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Old 02-17-2013, 06:22 PM
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No longer sure if I trust ACC

When I was first researching the Grand Cherokee, I was excited that it was available with Active Cruise Control and I was eager to give it a shot. I bought my 2012 Overland 5.7 in April and despite a few electronic glitches that would tell me ACC/FCW wasn't working (which disappeared when I restarted the car) I've been a pretty big fan of the system. It's not seamless, doesn't substitute for the driver's own judgment in most situations, but is nonetheless a nice feature to have. However, today it scared the crap out of me. Today I was in the middle lane of the interstate and had the ACC set at 74, distance 2, and had no cars close ahead of me. There was a Range Rover behind me (following much too closely, in my opinion). It had snowed earlier and was still a very windy day. A plastic shopping bag blew across the lane ahead of me, and my FCW went off and the car started the emergency braking which almost caused the car behind me to hit me. Without mentioning the fact that I looked like a complete idiot at the very best, this situation could have been bad. If some irritable person was behind me and thought I was stomping on the brakes to tell him to back off, that could have escalated (the FCW braking obviously isn't full power, but certainly enough to get your attention), and I swear if that Range had been following a foot or two closer, he could have hit me. I love the system but after this I'm very wary of using it again. Has anyone had a similar experience?
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Old 02-17-2013, 06:36 PM
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Re: No longer sure if I trust ACC

Not sure if the radar can differentiate between a shopping bag or a bowling ball or deer. In those cases it would be nice to get a head start on braking...
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Old 02-17-2013, 07:03 PM
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Re: No longer sure if I trust ACC

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Originally Posted by ColdCase View Post
Not sure if the radar can differentiate between a shopping bag or a bowling ball or deer. In those cases it would be nice to get a head start on braking...
99% of the time, the system works just great, and does exactly what I'd expect of it. I've become used to the way it works, so I can often cancel it in anticipation of a false alert, speeding up/slowing down when it doesn't really need to, etc., but I certainly wasn't expecting a drifting plastic bag to set it off!
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Old 02-17-2013, 08:37 PM
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Re: No longer sure if I trust ACC

The alternative is that it is not sensitive enough, a dog scampers out and you crush it. No way to make it perfect.
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Old 02-17-2013, 08:56 PM
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Re: No longer sure if I trust ACC

The salesman I'm working with is trying to talk me into the Advanced Technology Group. I agree with him that they are great features, but I believe they can lull someone into a false sense of security. Of course that's just my own personal opinion, and I also want to immerse myself in the driving experience and keep fully aware of my surroundings. In heavier traffic on interstates I'm even uncomfortable using cruise control. Just "old school" I suppose.
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Old 02-17-2013, 09:02 PM
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Re: No longer sure if I trust ACC

The OP is just lucky that the guy behind him also had adaptive cruise control!


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Old 02-17-2013, 09:04 PM
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Re: No longer sure if I trust ACC

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Originally Posted by bill_de View Post
The OP is just lucky that the guy behind him also had adaptive cruise control!
And probably also lucky he didn't have an unadaptive attitude!
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Old 02-17-2013, 09:16 PM
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Re: No longer sure if I trust ACC

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Originally Posted by bill_de View Post
The OP is just lucky that the guy behind him also had adaptive cruise control!


.
...and that it was working. It was a Range Rover after all
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Old 02-17-2013, 09:17 PM
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Re: No longer sure if I trust ACC

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Originally Posted by jacko15 View Post
And probably also lucky he didn't have an unadaptive attitude!
Well played!
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Old 02-17-2013, 09:33 PM
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Re: No longer sure if I trust ACC

Bill, Jack, SMG, you three cracked me up.
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Old 02-18-2013, 04:40 AM
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Re: No longer sure if I trust ACC

FCW isn't perfect-- I've noticed that it gets a bit scared of corners, particularly on nice windy roads we have here in Europe. But I've only had the ACC pull emergency braking on me once, and that was an idiot pulling in front of me on the autobahn without looking in his mirror-- so it did exactly what it was supposed to, exactly when it was.
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Old 02-18-2013, 06:41 AM
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Re: No longer sure if I trust ACC

FYI, the FCW does not apply the brakes (at least not on the 2012 JGC). The ACC system will apply up to a maximum of 25% of the vehicle’s braking capability


Forward Collision Warning — If Equipped

Forward Collision Warning (FCW) warns the driver of a
potential collision with the vehicle in front of you and
prompts the driver to take action in order to avoid the
collision.
FCW monitors the information from the forward looking
sensor as well as the Electronic Brake Controller (EBC),
wheel speed sensors, i.e., to calculate a probable rear-end
collision. When the system determines that a rear-end
collision is probable a warning message (both audible
and visual) will be displayed on the EVIC. When the
system determines a collision with the vehicle in front of
you is no longer probable, the warning message will be
deactivated.

ADAPTIVE CRUISE CONTROL (ACC) — IF
EQUIPPED


Adaptive Cruise Control (ACC) increases the driving
convenience provided by cruise control while traveling
on highways and major roadways. However, it is not a
safety system and not designed to prevent collisions.
ACC will allow you to keep cruise control engaged in
light to moderate traffic conditions without the constant
need to reset your cruise control. ACC utilizes a radar
sensor designed to detect a vehicle directly ahead of you.
NOTE:
• If the sensor does not detect a vehicle ahead of you,
ACC will maintain a fixed set speed.
• If the ACC sensor detects a vehicle ahead, ACC will
apply limited braking or acceleration (not to exceed
the original set speed) automatically to maintain a
preset following distance, while matching the speed of
the vehicle ahead.
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