| 摘要 |
An evaporative fuel-processing system for an internal combustion engine includes a canister for adsorbing evaporative fuel generated in the fuel tank, a charging passage, a pressure-regulating valve for regulating pressure within the fuel tank to a predetermined value, a bypass passage, a bypass valve for opening and closing the bypass passage, a purging passage, an open-to-atmosphere passage for relieving the interior of the canister to the atmosphere, a tank system formed by a part of the charging passage on one side of the bypass valve closer to the fuel tank, inclusive of the fuel tank, and a pressure sensor for detecting pressure within the tank system. An ECU opens and closes the bypass valve at cold starting of the engine, and compares the difference between output values from the pressure sensor obtained before and after opening of the bypass valve with a predetermined value. Presence of leakage from the tank system is checked based on the result of the comparison.
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