Fuel injector with multiple variable timing

Details Fuel injector with multiple variable timing Fuel injector with multiple variable timing

1989-01-19

1991-07-23

Miller, Carl Stuart

Internal-combustion engines

Charge forming device

With fuel pump

123501, 123446, 239 95, F02M 3900

Patent

active

050334425

ABSTRACT:
A fuel injector having both stepped and infinitely variable timing is disclosed. The fuel injector includes an injector housing and a plunger wherein the plunger includes an axial bore formed in the top of the plunger. A plunger top is mounted within the axial bore and is translatable between an upper position and a lower position. A coil spring having a predetermined spring rate is disposed in the axial bore for biasing the plunger top in the upper position. An upper and a lower piston are disposed above the plunger and are translatable within the injector housing. A timing chamber is formed between the upper piston and the lower piston. When the timing chamber contains timing fluid, the fluid serves as a hydraulic link between the upper and lower pistons and the fuel injector operates at a first level of advanced timing. When the timing fluid creates a force on said lower piston which is greater that the force created by the coil spring, the plunger top is pushed toward the lower position to operate the fuel injector at a second level of advanced timing. The second level of advanced timing is more advanced that the first level of advanced timing and may be infinitely variable.

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patent: 4410138 (1983-10-01), Peters et al.
patent: 4419977 (1983-12-01), Hillebrand
patent: 4427152 (1984-01-01), Sisson
patent: 4463901 (1984-08-01), Perr et al.

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