Control system having data correlation for controlling a vehicular anti-lock braking system

A system for controlling the disabling of a vehicular anti-lock brake control system for a vehicle having wheels where the anti-lock system reduces braking pressure on a wheel which is determined to be locking, said disabling controlling system including:

• a plurality of wheel speed sensor means for providing an output indicative of the rotational speed of a respective wheel;
• a plurality of controllers, each of said controllers comprising a means, responsive to at least one wheel speed sensor means output, for providing data for substantially identical control functions;
• arbitration means for arbitrating between said controllers, said arbitration means comprising a data processor means for comparing said data from said controllers for correlation and for providing an output indication of an mount of correlation of said data;
• and
• means, responsive to said data processor means output indication of an amount of correlation of said data being less than a limit, for at least providing an alarm signal suggesting that an operator of the vehicle disable said anti-lock system, wherein said means for providing an alarm signal includes a means for disabling at least the brake pressure reduction of said anti-lock system, wherein said vehicle has four wheels, said plurality of speed sensor means comprises at least four speed sensors, at least one of said speed sensors associated with a respective one of said four wheels, said plurality of controllers comprising two microprocessors, each of said microprocessors including a separate channel responsive to each of said at least four speed sensors and the output from each sensor means is applied to each microprocessor, wherein said output data is data representative of wheel speed, and said correlation comprises comparison of the wheel speed data for one wheel applied to both microprocessors, and said limit of correlation is a function of the wheel speed, wherein said wheel speed data is reflective of wheel speeds from 0 to greater than 300 kilometers per hour, and said limit of correlation for the wheel speed range between 0 and 100 kilometers per hour is data indicative of a wheel speed difference of 1 kilometer per hour, said limit of correlation for the wheel speed range between 100 and 200 kilometers per hour is data indicative of a wheel speed difference of 2 kilometers per hour, said limit of correlation for the wheel speed range between 200 and 300 kilometers per hour is data indicative of a wheel speed difference of 3 kilometers per hour, and said limit of correlation for the wheel speed range of greater than 300 kilometers per hour is data indicative of a wheel speed difference of 4 kilometers per hour.