Apparatus for controlling the spinning of driven wheels of a vehicle

Abstract

Abstract 1372929 Automatic control of speed DAIMLERBENZ A G 22 Sept 1972 [28 Sept 1971] 44037/72 Heading GIN and G3N Apparatus for eliminating slip of the driven wheels of a motor vehicle comprises means for comparing the angular speeds of a driven and a non-driven wheel and controlling either the braking pressure or the engine torque in accordance with the difference, as modified by the actual vehicle speed and the acceleration of the driven wheel. As shown (Fig.2), the angular speed of a driven wheel 3 and a non-driven wheel 1, both on one side of a vehicle, are measured by tachogenerators 7, 5, the difference between the speeds being obtained in a comparator 11. The signal is modified at 12 in accordance with the vehicle speed, determined from the speed of the non-driven wheel 1, and further modified at 13 in accordance with the angular acceleration of the driven wheel 3, determined by differentiating at 10 the angular speed signal from tachogenerator 7. The resulting output signal is fed through a filter 14, eliminating hunting components, to (a) an OR element 20 (Fig.3) together with a similar signal from the other side of the vehicle, to allow control of the engine torque at 22 by the larger of the two signals, and (b) a level sensing element 15 for each side of the vehicle, which passes a signal if a pre-set level is exceeded. If only one element 15 produces an output signal, it is fed to the brake actuating system 17, 18, 19 for that side: if both elements 15 produce an output signal, NAND gate 16 opens switch 21 to energize control element 22 which reduces the engine torque.

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