Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1994-04-01
1995-06-06
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
188181C, 303102, 303106, 303110, 303 96, 303111, 3031181, B60T 832
Patent
active
054216443
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/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 in a select high mode if the comparitors determine 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 the surfaces differ by at least the predetermined amount.
REFERENCES:
patent: 3794389 (1974-02-01), Davis et al.
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patent: 3972568 (1976-08-01), Fleischer
patent: 4005910 (1977-02-01), Leiber et al.
patent: 4576419 (1986-03-01), Leiber
patent: 4652060 (1987-03-01), Miyake
patent: 4852953 (1989-08-01), Brearley et al.
patent: 4982806 (1991-01-01), Yoshizawa et al.
Automotive Engineer vol. 18, No.1, Feb./Mar. 1993, p. 24 XP345219.
Prescott Robert D.
Ross Colin F.
Butler Douglas C.
Grau Limited
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