Experimental for depicting the influence upon gaseous emissions of an Otto engine by using hydrogen as fuel addition

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Abstract Due to the higher pollution restrictions implemented globally upon the internal combustion engines, for new but also older vehicles, suitable solutions must be found, for solving major, attested incriminations concerning pollution. The present research focuses on the possibility of the reduction of the emission concentration values emitted by a classic Otto spark ignition engine (Otto ICE), by adding hydrogen to the normal used fuel (gasoline). The hydrogen is generated via a water electrolytic conversion technology, applied, in symbiosis with the internal combustion engine and it is known as hydrogen air (HHA). The hydrogen quantity, as resulted from the HHA generating process and fuelled into the engine, represents 10% (by volume) of the total volume of the intake capacity. Being directly correlated to the stoichiometric ratio used to create the fuel mixture, the intake of hydrogen is finally controlled; therefore, the total calorific power of the new fuel mixtures is increasing by approximate 30%. All the measurements have been achieved in a lab using certified and approved gas analyzers and measurement instruments. The novelty of the research consists of (i) presenting results of measurements with the gas analyzer, one at an engine speed of 800 RPM and the second at 2000 RPM using only gasoline as fuel (normal or standard fuel); (ii) concluding of comparative measurements at the same engine speeds, but with addition of hydrogen in the fuel mixture. Since carbon dioxide makes up the vast majority of greenhouse emissions, the results indicate also a more reduced CO2 concentration in the exhaust. One presents that the electrolytic convertor is capable of producing 1800 litters of HHO gas from 1 litre of water. By upgrading the oxyhydrogen system, one succeeded to produce more HHO gas and replacing the amount of conventional fuel. As conclusions one demonstrated that lower emission values can be obtained with the addition of hydrogen air (HHA).