Has anyone enabled Traffic Jam Assistant on an Octavia MkIII that already has Adaptive Cruise Control and Adaptive Lane Guidance (active lane keeping)?

Per https://forum.obdeleven.com/thread/2069/traffic-jam-assistant-coding-obdeleven#ixzz5eXHsmx4n (this thread is about the Audi Q5) and https://forum.obdeleven.com/thread/6873/activate-traffic-jam-assist-emergency (this thread is specifically about the Tiguan MkII 5N) it looks like the hardware of ACC and ALG should be enough, assuming that TJA is NOT extra software that isn't already installed.

Anyone know if TJA is in fact extra software/ what to look for (I have an OBDeleven) to see if all the bits are present and it's just a matter of enabling it via long coding and/or adaptations?

thanks!

 

Hm, I am not an expert, but I think the electromechanical parking brake might be a requirement for this. I would be glad to have those systems in my car as well, but I have an experience just from the vehicles equipped with EPB.

Hi, thanks for the idea. I'm not sure why the parking brake would be involved in the Traffic Jam Assistant, since only the regular brake (which Adaptive Cruise Control, Pedestrian/crossing traffic/ Collision avoidance, etc all use) is how a car/driver in traffic slow and even temporarily stops a car in stop-and-go traffic?

  

4 hours ago, misor1994 said:

Hm, I am not an expert, but I think the electromechanical parking brake might be a requirement for this. I would be glad to have those systems in my car as well, but I have an experience just from the vehicles equipped with EPB.

 

I also think the EPB is necessary for TJA to work. Why?

 

Because when the vehicle is stationary in a traffic jam TJA needs to be able to apply the 'parking' brake otherwise the car will either creep if left in gear with the clutch engaged or will roll if the clutch is disengaged, and hence needs the EPB.

Edited 14 February, 20215 yr by PetrolDave

Um. Why would the car creep forward? (You mention a clutch; I have a DSG7 automatic transmission; the car is capable of autonomously braking to a complete stop to avoid a collision. If it can "press" the brake that hard, why could it "keep the brake pressed" until traffic in front clears to allow TJA to move forward again?)

Also, per https://www.briskoda.net/forums/topic/454210-electric-parking-brake/ I don't get the impression that the Octavia MkIII even comes with an electronic parking brake option? (I think the MkIV moved to that).

-Jay

 

 

I'm pretty sure my DSG ACC hands back control if it comes to a complete stop in traffic - it warns you to apply brake manually, then switches off after a couple of seconds. This is meant to be because of the manual hand brake in the Octavia, whereas models with EPB will apply it and then release & resume ACC after a complete stop of any duration.

 

I wouldn't be surprised to learn that TJA will therefore require EPB.

4 hours ago, JayLibove said:

Um. Why would the car creep forward? (You mention a clutch; I have a DSG7 automatic transmission; the car is capable of autonomously braking to a complete stop to avoid a collision. If it can "press" the brake that hard, why could it "keep the brake pressed" until traffic in front clears to allow TJA to move forward again?)

Also, per https://www.briskoda.net/forums/topic/454210-electric-parking-brake/ I don't get the impression that the Octavia MkIII even comes with an electronic parking brake option? (I think the MkIV moved to that).

-Jay

The hydraulic brake is only held on for a few seconds after the vehicle comes to a halt, for TJA to work it needs the EPB to apply the non-hydraulic rear brakes.

 

Yes the Octavia III does NOT have EPB hence TJA is impossible on an Octavia III, but is possible on the Golf 7 & 7.5 and Octavia IV which DO have EPB.

I stand corrected.

I'd been sure that I'd seen TJA as an option in the Octavia MkIII / 2020 model year .. but looking back now, TJA was introduced in the MkIV for the 2021 model year that had been announced in 2020.

Thanks everyone. (Fortunately, I almost never have to drive through traffic anyway; it was just a cool thought...)

 

Deleted 

Edited 15 February, 20215 yr by FrankNicklin

Hi guys,

 

I can tell you for sure, that TJA is possible to retrofit on Octavia. On my Octavia I was able to successfully retrofit.

You just need to specific front camera and to have ACC. 

Possible camera:
HW: 3Q0 980 654 without index or with index A (or 3QD 980 654) H06+

ACC radar can be the old one, newer one, doesn't meter. I had 5Q0 radar and now I have 3QF radar, worked with both.

 

The only requirement for TJA is the front camera and ACC, nothing else

I just have ABS, which doesn't support ACC with Follow-to-Stop and it is also working. I have DSG.

The only problem with this ABS is, that below 20 km/h the ACC stop working -> TJA too, because you need to have ACC activated to use TJA function.

 

Hi @Krosta, by coincidence I was thinking about this same thing at about the same time.

I suppose it's not "officially" "Traffic Jam Assist" if it can't really bring the car to a stop, but in practical terms for low speed (but not stop-and-go) traffic it's still quite useful.

I think I've noticed that the ACC in my car actually does work below 60km/hr (which I understand is the speed below which ACC supposedly stops working).

What I need to do is to get a friend out in their car in front of me to test this in a no-traffic situation, as I obviously don't want to do so in uncontrolled conditions.... heheh.

Did you have to change any adaptations or long coding, or does your vehicle just do this as part of ACC?

cheers,

 

27 minutes ago, JayLibove said:

I suppose it's not "officially" "Traffic Jam Assist" if it can't really bring the car to a stop

It either is or isn't TJA - and since it can't bring the car to a halt and restart it when the queue moves then it's NOT TJA.

 

That doesn't mean it isn't useful, but to call it TJA is misleading.

1 hour ago, JayLibove said:

Did you have to change any adaptations or long coding, or does your vehicle just do this as part of ACC?

I wrote a new parametrization, which was called "mit STA", which means in english "with TJA". I didn't do anything else, it is not coding, not adaptations.

 

1 hour ago, PetrolDave said:

That doesn't mean it isn't useful, but to call it TJA is misleading.

I called it TJA, because to activated this function, I needed to do the parametrization for TJA into A5 modul.

 

Like I wrote, this is not the correct setup for TJA, because normally you get TJA only with ACC, EPB and front camera. I was able to get it to work without it. I can't benefit from this as much as others, who have in car EPB or correct ABS atleast for Follow-to-Stop function. 

I still don't think, that saying, that this is TJA is misleading information, just like I wrote in my comment before, I just can't benefit from all function, that TJA has. Activation process was the same like doing TJA therefore I saying, that this is TJA.

 

Also for example, in this video he told, that below 60 km/h, TJA starts functioning. 

In other words - If your car can keep in lanes below 60 km/h, it is TJA. This is what I thinking.

 

I am not saying, that what you are saying is wrong, just that I don't think, that I am saying something wrong

 

Hi @Krosta, I apologise if I'm being dense. You mention that you wrote a new "parametrization". I'm familiar only with the way that the OBDeleven works, which gives access to flipping some bits (which ODBeleven calls "long coding"; which does not mean writing/ changing/ or uploading program code, just flipping bits), as well as to adaptations (and some basic settings resets).

So, what do you mean when you say parametrization?

thanks,

Jay

  

1 hour ago, Krosta said:

I wrote a new parametrization, which was called "mit STA", which means in english "with TJA". I didn't do anything else, it is not coding, not adaptations.

 

 

Plenty of modules now have a dataset as well as coding and adaptations. Some features are only possible to enable if it's present in the dataset.

 

Parametrisation is the process of uploading a new dataset. This is not something that VCDS or OBDeleven support.

 

You'll either need ODIS or VCP with appropriate dongles

Yeah, correct, like langers2k wrote, you need VCP/ODIS for this and it is file, that needs to be "flashed/uploaded" to the unit. You can't change this only by doing long coding or adaptations

Aha. Bugger. 

thanks,

  

6 minutes ago, Krosta said:

Yeah, correct, like langers2k wrote, you need VCP/ODIS for this and it is file, that needs to be "flashed/uploaded" to the unit. You can't change this only by doing long coding or adaptations