Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Reexamination Certificate
2006-01-10
2006-01-10
Mohanty, Bibhu (Department: 3747)
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
Reexamination Certificate
active
06983739
ABSTRACT:
The present invention provides an evaporative fuel control system for an internal combustion engine. In this system, a canister is disposed on an evaporative fuel control passage that connects an intake passage of the engine with a fuel tank to absorb the evaporative fuel. An atmosphere open passage connects the canister with the atmospheric air. A purge valve is located between the intake passage and the canister for a purge control of the evaporative fuel generated in the fuel tank and absorbed by the canister. This system includes a switching valve, a reference pressure detecting means, a pressure reducing means, a leak diagnosis means, and a failure determination means. The switching valve communicates/shuts the atmosphere open air passage with/to the atmosphere. The pressure reducing means vacuums or reduces the pressure inside of the evaporative fuel control system. The leak diagnosis means diagnoses leakage within the evaporative fuel control system by using a reduced pressure in the evaporative fuel control system which is reduced by the pressure reducing means when the switching valve is shifted to shut the atmospheric air, and a reference pressure detected by the reference pressure detecting means. The failure determination means determines that the switching valve is in a state of failure by using a pressure variation when shifting of the switching valve for the leak diagnosis.
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Flynn ,Thiel, Boutell & Tanis, P.C.
Mohanty Bibhu
Suzuki Motor Corporation
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