Theoretical and experimental studies of air-hybrid engine operation with fully variable valve actuation

Zhao, Hua; Psanis, C.; Ma, Tom; Turner, J. W. G.; Pearson, Richard

doi:10.1177/1468087411422846

Cited by 7 publications

(7 citation statements)

References 13 publications

(17 reference statements)

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“…As part of the initial investigation on performance and potential of the air hybrid engine, experimental studies were carried out in a single-cylinder research engine with the Lotus’ fully variable valve actuation (FVVA) system in the authors’ laboratory. 1,2 The experimental study and the engine modelling results demonstrated the capability of the FVVA system to enable air hybrid operation for internal combustion engines. It was shown that the two-stroke compressor mode and expander mode operations were the most effective air hybrid operations and could be readily achieved with the FVVA system together with a dedicated compressed air transfer passage in the cylinder head.…”

Section: Introductionmentioning

confidence: 90%

“…As part of the initial investigation on performance and potential of the air hybrid engine, experimental studies were carried out in a single cylinder research engine with the Lotus' fully variable valve actuation system (FVVA) in the authors laboratory [1][2]. The experimental study as well as the engine modelling results demonstrated the capability of the FVVA system to enable air-hybrid operation for internal combustion engines.…”

Section: Introductionmentioning

confidence: 99%

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Experimental studies of the air hybrid engine charging operation

Zhao

Lee

2014

International Journal of Engine Research

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Experimental studies of the air hybrid engine charging operation

Zhao

Lee

2014

International Journal of Engine Research

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“…The fuel saving was up to 35%, compared with that of a naturally aspirated spark ignition engine with the same rated power. Zhao et al 17 and Turner et al 18 have also conducted pneumatic hybrid research by adopting electrohydraulic valve systems on all valves.…”

Section: Introductionmentioning

confidence: 99%

Research on a pneumatic hybrid engine with regenerative braking and compressed-air-assisted cranking

Wang

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part D:

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With the aim of improving the energy efficiency of conventional vehicles, this paper proposes a pneumatic hybrid engine concept, which features regenerative braking and compressed-air-assisted cranking functions. In the regenerative braking mode, the engine works as a two-stroke compressor and converts the kinematic energy of the vehicle into compressed air. In the two-stroke air motor mode, a throttle valve in the intake manifold is used to block the ambient air, and an electropneumatic solenoid valve is employed to control the compressed-air injection. The compressor mode is modelled on the basis of thermodynamics and gas dynamics theories and is improved according to the bench test results of a single-cylinder engine converted from a two-cylinder diesel engine. Transient engine cranking tests are also conducted and are discussed. Urban driving-cycle simulation results show that the fuel consumption of a light-duty vehicle with a pneumatic hybrid system can be reduced by 8%.

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“…Psanis 13 and Zhao et al 14 have also tested the full air hybrid operation on a single cylinder research engine with a Lotus fully variable valve actuation system (FVVA). 13,14 According to the modelling and experimental results, two-stroke compressor mode (CM) and expander mode operations can achieve most effective air hybrid operations.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a novel mild air hybrid engine technology, RegenEBD, for buses and commercial vehicles

Lee

Zhao

2012

International Journal of Engine Research

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In this paper, a novel cost-effective mild air hybrid engine concept for buses and commercial vehicles, RegenEBD, is presented. This air hybrid technology is designed to convert kinetic energy into pneumatic energy of the compressed air stored in the air tank normally installed on such vehicles. The compressed air can then be used to drive an air starter to achieve regenerative stop–start operations for buses and delivery vehicles with frequent stop–start operations. For other commercial vehicles, it can provide service air required for braking and pneumatic operations and reduce the usage of the engine driven compressor. Furthermore, the availability of the free compressed air can be used to provide instant boost to a turbocharged engine at start-up and during acceleration for better performance and improved fuel economy. A six-cylinder diesel engine has been modelled to operate as a mild air hybrid engine and analysed using an engine simulation programme. In addition, a newly developed air hybrid vehicle driving cycle simulation programme has been applied to analyse the charging and discharging processes during a typical London Bus route and a German Braunschweig city cycle. The analysis shows that with the RegenEBD, almost all the idling periods can be eliminated through regenerative stop–start operations, resulting in a fuel saving of 6.5–7.2%.

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Theoretical and experimental studies of air-hybrid engine operation with fully variable valve actuation

Cited by 7 publications

References 13 publications

Experimental studies of the air hybrid engine charging operation

Experimental studies of the air hybrid engine charging operation

Research on a pneumatic hybrid engine with regenerative braking and compressed-air-assisted cranking

Analysis of a novel mild air hybrid engine technology, RegenEBD, for buses and commercial vehicles

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