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Quick Stops and Adaptive Cruise Control


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27 replies to this topic

#1 OFFLINE   AlphaDecay

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Posted 11 March 2015 - 12:35 PM

Has anyone had a situation where the ACC had to stop the car quickly? There was a discussion about a WRX driver (that is now being charged for their driving) and the WRX had "brake checked" a Lexus driver that was close behind them (the WRX driver had done other things to create that situation from my understanding).  Anyway, my friend's comment was that he was surprised at how well the automatic braking of the Lexus worked (he assumed it was that feature due to the distance and speed of response).  Has anyone been in the bad spot where the ACC had to stop or brake check? I've never had that issue but it does make me wonder how well it would work.  Here's the related youtube of the WRX/Lexus: https://www.youtube....h?v=2Ea2Au13EVY


Edited by AlphaDecay, 11 March 2015 - 12:36 PM.








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#2 OFFLINE   acdii

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Posted 11 March 2015 - 12:49 PM

The car will slow down, how much depends on the situation, but it will not stop! It disengages at 25 MPH.  What it does do, and is annoying is if a car moves to a turn lane and slows, the ACC grabs onto that car and will slow you down even though it is no longer in your lane.  Only if the car in front has moved completely out of the line of sight of the radar and then slow will the ACC ignore it. In this situation, something like what you described could be interpreted as a brake check by someone behind you. Subaru now has the autobrake which WILL stop the car on it's own, but only if another car directly in front of it has stopped. 


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#3 OFFLINE   jeffo65

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Posted 11 March 2015 - 01:06 PM

The car will slow down, how much depends on the situation, but it will not stop! It disengages at 25 MPH.  What it does do, and is annoying is if a car moves to a turn lane and slows, the ACC grabs onto that car and will slow you down even though it is no longer in your lane.  Only if the car in front has moved completely out of the line of sight of the radar and then slow will the ACC ignore it. In this situation, something like what you described could be interpreted as a brake check by someone behind you. Subaru now has the autobrake which WILL stop the car on it's own, but only if another car directly in front of it has stopped. 

 

I just replaced my Xterra with a 2015 Subaru XV Crosstrek with the Eyesight system.  I got spoiled with the ACC on the FFH and wanted it on my vehicle.

 

I was told by the dealer that Subaru "Eyesight" will assist in the stopping when the vehicle is traveling at a slow speed.  I believe it is 30 mph.  If you are going faster than that you will get the warnings and adjusted speeds as the FFH does during ACC.

 

Maybe I need to test it out. :) 

 

.


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#4 OFFLINE   AlphaDecay

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Posted 11 March 2015 - 01:20 PM

What it does do, and is annoying is if a car moves to a turn lane and slows, the ACC grabs onto that car and will slow you down even though it is no longer in your lane. 

 

That part drives me nuts on freeway exits - I've even adjusted to just going to the left lane so I don't get nabbed by people exiting and slowing.  I know that ACC won't stop, but I was just wondering how hard it would brake (say from 70 down to 40 or something).  The collision warning sensor thing is another added precaution, which is nice.  I'm quite happy with all of the driving aids and am actually looking forward to my now driving age daughter using the car (especially with the MyKey stuff).

 

 

I just replaced my Xterra with a 2015 Subaru XV Crosstrek with the Eyesight system.  I got spoiled with the ACC on the FFH and wanted it on my vehicle.

 

I can't stand driving my wife's van and when we replace it, the new car will have a similar feature.  Out here in Montana there is just too much road distance to not have ACC-like features.  Now I just need a replacement that is a hybrid, AWD, increased ride height (like a crossover) and ability to light-duty tow (golf cart on a trailer kind of thing).


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#5 OFFLINE   jeffo65

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Posted 11 March 2015 - 01:25 PM

Even if the cars did auto stop, I am not sure I would fully trust them to do it by itself.  I am not ready for a self-drive vehicle.

 

 

 

I can't stand driving my wife's van and when we replace it, the new car will have a similar feature.  Out here in Montana there is just too much road distance to not have ACC-like features.  Now I just need a replacement that is a hybrid, AWD, increased ride height (like a crossover) and ability to light-duty tow (golf cart on a trailer kind of thing).

These reasons are why I looked at the Subaru Crosstrek.  I wanted something that would get good gas mileage, be able to carry my bikes, be able to carry the kayaks and tow a small trailer when needed and have increased ride height.

 

This vehicle served all those things.  I passed on the Hybrid because the difference in mpgs was not significant enough.


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#6 OFFLINE   md13ffhguy

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Posted 11 March 2015 - 04:47 PM

The car will slow down, how much depends on the situation, but it will not stop! It disengages at 25 MPH.

Actually, it disengages right around 12 MPH. However, it can't be set until you reach 20 MPH.

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#7 OFFLINE   acdii

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Posted 11 March 2015 - 05:33 PM

Actually, it disengages right around 12 MPH. However, it can't be set until you reach 20 MPH.

MKT is different then, thought the Fusion would be similar. The T engages at 25 MPH, but I never attempted to see where the ACC would quit, not about to either. 


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#8 OFFLINE   md13ffhguy

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Posted 11 March 2015 - 07:10 PM

MKT is different then, thought the Fusion would be similar. The T engages at 25 MPH, but I never attempted to see where the ACC would quit, not about to either. 

Unfortunately, my commute frequently involves speeds fluctuating between 10 and 25... in a 55 zone. This morning, I probably drove for a good 3 miles under 25, but over 12, with the ACC set at 1 bar, which made the whole experience slightly less frustrating.
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#9 OFFLINE   murphy

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Posted 11 March 2015 - 07:14 PM

At about 20 mph, as the traffic is slowing down, there is a "ding" and the ACC shuts off.



#10 OFFLINE   md13ffhguy

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Posted 11 March 2015 - 07:24 PM

At about 20 mph, as the traffic is slowing down, there is a "ding" and the ACC shuts off.

The manual, and my actual experience, indicate that this occurs at 12 MPH.

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#11 OFFLINE   Waldo

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Posted 12 March 2015 - 11:00 AM

MKT is different then, thought the Fusion would be similar. The T engages at 25 MPH, but I never attempted to see where the ACC would quit, not about to either. 

 

Why not, I do this 3-4 times a day.  Very uneventful.

 

The Fusion will disengage at 12mph but the MKT will disengage at 18mph.



#12 OFFLINE   acdii

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Posted 12 March 2015 - 10:11 PM

Not going to worry about the MKT anymore, I traded it off this evening for a Focus for my wife. My Freestyle should suffice for now for what I used the MKT for, just without all the toys and "style".  The Fusion has almost everything the MKT had, except the adaptive HID headlights and suspension, oh and heated steering wheel, and cooled seats, which really weren't, the heated seats in the Fusion are so much better than they were in the T. 


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#13 OFFLINE   dlubin

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Posted 05 April 2015 - 11:05 PM

I have been pleased with the performance of the ACC except for one thing.  It appears to be overly sensitive to bicycle riders, even if they are far off on the shoulder.  When I come up on a bicycle, I often have to hit the gas pedal to keep the car from slowing down.  Perhaps the guy who designed the system was an avid cyclist, and wanted to make a statement!


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#14 OFFLINE   Riggo

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Posted 17 January 2016 - 01:10 AM

I've seen that the latest update to Tesla's car allows the car to accelerate, steer, and come to a stop without any input from the driver.
I am wondering why something like this can't be done to those of us who have ACC and park assist in our cars. It seems if the Fusion can slow down and speed up already, a software update to bring it to a complete stop if need be isn't a big deal. And since park assist can steer the car and lane departure brings the car back in the lane already, it could be updated to steer completely and keep the car in the lane.
Come on Ford, hook us up! 😀

#15 OFFLINE   lolder

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Posted 17 January 2016 - 07:04 AM

These functions take a lot of software, computer power and memory and the present cars may not have that. This coming earthquake is about more than self driving cars and some companies may be swamped by the tsunami. Many of them are in a panic trying to catch up. Self driving cars are already here in the Tesla S and to a lesser extent some Volvos, Subarus and some European makes. These are not yet autonomous driverless cars. Google is way ahead in the autonomous software and Tesla is accumulating a million miles of driving data per day in it's fleet of 40,000+ Model S's equipped with the "Autopilot". A recent Tesla software update 7.1 enables the S to be summoned ( on private property ) from it's parking location to you without a driver. It will open a garage door, exit, close the door and drive to you. Those who say these technologies will be here by 2020 or 2025 are going to be left in the dust.


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#16 OFFLINE   murphy

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Posted 17 January 2016 - 07:52 AM

My 2013 Fusion does not have the capability to apply the brakes automatically other than the regen braking which can't stop the car.  It pre-charges the brake system and activates an audio and visible warning when it detects a possible collision so that when the driver hits the brake pedal maximum braking is immediately available.  It has triggered many times when there is no danger such as the car in front turning out of the lane.  The lane following capability is not even close to being good enough to automatically steer the car.  I've tried and it wanders back and forth from lane edge to lane edge like a drunken driver.  Fortunately it defaults to off in a 2013.  I almost never turn it on.



#17 OFFLINE   talmy

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Posted 17 January 2016 - 09:55 AM

My son has a Tesla (without the self driving features) but had a loaner with those features while his was undergoing routine maintenance. I got to ride in it. It isn't perfect -- it will follow the car ahead into turn lanes rather than keep going straight. It does wander a bit and isn't smooth with speed control (although it is capable of coming to a complete stop if the car ahead stops). I found it drives much like a new driver would. Maybe as the system matures it will get better!.


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#18 OFFLINE   hybridbear

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Posted 18 January 2016 - 02:22 PM

My 2013 Fusion does not have the capability to apply the brakes automatically other than the regen braking which can't stop the car.

I didn't realize that Adaptive Cruise Control can only use regen to slow the car. I thought it also used the friction brakes as needed.


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#19 OFFLINE   Riggo

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Posted 18 January 2016 - 05:38 PM

I didn't realize that Adaptive Cruise Control can only use regen to slow the car. I thought it also used the friction brakes as needed.


I thought that as well. I've had it slow down incredibly fast and didn't think the regen brakes could do that.

#20 OFFLINE   murphy

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Posted 18 January 2016 - 05:41 PM

I didn't realize that Adaptive Cruise Control can only use regen to slow the car. I thought it also used the friction brakes as needed.

Given the number of times it has gone into heavy braking due to a car that is turning in front of me I'm glad it can't.  I know the car will be out of the way long before I get there and have to hit the accelerator to override the braking.  The cruise control will take the car down to some low speed that I forget (maybe 12 mph) emit a ding and go off line leaving me to take over.






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