Projeto preliminar de um sistema de frenagem regenerativa pneumática aplicado a caminhões truck

Abstract

This work analyzes the influence of a pneumatic regenerative braking system, in which pneumatic potential energy is applied to control pressure in the combustion chamber of a diesel engine. The variation in efficiency is quantified using theoretical, numerical, and experimental methods. The current global situation for the automobile industry presents restrictions regarding pollution emission levels, and the turbocharger presents an excellent alternative to reduce consumption and emissions. However, it has points of lower efficiency, which can be corrected by a supplementary system, achieving even better results. The initial study was aimed at the variation in turbine pressures according to vehicle rotation and analysis of specific consumption under these conditions. Through this data, the limitations of the turbocharger can be found, and it can be understood where to apply a supplementary system to obtain improvements in consumption. To better understand the behavior of the pneumatic regenerative braking system in different situations, a test is prepared for different situations, and a simulation of the operation is carried out. The results indicate a significant gain in energy efficiency for low or very high engine speed situations where the turbine alone has limitations.