US 12,280,759 B2
Vehicle brake system
Eisuke Horii, Tokyo (JP); Hiroyuki Iwasaki, Tokyo (JP); Yohei Sato, Tokyo (JP); Tomoaki Kotaki, Tokyo (JP); Masayuki Ueno, Tokyo (JP); Shotaro Yamazaki, Tokyo (JP); and Atsuki Ohira, Tokyo (JP)
Assigned to HONDA MOTOR CO., LTD., Tokyo (JP)
Filed by HONDA MOTOR CO., LTD., Tokyo (JP)
Filed on Sep. 5, 2023, as Appl. No. 18/460,836.
Claims priority of application No. 2022-141967 (JP), filed on Sep. 7, 2022.
Prior Publication US 2024/0075915 A1, Mar. 7, 2024
Int. Cl. B60T 8/40 (2006.01); B60T 13/66 (2006.01)
CPC B60T 8/4081 (2013.01) [B60T 13/662 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A vehicle brake system, comprising:
a first fluid pressure generating device configured to generate a fluid pressure according to a brake operating amount, which is an amount of operation of a brake operation member by a driver;
a second fluid pressure generating device configured to generate a fluid pressure by moving a piston with an electric actuator;
a frictional brake provided for each wheel and actuated by the fluid pressure;
a switching valve configured to switch oil passages such that the frictional brake is functionally connected to one of the first fluid pressure generating device and the second fluid pressure generating device;
a control device configured to control the second fluid pressure generating device and the switching valve; and
a vehicle behavior stabilizing device provided in the oil passage between the switching valve and the frictional brake, the vehicle behavior stabilizing device being configured to adjust the fluid pressure of a hydraulic fluid supplied from the first fluid pressure generating device or the second fluid pressure generating device and to apply an adjusted fluid pressure to the frictional brake,
wherein the switching valve is configured to be switchable between a first state in which the switching valve makes the first fluid pressure generating device and the vehicle behavior stabilizing device communicate with each other and prevents a flow of the hydraulic fluid from the vehicle behavior stabilizing device to the second fluid pressure generating device and a second state in which the switching valve prevents a flow of the hydraulic fluid from the vehicle behavior stabilizing device to the first fluid pressure generating device and makes the second fluid pressure generating device and the vehicle behavior stabilizing device communicate with each other, and
the control device places the switching valve in the second state during execution of automatic brake control in which the fluid pressure is supplied to the frictional brake regardless of brake operation by the driver, and places the switching valve in the first state when a predetermined abnormality occurs in the vehicle, except that the control device places the switching valve in the second state when an abnormality including inability of the second fluid pressure generating device to generate the fluid pressure occurs in the vehicle during the execution of the automatic brake control.