Continental Automotive Systems Corporation KHFNA04 用户手册

Editor : 

KN.Kim 

Document name 

Project code 

Version: 

1.0 

Nov. 14. 2011 

ECO / DF No.

 

 

File: 

User Manual for KH_DM_Fob (공통).doc

 

Page 3 / 6 

 

 

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The System offers the following features: 
 

•  passive access for two doors, driver side and passenger side as well as trunk/tailgate 
•  passive start after interior detection of the SMART KEY FOB (without interior trunk and 

hat shelf detection) 

•  LF-RF communication (based on Siemens’ SMART KEY system) 
•  passive access trunk/tailgate via the trunk lid switch at the trunk 
•  max. 2 SMART KEY FOBs can be handled by the system 
•  communication to the engine management system via a single line interface 
•  communication to the ESCL via a single line interface 

 
 

 

The SMART KEY system is a system that allows the user to access and operate a 
vehicle in a very convenient way. To access the vehicle no traditional key or remote 
control unit is needed.  

The user carries a SMART KEY FOB which itself does not require any conscious 
actions by the user (e.g. operate a button).  

After being triggered the vehicle sends out a request in a limited range. If the 
SMART KEY FOB receives this request, it automatically sends a response to the 
vehicle. Then the system decides whether to perform a particular action (unlocking, 
locking…) or remain inactive. 

 
 

Electromagnetic waves are used to exchange information between the vehicle and the 
SMART KEY FOB. Both, vehicle and SMART KEY FOB are equipped with a transmitter, 
a receiver and several antennas.  
 
 

With this concept it is possible to have a set of interior antennas that covers the vehicle’s 
interior and a set of exterior antennas that covers the vehicle’s exterior. 
For an unambiguous separation between the vehicle’s interior and exterior it is sufficient 
that at least one area is covered exactly by the corresponding operating ranges of the 
antennas. 
 
The functions of the SMART KEY system have to be provided in a clearly defined and 
limited range. For the up-link from the vehicle to the SMART KEY FOB, a magnetic field 
with a frequency of 125 kHz and ASK modulation is used. Inductive antennas in and at 
the vehicle radiate the electromagnetic energy.