Control system and method for operating adjustable vehicular suspension unit over undulating road surfaces

A system for controlling an adjustable suspension unit of a motor vehicle comprising:

• sensor means for determining the vertical motion of a road wheel and tire assembly operatively associated with said suspension unit, with respect to the chassis of said vehicle and for producing a first set of signals corresponding to the position of said road wheel and tire assembly with respect to the chassis of said motor vehicle;
• processor means operatively associated with said sensor means for determining the need for adjusting said adjustable suspension unit, comprising:
• (i) means for receiving said first set of position signals and for calculating the vertical velocity of said road wheel with respect to said chassis based upon said position signals;
• (ii) means for comparing the magnitude of said calculated velocity of said road wheel with a set of threshold velocity values;
• (iii) means for producing a control signal but only in the event that said calculated velocity lies between two of said threshold values;
• and
• adjustment means operatively connected with said processor means and responsive to said control signal for adjusting said adjustable suspension unit.