Continental Automotive Systems Corporation SMK Manual De Usuario
Editor :
KK Ko
Document name
Project code
ECO / DF No.
Version:
0.5
Aug. 10. 2006
File: User Manual for SMK ECU_revised
Identification No. : Document No.
Page 5 / 5
.
ropri
e
ta
ry
dat
a,
c
o
m
p
any
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ident
ia
l.
A
ll
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ight
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.
onf
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à
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itr
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ous
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.
o
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ado
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itergabe s
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V
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M
itt
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Inhal
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ta
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-E
in
tr
agung
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.
Technical aspects of 125 kHz – magnetic field:
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.
Technical aspects of 125 kHz – magnetic field:
• virtually no reflections,
• cubical decrease of field strength → allows good range control,
• released frequency band (ISM),
• high
• cubical decrease of field strength → allows good range control,
• released frequency band (ISM),
• high
penetration,
• low quiescent current demand due to 125 kHz input stage (SMART KEY FOB),
• less sensitive for detuning compared to higher frequency.
• less sensitive for detuning compared to higher frequency.
For the down-link from the SMART KEY FOB to the vehicle, the standard radio frequency
(RF) is used (similar to the classic remote control functions) with FSK modulation.
1.2.4 System
Architecture
The system is designed as an optional system, making it possible to equip vehicles of the
same car-Line with different levels of access control systems.
same car-Line with different levels of access control systems.
The system is suitable to be integrated into an existing architecture that provides central
locking functions with standard remote control. This proposal assumes that the following
functions / devices are already present in the vehicle’s architecture.
• Central locking system (latch / motor – drivers etc.)
• Standard body control functions
• Warning
locking functions with standard remote control. This proposal assumes that the following
functions / devices are already present in the vehicle’s architecture.
• Central locking system (latch / motor – drivers etc.)
• Standard body control functions
• Warning
buzzer