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Apparatus for suppressing fuel evaporative gas emission

  • US 9,574,525 B2
  • Filed: 12/23/2013
  • Issued: 02/21/2017
  • Est. Priority Date: 12/26/2012
  • Status: Active Grant
First Claim
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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.

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