Patent ID: 11884162
Assignee: KIA CORPORATION
Field: Transport (Mechanical engineering)
Classification: CPC B  Y | IPC B  G

Claim 0:
1. A motor control system for a commercial vehicle having an electric axle, the motor control system comprising:
a first motor and a second motor disposed in a rear-wheel electric axle;
an accelerator position sensor configured to detect a degree to which an accelerator is depressed;
a wheel speed sensor configured to detect a wheel speed change; and
a controller configured to:
determine a driver's required torque based on detection signals of the accelerator position sensor and the wheel speed sensor, respectively, and
control a first motor torque of the first motor to approach a target torque for satisfying the driver's required torque while either controlling a second motor torque of the second motor to a level that compensates for a torque error of the first motor or controlling the first motor torque and the second motor torque at alternating fixed duty ratios,

wherein, when the first motor torque and the second motor torque are controlled at the alternating fixed duty ratios, a maximum-torque period for the first motor and a maximum-torque period for the second motor are determined as being shorter than a time taken for a temperature of each motor to reach a maximum reference temperature.