US 11,899,069 B2
SOC and SOH co-estimation systems and methods for electric vehicles
Guodong Fan, Columbus, IN (US); Ruigang Zhang, Bargersville, IN (US); Jordan Loos, Phoenix, OR (US); and Aleksey Yezerets, Columbus, IN (US)
Assigned to CUMMINS INC., Columbus, IN (US)
Filed by Cummins Inc., Columbus, IN (US)
Filed on Mar. 5, 2021, as Appl. No. 17/193,555.
Application 17/193,555 is a continuation in part of application No. PCT/US2019/065171, filed on Dec. 9, 2019.
Claims priority of provisional application 63/036,198, filed on Jun. 8, 2020.
Claims priority of provisional application 62/783,615, filed on Dec. 21, 2018.
Prior Publication US 2021/0190867 A1, Jun. 24, 2021
Int. Cl. G01R 31/367 (2019.01); G01R 31/392 (2019.01); G01R 31/36 (2020.01); B60L 58/14 (2019.01); G01R 31/388 (2019.01); B60L 58/26 (2019.01); B60L 58/16 (2019.01); G01R 31/3842 (2019.01)
CPC G01R 31/367 (2019.01) [B60L 58/14 (2019.02); B60L 58/16 (2019.02); B60L 58/26 (2019.02); G01R 31/3648 (2013.01); G01R 31/388 (2019.01); G01R 31/3842 (2019.01); G01R 31/392 (2019.01)] 10 Claims
OG exemplary drawing
 
1. A controller for performing a power estimation process for an electric vehicle, the controller comprising:
a processor; and
a memory including instructions that, when executed by the processor, cause the controller to:
perform the power estimation process by estimating an inner state of an energy storage supply of the electric vehicle, the inner state representing a state-of-charge (SOC) of the energy storage supply,
estimate an SOC value of the energy storage supply based on at least one of: a present current level, a present voltage level, a present temperature associated with the energy storage supply, and time-based information; and
calculate an upper bound and a lower bound that are associated with the SOC value and estimate a bounded SOC value of the energy storage supply based on the SOC value, the upper bound, and the lower bound, and the second lower bound;
wherein the energy storage supply is a battery, and the instructions, when executed by the processor, further cause the controller to:
receive a series of current data indicative of measurements of current flowing through the battery;
receive a series of voltage data indicative of measurements of voltages of the battery;
calculate an amp-hour SOC estimation (Ah-SOC) using the series of current data;
calculate a voltage SOC estimation (V-SOC) using the series of voltage data and the series of current data; and
generate the bounded SOC value of the battery comprising the upper bound and the lower bound;
wherein the upper bound is determined based on a larger value of the Ah-SOC and V-SOC, and the lower bound is determined based on a smaller value of the Ah-SOC and V-SOC;
compare an SOC measurement with the upper bound and the lower bound; and
set the bounded SOC value to the upper bound in response to determining that the SOC measurement is greater than the upper bound,
wherein the controller controls an electrification process of the electric vehicle based on the bounded SOC value.