Vehicle braking system
US5421644A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1994 |
| Grant date | Jun 6, 1995 |
| Priority date | — |
| Expiry date | Apr 1, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T2210/124
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A vehicle braking system comprising 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 brake pressure, supplied thereto; a supply device, comprising a common supply valve, for supplying brake pressure to the brakes from a fluid pressure supply in accordance with a brake operating signal; and a skid controller controlled by the 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 a first comparitor to compare the co-efficient of friction of the lower friction surface with a predetermined threshold, and/or a second comparitor 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 a device to operate the skid controller in a select low mode if the comparitors determine that a) the co-efficient of friction of the lower friction surface is above a predetermined absolute level, and…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.