US 12,403,876 B2
Vehicle brake system
Etsugou Yanagida, Kariya (JP); Daisuke Hokuto, Kariya (JP); and Kunio Nanba, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Jun. 8, 2022, as Appl. No. 17/835,096.
Application 17/835,096 is a continuation of application No. PCT/JP2020/046371, filed on Dec. 11, 2020.
Claims priority of application No. 2019-225659 (JP), filed on Dec. 13, 2019.
Prior Publication US 2022/0297649 A1, Sep. 22, 2022
Int. Cl. B60T 8/32 (2006.01); B60T 7/04 (2006.01); B60T 8/172 (2006.01); B60T 11/10 (2006.01); B60T 13/68 (2006.01); B60T 17/22 (2006.01)
CPC B60T 8/326 (2013.01) [B60T 7/042 (2013.01); B60T 8/172 (2013.01); B60T 11/103 (2013.01); B60T 13/686 (2013.01); B60T 17/221 (2013.01); B60T 2270/402 (2013.01); B60T 2270/413 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A vehicle brake system comprising:
a vehicle brake device including
a brake pedal that has a pedal portion, and a lever portion rotating about a rotation axis in response to the pedal portion being operated,
a first stroke sensor configured to output a first signal based on a stroke amount of the brake pedal,
a second stroke sensor configured to output a second signal based on the stroke amount of the brake pedal,
a housing that rotatably supports the lever portion, and
a reaction force generation portion configured to generate a reaction force applied on the lever portion based on the stroke amount;
a first hydraulic pressure generation unit configured to generate a hydraulic pressure for braking a vehicle;
a second hydraulic pressure generation unit configured to generate hydraulic pressure for braking the vehicle;
a first hydraulic pressure control device that includes a first drive circuit configured to drive the first hydraulic pressure generation unit;
a second hydraulic pressure control device that includes a second drive circuit configured to drive the second hydraulic pressure generation unit;
a first power supply configured to supply power to the first hydraulic pressure control device;
a second power supply configured to supply power to the second hydraulic pressure control device;
a power supply switching circuit configured to switch a power supply source that supplies the power to the first hydraulic pressure control device and the second hydraulic pressure control device, between the first power supply and the second power supply based on a first voltage that is a voltage applied from the first power supply to the first hydraulic pressure control device and a second voltage that is a voltage applied from the second power supply to the second hydraulic pressure control device;
a first sensor power supply line that is connected to the first hydraulic pressure control device and the first stroke sensor, and configured to supply the power from the first power supply, from the first hydraulic pressure control device to the first stroke sensor;
a second sensor power supply line that is connected to the second hydraulic pressure control device and the second stroke sensor, and configured to supply the power from the second power supply, from the second hydraulic pressure control device to the second stroke sensor;
a third sensor power supply line that is connected to the first hydraulic pressure control device and the first stroke sensor, and configured to supply the power from the first power supply, from the first hydraulic pressure control device to the first stroke sensor;
a fourth sensor power supply line that is connected to the second hydraulic pressure control device and the second stroke sensor, and configured to supply the power from the second power supply, from the second hydraulic pressure control device to the second stroke sensor;
a first sensor output line that is connected to the first hydraulic pressure control device and the first stroke sensor, and configured to transmit the first signal from the first stroke sensor to the first hydraulic pressure control device;
a second sensor output line that is connected to the first hydraulic pressure control device and the second stroke sensor, and configured to transmit the second signal from the second stroke sensor to the first hydraulic pressure control device;
a third sensor output line that is connected to the second hydraulic pressure control device and the first stroke sensor, and configured to transmit the first signal from the first stroke sensor to the second hydraulic pressure control device;
a fourth sensor output line that is connected to the second hydraulic pressure control device and the second stroke sensor, and configured to transmit the second signal from the second stroke sensor to the second hydraulic pressure control device,
wherein
the first hydraulic pressure control device is configured to determine whether the first stroke sensor and the second stroke sensor are normal based on the first signal from the first stroke sensor transmitted through the first sensor output line and the second signal from the second stroke sensor transmitted through the second sensor output line, and when the first stroke sensor and the second stroke sensor are normal, control the first drive circuit based on at least one of the first signal from the first stroke sensor or the second signal from the second stroke sensor to control the hydraulic pressure generated by the first hydraulic pressure generation unit, and
the second hydraulic pressure control device is configured to determine whether the first stroke sensor and the second stroke sensor are normal based on the first signal from the first stroke sensor transmitted through the third sensor output line and the second signal from the second stroke sensor transmitted through the fourth sensor output line, and when the first stroke sensor and the second stroke sensor are normal, control the second drive circuit based on at least one of the first signal from the first stroke sensor or the second signal from the second stroke sensor to control the hydraulic pressure generated by the second hydraulic pressure generation unit.