Vapor recovery system with variable delay purge

Patent · Tue May 03 04:00:00 EDT 1988

OSTI ID:7007307

Yost, J V

In a vehicle fuel vapor recovery system of the type in which fuel vapors are selectively drawn from a vapor storage canister through a canister purge valve and purge line by engine manifold vacuum to be burned in the engine, the canister purge valve being activated by vacuum drawn through a control vacuum line from a control vacuum source that is exposed either to manifold vacuum or to atmosphere respectively as an engine throttle is opened or closed, a control means for activating the canister purge valve with a time delay after throttle opening that depends on how long the throttle has been closed before opening, the control means is described comprising, in combination: an air accumulator in communication with the control vacuum line to which air can be sent and from which air can be drawn, and air valve means acting in cooperation with the accumulator to restrict the drawing of air through the control vacuum line when the throttle is first opened.

• Assignee: General Motors Corp., Detroit, MI
• Patent Number(s): US 4741317
• OSTI ID: 7007307
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
ACCUMULATORS
AUTOMOTIVE FUELS
CONTAINERS
CONTROL EQUIPMENT
ENGINES
EQUIPMENT
EVAPORATION
FLOW REGULATORS
FLUIDS
FUEL SYSTEMS
FUELS
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
OPERATION
PHASE TRANSFORMATIONS
RECOVERY
TANKS
TIMING PROPERTIES
VACUUM SYSTEMS
VALVES
VAPORS