Abstract: The paper presents results of investigations and the assessment of multi-stage fuel injection in MultiJet 1.3 engine operating under load conditions. Basic work parameters of the examined piston internal combustion engine, such as: effective power, torque, hour and unit fuel consumption and the concentration of the most important noxious components of exhaust gases were provided. Tests were conducted at the test bench stand that comprised the engine under consideration, eddy-current brake by Elektromex EMX company, control and measurement unit to control the test bench and to take measurements of parameters of the engine and brake work, the measurement system for fast-changing quantities, fuel-flow and air-flow meters, and the exhaust gas analyser. During the tests, the engine operated under load conditions at the crankshaft rotational speed: n=l200, 1750, 2400, 3800 and 4200 rpm. Such values of speed were selected because of the multi-stage fuel injection and the engine's being able to reach the maximum torque M=200Nm at the crankshaft rotational speed n = 1750 rpm and the maximum power output N=90HP, delivered at n=4200 rpm. Application of advanced engine technologies and advanced control system allowed meeting high requirements concerning energy and economic as well as environmental indices.
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