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1. (WO2017169475) VEHICLE BRAKE HYDRAULIC CONTROL DEVICE

Pub. No.:    WO/2017/169475    International Application No.:    PCT/JP2017/007926
Publication Date: Fri Oct 06 01:59:59 CEST 2017 International Filing Date: Wed Mar 01 00:59:59 CET 2017
IPC: B60T 8/172
B60T 8/1761
Applicants: NISSIN KOGYO CO., LTD.
日信工業株式会社
Inventors: TOYODA, Masahiro
豊田 昌宏
YAMAKAWA, Teruyoshi
山川 輝敬
Title: VEHICLE BRAKE HYDRAULIC CONTROL DEVICE
Abstract:
[Problem] To provide a vehicle brake hydraulic control device such that it is possible to accurately determine, with a simple method, when the coefficient of friction of the travel road surface to tires changes suddenly from a low coefficient of friction coefficient to a high coefficient of friction. [Solution] A vehicle brake hydraulic control device which is capable of hydraulic control of the brake hydraulic pressure applied to wheel brakes. It is determined whether or not the pressure-increasing time in the present pressure-increasing control exceeds a determination time which is set on the basis of the pressure-increasing time in past pressure-increasing control. If the pressure-increasing time in the present pressure-increasing control exceeds the determination time, it is determined that the road surface on which the vehicle is traveling has changed from a road surface with a low coefficient of friction to a road surface with a high coefficient of friction. [Effect] It is possible to accurately determine, with a simple method, when the road surface on which the vehicle is traveling has changed suddenly from a road surface with a low coefficient of friction to a road surface with a high coefficient of friction.