Patent ID: 9574525
Date: 2017-02-21
CPC Classifications: B60K,B60Y,F02M,Y10T

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 by keeping the communication path opening/closing portion closed 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 holding state of the negative pressure in the fuel tank at the time.