Operation strategy of a Dual Fuel HCCI Engine with VGT
(2007)- Abstract
- HCCI combustion is well known and much results regarding
its special properties have been published.
Publications comparing the performance of different
HCCI engines and comparing HCCI engines to conventional
engines have indicated special features of
HCCI engines regarding, among other things, emissions,
efficiency and special feedback-control requirements.
This paper attempts to contribute to the common
knowledge of HCCI engines by describing an operational
strategy suitable for a dual-fuel port-injected
Heavy Duty HCCI engine equipped with a variable geometry
turbo charger. Due to the special properties of
HCCI combustion a... (More) - HCCI combustion is well known and much results regarding
its special properties have been published.
Publications comparing the performance of different
HCCI engines and comparing HCCI engines to conventional
engines have indicated special features of
HCCI engines regarding, among other things, emissions,
efficiency and special feedback-control requirements.
This paper attempts to contribute to the common
knowledge of HCCI engines by describing an operational
strategy suitable for a dual-fuel port-injected
Heavy Duty HCCI engine equipped with a variable geometry
turbo charger. Due to the special properties of
HCCI combustion a specific operational strategy has
to be adopted for the engine operation parameters (in
this case combustion phasing and boost pressure).
The low exhaust temperature of HCCI engines limits
the benefits of turbo charging and causes pumping
losses which means that “the more the merrier” principle
does not apply to intake pressure for HCCI engines.
It is desirable not to use more boost pressure
than necessary to avoid excessively rapid combustion
and/or emissions of NOx. It is also desirable to select
a correct combustion phasing which, like the boost
pressure, has a large influence on engine efficiency.
The optimization problem that emerges between the
need for boost pressure to avoid noise and emissions
and, at the same time, avoiding an extensive decrease
of efficiency because of pumping losses is the
topic of this paper. The experiments were carried out
on a 12 liter Heavy Duty Diesel engine converted to
pure HCCI operation. Individually injected natural gas
and n-Heptane with a nominal injection ratio of 85%
natural gas and the rest n-Heptane (based on heating
value) was used as fuel. The engine was under feedback combustion control during the experiments. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/620917
- author
- Wilhelmsson, Carl LU ; Tunestål, Per LU and Johansson, Bengt LU
- organization
- publishing date
- 2007
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- natural gas, Operation strategy, HCCI
- host publication
- SAE Technical Papers
- issue
- 2007-01-1855
- publisher
- SAE
- external identifiers
-
- scopus:85072438729
- ISSN
- 0096-5170
- project
- Competence Centre for Combustion Processes
- language
- English
- LU publication?
- yes
- id
- 1819f060-1e88-40b5-8e16-b20a8de0277a (old id 620917)
- date added to LUP
- 2016-04-01 16:49:53
- date last changed
- 2022-03-15 03:16:57
@inproceedings{1819f060-1e88-40b5-8e16-b20a8de0277a,
abstract = {{HCCI combustion is well known and much results regarding<br/><br>
its special properties have been published.<br/><br>
Publications comparing the performance of different<br/><br>
HCCI engines and comparing HCCI engines to conventional<br/><br>
engines have indicated special features of<br/><br>
HCCI engines regarding, among other things, emissions,<br/><br>
efficiency and special feedback-control requirements.<br/><br>
This paper attempts to contribute to the common<br/><br>
knowledge of HCCI engines by describing an operational<br/><br>
strategy suitable for a dual-fuel port-injected<br/><br>
Heavy Duty HCCI engine equipped with a variable geometry<br/><br>
turbo charger. Due to the special properties of<br/><br>
HCCI combustion a specific operational strategy has<br/><br>
to be adopted for the engine operation parameters (in<br/><br>
this case combustion phasing and boost pressure).<br/><br>
The low exhaust temperature of HCCI engines limits<br/><br>
the benefits of turbo charging and causes pumping<br/><br>
losses which means that “the more the merrier” principle<br/><br>
does not apply to intake pressure for HCCI engines.<br/><br>
It is desirable not to use more boost pressure<br/><br>
than necessary to avoid excessively rapid combustion<br/><br>
and/or emissions of NOx. It is also desirable to select<br/><br>
a correct combustion phasing which, like the boost<br/><br>
pressure, has a large influence on engine efficiency.<br/><br>
The optimization problem that emerges between the<br/><br>
need for boost pressure to avoid noise and emissions<br/><br>
and, at the same time, avoiding an extensive decrease<br/><br>
of efficiency because of pumping losses is the<br/><br>
topic of this paper. The experiments were carried out<br/><br>
on a 12 liter Heavy Duty Diesel engine converted to<br/><br>
pure HCCI operation. Individually injected natural gas<br/><br>
and n-Heptane with a nominal injection ratio of 85%<br/><br>
natural gas and the rest n-Heptane (based on heating<br/><br>
value) was used as fuel. The engine was under feedback combustion control during the experiments.}},
author = {{Wilhelmsson, Carl and Tunestål, Per and Johansson, Bengt}},
booktitle = {{SAE Technical Papers}},
issn = {{0096-5170}},
keywords = {{natural gas; Operation strategy; HCCI}},
language = {{eng}},
number = {{2007-01-1855}},
publisher = {{SAE}},
title = {{Operation strategy of a Dual Fuel HCCI Engine with VGT}},
url = {{https://lup.lub.lu.se/search/files/4793368/1033460.pdf}},
year = {{2007}},
}