Estudo e elaboração de uma rede CAN-j1939 embarcada para aplicação em um sistema de bordo agrícola

Abstract

This project aimed to develop a CAN communication type J1939 between an agricultural onboard computer and a terrain location and compensation ECU. It proposes the combination of the onboard computer's geopositioning system with the threeaxis movement information from the terrain compensation ECU, with the aim of reducing the use of electronic components in the manufacture of the system, which has become a growing concern because of a component shortage between the years 2020 and 2022. This work begins with a brief introduction to the onboard computer and its respective ECU. Next, the project objectives and the basic characteristics of the microcontroller and the software used here are explained. Subsequently, a literature review is carried out on the following topics: CAN network, J1939 and its standards, GPS, NMEA and RTOS. During development, modifications made to hardware, software projects and tests are detailed. In the software project, the highlights are writing functions in C language to manipulate data coming from a GPS module and sending SAEJ1939 type messages to the terrain compensation ECU. In the test project, the series of tests carried out on a bench and on a tractor stand out, as well as how the test data were obtained and what information can be obtained from them. Finally, this work presents an analysis of this information obtained from the tests together with the conclusion.