Applied Power Inc.

Eugene D Johnston

Arnold A Weiss

Daniel M Motl

Vehicle brake testing apparatus of the type in which there are yieldable restrained pairs of tread plates engaging the front wheels and rear wheels of a vehicle in which there is means for producing an electrical signal depending in value upon the braking force on each wheel, means for producing a total braking force signal depending upon the sums of the signals, means for measuring the speed of the vehicle as it is driven onto the tread plates and producing an electrical speed signal, means for dividing the integrated total force signal by the speed signal to obtain a weight signal indicative of the weight of the vehicle and means for comparing the total force signal with the weight signal to obtain an indication of the ratio between the total braking force and the weight of the vehicle and indicating whether this ratio meets acceptable standards. The apparatus employs digital processing equipment with means for converting the analog signals resulting from actuation of the tread plates to digital signals and computing means for computing the values of various relations between the values of the various digital signals and displaying these relationships. Among the relations which are displayed are the value of the ratio between the difference in the front wheel braking signals and the the front wheel braking signal which is the maximum of the two braking signals. Another ratio which is displayed is the same ratio in connection with the rear wheel braking signals. Another ratio which is computed and displayed is the value of the relation between the total of the front wheel braking signals and the total of the braking signals of all four wheels.

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Saint Paul, MN, United States of America

Eugene D Johnston