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![Page 1: BEV POWERTRAIN MODEL VALIDATION - gtisoft.com · IMPACT AGENDA BEV POWERTRAIN MODEL VALIDATION. Bosch Engineering North America | BEG/EPT3-NA | 11/03/2017 ... Driver Model Auxiliary](https://reader035.vdocuments.net/reader035/viewer/2022070920/5fb96887917d580dbc223a20/html5/thumbnails/1.jpg)
BEV POWERTRAIN MODEL VALIDATION
![Page 2: BEV POWERTRAIN MODEL VALIDATION - gtisoft.com · IMPACT AGENDA BEV POWERTRAIN MODEL VALIDATION. Bosch Engineering North America | BEG/EPT3-NA | 11/03/2017 ... Driver Model Auxiliary](https://reader035.vdocuments.net/reader035/viewer/2022070920/5fb96887917d580dbc223a20/html5/thumbnails/2.jpg)
OBJECTIVEVEHICLE CHARACTERISATIONMODEL DECOMPOSITIONINSTRUMENTATION SETUPTEST PLANCOMPONENT CHARACTERISATIONRESULTSDISCUSSIONSIMPACT
AGENDABEV POWERTRAIN MODEL VALIDATION
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Bosch Engineering North America | BEG/EPT3-NA | 11/03/2017© 2017 Robert Bosch LLC and affiliates. All rights reserved.
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Systems level validation of a Bosch physics based model
Quantization of accuracy of topology studies for customers
OBJECTIVEBEV POWERTRAIN MODEL VALIDATION
24 kWh
Li-ion
Battery
Power Inverter Module83 kW 3-phase
AC Motor with
Single speed drive
Regenerative Brake Module
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Bosch Engineering North America | BEG/EPT3-NA | 11/03/2017© 2017 Robert Bosch LLC and affiliates. All rights reserved.
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Brake controller
Vehicle Controller
Energy Storage SystemPower Electronics
Model
Transmission Model
Vehicle Model
Driver Model
Auxiliary Power Consumption
VEHICLE MODEL CHARACTERISATIONBEV POWERTRAIN MODEL VALIDATION
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Target Creep Speed
Maximum deceleration due to
Regeneration Regeneration Limits
Power-electronics Losses
Accelerator Pedal map
Rolling Resistance
Bosch Engineering North America | BEG/EPT3-NA | 11/03/2017© 2017 Robert Bosch LLC and affiliates. All rights reserved.
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Battery OCV & Impedance
Battery Current and Power
LimitsMotor Speed and Torque Limits
FD Ratio
CdFrontal AreaTrack
Wheel-base
Auxiliary Power
CoG Height Powertrain
Efficiency
Vehicle mass
Minimum Speed for Regenerative Braking
Brake Blending Velocity
Brake Blending Ratio
MODEL DECOMPOSITIONBEV POWERTRAIN MODEL VALIDATION
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Bosch Engineering North America | BEG/EPT3-NA | 11/03/2017© 2017 Robert Bosch LLC and affiliates. All rights reserved.
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INSTRUMENTATION SETUPBEV POWERTRAIN MODEL VALIDATION
![Page 7: BEV POWERTRAIN MODEL VALIDATION - gtisoft.com · IMPACT AGENDA BEV POWERTRAIN MODEL VALIDATION. Bosch Engineering North America | BEG/EPT3-NA | 11/03/2017 ... Driver Model Auxiliary](https://reader035.vdocuments.net/reader035/viewer/2022070920/5fb96887917d580dbc223a20/html5/thumbnails/7.jpg)
Bosch Engineering North America | BEG/EPT3-NA | 11/03/2017© 2017 Robert Bosch LLC and affiliates. All rights reserved.
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TEST PLANBEV POWERTRAIN MODEL VALIDATION
ON-ROAD DYNAMOMETER
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Bosch Engineering North America | BEG/EPT3-NA | 11/03/2017© 2017 Robert Bosch LLC and affiliates. All rights reserved.
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BRAKE CONTROLLER Lower threshold for regenerative brake blend out
Regenerative Torque ramp-out rate
Start of blend velocity
Threshold deceleration for regenerative braking
Critical Brake Torque Demand
Regenerative Brake Torque Capacity
BEV POWERTRAIN MODEL VALIDATIONVehicle Speed (kmph)
Start of blend velocity Lower threshold velocity for brake blending
Torqu
e (Nm
)
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Bosch Engineering North America | BEG/EPT3-NA | 11/03/2017© 2017 Robert Bosch LLC and affiliates. All rights reserved.
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BATTERY PACK
Impedance
Using equation,
Vt = Vo - IR
where,Vt = Terminal VoltageVo = Open Circuit VoltageI = CurrentR = Internal Resistance
BATTERY PACKBEV POWERTRAIN MODEL VALIDATION
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Bosch Engineering North America | BEG/EPT3-NA | 11/03/2017© 2017 Robert Bosch LLC and affiliates. All rights reserved.
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VEHICLE CONTROLLER
Creep Velocity
Pedal Mapping
Torque Request Computation
BEV POWERTRAIN MODEL VALIDATION
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Bosch Engineering North America | BEG/EPT3-NA | 11/03/2017© 2017 Robert Bosch LLC and affiliates. All rights reserved.
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Model validation was done over 5 standard drive cycles
Performance metrics analysed:
‒ Energy Consumption (Joules)
‒ Range (km)
RESULTSBEV POWERTRAIN MODEL VALIDATION
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Bosch Engineering North America | BEG/EPT3-NA | 11/03/2017© 2017 Robert Bosch LLC and affiliates. All rights reserved.
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RESULTSBEV POWERTRAIN MODEL VALIDATION
MOTOR POWER
Time (sec)
Powe
r (kW
)
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Bosch Engineering North America | BEG/EPT3-NA | 11/03/2017© 2017 Robert Bosch LLC and affiliates. All rights reserved.
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68.367.0 67.8 67.2
65.1
70.271.4 71.5 71.1 71.9
2.7
6.25.1 5.4
9.5
0.0
5.0
10.0
15.0
20.0
25.0
30.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
75.0
US06 HWFET WLTC NEDC UDDS
Inaccu
racy (
%)
Energ
y (MJ
)
ENERGY CONSUMPTION
Model Actual Inaccuracy
RESULTSBEV POWERTRAIN MODEL VALIDATION
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Bosch Engineering North America | BEG/EPT3-NA | 11/03/2017© 2017 Robert Bosch LLC and affiliates. All rights reserved.
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114.9
163.6155.2
172.5
201.9
109.3
155.2 152.2161.1
182.7
5.2 5.4
2.0
7.1
10.5
0.0
5.0
10.0
15.0
20.0
25.0
30.0
30.0
50.0
70.0
90.0
110.0
130.0
150.0
170.0
190.0
210.0
230.0
US06 HWFET WLTC NEDC UDDS
Inaccu
racy (
%)
Dista
nce (k
m)
RANGE ESTIMATION
Model Actual Inaccuracy
RESULTSBEV POWERTRAIN MODEL VALIDATION
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Bosch Engineering North America | BEG/EPT3-NA | 11/03/2017© 2017 Robert Bosch LLC and affiliates. All rights reserved.
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Systems approach to calibration
Reduced development time by eight to twelve months
Number of prototypes reduced by two - three
Significant cost savings per vehicle program
DISCUSSIONS AND IMPACTBEV POWERTRAIN MODEL VALIDATION
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Bosch Engineering North America | BEG/EPT3-NA | 11/03/2017© 2017 Robert Bosch LLC and affiliates. All rights reserved.
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THANK YOU