US 12,233,839 B2
Redundancy based electric brake failure detection method and device using the same
Toshiaki Nakamura, Tokyo (JP); Tohma Yamaguchi, Hitachinaka (JP); and Asahi Watanabe, Hitachinaka (JP)
Assigned to Hitachi Astemo, Ltd., Hitachinaka (JP)
Appl. No. 17/439,939
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
PCT Filed Mar. 18, 2020, PCT No. PCT/JP2020/012137
§ 371(c)(1), (2) Date Sep. 16, 2021,
PCT Pub. No. WO2020/217795, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. 2019-082606 (JP), filed on Apr. 24, 2019.
Prior Publication US 2022/0185250 A1, Jun. 16, 2022
Int. Cl. B60T 8/88 (2006.01); B60T 8/171 (2006.01); H02P 3/04 (2006.01); H02P 3/08 (2006.01); H02P 101/45 (2016.01)
CPC B60T 8/885 (2013.01) [B60T 8/171 (2013.01); H02P 3/04 (2013.01); H02P 3/08 (2013.01); B60T 2220/04 (2013.01); B60T 2270/413 (2013.01); H02P 2101/45 (2015.01); H02P 2203/03 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An electric brake control device comprising:
a motor for opening and closing a brake caliper pinching a brake disc;
a first angle sensor and a second angle sensor for detecting a rotation angle of the motor;
a stroke sensor for detecting a stepping amount of a brake pedal;
a first control circuit for controlling the motor based on the stepping amount detected by the stroke sensor and receiving a detected value of the first angle sensor;
wherein the first control circuit comprises a first microcomputer; and
a second control circuit for controlling the motor based on the stepping amount detected by the stroke sensor and receiving a detected value of the second angle sensor, wherein the second control circuit comprises a second microcomputer; and wherein:
the first microcomputer is configured to transmit signals to and receive signals from the second microcomputer,
the first microcomputer is configured to calculate a control angle of the motor based on the stepping amount detected by the stroke sensor, and
the first microcomputer is configured to detect a failure of the first angle sensor and a failure of the second angle sensor, according to (i) the detected value of the first angle sensor, (ii) the detected value of the second angle sensor received from the second microcomputer (iii) the control angle of the motor, and (iv) a determination threshold.