US 12,451,825 B2
Control method for electric drive system of vehicle, electric drive system, and vehicle
Heping Ling, Shenzhen (CN); Hua Pan, Shenzhen (CN); Yuxin Zhang, Shenzhen (CN); Guowei Qiu, Shenzhen (CN); and Chen Hong, Shenzhen (CN)
Assigned to BYD Company Limited, Shenzhen (CN)
Filed by BYD COMPANY LIMITED, Guangdong (CN)
Filed on Jun. 28, 2023, as Appl. No. 18/215,725.
Application 18/215,725 is a continuation of application No. PCT/CN2021/124702, filed on Oct. 19, 2021.
Claims priority of application No. 202110351040.0 (CN), filed on Mar. 31, 2021.
Prior Publication US 2023/0344375 A1, Oct. 26, 2023
Int. Cl. H02P 21/22 (2016.01); B60H 1/00 (2006.01); B60H 1/14 (2006.01); B60L 15/20 (2006.01); B60L 58/27 (2019.01); H02P 21/14 (2016.01); H02P 29/62 (2016.01)
CPC H02P 21/22 (2016.02) [B60H 1/143 (2013.01); H02P 21/14 (2013.01); H02P 29/62 (2016.02); B60H 1/00385 (2013.01); B60L 15/20 (2013.01); B60L 58/27 (2019.02); B60L 2240/423 (2013.01); B60L 2240/425 (2013.01); B60L 2240/427 (2013.01); B60L 2240/429 (2013.01)] 17 Claims
OG exemplary drawing
 
8. An electric drive system, comprising:
an electric motor and an electric motor controller;
a current sensor, configured to collect a three-phase current value of the electric motor;
a position sensor, configured to collect a position value of the electric motor; and
a processor, connected to the electric motor controller, the current sensor, and the position sensor, and configured to perform operations comprising:
acquiring a shaft torque of the electric motor and a present operating point of a vehicle in response to a vehicle heating demand signal;
acquiring a present heat generation power of the electric drive system according to the present operating point of the vehicle;
determining a current adjustment amplitude according to a vehicle heating power demand and the present heat generation power;
acquiring a three-phase current value and a position value of the electric motor, and acquiring a present direct axis current value and a present quadrature axis current value of the electric motor at the present operating point of the vehicle according to the three-phase current value and the position value;
controlling the present direct axis current value to oscillate at a change frequency and the current adjustment amplitude to obtain a target direct axis current value, by:
acquiring a first direct axis current value and a second direct axis current value according to the current adjustment amplitude, wherein
the target direct axis current value changes periodically at the change frequency with the present direct axis current value as a reference value, the first direct axis current value as a peak, and the second direct axis current value as a valley,
the first direct axis current value is a sum of the present direct axis current value and the current adjustment amplitude, and
the second direct axis current value is a difference of the present direct axis current value and the current adjustment amplitude;
acquiring a target quadrature axis current value according to the target direct axis current value and the shaft torque of the electric motor;
acquiring an electric motor drive signal according to the target direct axis current value, the target quadrature axis current value, the present direct axis current value, and the present quadrature axis current value; and
sending the electric motor drive signal to the electric motor controller, to control an operation of the electric motor.