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Title: Fault
diagnostics in power electronics-based brake-by-wire systems
Author(s): M A Masrur, H-J Wu, C Mi, Z-H Chen, Y L Murphey
Source: Proceedings of the I MECH E Part D Journal of
Automobile Engineering
Volume: 222 Page: 1-11. Jan 2008
DOI: 10.1243/09544070JAUTO385
Publisher: Professional Engineering Publishing
Abstract: A d.c.-motor-based brake-by-wire system is studied
for the purpose of fault diagnostics of the power electronic switches.
The voltage and current generated in the switching circuit under normal
and six faulted conditions are observed. A hierarchical fuzzy diagnostic
system has been developed to detect certain types of fault condition in
any specific solid state power switch at the moment immediately after
the occurrence of the fault. The hierarchical fuzzy diagnostic system
has been tested and validated using data from both a simulation and a
laboratory set-up with a 1 / 3 hp d.c. motor and a d.c.-to-d.c. converter.
The system performance has been compared with two different fuzzy diagnostic
systems and the results are presented. The hierarchical fuzzy diagnostic
system trained on the simulated model has the capability of detecting
certain types of fault condition occurring in a brake-by-wire actuator
system set-up in a laboratory in less than 0.0009 s and pinpointing the
specific types of fault within less than 0.013 s.
Title: Electronic
control units for automotive electrical power systems: communication and
networks
Author(s): A Shrinath; A Emadi
Source: Proceedings of the I MECH E Part D Journal of Automobile
Engineering
Volume: 218 Page: 1217 - 1230. Nov 2004
DOI: 10.1243/0954407042579996
Publisher: Professional Engineering Publishing
Abstract: The last decade has seen a resurgence of advanced technologies
being implemented in automobiles. Functions that were considered highly
complex and difficult to be implemented are not only being provided but
various other facilities are also being built on those very functions.
Everything from engine control to multimedia and infotainment services
are implemented in today's automobiles. This has been due largely to the
strides made by the electronics as well as the communications industry.
The emergence of the concept of providing the customer with all possible
services has led to an explosion of implementation of high-end electronics,
each providing a facility of its own. When so many devices are being embedded
in a car, there also has to be a mechanism that should regulate the way
in which data transfer takes place. It is the objective of this paper
to provide an insight into most of the communication protocols that are
being used, as well as technologies that are under development in the
automobile industry of today. Various protocols and their modus operandi
are explained, with schematics completing the picture.
Title: A
study on an electronically controlled liquefied petroleum gas-diesel dual-fuel
automobile
Author(s): Chunhua Zhang; Yaozhang Bian; Lizeng Si; Junzhi Liao;
N Odbileg
Source: Proceedings of the I MECH E Part D Journal of Automobile
Engineering
Volume: 219 Page: 207 - 213. Aug 2004
DOI: 10.1243/095440705X6470
Publisher: Professional Engineering Publishing
Abstract: In this paper, the control scheme of a liquefied petroleum
gas (LPG)-diesel dual-fuel engine with electronic control is illustrated,
the external characteristics and load characteristics of the LPG-diesel
dual-fuel engine and the diesel engine are compared and analysed, and
the results of automobile road tests are also given. The experimental
results show that, compared with diesel, the output performance of dual
fuel is not reduced, while smoke emission of dual fuel is significantly
reduced, NOx emission of dual fuel is hardly changed, but HC emission
and CO emission of dual fuel are increased and fuel consumption of dual
fuel is reduced.
Title: The
impact of adaptive cruise control systems on highway safety and traffic
flow
Author(s): J Wang; R Rajamani
Source: Proceedings of the I MECH E Part D Journal of Automobile
Engineering
Volume: 218 Page: 111 - 130. Feb 2004
DOI: 10.1243/095440704772913918
Publisher: Professional Engineering Publishing
Abstract: This paper deals with the design of new adaptive cruise
control (ACC) systems that can improve traffic flow while at the same
time ensuring safe operation on today's highways. ACC systems are commonly
designed to maintain a constant time-gap (CTG) between vehicles during
vehiclefollowing. In this paper, a new inter-vehicle spacing policy in
which the inter-vehicle spacing is a non-linear function of vehicle speed
is developed. The new spacing policy, referred to as a variable time-gap
(VTG) policy, is shown analytically to lead to better traffic flow and
a higher highway capacity. Practical advantages of using the new spacing
policy are demonstrated through traffic simulations. However, a detailed
analysis of safety shows that the traditional CTG policy is superior in
several scenarios. The VTG policy is then modified by explicitly taking
inter-vehicle relative velocity into account in the definition of desired
spacing. The resulting new spacing policy is shown to retain the advantages
of stable traffic flow and a higher capacity while providing the same
level of safety as the CTG policy.
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