Detection method of current sensor faults in the e-drive system by using the voltage command error

摘要

Systems, apparatus, and methods detect a current sensor error in an FOC electric machine system. A voltage command is monitored to detect the presence of an ac component that indicates that an error has occurred at a current sensor. For example, a sensor fault detection module can be configured to determine the deviation between an actual voltage command and an ideal voltage command to provide a complex deviation vector. By transforming the deviation vector to a reference frame rotating at the fundamental frequency of the command voltage, a dc component of the positive and negative sequences can be filtered, and their amplitudes determined. Error detection can be based on the total amplitude of the fundamental component, determined by positive and negative component amplitudes. Sensor error detection enables an FOC system to operate with two current sensors, rather than three, and provides a dedicated fault diagnostic for a current sensor.

主权项

1. A system, comprising:
an electric machine (EM); an energy conversion module (ECM) configured to provide energy to said EM; a sensor configured to sense a phase current between said ECM and said EM and provide feedback current; a controller configured to provide a voltage command configured to cause production of a desired torque by said EM, said voltage command dependent on said feedback current provided by said sensor; and a sensor fault detection module (SFDM) configured to isolate and use an ac component of said voltage command to detect an error at said sensor.