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Study of Base Number Estimation Method for Engine Oil Deterioration Monitoring System

Article of Honda R&D Technical Review Vol.18 No.2

Summary

In this research project, technology for estimating the base number (BN) deterioration, used as an index for judging engine oil deterioration, was developed. A detailed investigation using an NOx bubbling unit was carried out, and as a result it was found that the speed at which the BN falls is determined mainly by heat and NOx. In addition, a detailed analysis was carried out, and it was found that the reduction speed can be expressed using the differential rate law. A study of the possibility of estimating reduction of the BN in an actual engine was carried out using a BN deterioration equation. The results of this study showed that it was possible to adequately estimate the BN. This indicated that it is possible to estimate the reduction of the BN on-board by the engine control unit (ECU).

Reference

(1) Sakurai, T.: Sekiyuseihintenkazai, SAIWAI SHOBO, p. 287 (1973) (in Japanese)
(2) Konishi, S., Kamita, T.: Principle and Application to Lubricating Oil, Corona Publishing Co., Ltd., p. 144 (1992)
(3) Inoue, K., Yamanaka, Y.: Change in Performance of Engine Oils with Degradation, SAE Paper 902122
(4) Murakami, Y., Aihara, H., Kuniya, J.: Analysis of Mechanism Intermixing Combustion Products in Engine Oil, Transactions of The Japan Society of Mechanical Engineers (B edition), Vol. 53, No. 496, p. 3814-3821 (1987)
(5) Murakami, Y., Aihara, H.: Effects of NOx and Unburned Gasoline on Low Temperature Sludge Formulation in Engine Oil, SAE Paper 910747
(6) Kawaguchi, S., Nishimoto, K.: Butsuri Kagaku Josetsu, Kagaku-Dojin Publishing Company, Inc, p. 97-98 (1985) (in Japanese)
(7) Murakami, Y., Aihara, H.: Analysis of Mechanism Intermixing Combustion Products in Engine Oil (Continued Report), Transactions of The Japan Society of Mechanical Engineers (B edition), Vol. 55, No. 519, p. 3571-3580 (1988)

Author (organization or company)

Koichiro AIKAWA(Automobile R&D Center)、Masashi MARUYAMA(Automobile R&D Center)

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