Device for detecting leakage of fuel vapor
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTakayuki Otsuka
Life of this patent
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Abstract
A device for detecting leakage of fuel vapor including a pressure sensor which is arranged in a fuel vapor conduit connected to the fuel tank. The pressure sensor detects the pressure inside the fuel tank. It is judged that the fuel vapor has not leaked from the fuel tank or the fuel vapor conduit before the engine is stopped based on the pressure inside the fuel tank detected by the pressure sensor and it is judged that the reattachment of the fuel cap has been forgotten when it is judged that the fuel vapor is leaking from the fuel tank when the operation of the engine is restarted after stopping of the engine.
Claims16
A device for detecting a leakage of fuel vapor from a fuel tank or a conduit connected to the fuel tank for use with an engine, the device comprising
- a pressure detecting means for detecting a pressure in the fuel tank;
- a first judgement means for judging if fuel vapor was leaking from the fuel tank or the conduit connected to the fuel tank before the engine was stopped based on the pressure in the fuel tank;
- a second judgement means for judging if fuel vapor has leaked from the fuel tank or the conduit connected to the fuel tank when engine operation is restarted after the engine has stopped based on the pressure in the fuel tank;
- and
- a forgotten fuel cap reattachment judgement means for judging that reattachment of the fuel cap of the fuel tank has been forgotten when it is judged by the first judgement means that the fuel vapor has not leaked and it is judged by the second judgement means that the fuel vapor is leaking.
Dependencies are inferred from the claim text.