Fluid-pressure and analogous brake systems – Speed-controlled – Brake force or pressure determined from speed sensors
Patent
1994-09-21
1996-01-02
Ballato, Josie A.
Fluid-pressure and analogous brake systems
Speed-controlled
Brake force or pressure determined from speed sensors
303171, B60T 866
Patent
active
054802172
ABSTRACT:
An anti-lock braking system of a motor vehicle has at least three road wheels. The system comprises respective hydraulically actuating units for the road wheels. Each actuating unit feeds a brake cylinder of the corresponding road wheel with a brake pressure upon braking. A control device for controlling the magnitude of the brake pressure comprises wheel speed sensors for producing pulse signals representing the respective rotation speeds of the road wheels, a first device for deriving respective rotation speeds of the road wheels from the pulse signals, a second device for deriving a first estimated vehicle speed based on the maximum one of the respective rotation speeds, a third device for determining the maximum rotation speed as a reference rotation speed when the first estimated vehicle speed is higher than a predetermined value and for determining the third highest one of the respective rotation speeds as the reference rotation speed when the first estimated vehicle speed is lower than the predetermined value; a fourth device for deriving a second estimated vehicle speed based on the reference rotation speed; and a fifth device for controlling the magnitude of the brake pressure in accordance with the second estimated vehicle speed and the rotation speed of the wheel.
REFERENCES:
patent: 4980831 (1990-12-01), Katayama et al.
patent: 5184876 (1993-02-01), Beyer et al.
Ballato Josie A.
Unisia Jecs Corporation
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