Evaporated fuel processing device
AssigneeAisan Kogyo Kabushiki Kaisha
InventorYoshikazu Miyabe
Life of this patent
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Abstract
When a closing valve is in a closed state, a controller may determine presence of leakage from the closing valve based on: a pressure detected by a first pressure sensor and/or a pressure detected by a second pressure sensor detected when a difference between a pressure in the vapor passage upstream of the closing valve and a pressure in the vapor passage downstream of the closing valve is a first difference; and the pressure detected by the first pressure sensor and/or the pressure detected by the second pressure sensor detected when the difference is a second difference different from the first difference.
Claims4
An evaporated fuel processing device comprising:
- a fuel tank;
- a vapor passage through which evaporated fuel generated from fuel in the fuel tank flows;
- a closing valve configured to open and close the vapor passage;
- a first pressure sensor configured to detect a pressure in the vapor passage upstream of the closing valve directly or indirectly;
- and/or a second pressure sensor configured to detect a pressure in the vapor passage downstream of the closing valve directly or indirectly;
- and
- a controller,
- wherein
- when the closing valve is in a closed state, the controller determines presence of leakage from the closing valve based on:
- the pressure detected by the first pressure sensor and/or the pressure detected by the second pressure sensor detected when a difference between the pressure in the vapor passage upstream of the closing valve and the pressure in the vapor passage downstream of the closing valve is a first difference;
- and
- the pressure detected by the first pressure sensor and/or the pressure detected by the second pressure sensor detected when the difference is a second difference different from the first difference.
Dependencies are inferred from the claim text.