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Post by sandertsi on Apr 16, 2024 15:37:08 GMT
Hi,
When I decrease ACC set speed with 20 or 30 km/h using the minus button the car does it's best to reach the lower speed quite agressively by applying some braking.
Is this something that can be changed so it just goes off the throttle and let the speed 'bleed' off?
I don't have traffic light recognizion. Looking into the module for ACC I found an option called target braking, not sure if that's related and a bit hesitant to just try that without knowing what it does. Hoping anyone on here knows.
Thanks!
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Post by mathi9020010 on Apr 17, 2024 9:41:50 GMT
When your acc is properly coded, you have an option on the 5F Screen under "ACC", where you can pick the intensity of braking: the options are called: Eco, Normal and sport.
Option Eco is gonna break way more reserved than normal or sport. Vice versa your golf wont accelerate as fast in mode "eco" as in mode "sport".
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Post by sandertsi on Apr 17, 2024 18:32:48 GMT
Ah yes, I have four options on the MIB2 for how the ACC should be driving the car, currently set to normal:
Eco
Comfort
Normal *
Sport
Will give comfort and eco a try to see if it makes any difference in braking. Makes sense since it directly affects acceleration, the sport ACC mode takes of rather 'sporty' and eco is well, Bluemotion at its finest thinking a week ahead.
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Post by sandertsi on Apr 21, 2024 9:00:39 GMT
Well, changing ACC mode to comfort or eco only affected the acceleration. The braking to lower set speeds remains the same. Note: my Bluemotion lacks the driver profile options in MIB.
Any chances to change this directly in the module? I have Pro OBD2
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Post by dv52 (Australia) on Apr 21, 2024 22:21:21 GMT
Hi, When I decrease ACC set speed with 20 or 30 km/h using the minus button the car does it's best to reach the lower speed quite agressively by applying some braking. Is this something that can be changed so it just goes off the throttle and let the speed 'bleed' off? I don't have traffic light recognizion. hmm............. with absolutely no offense intended and as you doubtless have read in the owner's manual,"normal" ACC has a designed operating range of 30 km/h and 120 km/h. Yes, when activated - "normal" ACC with a set speed in the designed operating range will control the car to a standstill - but this situation is very different to using "normal" ACC outside it's designed parameters VW does make a version of ACC that has a designed operating range down to vehicle standstill - it's called Traffic Jam Assist. I've not tried using "normal" ACC down to these very low speeds, but I'm not surprised that the car is unhappy. I suspect the braking behavior that you have observed is deliberately designed to tell the driver that ACC is not a reliable, or safe facility to control the car at these low speeds !! Don |
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Post by sandertsi on Apr 22, 2024 22:19:55 GMT
Hi Don, no worries, no offense taken :-)
Let me explain: yes I know what the system is doing, keeping it's distance between the car in front of me within the 20-130km/h range and I have traffic jam assist taking care or the lower sub 30km/h regions which works flawlessly in stop and go traffic. Can't be happier with those features, they're awesome!
I never use ACC under 50km/h in normal driving, unless in stop 'n go traffic. And believe me I love how it applies the brakes for me in those conditions.
But my question is about driving with no one in front of the radar. Driving down a 80km/h road, entering a 50km/h zone. Clicking down minus 3 times 80>50 causes immediate braking, whereas I'd prefer the speed to bleed of naturally by just taking off the throttle like one would do while driving manually.
Thanks
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Post by dv52 (Australia) on Apr 22, 2024 22:56:06 GMT
sandertsi : Arrhh............. now I better understand your point - that's a very different situation to how I read your initial post! Here in the Antipodes when faced with the same situation, I brake the car's speed manually with the foot pedal. Yes, this has the impact of disabling ACC. My guess is that the behavior that you describe is simply the ACC functionality responding to your request to slow-down the set-speed - in this case, ACC thinks you want rapid decrease of "80>50" because the quick button presses is interpreted as the need for immediate braking.
I'm not sure that you will find a coding solution to this dynamic. Again my hunch is that the way to deal with these situations with ACC remaining activated is to slow-down the button presses (i.e. allowing ACC to respond between successive button presses)
Don
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Post by sandertsi on Apr 23, 2024 19:12:02 GMT
Glad that made my query more clear, sorry for the confusion.
And yes it's understandable the systems responds to asking it to slow down is to slow down accordingly. Was hoping you would know as you are such an expert on all of this 🙂
I do have 2 workarounds if you're interested:
1) Disconnect ACC with the button, set lower speed, use SET to re-engage: if you use freewheel coast, it will freewheel it's way to set speed and pick up from there.
2) Slightly depress the accelator to overrule the system, drop the set speed with the buttons and let your foot of the pedal. It will now stay in gear and let the speed bleed off naturally. This method just needs a little input on the accelator, when you see the size of the set speed in MFD go smaller you are overruling it already.
Benefit of these, if you have road conditions for it, is your ACC will stay on the prawl for vehicles slowing down ahead at a faster rate then you are cruising/bleeding speed.
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