The study presents the development, integration, and experimental evaluation of a microcontroller-based diesel fuel temperature monitoring system designed for the ND-21 fuel pump installed on the KI-15711 test bench. The purpose of this work is to enhance the accuracy and efficiency of fuel temperature control by implementing a multi-point digital measurement subsystem based on the Arduino Uno R3 platform. The system architecture includes waterproof DS18B20 digital temperature sensors mounted in brass protective sleeves and positioned in three control points of the fuel supply line: the fuel tank, the pump inlet, and the pump outlet. A dedicated electronic module with 1-Wire communication, signal averaging, serial data transfer, and LCD visualization was developed. Calibration performed using a mercury thermometer produced a correction coefficient of 0.985, reducing the measurement error to ±0.2 °C. Experimental investigations demonstrated that the temperature difference ΔT between the pump inlet and outlet increases proportionally to the pump speed. At frequencies ranging from 800 to 1800 rpm, ΔT varied from 0.4 to 1.1 °C. The system exhibited thermal inertia during the first 120 seconds of operation, followed by temperature stabilization after 600 seconds. An analytical approximation describing the relationship between ΔT and pump speed was obtained: ΔT = 0.25 + 0.00045·n. The scientific novelty of the study lies in the first-time integration of DS18B20 sensors into the actual ND-21 fuel supply system, enabling direct analysis of thermal characteristics under real operating conditions. Practical significance is expressed in the reduction of measurement system cost by more than three times compared to conventional industrial sensors while maintaining the required accuracy and ensuring multi-point monitoring capabilities. Future research should focus on the development of an automated electrical preheating system, expansion of sensor functionality to include flow and pressure measurement, and the creation of a fully automated control system for the D-21 diesel fuel supply.

Arduino Uno R3, DS18B20, temperature sensor, diesel fuel, ND-21 fuel pump, fuel supply system, measuring module

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