A-i-l Corporation

Eric S Brisbon

John B Cavanaugh

Jeffrey P DiCarlo

Mark Krosney

Rous S Karlson

The invention provides means for controlling the rate of fuel injection of an accumulator injector of the type employing a pressure amplifying piston assembly. In one form of the invention, the injection rate is controlled by restricting the pressure decay in the amplifier chamber. In another form of the invention, means are provided for delaying the full opening of the injector valve needle after an initial valve opening.

Rate control in accumulator type fuel injectors

In a fuel injection system having a stepper motor (40) positioning the pump rack (32) in the fuel injection pump (18) to control the end of injection, a preloaded, compliant linkage (52,54,56) is interposed between the stepper motor output pinion gear (48) and the pump rack (32) to prevent a phase shift between the actual and the desired stepper motor position. The preload of the linkage (52,54,56) is set at greater than the normal operating load and less than the stepper motor output. The linkage includes a rack member (52) that is urged by a spring-loaded mechanism (76) against the output pinion (48) of the stepper motor (40) to maintain tooth engagement, and a clevis member (56) that is pivoted to allow the rack member to move away from the pinion in the event of a pump rack load of extremely high (tooth-damaging) magnitude. A closed throttle position is assured by a spring (99) urging the single-acting linkage against a stop (98).

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Ludlow, MA, United States of America

Eric S Brisbon