Electronic control devices applicable to anti-skid equipment in automobile vehicles

Claim 1

An electronic control device applicable to anti-skid equipment in automobile vehicles, said device comprising; elements for maintaining each wheel of a vehicle at an optimum value of slip for which road surface to wheel adherence is at a maximum level, a velocity corresponding to said slip value being obtained from a first unit generating a signal corresponding to an acceleration of the vehicle and a second unit generating a signal corresponding to the velocity of the wheel at an instant in which the acceleration of the wheel is at a maximum value with its brake released; means for generating a signal corresponding to a deceleration of the vehicle comprising a longitudinal accelerometer and a corrector circuit for eliminating any errors due to road slope; means for generating a signal corresponding to the velocity of the wheel; means for generating a comparison signal representative of the velocity corresponding to the optimum value of slip from the deceleration of the vehicle, said comparison signal being corrected to a value of the optimum slip level in each reacceleration of the wheel by means of a differentiator and a detector of maximums; means for comparing the velocity of each wheel with a comparison signal, and according to a result thereof, applying and releasing the brake pressure of said wheel as required; and means for changing the comparison signal depending upon the response of the brake actuator of the vehicle.