NDLI: Air motor for improved engine brake efficiency Design and preliminary experiments

Content Provider	IEEE Xplore Digital Library
Author	Malpress, R. Buttsworth, D.R.
Copyright Year	2009
Description	Author affiliation: Faculty of Engineering and Surveying, University of Southern Queensland, Toowoomba, Australia (Malpress, R.; Buttsworth, D.R.)
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.
Starting Page	128
Ending Page	135
File Size	812632
Page Count	8
File Format	PDF
ISBN	9781424451449
DOI	10.1109/ICEENVIRON.2009.5398658
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-12-07
Publisher Place	Malaysia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Induction motors Induction generators Air motor Manifolds Couplings Friction Internal combustion engines Prototypes Throttling losses Induction air motor Internal combustion engine Engine efficiency Heat transfer Engine cylinders Testing
Content Type	Text
Resource Type	Article

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