US 11,987,136 B2
Current observer for current regulator of vehicle electric traction motor
Vinod Chowdary Peddi, Shelby Township, MI (US); Muhammad Hussain Alvi, Troy, MI (US); Lei Hao, Troy, MI (US); and Suresh Gopalakrishnan, Troy, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM Global Technology Operations LLC, Detroit, MI (US)
Filed on Sep. 30, 2021, as Appl. No. 17/490,069.
Prior Publication US 2023/0099460 A1, Mar. 30, 2023
Int. Cl. B60L 15/20 (2006.01); B60W 10/08 (2006.01)
CPC B60L 15/2054 (2013.01) [B60W 10/08 (2013.01); B60L 2210/40 (2013.01); B60L 2240/423 (2013.01); B60L 2240/429 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A system in a vehicle, comprising: a current regulator configured to obtain current commands from a controller based on a torque input and provide voltage commands;
an inverter configured to use the voltage commands from the current regulator and direct current (DC) supplied by a battery to provide alternating current (AC); an electric traction motor configured to provide drive power to a transmission of the vehicle based on injection of the AC from the inverter;
a current observer configured to obtain measured input current signals for a first control cycle and to provide predicted current signals for a next control cycle to the current regulator using a model, the current observer including a controller configured to check output of the model against the measured input current signals, and the current observer tuning parameters of the controller and the model used to generate the predicted current signals based on the measured input current signals,
the current observer configured to select the model and tune of the parameters of the model according to a ratio of a sampling frequency to a frequency of the electric traction motor;
and a converter that converts the AC, which is a three-phase AC, to a input direct-axis current signal and a input quadrature-axis current signal for the measured input current signals of the first control cycle, wherein the predicted current signals for the next control cycle include a direct-axis predicted current and a quadrature-axis predicted current, and the current observer includes a separate set of the controller and the model specific to the direct-axis predicted current and to the quadrature-axis predicted current.