DR61
Member
Agree; even if the system actually will avoid collision more than half the time in real world situations, an auto maker is not going to certify that it will. Maybe they will if the probability gets up to 99%.
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Thoughts on why AEB is designed to only reduce speed by 25mph?
- Thread starter viet658
- Start date
Most people's perceptions of this safety system are formed via television commercials attempting to show off the feature, and not by the feature's actual tangible results. As we all know, commercials cannot tell a lie...
boiler81
Member
AEB as implemented by Mercedes and others, will apply braking (40%) without driver input and alerts driver visually and audibly. If driver touches brake while AEB is active, AEB applies 100% braking, in most cases preventing collision. AEB acts at the latest possible moment, allowing following vehicles the greatest chance to also stop or take evasive moves.
No guarantees, but I can tell you from experience, it can prevent the collision, at least at lower than highway speeds.
Liability = units x ( failure rate x cost of failure - (1 - failure rate) x value of success ).
I think 3) Liability is redundant given 1) and 2).
JeffK
Well-Known Member
For Mercedes drivers, we should note that Mercedes autonomous braking only works from 4 mph up to 65 mph according to the manual (pg 68 on the left), and if the object is stationary will work only up to 31 mph.
"Adaptive brake assist" is a totally different feature which helps with braking force up to much higher speeds but requires the driver to hit the brake.
sreams
Member
It seems to me this could be improved pretty easily. If the rear camera detects that there are no cars behind you, it could then opt to do a full stop with AEB, since nobody is there to rearend you.
JeffK
Well-Known Member
There are still safety issues with this.
What if you have a dog in the back? What if child seats aren't secured properly? What if it's icy or wet or salt on the roads, etc etc.
AEB is not perfect and a false positive can end up doing more harm than good if it were to apply full braking force by itself.
The best thing for AEB is to apply some brake as soon as possible before the human can react, only after the human reacts to slam the brakes then vehicles with braking assist will help apply necessary braking force.
sreams
Member
Maybe it is something that can be enabled as an option (and must be actively enabled at the start of each drive). If you know your belongings/pets are secured, and your child seats are properly mounted, turn it on.
Our BMW 750 will brake at any speed, including pressing the accelerator into a car. For example, I was making a right turn onto a main street, car in front. Car in front starts moving, I assume he cleared and while I was looking left he decided to brake. I had pressed the accelerator to move forward and my BMW 750 slammed the brakes to the ground bringing us to a full abrupt stop. Scared the heck out of all of us including me because it happened so fast.
I would have rear ended the car in front of me if it was not for that.
I would have rear ended the car in front of me if it was not for that.
It also keeps your from bumping a car when parallel parking, both front and back. Pressing the gas pedal gets you nowhere if you're within 4 inches of a car. You can override it by pressing a button on the center console that basically defeats all of the safety systems. It's pretty insane, I'm hoping Tesla can get to that level soon.
This is how I would have expected AEB to react in the same situation... but, what if you needed to accelerate to perform an evasive maneuver?
I’m thinking the kick down button on the BMW will override it.
BMW is famous for having a small button at the bottom of the gas pedal which will override the mode you’re in. Like if you have it on manual shift you can step on the gas all the way and it’ll stay in the selected gear. But once you press it past the “kick down” button it will put the car back in auto mode and downshift to the best gear to accelerate out of your situation.
Sawyer8888
Member
Yes. "Basically" a Tesla should come to a complete stop in stop-and-go traffic, but not always.
Why does this happen and why does AEB only slow down when traveling in excess of 29 mph? Simple: "Autopilot is not perfect."
Why doesn't AEB stop the car completely in all instances when TACC and AP are not engaged? After all, false-positives would not exist when all other driver-assist features are turned off. Right?
DR61
Member
False positives are a problem for all AEB systems by all car makers. The sensors used by the AEB programming are the same ones used by TACC/autosteer, so of course the same false positive problem exists. False positives can cause accidents, so some balance is required. In my opinion the technology will never be perfect, but it will continue to increase safety as it is developed.
JeffK
Well-Known Member
Yes. "Basically" a Tesla should come to a complete stop in stop-and-go traffic, but not always.
Why does this happen and why does AEB only slow down when traveling in excess of 29 mph? Simple: "Autopilot is not perfect."
Why doesn't AEB stop the car completely in all instances when TACC and AP are not engaged? After all, false-positives would not exist when all other driver-assist features are turned off. Right?
I'd argue most other cars with AEB would have the same trouble recognizing the corner of an armored truck as a "car"
Most implementations of AEB use object recognition. User manuals of many of these, including some of the ones I've linked to mention they don't work for non-cars, or in turns, or in bad weather conditions, etc.
Keep in mind AEB is a driver-assist feature
seattlite2004
Active Member
Leaf's AEB is a pretty cool driver assit package. AEB demo is towards the end of the vid below:
Good to know the new Leaf is able to come to a complete stop. Is there a similar test for any of Tesla's vehicles?
JeffK
Well-Known Member
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