Evaporative fuel treatment apparatus

Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system

Reexamination Certificate

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C123S1980DA

Reexamination Certificate

active

07426919

ABSTRACT:
An evaporative fuel treatment apparatus is disclosed that includes a fuel tank and a purge passage that fluidly couples the intake path of an internal combustion engine and the fuel tank. The apparatus also includes a purge valve that is installed in the purge passage and controls the quantity of evaporative fuel purged from the fuel tank into the intake path. Furthermore, the apparatus includes an evaporative fuel status measuring device that measures a density-based status of evaporative fuel in the fuel tank. Additionally, the apparatus includes a purge valve controlling device that controls the purge valve based on the density-based status of the evaporative fuel measured by the evaporative fuel status measuring device.

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