Control apparatus for continuously variable transmission connected to lean-burn engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTakashi Hayashi
Life of this patent
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Abstract
A control apparatus for controlling a motor vehicle having a continuously variable transmission having a pair of pulleys and a belt, and a lean-burn internal combustion engine operable in a plurality of burning conditions. This control apparatus includes an engine condition determining device for determining a currently established one of the burning conditions of the engine, and a pressure regulating device for controlling a belt tensioning pressure used to control the tension of the belt, based on an output torque of the engine, depending upon the currently established burning condition determined by the engine condition determining device.
Claims10
A control apparatus in a motor vehicle having a hydraulically operated continuously variable transmission and a lean-burn internal combustion engine operable in a plurality of burning conditions, said transmission including a pair of variable-diameter pulleys, a transmission belt connecting the pair of pulleys, and a pair of hydraulic actuators for changing effective diameters of said pulleys for continuously variably changing a speed ratio of the transmission, one of said pair of hydraulic actuators receiving a belt tensioning pressure for controlling a tension of said transmission belt, said control apparatus comprising:
- engine condition determining means for determining a currently established one of said plurality of the burning conditions of the lean-burn internal combustion engine;
- and
- pressure regulating means for controlling said belt tensioning pressure based on an output torque of the engine, depending upon the currently established burning condition determined by said engine condition determining means,
- wherein said engine condition determining means determines the currently established burning condition of said lean-burn internal combustion engine, based on a current speed of said engine and a current angle of opening of a throttle valve disposed in an intake pipe of the engine.
A control apparatus in a motor vehicle having a hydraulically operated continuously variable transmission and a lean-burn internal combustion engine operable in a plurality of burning conditions, said transmission including a pair of variable-diameter pulleys, a transmission belt connecting the pair of pulleys, and a pair of hydraulic actuators for changing effective diameters of said pulleys for continuously variably changing a speed ratio of the transmission, one of said pair of hydraulic actuators receiving a belt tensioning pressure for controlling a tension of said transmission belt, said control apparatus comprising:
- engine condition determining means for determining a currently established one of said plurality of the burning conditions of the lean-burn internal combustion engine;
- and
- pressure regulating means for controlling said belt tensioning pressure based on an output torque of the engine, depending upon the currently established burning condition determined by said engine condition determining means,
- wherein said pressure regulating means comprises an electronic control device which calculates said output torque of the engine, according to one of a plurality of predetermined relationships between a speed of said engine and an angle of opening of a throttle valve disposed in an intake pipe of said engine, said one relationship corresponding to the currently established burning condition of the engine determined by said engine condition determining means.
A control apparatus in a motor vehicle having a hydraulically operated continuously variable transmission and a lean-burn internal combustion engine operable in a plurality of burning conditions, said transmission including a pair of variable-diameter pulleys, a transmission belt connecting the pair of pulleys, and a pair of hydraulic actuators for changing effective diameters of said pulleys for continuously variably changing a speed ratio of the transmission, one of said pair of hydraulic actuators receiving a belt tensioning pressure for controlling a tension of said transmission belt, said control apparatus comprising:
- engine condition determining means for determining a currently established one of said plurality of the burning conditions of the lean-burn internal combustion engine;
- and
- pressure regulating means for controlling said belt tensioning pressure based on an output torque of the engine, depending upon the currently established burning condition determined by said engine condition determining means,
- wherein said engine condition determining means determines said currently established burning condition of said engine, based on at least one of an air-fuel ratio of an air-fuel mixture supplied to the engine, an exhaust gas recirculating rate of said engine, and an operating position of a swirl control valve provided in an intake pipe of the engine.
Dependencies are inferred from the claim text.