An automotive engine charge-air intake conditioner system: Thermodynamic analysis of performance characteristics

Taitt, D.W.; Garner, Colin P.; Swain, E.; Bassett, Michael; Pearson, Richard; Turner, J. W. G.

doi:10.1243/095440705x6587

Cited by 10 publications

(3 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The combustion efficiency can also be increased as the intake manifold temperature was reduced by the 'expansion effect'; this may enable advancement of the spark timing to occur depending on the increase in the residual gas fraction which results from the higher exhaust back pressure. The undesirable test results finally achieved by Turner et al 85 were studied by Taitt et al 87 They proved that, for the components used on the investigated engine, it was the low isentropic efficiencies that prevented the necessary reduction in the temperature of the inlet charge air.…”

Section: Low-end Torque Enhancementmentioning

confidence: 98%

Observations on and potential trends for mechanically supercharging a downsized passenger car engine:a review

Turner

Akehurst

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

Engine downsizing is a proven approach for achieving a superior fuel efficiency. It is conventionally achieved by reducing the swept volume of the engine and by employing some means of increasing the specific output to achieve the desired installed engine power, usually in the form of an exhaust-driven turbocharger. However, because of the perceptible time needed for the turbocharger system to generate the required boost pressure, a characteristic of turbocharged engines is their degraded driveability in comparison with those of their naturally aspirated counterparts. Mechanical supercharging refers to the technology that compresses the intake air using the energy taken directly from the engine crankshaft. It is anticipated that engine downsizing which is realised either solely by a supercharger or by a combination of a supercharger and a turbocharger will enhance a vehicle's driveability without significantly compromising the fuel consumption at an engine level compared with the downsizing by turbocharging. The capability of the supercharger system to eliminate the high exhaust back pressure, to reduce the pulsation interference and to mitigate the surge issue of a turbocharged engine in a compound-charging system offsets some of the fuel consumption penalty incurred in driving the supercharger. This, combined with an optimised down-speeding strategy, can further improve the fuel efficiency performance of a downsized engine while still enhancing its driveability and performance at a vehicle level. This paper first reviews the fundamentals and the types of supercharger that are currently used, or have been used, in passenger car engines. Next, the relationships between the downsizing, the driveability and the down-speeding are introduced to identify the improved synergies between the engine and the boosting machine. Then, mass production and prototype downsized supercharged passenger car engines are briefly described, followed by a detailed review of the current stateof-the-art supercharging technologies that are in production as opposed to the approaches that are currently only being investigated at a research level. Finally, the trends for mechanically supercharging a passenger car engine are discussed, with the aim of identifying potential development directions for the future. Enhancement of the low-end torque, improvement in the transient driveability and reduction in low-load parasitic losses are the three main development directions for a supercharger system, among which the adoption of a continuously variable transmission to decouple the supercharger speed from the engine speed, improvement of the compressor isentropic and volumetric efficiency and innovation of the supercharger mechanism seem to be the potential trend for mechanically supercharging a passenger car engine.

show abstract

Section: Low-end Torque Enhancementmentioning

confidence: 98%

Observations on and potential trends for mechanically supercharging a downsized passenger car engine:a review

Turner

Akehurst

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…Besides, CACs are another extraordinarily effective method for increasing ICE power density, which have been studied since the 1980s [56]. Nowadays, with the promotion of liquid cooling applications, liquid cooling CAC have now replaced the conventional air cooling CAC, as liquid cooling CAC exhibits full boost power and a faster acceleration response, as well as better fuel economy compared to traditional air cooling CACs [56][57][58][59], and thus the overall packaging volume and compartment weight could be reduced [60,61]. Additionally, to lower the lubricating oil temperature during cold start up, oil cooling systems began to be adopted in the 1990s [62,63], They are beneficial to reduce NOx and HC emissions [64,65].…”

Section: Combination With Other Cooling Circuitsmentioning

confidence: 99%

Advances in Integrated Vehicle Thermal Management and Numerical Simulation

et al. 2017

View full text Add to dashboard Cite

Abstract:With the increasing demands for vehicle dynamic performance, economy, safety and comfort, and with ever stricter laws concerning energy conservation and emissions, vehicle power systems are becoming much more complex. To pursue high efficiency and light weight in automobile design, the power system and its vehicle integrated thermal management (VITM) system have attracted widespread attention as the major components of modern vehicle technology. Regarding the internal combustion engine vehicle (ICEV), its integrated thermal management (ITM) mainly contains internal combustion engine (ICE) cooling, turbo-charged cooling, exhaust gas recirculation (EGR) cooling, lubrication cooling and air conditioning (AC) or heat pump (HP). As for electric vehicles (EVs), the ITM mainly includes battery cooling/preheating, electric machines (EM) cooling and AC or HP. With the rational effective and comprehensive control over the mentioned dynamic devices and thermal components, the modern VITM can realize collaborative optimization of multiple thermodynamic processes from the aspect of system integration. Furthermore, the computer-aided calculation and numerical simulation have been the significant design methods, especially for complex VITM. The 1D programming can correlate multi-thermal components and the 3D simulating can develop structuralized and modularized design. Additionally, co-simulations can virtualize simulation of various thermo-hydraulic behaviors under the vehicle transient operational conditions. This article reviews relevant researching work and current advances in the ever broadening field of modern vehicle thermal management (VTM). Based on the systematic summaries of the design methods and applications of ITM, future tasks and proposals are presented. This article aims to promote innovation of ITM, strengthen the precise control and the performance predictable ability, furthermore, to enhance the level of research and development (R&D).

show abstract

“…In the later engine test investigation by Turner et al, the results were unfortunately unrealistic. Taitt et al 36 proved that for the isentropic efficiencies of the components used on the engine investigated, the system was not capable of delivering significant reductions in the inlet charge air temperature. This also indicated that system effectiveness is the least sensitive to compressor isentropic efficiency and the most sensitive to inter-cooler effectiveness, with the sensitivity of the expander isentropic efficiency being in between.…”

Section: Strategies For Optimizing the Gas Exchange Processmentioning

confidence: 99%

Novel approaches to improve the gas exchange process of downsized turbocharged spark-ignition engines: A review

Akehurst

Brace

2015

International Journal of Engine Research

View full text Add to dashboard Cite

Engine downsizing, which is the use of a smaller engine that provides the power of a larger engine, is now considered a mega-trend for the internal combustion engine market. It is usually achieved using one or more boosting devices including a supercharger or a turbocharger. Although supercharging is beneficial for engine's transient response, turbocharging technology is more widely adopted considering its advantages in fuel efficiency. Compared to turbocharged compression ignition engines, turbocharged spark-ignition engines tend to be more challenging with respect to the gas exchange process mainly due to their higher pumping loss, the need for throttling and the fact that spark-ignition engines demand more controllability due to the mitigation of knock, particularly with regard to minimizing trapped residuals. These challenges encourage the entire gas exchange process of turbocharged spark-ignition engines to be regarded as a complete air management system instead of just looking at the boosting system in isolation. In addition, more research emphasis should be focused on novel approaches to improve the gas exchange process of downsized turbocharged spark-ignition engines because the refinement of the conventional technologies cannot provide continuous gains indefinitely and only innovative concept may improve the engine performance to meet the fuel efficiency target and the more stringent emission regulation in the future. This article will first briefly review knowledge of the current state of the art technologies that are in production as opposed to approaches that are currently only being investigated at a research level. Next, more novel methods of the gas exchange process are introduced to identify the improved synergies between the engine and the boosting machine. The major findings to improve the gas exchange process that emerge from this review comprise four aspects (depending on the location where the novel technologies are implemented) which are as follows: charge air pressurization/de-pressurization improvement, combustion efficiency enhancement within the chamber, valve event-associated development and exhaust system optimization. Although the interaction between these technologies on different aspects of the gas exchange process was found to be highly complex, the optimization or the combination of these technologies is anticipated to further improve a downsized turbocharged spark-ignition engine's performance.

show abstract

An automotive engine charge-air intake conditioner system: Thermodynamic analysis of performance characteristics

Cited by 10 publications

References 3 publications

Observations on and potential trends for mechanically supercharging a downsized passenger car engine:a review

Observations on and potential trends for mechanically supercharging a downsized passenger car engine:a review

Advances in Integrated Vehicle Thermal Management and Numerical Simulation

Novel approaches to improve the gas exchange process of downsized turbocharged spark-ignition engines: A review

Contact Info

Product

Resources

About