The influence of blow-by on indicated work output from a diesel engine under cold start conditions

The start-up time of automotive, light-duty diesel engines increases as ambient temperature falls. One contributory cause is a reduction in indicated work output. The influence of blow-by in bringing about the reduction has been investigated. The experimental study was carried out at 20° C on four-c...

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Published in:Proceedings of the Institution of Mechanical Engineers. Part D, Journal of automobile engineering Journal of automobile engineering, 2004-03, Vol.218 (3), p.333-340
Main Authors: Cheng, K Y, Shayler, P J, Murphy, M
Format: Article
Language:English
Subjects:
Applied sciences
Automobiles
Cold
Diesel engines
Exact sciences and technology
Mechanical engineering
Mechanical engineering. Machine design
Pressure
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creator Cheng, K Y
Shayler, P J
Murphy, M
description The start-up time of automotive, light-duty diesel engines increases as ambient temperature falls. One contributory cause is a reduction in indicated work output. The influence of blow-by in bringing about the reduction has been investigated. The experimental study was carried out at 20° C on four-cylinder direct injection (DI) engines with a capacity of around 2 l. Blow-by losses were inferred from measurements of gas flow from the crankcase. Indicated mean effective pressure was shown to decrease linearly with increasing blow-by rate. The relationship accounts for almost all the reduction in work output at low temperatures. The reduction is associated with the influence of blow-by on heat released during combustion, rather than with the transport of enthalpy from the cylinder.
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source SAGE; IMechE Titles Via Sage
subjects Applied sciences
Automobiles
Cold
Diesel engines
Exact sciences and technology
Mechanical engineering
Mechanical engineering. Machine design
Pressure
title The influence of blow-by on indicated work output from a diesel engine under cold start conditions
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