Hyundai Tucson: Power Liftgate Module / Description and Operation

- Description Power liftgate is an electro-mechanical system designed to provide power opening and closing of the liftgate through the push of a button of a remote key (fob), console switch, inner switch or an outside handle switch of the liftgate.The power liftgate will reverse direction of travel if resistance to movement is detected while the liftgate is being opened or closed.Liftgate Position And Direction The PTG system will measure the Liftgate position via an integrated hall sensor inside the Spindle drive unit motor.The moving direction of liftgate will be detected by analyzing the direction of the drive unit motor.The hall sensor pulse counting (position detection) is active during power and manual operation mode.System Components

1.PTG Unit

PTG unit is located in rear left luggage side trim.PTG drive unit drive the two actuators (Spindles) by measuring the driving motors.PTG unit also controls anti trap functions by hall sensor analysis in the anti-pinch strip.

2.PTG Latch Assembly

Power latch is located in the lower part of lift gate panel.

3.PTG Spindle

PTG spindle open and close the liftgate by driving the motor.

4.SMK (Smart key)

Push the power liftgate open of the SMK more than 0.5s to open the power liftgate. Power Open operation shall be reversed when an additional Open/Close signal is received during power opening.

5.Liftgate inner switch

6.Liftgate buzzer

When a power operation cannot be performed as requested or an obstacle has been detected.

- Operation Power Liftgate Opening

** - Primary switch signal received by PTGM via CAN bus (sent by SJB)PTGM Opening procedure:

1.Opening can be triggered after a signal is received from, driver-console switch, outside handle switch, remote Key (FOB)

2.The latch will be released (by SJB) by actuation of latch motor.

3.On latch release, the liftgate latch pops out of the striker.

4.PTG module controls the liftgate motor in order to open the liftgate.

5.The rotating speed of the liftgate motor can be hall sensor that is built in the motor.

6.Opening angle of the liftgate is calculated by counting the input pulse signals from Hall sensor.

   

When the motor movement is restricted, the PTGM stops the liftgate motor movement due to obstacle detection.

Power Liftgate Closing

PTGM Closing procedure:

1.Closing can be triggered after receiving a signal from, console (driver) switch, ouside handle switch, remote key (FOB), inner switch

2.PTG module controls the liftgate motor in order to close the liftgate

3.Closing angle of the liftgate is calculated by counting the input pulse signlas from hall sensor

4.The rotating speed of the liftgate motor can be hall sensor that is built in the motor

5.The liftgate latch engages with the striker and the latch is locked mechanically (Latch unlock → Latch lock)

6.PTGM stops the liftgate motor operation after detecting the liftgate latch's secondary signal

7.On detecting the latch's secondary signal, the power close unit (PCU) starts the contract (cinch) operation and stops after the latch lock signal is detected

8.After contract operation is stopped, PCU is rewound until the PCU home position is reached

9.The liftgate is completely closed and latch is fully locked

Learned/Calculated/Programmed positions

1.Maximum Point for OpeningAbove this position a start in opening direction could make the liftgate move beyond the Maximum Basic Position and overload the mechanical system (hinges).Therefore the start of an opening action above this point is disabled.Anyway the liftgate moves beyond this point, if it has been started at a lower position.

2.Learned Mechanical End PositionThis is the mechanical block position while opening and is considered to be 100% opening. During the first liftgate opening this position is learned.After learning, the liftgate will not move beyond the Maximum Basic Position, which is defined by the Learned Mechanical Position – Security Distance.All positions are defined by parameters in the ECU or programmed by the user (Basic Programmed Position)

Programming the max. T/gate opening (Garage Position)

1.The customizable Programmed Basic Position is set equal to the Maximum Basic Position after the Learned Mechanical End Position is learned.

– The customer can change the Programmed Basic Position to any new position between the Maximum Point For Closing and the Maximum Basic Position.

– If the customer wants to set a new Programmed Basic Position below the actual Programmed Basic Position, he has to move the liftgate electrically or manually to the new position and has to push the Inner Switch for e.g. 3 seconds (time can be modified by parameter)

– If the customer wants to set a new Programmed Basic Position above the actual Programmed Basic Position he has to move the liftgate manually to the new position and has to push the Inner Switch for 5 seconds (time can be modified by parameter)

– If the user tries to program a liftgate position above the Maximum Basic Position, the ECU will set the Programmed Basic Position to the Maximum Basic Position.

System Parameterization Due to mechanical tolerances and adjustments in vehicle production and assembly the power operated liftgate needs calibration of the maximum movement range before proper operation can be ensured.The liftgate’s maximum movement range is represented by the number of Hall-pulses received by the ECU from the actuators’ speed / position sensors during a liftgate movement from the fully closed position (closure unit in fully latched position) to the upper end position limited by mechanical constraints (e.g. upper bump stops, spindle length or similar).Calibration Mode

Manual De-calibration Mode

Buzzer operation is defined in the following chart

	BUZZER	LAMP *)	Remark
T/gate start	2 times	2 times	When T/gate is triggered by Remote Contol or T/gate Console Switch
T/gate start	n.a.	n.a.	When T/gate is triggered by T/gate Inner Switch or T/gate Outer Handle Switch
T/gate stop	n.a.	n.a.
System error	3 Times	-	PCU/ Liftgate antiplay active, 0ver-/undervoltage condition, Endposition-/position error, spindle error, CAN error, Latch closed when Liftgate open
T/gate not closed	10 times	10 times	Latch Lock Switch not present
During Calibration run	Continuous ON-OFF beeping	n.a.	Activate buzzer but not C_PTHazard
Max. End Position learned	n.a.	2 times	Buzzer confirms learning finished
Max. End Position deleted	1 time	n.a.	Buzzer confirms "position deleted"
Car is moving with open T/gate	10 times	n.a.	T/gate open AND Speed >3km/h
Garage Position saved	2 times	n.a.	Buzzer confirms "New Garage Position"

*) Lamp will be synchronized by sending C_PTHazard simultaneously to Buzzer signal