Development of Low-Ash Type Heavy Duty Diesel Engine Oil for After-Treatment Devices

Kurihara, Isao; Takeshima, Shigeki; Yashima, Hiroshi

doi:10.4271/2004-01-1955

Cited by 8 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, no changes were recorded in the filter back-pressure due to the possible sulfate ash stored in the CRDPF. The results are in agreement with Givens et al (20), Kurihara et al (33), and Nemoto et al (23), who all have shown that a main component of ash deposited on DPF is calcium sulfate (CaSO 4). Givens at al.…”

Section: Discussionsupporting

confidence: 92%

“…(20) found the quantity of ash deposited on the DPF to be directly proportional to sulfated ash level in the fresh lubricant. Both Kurihara et al (33) and Nemoto et al (23) found less ash accumulation in the DPF with low sulfated ash oils. Being also in agreement with the present study, Hall et al (19) found the formation of nucleation particles to be eliminated using low sulfur fuel and lubricant combinations in a diesel engine equipped with a catalyzed DPF.…”

Section: Discussionmentioning

confidence: 91%

See 1 more Smart Citation

Effect of Lubricant on the Formation of Heavy-Duty Diesel Exhaust Nanoparticles

Vaaraslahti

Keskinen

Giechaskiel

et al. 2005

Environ. Sci. Technol.

112

103

View full text Add to dashboard Cite

The effect of lubricants on nanoparticle formation in heavy-duty diesel exhaust with and without a continuously regenerating diesel particulate filter (CRDPF) is studied. A partial flow sampling system with a particle size distribution measurement starting from 3 nm, approximately, is used. Tests are conducted using four different lubricant formulations, a very low sulfur content fuel, and four steady-state driving modes. A well-documented test procedure was followed for each test. Two different kinds of nanoparticle formation were observed, and both were found to be affected bythe lubricant but in differentway. Without CRDPF, nanoparticles were observed at low loads. No correlation between lubricant sulfur and these nanoparticles was found. These nanoparticles are suggested to form mainly from hydrocarbons. With CRDPF, installed nanoparticles were formed only at high load. The formation correlated positively with the lubricant (and fuel) sulfur level, suggesting that sulfuric compounds are the main nucleating species in this situation. Storage effects of CRDPF had an effect on nanoparticle concentration as the emissions of nanoparticles decreased over time.

show abstract

Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 91%

Effect of Lubricant on the Formation of Heavy-Duty Diesel Exhaust Nanoparticles

Vaaraslahti

Keskinen

Giechaskiel

et al. 2005

Environ. Sci. Technol.

112

103

View full text Add to dashboard Cite

show abstract

“…For instance, ash accumulation in DPFs, if in excess, decreases the ability of the DPF to be fully regenerated, thereby increasing engine back-pressure and reducing fuel economy. A recent review specifically on the effects of SAPS has been made by Bodek and Wong [24], in which data on both accelerated tests and field tests show mostly irreversible increased back pressure with ash accumulation [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41].…”

Section: Exhaust Ash Emissionsmentioning

confidence: 99%

Bridging macroscopic lubricant transport and surface tribochemical investigations in reciprocating engines

Wong

Thomas

Watson

2007

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

Engine design studies are often conducted with one of two distinct focuses on two different scales: overall engine analysis or localized surface analysis. However, recent engine research requires a more combined approach. Classical tribological experiments and models have been developed usually for general contacting surfaces under specific operating conditions. They attempt to simulate the actual engine environment, which varies significantly with component design and engine operating conditions. Macroscopic engine studies, on the other hand, yield information pertaining to the overall engine system, such as component dynamics, lubricant flow, pressures, and temperatures. These macroscopic operating parameters serve as boundary conditions to the localized surface or tribochemical problem. This paper discusses the macroscopic oil transport processes in the engine and presents several current engine performance problems, such as in friction reduction, modelling wear with antiwear tribofilms, and minimizing deposit formation and emission of ash-related species. It also illustrates applications of the combined analysis of bulk oil transport in the engine with material surface phenomena and tribochemistry. A specific example involves the oil supply to the piston ring-pack and changes in oil and additive characteristics in that region.

show abstract