DISTANCE TRANSMITTING UNIT (DTU)
In conjunction with other navigational sensors, provides an input signal to a ground-based vehicular navigation system.
The output signal from the DTU provides two or four pulses per one DTU shaft revolution.
DTUs are normally directly or indirectly coupled to a self-propelled vehicle’s transmission system. In the case of towed vehicles, the DTU is normally coupled to a free rotating shaft.
The pulses from the DTU measure distance (with the scaling dependent on pulses per revolution, gear ratio (if any), and wheel diameter, which is affected by the vehicle’s tyre pressure).
The DTU, consisting of an input shaft, pulse detecting sensors and a dual channel transmitter output stage, can be fitted to an engine gearbox via an angle drive, or alternatively could be fitted around a wheel shaft or inside a wheel hub. The DTU operates from 5VDC. The DTU output is connected to the vehicle navigation system.
Rotation of the input shaft of the DTU causes a series of electronic pulses to be transmitted from each of its output channels. The frequency of the pulse streams is proportional to the rotation rate of the input shaft. The electronic pulses are RS422 compatible.
For each 360° rotation of the shaft of the DTU, it will output four pulses on each transmitter output channel.
The phase shift between the pulse streams from each output channel is such that when the input shaft rotates clockwise, the output from channel one leads the output from channel two by 90°. When the input shaft rotates anti-clockwise, the output from channel one will lag the output from channel two by 90°.
A single Mil-Std 3734 W 10-6P connector provides power to the DTU, and provides access to the transmitter output signals of the DTU.
The power consumption of the DTU is less than 0.5 Watts.
Please contact M-Tek for more information about this product by clicking Request Information below.
