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  #13  
Old 03-11-2015, 09:27 PM
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Re: Is the Forward Collision Prevention system different on the Cherokee?

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Originally Posted by Roadkill View Post
Thanks. Reading that was the metaphorical tour of a sausage factory.

FCW will only apply 1/3 of braking force for a maximum of 1.5 seconds before releasing the brakes to allow us to smash into our doom, and it won't activate at all on stationary objects even when it determines a collision is imminent (it will sound a "you're going to die but I won't do anything about it" alert for you, though).

I wonder if FCW 2.0 will have a "email next of kin" option that triggers after it releases the brakes and sends the Jeep hurtling into the collision.
I think it works fantastic. The idea is it will initiate avoidance before you do. Because you spilled coffee on your lap or some other distraction. Or fighting with the NAV system.

It's being conservative to not cause more harm.

It's a reasonable first step. And if you look in threads that discuss it, everyone I've seen reply said they would not buy another car with out.

I'm looking into replacing my wifes car now. Maybe a MB CLA.

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  #14  
Old 03-11-2015, 09:34 PM
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Re: Is the Forward Collision Prevention system different on the Cherokee?

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Originally Posted by silvermax04 View Post
I think the key is that you need to touch the brakes in some capacity so the system knows you intend to stop the vehicle. If you do that and it determines you are not doing enough it adds necessary braking to try and prevent an impact.

if you are on the gas and you stay on the gas you are just going to get the beeping shuttering and that 1.5 second thing continue to stay on the gas after all that and you will plow into the car in front of you.

"If the driver does press the brake at any time during these steps and the system determines more brake force is required to avoid or mitigate the impact, the system will supplement additional brake force as required."

So there is that 4 step warn with minimal braking while you are on the gas and then if you do respond and touch the brakes the car wakes up and says ah he definitely does want to stop let me help and jumps on the brakes harder to meet the needs of the situation.

That is my understanding of it anyway
Yup, that's the "Advanced Brake Assist".
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Old 03-12-2015, 06:48 AM
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Originally Posted by mswlogo View Post
And if you look in threads that discuss it, everyone I've seen reply said they would not buy another car with out.
Here's your counterexample then. I won't consider this a compelling feature until they improve it.

I suppose I'll leave it enabled on my 2014, sad sack though it is. I feel similarly as if I had bought a vehicle with "air bags" only to find out "air bag" meant "whoopee cushion glued to steering wheel".
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Old 03-12-2015, 08:02 AM
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I think it is a slippery slope to determine how much you acctually want the system to do. On one hand we want it to stop us from being in an accident but on the other not to intrusive. If you are on the gas and you are coming up on a car hard because your intention is that you want to cut over to the other lane at the last second for whatever reason. In a situation like that car would think you are going to be in an accident would you want the car standing on the brakes if you are on the gas in that situation, no because you have other plans the car doesnt know about. The technology is there to get the car stopped, look at the ACC. If that is engaged the car knows it needs to react and maintain that set distance from the car in front of it. Car in front stands on the brakes to a stop ACC will do the samething and stand on the brakes to a stop, or try anyway. I think the problem is the car needing to understand your intentions and currently the only way they do that is if you touch the brakes. It could use improvement but im not sure what the answer is. Be nice to understand what some of the other manufacturers are doing as they are getting higher ratings.
The system works fine as a back up just in case thing, im glad it is there just the warning alone has helped me a few times.
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Old 03-15-2015, 10:14 PM
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Re: Is the Forward Collision Prevention system different on the Cherokee?

Quote:
Originally Posted by silvermax04 View Post
I think it is a slippery slope to determine how much you acctually want the system to do. On one hand we want it to stop us from being in an accident but on the other not to intrusive. If you are on the gas and you are coming up on a car hard because your intention is that you want to cut over to the other lane at the last second for whatever reason. In a situation like that car would think you are going to be in an accident would you want the car standing on the brakes if you are on the gas in that situation, no because you have other plans the car doesnt know about. The technology is there to get the car stopped, look at the ACC. If that is engaged the car knows it needs to react and maintain that set distance from the car in front of it. Car in front stands on the brakes to a stop ACC will do the samething and stand on the brakes to a stop, or try anyway. I think the problem is the car needing to understand your intentions and currently the only way they do that is if you touch the brakes. It could use improvement but im not sure what the answer is. Be nice to understand what some of the other manufacturers are doing as they are getting higher ratings.
The system works fine as a back up just in case thing, im glad it is there just the warning alone has helped me a few times.
I suspect if a late build 2014 or 2015 GC were tested today it would rate similar to the 2015 Cherokee. Which is rated very good. The current published tests are from an early build 2014 which had a prior generation Bosch system that could not do ACC Full stop.

The only thing missing is Lane Assist.

There are better systems like Subaru Eyesight which can detect Stationary Objects. It is all cameras, but is impaired when driving conditions are impaired which is when you might need it the most.
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