Vehicle and control method of vehicle

A vehicle, comprising:

• an internal combustion engine;
• an air-fuel ratio sensor provided in an exhaust passage of the internal combustion engine;
• a controller configured to diagnose a responsiveness of the air-fuel ratio sensor based on an output voltage of the air-fuel ratio sensor in a predefined period, the predefined period being a period over which exhaust gas goes through the air-fuel ratio sensor while the internal combustion engine is rotating without fuel injection;
• an electric motor that starts up the internal combustion engine;
• and
• an angle acquisition device that acquires a crank angle at a time at which startup of the internal combustion engine is initiated, wherein:
• the controller is configured to diagnose the responsiveness based on the output voltage of the air-fuel ratio sensor in the predefined period corresponding to a period from the internal combustion engine is started up to the fuel injection is initiated, upon startup of the internal combustion engine by the electric motor from a stopped state, and
• the controller is configured to correct a result of diagnosis of the responsiveness obtained at the time of startup of the internal combustion engine, in accordance with the crank angle acquired by the angle acquisition device.

A vehicle, comprising:

• an internal combustion engine;
• an air-fuel ratio sensor provided in an exhaust passage of the internal combustion engine;
• and
• a controller configured to diagnose a responsiveness of the air-fuel ratio sensor based on an output voltage of the air-fuel ratio sensor in a predefined period, the predefined period being a period over which exhaust gas goes through the air-fuel ratio sensor while the internal combustion engine is rotating without fuel injection, wherein:
• the controller is configured to calculate, upon diagnosis of the responsiveness, at least any one of a locus length, an average slope, a maximum slope and an integrated value, of the output voltage of the air-fuel ratio sensor in the predefined period, as a parameter that denotes the responsiveness,
• the controller is configured to calculate, as the parameter, the integrated value of the output voltage, in a case where an initial voltage, being an output voltage of the air-fuel ratio sensor obtained at the time at which diagnosis of the responsiveness is initiated, lies within a first voltage range, and
• the controller is configured to calculate, as the parameter, the locus length of the output voltage in a case where the initial voltage lies outside the first voltage range.

A vehicle, comprising:

• an internal combustion engine;
• an air-fuel ratio sensor provided in an exhaust passage of the internal combustion engine;
• and
• a controller configured to diagnose a responsiveness of the air-fuel ratio sensor based on an output voltage of the air-fuel ratio sensor in a predefined period, the predefined period being a period over which exhaust gas goes through the air-fuel ratio sensor while the internal combustion engine is rotating without fuel injection, wherein
• the controller is configured to diagnose the responsiveness when a predefined condition is met upon initiation of the diagnosis, and
• the controller is configured to modify the predefined condition in accordance with a history up to a previous result of diagnosis of the responsiveness.

A vehicle, comprising:

• an internal combustion engine;
• an air-fuel ratio sensor provided in an exhaust passage of the internal combustion engine;
• and
• a controller configured to diagnose a responsiveness of the air-fuel ratio sensor based on an output voltage of the air-fuel ratio sensor in a predefined period, the predefined period being a period over which exhaust gas goes through the air-fuel ratio sensor while the internal combustion engine is rotating without fuel injection, wherein
• the controller is configured to calculate, upon diagnosis of the responsiveness, at least any one of a locus length, an average slope, a maximum slope and an integrated value, of the output voltage of the air-fuel ratio sensor in the predefined period, as a parameter that denotes the responsiveness, and
• the controller is configured to modify the calculated parameter in accordance with a history up to a previous result of diagnosis of the responsiveness.

A method for controlling a vehicle, comprising:

• diagnosing a responsiveness of an air-fuel ratio sensor based on an output voltage of the air-fuel ratio sensor in a predefined period, the predefined period is a period over which exhaust gas goes through the air-fuel ratio sensor during an internal combustion engine is rotating without fuel injection;
• intermittently operating the internal combustion engine in accordance with a vehicle state while the vehicle is traveling;
• diagnosing the responsiveness based on the output voltage of the air-fuel ratio sensor in the predefined period corresponding to a period when the internal combustion engine is stopped to the fuel injection is initiated, when the internal combustion engine is started up by the electric motor from a state of being stopped during the vehicle is traveling,
• acquiring a crank angle at a time at which startup of the internal combustion engine is initiated;
• and
• correcting a result of diagnosis of the responsiveness obtained at the time of startup of the internal combustion engine in accordance with the acquired crank angle.

A method for controlling a vehicle, comprising:

• diagnosing a responsiveness of an air-fuel ratio sensor based on an output voltage of the air-fuel ratio sensor in a predefined period, the predefined period is a period over which exhaust gas goes through the air-fuel ratio sensor during an internal combustion engine is rotating without fuel injection;
• diagnosing the responsiveness based on the output voltage of the air-fuel ratio sensor in the predefined period corresponding to a period from the internal combustion engine is started up to the fuel injection is initiated, upon startup of the internal combustion engine by the electric motor from a stopped state;
• acquiring a crank angle at a time at which startup of the internal combustion engine is initiated is acquired;
• and
• correcting a result of diagnosis of the responsiveness obtained at the time of startup of the internal combustion engine in accordance with the acquired crank angle.

A method for controlling a vehicle, comprising:

• diagnosing a responsiveness of an air-fuel ratio sensor based on an output voltage of the air-fuel ratio sensor in a predefined period, the predefined period is a period over which exhaust gas goes through the air-fuel ratio sensor during an internal combustion engine is rotating without fuel injection, wherein:
• upon diagnosis of the responsiveness, at least any one of a locus length, an average slope, a maximum slope and an integrated value, of the output voltage of the air-fuel ratio sensor in the predefined period, is calculated as a parameter that denotes the responsiveness,
• the integrated value of the output voltage is calculated as the parameter in a case where an initial voltage, being an output voltage of the air-fuel ratio sensor obtained at the time at which diagnosis of the responsiveness is initiated, lies within a first voltage range, and
• the locus length of the output voltage is calculated as the parameter in a case where the initial voltage lies outside the first voltage range.