Steering Solutions IP Holding Corporation

Nayeem Mahmud

Prerit Pramod

Julie Ann Kleinau

Dennis B Skellenger

Zhe Zhang

Rakesh Mitra

An embodiment of a control system includes a pulse modulation module configured to generate a modulation signal controlling application of voltages to an electric motor, the modulation signal having a series of one or more successive pulses corresponding to a control cycle. The system also includes a current prediction module configured to receive a sampled electric current value from the electric motor taken at a sample time during a first control cycle n, predict a value of the electric current at a subsequent time related to an immediately following control cycle n+1 based on the sampled electric current value and a voltage applied to the motor during the first control cycle n, and output the predicted electric current value to the pulse modulation module. The system further includes a converter module configured to receive the modulation signal and output a voltage signal to the motor based on the modulation signal.

Current prediction for delay compensation in motor control systems

An embodiment of a system for determining a sensor failure in a motor control system with at least three phase current measurements includes a magnitude computation module that determines a magnitude of a diagnostic voltage, the diagnostic voltage represented in a stator frame and based on a difference between an input voltage command and a final voltage command, and a phase evaluation module that determines a phase value of the diagnostic voltage based on the diagnostic voltage. The system also includes a sensor failure identification module that identifies a current sensor failure based on the phase value of the diagnostic voltage, the sensor failure represented by a failure signal, and a current calculation transition module that modifies a calculation scheme for determining a measurement of motor current based on the sensor failure.

Growing community of inventors

Saginaw, MI, United States of America

Nayeem Mahmud