Hyundai Tucson: Button Engine Start System / Description and Operation

Description
System Overview
The System offers the following features:
-
Human machine interface through a 1-stage button, for terminal switching and engine start.
-
Control of external relays for ACC / IGN1 / IGN2 terminal switching and STARTER, without use of mechanical ignition switch.
-
Indication of vehicle status through LED or explicit messages on display.
-
Immobilizer function by LF transponder communication between fob and fob holder.
-
Redundant architecture for high system dependability .
-
Interface with Low Speed CAN vehicle communication network.
-
Interface with LIN vehicle communication network depending on platform .
The RKE and SMART KEY functions are not considered part of this Button Engine Start system and are specified in separated system.
System Main Function
-
Switching of ACC / IGN1 / IGN2 terminals.
-
Control of the STARTER relay BAT line (high side) based on communication with EMS ECU.
-
Management of the Immobilizer function.
-
Management of BES warning function.
Button Engine Start System
The Button Start System allows the driver to operate the vehicle by simply pressing a button (called as SSB) instead of using a standard mechanical key.
If the driver press the SSB while prerequisites on brakes, fob authentication and transmission status are satisfied, the BES System will proceed with the locking/unlocking of the steering column, the control of the terminal, and the cranking of the engine.
The driver can release the SSB as soon as this sequence initiated. After positive response from immobilizer interrogation, the system will activate the starter motor and communicate with the EMS to check the engine running status for starter release.
The driver will be able to stop the engine by a short push on the SSB if the vehicle is already in standstill. Emergency engine stop will be possible by a long press of the SSB or 3 consecutive presses in case the vehicle is in ENGINE RUNNING.
If the conditions for engine cranking are not satisfied while a push on the SSB is detected and a valid fob authenticated, the system will unlock the steering column and switch the terminals to IGN. Another push on the SSB will be necessary to start the engine.
In case of a vehicle equipped with SMART KEY system, fob authentication will not require any action from the driver. For limp home start or in case of vehicle without SMART KEY, the driver will have to insert the fob into the fob holder.

Control Ignition and engine ON/OFF by Sending signal to IPM and PDM.
Display status by LED Lamp ON/OFF. (Amber or Green)
Indicator ON/OFF Condition At Ignition Key Off Condition
No.
Character lamp
Conditions
1
Indicator Lamp ON
Door open, Tail lamp ON, ACC, IG ON
2
Indicator Lamp 30sec ON > Lamp OFF
Door close, Tail lamp OFF, IG OFF
3
Indicator Lamp OFF
Remote LOCK, Passive LOCK
4
Rheostat at tail lamp ON (Illumination lamp)

Indicator ON/OFF Condition According To Ignition Key's Position
No.
Ignition conditions
Start Button LED status
1
IG OFF
LED OFF
2
IG ACC
Amber color LED ON
3
IG ON (Engine OFF)
Green color LED ON
4
Cranking
Maintain LED status before cranking
5
Engine running
LED OFF

Wireless Communication
Electromagnetic waves are used to exchange information between the vehicle and the FOB. Two types of RKE Key can supplement the BES system:
-
Non-PIC RKE
-
SMART KEY FOB
Currently the BES system comprises with SMART KEY FOB always.
The transmitter, receiver and antennas required for the communication between the fob and the vehicle will differ depending on functionalities and regional areas.
The RKE and SMART KEY functions are in separated documents. Refer to Smart key system for more detailed information about SMART KEY function.
Smart Key

The SMK manages all function related to:
"Start Stop Button (SSB) monitoring",
"Immobilizer communication" (with Engine Management System unit for immobilizer release),
"Authentication server" (Validity of Transponder and in case of Smart Key option Passive Fob authentication ),
"System consistency monitoring",
"System diagnosis",
Control of display message / warning buzzer .
The unit behaves as Master role in the whole system.
In case of SMART KEY application, for example “Passive Access”, “Passive Locking” and “Passive Authorization are integrated for Terminal switching Operations”.
It collects information about vehicle status from other modules (vehicle speed, alarm status, driver door open...), reads the inputs (e.g. SSB, Capacitive Sensor / Lock Button, PARK position Switch), controls the outputs (e.g. exterior and interior antennas), and communicates with others devices via the CAN network as well as a single line interfaces.
The diagnosis and learning of the components of the BES System are also handled by the SMK.
Transponder

Terminal And Starter Relays
Relays will be used to switch the terminals ACC / IGN1 / IGN2. Those normally-open relays will be driven by the PDM and located either in the passenger or engine compartment depending on the vehicle architecture.
Only one relay coil is connected to the terminal outputs of the PDM.
Those relays should integrate a resistor connected in parallel to the coil in order to reduce the transients during commutation.
Start/Stop Button (SSB)
A single stage push button is used for the driver to operate the vehicle. Pressing this button allows:
To activate the power modes ‘Off’, ’Accessory’, ‘Ignition’ and 'Start' by switching the corresponding terminals
To start the engine
To stop the engine
The contact will be insured by a micro-switch and a backlighting is provided to highlight the marking of the button whenever necessary.
Two (2) LED colors are located in the center of the button to display of the status of the system. Another illumination LED is also integrated into the SSB for the lighting of the "Engine Start/Stop" characters.

Bes System State Chart
System STATES in LEARNT MODE
In learnt mode, the BES System can be set in 6 different sates, depending on the status of the terminals and Engine status:
System State
Terminal Status
Engine status
1. OFF - Locked
OFF
Stopped
2. OFF - Unlocked
OFF
Stopped
3. ACC
ACC
Stopped
4. IGN
IGN1, IGN2, ACC
Stopped
5. Start
IGN1, Start
Cranking
6. IGN - Engine
IGN1, IGN2, ACC
Running
(means "self-running")

Referring to the terminals, the system states described in the table above are same as those one found in a system based on a mechanical ignition switch.
The one of distinction with Mechanical-Ignition-Switch based system is that the BES system allows specific transition from [OFF] to [START] without going through [ACC] and [IGN] states.
System STATES IN VIRGIN MODE
The BES System can be set in 5 different states (OFF LOCKED is not available in virgin mode), depending on the status of the terminals and Engine status :
System State
Terminal Status
Engine status
1. OFF - UNLOCKED
OFF
Stopped
2. ACC
ACC
Stopped
3. IGN
IGN1, IGN2, ACC
Stopped
4. Start
IGN1, START with special pattern of activation see Chap 6.2.1 for details
Cranking
5. IGN - Engine
IGN1, IGN2, ACC
Running
(means "self-running")

Referring to the terminals, the system states described in the table above are same as those one found in a system based on a mechanical ignition switch. The one of distinction with Mechanical-Ignition-Switch based system is that the BES system allows specific transition from [OFF] to [START] without going through [ACC] and [IGN] states.
Schematic Diagrams
Circuit Diagram (1) ...

Start/Stop Button Components and Components Location
Component ...

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