The accelerometers are oriented so that their axes are orthogonal to one another. These are used to calculate the amount of G-force that the IMU is experiencing. The gyroscopes are arranged in a similar manner. Intelligent Tire Market uses absolute or relative coordinate reference systems to determine the rotational position of the unit. The coordinate reference system chosen is determined by the end-use of the gyroscope in the vehicle. Intelligent TPMS, on the other hand, typically employs an acceleration sensor module known as a G sensor. These sensors are quite tough because they are placed inside tires, which are subject to both extreme heat and high torque.
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