Driving force control system for vehicle

A driving force control system for a vehicle, comprising:

• a transmission including a first motor-generator connected to an engine, and a second motor-generator connected to driven wheels and driven by electric power generated by said first motor-generator;
• a first rotational speed sensor for detecting a rotational speed of said first motor-generator;
• a second rotational speed sensor for detecting a rotational speed of said second motor-generator;
• and
• means for controlling the rotational speed of said first motor-generator in accordance with the rotational speed of said second motor-generator, said controlling means including means for controlling a ratio between a first driving frequency for said first motor-generator and a second driving frequency for said second motor-generator so as to control the rotational speeds of said first and second motor-generators.

A driving force control system for a vehicle, comprising:

• a transmission including a first motor-generator connected to an engine, and a second motor-generator connected to driven wheels;
• and
• a control unit programmed to carry out
• calculating a first target driving torque in accordance with at least one of an operating condition of the vehicle and a driver's operation for the vehicle,
• calculating a target power output in accordance with the first target driving torque and a value representative of a vehicle speed,
• correcting the target power output in accordance with an operating condition of said transmission and the state of charge of a battery,
• setting a second target driving torque upon calculating the second target driving torque in accordance with the corrected target power output and the value representative of the vehicle speed,
• setting a target input shaft rotational speed of said transmission upon calculating the target input shaft rotational speed in accordance with the second target driving torque and the value representative of the vehicle speed,
• setting a target engine torque upon calculating the target engine torque in accordance with a speed-changing ratio set for said transmission and the second target driving torque, the target engine torque, and
• controlling said first motor-generator in accordance with the target input shaft rotational speed, and controlling said second motor-generator in accordance with the first target driving torque.

A driving force control system for a vehicle, comprising:

• a transmission including a first motor-generator connected to an engine, and a second motor-generator connected to driven wheels;
• means for calculating a first target driving torque in accordance with at least one of an operating condition of the vehicle and a driver's operation for the vehicle;
• means for calculating a target power output in accordance with the first target driving torque and a value representative of a vehicle speed;
• means for correcting the target power output in accordance with an operating condition of said transmission;
• means for setting a second target driving torque upon calculating the second target driving torque in accordance with the corrected target power output and the value representative of the vehicle speed;
• means for setting a target input shaft rotational speed of said transmission upon calculating the target input shaft rotational speed in accordance with the second target driving torque and the value representative of the vehicle speed;
• means for setting a target engine torque upon calculating the target engine torque in accordance with a speed-changing ratio set for said transmission and the second target driving torque;
• means for controlling the engine in accordance with the target engine torque;
• and
• means for controlling said first motor-generator in accordance with the target input shaft rotational speed, and controlling said second motor-generator in accordance with the first target driving torque.

A method of controlling driving force for a vehicle provided with a transmission including a first motor-generator connected to an engine, and a second motor-generator connected to driven wheels, said driving force controlling method comprising:

• calculating a first target driving torque in accordance with at least one of an operating condition of the vehicle and a driver's operation for the vehicle;
• calculating a target power output in accordance with the first target driving torque and a value representative of a vehicle speed;
• correcting the target power output in accordance with an operating condition of said transmission;
• setting a second target driving torque upon calculating the second target driving torque in accordance with the corrected target power output and the value representative of the vehicle speed;
• setting a target input shaft rotational speed of said transmission upon calculating the target input shaft rotational speed in accordance with the second target driving torque and the value representative of the vehicle speed;
• setting a target engine torque upon calculating the target engine torque in accordance with a speed-changing ratio set for said transmission and the second target driving torque;
• controlling the engine in accordance with the target engine torque;
• and
• controlling said first motor-generator in accordance with the target input shaft rotational speed, and controlling said second motor-generator in accordance with the first target driving torque.