Control apparatus and control method for motor vehicle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsNaoto Suzuki, Toshifumi Takaoka, Takashi Suzuki, Daimon Okada
Life of this patent
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Abstract
A control apparatus for a motor vehicle detects a catalyst temperature during fuel cut. If the catalyst temperature is higher than a predetermined temperature, the control apparatus almost completely opens a throttle valve and increases an amount of intake air to thereby reduce pumping loss. If the catalyst temperature is equal to or lower than the predetermined temperature, the throttle valve is almost completely closed. Thereby it becomes possible to reduce pumping loss of the engine while preventing an excessive decrease in catalyst temperature.
Claims20
A control apparatus for a motor vehicle, comprising:
- a fuel supply detector that detects whether or not supply of fuel to an engine has been stopped during a traveling state of the vehicle;
- a temperature detector that detects a temperature of a catalyst in an exhaust system;
- and
- a controller that restricts flow of outside air into the exhaust system if it is detected that fuel supply in the vehicle has been stopped and that the temperature of the catalyst in the exhaust system is equal to or lower than a predetermined temperature and that causes outside air to flow into the exhaust system if it is detected that fuel supply in the vehicle has been stopped and that the catalyst temperature is higher than the predetermined temperature.
A control apparatus for a motor vehicle, comprising:
- a fuel supply detector that detects whether or not fuel supply in the vehicle has been stopped during the traveling state of the vehicle;
- and
- a controller that increases an amount of intake air in an engine if it is detected that fuel supply in the vehicle has been stopped and that retards a timing for closing exhaust valves of the engine with respect to a timing during fuel supply.
A control method for a motor vehicle, comprising:
- detecting whether or not fuel supply to the engine has been stopped during a traveling state of the vehicle;
- detecting a temperature of a catalyst in an exhaust system;
- restricting flow of outside air into the exhaust system if it is detected that fuel supply in the vehicle has been stopped and that the temperature of the catalyst in the exhaust system is equal to or lower than a predetermined temperature;
- and
- permitting flow of outside air into the exhaust system if it is detected that fuel supply in the vehicle has been stopped and that the temperature of the catalyst in the exhaust system is higher than the predetermined temperature.
A control method for a motor vehicle, comprising:
- detecting whether or not fuel supply in the vehicle has been stopped during a traveling state of the vehicle;
- and
- increasing an amount of intake air in the engine if it is detected that fuel supply in the vehicle has been stopped;
- and
- retarding a timing for closing exhaust valves of the engine with respect to a timing during fuel supply.
Dependencies are inferred from the claim text.