公开(公告)号：US20210184610A1

公开(公告)日：2021-06-17

申请号：US16715102

申请日：2019-12-16

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Jiyu ZHANG ,  Siddharth BALLAL ,  Lei HAO ,  Wesley G. ZANARDELLI ,  Bojian CAO

IPC: H02P21/22 ,  H02P21/18 ,  H02P21/20 ,  H02P27/12

Abstract: A diagnostic system includes: a current command module configured to, based on a motor torque request, a motor speed, a direct current (DC) bus voltage, generate a d-axis current command for an electric motor and a q-axis current command for the electric motor; a voltage command module configured to, based on the d-axis current command and the q-axis current command, generate a d-axis voltage command and a q-axis voltage command; a switching control module configured to control switching of an inverter module based on the d-axis voltage command and the q-axis voltage command, where the inverter module is configured to apply power to stator windings of the electric motor from the DC bus; and a fault module configured to selectively indicate that the stator windings of the electric motor are degraded when the d-axis voltage command is less than a predetermined nominal d-axis voltage of the electric motor.

公开(公告)号：US20210175835A1

公开(公告)日：2021-06-10

申请号：US16702877

申请日：2019-12-04

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Jiyu ZHANG ,  Siddharth BALLAL ,  Lei HAO ,  Wesley G. ZANARDELLI ,  Bojian CAO ,  Mutasim SALMAN

IPC: H02P29/028 ,  H02P29/024 ,  B60W10/08

Abstract: An electric drive system of a vehicle comprises a motor, a position sensor, an inverter, sensors to sense current and voltage supplied to the motor, and a controller to control the motor by controlling the inverter based on data from the position sensor and the sensors and a torque command. The controller estimates a motor torque using a motor model, calculates the motor torque, and generates a first state of health for the electric drive system based on a difference between the estimated and calculated motor torques. The controller generates, in response to the first state of health being less than or equal to a first threshold, a second state of health for at least one of the position sensor, the sensors, and the motor, and determines whether one of the position sensor, the sensors, and the motor is faulty based on the first and second states of health.