Wheel position determination using revolution counter

A tire monitoring wheel unit, comprising:

• an accelerometric device;
• a wheel unit controller, said controller comprising a module for receiving signals from said accelerometric device and determining a direction of rotation of a wheel unit mounting said wheel, and a number of rotations of said wheel unit;
• and
• a transmitter capable of transmitting to a central receiving unit of a vehicle, an indication of a side of said vehicle on which said wheel unit is mounted, based at least in part on the determination of direction of rotation of the wheel unit, and transmitting an indication of the number of rotations of said wheel, and transmitting an identification unique to said wheel unit.

A tire monitoring system for a vehicle comprising:

• a tire monitoring wheel unit disposed in each wheel of said vehicle, each of said wheel units comprising:
• one or more accelerometric devices;
• a wheel unit controller, said controller comprising a module for receiving signals from said one or more accelerometric devices and capable of determining a direction of rotation of a wheel mounting said wheel unit, and a number of rotations of said wheel unit;
• and
• a transmitter capable of transmitting, to a central receiving unit, the number of rotations of said wheel;
• a central controller capable of receiving the transmissions from each of the wheel units, and further capable of comparing the number of rotations with wheel speed information for the vehicle, to determine if one wheel on each side of the vehicle is rotating at a different speed than the other wheel on the same side, and determining, based at least in part on this determination for each or either side of the vehicle, which wheel unit on a side of the vehicle is located on a drive axle of the vehicle.