tesla edr: a case study - university of north florida · tesla edr evidence, data, and a case...

Tesla EDR: A Case Study

Weston Brown Sergeant, Scottsdale (AZ) Police Department

Tesla EDR

Evidence, Data, and a Case Study

Tesla Models

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

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

https://edr.tesla.com

Getting Tesla EDR Data

https://edr.tesla.com/help

In-Vehicle Connection

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

1. Fully lower all door windows to avoid glass shatter and lock outs.

a. Open the hood

Not with owner, use touchscreen

a. Open the hood4. Remove RH B-pillar trim

a. Remove RH instrument panel end cap

Remove A pillar middle trim

a. Remove RH instrument panel end capb. Release and remove topmost clip on

RH lower A-pillar trim

Remove A pillar lower trim

RH lower A-pillar trim

Remove A pillar lower trim

RH lower A-pillar trimc. Remove B-pillar lower trim

Remove B pillar lower trim

5. At the base of the RH B-pillar, move carpet and locate the CAN bus connector.

Locate CAN bus connector

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

Getting Tesla EDR DataIn-Vehicle Connection

1. Connect the negative cable to the batteryBattery is located in the “frunk”

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

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

1. Choose which First Responder Loop to use

a. Frontb. Rear (outside vehicle)c. Rear (inside vehicle)

Front First Responder Loop

Rear Outside First Responder Loop

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

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

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

1. Connect the Tesla in-vehicle EDR retrieval cable to the PCAN-USB Adapter

PCAN-USB Adapter

Get the Data

2. Connect the PCAN-USB adapter to the computer.

3. Open the Tesla EDR Retrieval program

PCAN-USB Adapter

Get the Data

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

4. Once connected, click “Run EDR Retrieval”

Get the Data

4. Once connected, click “Run EDR Retrieval”

See the Data

Generating Tesla EDR Report

1. Log in2. Select File to Upload3. Submit4. Download Report5. Save to your computer

TESLA EDR REPORT

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

File InformationThe Tesla EDR Report

Data RecordThe Tesla EDR Report

Deployment SummaryThe 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

Billable hours for the mathemagically impaired

The Tesla EDR Report

CASE STUDY

The Vehicles

❑ 2014 Tesla Model S ❑ 2016 Zero SR

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

Crash happens in this one second period

Speed Accel Pedal Steering

Getting the EDR Data

• Tesla gives great instructions . . .

• 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….

– 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

– Polarity?

The Tesla EDR Data

– Vehicle Speed:

The Tesla EDR Data

Steering

Resolution,

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

74mph 89mph

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

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

Center of massArea of impact

The Tesla

location

along the

Center of

Area of

impact

The Tesla

= -Dv1

èçç

ø÷÷

= -(-8.27)4852

= (8.27)(9.27)

= 76.66mph

Sclose

1+0.05

0.9429+

Sclose

= 0.9524( ) 85.43( )Sclose

= 81mph

= (17.56mph / s)(0.06s)

=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

èçç

ø÷÷

Dv2Low

= -(-7.34)4852

Dv2Low

= (7.34)(9.27)

Dv2Low

= 68.07mph

Sclose

1+0.05

0.9429+

Sclose

= 0.9524( ) 75.85( )Sclose

= 72mph

Closing Speed Calculations (Low)Consider the possible EDR Dv Error:

Part 563 allows for +/- 10%

Dv2high

= -Dv1

èçç

ø÷÷

Dv2high

= -(-9.20)4852

Dv2high

= (9.20)(9.27)

Dv2high

= 85.36mph

Sclose

1+0.05

0.9429+

Sclose

= 0.9524( ) 95.12( )Sclose

= 90mph

Closing Speed Calculations (High)Consider the possible EDR Dv Error:

Part 563 allows for +/- 10%

The Video

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

Frame 800

Video Calculations

Time stamp between frames 800 and 813 shows precisely 2.6 seconds

Video Calculations

• Now it is a simple Time Distance Analysis:

Overview

• Remember this data?

Overview

Average Speed = 98mph

Overview

Where do YOU land on speed?

• What is important in this case?

– Speed at impact?

– Speed and driving behavior overall?

Contact Information

West Brown

Phone:(o) 480-312-2666(c) 480-215-6915

Email:n3283f@yahoo.com

orwbrown@scottsdaleaz.gov

Questions?

tesla edr: a case study - university of north florida · tesla edr evidence, data, and a case...

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