2025, Vol. 12, No. 1. - go to content...

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DOI: 10.15862/17NZOR125 (https://doi.org/10.15862/17NZOR125)

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Filimonov M.D., Matveeva E.A. Checking the influence of the twist coefficient on the final length of wire blanks for critical vehicle circuits in the design documentation of wire harnesses. Russian journal of resources, conservation and recycling. 2025; 12(1). Available at: https://resources.today/PDF/17NZOR125.pdf (in Russian). DOI: 10.15862/17NZOR125

Checking the influence of the twist coefficient on the final length of wire blanks for critical vehicle circuits in the design documentation of wire harnesses

Filimonov Mikhail Dmitrievic
Volga Region State University of Telecommunications and Informatics, Samara, Russia
E-mail: Filimonov_md@mail.ru
RSCI: https://elibrary.ru/author_profile.asp?id=1266000

Matveeva Elena Alexandrovna
Volga Region State University of Telecommunications and Informatics, Samara, Russia
E-mail: helen_matveeva@mail.ru
ORCID: https://orcid.org/0000-0003-0582-2620
RSCI: https://elibrary.ru/author_profile.asp?id=83169

Abstract. This article describes the system of interaction of various electronic units and blocks of modern cars, as well as the importance of protecting data exchange lines from interference. The automotive industry in modern conditions is distinguished by a significant presence of electronic systems interconnected. The systems are usually controlled by a controller. For the correct operation of the systems, information about the operating devices is required, which allows you to adjust the engine operation. To ensure the operability of all systems, it is necessary to provide communication between the main control units. Since the units are located in different parts of the car, it is necessary to calculate the lengths of the inter-unit connections. If such calculations are not carried out, then interference may occur in the system, negatively affecting the operability of the system. One of the used options for interference-proof connection is twisted pair, in the production of which the length of the blanks is obviously greater than the final length between the devices.

The article defines formulas for calculating the wire twist coefficient depending on the parameters of the twisted wires, such as the outer diameter and twist pitch. The twist coefficient is calculated for the most common wire configurations: 2, 3, 4 wires, external diameters by the cross-sections of the conductive core from 0,35 to 2,0 mm², and twist pitches of 30 mm. The issue of automation and accounting of twist coefficients is addressed. Approximate losses in wire consumption for a modern domestic passenger car are determined in the absence of these coefficients in the calculation.

Keywords: CAN bus; twist; twist pitch; twist coefficient; wire length; turn diameter; insulation diameter; noise immunity

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