Title:
【発明の名称】車両ブレーキシステム
Document Type and Number:
Japanese Patent JP3061527
Kind Code:
B2
Abstract:
A vehicle braking system having at least two wheels which are braked by fluid brake pressure comprising means to control the brake pressure above a threshold pressure for a limited time period and the system comprising means to cause the system to adopt a select high mode or a select low mode in response to the speed conditions of the wheels which are engaged with said surface during the limited time period. The system may comprise a controller responsive to wheel speed signals from at least two wheel speed sensors, for sensing skid conditions of at least two wheels and for generating skid control instructions, a plurality of wheel brakes responsive to fluid pressure, hereinafter referred to as fluid brake pressure, comprising a common supply valve, for supplying brake pressure to said brakes from a fluid pressure supply in accordance with a brake operating signal and a skid control means controlled by said skid control instructions for controlling the brake pressure in a plurality of cycles each of which comprises a pressure reduction phase and a pressure increase phase, and first comparison means to compare the co-efficient of friction of the lower friction surface with a predetermined threshold and/or second comparison means to compare the relative values of the co-efficients of friction of the surfaces with which at least two of the wheels are engaged and means to operate the skid control means in a select low mode if said comparison means determines that a) the co-efficient of friction of the lower friction surface is above a predetermined absolute level, and/or b) the co-efficients of friction of the surfaces with which at least two of the wheels are engaged differ by less than a predetermined amount, and a select high mode if said comparison means determines that a) the co-efficient of friction of a lower friction surface is at or below a predetermined absolute level, and/or b) the co-efficients of friction of said surfaces differ by at least said predetermined amount.
Inventors:
Robert David Prescott
Colin Ford Ross
Colin Ford Ross
Application Number:
JP6623994A
Publication Date:
July 10, 2000
Filing Date:
April 04, 1994
Export Citation:
Assignee:
GRAU LIMITED
International Classes:
B60T8/46; B60T8/172; B60T8/1761; B60T8/1764; B60T8/32; B60T8/36; B60T8/50; B60T8/58; B60T8/72; (IPC1-7): B60T8/58; B60T8/72
Domestic Patent References:
| JP6278590A | ||||
| JP4176766A | ||||
| JP699804A | ||||
| JP61224A | ||||
| JP1182154A | ||||
| JP585386A | ||||
| JP4238764A |
Attorney, Agent or Firm:
Kazuo Shamoto (5 outside)