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US 9,850,855 B2Granted
Fuel evaporative gas emission control apparatus
AssigneeMitsubishi Jidosha Kogyo Kabushiki Kaisha
InventorsHideo Matsunaga, Katsuhiro Furuta, Kyosuke Uematsu
Life of this patent
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Abstract
When a leak test for a purge pipe and a vapor pipe as targets is executed, a sealing valve that is being closed is opened while an open state of a bypass valve is kept prior to the execution of the leak test, fuel evaporative gas in a fuel tank is caused to flow out to a canister side to reduce a tank internal pressure Ptan to a valve opening guarantee determination value P0, and after the bypass valve is closed subsequently, the leak test is started.
Claims20
A fuel evaporative gas emission control apparatus, comprising:
- a communication path that provides communication between an intake passage of an internal combustion engine and a fuel tank;
- a canister that is connected to the communication path and adsorbs fuel evaporative gas in the communication path;
- a canister opening and closing valve that opens and closes communication between the communication path and the canister;
- a purge valve that opens and closes the communication path between the intake passage and the canister;
- a sealing valve that opens and closes communication between the fuel tank and the communication path;
- a leak test execution unit that executes a leak test by opening the sealing valve and closing the canister opening and closing valve, and thereafter opening the canister opening and closing valve, in a state where the purge valve is closed;
- and
- a pressure regulation control unit that, prior to the leak test by the leak test execution unit, reduces an internal pressure of the fuel tank to a valve opening guarantee determination value that is set in advance by opening the sealing valve which is being closed while keeping the canister opening and closing valve in an open state, and thereafter closes the canister opening and closing valve.
5 more elements
Dependencies are inferred from the claim text.