UNIVERSITY OF PITESTI SCIENTIFIC BULLETIN Faculty of Mechanics and Technology AUTOMOTIVE series, year XXIV, no. 28 Carbon Dioxide Control Technologies for Diesel Engines S Tarulescu * , R Tarulescu and C I Leahu Transilvania University of Brasov, Eroilor Boulevard Nr. 29, Romania * Corresponding author e-mail: s.tarulescu@unitbv.ro Article history Received 11.07.2017 Accepted 18.09.2017 DOI https://doi.org/10.26825/bup.ar.2018.009 Abstract. The main pollutants contributed by internal combustion engines are CO, NO x unburned hydro-carbons (HC) and particulate emissions. In addition to this, all fuel burning systems emit CO 2 in large quantities and this is concerned with the Green House Effect which is going to decide the health of earth. In theory, on average, Diesel engines emit 20% less CO 2 than gasoline engines, but, depending to the fuel consumption, or engine regime, can reach high values. The paper presents researches on exhaust gases quality for an experimental single cylinder Diesel engine. The tests were made on an AVL single cylinder test bed for single cylinder engine (AVL 510 cc Single Cylinder Engine Type 5402). The quality of the exhaust gases, and the amount of CO 2 produced for different regimes and injection strategies, for this engine, were analyzed and compared with the theoretical principles. In conclusion, different CO 2 reduction strategies were compared, in order to find the optimal solutions. 1. Introduction Global climate change is one of the most significant long-term policy challenges. In recent years, fuel consumption standards and greenhouse gas emission (GHG) standards limiting carbon dioxide, methane, and nitrous oxide have created a new challenge for engine and vehicle manufacturers [1]. Carbon dioxide does not directly impair human health, but it is a “greenhouse gas” that traps the earth’s heat and contributes to the potential for global warming [2]. Due to the last environmental regulations set emitted by the European Union, engine researchers are testing and developing various emission reduction strategies for compression ignition engines. Combustion resulting from compression ignition diesel engines contains high levels of nitrogen oxides (NO x ), particulate matter (PM2.5 and PM10), hydrocarbons (HC) and small quantities of carbon monoxide (CO) and carbon dioxide (CO 2 ) [5]. Diesel engines emit 20% less CO 2 than gasoline engines, but, depending to the fuel consumption, or engine regime, can reach high values. Nevertheless, the amount of CO 2 , which is linearly correlated with fuel consumption, produced on the road can be up to 30% higher than official measurements indicate, in particular for Diesel