Malfunction diagnosis device for fuel-evaporated-gas processing device

A malfunction diagnosis device for a fuel-evaporated-gas processing device which absorbs a fuel evaporated gas in a fuel tank to an absorbing agent and supplying the fuel evaporated gas thus absorbed to an engine through a fuel-evaporated-gas passage with a valve disposed therein, said malfunction diagnosis device comprising:

• malfunction determination means for determining a malfunction of said fuel-evaporated-gas processing device based on pressures in said fuel tank detected when said valve is opened and closed or an amount of change in an air/fuel ratio of a air/fuel mixture supplied to said engine;
• and
• determination processing means for invalidating, when any of exhaust-gas-related-components other than said fuel-evaporated-gas processing device malfunctions, the result of the determination of a malfunction of said fuel-evaporated-gas processing device which has been effected in the same malfunction checking cycle.

A malfunction diagnosis device for a fuel-evaporated-gas processing device which absorbs a fuel evaporated gas in a fuel tank to an absorbing agent and supplying the fuel evaporated gas thus absorbed to an engine through a fuel-evaporated-gas passage with a valve disposed therein, said malfunction diagnosis device comprising:

• malfunction determination means for determining a malfunction of said fuel-evaporated-gas processing device based on pressures in said fuel tank detected when said valve are opened and closed or an amount of change in an air/fuel ratio of an air/fuel mixture supplied to said engine;
• and
• determination processing means for stopping a malfunction determination processing for said fuel-evaporated-gas processing device when any of exhaust-gas-related-components other than said fuel-evaporated-gas processing device malfunctions.

A malfunction diagnosis device for a fuel-evaporated-gas processing device which absorbs a fuel evaporated gas in a fuel tank to an absorbing agent and supplying the fuel evaporated gas thus absorbed to an engine through a fuel-evaporated-gas passage with a valve disposed therein, said malfunction diagnosis device comprising:

• malfunction determination means for determining a malfunction of said fuel-evaporated-gas processing device based on pressures in said fuel tank detected when said valve is opened and closed or an amount of change in an air/fuel ratio of an air/fuel mixture supplied to said engine;
• and
• determination processing means for determining a period of time for prohibiting the determination of malfunction after the start of said engine based on an operating state of said engine, said determination processing means being operable to prohibit the determination of a malfunction of said fuel-evaporated-gas processing device for said period of time after the engine starting.

A malfunction diagnosis device for a fuel-evaporated-gas processing device which absorbs a fuel evaporated gas in a fuel tank to an absorbing agent and supplies the fuel evaporated gas thus absorbed to an engine through a fuel-evaporated-gas passage with a valve disposed therein, said malfunction diagnosis device comprising:

• malfunction determination means for determining a malfunction of said fuel-evaporated-gas processing device based on pressures in said fuel tank detected when said valve is opened and closed or an amount of change in an air/fuel ratio of an air/fuel mixture supplied to said engine;
• and
• determination processing means for determining a period of time for prohibiting the determination of malfunction after the start of said engine based on an integrated value of an amount of air sucked by said engine after the start thereof, said determination processing means being operable to prohibit the determination of a malfunction of said fuel-evaporated-gas processing device for said period of time after the engine starting.

A malfunction diagnosis device for a fuel-evaporated-gas processing device which absorbs a fuel evaporated gas in a fuel tank to an absorbing agent and supplies the fuel evaporated gas thus absorbed to an engine through a fuel-evaporated-gas passage with a valve disposed therein, said malfunction diagnosis device comprising:

• malfunction determination means for determining a malfunction of said fuel-evaporated-gas processing device based on pressures in said fuel tank detected when said valve is opened and closed or an amount of change in an air/fuel ratio of an air/fuel mixture supplied to said engine;
• and
• determination processing means for determining a period of time for prohibiting the determination of malfunction after the start of said engine based on at least one of an operating state of said engine and an integrated value of an amount of air sucked by said engine after the start thereof, said determination processing means being operable to prohibit the determination of a malfunction of said fuel-evaporated-gas processing device for said period of time after the engine starting.