|
|
|
| |
Title: Fault
detection in internal combustion engines using fuzzy logic
Author(s): M B Çelik, R Bayir
Source: Proceedings of the I MECH E Part D Journal
of Automobile Engineering
Volume: 221 Page: 579-587. May 2007
DOI: 10.1243/09544070JAUTO366
Publisher: Professional Engineering Publishing
Abstract: In this study, a complementary fuzzy-logic-based
fault diagnosis system was developed to diagnose the faults of an
internal combustion engine (ICE) and the system incorporated with
an engine test stand. The input variables of the fuzzy logic classifier
were acquired via a data acquisition card and RS-232 port. The rule
base of this system was developed by considering the theoretical
knowledge, the expert knowledge, and the experiment results. The
accuracy of the fuzzy logic classifier was tested by experimental
studies which were performed under different fault conditions. Using
the developed fault diagnosis system, ten general faults which were
observed in the internal combustion engine were successfully diagnosed
in real time. With these characteristics, the system could easily
be used for fault diagnosis in test laboratories and in service
workshops.
|
| |
Title: Definition
of correlations between automotive test environments through mechanical
fatigue damage approaches
Author(s): R Kouta, D Play
Source: Proceedings of the I MECH E Part D Journal
of Automobile Engineering
Volume: 220 Page: 1691-1709. December 2006
DOI: 10.1243/09544070JAUTO206
Publisher: Professional Engineering Publishing
Abstract: The aim of validating the global endurance
of a mechanical system is to make sure that it shows no signs of
failure during series of specific tests. The latter are carried
out in more severe environments than those to which the system is
subjected during normal use. The application described here concerns
ground vehicles, and the study proposes methods and tools for optimizing
and organizing tests. This optimization is based on correlations
between different existing test environments. Two main methods of
correlation are proposed and developed: correlation based on mechanical
loadings and correlation based on mechanical damage. These methods
respectively permit analysis of the mechanical loadings that a system
undergoes during tests and prediction of the consequences of these
loadings. Both analyses help to reduce the duration and number of
tests. The analysis of measured loadings appearing in a mechanical
system consists in knowing the statistical contents of load signals
according to various forms (global statistical distribution, local
statistical distribution, distribution of extreme values, dynamic
signal behaviour, Markov matrix). Analysis of the consequences of
loadings consists in building a spectrum of robustness, a spectrum
of mechanical damage by fatigue, and a matrix of mechanical damage.
Tools stemming from these analyses permit better evaluation of fatigue
life expectancy and better definition of trial environments for
endurance testing with an overall severity equivalent to that applied
during normal use of the system.
|
| |
Title: Use
of a small low-noise wind tunnel for determining the aeroacoustic
noise produced by components on a vehicle
Author(s): M J Kingan, J R Pearse, P D Hubbard
Source: Proceedings of the I MECH E Part D Journal
of Automobile Engineering
Volume: 220 Page: 1539-1545. November 2006
DOI: 10.1243/09544070JAUTO249
Publisher: Professional Engineering Publishing
Abstract: This paper describes an experimental
method used to determine the aeroacoustic noise produced by a ‘roof
rack’ placed on the roof of a vehicle. Testing was done on
a vehicle roof positioned at the outlet jet of a small low-noise
wind tunnel. A ‘simulated vehicle cabin’ was constructed
beneath the vehicle roof that had similar absorption characteristics
to an actual vehicle cabin. Sound pressure level measurements were
made within the simulated vehicle cabin. The sound pressure level
measurements were consistent with measurements made within the cabin
of an actual vehicle in a large anechoic wind tunnel. The method
could also be used to determine the in-cabin aeroacoustic noise
produced by other vehicle accessories.
|
| |
Title: Robust
Tracking of Vibration Profiles for the Exhaust Durability Test
Author(s): Hwa Soo Kim, Ho Sung Lee, Young Man
Cho, Han-Jun Kim
Source: Proceedings of the I MECH E Part D Journal
of Automobile Engineering
Volume: 220 Page: 579-593. May 2006
DOI: 10.1243/09544070D10604
Publisher: Professional Engineering Publishing
Abstract: This paper presents a robust controller
for the exhaust durability test that enables precise tracking of
the vibration profiles against parameter variations. First, the
dynamics between the hydraulic actuator input and the acceleration
on the exhaust pipe are unravelled via a nonparametric system identification
method to establish the baseline system behaviour. Next, the physics-based
modelling leads to a parametric model whose dynamics match those
of the nonparametric one under various conditions and, as a result,
provide a clue for the root causes of the parameter variations.
The structured uncertainties arising from the parameter variations
naturally call for a robust control design methodology based on
the µ-synthesis. The extensive validation tests show that
the proposed robust control system clearly delivers the desired
performance of tracking vibration profiles during the exhaust durability
test while overcoming parameter variations. |
| |
Title: Performance
test and simulation of a reciprocating engine for long endurance
miniature unmanned aerial vehicles
Author(s): Younggy Shin; Sung-Ho Chang; Sam-Ok
Koo
Source: Proceedings of the I MECH E Part D Journal
of Automobile Engineering
Volume: 219 Page: 573 - 581. April 2005
DOI: 10.1243/095440705X11013
Publisher: Professional Engineering Publishing
Abstract: Development of an engine with good fuel
economy is very important for successful implementation of long
endurance miniature UAVs (unmanned aerial vehicles). In the study,
a four-stroke glow-plug engine was modified to a gasoline-fuelled
spark ignition engine. Engine tests measuring performance and friction
losses were conducted to tune a simulation program for performance
prediction. It has been found that excessive friction losses are
caused by insufficient lubrication at high speeds. The simulation
program predicts that engine power and fuel economy become worse
with high altitude, due to an increasing portion of friction losses.
The simulation results suggest quantitative guidelines for further
development of a practical engine.
|
Title: Performance
and exhaust emissions test results from a liquid propane injected
engine with hydrogen enrichment
Author(s): Gyeung Ho Choi; Sung Bin Han
Source: Proceedings of the I MECH E Part D Journal
of Automobile Engineering
Volume: 218 Page: 1135 - 1140. October 2004
DOI: 10.1243/0954407042274967
Publisher: Professional Engineering Publishing
Abstract: This paper investigates the effect of
performance and exhaust emissions test results from a liquid propane
injected engine with hydrogen enrichment. In order to research this
topic, the test engine was run at 1400 rpm with a compression ratio
of eight. Relative air-fuel varied between 0.8 and 1.3. CO emissions
decreased with the addition of hydrogen, but the oxygen amount decreased
around the rich and stoichiometric air-fuel ratio as the hydrogen
supplement rate increased. CO2 emissions decreased with the increase
in the hydrogen supplement rate. Total hydrocarbon emissions decreased
as hydrogen was added in the rich and around stoichiometic air-fuel
ratio. NOx emissions were maximum at around ? = 1.2 and the addition
of 20 per cent hydrogen resulted in about a 20 per cent increase
in the amount of NOx emissions compared to that of pure LPG combustion.
Power and thermal efficiency increased with the decrease of the
hydrogen supplement rate.
|
Title: Development
and test of a motor vehicle event data recorder
Author(s): Wonhee Lee; Inhwan Han
Source: Proceedings of the I MECH E Part D Journal
of Automobile Engineering
Volume: 218 Page: 977 - 985. September 2004
DOI: 10.1243/0954407041856755
Publisher: Professional Engineering Publishing
Abstract: A type of event data recorder ( EDR)
has been developed that can detect a crash automatically, and also
record the motion of the vehicle and driver's actions during a predefined
time period before and after the accident. The EDR consists of crash
detection and vehicle motion sensors, a steering sensor, several
digital input ports for detecting the driver's actions, a non-volatile
memory device for recording and a microprocessor for controlling
the unit. For reliable detection of accidentrelated crashes, it
is important to understand the characteristics of the crash signal,
which are very different from those of normal driving. Therefore,
analytical considerations were taken in designing prefiltering circuits
and selecting the appropriate parameters for identifying a crash.
It is also necessary to select a proper combination of motion sensors
and to design proper prefiltering circuits in order adequately to
describe the motion of the vehicle. Analysis algorithms have been
developed and implemented in order reliably to detect a crash, simulate
precrash trajectories, and calculate velocity change, dV, and PDOF
for reconstruction analysis of crash accidents. The developed EDR
was installed on passenger cars and several types of tests were
conducted in order to validate the accuracy of the recorded data
and usefulness of the analysis tool for reconstruction.
|
|
 |
|
