Improving Exhaust Emissions of a CRDI Diesel Engine Using Oxyhydrogen in Dual-Fuel Mode

Common-rail direct injection (CRDI) diesel engines are widely used in various industrial and transportation sectors, but these engines emit large amounts of carbon dioxide and particulate matter. Both pollutants are major issues that need to be addressed urgently. Oxyhydrogen, produced by water electrolysis, is considered for clean energy and continuously studied for its potential to reduce engine emissions. Therefore, the research aims to study the performance and exhaust products of a CRDI diesel engine at constant speed under different loads, using dual-fuel modes of diesel combined with oxyhydrogen addition. Oxyhydrogen was generated in a reactor using 5% w/w potassium hydroxide at 150 W, producing hydrogen–oxygen concentrations ranging from 90 to 340 mL/min. The most outstanding performance was achieved by using the dual-fuel mode of diesel and oxyhydrogen at a flow rate of 340 mL/min, resulting in a 16% reduction in diesel consumption compared to the diesel-only mode. Additionally, the levels of exhaust products (carbon dioxide, carbon monoxide, and particulate matter) were reduced by more than 10%.