Air motor for improved engine brake efficiency: design and preliminary experiments
Paper
Paper/Presentation Title | Air motor for improved engine brake efficiency: design and preliminary experiments |
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Presentation Type | Paper |
Authors | Malpress, R. (Author) and Buttsworth, D. R. (Author) |
Editors | Abidin, Izham Bin Datuk Zainal |
Journal or Proceedings Title | Proceedings of the 3rd International Conference on Energy and Environment (ICEE 2009) |
ERA Conference ID | 50682 |
Number of Pages | 8 |
Year | 2009 |
Place of Publication | Malaysia |
ISBN | 9781424451449 |
9781424451456 | |
Digital Object Identifier (DOI) | https://doi.org/10.1109/ICEENVIRON.2009.5398658 |
Web Address (URL) of Paper | https://ieeexplore.ieee.org/document/5398658 |
Conference/Event | 3rd International Conference on Energy and Environment (ICEE 2009): Advancement Towards Global Sustainability |
International Conference on Energy & Environment | |
Event Details | 3rd International Conference on Energy and Environment (ICEE 2009): Advancement Towards Global Sustainability Event Date 07 to end of 08 Dec 2009 Event Location Malacca, Malaysia |
Event Details | International Conference on Energy & Environment EE |
Abstract | The brake efficiency of a throttled internal combustion engine is reduced at low load operation because of the engine work required to drop the intake manifold pressure. These throttling losses are experienced by all throttled engines operating at less than wide open throttle (WOT). By replacing the throttle plate with a suitable air motor, work can be recovered in an expansion process that reduces the induced air pressure to the same intake manifold pressure as the throttled engine. To maximize the benefits from coupling the air motor to the engine cycle, the air should be returned to a thermal state identical to that of the throttled case at some point prior to combustion. This might be achieved either: (i) prior to cylinder compression via regenerative heat transfer to the inducted air; or (ii) through cylinder compression at an increased compression ratio. The work generated by the Induction Air Motor (IAM) can be directly applied to the engine output thereby increasing the brake efficiency for the same indicated work. This paper reports on the performance of an IAM designed to reduce intake pressure of an engine for low load operation. Increased brake efficiency will be achieved. The IAM design specifications are explored using a numerical model including isentropic efficiency, friction and service life considerations. A prototype has been constructed and was bench tested at flows and pressures comparable to a throttled engine. These tests indicated that the modelled friction was lower than the friction measured during the experiments. From the experiments performed with the prototype, the net performance of an IAM will give efficiency improvements in excess of 5% for an equivalent throttled engine operating at loads in the range up to 10% of its WOT power. |
Keywords | internal combustion engine; throttling losses; air motor; engine efficiency; induction air motor |
ANZSRC Field of Research 2020 | 400203. Automotive mechatronics and autonomous systems |
400204. Automotive safety engineering | |
401706. Numerical modelling and mechanical characterisation | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Computational Engineering and Science Research Centre |
https://research.usq.edu.au/item/9z6w3/air-motor-for-improved-engine-brake-efficiency-design-and-preliminary-experiments
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