Gm Global Technolgoy Operations, Inc.

Richard G Grundman

Richard S Knape

Russell Harmon Bosch

Michael James Seino

An electrically controlled hydraulic actuated fuel injector wherein the amount of return fuel flow is substantially reduced without adversely affecting injection valve operation. An improved control valve armature valve disk of faster acting construction is also included. In one embodiment, dual pressurizing passages of differing diameters provide lower total fuel flow to a control chamber than the outflow through a depressurizing passage controlled by a control valve. Upon full opening of the injection valve, all return fuel flow is supplied to the control chamber through the smaller pressurizing passage, thereby reducing the requirement for pressure fuel flow. Upon closing of the control valve, cutting off discharge through the depressurizing passage, both of the dual pressurizing passages help fill the control chamber to quickly close the injection valve. The improved control valve armature is a small magnetically responsive disk fixed to a metal guide shim having a periphery clamped in the injector housing. Integral fingers of the shim are fixed to the disk, guiding its opening and closing motion free from rubbing on the housing. The fingers lie near the periphery of the shim and disk, allowing room for fuel flow between the disk and an associated solenoid to which the disk is attracted when the control valve is open. Hydraulic resistance to closing of the control valve is thus reduced.

Direct acting fuel injector

A fuel injection pump assembly in which fuel delivered from individual cam lobe driven pump plungers is controlled by an engine driven drive shaft rotated control valve, the position of which, relative to the spill ports from the plungers, is controlled by means of a hydraulic governor. A separate governor cam lobe is used to also actuate the plungers whereby fluid supplied to the hydraulic governor is at a flow rate proportional to pump speed and therefore, engine speed.

Fuel injection pump

A system for controlling pressure of a fluid, specifically the pressure of servo oil delivered to a clutch which determines the torque transmitted by the clutch. The system includes a pump, a pressure regulating valve to provide servo oil at constant pressure from the pump, and a pilot valve controlled by a solenoid responsive to electric current to vary the pressure in a pilot fluid line supplied from the constant pressure line. The oil is delivered from the fixed pressure line to the clutch by a throttling flow control servo valve which can open for rapid filling of the clutch cylinder. This valve is biased to close by the delivered pressure and biased to open by the pilot pressure. It may also be biased to close by a spring, and in this case be restrained from completely closing, so that the valve assumes its minimum area when the delivered pressure is slightly less than the pilot pressure. The clutch supply line is connected to the pump inlet through a by-pass servo valve which opens when the delivered pressure exceeds the pilot pressure, thus equalizing the delivered pressure with the pilot pressure. This valve also provides for rapid emptying of the clutch cylinder.

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Coopersville, MI, United States of America

Richard G Grundman