User's Manual

ManualsBrandsContinental Automotive Systems ManualsElectronicsSmart key Fob

Editor : KK Ko Document name Project code

ECO / DF No.

Version: 0.1 Jun. 07. 2007

File: User Manual for BH_HM_Fob

Identification No. : Document No.

Page 3 / 6

Comunicado como segredo empresarial. Reservados todos os direitos.

Confidado como secreto industrial. Nos reservamos todos los derechos.

Weitergabe sowie Vervielfältigung dieser Unterlage, Ver

wertung und Mitteilung ihres Inhalts nicht gestattet, soweit

nicht ausdrücklich zugestanden. Zuwiderhandlungen ver

sondere für den Fall der Patenterteilung oder GM-Eintragung

1. System configulation

1.1 Scope of SMART KEY SYSTEM

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

1.2 Short description of the SYSTEM

1.2.1 General Definition of SMART KEY

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.

1.2.2 Wireless Communication

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.

1.2.3 Concept Description

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.