Electronic balancing system for balancing road vehicle wheels

Electronic balancing system for balancing mounted road vehicle wheels, comprising:

• a wheel to be balanced having marks on it;
• electromechanical transducer means to supply electric signals proportional to the vibration induced by the unbalance of the wheel;
• a pair of optoelectronic transducer means to supply electric signals when energized by said marks;
• analog and digital processing means including programmer means;
• a programmable gain amplifier electrically connected to said electromechanical transducer means and programmer means for supplying a current proportional to the number set in the programmer means;
• a variable gain amplifier connected to said programmable gain amplifier and said period meter means;
• active band-pass filter means connected to said variable gain amplifier and said period means synchronized with the rotation speed of the wheel;
• analog to digital converter means including storage means and comparator means connected to said filter means to indicate the peak value of the electrical signal produced by said electromechanical transducer means;
• squarer means connected to said band-pass filter means to convert said electrical signal into an indentical phase square wave;
• and display means connected to said analog to digital converter means to indicate the value of the unbalancing weight;
• a digital processor including period meter means connected to said squarer means and to said optoelectronic transducer means to locate the position of said unbalance;
• light beam projector means connected to said digital processor to project onto the wheel a beam of light indicating the position of unbalance.