Browsing by Subject "CAN-väylä"

Modern agricultural tractors produce a large amount of information for controlling various functions of the tractor and farming implements. By including location data to the measurements, the data obtained can be used, for example, to study the conditions in the field or the tractor's work cycle. The development of telematics systems should aim at completely automated solutions. ISO 11783 defines the transmission of data both within the tractor and between the tractor and the implement, implemented using the CAN (Controller Area Network). It is also possible to monitor the desired information such as fuel consumption and engine load, as well as the needed draft force. Farming implements and tractors whose data transfer complies with an international standard are called ISOBUS machines. The aim of the study was to develop a cost-effective telematics system that can be used to monitor and record arable farming activities in real time. In accordance with the objectives, the requirements of the measuring equipment were determined for decoding and recording the messages of the CAN bus of the tractor. The tractor's CAN bus data was recorded using a Raspberry Pi microcomputer with CAN bus and GNSS measurement cards. The system was used to collect predefined tractor data from the bus, which was sent with location data in real time over the mobile phone network to a server computer. The measurement hardware and the server computer were programmed using the Node-RED programming tool. The information received on the server computer was stored in a MySQL database. Node-RED was also used to create a graphical user interface, from which any user could monitor the tractor's functions and location in real time and control the storage of data in the database. Testing of the measurement system was carried out at the Viikki research farm of University of Helsinki during the summer of 2023. The implemented measurement system successfully collected data on two tractors for different work tasks during silage harvesting. Retrieving and analysing the collected data from the database was easy, as the CAN messages were in a decoded format. The transfer of data between the measuring device and the server computer took place without any major delays. The telematics system could also be used for automatic real-time data analysis. Research shows that the CAN bus is a good way to gather information about farming field operations. In the future, the exploitation of measured data will be an essential part of agricultural practice, which aims both to improve the profitability of agriculture and to reduce its environmental impact.