A description is given of an electro-hydraulic brake-pressure control, developed for testing electronic circuits for anti-lock braking systems for road vehicles. After an introduction to the problem and a short description of the contact between the tire and the road surface on braking, a survey is given of the basic principles of anti-lock systems. Such a system consists of three main parts: a sensor for the angular velocity of the wheel, a processing unit, and an actuator that, if required, can reduce the brake pressure and increase it again (this has since been modified and improved). The actuator includes an electronically controlled solenoid valve, which reduces the brake pressure if wheel lock is imminent by causing brake fluid to flow out of the brake system, a pump that returns the fluid to the master cylinder, and a variable restrictor, which ensures that the rate at which the brake pressure increases again depends on the type of road surface. Various fail-safe arrangements are included to give trouble-free operation: if a leak occurs in the solenoid valve, or even if the valve stays open, normal braking is retained.

  • Corporate Authors:

    Philips' Telecommunicatie Industrie BV

    P.O. Box 32
    Hilversum 1301,   Netherlands 
  • Authors:
    • Skoyles, D R
  • Publication Date: 1976

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00153223
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Jun 17 1977 12:00AM