Vehicle driving force control with different corrections for engine torque control an CVT ratio control

A driving force control method for an automotive vehicle powertrain including a prime mover and a continuously variable transmission (CVT), the prime mover being operable to accomplish a target output torque, the CVT being operable to alter a CVT ratio to accomplish a target ratio, the driving force control method comprising:

• detecting the vehicle's operator depression of an accelerator pedal of the vehicle;
• detecting a vehicle speed of the vehicle;
• determining an ordinary target driving force in response to the detected vehicle's operator depression of the accelerator pedal and the detected vehicle speed;
• determining a driving force correction;
• determining a first corrected target driving force after correcting the determined ordinary target driving force in response to the determined driving force correction;
• determining a second corrected target driving force after correcting the determined ordinary target driving force in response to the determined driving force correction;
• said first and second corrected target driving forces being different from each other, and
• determining the target output torque and the target ratio in response to the determined corrected first and second target driving forces, respectively.

A driving force control system for an automotive vehicle power train including a prime mover and a continuously variable transmission (CVT), the prime mover being operable to accomplish a target output torque, the CVT being operable to alter a CVT ratio to accomplish a target ratio, the driving force control system comprising:

• an accelerator pedal sensor to detect the vehicle's operator depression of an accelerator pedal of the vehicle;
• a vehicle speed sensor to detect a vehicle speed of the vehicle;
• and
• a power train controller that is operative to:
• determine an ordinary target driving force in response to the detected vehicle's operator depression of the accelerator pedal and the detected vehicle speed,
• determine a driving force correction,
• determine a first corrected target driving force by adding said driving force correction to said ordinary target driving force,
• modify said driving force correction to provide a modified driving force correction,
• determine a second corrected target driving force by adding said modified driving force correction to said ordinary target driving force, and
• determine the target output torque and the target ratio in response to the determined first and second corrected target driving forces, respectively,
• wherein said modified driving force correction is not greater than said driving force correction.