Patent ID: 11899069
Assignee: CUMMINS INC.
Field: Measurement (Instruments)
Classification: CPC G  B  Y | IPC B  G

Claim 5:
6. A method of performing a power estimation process for an electric vehicle using a controller, the method comprising:
performing 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;
estimating 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;
calculating an upper bound and a lower bound that are associated with the SOC value;
estimating a bounded SOC value of the energy storage supply based on the SOC value, the first upper bound, and the lower bounds,
wherein the energy storage supply is a battery, the method further comprising:
receiving a series of current data indicative of measurements of current flowing through the battery;
receiving a series of voltage data indicative of measurements of voltages of the battery;
calculating an amp-hour SOC estimation (Ah-SOC) using the series of current data;
calculating a voltage SOC estimation (V-SOC) using the series of voltage data and the series of current data; and
generating 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;
comparing an SOC measurement with the upper bound and the lower bound;
setting the bounded SOC value to the upper bound in response to determining that the SOC measurement is greater than the upper bound; and
controlling an electrification process of the electric vehicle based on the bounded SOC value.