Control device for a hybrid vehicle

A method for controlling a hybrid vehicle, the hybrid vehicle including a motor connected to an engine output shaft, to which an engine output is transmitted, and an automatic transmission, the automatic transmission including an input shaft connected to the engine output shaft, and an output shaft connected to a driving wheel, the method comprising:

• identifying a request torque of an operator and a limitation torque of the automatic transmission;
• determining an engine torque produced when the engine operates at a predetermined best torque based on engine speed;
• calculating a difference between a lower torque of the request torque and the limitation torque and the predetermined best torque;
• controlling a motor to provide additional torque when the best torque is less than the lower torque and a regeneration torque when the lower torque is greater than the best torque;
• and
• adjusting the engine torque when a combination of best torque and the one of a maximum additional torque and a maximum regeneration torque of the motor can't provide the lower torque.

A control method for a hybrid vehicle, the hybrid vehicle including a motor, connected to an engine output shaft, to which an engine output is transmitted, and an automatic transmission, the automatic transmission including an input shaft, connected to the engine output shaft, and an output shaft, connected to a driving wheel, the method comprising:

• detecting a driver's requested output;
• controlling the engine output;
• controlling motor output so that a total output of the motor output and the engine output becomes the driver's requested output;
• and
• when the driver's requested output is larger than input-available driving force to the input shaft of the automatic transmission, limiting the total output to a limitation output, which is smaller than or equal to the input-available driving force, wherein, when the total output is limited to the limitation output, controlling the motor output so that the total output of the motor output and the engine output becomes the limitation output.

A control device for a hybrid vehicle, the hybrid vehicle including a motor, connected to an engine output shaft, to which an engine output is transmitted, and an automatic transmission, the automatic transmission including an input shaft, connected to the engine output shaft, and an output shaft, connected to a driving wheel, the control device comprising:

• request output detection means for detecting a driver's requested output;
• engine control means for controlling the engine output;
• motor control means for controlling motor output so that total output of the motor output and the engine output becomes the driver's requested output;
• and
• limitation request output means for, when the driver's requested output is larger than an input-available driving force to the input shaft of the automatic transmission, outputting a limitation request to limit the total output to limitation output, which is smaller than or equal to the input-available driving force, wherein the motor control means, when the limitation request is output by the limitation request output means, controls the motor output so that the total output of the motor output and the engine output becomes the limitation output.