Adaptive Cruise - Your experience - Jaguar I-Pace EV400 Forum
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post #1 of 26 (permalink) Old 02-06-2019, 09:16 PM Thread Starter
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Adaptive Cruise - Your experience

Wanted to pose to those that have driven with the adaptive cruise on.

I have been consulting with a friend of mine that has a Model X for 18 months and we have much in common with the adaptive cruise. If we set the follow distance to 4 bars for me, max for him but not sure of the graphiic on the Tesla we both have people cut in front of us causing us to be pushed farther back.

I have noticed that the car despite my following distance setting will wait to brake longer than I would and then brakes more aggressively. Quite honestly is scares the crap out of my wife. I was comparing notes with my fellow Tesla owner and he said it does the same thing with him. He said that after 18th months that sometimes he gets concerned that the car will actually start to stop in-time and he takes over to play it safe. I have had similar experience.

I noticed that the Adaptive cruise icons for the following distance and lane keep assist are the same on the IPace and the 2019 Sante Fe we just picked up to replace our 2003 Expedition. Made me think the technology is licensed from the same company. Based on the performance similarities of my Tesla driving friend, could it be Tesla? Tesla did make many EV patents available. IDK if vehicle control such as adaptive cruise and emergency braking are some patents they owned and made available. Does anyone know the answer to that? And what is your experience with stopping with adaptive cruise. Has anyone used cruise to come upon a vehicle stopped at a light and felt as though the IPace would not stop in time but just trusted the tech?
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post #2 of 26 (permalink) Old 02-06-2019, 09:47 PM
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Great thread.

[Edit: this refers mostly to Steering assist but because it functions in conjunction with adaptive cruise control I reposted it here]

I'm cross-posting this because it's relevant:

On straightaways and very gentle curves with clear lane markings it's good enough that you can temporarily take your hands off the wheel. If the curves get tighter it wobbles but it does a good enough job that all you have to do is help it a bit by actively steering to stay in the middle of the lane and not drift too much.

In more challenging situations it quits and picks back up fairly often. But that's ok because I have hands on wheel and paying attention. Given that the system is has its (documented) limitations, the silent quitting and picking back up is a feature, not a bug. I wouldn't want it to dingdingding all the time, and even in these situations it performs well enough that it makes for much more relaxed driving. Combined with the adaptive cruise control it's significantly stress-reducing.

Last edited by sciencegeek; 02-06-2019 at 09:53 PM.
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post #3 of 26 (permalink) Old 02-06-2019, 09:50 PM
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Quote:
Originally Posted by bguidizi View Post
And what is your experience with stopping with adaptive cruise. Has anyone used cruise to come upon a vehicle stopped at a light and felt as though the IPace would not stop in time but just trusted the tech?
I just did a bunch of these in the past couple of days. You have to pay attention but it stops in time and not too abruptly IMO. Then you give it a little push with the gas pedal and off it goes again. It's not perfect but I'm not freaked out by its behavior. Just today I drove home from a friend's place (10 miles) and the vast majority, including stop signs and red lights AA was working as advertised.
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post #4 of 26 (permalink) Old 02-07-2019, 12:37 AM
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I like using the Adaptive Cruise in city driving. But, one thing I find is that it waits to start slowing down much later than I would if I was in control. It brakes harder/later than I want to. To help combat this, I actually used the following distance buttons more. For normal city driving, following distance 2 is "normal" for where I live. But, when I see a red light in the near distance, I change it up to level 4 - so that my car starts slowing sooner. Then, when we're moving again, I go back to follow level 2.
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post #5 of 26 (permalink) Old 02-07-2019, 01:07 AM
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Adaptive cruise (AC) is far from perfect. Human driver can easily do better as long as you are paying attention.

If following a vehicle to a stop AC seems fine but not as smooth as it could be. If approaching a stopped vehicle I do not trust it to stop in a reasonable manor. I believe this is a bit normal for AC to mostly ignore stopped objects and the emergency braking comes into play.

AC seems to use the brakes more than needed. Also seems to limit regeneration braking so I expect some or a lot of efficiency loss. Needs to just coast a bit more to extend the distance. Following distance seems to shorten up without expected slowing and then finally needs to use the brakes too much. I honestly do not mind going slower and letting vehicles cut in.

I see AC in the I-Pace much better at the open road than fighting urban traffic. Would be interesting to have the top engineer for a ride along to understand what the heck they are thinking.
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post #6 of 26 (permalink) Old 02-07-2019, 01:13 AM
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It's possible that our cars behave differently because things are still buggy.

In my case today I used ACC plus Steering assist for 80% of freeway driving, ranging between 55 and 80 mph, for about 100 miles (so a good sample). Against the wind much of the time (>50%) ... 200 mile range (i.e., 41 kWh/mile average). No net elevation delta. If it uses more energy it's not much. I had multiple instances of cars cutting in front, slowdowns, and stopsigns/lights in town. Not a problem.
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post #7 of 26 (permalink) Old 02-07-2019, 01:35 AM
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I think AC brakes too hard when somebody cuts in front of me, but that's probably a good thing. I usually set it to three bars to limit such cuts, and I find that it keeps a wonderfully accurate following distance through many speeds. As for who they licensed from, I dunno. Lots of options there.
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post #8 of 26 (permalink) Old 02-07-2019, 05:57 AM Thread Starter
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One thing to add.
I noticed a slow down conservative reaction to a vehicle exiting the road to the right when ACC is on. It slows more than necessary and slow to get back up to speed. Not what was expected, especially how it brakes aggressively.
Glad to hear your experiences. I would prefer it regen to slow down rather than brake so aggressively as it is out of my normal comfort mode for slowing/braking and I don't think I am that conservative. Would like to take advantage of the regen where possible. It would be nice if this were a setting in ACC.

Any thoughts if this is licensed from Tesla?
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post #9 of 26 (permalink) Old 02-07-2019, 06:56 AM
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I have used the Adaptive Cruise and am very impressed. When using the steering assist only, the car seems to wander and vibrate more as it sort of ping pongs between the lines. When you activate the Adaptive Cruise, things seem to suddenly tighten up and the car tracks straight as an arrow. It handles gentle curves very well and only seems to lose it’s tracking one the lane lines are covered in snow or ice. I had the family in the car and freaked them out by activating the cruise then turning right around in my seat to start a conversation for a few seconds which caused them to start screaming at me to turn around. .

Before you start giving me heck, the passenger up front was in on the joke and my inattention was for only a few seconds. just long enough to install terror.

Anyhow, we were driving along a country road with the car in AC and I saw a tractor ahead pull out into the road. I said to the family ‘let’s see how this thing responds’ and watched it’s behaviour. It saw the tractor in plenty of time and slowed the Jag briskly, but not in a manner that induced panic and dropped to 15 km/h behind the tractor. It behaved perfectly. I was very impressed.

This is my first vehicle with this technology and it really reduces stress on the highway as previously I was constantly adjusting the cruise and ‘defending’ my lane from people trying to cut in front of me.

Very cool tech. I wonder how advanced it is for future enhancements? I think Tesla has significantly more sensors etc to allow for independent navigation.
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post #10 of 26 (permalink) Old 02-07-2019, 07:39 AM
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Quote:
Originally Posted by WattAJag View Post
I like using the Adaptive Cruise in city driving. But, one thing I find is that it waits to start slowing down much later than I would if I was in control. It brakes harder/later than I want to. To help combat this, I actually used the following distance buttons more. For normal city driving, following distance 2 is "normal" for where I live. But, when I see a red light in the near distance, I change it up to level 4 - so that my car starts slowing sooner. Then, when we're moving again, I go back to follow level 2.
Wouldn't it be easier to just brake and accelerate yourself, using the gas and brake pedals rather than ACC? No 'combat' required!
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