tesla edr: a case study - university of north florida · tesla edr evidence, data, and a case...
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Tesla EDR: A Case Study
Weston Brown Sergeant, Scottsdale (AZ) Police Department
Tesla EDR
Evidence, Data, and a Case Study
Tesla Models
S
X 3
Y
Whu sed enginears don’t spel gud?
TESLA VIDEO EVIDENCE
Evidence, Data and a Case Study
Tesla Video Evidence• Tesla camera video
Tesla Video Evidence• Tesla touch screen
display– Look for the red dot
– Click on the dot to stop recording
– Remove the thumb drive
Tesla Video Evidence• Tesla touch screen
display– Look for the red dot
– Click on the dot to stop recording
– Remove the thumb drive
TESLA VEHICLE LOGS
Evidence, Data and a Case Study
Tesla Vehicle Logs – Diagnostic Data• History
– Diagnostic data is maintained in the car and updated locally every second
– Periodically updated to the cloud.– Also updates locally when an event
occurs information is reported – think “Freeze Frame”• This may be any number of changes
– Tesla makes this information available upon authority • LE can contact them with a search
warrant
– Info is delivered as a .pdf
GETTING THE EDR DATA
Evidence, Data and a Case Study
https://edr.tesla.com
Getting Tesla EDR Data
https://edr.tesla.com
Getting Tesla EDR Data
https://edr.tesla.com
Getting Tesla EDR Data
https://edr.tesla.com/help
Getting Tesla EDR Data
https://edr.tesla.com/help
Getting Tesla EDR Data
In-Vehicle Connection
Getting Tesla EDR Data
With the owner, use the app 1. Fully lower all door windows to avoid glass shatter and lock outs.
2. Move both seats fully forward.3. Disconnect 12v power.
a. Open the hood
Getting Tesla EDR Data
1. Fully lower all door windows to avoid glass shatter and lock outs.
2. Move both seats fully forward.3. Disconnect 12v power.
a. Open the hood
Not with owner, use touchscreen
In-Vehicle Connection
Getting Tesla EDR Data
1. Fully lower all door windows to avoid glass shatter and lock outs.
2. Move both seats fully forward.3. Disconnect 12v power.
a. Open the hood4. Remove RH B-pillar trim
a. Remove RH instrument panel end cap
Remove A pillar middle trim
In-Vehicle Connection
Getting Tesla EDR Data
1. Fully lower all door windows to avoid glass shatter and lock outs.
2. Move both seats fully forward.3. Disconnect 12v power.
a. Open the hood4. Remove RH B-pillar trim
a. Remove RH instrument panel end capb. Release and remove topmost clip on
RH lower A-pillar trim
Remove A pillar lower trim
In-Vehicle Connection
Getting Tesla EDR Data
1. Fully lower all door windows to avoid glass shatter and lock outs.
2. Move both seats fully forward.3. Disconnect 12v power.
a. Open the hood4. Remove RH B-pillar trim
a. Remove RH instrument panel end capb. Release and remove topmost clip on
RH lower A-pillar trim
Remove A pillar lower trim
In-Vehicle Connection
Getting Tesla EDR Data
1. Fully lower all door windows to avoid glass shatter and lock outs.
2. Move both seats fully forward.3. Disconnect 12v power.
a. Open the hood4. Remove RH B-pillar trim
a. Remove RH instrument panel end capb. Release and remove topmost clip on
RH lower A-pillar trimc. Remove B-pillar lower trim
Remove B pillar lower trim
In-Vehicle Connection
Getting Tesla EDR Data
5. At the base of the RH B-pillar, move carpet and locate the CAN bus connector.
Locate CAN bus connector
In-Vehicle Connection
Getting Tesla EDR Data
5. At the base of the RH B-pillar, move carpet and locate the CAN bus connector.
6. Press down on retention clip to release it from the wiring harness connector
7. Carefully remove the CAN bus connector from the wiring harness connector.
8. Insert the connector from the In-Vehicle EDR Retrieval Cable into the CAN bus connector on the wiring harness.
9. Supply power to the RCM as described in “Powering Up the Vehicle.”
Separate CAN wiring harness plug
In-Vehicle Connection
Getting Tesla EDR DataIn-Vehicle Connection
https://edr.tesla.com/help
Getting Tesla EDR Data
1. Connect the negative cable to the batteryBattery is located in the “frunk”
https://edr.tesla.com/help
Getting Tesla EDR Data
1. Connect the negative cable to the battery2. Sit in the driver’s seat3. Scan keycard by placing it on the card
reader located to the rear of the cup holders in the center console
The driver’s seat is the one closest to us in the picture
https://edr.tesla.com/help
Getting Tesla EDR Data
1. Connect the negative cable to the battery2. Sit in the driver’s seat3. Scan keycard by placing it on the card
reader located to the rear of the cup holders in the center console
4. Press and hold the brake pedal until the center screen shows the P R N D Icons.
P R N D and airbag lights
https://edr.tesla.com/help
Getting Tesla EDR Data
1. Choose which First Responder Loop to use
a. Frontb. Rear (outside vehicle)c. Rear (inside vehicle)
Front First Responder Loop
https://edr.tesla.com/help
Getting Tesla EDR Data
1. Choose which First Responder Loop to use
a. Frontb. Rear (outside vehicle)c. Rear (inside vehicle)
Rear Outside First Responder Loop
https://edr.tesla.com/help
Getting Tesla EDR Data
1. Choose which First Responder Loop to use
a. Frontb. Rear (outside vehicle)c. Rear (inside vehicle)
2. Expose chosen loop.3. Cut the loop (in location shown)4. Remove harness from sheath to strip 2
inches of wire5. Separate yellow wire from other three
Rear Inside First Responder Loop
https://edr.tesla.com/help
Getting Tesla EDR Data
1. Choose which First Responder Loop to use
a. Frontb. Rear (outside vehicle)c. Rear (inside vehicle)
2. Expose chosen loop.3. Cut the loop (in location shown)4. Remove harness from sheath to strip 2
inches of wire5. Separate yellow wire from other three.6. Strip ½” of wire from the end of the
yellow wire as indicated
Front First Responder Loop
https://edr.tesla.com/help
Getting Tesla EDR Data
7. Connect ground to chassis8. Connect the positive output of 12V
power supply to the yellow wire.9. Turn on external power supply10. Prepare to connect to the RCM
Rear First Responder Loop
Get the Data
Getting Tesla EDR Data
1. Connect the Tesla in-vehicle EDR retrieval cable to the PCAN-USB Adapter
PCAN-USB Adapter
Get the Data
Getting Tesla EDR Data
1. Connect the Tesla in-vehicle EDR retrieval cable to the PCAN-USB Adapter
2. Connect the PCAN-USB adapter to the computer.
3. Open the Tesla EDR Retrieval program
PCAN-USB Adapter
Get the Data
Getting Tesla EDR Data
1. Connect the Tesla in-vehicle EDR retrieval cable to the PCAN-USB Adapter
2. Connect the PCAN-USB adapter to the computer.
3. Open the Tesla EDR Retrieval programa. When connected properly a green
circle and message confirming connection appear
b. If not connected properly a red light will appear
Tesla EDR Tool screen
Get the Data
Getting Tesla EDR Data
1. Connect the Tesla in-vehicle EDR retrieval cable to the PCAN-USB Adapter
2. Connect the PCAN-USB adapter to the computer.
3. Open the Tesla EDR Retrieval programa. When connected properly a green
circle and message confirming connection appear
b. If not connected properly a red light will appear
4. Once connected, click “Run EDR Retrieval”
Tesla EDR Tool screen
Get the Data
Getting Tesla EDR Data
1. Connect the Tesla in-vehicle EDR retrieval cable to the PCAN-USB Adapter
2. Connect the PCAN-USB adapter to the computer.
3. Open the Tesla EDR Retrieval programa. When connected properly a green
circle and message confirming connection appear
b. If not connected properly a red light will appear
4. Once connected, click “Run EDR Retrieval”
Tesla EDR Tool screen
See the Data
Generating Tesla EDR Report
1. Log in2. Select File to Upload3. Submit4. Download Report5. Save to your computer
TESLA EDR REPORT
Evidence, Data and a Case Study
Released in March of 2018Contains NHTSA 563 compliant information
❑ Event Info❑ Max Dvx – kph❑ Time to Max Dvx – ms (Table 2)
❑ Max Dvy – kph (Table 2)
❑ Time to Max Dvy – ms (Table 2)
❑ Ignition Cycles at event❑ Airbag MIL Status❑ Seatbelt buckled (Driver)
❑ Seatbelt buckled (Pass, Table 2)
❑ Passenger classification (Child?)
❑ Driver Seat Track Position❑ Complete file recorded– yes/no
❑ Crash Info❑ Dvx – 300ms❑ Dvy – 300 ms (Table 2)
❑ Long Accel – 300 ms (Table 2)
❑ Lat Accel – 300 ms (Table 2)
❑ Roll angle - -1s to 5s (Table 2)
❑ Time to Max DvS – ms (Table 2)
❑ Pre-Crash Info❑ Vehicle Speed (kph)❑ Accelerator Pedal (%)❑ Motor Speed (not in regulation)
❑ Service Brake❑ Steering Wheel Angle (Table 2)
❑ Stability Control (Table 2)
❑ ABS Activity (Table 2)
The Tesla EDR Report
The Tesla EDR• Data
Limitations
• Excellent, detailed Data Limitations
Data LimitationsThe Tesla EDR Report
Data LimitationsThe Tesla EDR Report
Data LimitationsThe Tesla EDR Report
Data LimitationsThe Tesla EDR Report
Data LimitationsThe Tesla EDR Report
File InformationThe Tesla EDR Report
Data RecordThe Tesla EDR Report
Deployment SummaryThe Tesla EDR Report
Event DataThe Tesla EDR Report
Event DataThe Tesla EDR Report
Steering Wheel AngleThe Tesla EDR Report
PRECRASH Lateral AccelerationThe Tesla EDR Report
PRECRASH Longitudinal AccelerationThe Tesla EDR Report
PRECRASH Roll RateThe Tesla EDR Report
PRECRASH Yaw RateThe Tesla EDR Report
Crash Longitudinal DvThe Tesla EDR Report
Crash Lateral DvThe Tesla EDR Report
Crash Longitudinal AccelerationThe Tesla EDR Report
Crash Longitudinal AccelerationThe Tesla EDR Report
Crash Longitudinal AccelerationThe Tesla EDR Report
Billable hours for the mathemagically impaired
The Tesla EDR Report
CASE STUDY
Evidence, Data and a Case Study
The Vehicles
❑ 2014 Tesla Model S ❑ 2016 Zero SR
The Scene
The Scene
The Scene
The Scene
The Scene
The Scene
The Scene
• Total Scene Distance: 357 feet
• Motorcyclist throw distance: 262 feet
• Motorcycle throw distance: 226 feet
• Motorcycle tumbling distance*: 121 feet
• Tesla post impact distance braking: 354 feet
* Motorcycle tangled with barb wire fencing at final rest
Overall impression of speed?
357 feet
The Scene
Speed - Where do we start?Searle
• Motorcyclist throw distance known (262 feet)
• Projection angle unknown
• Bracket speeds:– Min = 61MPH
– 20o = 65 MPH
– Max = 78 MPH
Momentum
• Tesla post impact distance known (354 feet), f value not known
• MC post-impact unknown, MC is caught in fence
Tesla Diagnostic Data• Tesla responded within one week with
the data
• Response included all of the requested data along with this:
• “You may find it relevant to refer to the attached page from the Model S Owner’s Manual, which explains, ‘…”
• Please see attached page from the Owner’s Manual
Tesla Diagnostic Data• EDR Data available at time of collision was just the telematics
• Good for Law Enforcement
• Warrant sent to Tesla directly with specific information requested• Speed • Brake switch• Accelerator Pedal• Steering Wheel Angle• Forward Looking Brake Assist• Be careful what you ask for, if you ask for it all, you get it all!
Tesla Diagnostic Data
Tesla Diagnostic Data• Event data
neatly recorded
• Tesla only gives you the data, you must interpret and determine where the crash happens
Tesla Diagnostic Data
Tesla Diagnostic Data
Tesla Diagnostic Data
Crash happens in this one second period
Speed Accel Pedal Steering
Getting the EDR Data
• Tesla gives great instructions . . .
Getting the EDR Data
• Tesla gives great instructions . . .
Getting the EDR Data
• Direct to Module:
Getting the EDR Data
• Direct to Module:
– 1. Remove the Left Hand wrapped panel trim
– 2. Release the clips that secure the panel trim
– 3. Remove floor mat
Getting the EDR Data• Direct to Module:
– 4. Remove the Left Hand side panel
– 5. Release clips and adhesive securing the side panel
– CAUTION: Take care not to damage components
– 6. Remove the center console panel
Getting the EDR Data• Direct to Module:
- 7a. Remove the bolts that secure the air
suspension mounting bracket to the body
- 7b. Repeat steps 1 – 6 on the right side….
Getting the EDR Data
• Direct to Module:
– 8. From the left hand footwell, disconnect the HVAC drain hose from the HVAC nipple
The Tesla EDR Data
❑ Data Limitations
❑ What is significant in a typical analysis?
The Tesla EDR Data
• Data Limitations
– Polarity?
+
The Tesla EDR Data
• Data Limitations
– Polarity?
The Tesla EDR Data
• Data Limitations
– Vehicle Speed:
The Tesla EDR Data
The Tesla EDR Data
Steering
Wheel
Resolution,
4.20
+
The Tesla EDR Data – Pre-Crash data
82 MPH
The Tesla EDR Data – Pre-Crash data
105 MPH
Last Speed0.8 g’s
0.8 g’s
82 82Braking
Speedo
-8.50
-3.28
0.00
+3.28
74mph 89mph
t =Dv
a
t =0.8333m / s
7.84m / s2
t = 0.1062
0.10sWheel Slip +4.10+4.10
Low High
The Tesla EDR Data - Pre-crash data
-10.5 MPH
The Tesla EDR Data
The Tesla EDR Data
The Tesla EDR Data
Low end Dv occurs here
The Tesla EDR Data
High end Dv occurs here
The Vehicles
❑ 2014 Tesla Model S ❑ 2016 Zero SR
Vehicle Data:Curb Weight: 4722Driver: 130Total: 4852
Vehicle Data:Curb Weight: 415Driver: 215Total: 630
18”
Center of massArea of impact
The Tesla
ACM
location
along the
Center of
mass
Area of
impact
18
”
The Tesla
Vehicle Data:Curb Weight: 4722Driver: 130Total: 4852
Vehicle Data:Curb Weight: 415Driver: 108Total: 523
Dv2
= -Dv1
w1
w2
æ
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ø÷÷
Dv2
= -(-8.27)4852
523
æ
èç
ö
ø÷
Dv2
= (8.27)(9.27)
Dv2
= 76.66mph
Sclose
=1
1+ e
æ
èç
ö
ø÷
Dv1
g1
+Dv
2
g2
æ
è
çç
ö
ø
÷÷
Sclose
=1
1+0.05
æ
èç
ö
ø÷
-8.27
0.9429+
76.66
1
æ
è
çç
ö
ø
÷÷
Sclose
= 0.9524( ) 85.43( )Sclose
= 81mph
Dvgf
= (17.56mph / s)(0.06s)
Dvgf
=1.05mph
Dv1= (-9.32)+ (1.05)
Dv1= -8.27mph
Closing Speed Calculations
Consider the possible EDR Dv Error:Part 563 allows for
+/- 10%
Closing Speed Calculations (Low)
Dv2low
= -Dv1
w1
w2
æ
èçç
ö
ø÷÷
Dv2Low
= -(-7.34)4852
523
æ
èç
ö
ø÷
Dv2Low
= (7.34)(9.27)
Dv2Low
= 68.07mph
Sclose
=1
1+ e
æ
èç
ö
ø÷
Dv1
g1
+Dv
2
g2
æ
è
çç
ö
ø
÷÷
Sclose
=1
1+0.05
æ
èç
ö
ø÷
-7.34
0.9429+
68.07
1
æ
è
çç
ö
ø
÷÷
Sclose
= 0.9524( ) 75.85( )Sclose
= 72mph
Closing Speed Calculations (Low)Consider the possible EDR Dv Error:
Part 563 allows for +/- 10%
Dv2high
= -Dv1
w1
w2
æ
èçç
ö
ø÷÷
Dv2high
= -(-9.20)4852
523
æ
èç
ö
ø÷
Dv2high
= (9.20)(9.27)
Dv2high
= 85.36mph
Sclose
=1
1+ e
æ
èç
ö
ø÷
Dv1
g1
+Dv
2
g2
æ
è
çç
ö
ø
÷÷
Sclose
=1
1+0.05
æ
èç
ö
ø÷
-9.20
0.9429+
85.36
1
æ
è
çç
ö
ø
÷÷
Sclose
= 0.9524( ) 95.12( )Sclose
= 90mph
Closing Speed Calculations (High)Consider the possible EDR Dv Error:
Part 563 allows for +/- 10%
The Video
The Video
Video Calculations
Video Calculations
Video Calculations• The downloaded video was 854 x 480 resolution at 29 frames per
second, and upon closer inspection the frame rate was inflated by frame duplication
• Six duplicate frames were displayed before a truly new frame was reached.
• The videos obtained directly from the Porsche dealer were 1280 x 960 resolution (4:3 aspect ratio) at 5 frames per second
Frame 800
Video Calculations
Video Calculations
Frame 800
Video Calculations
Time stamp between frames 800 and 813 shows precisely 2.6 seconds
Video Calculations
Video Calculations
• Now it is a simple Time Distance Analysis:
Overview
• Remember this data?
Overview
• Remember this data?
Average Speed = 98mph
• Remember this data?
Average Speed = 98mph
Overview
Where do YOU land on speed?
• What is important in this case?
– Speed at impact?
– Speed and driving behavior overall?
Questions?