Fuel vapor leakage detection method

Patent metadata

Field	Value
Publication number	US-9303600-B2
Application number	US-201314050411-A
Country	US
Kind code	B2
Filing date	Oct 10, 2013
Priority date	Oct 11, 2012
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

A fuel vapor leakage detection device performs a fuel vapor leakage detection method to detect a clogging of passages in an evaporated fuel processing system by (i) switching a switching valve after measuring a first reference pressure, (ii) determining whether a detected pressure equals atmospheric pressure after opening a purge valve, (iii) recording the detected pressure after closing the purge valve, and (iv) switching the switching valve to depressurize an atmospheric system and to determine whether a current detection value of the pressure sensor is the same as the first reference pressure. Then, a second reference pressure is measured for comparison with the first reference pressure, to determine whether the evaporation system is clogged. In such manner, leakage and the clogging of the passages in an evaporated fuel processing system may be detected.

First claim

What is claimed is:

1. A fuel vapor leakage detection device, comprising:
a canister connection passage connected to a canister that absorbs a fuel vapor in a fuel tank;
an air passage for allowing fluid communication between the canister connection passage and atmosphere;
a pressure detection passage for allowing fluid communication with the canister connection passage;
a switching valve selectively switching fluid communication of the canister connection passage with one o…

Assignees

• Denso Corp

Inventors

• Kato Yasuo

Classifications

• F02M25/0854 Primary

  Mechanical Engineering · mapped topic

• F02M25/0818 Primary

  Mechanical Engineering · mapped topic