This paper is dedicated to solving the problem of reducing the nitrogen oxides content in exhaust gases while ensuring internal combustion engines fuel economy. Nitrogen oxides are the most toxic component of car exhaust. At the same time, the list of existing technologies that ensure the reduction of nitrogen oxides emissions while maintaining the engines fuel economy is very limited. Almost all the methods used to reduce the nitrogen oxides emission consist in a certain deforcing of the working process and, as a result, an increase in the specific fuel consumption. As a solution to this problem, the authors proposed the waste heat engine with an external heat supply and internal vapor generation. This engine is based on the PD-10U (ПД-10У) two-stroke starting engine, from which standard fuel and ignition systems were dismantled. Exhaust gases enter it, they are compressed, and then water is injected. The composition of the gas-vapor mixture in the cylinders undergoes complex changes; the presence of water vapor in the system at a temperature of 1,500ºС leads to thermal dissociation of its molecules, which makes possible to oxidize toxic components. In addition, the use of the waste heat engine allows generating additional power by utilizing the heat of the exhaust gases.
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