US 11,913,995 B2
Method of determining the state of charge of a battery used in an electric vehicle
Suvrat Ramasubramanian, Costa Mesa, CA (US); Ali Jokar, Irvine, CA (US); and Jing Hong, Trabuco Canyon, CA (US)
Assigned to Karma Automotive LLC, Irvine, CA (US)
Filed by Karma Automotive LLC, Irvine, CA (US)
Filed on May 20, 2022, as Appl. No. 17/664,357.
Application 17/664,357 is a continuation of application No. 16/808,142, filed on Mar. 3, 2020, granted, now 11,360,147.
Prior Publication US 2022/0276309 A1, Sep. 1, 2022
Int. Cl. G01R 31/367 (2019.01); G01R 31/3835 (2019.01)
CPC G01R 31/367 (2019.01) [G01R 31/3835 (2019.01)] 18 Claims
OG exemplary drawing
 
1. A computer-implemented method executed on data processing hardware causes the data processing hardware to perform comprising, at each time step of a plurality of time steps:
receiving battery parameters for a battery;
based on the received battery parameters for the battery:
determining an estimated voltage of the battery; and
determining an estimated state of charge (SOC) of the battery;
receiving a measured voltage of the battery;
determining a voltage error value based on the measured voltage of the battery and the estimated voltage of the battery;
correcting, using the voltage error, the estimated SOC to determine a corrected SOC for the battery;
operating the battery based on the corrected SOC;
determining an innovation sequence based on the voltage error and a measurement error variance;
determining the innovation sequence lies outside of upper and lower confidence bounds; and
determining an updated covariance error based on determining that the innovation sequence lies outside of the upper and lower confidence bounds.