Diesel Engine Lubricating Oil Research Articles

The effect of palm oil diesel fuel contaminated lubricant on sliding wear of cast irons against mild steel

The effect of various percentages of palm oil diesel (POD) fuel contaminated lubricants on the wear characteristics of cast irons during sliding contact was investigated. This was done on three types of cast iron, namely spheroidal graphite, flake graphite and chilled cast iron against a mild steel disc configuration using a pin-on-disc type of friction and wear apparatus. The lubricants used for the test specimen were Mach 5 SAE 40 with various percentages of POD. For comparison purposes, pure diesel engine lubricant oil and pure palm oil diesel were also used as lubricants. The test conditions were as follows: pressure, 1 MPa; sliding speed, 0.2 m s −1; sliding distance, 56 km; room temperature, ∼30°C. It was observed that the addition of 5% palm oil diesel into the engine lubricant improves the performance of the lubricant in terms of anti-wear characteristics, reducing the wear rate of cast irons. The use of pure commercial (0% POD contamination) lubricant resulted in a moderate wear rate, whilst pure POD (100%) lubricant produced the highest wear rate compared with the other combinations of contaminated lubricants.

A prognostic maintenance system based on the Hough Transformation

An automated predictive maintenance system has been developed based on the Hough Transform. The Hough Transform, used in image processing to extract geometrical primitives from image data, has been adapted to extract linear trend features from monitored data. The predictive maintenance system uses the extracted trend features to diagnose incipient fault conditions. It then predicts the time for the system to reach a critical fault condition. The transform provides an early warning of a developing fault allowing operating staff to anticipate the types of maintenance required before secondary damage and complete breakdown occurs. It can also deal robustly with noisy data, including impulsive noise. It is proposed that logistic curves may be useful for the empirical description of wear failure. A multi-point generalisation of the Hough Transform (Flint et al, 1992) was developed for extracting logistic features from developing fault signatures. The new generalisation of the Hough Transform differs from earlier generalisations by incorporating early data fusion to reduce the size of previously large cumbersome arrays. A brief description is given of the Hough Transform's application to two predictive maintenance case studies. The first case study is the uni-feature problem of providing predictive maintenance decisions for a diesel-engine lubricating oil system. The subject of the second case study is a pneumatic sliding-door system. Here a multivariate generalisation of the Hough Transform is required. The proposed generalisation involves the accumulation of vector rather than scalar votes in an array.

Closure to “Discussion of ‘Purification of Diesel-Engine Lubricating Oil’” (1930, Trans. ASME, 52(9), pp. 96–97)

Closure to “Discussion of ‘Purification of Diesel-Engine Lubricating Oil’” (1930, Trans. ASME, 52(9), pp. 96–97)

Closure to “Discussions of ‘Service Characteristics of Diesel-Engine Lubricating Oil’” (1930, Trans. ASME, 52(9), pp. 10–12)

Closure to “Discussions of ‘Service Characteristics of Diesel-Engine Lubricating Oil’” (1930, Trans. ASME, 52(9), pp. 10–12)

Purification of Diesel-Engine Lubricating Oil

Abstract The paper is a continuation of earlier research on a 10 by 12 Diesel engine. Its most important novelty appears to be a reference to avoiding dilution of the lubricating oil from mechanical leakage, an explicit statement upon this subject being contained in the paper. Deterioration of the lubricating oil and its increasing contamination with various substances not originally present are again shown as a function of operating power, and emphasis is placed on the large percentage of products resulting from cracking. It is not stated, however, whether the cracking products are traceable to the fuel or to the lubricating oil.

Service Characteristics of Diesel-Engine Lubricating Oil

Abstract Diesel-engine lubrication has presented difficulties owing to the high compression pressures and the high temperatures and to the great weight of engine parts. Results are given of a study of the progressive record of the characteristics of the lubricating oil used in a Diesel engine in regular service for about a year installed in a freight-switching locomotive running 23 hours of the day.