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Piston friction force with EGR activated
Institution:1. Energy Efficiency Research Division, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea;2. Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 151-0041, Japan;3. Department of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea
Abstract:The piston friction force increases in the latter half of the compression stroke where the EGR system is activated, while the force is decreased at each stroke center. This is due to the soot contained in the EGR gas. Although tho reduction of piston friction force at the stroke center reduces the piston friction loss, the increase of friction force in the latter half of compression stroke is caused by the friction coefficient, which becomes higher at this point. Hence it can be anticipated that wear on the piston rings and cylinders would increase accordingly. The change in piston friction force characteristics with the mixture of soot is quite an interesting phenomenon, and further studies on this phenomenon, are expected.
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