Abstract The increasing global environmental awareness, evidenced by recent worldwide calls for control of climate change and greenhouse emissions, has placed significant new technical mandates automotives to improve engine efficiency, which is directly related the production carbon dioxide, a major gas. Reduction parasitic losses vehicle, powertrain systems key component energy conservation. For efficiency improvement, various approaches include improvements in advanced combustion systems,...

Abstract This research investigated the wheel wear and tribological characteristics in wet, dry, minimum quantity lubrication (MQL) grinding of cast iron. Water-based Al2O3 diamond nanofluids were applied MQL process results compared with those pure water. During nanofluid grinding, a dense hard slurry layer was formed on surface could benefit performance. Experimental showed that G-ratio, defined as volume material removed per unit wear, be improved high-concentration nanofluids. Nanofluids...

Electric vehicle sales are growing globally in response to the move towards a greener environment and reduction greenhouse gas emissions. As any machine, grease lubricants will play significant role component life of these new power plants drivetrains. In this paper, lubrication electric vehicles (EVs) hybrid (HVs) be discussed terms performance requirements. Comparisons EVs HVs for requirements current internal combustion engines (ICEs) reviewed contrast major differences under different...

Revised Abstract Global automotive industries have recently switched development trends from the traditional powertrain mechanical components into digital transformation of electrification in advanced propulsion vehicles. This industrial impact on global trend designs has created an emerging technology for new systems such as hybrid electrical vehicles (HEV) or (EV). Advanced resulting regulations are intended to improve vehicle fuel efficiency and reduce transportation-related emissions...

Magneto-rheological (MR) fluid-based dampers can be used in suspensions to modify ride, handling, and suspension frequencies autos. We have developed a unique seal wear test method simulate the of rod seals dampers. In this test, material samples form rectangular coupons are immersed bath MR fluid, section is brought into contact with coupon. The loaded against coupon known normal force, variable-frequency reciprocating machine stroke back forth across surface. Test conditions such as load,...

Engine-related improvements such as more efficient engine components, improved oils, and high-performance coating materials, need to be verified in terms of their effects on the tribological performance piston ring/cylinder bore system. The main purpose this research is develop an abrasive wear model for system during steady-state operation by considering temperature, load, oil degradation, surface roughness, material properties. can used either theoretical modeling or integrated with finite...

The thermal conductivity of boron nitride/ethylene glycol (BN/EG) nanofluids was investigated by transient hot-wire method and two abnormal phenomena reported. One is the higher enhancement for BN/EG at very low-volume fraction particles, other synthesized with large BN nanoparticles (140 nm) which than that small (70 nm). chain-like loose aggregation responsible increment low particles volume fraction. And difference in specific surface area aspect ratio may be main reasons between...

A technique has been developed to form friction-reducing and antiwear films in-situ by means of an electric field applied between rubbing metal surfaces. Using this charging technique, the effectiveness zinc organodithiophosphate (ZDP) additives as friction reducing agents can be enhanced electrochemical reactions which surface coatings. The coatings formed on sliding surfaces compared with uncharged reduce up 35 percent. In addition, during process, are replenished protect from wear. steel...

This research project investigated the wheel wear and tribological characteristics in wet, dry minimum quantity lubrication (MQL) grinding of cast iron. Water-based Al2O3 diamond nanofluids were applied MQL process results compared with those pure water. During using nanofluids, a dense hard slurry layer was formed on surface could benefit performance. Experimental showed that G-ratio, volume vs. material removed, be improved high concentration nanofluids. Nanofluids benefits to reduce...

This printing supersedes the publication in July, 1988 Tribology Transactions pages 382-390 which Fig. 16 and Table 5 were omitted along with Discussion Closure. The electrochemical reactivities of four commercial zinc organodithiophosphate (ZDP) antiwear additives, each blended a common mineral oil, measured during thermal decomposition tests. results imply that reactions between products ZDP electrode surfaces produce surface coatings on cast iron electrodes. observation suggests methods...

Previous research has already extensively characterized the effects of a variety engine oils on performance. However, low-phosphorus oils, which are growing importance due to reduction automotive emissions, have not been studied much. This paper sets forth results an initial investigation involving friction and wear characteristics typical cylinder kit components from 3.8-liter, four-cylinder engine. For these tests, sections molybdenum-coated piston rings were oscillated against segments...