Correlations among Ash-Related Oil Species in the Power Cylinder, Crankcase and the Exhaust Stream of a Heavy-Duty Diesel Engine

Watson, Simon; Huang, Wenwei; Wong, Victor W.

doi:10.4271/2007-01-1965

Cited by 13 publications

(1 citation statement)

References 9 publications

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“…And the inorganic metal salts are derived from metallic detergents and the tribo-film caused by zinc dialkyldithiophosphate (ZDDP) reacting with rubbing surfaces. 6,7 The deposits are mainly concentrated in the deep honing grooves totally covering them in places (thicknesses up to about 4 mm), while on the plateaus, deposits may form a thin film in range of 100-400 nm thickness. 8 However, compared with cast iron, the non-ferrous matrix in chromium coating will change the composition of tribo-film formed by anti-wear ZDDP additive and coating element, and the micro-cracks on chromium plating surface will affect the distribution of deposits significantly.…”

Section: Introductionmentioning

confidence: 99%

Deposit formation on chromium-plated cylinder liner in a fully formulated oil

Zhu

Han

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part J:

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Chromium plated cylinder has been wildly used in large bore diesel engines due to its light weight, good durability, and low induced liner wear. Deposits accumulated in the grooves and micro-crack on chromium plated cylinder could smooth the running surface, reduce the oil retention capability, and increase the engine's oil consumption. In the present research, deposit formation on chromium-plated cylinder in fully formulated oil under different loads and temperatures was investigated by using a reciprocating sliding tester. Surface analytical techniques such as SEM, EDX, and XPS have been used to gain the knowledge about deposits' origin, distribution, and factors affecting the deposit formation. The deposits are mainly derived from C, O, and S in the lubricating oil and anti-wear additive ZDDP (Zn and P). Deposits only accumulated in the depression (honing grooves and micro-cracks) on chromium plated cylinder surface, and there were no deposits found on the plateaus. The deposit formation increased with the increasing of load and temperature, and increased sharply over 60 MPa and 150 C. The deposit formation on liner surface was significantly different between chromium-plated coating and cast iron in component and distribution.

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Section: Introductionmentioning

confidence: 99%

Deposit formation on chromium-plated cylinder liner in a fully formulated oil

Zhu

Han

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part J:

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Lubrication and Friction

Wong

2014

Encyclopedia of Automotive Engineering

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This chapter describes in brief the basic lubrication and friction processes at the major engine components. It starts with a clarification of the common descriptors of mechanical losses and friction in the engine, followed by the topic of lubrication fundamentals such as lubrication regimes. Then the lubrication of the contacting surfaces in each of the major engine subsystems is discussed in turn. These subsystems include the piston assembly: ring‐pack/liner, piston‐skirt/liner, piston‐pin/connecting‐rod contacts; connecting rod and crankshaft bearings; and the valvetrain subsystem. The relative contributions to total friction from the various subsystems are discussed, with the piston‐assembly contributing to about half of the total friction. The remainder of the friction comes from the crankshaft, connecting rod, and camshaft bearings, and the valvetrain oscillating parts. The bearings are in predominantly hydrodynamic lubrication, in contrast to the valvetrain oscillating components, which are characterized to be mostly in the mixed/boundary lubrication regimes. Lubricating oil composition is discussed in the final section. It is generally believed that the bulk oil viscosity, with proper viscosity and (boundary) friction modification, could be controlled to lower component friction, in conjunction with antiwear additives. Effects of lubricant‐derived ash on diesel particulate filter ( DPF ) restriction are significant, with large differences observed among lubricant‐derived ash originating from different metallic‐based additives—such as among calcium, magnesium, or zinc compounds—at the same mass accumulation.

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Vanadia-Based Catalysts for Mobile SCR

Jansson

2014

Urea-SCR Technology for deNOx After Treatment of Diesel Exhausts

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Correlations among Ash-Related Oil Species in the Power Cylinder, Crankcase and the Exhaust Stream of a Heavy-Duty Diesel Engine

Cited by 13 publications

References 9 publications

Deposit formation on chromium-plated cylinder liner in a fully formulated oil

Deposit formation on chromium-plated cylinder liner in a fully formulated oil

Lubrication and Friction

Vanadia-Based Catalysts for Mobile SCR

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