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Ultrasonic sensor

Modular configuration based on CAN

The Big Sonic-Ski is a grade sensor for leveling control. It consists of several ultrasonic heads, whose measurements are added to an average value. The number of sensors can be extended via CAN.

The Moba-matic with four Big Sonic-Skis on the beam on the right (Photo: Moba)

CAN COMMUNICATION HAS BECOME A standard in the automation of mobile machines. In Moba’s leveling system Moba-matic for asphalt pavers, the communication between the system components (controller and sensors) is based on CAN and the Moba-owned CAN protocol. Therefore, the system is flexible, programmable, and the standardized interface allows connecting different sensors. For example, a new Moba temperature sensor, used to measure the material temperature during the paving process, can be integrated.

The Big Sonic-Ski’s extension from three to four sensors was also simple. The Sonic-Ski is a grade sensor for leveling control, which is part of the Moba-matic leveling system. The measuring method of the Sonic-Ski is based on an average calculation of several independent ultrasonic measurements. Three Sonic-Ski sensors form the Big Sonic-Ski. This combines the advantage of the multi-spot ultrasonic measurement of the Sonic-Ski with the possibility to sense a ground section at several spatially separated spots.

So to speak, the Big Sonic-Ski quadruples the advantages of the single Sonic-Ski, which detects distances to the reference as a contact-free distance sensor with five ultrasonic heads. By combining up to four of these sensors, different points in a distance of up to 13 m are measured and an average value is determined. Any unevenness is compensated and a high planeness of the road surface can be achieved while paving. By default, the Big Sonic-Ski’s bus is run with 125 kbit/s and an 11-bit identifier. The bit-rate and the identifier can be set flexibly. The configuration ID provides further settings to adjust the sensors to a control loop or to superordinate control units. The single sensors are connected to a special junction box. Since all modules are equipped with the same plug, every Sonic-Ski can be used at every plug position.

The CAN network is addressed via the plug. The junction box itself is page addressed by the superordinate control unit or a hard-coded port at the machine. This constellation allows running two Big-Sonic Skis with altogether eight sensors in a network with two control units. Every single sensor can be identified and configured at every position in the CAN network and therefore can be used flexibly in applications.

 

Publish date
2015-07-16
Company

Moba

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Publish date
2015-07-16
Company

Moba

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