DESIGN FEATURES OF SUPERCHARGING SYSTEMS FOR MODERN AUTOMOTIVE DIESELS BASED ON AIR CHARGE PRESSURE SPEED CHARACTERISTICS

In modern global diesel engine manufacturing, the possibilities for improving the efficiency of in-cylinder working processes in automotive small-displacement diesel engines have been largely exhausted. At the same time, the issue of optimizing diesel engine operation across the entire range of operating modes – from idle speed to rated crankshaft rotational speed – remains insufficiently researched. Ukrainian engine manufacturing potential, despite the absence of mass production, has significant developments in the field of research into operating modes of such diesels, including the development of criteria for forming external speed characteristics and an innovative approach to designing supercharging systems for modern automotive diesel engines. The proposed approach is based on air charge pressure speed characteristics and involves the use of a combination of modern software tools for solving research problems and developing connection schemes for supercharging system components. The developed solutions have potential for implementation in the global market for modern automotive diesel design and for increasing the competitiveness of domestic developments in this field. As an example of the viability of the proposed approach, optimization has been conducted based on the obtained analytical dependence for the domestic automotive six-cylinder diesel engine 6DTNA1 (6ChN 8.8/8.2), and necessary graphs of dependencies between optimal brake mean effective pressure and rational supercharging pressure versus crankshaft rotational speed under external speed characteristic conditions have been constructed. Based on these dependencies, a progressive supercharging system has been selected for the domestic small-displacement diesel engine 6DTNA1, and a proposed connection scheme for its components has been developed.