Hybrid vehicle and method of controlling hybrid vehicle

A hybrid vehicle comprising:

• an engine including a turbo charger;
• a first motor generator that generates electric power by using motive power of the engine;
• a power divider that divides motive power output from the engine into motive power to be transmitted to the first motor generator and motive power to be transmitted to a drive wheel;
• a second motor generator that transmits motive power to the drive wheel;
• an obtaining device that obtains a temperature of the turbo charger;
• and
• a controller that controls the engine, the first motor generator, and the second motor generator based on the temperature of the turbo charger, wherein
• when the temperature of the turbo charger does not exceed a threshold value, the controller sets as an operating point, a position on a predetermined operating line where engine power requested of the engine is output, the predetermined operating line being set on a coordinate plane of engine torque and an engine rotation speed,
• when the temperature of the turbo charger exceeds the threshold value, the controller sets as the operating point, a position changed from the position set on the predetermined operating line toward a lower torque side with the engine rotation speed being equal,
• the controller controls the engine and the first motor generator for the engine to operate at the set operating point, and
• the controller compensates for shortage in driving force corresponding to lowering in engine torque from the position set on the predetermined operating line to the operating point by using the second motor generator.

A method of controlling a hybrid vehicle, the hybrid vehicle including an engine including a turbo charger, a motor generator that generates electric power by using motive power of the engine, and a power divider that divides motive power output from the engine into motive power to be transmitted to the motor generator and motive power to be transmitted to a drive wheel, the method comprising:

• obtaining a temperature of the turbo charger;
• when the temperature of the turbo charger does not exceed a threshold value, setting as an operating point, a position on a predetermined operating line where engine power requested of the engine is output, the predetermined operating line being set on a coordinate plane of engine torque and an engine rotation speed;
• when the temperature of the turbo charger exceeds the threshold value, setting as the operating point, a position changed from the position set on the predetermined operating line toward a higher rotation speed side along an equal power line of the engine power;
• and
• controlling the engine and the motor generator for the engine to operate at the set operating point.

A method of controlling a hybrid vehicle, the hybrid vehicle including an engine including a turbo charger, a first motor generator that generates electric power by using motive power of the engine, a power divider that divides motive power output from the engine into motive power to be transmitted to the first motor generator and motive power to be transmitted to a drive wheel, and a second motor generator that transmits motive power to the drive wheel, the method comprising:

• obtaining a temperature of the turbo charger;
• when the temperature of the turbo charger does not exceed a threshold value, setting as an operating point, a position on a predetermined operating line where engine power requested of the engine is output, the predetermined operating line being set on a coordinate plane of engine torque and an engine rotation speed;
• when the temperature of the turbo charger exceeds the threshold value, setting as the operating point, a position changed from the position set on the predetermined operating line toward a lower torque side with the engine rotation speed being equal;
• controlling the engine and the first motor generator for the engine to operate at the set operating point;
• and
• compensating for shortage in driving force corresponding to lowering in engine torque from the position set on the predetermined operating line to the operating point by using the second motor generator.