The system described, called CRM, uses a two-stage microprocessor control and dual air valves in a single unit. It can be fitted to steering as well as rear axles so that the vehicle can still be steered whilst the wheels are being braked close to their adhesion limit. On the first indication of wheel-lock, the braking air pressure is first held and secondly released if tyre slide should start to develop. Brake re-application rate is varied to suit the circumstances by using the microprocessor to sample the wheel rotation at a rate of 100 times a second. Wheel speed sensing is done by the use of slotted discs in a magnetic field but it can be made to operate from sensations in the edge of the brake drum. Since the characteristics are programmable, the unit can function with any number of slots on the sensor disc. The microprocessor is self-checking and continues to work from one sensor should the other fail. (TRRL)

  • Availability:
  • Corporate Authors:

    Institute of Road Transport Engineeers

    1 Cromwell Place
    London SW1 25F,   England 
  • Publication Date: 1985-8

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 10-11
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00452760
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jul 31 1986 12:00AM