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vehicle access and immobilizing electronic assembly

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vehicle access and immobilizing electronic assembly

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Model No:	vehicle access and immobilizing pcba

Country	CN
Payment Term	L/C

產品描述

automotive electronics vehicle access and immobilizing
systems modules pcba motherboards assembly electronics contract manufacturing
services OEM CEM EMS experience company-China Shenzhen Topscom

 
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automotive immobiliser security device Electronics OEM EMS CEM Contract Manufacturing PCBA Assembly Services:


An immobiliser or immobilizer is an
electronic security device fitted to an automobile that prevents the engine
from running unless the correct key (or other token) is present. This prevents
the car from being "hot wired" after entry has been achieved and thus
reduces motor vehicle theft.


The electric immobilizer/alarm system was
invented by St. George Evans and Edward Birkenbuel and patented in 1919. They
developed a 3x3 grid of double-contact switches on a panel mounted inside the
car so when the ignition switch was activated, current from the battery (or
magneto) went to the spark plugs allowing the engine to start, or immobilizing
the vehicle and sounding its horn. The system settings could be changed each
time the car was driven.[2] Modern immobiliser systems are automatic, meaning
the owner does not have to remember to activate it.


 


Immobilisers have been mandatory in all new
cars sold in Germany since 1 January 1998, in the United Kingdom since 1
October 1998, in Finland since 1998, in Australia since 2001 and in Canada
since 2007. Early models used a static code in the ignition key (or key fob)
which was recognised by an RFID loop around the lock barrel and checked against
the vehicle's engine control unit (ECU) for a match. If the code is unrecognised,
the ECU will not allow fuel to flow and ignition to take place. Later models
use rolling codes or advanced cryptography to defeat copying of the code from
the key or ECU.


 


The microcircuit inside the key is
activated by a small electromagnetic field which induces current to flow inside
the key body, which in turn broadcasts a unique binary code which is read by
the automobile's ECU. When the ECU determines that the coded key is both
current and valid, the ECU activates the fuel-injection sequence.


 


In some vehicles, attempts to use an
unauthorised or "non-sequenced" key cause the vehicle to activate a
timed no-start condition and in some highly advanced systems, even use
satellite or mobile phone communication to alert a security firm that an unauthorised
attempt was made to code a key.


 


Coincidentally, this information is often
recorded in modern automobile ECUs, which may record many other variables
including speed, temperature, driver weight, geographic location, throttle
position and yaw angle. This information can be used during insurance
investigations, warranty claims or technical troubleshooting.


 

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