Evaporative emission leak detection system with brushless motor

Details Evaporative emission leak detection system with brushless motor Evaporative emission leak detection system with brushless motor

2006-02-28

2006-02-28

Garber, Charles (Department: 2856)

Measuring and testing

With fluid pressure

Motor part or auxiliary

Reexamination Certificate

active

07004013

ABSTRACT:
An evaporative emission leak detection system provides for detecting a leakage of a fuel vapor evaporating in a fuel tank by using a pressure difference between an inside and outside of the fuel tank. The system includes a pump for providing the pressure difference between the inside and outside of the fuel tank, a brushless motor for operating the pump, a first passage connecting to the fuel tank, a second passage connecting to the outside of the fuel tank, and a switching device for switching connections between the pump and at least one of the first passage and the second passage. The first passage has an adsorbent for adsorbing the fuel vapor. This system ensures a long life time and high accuracy of the leak detection.

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