APPARATUS FOR SUPPRESSING FUEL EVAPORATIVE GAS EMISSION
First Claim
1. An apparatus for suppressing fuel evaporative gas emission comprising:
- a communication path that provides communication between an intake passage of an internal combustion engine and a fuel tank;
a communication path opening/closing portion that opens/closes communication between the communication path and the intake passage;
a tank opening/closing portion that opens or closes the fuel tank to or from the communication path;
a canister that is provided to communicate between the communication path opening/closing portion and the tank opening/closing portion in the communication path, and adsorbs a fuel evaporative gas in the communication path;
a negative pressure generation portion that generates a negative pressure in the canister and the fuel tank via a communication hole that provides communication between inside and outside of the canister;
a pressure detection portion that detects an internal pressure of the fuel tank;
a communication path control portion that performs communication path closing control to close the communication path opening/closing portion and open the tank opening/closing portion; and
a sticking determination control portion that causes the negative pressure generation portion to generate a negative pressure in the fuel tank and the canister after the communication path closing control by the communication path control portion, further closes the tank opening/closing portion and then releases the negative pressure in the canister, and performs open sticking determination control to determine open sticking of the tank opening/closing portion based on the internal pressure of the fuel tank at the time.
2 Assignments
0 Petitions
Accused Products
Abstract
A purge solenoid valve is opened to introduce an atmospheric pressure into a fuel tank, the purge solenoid valve is closed to operate a negative pressure pump, and set an internal pressure of the tank to a reference pressure Pb. Then, a changeover valve is closed, and the purge solenoid valve is opened to cause a canister to communicate with an intake passage. Further, the changeover valve is opened, and the purge solenoid valve is closed. Then, a first tank internal pressure Po is detected and subtracted from the reference pressure Pb. If a calculated first pressure deviation ΔPo is larger than a first threshold ΔP1, it is determined that there is no open sticking in a sealing valve.
43 Citations
7 Claims
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1. An apparatus for suppressing fuel evaporative gas emission comprising:
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a communication path that provides communication between an intake passage of an internal combustion engine and a fuel tank; a communication path opening/closing portion that opens/closes communication between the communication path and the intake passage; a tank opening/closing portion that opens or closes the fuel tank to or from the communication path; a canister that is provided to communicate between the communication path opening/closing portion and the tank opening/closing portion in the communication path, and adsorbs a fuel evaporative gas in the communication path; a negative pressure generation portion that generates a negative pressure in the canister and the fuel tank via a communication hole that provides communication between inside and outside of the canister; a pressure detection portion that detects an internal pressure of the fuel tank; a communication path control portion that performs communication path closing control to close the communication path opening/closing portion and open the tank opening/closing portion; and a sticking determination control portion that causes the negative pressure generation portion to generate a negative pressure in the fuel tank and the canister after the communication path closing control by the communication path control portion, further closes the tank opening/closing portion and then releases the negative pressure in the canister, and performs open sticking determination control to determine open sticking of the tank opening/closing portion based on the internal pressure of the fuel tank at the time. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification