Collision avoidance system engages for no reason

[vks]

Don’t try to change lanes in heavy slow freeway traffic. For example, you’re cruising along at 65 with ACC on. Traffic slows to 20. A car passes on your left going say 25 and you decide to change lanes into the spot behind it. ACC, sensing the car in front of you is going 20, has you at 20. As you change lanes, the sensor interprets the small space between lanes as open road and accelerates hard toward 65, then as you finish the lane change behind the car going 25, it has to slam on the brakes. Scares the crap out of you and makes the drivers around you think you’re having a seizure. My advice, if you’re using ACC, stay in one lane.

Gotcha. Very helpful. Does sound scary. Will keep that in mind.

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[WattTurbo]

This and the take over steering function on this car are annoying. I haven't had any near misses, just unnecessary jumps in heart rate.

The first thing my wife does when she drives the car is press that button to disable this feature because she hates it. The first thing I do when I drive the car next is I turn it back on. After driving it for a year I have developed a natural reaction to hold the steering wheel so it doesn’t startle me anymore. It’s the slamming on the brakes when backing out of my garage or into a parking spot that still gets me. I always brace for it, but you can turn that off too.

 

[D00notD00d]

Say more about ACC Not asking to be cheeky, just curious as a relatively new Taycan owner

Don’t try to change lanes in heavy slow freeway traffic. For example, you’re cruising along at 65 with ACC on. Traffic slows to 20. A car passes on your left going say 25 and you decide to change lanes into the spot behind it. ACC, sensing the car in front of you is going 20, has you at 20. As you change lanes, the sensor interprets the small space between lanes as open road and accelerates hard toward 65, then as you finish the lane change behind the car going 25, it has to slam on the brakes. Scares the crap out of you and makes the drivers around you think you’re having a seizure. My advice, if you’re using ACC, stay in one lane.

i’ve experienced similar with Innodrive and gave up on it in favour of ACC. Acceleration to reach the speed limit is way too sudden. I prefer to stay in control. Likewise lane assist, which spoils the steering experience. I came here tonight to investigate if anyone has had spurious collision warnings resulting in heavy breaking. Tonight I was waiting to turn left, with one other car in front. When that exited the junction I pulled forward to the T. The car slammed on the brakes and the collision warning message flashed up. There was nothing around me. I assume a car must have passed in front of me on as I was pulling up to the T. Scared the bejesus out of me. I thought I’d been rear ended or had hit a person or a dog. Conflicting road markings in road works confuse the hell out of lane assistance. Gradually turning off the assistance systems one by one. I’ve lived without them in over 40 years of driving, they seem unreliable and ‘accident prone’.

 

[anonymouse]

I came here tonight to investigate if anyone has had spurious collision warnings resulting in heavy breaking.

if you google “AEB false positive” you will see that every manufacturer has occasional unexpected braking in their collision avoidance systems. The general view (which is leading to these systems becoming mandatory in some countries) is that it is better to have occasional unexpected braking (easily fixed with a blip on the accelerator) than one death or serious accident.

Tesla social media is rife with complaints about “phantom braking nearly killed me”. What we have learned over 6 years or so of advanced systems is (a) most reports about screaming to a halt are an exaggeration; (b) no one runs in to you if you brake a bit - rear end collisions are largely a myth; (c) reports tend to be less frequent from more experienced owners, who instinctively anticipate the situations where the computer will read a scenario wrongly.

Most drivers think they are perfect. Some automation protects them from those moments when they aren’t.

 

[vks]

if you google “AEB false positive” you will see that every manufacturer has occasional unexpected braking in their collision avoidance systems. The general view (which is leading to these systems becoming mandatory in some countries) is that it is better to have occasional unexpected braking (easily fixed with a blip on the accelerator) than one death or serious accident.

Tesla social media is rife with complaints about “phantom braking nearly killed me”. What we have learned over 6 years or so of advanced systems is (a) most reports about screaming to a halt are an exaggeration; (b) no one runs in to you if you brake a bit - rear end collisions are largely a myth; (c) reports tend to be less frequent from more experienced owners, who instinctively anticipate the situations where the computer will read a scenario wrongly.

Most drivers think they are perfect. Some automation protects them from those moments when they aren’t.

This resonates strongly with me. My experience over the past three months with my car is very consistent. Now I know when the system will react in a suboptimal manner and am ready to intervene. This is certainly a learning curve, and I suspect the learning curve is different for different cars/systems. In general, I feel safer, not otherwise, when driving with these systems active.

 

[D00notD00d]

if you google “AEB false positive” you will see that every manufacturer has occasional unexpected braking in their collision avoidance systems. The general view (which is leading to these systems becoming mandatory in some countries) is that it is better to have occasional unexpected braking (easily fixed with a blip on the accelerator) than one death or serious accident.

Tesla social media is rife with complaints about “phantom braking nearly killed me”. What we have learned over 6 years or so of advanced systems is (a) most reports about screaming to a halt are an exaggeration; (b) no one runs in to you if you brake a bit - rear end collisions are largely a myth; (c) reports tend to be less frequent from more experienced owners, who instinctively anticipate the situations where the computer will read a scenario wrongly.

Most drivers think they are perfect. Some automation protects them from those moments when they aren’t.

Thanks for replying.
“What we have learned over 6 years or so of advanced systems is”

Who is the “we” you refer to and where can I find the published research for those assertions? Is the research independent?
Thanks.
I’ve read the following link, which doesn’t inspire confidence https://www.overdriveonline.com/reg...reports-suggest-aebs-not-ready-for-prime-time

What protects imperfect/uneducated drivers (I.e. all of us) from immature and imperfect Lane Change, ACC, Innodrive and Collision Warning AI? I want my AI to at least tell me what it is doing when accelerating, braking or steering. Especially since I drive more than one car and programming will differ.

(b) no one runs in to you if you brake a bit - rear end collisions are largely a myth;
Automatic “Emergency” Braking is much more severe than “braking a bit”

 

[D00notD00d]

I don't think this issue is isolated to just the Taycan. I experienced the collision avoidance system kicking in while driving my wife's Mercedes EQE. For no reason, it just decided to slam on the brakes while I was backing out of an empty parking lot. The problem was remedied by an OTA update.

How do you know that the update fixed the problem?

 

[D00notD00d]

This resonates strongly with me. My experience over the past three months with my car is very consistent. Now I know when the system will react in a suboptimal manner and am ready to intervene. This is certainly a learning curve, and I suspect the learning curve is different for different cars/systems. In general, I feel safer, not otherwise, when driving with these systems active.

Do you know if the AI braking system factors in weather conditions such as snow/ice, autumn leaves blowing around?

 

[DougFrisk]

This resonates strongly with me. My experience over the past three months with my car is very consistent. Now I know when the system will react in a suboptimal manner and am ready to intervene. This is certainly a learning curve, and I suspect the learning curve is different for different cars/systems. In general, I feel safer, not otherwise, when driving with these systems active.

In my work with high school robotics teams I've found myself behind the wheel of a 26,000 pound Class 6 truck more than I'd like. It's interesting driving the ones with ADAS because coming from an automobile world, my following distances are nowhere near where the truck thinks they should be. It took me several "phantom braking" incidents to figure out that the truck was reacting to a car slowing down to make a turn 5 seconds ahead of me. But once I figured it out, I decided that the truck was probably right and I was the one who was following too closely.

 

[Jon Steinmetz]

I will say I have had a couple of incidents like this when making a left turn. Scares the heck out of me. For me it was always in the same kind of situation, making a left turn after a car has passed or the other car was making a right from the same street I was turning onto.

 

[YWGT3]

How do you know that the update fixed the problem?

The problem seemed have to stopped following an OTA update on the Merc. It's been eight months of worry-free sudden brake slamming but now I'm having to bring it in for servicing due to an active collision system fault warning.

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