Visual study of capabilities of managing IC engine filling degree vs engine ecological indicators

¹ Opole University of Technology, Department of Vehicles, 5 Mikolajczyka St., Opole, Poland
² Opole University of Technology, Department of Environmental Engineering, 5 Mikolajczyka St., Opole, Poland

^⁎ Corresponding author: s.kolodziej@po.opole.pl

Abstract

The operation of an internal combustion engine in a transient state is related to constant changes in cylinder filling degree. Managing a steady course of engine torque demands constant corrections in the volume of air delivered to the engine. In this work, different engine throttle management strategies were analyzed. The effect of throttle velocity on emissions was depicted. The research has shown that the greatest value of work density is reached by the IC engine for relatively low values of throttle angle. For shown values, disturbances in air flow in engine intake which may adversely affect emissions due to uneven cylinder filling were researched with the use of Digital Particle Image Velocimetry. The conducted research has shown significant unevennes in air supply to individual cylinders in the engine. This effect may cause discrepancies in air excess ratio for each cylinder, and result in heightened harmful substance emission.