Transcript Encapsulation of engine bay for active thermal control and lower

Encapsulation of engine bay for active
thermal control and lower noise emissions
Start: 09. 2013
End: 09.2016
Fordonsstrategisk Forskning och Innovation
6842 kkr
1
2014-08-26
Blago Minovski
Supervisor: Prof. Lennart Löfdahl
Department of Applied Mechanics
Division of Vehicle Engineering and Autonomous Systems
Background
 Higher requirements for
energy-efficient and quiet
vehicles.
 Demands for shorter lead
times implicate the design
process in a way that noise
levels, coolant and cooling air
flows, etc. must be decided
already at concept stage.
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Concept
 Engine encapsulation retains
heat in the powertrain
 Increases probability of high
initial oil temperature at next
engine start
 Reduces air-bourne noise
 Optimized engine cooling and
vehicle thermal management by
implementation of active means
of temperature and flow control
in the engine bay.
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Aim
 To develop a method and a
software toolbox for evaluation
of engine encapsulation
effectiveness
– Cooling system temperatures
for continuous drive cycles
– Hot spots (caused by
radiation)
– Prediction of noise emissions
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Current Status
Developed and validated a detailed 1-D model of the cooling system
coupled with engine model that predicts important cooling system
parameters with continuous signal input.
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Current work
Implementation of three-dimentional tools to increase the accuracy of
simulation and prediction
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Future work

Extend the 1-D model to simulate the engine oil temperature variation
after shutdown
 Thermal models of encapsulation structures
 Propose an engine encapsulation concept with active control and
analyze it with the developed tool
 Work out radiation and acoustic models and correlate simulation results
to test results for the selected concept
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Publications
 "Study of Software Integration for Transient Simulation of Future Cooling
System for Heavy Truck Application," SAE Technical Paper 2014-010653, 2014, doi:10.4271/2014-01-0653.

“An improved method for transient simulations of cooling systems with
non-uniform thermal and flow boundaries” SAE Technical Paper
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