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  #37  
Old 01-22-2016, 11:24 AM
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Re: turned off Forward Collision Avoidance today

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Originally Posted by perpster View Post
What I don't get is why, when already in ACC mode, it will still flash BRAKE! BRAKE! and beep loudly, when it is already in control and fully breaking on its own. No need to turn my hair white when it has the situation under control from the get-go.
I believe that on the 2015 and older models, the ACC system can only provide a maximum of 50% of the full braking force. If the system detects a situation that may require more force then that, it will alert the driver. It is a warning that you should manually apply the brakes to prevent a possible collision.

I've had the ACC throw a "Brake" warning when a vehicle cut me off while going downhill to a stop light. The system realized that driver intervention was required (full power braking).

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  #38  
Old 01-22-2016, 01:18 PM
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Re: turned off Forward Collision Avoidance today

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Originally Posted by dcorn View Post
Same here. I had the active braking on for a bit after we bought the car. After a couple unneeded panic stops in city traffic, I turned that crap off. Basically if I was sitting in traffic and moved forward while the car in front of me was slowing down, it would violently slam on the brakes. That crap will get you rear-ended very quickly.

I also think the dash warning lights go off way too often, but the one time it saves me, I'll be happy it's on. I can almost predict when it is going to go off based on my driving style. In the city, I got warned like twice a day from turning vehicles.
Almost got rear-ended when it braked unnecessarily (car slowing down in the adjacent right turning lane).....the S-10 behind me was so close I could see that he had his Telus bill tucked behind the passenger sun visor. I deactivated the system when I got home.
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  #39  
Old 01-22-2016, 02:59 PM
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Re: turned off Forward Collision Avoidance today

Quote:
Originally Posted by perpster View Post
What I don't get is why, when already in ACC mode, it will still flash BRAKE! BRAKE! and beep loudly, when it is already in control and fully breaking on its own. No need to turn my hair white when it has the situation under control from the get-go.
Lets all be charitable and note that computer integration into vehicles is still in its infancy, and some of the worst stuff comes when it it is farmed out in small pieces to outside vendors.

"Wow, I never knew it has this radar thingie that is already in control of the vehicle and taking action, so I thought it would be kewl to scare the crap out of the driver"
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  #40  
Old 01-25-2016, 12:06 AM
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Re: turned off Forward Collision Avoidance today

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Originally Posted by lstowell View Post
Lets all be charitable and note that computer integration into vehicles is still in its infancy, and some of the worst stuff comes when it it is farmed out in small pieces to outside vendors.

"Wow, I never knew it has this radar thingie that is already in control of the vehicle and taking action, so I thought it would be kewl to scare the crap out of the driver"
I'm actually very impressed with Jeep's implementation of this feature, and I keep it turned on.
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  #41  
Old 01-25-2016, 12:13 AM
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Re: turned off Forward Collision Avoidance today

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Originally Posted by Snipe315 View Post
I believe that on the 2015 and older models, the ACC system can only provide a maximum of 50% of the full braking force. If the system detects a situation that may require more force then that, it will alert the driver. It is a warning that you should manually apply the brakes to prevent a possible collision.

I've had the ACC throw a "Brake" warning when a vehicle cut me off while going downhill to a stop light. The system realized that driver intervention was required (full power braking).
I don't think this is correct for ACC, but may be correct for FCW when ACC is not in use. In ACC, the system will bring the vehicle to a complete stop if the vehicle you are "following" stops. So it stands to reason that the system will apply as much brake force as it calculates is necessary to keep the set distance from that vehicle.
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  #42  
Old 01-26-2016, 02:09 AM
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Re: turned off Forward Collision Avoidance today

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Originally Posted by perpster View Post
I'm actually very impressed with Jeep's implementation of this feature, and I keep it turned on.
We are very lucky technology has come this far...I just hope drivers don't get an even worse false sense of security when trotting along in their 5k SUV's...but I digress
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  #43  
Old 01-27-2016, 12:38 AM
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Re: turned off Forward Collision Avoidance today

While I agree that I have been issued many false warnings, I still keep it on because it ultimately saved me from a 50+ mph collision. I was on the freeway with ACC off looking to my right at an accident that was about to occur, when the warning comes on and I look ahead only to find my lane completely stopped. Now I agree that this should not be a replacement for good driving, but I think that it has the potential to reduce the amount of accidents that occur.
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  #44  
Old 01-27-2016, 09:15 AM
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Re: turned off Forward Collision Avoidance today

I just moved from a 2014 GC without acc/fcw system to a 2015 with it. I noticed the brake feel is "mushy". Under normal braking the pedal seems to go half way to the floor. Is that normal? I'm wondering if the automatic braking systems change how the brake pedal feels.
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  #45  
Old 01-27-2016, 10:31 AM
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Re: turned off Forward Collision Avoidance today

Quote:
Originally Posted by Snipe315 View Post
I believe that on the 2015 and older models, the ACC system can only provide a maximum of 50% of the full braking force. If the system detects a situation that may require more force then that, it will alert the driver. It is a warning that you should manually apply the brakes to prevent a possible collision.

I've had the ACC throw a "Brake" warning when a vehicle cut me off while going downhill to a stop light. The system realized that driver intervention was required (full power braking).
Quote:
Originally Posted by perpster View Post
I don't think this is correct for ACC, but may be correct for FCW when ACC is not in use. In ACC, the system will bring the vehicle to a complete stop if the vehicle you are "following" stops. So it stands to reason that the system will apply as much brake force as it calculates is necessary to keep the set distance from that vehicle.
Based on my personal experience, I'd say the 2014 ACC and FCW can both apply full braking power without my intervention. I've had FCW activate ABS on dry pavement before.

The programming for both ACC and FCW have a long way to go. The smoothness of acceleration and braking in ACC leave a lot to be desired and the FCW overreacts way too much. Better safe than sorry I guess, but I'll leave it off for now.
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  #46  
Old 01-27-2016, 11:16 AM
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Re: turned off Forward Collision Avoidance today

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Originally Posted by dcorn View Post
The programming for both ACC and FCW have a long way to go. The smoothness of acceleration and braking in ACC leave a lot to be desired and the FCW overreacts way too much.
Agreed. One workaround for the ACC acceleration comment:

I've noticed ACC will accelerate hard if there's a big gap between current speed and the ACC Set speed, but not accelerate hard if the gap is small. So for instance in variable traffic congestion on the highway, if I see that although I can go 50 mph right now, but there is a slowdown ahead, I change the Set speed to a lower number. Example: ACC set for 55 mph. Stop and go traffic opens up from 15 mph. ACC guns it to get to 55. But I can see another slowdown quarter mile ahead. So I thumb the ACC Set speed down to, let's say, 35 mph. Now, ACC gently speeds up to 35, and usually gently slows down when we get to the slowdown ahead.

In a sense it comes down to that ACC sees the one car ahead, but the driver can see much further ahead, and past the one car ahead. We can anticipate what the ACC can't see. ACC has radar, but not x-ray vision.
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  #47  
Old 01-27-2016, 01:23 PM
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Re: turned off Forward Collision Avoidance today

Quote:
Originally Posted by perpster View Post
Agreed. One workaround for the ACC acceleration comment:

I've noticed ACC will accelerate hard if there's a big gap between current speed and the ACC Set speed, but not accelerate hard if the gap is small. So for instance in variable traffic congestion on the highway, if I see that although I can go 50 mph right now, but there is a slowdown ahead, I change the Set speed to a lower number. Example: ACC set for 55 mph. Stop and go traffic opens up from 15 mph. ACC guns it to get to 55. But I can see another slowdown quarter mile ahead. So I thumb the ACC Set speed down to, let's say, 35 mph. Now, ACC gently speeds up to 35, and usually gently slows down when we get to the slowdown ahead.

In a sense it comes down to that ACC sees the one car ahead, but the driver can see much further ahead, and past the one car ahead. We can anticipate what the ACC can't see. ACC has radar, but not x-ray vision.
Seems to me that in a situation like what you described, why wouldn't you just leave it off instead of constantly changing the set speed. I would prefer to concentrate more on what's going on ahead of me and reacting accordingly, as opposed to fiddling with the ACC. I never did nor will I use cruise unless their is a fairly open road ahead.
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  #48  
Old 01-27-2016, 01:28 PM
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Re: turned off Forward Collision Avoidance today

Well, I can live with the false warnings because it otherwise helps. I mean I don't generally tailgate, but the other day I was going to work and there is a 2 lane road that merges to 1... the right lane was half covered in snow still so everyone was single file in the left lane and this fat Yukon XL decides to go from behind me, into the half right lane and get in front of me (after the point where the lanes merged) when there was no space and basically pushed me onto the other side of the road. In my momentary anger, I was tailgating him hard and he decided he'd slam on his brakes. The car noticed a split second before I did and started braking and alerting. I didn't hit him because his Yukon was slow to brake anyway. It's funny how driving can take a person who is otherwise very calm and non confrontational and turn them into a Saint Anger . Thank you forward collision avoidance, you probably saved me from an assault charge.
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