Development and use of a hybrid electric vehicle (HEV) model for interactive customer assessment of sound quality : innovation report
Poxon, John E. W. (2009) Development and use of a hybrid electric vehicle (HEV) model for interactive customer assessment of sound quality : innovation report. EngD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b2521790~S15
With the increasing adoption and usage of hybrid electric vehicle (HEV) technologies,
there is a growing recognition that attributes such as dynamics, driveability and
refinement can have an adverse affect on customer acceptance. There are a number of
new challenges associated with their refinement, in particular their sound quality.
These issues include: understanding customers’ perceptions of new sound sources,
such as electric motor/generators (M/G) and electronic switching devices; reduced
masking from the internal combustion engine (ICE); the effect that a more advanced
control strategy can have on vehicle-level sound (both internally and externally); and
the effect of new sound character on customer perception.
Given these new challenges for the sound quality of HEVs, the best approach
for learning about perceptions needed to be determined. Interactive noise, vibration
and harshness (NVH) simulation is well suited to further our understanding of these
issues. The process for developing models for interactive NVH simulation of
conventional vehicles is well established. However, research was necessary to both
enhance this process for the creation of HEV models and to create new assessment
methods. This report gives a brief overview of a project to deliver this.
The key stages were: classification of unique HEV operations; development of
a HEV NVH model; validation of the NVH model to determine its suitability for
interactive simulation; leading onto recommendations for the use of new HEV sound
quality models for assessment.
An interactive HEV model has been successfully created and used in a number
of newly created HEV sound quality evaluations. Three assessments were created and
carried out which addressed new HEV related refinement issues of varying ICE
masking, varying control strategy and the effect of added interior synthesized sound
on customer perception. Key findings included: preference for reduced internal
combustion engine (ICE) sound in the Toyota Prius and significant differences in
perception of the same HEV, over the same drive cycle with varying initial battery
state-of-charge (SoC). The process developed and carried out and learning achieved
has been documented as a selection of flowcharts and can be used by OEMs or sound
specialists as a means for improving HEV sound quality.
|Item Type:||Thesis or Dissertation (EngD)|
|Subjects:||T Technology > TL Motor vehicles. Aeronautics. Astronautics|
|Library of Congress Subject Headings (LCSH):||Hybrid electric vehicles -- Computer simulation, Automobile sounds|
|Official Date:||September 2009|
|Institution:||University of Warwick|
|Theses Department:||School of Engineering|
|Supervisor(s)/Advisor:||Jennings, Paul Anthony, 1964-|
|Sponsors:||Engineering and Physical Sciences Research Council (EPSRC)|
|Extent:||viii, 146 leaves : ill., charts|
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