Evaporated fuel treatment device
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United States of America Patent
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Jan 30, 2018
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app pub date -
Oct 28, 2013
filing date -
Oct 30, 2012
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Abstract
The objective of the present invention is to provide an evaporated fuel treatment device capable of performing a function diagnosis of a sealing valve with high accuracy even if an internal combustion engine is in operation. The evaporated fuel treatment device includes a sealing valve that blocks a fuel tank from the atmosphere, a canister, a canister internal pressure detection unit, a control part that performs an instruction for opening or closing the sealing valve and controls a purge, and a diagnostic part that performs a function diagnosis of an evaporated fuel sealing system including the fuel tank, the canister, and the sealing valve. The diagnostic part performs the function diagnosis of the sealing valve based on whether or not a canister internal pressure detected by the canister internal pressure sensor varies beyond a predetermined range.
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