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Sensor + Test 2018

Wheel telemetry for acquisition of brake temperatures

Published 2018-06-28

Caemax Technology has developed a system for wireless temperature measurement on vehicle wheels. The system is based on the company’s Dx telemetry and measures up to four thermocouples on one wheel.

Integration into existing measurement technology via the Classical CAN and analog interfaces (Photo: Caemax)

With a sampling rate of 200 Hz, even highly dynamic temperature gradients can be examined during brake tests. A IP67-rated housing protects against wind and weather. Using a mounting plate, the telemetry unit can be attached to the vehicle's wheel bolts. Due to a rechargeable battery, up to 50 hours of operation with only one charge is possible.

All measurement signals are digitized directly on the wheel in the transmitter electronics and transmitted telemetrically via mirror antennas to the receiver unit inside the vehicle. Up to four wheels (transmitter units) can be acquired synchronously with only one receiver. The receiver synchronously acquires the data of those transmitters and outputs them as analog signals or a ClassicalCAN data stream. In addition, a convenient system check with remote-controlled encoder breakage detection is available. Additional channels, such as battery voltage and internal housing temperature, make it easier to constantly monitor the transmitters.

The Dx transmitter module (Photo: Caemax)

In addition to wheel telemetry for temperature measurements with type J or K thermocouples, there are further variants for acceleration measurements (IEPE sensors) and strain measurements (strain gauge bridges). Via analog outputs and a digital Classical CAN interface, telemetry systems can be integrated into existing measurement technology. This is particularly convenient with IMC measurement systems. They not only synchronously acquire telemetric data and all other sensor signals, including field and vehicle buses, but also processes and stores them in real time. They also offer, for example, a range of networking options for transferring measurement data directly into a cloud. IMC shows the product at the Sensor + Test exhibition in Nuremberg, Germany.

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