US 12,292,476 B2
Diagnosis device and system
Yilong Yu, Shenzhen (CN); Luhui Xu, Shenzhen (CN); Zhiyong Du, Shenzhen (CN); Axi Qi, Shenzhen (CN); and Guangming Yang, Shenzhen (CN)
Assigned to BYD COMPANY LIMITED, Shenzhen (CN)
Appl. No. 17/909,273
Filed by BYD COMPANY LIMITED, Guangdong (CN)
PCT Filed Aug. 24, 2020, PCT No. PCT/CN2020/110877
§ 371(c)(1), (2) Date Sep. 2, 2022,
PCT Pub. No. WO2021/174772, PCT Pub. Date Sep. 10, 2021.
Claims priority of application No. 202010149569.X (CN), filed on Mar. 6, 2020.
Prior Publication US 2023/0086012 A1, Mar. 23, 2023
Int. Cl. G01R 31/34 (2020.01); G01D 5/20 (2006.01)
CPC G01R 31/343 (2013.01) [G01D 5/20 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A diagnosis device, comprising a master chip, an excitation conditioning circuit, a motor resolver, and an analog signal conditioning circuit, wherein
the master chip comprises a first analog-to-digital converter, a second analog-to-digital converter, a first processor, and a monitoring core;
the first processor is configured to send an excitation signal to the motor resolver through the excitation conditioning circuit;
the motor resolver is configured to generate a sine analog signal and a cosine analog signal based on the excitation signal;
the analog signal conditioning circuit is configured to process the sine analog signal and output a processed sine analog signal to the first analog-to-digital converter, and to process the cosine analog signal and output a processed cosine analog signal to the second analog-to-digital converter;
the first analog-to-digital converter is configured to convert the processed sine analog signal to a sine digital signal and to send the sine digital signal to the first processor and the monitoring core;
the second analog-to-digital converter is configured to convert the processed cosine analog signal to a cosine digital signal and to send the cosine digital signal to the first processor and the monitoring core;
the first processor is configured to obtain a first motor angle based on the sine digital signal and the cosine digital signal and send the first motor angle to the monitoring core; and
the monitoring core is configured to detect whether a first difference between the sine digital signal and a preset sine digital signal threshold falls within a range of a sine signal diagnosis threshold, whether a second difference between the cosine digital signal and a preset cosine digital signal threshold falls within a range of a cosine signal diagnosis threshold, and whether a third difference between the first motor angle and a preset angle threshold falls within a range of an angle diagnosis threshold; and
wherein each of the sine signal diagnosis threshold, the cosine signal diagnosis threshold, and the angle diagnosis threshold is determined based on at least one of a model of the motor, a model of a vehicle, or a scene where the vehicle is located.