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The Effect of Intake Temperature in a Turbocharged Multi Cylinder Engine operating in HCCI mode

Johansson, Thomas LU ; Johansson, Bengt LU ; Tunestål, Per LU and Aulin, Hans LU (2009) ICE2009: 9th International Conference on Engines and vehicles In ICE 2009 p.1-15
Abstract
The operating range in HCCI mode is limited by the excessive pressure rise rate and therefore high combustion induced noise. The HCCI range can be extended with turbocharging which enables increased dilution of the charge and thus a reduction of combustion noise. When the engine is turbocharged the intake charge will have a high temperature at increased boost pressure and can then be regulated in a cooling circuit. Limitations and benefits are examed at 2250 rpm and 400 kPa indicated mean effective pressure. It is shown that combustion stability, combustion noise and engine efficiency have to be balanced since they have optimums at different intake temperatures and combustion timings. The span for combustion timings with high combustion... (More)
The operating range in HCCI mode is limited by the excessive pressure rise rate and therefore high combustion induced noise. The HCCI range can be extended with turbocharging which enables increased dilution of the charge and thus a reduction of combustion noise. When the engine is turbocharged the intake charge will have a high temperature at increased boost pressure and can then be regulated in a cooling circuit. Limitations and benefits are examed at 2250 rpm and 400 kPa indicated mean effective pressure. It is shown that combustion stability, combustion noise and engine efficiency have to be balanced since they have optimums at different intake temperatures and combustion timings. The span for combustion timings with high combustion stability is narrower at some intake temperatures and the usage of external EGR can improve the combustion stability. It is found that the standard deviation of combustion timing is a useful tool for evaluating cycle to cycle variations. One of the benefits with HCCI is the low pumping losses, but when load and boost pressure is increased there is an increase in pumping losses when using negative valve overlap. The pumping losses can then be circumvented to some extent with a low intake temperature or EGR, leading to more beneficial valve timings at high load. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Turbo, Direct injection, HCCI
in
ICE 2009
pages
15 pages
publisher
SAE
conference name
ICE2009: 9th International Conference on Engines and vehicles
language
English
LU publication?
yes
id
7270ef41-a6dc-479e-82ca-d80747d10bd2 (old id 1496884)
date added to LUP
2009-10-30 08:56:58
date last changed
2016-04-16 10:09:55
@inproceedings{7270ef41-a6dc-479e-82ca-d80747d10bd2,
  abstract     = {The operating range in HCCI mode is limited by the excessive pressure rise rate and therefore high combustion induced noise. The HCCI range can be extended with turbocharging which enables increased dilution of the charge and thus a reduction of combustion noise. When the engine is turbocharged the intake charge will have a high temperature at increased boost pressure and can then be regulated in a cooling circuit. Limitations and benefits are examed at 2250 rpm and 400 kPa indicated mean effective pressure. It is shown that combustion stability, combustion noise and engine efficiency have to be balanced since they have optimums at different intake temperatures and combustion timings. The span for combustion timings with high combustion stability is narrower at some intake temperatures and the usage of external EGR can improve the combustion stability. It is found that the standard deviation of combustion timing is a useful tool for evaluating cycle to cycle variations. One of the benefits with HCCI is the low pumping losses, but when load and boost pressure is increased there is an increase in pumping losses when using negative valve overlap. The pumping losses can then be circumvented to some extent with a low intake temperature or EGR, leading to more beneficial valve timings at high load.},
  author       = {Johansson, Thomas and Johansson, Bengt and Tunestål, Per and Aulin, Hans},
  booktitle    = {ICE 2009},
  keyword      = {Turbo,Direct injection,HCCI},
  language     = {eng},
  pages        = {1--15},
  publisher    = {SAE},
  title        = {The Effect of Intake Temperature in a Turbocharged Multi Cylinder Engine operating in HCCI mode},
  year         = {2009},
}