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AE-BE/EKE-Powernet | 4/7/2016 | © Robert Bosch GmbH 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as
well as in the event of applications for industrial property rights.
Automotive Electronics
Simulation of Fault Tolerant Power Supply
Networks for ADAS Vehicles with SaberRD
Saber Seminar, Detroit
1 AE-BE/EKE-Powernet | 4/7/2016 | © Robert Bosch GmbH 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as
well as in the event of applications for industrial property rights.
AE-BE/EKE-Powernet | 4/7/2016 | © Robert Bosch GmbH 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as
well as in the event of applications for industrial property rights.
Simulation of Fault Tolerant Power Supply Networks Saber Seminar, Detroit
Automotive Electronics
Authors
Marco BeckmannRobert Bosch GmbH, Leonberg, Germany
Automotive Electronics – Body Electronics
System and Architecture Engineering
System Engineering Power Supply Networks
Coordination Modeling & Simulation
Dr. Jürgen BarthlottRobert Bosch GmbH, Leonberg, Germany
Automotive Electronics – Body Electronics
System and Architecture Engineering
System Engineering Power Supply Networks
Team Manager
2 AE-BE/EKE-Powernet | 4/7/2016 | © Robert Bosch GmbH 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as
well as in the event of applications for industrial property rights.
Situation:
Alternator fails during running automated highway pilot
Question:
Can the vehicle get
automated to safe state?
Simulations:
Varying electric loads
Different dynamic loads
Analysis & result:
Voltage level falls below critical threshold
Functional degrading of safety-relevant consumers Scenario is not achievable if this fault happens
AE-BE/EKE-Powernet | 4/7/2016 | © Robert Bosch GmbH 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as
well as in the event of applications for industrial property rights.
Simulation of Fault Tolerant Power Supply Networks Saber Seminar, Detroit
Automotive Electronics
Fault Example: Alternator BreakdownGoal / Safe Stop Scenario:
Stop at emergency lane
3 AE-BE/EKE-Powernet | 4/7/2016 | © Robert Bosch GmbH 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as
well as in the event of applications for industrial property rights.
AE-BE/EKE-Powernet | 4/7/2016 | © Robert Bosch GmbH 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as
well as in the event of applications for industrial property rights.
Simulation of Fault Tolerant Power Supply Networks Saber Seminar, Detroit
Automotive Electronics
Scenario Variations
Load Sc.1 Sc.2 Sc.3 Sc.4
Low ok ok ok fail
High ok ok fail fail
Subnet 1:
Load Sc.1 Sc.2 Sc.3 Sc.4
Low ok ok ok fail
High ok ok ok fail
Subnet 2:
4 AE-BE/EKE-Powernet | 4/7/2016 | © Robert Bosch GmbH 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as
well as in the event of applications for industrial property rights.
AE-BE/EKE-Powernet | 4/7/2016 | © Robert Bosch GmbH 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as
well as in the event of applications for industrial property rights.
Simulation of Fault Tolerant Power Supply Networks Saber Seminar, Detroit
Automotive Electronics
Using SaberRD
Fault Tool:
Definition of single point faults
and multiple point faults
Experiment Report:
Review of the results
Export to Excel
Signal Analyzer:
Validation of
simulationsExperiment Analyzer:
Variation of premises
Variation of fault sets
Automated analysis of the signal waveforms
5 AE-BE/EKE-Powernet | 4/7/2016 | © Robert Bosch GmbH 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as
well as in the event of applications for industrial property rights.
AE-BE/EKE-Powernet | 4/7/2016 | © Robert Bosch GmbH 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as
well as in the event of applications for industrial property rights.
Simulation of Fault Tolerant Power Supply Networks Saber Seminar, Detroit
Automotive Electronics
Complexity
3 load scenarios
2 ambient temperatures
10 power network components
27 single point faults
729 dual point faults
5000 simulations, approx. 7d calculation time
130 tests per simulation:
Extrema
Critical thresholds
Gradients
Failure Definition
Fault Tree Analysis
Single + Mul. Faults Def.
Saber Simulation
Waveform Analysis
Effect Validation
Sensitivity Analysis
Component Specifications
Fa
ult A
naly
sis
To
olc
ha
in fo
r Pro
du
ct D
eve
lopm
en
t
6 AE-BE/EKE-Powernet | 4/7/2016 | © Robert Bosch GmbH 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as
well as in the event of applications for industrial property rights.
AE-BE/EKE-Powernet | 4/7/2016 | © Robert Bosch GmbH 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as
well as in the event of applications for industrial property rights.
Simulation of Fault Tolerant Power Supply Networks Saber Seminar, Detroit
Automotive Electronics
Architecture Design – Co-Simulation
Nom
inal +
Fault
Analy
sis
Operating strategy +
components control
Normal
Drive
Boost
Start/Stop
Coasting
Recuperation
Warm StartCold Start
Clutch Start
ParkingAccessory
Wiring harness
G
S
B1
EP
S
Lo
ad
ES
P
PD
B
1,0m
35mm²
1m
25mm²
1m
25mm²
1m
4mm²
1m
10mm²
0,5m
25mm²
0,5m
35mm²
0,5m
25mm²
0,5m
4mm² 0,5m
10mm²
0,5m
35mm²
0,5m
25mm²
0,5m
25mm²DC
DC
DLC
S1
Fault injection
S
B1
14V
G
14V
SV
HV...
B2
SH
V
MATLAB
Electrical Energy Management
SABER
Powernet Model
Voltage Stability
Charge Balance
Co-Simulation
7 AE-BE/EKE-Powernet | 4/7/2016 | © Robert Bosch GmbH 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as
well as in the event of applications for industrial property rights.
AE-BE/EKE-Powernet | 4/7/2016 | © Robert Bosch GmbH 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as
well as in the event of applications for industrial property rights.
Simulation of Fault Tolerant Power Supply Networks Saber Seminar, Detroit
Automotive Electronics
Conclusion
Developing components for ADAS vehicles needs profound understanding of cause-effect
relationships in power supply networks
Classic method for analyzing fault effects are experiments on test vehicles, this would be
Expensive, time-consuming: Thousands of faults scenarios needs do be analyzed
Harmful: E.g. short cuts, component break-downs can cause dangerous effects
Using simulations instead enables development regarding Functional Safety in an cost-efficient
and flexible way
Established toolchain with SaberRD:
Automatic execution of a very large number of fault simulations
Automatic analysis of signal waveforms
Exported report as input for succeeding process steps
Effort: Robust simulation model must be developed for rated and failure operation mode
Simulation allows:
Exploring many more failure scenarios that would have otherwise gone untested
Examining of current concepts and research on future concepts
8 AE-BE/EKE-Powernet | 4/7/2016 | © Robert Bosch GmbH 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as
well as in the event of applications for industrial property rights.
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