INFLUENCE OF FUEL SUPPLY CORRECTION ON THE EXTERNAL SPEED CHARACTERISTIC OF A DIESEL ENGINE DRIVING POWER EQUIPMENT OF ROAD MACHINES UNDER OPERATING CONDITIONS
Authors:   National Transport University, Moroz Valentyn , Kovbasenko Sergii ,   National Transport University, Levkivskyi Sergii ,   National Transport University, Simonenko Vitalii 
Published: December 2024

Summary. The paper considers the issue of improving fuel efficiency and reducing emissions of harmful substances from diesel exhaust gases, which is the source of energy for driving the working equipment of road machines operating in traction modes and during transport work under operating conditions, namely plough and plough-brush snow ploughs based on a pneumatic wheeled tractor.
The object of research is to improve fuel efficiency and reduce emissions of harmful substances from the exhaust gases of the diesel engine driving the working equipment of road machines.
The aim of the study is to improve fuel efficiency and reduce emissions of harmful substances from the exhaust gases of the 4Ч11.0/12.5 diesel engine (D-240, D-241, D-242, D-243 families), which is the source of energy for the drive of working equipment and the mechanism for moving plough and plough-brush snowplows by adjusting the all-mode fuel supply corrector, mechanical, centrifugal regulator of the high-pressure diesel fuel pump under operating conditions and the effect of this setting on the external speed characteristics of the diesel engine, namely maximum power Ne, maximum torque Mк; hourly fuel and air consumption Gпал and Gпов, specific effective fuel consumption ge; concentrations of harmful substances in exhaust gases: carbon monoxide CO, hydrocarbon compounds СmHn, nitrogen oxides NOx and smoke N of exhaust gases.
The paper presents the results of experimental studies to determine the energy performance (maximum power Ne and maximum torque Mк) of a diesel engine (4Ч11.0/12.5 (D-242)) of power equipment; fuel efficiency indicators (hourly fuel consumption Gпал and specific effective fuel consumption ge); hourly air consumption Gпов; and concentrations of harmful substances in exhaust gases: carbon monoxide CO, hydrocarbon compounds СmНn, nitrogen oxides NOx and smoke N of exhaust gases. These were obtained at the position of the fuel injection control unit corresponding to the maximum fuel supply depending on the diesel crankshaft speed. The above indicators were determined with the changed settings of the fuel supply corrector of the all-mode, mechanical, centrifugal regulator of the high-pressure diesel fuel pump.
Based on the obtained external speed characteristics of Ne, Mк, Gпал, ge, Gпов, CO, СmNn, NOx, and N, mathematical (polynomial) dependencies describing them on the diesel crankshaft rotation frequency were determined and their adequacy was checked.
The conducted research allowed us to determine the main direction of improving fuel efficiency and reducing emissions of harmful substances from diesel exhaust gases in the conditions of road vehicles operation.
Keywords: Fuel injection corrector, regulator, external speed characteristics, energy and environmental indicators, fuel efficiency, harmful substances, exhaust gases, operating conditions, polynomial models, adequacy.