• Feb 14th 2011 at 4:20PM
  • 7
Continental evSAT

Continental, an automotive parts supplier, has developed a satellite-linked sensor for plug-in autos that detects accidents and immediately cuts the vehicle's high-voltage battery current. This allows first responders to rescue injured drivers and passengers without the risk of suffering a potentially fatal electric shock.

The evSAT system consists of a triaxial sensor, which detects a frontal, rear or side collision, and a controller area network interface that receives a signal from the sensor and cuts battery power, if necessary, within half a second.

Dr. Axel Gesell, Continental's senior manager of platform development sensors and satellites, succinctly sums up the operation of the evSAT system like this:
The evSAT acceleration sensor is active in charge mode. It detects an accident and passes this information on to the battery management system which then shuts off the high-voltage battery. The major benefit of our product is that it prevents fire and rescue service personnel sustaining high-voltage injuries when coming into contact with vehicle metal parts or if they have to cut through the vehicle to recover accident victims.
Continental claims that evSAT can be installed in multiple locations within a vehicle, which allows it to be easily integrated into existing models without an extensive redesign. Continental will begin production of the evSAT system in 2012 and has reportedly signed a supply deal with an unnamed German automaker.

[Source: Continental]
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Continental enhances electric vehicle safety

The evSAT sensor detects accidents involving electric and plug-in hybrid vehicles and shuts off their high-voltage batteries.

Series production of the sensor will begin in 2012.


Frankfurt am Main, Germany. Continental, the international automotive supplier, has developed a sensor (satellite) for electric and plug-in hybrid vehicles which will immediately shut off the high-voltage battery in the event of a collision while the vehicle is in charge mode. This means that emergency service personnel can recover vehicles without running the risk of suffering an electric shock.

evSAT will immediately shut off the high-voltage battery in the event of a collision while the vehicle is in charge mode.

"The evSAT acceleration sensor is active in charge mode; it detects an accident and passes this information on to the battery management system which then shuts off the high-voltage battery", said Dr. Axel Gesell, Senior Manager Platform Development Sensors & Satellites, in the Passive Safety and ADAS business unit of Continental's Chassis & Safety Division. "The major benefit of our product is that it prevents fire and rescue service personnel sustaining high-voltage injuries when coming into contact with vehicle metal parts or if they have to cut through the vehicle to recover accident victims", Gesell added. Electric vehicles and plug-in hybrids are powered by high-voltage batteries of up to 400 volts. evSAT will go into series production with a major German vehicle manufacturer in 2012.

'evSAT' stands for 'Satellite for Electric Vehicles' and essentially consists of an independent, triaxial sensor with a CAN interface. During the charge phase, the other vehicle electronics, including the airbag system are not operational. So as to avoid the considerable expense of adapting the airbag system to meet new requirements, Continental has developed evSAT for the vehicle's charge mode. The accelerator sensor employs an algorithm to detect a frontal, rear or side collision with another vehicle and immediately transmits a signal via the CAN interface to the battery management system which then switches off the battery within half a second. evSAT reacts in the same way if it detects a rollover in driving mode. In this case, the battery is deactivated within four seconds at most. In the event of other types of driving accident, evSAT remains inactive. In such cases, the airbag system assumes the task of cutting off the battery. If the electric or plug-in hybrid vehicle has been switched off and is not being charged, the evSAT moves to a standby mode to prevent the battery discharging. As such, evSAT represents an additional passive safety system function for electric and plug-in hybrid vehicles.

Safety is important for ensuring a future for electromobility
Most high-voltage batteries in electric or plug-in hybrid vehicles generate a voltage of 400 volts, twice as great as the standard domestic plug socket and potentially fatal. Already, in the USA, there is a legal requirement for the vehicle power supply voltage to fall to below 60 volts within five seconds of an accident occurring. No such laws exist yet in Germany. "As electromobility continues to develop, the safety of electric vehicles will assume an increasingly important role. The need for technologies to meet future challenges is already demonstrated by the additional demand for evSAT from numerous other vehicle manufacturers", said Telmo Glaser, Continental's evSAT project manager.

evSAT sensors – possible applications and advantages
Essentially, evSAT can be installed in a number of different places in the vehicle; it should, however, be placed sufficiently well inside the vehicle (beneath the front passenger seat, for example) to avoid being damaged in an accident. The advantages of using evSAT are that there is no need for the conventionally powered vehicle variants within a model series to be modified. evSAT can be integrated into the existing systems of electrically powered vehicle variants without redesign work. This benefit also increases flexibility as regards installation space, customer-specific requirements and development time. Savings can be made due to lower system development costs and by avoiding placing greater demands on the airbag system. The sensors will be produced, starting this year, in Continental's Regensburg plant.


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    • 1 Second Ago
  • 7 Comments
      • 4 Years Ago
      This is beyond stupid. Hack Skynet and instantly pull power to all vehicles. Sounds safe.

      Seriousy, if you must worry the first responders into thinking that EV's have more danger potential than gas vehicles, add an idenfying mark to all such vehicles. Give them some line workers rubber gloves and call it a day.

      Battery management units will already cut power if there's a short before the batteries already. If they think this system will overcome batteries that are split in half, they're wrong.
      • 4 Years Ago
      The illustration of the car at the filling/charging station reminds me - there are lots of people who drive away from gas pumps with the filler nozzle in. What happens when someone drives off with the power cable in? Can a charging station detect an accident of this type and shut off power before it shorts and sparks all over?
      • 4 Years Ago
      I would have expected something like this for all EV's and Hybrids.
        • 4 Years Ago
        Tis is required by law in Germany.
        It is nothing new :D
      • 4 Years Ago
      Airbag goes off, battery switched off. How hard is that?
        • 4 Years Ago
        Exactly. Why bother with a complex and expensive satellite link when it could be done cheaper and more reliably on-board the car.

        Now a satellite link to alert authorities to a serious accident is a worth considering, though a cell based system like OnStar would be less expensive.
      • 4 Years Ago
      BTW, the auto industry has been selling this myth about the dangers of EVs to first responders, and insurance agents for years. Dirty tactic to pretend to care about someone's safety, when you're really trying to instill a deep fear that electricity is scary.