Carbon canister purge system

Details Carbon canister purge system Carbon canister purge system

1991-03-25

1992-05-26

Miller, Carl Stuart

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123516, F02M 3900

Patent

active

051157853

ABSTRACT:
A pulse width modulated solenoid-actuated valve and a vacuum-actuated valve for cooperatively associated such that the purge system possesses both accurate control at low purge flows and the capacity for handling much higher flows. The two valves are in parallel paths between the canister and the manifold. Below a certain duty cycle of the solenoid-actuated valve, only its path is open. At higher duty cycles, both flow paths are open. An orifice is provided in the flow path containing the solenoid-actuated valve so that as this valve increasingly opens, a vacuum signal at a tap between the orifice and the solenoid-actuated valve also increases. This vacuum signal is applied to a control port of the vacuum-actuated valve to cause the latter to open upon attainment of a certain flow through the solenoid-actuated valve.

REFERENCES:
patent: 4044743 (1977-08-01), Eaton
patent: 4086897 (1978-05-01), Tamura
patent: 4127097 (1978-11-01), Takimoto
patent: 4308842 (1982-01-01), Watanabe
patent: 4527532 (1985-07-01), Kasai
patent: 4700683 (1987-10-01), Uranishi
patent: 4703737 (1987-11-01), Cook
patent: 4741317 (1988-05-01), Yost
patent: 4951637 (1990-08-01), Cook
patent: 5069188 (1991-12-01), Cook

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