Failure detection device for evaporative fuel purge system
First Claim
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1. A failure detection device for an evaporative fuel purge system for an internal combustion engine comprising:
- a canister for containing an adsorbent for adsorbing a fuel vapor;
a vapor passage connecting the canister to a fuel tank, for introducing a fuel vapor in the fuel tank to the canister;
a purge passage connecting the canister to an intake line of the internal combustion engine for introducing the fuel vapor adsorbed by the adsorbent in the canister to the intake line;
a bypass passage for directly connecting the vapor passage and the purge passage;
detection means provided in one of the purge passage and the vapor passage for detecting the pressure therein; and
judging means for judging that a failure has occurred when the detection means detects a pressure higher than a predetermined pressure while the fuel vapor is purged to the intake line of the internal combustion engine.
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Abstract
A failure detection device that detects a failure occurring in an evaporative fuel purge system by detecting the pressure inside a vapor passage and a purge passage. The vapor passage and the purge passage are connected via a bypass passage. A pressure sensor is connected to either the vapor passage or the purge passage. An engine control unit is provided which judges that a failure has occurred in the evaporative fuel purge system when the pressure sensor detects a pressure equal to or higher than the predetermined pressure.
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11 Claims
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1. A failure detection device for an evaporative fuel purge system for an internal combustion engine comprising:
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a canister for containing an adsorbent for adsorbing a fuel vapor; a vapor passage connecting the canister to a fuel tank, for introducing a fuel vapor in the fuel tank to the canister; a purge passage connecting the canister to an intake line of the internal combustion engine for introducing the fuel vapor adsorbed by the adsorbent in the canister to the intake line; a bypass passage for directly connecting the vapor passage and the purge passage; detection means provided in one of the purge passage and the vapor passage for detecting the pressure therein; and judging means for judging that a failure has occurred when the detection means detects a pressure higher than a predetermined pressure while the fuel vapor is purged to the intake line of the internal combustion engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification