Simulation study on the effect of timing system to technical features and emissions of a small single-cylinder gasoline engine

Abstract

This paper investigatesthe change of technical features and emission of a singlecylinder gasoline engine using AVL-Bootsimulation software in the following
modes: small load (20% load), medium load (50%) and large load (90% load)
while the engine working at 5000 rpm. The late intake valve closing and early
exhaust valve opening were changed in the range of 20 to 40compared to the
original angles.The engine runs at different speeds corresponding to determined
optimal air distributions, ensuring peak load factor.In small load mode, the late
intake valve closing and early exhaust valve openinghave smaller changes than
the original angle in order to increase the technical features and reduce engine
emissions. In mediumload mode, the enginewas designed to work best at 5000
rpm, thus the original angle is optimal. In large load mode, the angle underwent
major changes compared to the original angle in order to achieve the optimum
angle of the engine. The research results serve as the basis for structure
improvement andintelligent control system design of single-cylinder engines, in
order to achieve optimal performance at different load modes.