DETERMINATION OF A TEST PROCEDURE USING SPECIFICATIONS ON BRAKING FORCE DISTRIBUTION

ERMITTLUNG EINES PRUERVERFAHRENS BEI DER ANWENDUNG DER VORSCHRIFTEN UEBER DIE BREMSKRAFTVERTEILUNG

IN THE ECE SPECIFICATION (71/320/EWG) THE COURSE OF THE ADHESION COEFFICIENTS NEEDED BETWEEN THE WHEELS AND THE ROAD IS ESTABLISHED AS A FUNCTION OF BRAKING (FRICTION CURVES) AND THE RETENTION OF A DEFINED BRAKING FORCE DISTRIBUTION ON THE AXLES WITHIN NARROW LIMITS. UP TO NOW THE FRICTION CURVES HAVE BEEN CALCULATED BY THE MANUFACTURER. THE OBJECT OF THE STUDY WAS TO DEVELOP A TEST PROCEDURE WHICH STARTED FROM MEASUREMENTS ON THE VEHICLE, SOLUTIONS ARE INDICATED, LIMITED TO TWO-AXLE VEHICLES. PROCEDURES ARE OUTLINED FOR DETERMINING THE FRICTION CURVES FROM MEASUREMENTS OF BASIC MAGNITUDES, AND APPLIED TO A LADEN SAMPLE VEHICLE. THE FRICTION CURVES OBTAINED FROM THE MEASURED VALUES AGREE WITH THOSE FROM THE VEHICLE DATA SUPPLIED BY THE MANUFACTURERS.