Driving force distribution control apparatus for four-wheel drive vehicle and driving force distribution control method for four-wheel drive vehicle

摘要

A driving force distribution control apparatus for a four-wheel drive vehicle includes a theoretical value calculator, a normative value calculator, and a servo controller. The theoretical value calculator is configured to calculate a primary rotational speed theoretical value of primary drive wheels and a secondary rotational speed theoretical value of secondary drive wheels based on a steering angle, a vehicle speed, a yaw rate, and a slip angle of the four-wheel drive vehicle and configured to calculate a rotational difference normative theoretical value indicating a difference between rotational speed theoretical values of input and output shafts of a drive force distribution apparatus using the primary rotational speed theoretical value and the secondary rotational speed theoretical value.

主权项

1. A driving force distribution control apparatus for a four-wheel drive vehicle including a driving force transmission path via which a driving force generated by a drive source is transferred to primary drive wheels and secondary drive wheels, and a driving force distribution apparatus disposed in the driving force transmission path between the drive source and the secondary drive wheels, the driving force distribution control apparatus comprising:
a theoretical value calculator configured to calculate a primary rotational speed theoretical value of the primary drive wheels and a secondary rotational speed theoretical value of the secondary drive wheels based on a steering angle, a vehicle speed, a yaw rate, and a slip angle of the four-wheel drive vehicle and configured to calculate a rotational difference normative theoretical value indicating a difference between rotational speed theoretical values of input and output shafts of the drive force distribution apparatus using the primary rotational speed theoretical value and the secondary rotational speed theoretical value; a normative value calculator configured to calculate a rotational difference normative value by correcting the rotational difference normative theoretical value based on a deviation between a measurement value of a rotational difference between the input and output shafts of the drive force distribution apparatus and the rotational difference normative theoretical value; and a servo controller configured to correct the driving force provided to the secondary drive wheels using the drive force distribution apparatus through servo control of the rotational difference measurement value, a target value of the servo control being the rotational difference normative value.