US Patent No. 10,768,234

METHOD FOR ESTIMATING POWER CONSUMPTION OF MOTOR IN FUEL CELL SYSTEM


Patent No. 10,768,234
Issue Date September 08, 2020
Title Method For Estimating Power Consumption Of Motor In Fuel Cell System
Inventorship Dong Hun Lee, Anyang-si (KR)
Chang Seok You, Anyang-si (KR)
Min Su Kang, Paju-si (KR)
Sung Do Kim, Seongnam-si (KR)
Assignee HYUNDAI MOTOR COMPANY, Seoul (KR) KIA MOTORS CORPORATION, Seoul (KR)

Claim of US Patent No. 10,768,234

1. A method for estimating power consumption of a motor in a fuel cell system, the method comprising steps of:supplying, by a controller, a terminal voltage command for each of multiple phases of the motor to an inverter;
driving, by the controller, switching elements included in the inverter based on the terminal voltage command;
detecting, by a current sensor, a current of each of the multiple phases of the motor depending on a change in the terminal voltage command;
extending, by the controller, a line of a region where the current is linearly changed in a voltage-current graph showing a relationship between the terminal voltage command and the detected current, and determining, by the controller, a voltage value of a point where the line meets a voltage axis of the voltage-current graph to be an error voltage for each of the multiple phases;
generating, by the controller, a compensation terminal voltage for each of the multiple phases of the motor by applying the error voltage to a prediction value of the terminal voltage that is derived in a preset manner during operation of the motor;
calculating, by the controller, power consumption of the motor by using the compensation terminal voltage and a current value obtained by detecting a current that flows in each of the multiple phases of the motor; and
controlling, by the controller, power output from the fuel cell system to be restricted based on the calculated power consumption of the motor.