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Operation strategy of a Dual Fuel HCCI Engine with VGT

Wilhelmsson, Carl LU ; Tunestål, Per LU and Johansson, Bengt LU (2007) In SAE Technical Papers
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:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
natural gas, Operation strategy, HCCI
in
SAE Technical Papers
issue
2007-01-1855
publisher
SAE
external identifiers
  • scopus:79959828928
ISSN
0096-5170
language
English
LU publication?
yes
id
1819f060-1e88-40b5-8e16-b20a8de0277a (old id 620917)
date added to LUP
2008-02-05 09:25:38
date last changed
2017-04-16 04:15:26
@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},
  keyword      = {natural gas,Operation strategy,HCCI},
  language     = {eng},
  number       = {2007-01-1855},
  publisher    = {SAE},
  title        = {Operation strategy of a Dual Fuel HCCI Engine with VGT},
  year         = {2007},
}