Event Data Recorder
Encyclopedia
An event data recorder or EDR is a device installed in some automobile
s to record information related to vehicle crashes or accidents
. In modern diesel truck
s, EDRs are triggered by electronically sensed problems in the engine (often called faults), or a sudden change in wheel speed. One or more of these conditions may occur because of an accident. Information from these devices can be collected after a crash and analyzed to help determine what the vehicles were doing before, during and after the crash or event. The term generally refers to a simple, tamper-proof, read-write memory
device, similar to the "black box
" found on airplanes (as opposed to the tape recorders and video cameras common in police vehicles and many commercial trucks).
s related to various types of EDR features. Some EDRs continuously record data, overwriting the previous few minutes until a crash stops them, and others are activated by crash-like events (such as sudden changes in velocity) and may continue to record until the accident is over, or until the recording time is expired. EDRs may record a wide range of data elements, potentially including whether the brake
s were applied, the speed at the time of impact, the steering angle, and whether seat belt
circuits were shown as "Buckled" or "Unbuckled" at the time of the crash. Current EDRs store the information internally on an EEPROM
until recovered from the module. Some vehicles have communications systems (such as GM
's OnStar
system) that may transmit some data, such as an alert that the airbags have been deployed, to a remote location.
Most EDRs in automobiles and light trucks are part of the restraint system control module, which senses impact accelerations and determines what restraints (airbags and/or seatbelt tensioners) to deploy. After the deployment (or non-deployment) decisions are made, and if there is still power available, the data are written to memory. The data downloaded from older EDRs usually contain 6 to 8 pages of information, though many newer systems include many more data elements and require more pages, depending on the make/model/year of the vehicle being evaluated. Depending on the type of EDR, it may contain either a deployment file or a non-deployment file or sometimes both, depending on the circumstances of the collisions and the time interval between them, among other things.
It is also possible that no data can be recovered from a data recorder. One situation where this might occur is a catastrophic loss of electrical power early in a collision event. In this situation, the power reserve in the restraint system control module capacitors may be completely spent by the deployment of the air bags, leaving insufficient power to write data to the EEPROM. There are other circumstances where a module may fail to record a data file as well.
Most EDRs in heavy trucks are part of the engine electronic control module (ECM), which controls fuel injection timing and other functions in modern heavy-duty diesel engines. The EDR functions are different for different engine manufacturers, but most recognize engine events such as sudden stops, low oil pressure, or coolant loss. Detroit Diesel
, Caterpillar Inc.
, Mercedes-Benz
, Mack Trucks
, and Cummins
engines are among those that may contain this function. When a fault-related event occurs, the data is written to memory. When an event triggered by a reduction in wheel speed is sensed, the data that is written to memory can include almost two minutes of data about vehicle speed, brake application, clutch application, and cruise control status. The data can be downloaded later using the computer software and cables for the specific engine involved. These software tools often allow monitoring of the driver hours of service
, fuel economy, idle time, average travel speeds, and other information related to the maintenance and operation of the vehicle.
Some EDRs only keep track of the car's speed along its length and not the speed going sideways. Analysts generally look at the momentum, energy, and crush damage, and then compare their speed estimates to the number coming out of the EDR to create a complete view of the accident.
Because EDRs are not currently required by law, usage of the device varies widely from manufacturer to manufacturer. General Motors and Ford implement the technology on most of their recent models, while Mercedes-Benz and Audi do not use EDRs at all. As of 2003, there were at least 40 million vehicles equipped with the devices. In the UK many police and emergency service vehicles are fitted with a more accurate and detailed version that is produced by one of several independent companies. Both the Metropolitan police and the City of London police are long-term users of EDRs and have used the data recovered after an incident to convict both police officers and members of the public.
Downloading an airbag module in most vehicles is best accomplished by connecting the appropriate scanning tool to the Diagnostic Link Connector (DLC) usually found under the vehicle's dashboard near the driver's knees. The photo to the right shows a DLC download in progress. Alternately, some modules can be downloaded "on the bench" after removal from the vehicle, as shown to the left.
The only system, capable of downloading commercially available crash data in North America, is Bosch Diagnostic's Crash Data Retrieval System.
(NHTSA) sponsored a working group specifically tasked with the study of EDRs. After years of evaluation, NHTSA released a formal Notice of Proposed Rulemaking in 2004. This notice declared NHTSA’s intent to standardize EDRs. It was not until August 2006 that NHTSA released its final ruling (49 CFR Part 563). The ruling was lengthy (207 pages), consisting of not only definitions and mandatory EDR standards, but also acted as a formal reply to the dozens of petitions received by NHTSA after the 2004 notice.
Since there was already an overwhelming trend for voluntary EDR installation, the ruling did not require manufacturers to install EDRs in vehicles produced for North America. Based on its analysis, NHTSA estimated that by 2010, over 85% of vehicles would already have EDRs installed in them, but warned that if the trend did not continue, the agency would revisit their decision and possibly make installation a requirement.
The mandate did, however, provide a minimum standard for the type of data that EDRs would be required to record: at least 15 types of crash data. Some of the required crash data include pre-crash speed, engine throttle, brake use, measured changes in forward velocity (Delta-V), driver safety belt use, airbag warning lamp status and airbag deployment times.
In addition to the required data, NHTSA also set standards for 30 other types of data if EDRs were voluntarily configured to record them. For example, if a manufacturer configured an EDR to record engine RPMs or ABS activity, then the EDR would have to record 5 seconds of those pre-crash data in half-second increments.
Besides the requirement that all data be able to survive a 30 MPH barrier crash and be measured with defined precision, NHTSA also required that all manufacturers make their EDR data publicly available. As of October 2009, only General Motors, Ford and Daimler Chrysler had released their EDR data to be publicly read.
In the August 2006 ruling, NHTSA set a time table for all vehicle manufacturers to be in compliance with the new EDR standards. The compliance date was originally set for all vehicles manufactured after September 1, 2010. NHTSA has since updated its ruling (49 CFR Part 563 Update) to give vehicle manufacturers until September 1, 2012 to be in compliance with the original ruling.
Thirteen states have statutes specific to EDRs. Generally, these state statutes restrict access to the EDR or limit the use of recovered EDR information.
Other examples include:
Jon Corzine
was seriously injured in an automobile accident. According to the superintendent of state police, an Event Data Recorder in the SUV he was traveling in recorded he was traveling at about 91 MPH five seconds before the crash. The speed limit on the road is 65 MPH. The Governor was not the driver of the vehicle.
Automobile
An automobile, autocar, motor car or car is a wheeled motor vehicle used for transporting passengers, which also carries its own engine or motor...
s to record information related to vehicle crashes or accidents
Car accident
A traffic collision, also known as a traffic accident, motor vehicle collision, motor vehicle accident, car accident, automobile accident, Road Traffic Collision or car crash, occurs when a vehicle collides with another vehicle, pedestrian, animal, road debris, or other stationary obstruction,...
. In modern diesel truck
Truck
A truck or lorry is a motor vehicle designed to transport cargo. Trucks vary greatly in size, power, and configuration, with the smallest being mechanically similar to an automobile...
s, EDRs are triggered by electronically sensed problems in the engine (often called faults), or a sudden change in wheel speed. One or more of these conditions may occur because of an accident. Information from these devices can be collected after a crash and analyzed to help determine what the vehicles were doing before, during and after the crash or event. The term generally refers to a simple, tamper-proof, read-write memory
Read-write memory
Read-write memory is a type of computer memory that may be relatively easily written to as well as read from . The term RAM is often used to describe writable memory. RAM actually referring to memory that can be accessed at any "location"....
device, similar to the "black box
Flight data recorder
A flight data recorder is an electronic device employed to record any instructions sent to any electronic systems on an aircraft. It is a device used to record specific aircraft performance parameters...
" found on airplanes (as opposed to the tape recorders and video cameras common in police vehicles and many commercial trucks).
Operation
There are many different patentPatent
A patent is a form of intellectual property. It consists of a set of exclusive rights granted by a sovereign state to an inventor or their assignee for a limited period of time in exchange for the public disclosure of an invention....
s related to various types of EDR features. Some EDRs continuously record data, overwriting the previous few minutes until a crash stops them, and others are activated by crash-like events (such as sudden changes in velocity) and may continue to record until the accident is over, or until the recording time is expired. EDRs may record a wide range of data elements, potentially including whether the brake
Brake
A brake is a mechanical device which inhibits motion. Its opposite component is a clutch. The rest of this article is dedicated to various types of vehicular brakes....
s were applied, the speed at the time of impact, the steering angle, and whether seat belt
Seat belt
A seat belt or seatbelt, sometimes called a safety belt, is a safety harness designed to secure the occupant of a vehicle against harmful movement that may result from a collision or a sudden stop...
circuits were shown as "Buckled" or "Unbuckled" at the time of the crash. Current EDRs store the information internally on an EEPROM
EEPROM
EEPROM stands for Electrically Erasable Programmable Read-Only Memory and is a type of non-volatile memory used in computers and other electronic devices to store small amounts of data that must be saved when power is removed, e.g., calibration...
until recovered from the module. Some vehicles have communications systems (such as GM
General Motors
General Motors Company , commonly known as GM, formerly incorporated as General Motors Corporation, is an American multinational automotive corporation headquartered in Detroit, Michigan and the world's second-largest automaker in 2010...
's OnStar
OnStar
OnStar Corporation is a subsidiary of General Motors that provides subscription-based communications, in-vehicle security, hands free calling, turn-by-turn navigation, and remote diagnostics systems throughout the United States, Canada and China. A similar service is known as ChevyStar in Latin...
system) that may transmit some data, such as an alert that the airbags have been deployed, to a remote location.
Most EDRs in automobiles and light trucks are part of the restraint system control module, which senses impact accelerations and determines what restraints (airbags and/or seatbelt tensioners) to deploy. After the deployment (or non-deployment) decisions are made, and if there is still power available, the data are written to memory. The data downloaded from older EDRs usually contain 6 to 8 pages of information, though many newer systems include many more data elements and require more pages, depending on the make/model/year of the vehicle being evaluated. Depending on the type of EDR, it may contain either a deployment file or a non-deployment file or sometimes both, depending on the circumstances of the collisions and the time interval between them, among other things.
It is also possible that no data can be recovered from a data recorder. One situation where this might occur is a catastrophic loss of electrical power early in a collision event. In this situation, the power reserve in the restraint system control module capacitors may be completely spent by the deployment of the air bags, leaving insufficient power to write data to the EEPROM. There are other circumstances where a module may fail to record a data file as well.
Most EDRs in heavy trucks are part of the engine electronic control module (ECM), which controls fuel injection timing and other functions in modern heavy-duty diesel engines. The EDR functions are different for different engine manufacturers, but most recognize engine events such as sudden stops, low oil pressure, or coolant loss. Detroit Diesel
Detroit Diesel
As a corporation, Daimler Trucks North America has decided to rename the company "DETROIT".Detroit Diesel Corporation is an American-based diesel engine producer headquartered in Detroit, Michigan, USA...
, Caterpillar Inc.
Caterpillar Inc.
Caterpillar Inc. , also known as "CAT", designs, manufactures, markets and sells machinery and engines and sells financial products and insurance to customers via a worldwide dealer network. Caterpillar is the world's largest manufacturer of construction and mining equipment, diesel and natural gas...
, Mercedes-Benz
Mercedes-Benz
Mercedes-Benz is a German manufacturer of automobiles, buses, coaches, and trucks. Mercedes-Benz is a division of its parent company, Daimler AG...
, Mack Trucks
Mack Trucks
Mack Trucks is an American truck-manufacturing company and a former manufacturer of buses and trolley buses. A wholly owned subsidiary of Renault Véhicules Industriels since 1990, Mack Trucks is currently a subsidiary of AB Volvo. The company's headquarters are located in Greensboro, North Carolina...
, and Cummins
Cummins
Cummins Inc. is a Fortune 500 corporation that designs, manufactures, distributes and services engines and related technologies, including fuel systems, controls, air handling, filtration, emission control and electrical power generation systems...
engines are among those that may contain this function. When a fault-related event occurs, the data is written to memory. When an event triggered by a reduction in wheel speed is sensed, the data that is written to memory can include almost two minutes of data about vehicle speed, brake application, clutch application, and cruise control status. The data can be downloaded later using the computer software and cables for the specific engine involved. These software tools often allow monitoring of the driver hours of service
Hours of service
The hours of service are regulations issued by the Federal Motor Carrier Safety Administration governing the working hours of anyone operating a commercial motor vehicle in the United States for the purpose of "interstate commerce"— moving commercial goods from one U.S. state to another...
, fuel economy, idle time, average travel speeds, and other information related to the maintenance and operation of the vehicle.
Some EDRs only keep track of the car's speed along its length and not the speed going sideways. Analysts generally look at the momentum, energy, and crush damage, and then compare their speed estimates to the number coming out of the EDR to create a complete view of the accident.
Practice
Downloading an airbag module in most vehicles is best accomplished by connecting the appropriate scanning tool to the Diagnostic Link Connector (DLC) usually found under the vehicle's dashboard near the driver's knees. The photo to the right shows a DLC download in progress. Alternately, some modules can be downloaded "on the bench" after removal from the vehicle, as shown to the left.
The only system, capable of downloading commercially available crash data in North America, is Bosch Diagnostic's Crash Data Retrieval System.
NHTSA's Event Data Recorder Ruling
From 1998 to 2001, the National Highway Traffic Safety AdministrationNational Highway Traffic Safety Administration
The National Highway Traffic Safety Administration is an agency of the Executive Branch of the U.S. government, part of the Department of Transportation...
(NHTSA) sponsored a working group specifically tasked with the study of EDRs. After years of evaluation, NHTSA released a formal Notice of Proposed Rulemaking in 2004. This notice declared NHTSA’s intent to standardize EDRs. It was not until August 2006 that NHTSA released its final ruling (49 CFR Part 563). The ruling was lengthy (207 pages), consisting of not only definitions and mandatory EDR standards, but also acted as a formal reply to the dozens of petitions received by NHTSA after the 2004 notice.
Since there was already an overwhelming trend for voluntary EDR installation, the ruling did not require manufacturers to install EDRs in vehicles produced for North America. Based on its analysis, NHTSA estimated that by 2010, over 85% of vehicles would already have EDRs installed in them, but warned that if the trend did not continue, the agency would revisit their decision and possibly make installation a requirement.
The mandate did, however, provide a minimum standard for the type of data that EDRs would be required to record: at least 15 types of crash data. Some of the required crash data include pre-crash speed, engine throttle, brake use, measured changes in forward velocity (Delta-V), driver safety belt use, airbag warning lamp status and airbag deployment times.
In addition to the required data, NHTSA also set standards for 30 other types of data if EDRs were voluntarily configured to record them. For example, if a manufacturer configured an EDR to record engine RPMs or ABS activity, then the EDR would have to record 5 seconds of those pre-crash data in half-second increments.
Besides the requirement that all data be able to survive a 30 MPH barrier crash and be measured with defined precision, NHTSA also required that all manufacturers make their EDR data publicly available. As of October 2009, only General Motors, Ford and Daimler Chrysler had released their EDR data to be publicly read.
In the August 2006 ruling, NHTSA set a time table for all vehicle manufacturers to be in compliance with the new EDR standards. The compliance date was originally set for all vehicles manufactured after September 1, 2010. NHTSA has since updated its ruling (49 CFR Part 563 Update) to give vehicle manufacturers until September 1, 2012 to be in compliance with the original ruling.
Privacy concerns
Despite alerts and warnings in their vehicle owner's manual, many drivers are not aware of their vehicle's recording capability. Civil liberty and privacy groups have raised concerns about the implications of data recorders 'spying' on car users, particularly as the issue of 'who owns the data' has not yet been fully resolved, and there has been some controversy over the use of recorded data as evidence in court cases and for insurance claims against the driver of a crashed vehicle. But the use of EDR data in civil and criminal court cases is on the rise as they become more accepted as a source reliable empirical evidence in accident reconstruction.Thirteen states have statutes specific to EDRs. Generally, these state statutes restrict access to the EDR or limit the use of recovered EDR information.
Use as evidence in courts
There have been a number of trial cases in the US and Canada involving EDRs. Drivers have been convicted and exonerated as a result of EDR evidence.Other examples include:
- In New South WalesNew South WalesNew South Wales is a state of :Australia, located in the east of the country. It is bordered by Queensland, Victoria and South Australia to the north, south and west respectively. To the east, the state is bordered by the Tasman Sea, which forms part of the Pacific Ocean. New South Wales...
, Australia, a teen-aged woman (a probationary driver) was convicted of dangerous driving "causing death/occasioning grievous bodily harm" in 2005. Evidence from the PeugeotPeugeotPeugeot is a major French car brand, part of PSA Peugeot Citroën, the second largest carmaker based in Europe.The family business that precedes the current Peugeot company was founded in 1810, and manufactured coffee mills and bicycles. On 20 November 1858, Emile Peugeot applied for the lion...
's EDR showed that the car was being driven in excess of the posted speed limit. An injunction against the use of EDR evidence, obtained by the owner of the car (the parents of the defendant), was overturned in the NSW Supreme Court. - In QuebecQuebecQuebec or is a province in east-central Canada. It is the only Canadian province with a predominantly French-speaking population and the only one whose sole official language is French at the provincial level....
, Canada, the driver of a car who sped through a red light, crashing into another car at the intersection and killing the other driver, was convicted of "dangerous driving" in 2001 after EDR information revealed that it was he, not the deceased driver of the other car (as the defendant asserted), who was speeding. There were no other witnesses to the crash. - The first such use of EDR evidence in the United KingdomUnited KingdomThe United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...
was at BirminghamBirminghamBirmingham is a city and metropolitan borough in the West Midlands of England. It is the most populous British city outside the capital London, with a population of 1,036,900 , and lies at the heart of the West Midlands conurbation, the second most populous urban area in the United Kingdom with a...
Crown CourtCrown CourtThe Crown Court of England and Wales is, together with the High Court of Justice and the Court of Appeal, one of the constituent parts of the Senior Courts of England and Wales...
during the trial of a 21 year old man who crashed the Range Rover SportRange Rover SportThe Range Rover Sport is a luxury-type sport utility vehicle produced by the Jaguar Land Rover business unit of India's Tata Motors.-Chassis:...
he was driving into a JeepJeepJeep is an automobile marque of Chrysler . The first Willys Jeeps were produced in 1941 with the first civilian models in 1945, making it the oldest off-road vehicle and sport utility vehicle brand. It inspired a number of other light utility vehicles, such as the Land Rover which is the second...
in 2006. The accident left a baby girl paralyzed and the driver, who was aged 19 at the time of the incident, was sentenced to 21 months in prison. The EDR evidence allowed investigators to determine the driver was speeding at 72 mph in a 30 mph zone.
Notable
On 12 April 2007, N.J. GovernorGovernor of New Jersey
The Office of the Governor of New Jersey is the executive branch for the U.S. state of New Jersey. The office of Governor is an elected position, for which elected officials serve four year terms. While individual politicians may serve as many terms as they can be elected to, Governors cannot be...
Jon Corzine
Jon Corzine
Jon Stevens Corzine is the former CEO of Goldman Sachs and of MF Global, and a one time American politician, who served as the 54th Governor of New Jersey from 2006 to 2010. A Democrat, Corzine served five years of a six-year U.S. Senate term representing New Jersey before being elected Governor...
was seriously injured in an automobile accident. According to the superintendent of state police, an Event Data Recorder in the SUV he was traveling in recorded he was traveling at about 91 MPH five seconds before the crash. The speed limit on the road is 65 MPH. The Governor was not the driver of the vehicle.
Video Event Data Recorder
A Video Event Data Recorder (VEDR) is a device that records video in a vehicle to create a record of accidents and for evaluating driver and vehicle performance.- An ambulance company in IrelandIrelandIreland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...
had installed VEDRs in their fleet and had an accident, involving a third party, successfully recover all costs from the third party insurance companies (RoadScan.co.uk).
See also
- TachographTachographA tachograph is a device fitted to a vehicle that automatically records its speed and distance, together with the driver's activity selected from a choice of modes. The drive mode is activated automatically when the vehicle is in motion, and modern tachograph heads usually default to the other work...
- Black box (transportation)Black Box (transportation)The term black box is a placeholder name used casually to refer to a collection of several different recording devices used in transportation: the flight recorders in aircraft, the event recorder in railway locomotives, the event data recorder in automobiles, message case in ships, and other...
- Data loggerData loggerA data logger is an electronic device that records data over time or in relation to location either with a built in instrument or sensor or via external instruments and sensors. Increasingly, but not entirely, they are based on a digital processor...
- Vehicular accident reconstructionVehicular accident reconstructionVehicular accident reconstruction is the scientific process of investigating, analyzing, and drawing conclusions about the causes and events during a vehicle collision...
- Forensic engineeringForensic engineeringForensic engineering is the investigation of materials, products, structures or components that fail or do not operate or function as intended, causing personal injury or damage to property. The consequences of failure are dealt with by the law of product liability. The field also deals with...
- Sudden unintended accelerationSudden unintended accelerationSudden Unintended Acceleration is the unintended, unexpected, uncontrolled acceleration of a vehicle from a stationary position, low initial speed or at cruising speed, often accompanied by an apparent loss of braking effectiveness...
External links
- A Spy Under the Hood, Risk Management Magazine
- Heavy Vehicle EDR information site for EDR technology
- NHTSA EDR Site, which discusses EDR technology
- US Department of Transportation rulemaking for the EDR