Abstract
This paper presents a solution for an injection system of a diesel engine, that uses gas mixture, consisting of diesel and gas (CNG - Compressed Natural Gas), which proves to be more advantageous of economically but also ecologically aspects. The ecological aspects are not treated widely on this paper. These claims are proved by experimental tests that were made for this purpose, both in Germany and Romania, and analyzed on the local public transport company in Saarbrucken city, Germany. The park fleet is equipped with such systems, installed on buses for public transport, and they took into account all stakeholders, namely the experience gained over decades in this field, the technology and the specialists with whom they collaborate, the desire for collaboration. The new injection system improoves the power charactersitics of the engine and decrease noxes.
Keywords: diesel, LPG, CNG, methane number, combustion mixture