Fuel vapor treatment apparatus

Details Fuel vapor treatment apparatus Fuel vapor treatment apparatus

2008-01-15

2008-01-15

Moulis, Thomas (Department: 3747)

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

C073S118040

Reexamination Certificate

active

11398755

ABSTRACT:
A fuel vapor treatment apparatus includes a first canister, a purge passage, an atmosphere passage, a first detection passage provided with a restrictor, and a passage-changing valve for changing the connection passage of the first detection passage between the purge passage and the atmosphere passage. The apparatus further includes a second canister connecting with the first detection passage on the opposite side of the passage-changing valve across the restrictor. A differential pressure sensor detects a pressure difference between both ends of the restrictor. An ECU computes the concentration of fuel vapor on the basis of the detection result of the differential pressure sensor.

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U.S. Appl. No. 11/522,523, filed Sep. 18, 2006.

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