ACC and TJA - Quirks or Features

[Ozsko]

All right.. I have had my MY18 Tiguan Highline (DAP+ RLine) for over 2 months now. Absolute joy to drive and very happy with it... with one exception.
The cruise control+ TJA ....
On highways when vehicles slow down and roll forward, it works like a treat and I use it all the time.
But on normal roads (Speed limits 60 or 70) with traffic signals is where I am seeing some weird behaviour (I do not think TJA is built for this scenario, but want to check if others have similar issues).
Lets say I am rolling (ACC Active) on at 60KPH on the road and a about 400mts down there is a signal and there is a single car there. No cars are there between mine and the one at the signal. The car at the signal is at a completed stop.
Now... as my car nears it I find that:
a) The car does not slow down and down right does not register the existence of the car at the signal.
b) When I apply the brakes and come to a complete stop and re-engage the ACC, it immediately recognizes the car in front of me
c) This is never the case for a car moving at say 40 KPH and coming to a stop in front of me.

Am I missing something here? Isn't the radar always looking when ACC is active?

@Moderators - Please let me know if this is not the right post for the query.

That is the correct behaviour, read the manual, mine states it will not react to a stopped vehicle, our Golf is the same. Mine does not react to vehicles in the right lane but then my TJA was not a factory activation so apples and oranges maybe? In fact TJA is not necessary for the stop/go part as all TJA does is add steering guidance under 67kph, end of story.

[zzc2010]

ACC and TJA do not recognize the car at the front in higher speed!

That is why your hands are on the wheel. Remember to break all the time when necessary. There is no autonomous driving are yet.

Volkswagens only have 1 radar sensor but Audis have 3 sensors so Audis do ACC and TJA much better.

Your Tiguan is still a nice car and you are asking for a feature that your car just can not do it.

[spacemannz]

TJA seems to be engineered specifically for use in queues on motorways. It does not handle urban driving with cross traffic, turning traffic and intersections very well.

Autonomy is not there yet. I can’t talk to my Tiggy through my Apple Watch... and it can’t even let me out in the driveway and then park itself in the garage. Turbo boost does not jump me over obstacles and Siri simply doesn’t get my Kiwi accent. I miss KITT.

[subbi]

VW cut corners here

[subbi]

TJA seems to be engineered specifically for use in queues on motorways. It does not handle urban driving with cross traffic, turning traffic and intersections very well.

Autonomy is not there yet. I can’t talk to my Tiggy through my Apple Watch... and it can’t even let me out in the driveway and then park itself in the garage. Turbo boost does not jump me over obstacles and Siri simply doesn’t get my Kiwi accent. I miss KITT.

Agree, works well in tight peak hour traffic in the city. Crossing a signal takes half an hour on some bad days. ACC + TJA Just makes it easier till the point you near the signal.. at that point you take over

[tigger73]

Agree, works well in tight peak hour traffic in the city. Crossing a signal takes half an hour on some bad days. ACC + TJA Just makes it easier till the point you near the signal.. at that point you take over

Like I said earlier you work out how the sytem works, what it does well and when you need to take over from the "semi-autonomous" driving.

Some of the systems work better than others and there's plusses/minuses for cameras versus radar sytems (which continue to operate in heavy rain / fog).

One thing to say is that the new generation of ACC systems are a big step forwards compared to the "old" cruise control.

[ArdiL]

Just thinking about ALG activating at 67 km/h.
Would there not be a piece of code that contained the value 67 to activate ALG?
And if so, we replaced 67 with say 30 then we could have ALG (TJA) whatever, activated at a lower speed?

Wishful thinking maybe (on a hot summers day)

[zzc2010]

Just thinking about ALG activating at 67 km/h.
Would there not be a piece of code that contained the value 67 to activate ALG?
And if so, we replaced 67 with say 30 then we could have ALG (TJA) whatever, activated at a lower speed?

Wishful thinking maybe (on a hot summers day)

No values to be changed.

All the module functions are enabled by parameters.

[tigger73]

It would have to be a parameter stored somewhere. Perhaps in the adaptation area???


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[Jap]

Front assist module

Control unit: A5 Front Sensors Driver Assistance System
System description: MQB_B_MFK
Software number: 3Q0980654G
Software version: 0231
Hardware number: 3Q0980654
Hardware version: H06
Serial number: 22011712P21805
ODX name: EV_MFKBoschMQBB
ODX version: 001001
Backup name: park
Long coding:
000307000000040100022355C050A90098000E300040
Adaptations:
Road sign detection fusion mode:
Road sign fusion
Adaptation_tsr:
Par_country_mode:
Automatic
Par_relevance_mode:
enabled
Par_country_code_RSR:
0
Par_country_code_VZF:
0
Deactivate production mode:
Deactivating
Calibration target position:
Target 1, calibration mark 1, x-coordinate:
2565 mm
Target 1, calibration mark 1, y-coordinate:
825 mm
Target 1, calibration mark 1, z-coordinate:
1530 mm
Target 1, calibration mark 2, x-coordinate:
2565 mm
Target 1, calibration mark 2, y-coordinate:
-825 mm
Target 1, calibration mark 2, z-coordinate:
1530 mm
Target 1, calibration mark 3, x-coordinate:
2565 mm
Target 1, calibration mark 3, y-coordinate:
825 mm
Target 1, calibration mark 3, z-coordinate:
870 mm
Target 1, calibration mark 4, x-coordinate:
2565 mm
Target 1, calibration mark 4, y-coordinate:
-825 mm
Target 1, calibration mark 4, z-coordinate:
870 mm
BAP personalization:
activated
Body height wheel house edge:
Body height left front wheel house edge:
673 mm
Body height right front wheel house edge:
675 mm
Body height left rear wheel house edge:
673 mm
Body height right rear wheel house edge:
674 mm
Direct. stab. assist speed threshold during towing mode:
300 km/h
System mode, lane depart. warn,:
Steering wheel vibration not active
standstill_mode:
Not activated
Warning intensity, lane depart. warning:
Medium
Activating and deactivating all development messages:
Activation_of_development_messages_reserved:
Not activated
Activation_of_development_messages_lane:
Not activated
Activation_of_development_messages_WLA:
Not activated
Activation_of_development_messages_VZF/TSR:
Not activated
Activation_of_development_messages_EHR:
Not activated
Activation_of_development_messages_HCA_lane:
Not activated
Activation_of_development_messages_HCA_state:
Not activated
Activation_of_development_messages_internal:
Not activated
Xcp_interface:
Not activated
Mask_error_reactions_for_development:
Not activated
Initial calibration, result:
Pitch angle:
1.020 °
Yaw angle:
-0.155 °
Roll angle:
-0.020 °
Camera height:
1319 mm
Production mode:
Deactivating
Roller test bench mode, functional:
Not activated
Personalization of intervention moment at T. 15 on:
Last setting
Distance to calibration field:
1500 mm
Axle offset:
Front axle transverse position:
7 mm
Rear axle transverse position:
-0 mm
Switch-on condition, lane depart. warn.:
on (setting via menu)
Masked_fault_classes:
255
255
255
255
WLA_adjustment:
BrightnessThreshold_active:
0
BrightnessThreshold_passive:
0