US 12,071,798 B2
Anti-pinch detection method and system
Shuang Liu, Beijing (CN); Weihao Zhu, Beijing (CN); Yanzhao Liu, Beijing (CN); and Sheng Jia, Beijing (CN)
Assigned to BEIJING JINGWEI HIRAIN TECHNOLOGIES CO., INC., (CN)
Appl. No. 17/625,404
Filed by BEIJING JINGWEI HIRAIN TECHNOLOGIES CO., INC., Beijing (CN)
PCT Filed May 29, 2020, PCT No. PCT/CN2020/093160
§ 371(c)(1), (2) Date Jan. 7, 2022,
PCT Pub. No. WO2021/004188, PCT Pub. Date Jan. 14, 2021.
Claims priority of application No. 201910620150.5 (CN), filed on Jul. 10, 2019.
Prior Publication US 2022/0228413 A1, Jul. 21, 2022
Int. Cl. H02P 29/02 (2016.01); E05F 15/40 (2015.01); E05F 15/603 (2015.01); E05F 15/70 (2015.01)
CPC E05F 15/40 (2015.01) [E05F 15/603 (2015.01); E05F 15/70 (2015.01); E05Y 2201/434 (2013.01); E05Y 2400/36 (2013.01); E05Y 2400/40 (2013.01); E05Y 2400/554 (2013.01); E05Y 2900/531 (2013.01); E05Y 2900/542 (2013.01); E05Y 2900/55 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An anti-pinch detection method, comprising:
determining a first current change rate based on a current collected in a present current collection period and a current collected in a previous current collection period, wherein the previous current collection period is a current collection period before the present current collection period and immediately adjacent to the present current collection period, wherein the current of a motor is periodically collected in a process of controlling an operation of the motor to drive a closure component to close;
determining a second current change rate based on the current collected in the present current collection period and a current collected in a target current collection period, wherein the target current collection period is a current collection period before the present current collection period and there are N current collection periods between the target current collection period and the present current collection period, wherein N is an integer greater than or equal to 2;
detecting whether the closure component contacts with an obstacle, based on the second current change rate;
determining a stiffness of the obstacle based on the first current change rate, in a case where the closure component is detected to contact with the obstacle;
determining a real-time obstacle compression distance based on an initial contact position and a motor position collected in real time, wherein the initial contact position is determined based on a motor position collected when the closure component is detected to contact with the obstacle; and
determining a real-time pinch force based on the stiffness of the obstacle and the real-time obstacle compression distance, and controlling the motor to reverse in a case where the real-time pinch force is greater than a preset anti-pinch detection threshold, wherein the anti-pinch detection threshold is determined based on the stiffness of the obstacle.