HELLA and KGaA MQBBH Keyless Entry and Start System User Manual
Hella KGaA Hueck & Co. Keyless Entry and Start System
User manual
VW Kessy MQB-B ECU – Homologation
Author:
Dept.:
Daniel Siekmann
E-B-D2-HW1
Doc. name:
Process
Hardware Description
VW_Kessy MQB-B_011460-
20_Homologation_User_Manual
Doc.
version
1.0
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1/6
This document is confidential. Its contents are not to be exploited, passed on or disclosed to third parties without our express permission. All rights are reserved.
Hella 8303EN_GE (2004-09)
Table of Content
1
General Information ............................................................................................ 2
2
LF- Performance in Typical Application ............................................................ 3
2.1 LF Antenna Positions in Vehicle ............................................................................. 4
2.2 Authentication Ranges Inside and Outside the Vehicle ........................................... 5
3
Statement and Warning ...................................................................................... 6
VW Kessy MQB-B ECU – Homologation
Author:
Dept.:
Daniel Siekmann
E-B-D2-HW1
Doc. name:
Process
Hardware Description
VW_Kessy MQB-B_011460-
20_Homologation_User_Manual
Doc.
version
1.0
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2/6
This document is confidential. Its contents are not to be exploited, passed on or disclosed to third parties without our express permission. All rights are reserved.
Hella 8303EN_GE (2004-09)
1 General Information
In this document the Keyless Entry and Start System (Kessy) is introduced.
Keyless Entry Systems are the consequent development of well-known Remote Keyless Entry Systems
(RKE), the usage of the key fob with button pressing is still possible, but not necessary anymore to
enter the vehicle or to start it.
With the Hella Components UID, Door Handle Sensors, LF antennas and Keyless Entry ECU it’s
possible to equip a vehicle with only a few components and realize this very convenient and luxury
feature.
The Model Name of the described ECU is:
MQB-B H
VW Kessy MQB-B ECU – Homologation
Author:
Dept.:
Daniel Siekmann
E-B-D2-HW1
Doc. name:
Process
Hardware Description
VW_Kessy MQB-B_011460-
20_Homologation_User_Manual
Doc.
version
1.0
Page:
3/6
This document is confidential. Its contents are not to be exploited, passed on or disclosed to third parties without our express permission. All rights are reserved.
Hella 8303EN_GE (2004-09)
2 LF- Performance in Typical Application
In the Kessy (Keyless Entry and Start System) the Hella ECU is connected with Hella LF Antennas.
A UID – also manufactured from Hella – is to be found inside our outside the vehicle, whether a special
occasion happens.
Here are some examples:
- Passive Entry / Exit
A Person with the UID nears to the locked vehicle. If he grabs the door handle capacitive unlock sensor
is activated and the complete Keyless Entry Protocol is started:
The door handle antenna is transmitting LF data and a carrier signal, which can be recognized and
judged by quantity (RSSI-measurement) by the UID.
If the magnetic field strength is high enough (a certain border is reached) the UID stays “awake” for
additional LF communication by the other antennas driven sequentially.
The additional LF communication guaranties the functionality, that only the valid key OUTSIDE the
vehicle authenticates the system to unlock the car passively.
If the magnetic field strength is not high enough (e.g. the UID is too far away from the vehicle, the
border is not reached), the UID shuts down again and waits for the next LF Data. The vehicle is still
locked.
A Person with the UID is leaving the vehicle. If he touches the capacitive lock sensor at the door
handle, the complete Keyless Exit Protocol is started:
The door handle antenna is transmitting LF data and a carrier signal, which can be recognized and
judged by quantity (RSSI-measurement) by the UID.
If the magnetic field strength is high enough (a certain border is reached) the UID stays “awake” for
additional LF communication by the other antennas driven sequentially.
The additional LF communication guaranties the functionality, that only the valid key OUTSIDE the
vehicle authenticates the system lock the car passively. If the UID is left inside the car, the car won’t
lock.
If the magnetic field strength is not high enough (e.g. the UID is too far away from the vehicle, the
border is not reached), the UID shuts down again and waits for the next LF Data. The vehicle is still
open.
- Passive Start
A Person with the UID inside of the vehicle is pressing the Start-Stop-Switch. The Start-Stop-Switch
activates the complete Keyless Start protocol:
The interior antenna IN2 is transmitting the LF Data and a carrier signal, which can be recognized and
judged by quantity (RSSI-measurement) by the UID. The other two interior antennas IN1 and TRUNK
transmit two additional carrier signals sequential.
If the magnetic field strength of one of these transmits is high enough (a certain border is reached) then
the UID authenticates the system to start the vehicle.
If the magnetic field strength of all antenna transmits are too low (the field strength border is not
reached, maybe the UID is laying outside or is held 10cm outside the vehicle) the car won’t start.
VW Kessy MQB-B ECU – Homologation
Author:
Dept.:
Daniel Siekmann
E-B-D2-HW1
Doc. name:
Process
Hardware Description
VW_Kessy MQB-B_011460-
20_Homologation_User_Manual
Doc.
version
1.0
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This document is confidential. Its contents are not to be exploited, passed on or disclosed to third parties without our express permission. All rights are reserved.
Hella 8303EN_GE (2004-09)
2.1 LF Antenna Positions in Vehicle
Fig. 1 Antenna Positions at a Keyless Entry / Keyless Start Vehicle
Driver Door Handle Antenna Co-Driver Door Handle Antenna
Rear Outside Antenna
IN1
IN2
IN3
VW Kessy MQB-B ECU – Homologation
Author:
Dept.:
Daniel Siekmann
E-B-D2-HW1
Doc. name:
Process
Hardware Description
VW_Kessy MQB-B_011460-
20_Homologation_User_Manual
Doc.
version
1.0
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This document is confidential. Its contents are not to be exploited, passed on or disclosed to third parties without our express permission. All rights are reserved.
Hella 8303EN_GE (2004-09)
2.2 Authentication Ranges Inside and Outside the Vehicle
Fig. 2 Principle of Magnetic Field Detection Areas
Fig. 3 Cloud view of Rear-LF-Scan Fig. 4 Cloud View of Side-LF-Scan
outside detection
outside detection
inside detection
outside rear
detection
trunk
separation
approx. 180cm
approx. 180cm
VW Kessy MQB-B ECU – Homologation
Author:
Dept.:
Daniel Siekmann
E-B-D2-HW1
Doc. name:
Process
Hardware Description
VW_Kessy MQB-B_011460-
20_Homologation_User_Manual
Doc.
version
1.0
Page:
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This document is confidential. Its contents are not to be exploited, passed on or disclosed to third parties without our express permission. All rights are reserved.
Hella 8303EN_GE (2004-09)
Fig. 5 Principle of Field Strength Measurement in the UID
3 Statement and Warning
FCC statement
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two
conditions: (1) this device may not cause harmful interference, and (2) this
device must accept any
interference received, including interference that may cause undesired
operation.
Warning
Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s
authority to operate the equipment.