Audi V8TDI-4,0L-Engine · 10/16/2016 · Audi V8TDI, GT Conference 2016, AUDI AG, Torsten Rausch 1...
Transcript of Audi V8TDI-4,0L-Engine · 10/16/2016 · Audi V8TDI, GT Conference 2016, AUDI AG, Torsten Rausch 1...
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Development supported by GT-Power
GT Conference 2016
AUDI AG Torsten Rausch
Audi V8TDI-4,0L-Engine
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2 Simulation Work Overview – GT-Power
3 Simulation Concept Phase
1 Basic Engine Data
4 Simulation Predevelopment Phase
5 Simulation Series Development Phase
AGENDA
6 Conclusion
Audi V8TDI, GT Conference 2016, AUDI AG, Torsten Rausch
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Audi Q7 V8 TDI Current Generation
Audi SQ7 V8 TDI New Generation
Audi new V8TDI-4,0L-Engine
Basic Engine Data
Transmission 8-gear tiptronic quattro 8-gear tiptronic quattro
EU-Emission Class EU5 EU6
CO2 Emission [g/km] 242 189
Max. Torque [Nm] 800 900
Max. Power [kW] 250 320
Acceleration 0-100 km/h [s] 6,5 4,8
Max. Speed [km/h] 243 250 speed-limitation
Fuel Consumption [l/100 km] 9,2 7,2
Audi V8TDI, GT Conference 2016, AUDI AG, Torsten Rausch
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Audi new V8TDI-4,0L-Engine
Basic Engine Data
Po
we
r[k
W]
Speed [rpm]
0 1000 2000 3000 4000 5000
900
750
600
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To
rqu
e[N
m]
0
280
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Audi V8TDI, GT Conference 2016, AUDI AG, Torsten Rausch
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Audi new V8TDI-4,0L-Engine
Simulation Work Overview – GT-Power D
ev
elo
pm
en
t W
ork
100 %
1D-Simulation
Hardware /
Testbench
Time
Concept Phase Predevelopment Series Development
0 %
Task force i+1
Task force i
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› Systems
- EGR (1D/3D)
- Cyl. Head Orientation
- Air Path Pulsation
› Charger Concepts
- Two Stage Charging
- Sequential Turbocharging
› Prediction
- Torque, Power
- Swirl
- Cyl. specific spread in charge
› Geometry
- Volumes
- Length / Diameters
- Geometry of the Recirculation Pipe
Audi new V8TDI-4,0L-Engine
Simulation Concept Phase
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Ca Cp
EG
R
Air Path
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Geometery of the Recirculation Pipe
› Determine the optimal diameter
› Diameter is a function of the passive
compressor
› Too small diameter generates surge
› Influence of pressure losses along
recirculation pipe
› Simulation Result: Optimal Diameter
This information is passed along to the
design department.
Audi new V8TDI-4,0L-Engine
Simulation Concept Phase
Audi V8TDI, GT Conference 2016, AUDI AG, Torsten Rausch
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› Sizing of the Turbo Charger
- Size
- Symmetric layout
- Asymmetric layout
› Gas exchange
- Valve Timings / Events
- Inlet-/outlet-manifold
› Sensitivity studies
- back pressure level
- boost pressure
- pressure loss in the exhaust system
Audi new V8TDI-4,0L-Engine
Simulation Predevelopment Phase
Audi V8TDI, GT Conference 2016, AUDI AG, Torsten Rausch
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› There are two ranges in the
simulation
- back pressure below max. value
- back pressure at the max. value
Audi new V8TDI-4,0L-Engine
Simulation Predevelopment Phase
› Simulation Results
Simple way to estimate effects of
pressure losses along the exhaust system.
Audi V8TDI, GT Conference 2016, AUDI AG, Torsten Rausch
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› Sizing
- fine tuning
(e. g. turbo charger, recirculation pipe, …)
- update GT-model
› „Task forces“
- support in general analysis
› Engine application
- transient simulation
- Switch from single turbo to
biturbo mode during transients
Audi new V8TDI-4,0L-Engine
Simulation Series Development
Audi V8TDI, GT Conference 2016, AUDI AG, Torsten Rausch
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› Cylinder Head
› Audi AVS System
Audi new V8TDI-4,0L-Engine
Simulation Series Development
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› Turbo System Sketch
› Single Turbo Mode
Audi new V8TDI-4,0L-Engine
Simulation Series Development
Audi V8TDI, GT Conference 2016, AUDI AG, Torsten Rausch
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› Turbo System Sketch
› Biturbo Mode
Audi new V8TDI-4,0L-Engine
Simulation Series Development
Audi V8TDI, GT Conference 2016, AUDI AG, Torsten Rausch
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› Problem
- noise during shift process
between monoturbo mode to
biturbo mode
› Transient GT-model
- optimizing shift strategy
Audi new V8TDI-4,0L-Engine
Simulation Series Development
Audi V8TDI, GT Conference 2016, AUDI AG, Torsten Rausch
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Ca Cp
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› Results
- Phase 1:
4 cylinders shift first
recirculation valve is fully opened
Audi new V8TDI-4,0L-Engine
Simulation Series Development
Phase 1
Phase 2
- Phase 2:
other 4 cylinders shift
recirculation valve closes quickly
Audi V8TDI, GT Conference 2016, AUDI AG, Torsten Rausch
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Audi new V8TDI-4,0L-Engine
Simulation Work Overview – Conclusion D
ev
elo
pm
en
t W
ork
100 %
1D-Simulation
Hardware /
Testbench
Time
Concept Phase Predevelopment Series Development
0 %
Task force i+1
Task force i
Audi V8TDI, GT Conference 2016, AUDI AG, Torsten Rausch
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Thank you!
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Torsten Rausch
AUDI AG
N/EA-723 Simulation Powertrain
NSU-Straße 1
74172 Neckarsulm
Germany
Lync +497132-31-86143
E-Mail [email protected]