Driving force controller for electric vehicle

Abstract

Provided is a driving force controller for an electric vehicle, said controller having a simple configuration, being able to suppress torsional vibrations in a drive system, and being able to suppress the divergence between a target driving force and a real driving force during running-resistance generation and braking. The driving force controller controls the motor driving force in the drive system of an electric vehicle and is provided with: a target driving-force setting means (11) that sets a target driving-force on the basis of a driver request; a division means (12) that calculates a first motor-torque command value by dividing the target driving-force by a reduction ratio; a target acceleration calculation means (15) that calculates a target acceleration by dividing the target driving-force by the drive system inertia; a real acceleration calculation means (14) that calculates the real acceleration by differentiating the real motor speed; a correction amount calculation means (20) that calculates a correction amount that reduces the deviation between the target acceleration and the real acceleration; and a command value calculation means (18) that calculates a second motor-torque command value by adding the correction amount to the first motor-torque command value.

Description

technical field [0001] The invention relates to a driving force control device of an electric vehicle. Background technique [0002] In a conventional driving force control device for an electric vehicle, a motor torque command value set according to a driver's request (target driving force) is corrected in order to suppress vibration (torsional vibration) generated by torsion of a drive system. For example, the target vehicle speed is calculated as a vehicle speed when a motor torque command value is given to an ideal vehicle model in which the drive system is assumed to be a rigid body that does not undergo torsion. Then, the deviation between the target vehicle speed and the actual vehicle speed is obtained, and a correction value for reducing the deviation is calculated. The correction value is added to the motor torque command value to obtain the final motor torque command value. [0003] In the conventional ideal vehicle model, running resistance torque such as air r...

AI Technical Summary

Problems solved by technology

As a result, there is a problem that, although the torsional vibration can be suppressed by the correction value, when running resistance occurs or when braking, excessive driving force is generated so that the running resistance torque and the braking torque generated by the brake operation are also canceled out. As a result, the driver's request deviates from the actual driving force

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