are utilized to shape the pulse wave with a fast beginning and a graduated end of injection for even and progressive fuel burn for reducing smoke and engine noise. For higher engine loads, the primary cam, the interconnecting cam segment and a large part of the auxiliary cam are employed for a fast beginning and end of injection for shaping and increasing the quantities of fuel in the pulse waves pumped for effective high horsepower operation with cleaner exhaust.

patent: 3433159 (1969-03-01), Kemp
patent: 4377139 (1983-03-01), Jarrett et al.
patent: 4468179 (1984-08-01), Fenne et al.
patent: 4470760 (1984-09-01), Jerrett et al.
patent: 4493621 (1985-01-01), Fenne et al.
patent: 4757795 (1988-07-01), Kelly
patent: 5094216 (1992-03-01), Miyaki et al.
patent: 5103792 (1992-04-01), Winkler et al.


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