Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1977-05-19
1980-06-03
Jordan, Charles T.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
123136, F02M 3900, F02M 5900
Patent
active
042056489
ABSTRACT:
A fuel circuit for an internal combustion engine comprising an electric motor driven control pump which is speed controlled by means of electronic control circuitry to precisely meter fuel to the induction air passage of the engine for mixture with induction air to achieve a desired fuel-air ratio. System performance is improved by causing the electric motor to run at a higher speed at engine idle than required to satisfy engine idle speed fuel demand by providing a return circuit from the outlet of the control pump to the tank. The return circuit is closed until the pump develops a predetermined minimum outlet pressure after which it opens to divert a portion of the pump output back to the tank via the return circuit. The return circuit is open at engine idle; however, as the engine fuel demand increases, the return circuit progressively restricts the return flow. In one embodiment, the return circuit closes at a predetermined outlet pressure somewhat below maximum pressure. By so restricting return flow, the pump and motor do not have to be oversized to satisfy maximum engine fuel demand. The preferred embodiments utilize special poppet type valves in the return circuit.
REFERENCES:
patent: 2401883 (1946-06-01), Pugh et al.
patent: 2410774 (1946-11-01), Chandler
patent: 2747555 (1956-05-01), Brunner
patent: 3669081 (1972-06-01), Monpetit
patent: 3935851 (1976-02-01), Wright et al.
patent: 4048964 (1977-09-01), Kissel
Chrysler Corporation
Jordan Charles T.
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