Method and apparatus for determining tire condition and location using wheel speed sensors and acceleration sensors

A method for sensing condition of a tire comprising the steps of:

• sensing two relative rotational positions of the tire relative to the earth's horizon as the tire rotates using acceleration sensors and providing first and second acceleration signals indicative thereof;
• transmitting signals from the tire including tire identification, tire condition Information, and a signal processing time delay value using a transmitter in response to said first and second acceleration signals, wherein the processing time delay represents the time delay in processing the first and second acceleration signals during tire rotation;
• monitoring tire rotation relative to the vehicle's chassis using a vehicle-based sensor and providing a signal indicative thereof;
• and
• monitoring the transmitted tire identification, tire condition information the signal processing time delay value, and the signal indicative of the tire rotation relative to the vehicle's chassis using a controller, said controller associating tire identification with a tire location in response