Editor : KK Ko Document name Project code
Version: 0.5 Aug. 10. 2006
ECO / DF No.
Identification No. : Document No.
File: 01 User Manual for SMK ECU_revised Page 4 / 10
.
Proprietary data, company confidential. All rights reserved.
Confié à titre de secret d'entreprise. Tous droits réservés.
Comunicado como segredo empresarial. Reservados todos os direitos.
Confidado como secreto industrial. Nos reservamos todos los derechos.
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Weitergabe sowie Vervielfältigung dieser Unterlage, Ver
pflichten zu Schadenersatz. Alle Rechte vorbehalten, insbe-
sondere für den Fall der Patenterteilung oder GM-Eintragung
1. Smart Key System configuration
The System offers the following features:
•passive access for driver side and passenger side door as well as trunk/tailgate
•passive start after interior detection of the SMART KEY FOB (without trunk interior and
hat shelf detection)
•max. 2 SMART KEY FOBs can be handled by the system
•immobilizer backup antenna driver integrated into MSCL(MSCL system) or FOB
holder(ESCL system)
•communication to the engine management system via a single line interface
The SMART KEY system is a system that allows the user to access a vehicle and start a
engine in a very convenient way. To access the vehicle, traditional key or remote control unit
operating is needless. To start engine, tranditional key inserting, and then rotating procedure
is needless.
The user carries a SMART KEY FOB which itself does not require any conscious actions
by the user (e.g. press a Key button). The SMART KEY system is triggered by pressing a
door handle push button or only grabbing.
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.
In a similar manner, the vehicle’s Mechatronic Steering Colume Lock (MSCL) or Electirc
Steering Colume Lock(ESCL) is released. Before this, a communication between the
SmartKey ECU and the SMART KEY FOB is needed.
1.1 Wireless Communication
Electromagnetic waves are used to exchange information between the SmartKey ECU
and the SMART KEY FOB. LF transmitter(125kHz) is equipped in SmartKey ECU, RF
receiver(433Mhz) is equipped in SmartKey SRx, and LF receiver and RF transmitter are
equipped in SmartKey FOB, For LF transmission, a magnetic field with a frequency of
125 kHz and ASK modulation is used. And for RF transmission, 433MHz frequesncy is
used.
1.2 Wireless concept Description
In SmartKey system, LF and RF signal is used for communication between SmartKey
FOB and Vehicle. 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.
