Evaporated fuel treatment device of internal combustion engine
First Claim
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1. An evaporated fuel treatment device for internal combustion engine that uses a canister to absorb evaporated fuel generated in a fuel tank for evaporated fuel treatment purposes, said device comprising:
- a sealing valve for controlling the continuity between said fuel tank and said canister;
a differential pressure generation condition judgment means for judging whether a differential pressure generation condition is established, said condition being established when the sealing valve is expected to be closed and differential pressure is expected to be generated between both sides of the sealing valve;
a differential pressure detection means for detecting the difference between a canister side pressure which exists in a canister side area of the sealing valve and a tank internal pressure when said differential pressure generation condition is established; and
an open failure normality judgment means for judging that no open failure exists in said sealing valve when said differential pressure detection means detects a differential pressure higher than a judgment value.
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Abstract
Disclosed is an evaporated fuel treatment device that includes a sealing valve installed between a fuel tank and a canister, a pump module pressure sensor for detecting the pressure on the canister side pressure, and a tank internal pressure sensor for detecting a tank internal pressure. Upon detection of a significant difference between the canister side pressure and tank internal pressure, the device concludes that no open failure exists in the sealing valve.
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Citations
7 Claims
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1. An evaporated fuel treatment device for internal combustion engine that uses a canister to absorb evaporated fuel generated in a fuel tank for evaporated fuel treatment purposes, said device comprising:
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a sealing valve for controlling the continuity between said fuel tank and said canister; a differential pressure generation condition judgment means for judging whether a differential pressure generation condition is established, said condition being established when the sealing valve is expected to be closed and differential pressure is expected to be generated between both sides of the sealing valve; a differential pressure detection means for detecting the difference between a canister side pressure which exists in a canister side area of the sealing valve and a tank internal pressure when said differential pressure generation condition is established; and an open failure normality judgment means for judging that no open failure exists in said sealing valve when said differential pressure detection means detects a differential pressure higher than a judgment value.
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2. An evaporated fuel treatment device for internal combustion engine that uses a canister to absorb evaporated fuel generated in a fuel tank for evaporated fuel treatment purposes, said device comprising:
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a sealing valve for controlling the continuity between said fuel tank and said canister; a differential pressure generation condition judgment means for judging whether a differential pressure generation condition is established, said condition being established when the sealing valve is expected to be closed and differential pressure is expected to be generated between both sides of the sealing valve; a condition establishment differential pressure detection means for detecting the difference between a canister side pressure and a tank internal pressure when said differential pressure generation condition is established; and an open failure abnormality judgment means for judging that an open failure exists in said sealing valve when said condition establishment differential pressure detection means does not detect a differential pressure greater than a judgment value. - View Dependent Claims (3, 4, 5, 6, 7)
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Specification