| INVESTIGATION OF FRICTION LOSS CHARACTERISTICS OF ENGINE
PISTONS FOR DIFFERENT ENGINE OPERATING CONDITIONS |
| Jongdae Kang 1, Jinwoo Cho 2, Sungwook Park 3 |
1Department of Mechanical Convergence Engineering, Graduate School of Hanyang University
2Engine Functionality Test Team 1, Hyundai Motor Group
3School of Mechanical Engineering, Hanyang University |
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| ABSTRACT |
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In this study, the floating liner method is utilized to measure the friction generated in the piston assembly of a
single-cylinder gasoline engine. The piston assembly is subjected to combustion pressure, lubricating friction, and asperity
friction during engine operation and reciprocates within the cylinder. Therefore, the main goal of this study is to investigate
the effect of engine combustion and lubricant conditions on piston friction. First, we analyze how the combustion pressure,
obtained by changing the combustion load and the ignition timing, affects piston friction. Second, by adjusting engine speed
and coolant/oil temperature, we analyze how each condition affects piston friction. Through the experiments for each case, it
was confirmed that the friction increased as the combustion pressure increased under the same lubrication conditions. It was
also confirmed that the piston friction was significantly measured due to the increase in lubrication friction as the engine
speed increased. Finally, it was confirmed that as the temperature decreased, the oil viscosity increased, resulting in a large
friction loss. |
| Key Words:
Gasoline engine, Piston friction, Floating liner method, Lubricant, Combustion condition |
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Corresponding Author.
Sungwook Park , Email. 
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