Carbon canister purge system

Details Carbon canister purge system Carbon canister purge system

F - Mech Eng,Light,Heat,Weapons

02

M

F02M 25/08 (2006.01)

Patent

CA 2081917

2081917 9117353 PCTABS00008 A pulse width modulated solenoid-actuated valve (12) and a vacuum-actuated valve (14) are 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 (46) is provided in the flow path containing the solenoid-actuated valve so that as this valve increasingly opens, a vacuum signal at a tap (44) between the orifice and the solenoid-actuated valve also increases. This vacuum signal is applied to a control port (34) of the vacuum-actuated valve to cause the latter to open upon attainment of a certain flow through the solenoid-actuated valve.

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