APPLICATION OF INFORMATION TECHNOLOGIES AND MICROPROCESSOR TECHNIQUES FOR CARRYING OUT MEASUREMENTS IN VEHICLES

Abstract

Problem. The subject of research is the fundamental possibility of using modern information technologies based on microprocessor technology for obtaining, storing and processing measurement information. In particular, the use of the Arduino microprocessor platform for measuring high (up to 1200°C) temperatures of gas flows. Goal. The purpose of the research is to create a measuring system for measuring high (over 1000ºС) temperatures of gaseous media in vehicles based on the Arduino microprocessor platform using thermocouples. Research objectives. In order to implement the proposed system based on modern information technologies, it is necessary to solve a number of tasks: 1. To solve the fundamental question regarding the possibility of measuring low voltage values (units of millivolts) using the Arduino microprocessor platform; 2. Develop a program algorithm for calculating the thermocouple junction temperature based on millivoltmeter readings; 3. Experimentally test an intelligent hightemperature measuring system based on the Arduino microprocessor platform, which automatically calculates possible measurement errors during a real experiment. Methodology. For conducting the experiment, a chromel-alumel type thermocouple with a matching module MAX6675 was used, which combines an operational amplifier and a converter into an SPI interface. The diagram of the assembled experimental setup is given. The thermocouple and matching module are connected to the Arduino Uno board, which is connected by a USB cable to the computer. The following results are received. Тhe possibility of measuring voltage up to 1 V using the Arduino microprocessor platform has been confirmed. The gas flow temperature was measured at several points in the range of 1100-1150ºС with sufficient accuracy. The experiment showed a fundamental possibility of implementing the proposed method. Conclusions. Designed, assembled, programmed with a specially developed program and experimentally verified method of measuring high temperatures of gas flows based on the Arduino microprocessor platform. Experimental testing in conditions as close as possible to real ones showed that the developed method and the electronic circuit implementing it are operational and can be used for such measurements.