Method of estimating current sensor induced torque error for IPMSM based electric drive system

摘要

A method of estimating torque control errors in an electric machine takes into account the effects of current sensor error characteristics. Systems and methods may be implemented to determine the maximum sensor error that can be tolerated without causing unacceptable torque errors. One example method uses sensor characteristics and engine characteristics to determine current sense errors, current control errors, and torque control errors. Determining the lowest sensor accuracy required for a desired torque control accuracy may allow, without compromising performance, the use of lower cost sensors in current control electrical drive systems. Other applications may include vehicle diagnostics and torque error compensation.