Browse Publications Technical Papers 2010-32-0124
2010-09-28

Impact of Oil Aging on Wear of Piston Ring and Cylinder Liner System 2010-32-0124

The piston ring and cylinder liner tribosystem is very sensitive. It is a heavily loaded system with high temperature and force exposure. High demands are made on the components in this area. These facts concern not only system components, but also the engine oil which can reach up to 300°C at the inner cylinder walls. High temperatures and force cause oil aging.
As a part of the combustion chamber, the piston ring-cylinder liner tribosystem is in close contact with combustion constituents. If alternative fuels like ethanol are used, the influences to this tribosystem have to be investigated. In particular, the impacts of oil aging have to be considered to avoid higher wear and damage to the engine, to assure low fuel consumption, and to extend oil change intervals. Research work on abrasion of the ring-cylinder system was aimed to gain detailed information about the effects on this tribosystem. This was realized by the use of different engine oils and the experimental consideration of the impacts of ethanol on the oil.
For wear measurement, a novel measuring method is used. This measurement device is based on online and continuous detection of radioactive isotopes as wear tracers. The measurement device has been integrated to a conventional passenger car with an SI engine. The research was done on a chassis dynamometer test bench.

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