How does the Autonomous emergency braking work?

[nickpike]

Reference the Autonomous emergency braking, the UK web page says.
The Autonomous emergency braking (AEB) system automatically activates the brake when it detects dangerous sudden brake activation by the car ahead by reading the front radar signal from the Smart cruise control (SCC) and the signals from the Lane departure warning system (LDWS) camera. It stops the vehicle to minimize damage to it and the driver in emergencies. The brake system is fully activated at speeds below 80km/h.

So if I the car is above this speed, does it not work?
Also, do the SCC and LDWS need to be on and active?

I remember this braking system working for me once, but I'm sure I did not have the SCC on at the time.


http://www.hyundai.co.uk/new-cars/genesis
It's quite a nice site and worth a look.

 

[biturbo]

On speeds over 80 km/h AEB "slowly reduces speed", as per Owner's Manual:

"Brake operation
In a critical situation:
• The brake assist system enters
standby mode to react promptly
when the driver operates the brake
pedal.
• The vehicle automatically reduces
speed according to the severity of
the situation.
- Rapidly reduces speed when vehi-
cle speed is under 50 mph (80
km/h)
- Slowly reduces speed when vehi-
cle speed is over 50 mph (80 km/h)
• If the driver uses the brake pedal to
reduce vehicle speed, the brake
assist system operates to increase
braking efficiency.
• If the driver presses down hard on
the accelerator pedal or sharply
turns the steering wheel, the brake
assist system is canceled."

AEB does not require SCC or LDWS active.
But a car without SCC cannot AEB because it has no radar sensor.

 

[Genesisimo]

The AEB on the 2016 Genesis with Tech Package is much less sensitive than the first generation AEB on my 2006 Acura RL (Legend) with Tech Package. In fact, in the 10 days before my new 2016 Genny went into the shop (see separate thread ), it never activated once despite some hairy situations in Los Angeles freeway driving. The service loaner, same model, does give a forward alert when the closure rate is very high. However, the alert is much less intense than on the Acura and I have not yet observed autonomous braking or pre-tensioning of seat belts in over a week of driving it. The Acura saved my bacon many, many times.

The sales guy said that Genesis AEB is only active between 5 mph and 50 mph. The info above about modified behavior above 50 mph makes more sense though. All told, I don't fully trust it yet.

 

[MoabGen]

I've had the car alert me a few times when coming up to a stopped vehicle, but it has never applied any braking power, even when it probably should have. I have also set off the alert while coming up quite fast (gas pedal heavily applied) behind another car before changing lanes.

Let's just say I've never kept my foot off the brake long enough to definitively test it.

 

[MelFranks]

Super quick answer from experience, it autonomously brakes (meaning applying full braking) if you approach a car too quickly. Definitely worth it.

 

[balfor]

Coincidentally, mine just kicked in for the first time today. I have had several warnings in the past but the automated braking never kicked in.

Today I was going full speed on the interstate and cars suddenly slowed in front of me. I was on the brakes but the system apparently calculated that my braking was insufficient and my car was closing too quickly to the one in front. The braking suddenly increased by itself to maximum, but just as it did the car in front of me had let off their brake and started to go again. My cars braking eased up and it went back to slowing at the pace I was pushing on the brake. To show how fast the slowdown was, a car right next to me very nearly hit the car in front of him and he had to swerve to another lane to avoid a collision.

I was impressed at how the system kicked in and then had the capability to disengage immediately and return to driver control when it determined there was no longer a need for maximum braking. I hope I never really need it but I think it passed the first test in impressive fashion.

 

[Mark_888]

You can set up your test under various conditions to see how it works. Get some really large cardboard boxes and put them on a parking lot and do some tests driving toward them without manual braking.

Make sure you don't use real objects like these idiots at Volvo:
https://www.youtube.com/watch?v=m6ZwS9izm4E

 

[celltech]

I believe AEB will work at nearly any speed to some extent. But obviously when you are going fast enough, and by the time the radar can "see" what is up ahead, it can only slow down so much even at full braking power.

Mine actually kicked in once when a cyclist started to drift into the road as I was about to pass him. The car got quite angry and hit the brakes hard for a split second until he meandered back onto the shoulder. I was impressed the radar was able to see him off to the side like that.

As a side note, I have noticed the SCC will brake much later and harder than I would expect when the distance is down to 1 bar. It takes quite the leap of faith to trust it in the city.

 

[Jakekells]

I thought the radar only recognized the rear of another vehicle. Not cardboard boxes or a bicycles. I have seen commercials where they use a barrier with the rear of a vehicle painted on it. Assumed they did that so the radar would recognize another vehicle and panic stop. Any thoughts?

 

[Aquineas]

Balfor thanks for that anecdote! It's reassuring, because like you I've had mine warn me quite a few times but never quite kick-in.

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[celltech]

I thought the radar only recognized the rear of another vehicle. Not cardboard boxes or a bicycles. I have seen commercials where they use a barrier with the rear of a vehicle painted on it. Assumed they did that so the radar would recognize another vehicle and panic stop. Any thoughts?

The radar can't tell a car from a moose...it just "sees" a reflection ahead and knows you are heading for it.

 

[Aquineas]

The radar can't tell a car from a moose...it just "sees" a reflection ahead and knows you are heading for it.

Considering some of these horrifying pictures of people hitting moose (meece?), I'm not sure which would be worse.

 

[Mark_888]

I thought the radar only recognized the rear of another vehicle. Not cardboard boxes or a bicycles. I have seen commercials where they use a barrier with the rear of a vehicle painted on it. Assumed they did that so the radar would recognize another vehicle and panic stop. Any thoughts?

So it would run over a person or hit a building? What about the side of a car?

No, the painted card board boxes are just for show. The car is supposed to stop even if the cardboard is not painted.

 

[amartz]

So it would run over a person or hit a building? What about the side of a car?

No, the painted card board boxes are just for show. The car is supposed to stop even if the cardboard is not painted.

I've got to wonder how well radar would see cardboard, as opposed to metal??

 

[Mark_888]

I've got to wonder how well radar would see cardboard, as opposed to metal??

What about a person?

 

[ksoze]

What about a person?

The manual says it does not. That is more likely driven by legal reasons rather than actual capability. These systems are complex and heavily dependent on many factors, including environmental challenges as well as the fine tuning for maximum benefit and minimum false readings.

 

[5 Timer]

The sales guy said that Genesis AEB is only active between 5 mph and 50 mph.

Owners manual says the AEB is designed to function between 5 mph and 110 mph

I thought the radar only recognized the rear of another vehicle. Not cardboard boxes or a bicycles.

The radar can't tell a car from a moose...it just "sees" a reflection ahead and knows you are heading for it.

So it would run over a person or hit a building? What about the side of a car?

Again, the owners manual gives a list of examples of what the AEB cannot detect.

I would think that the AEB would detect large cardboard boxes, but a spindly legged moose.... I'm not so sure.

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[sheldonkreger@gmail.com]

Does the coupe have this feature? I have a 2016 R-spec.

 

[ksoze]

Again, the owners manual gives a list of examples of what the AEB cannot detect.

All of which have some heavy legal input. It says it does not detect "Stopped Objects", which would include a stopped car in front of you? Clearly it does.

 

[Mark_888]

The manual says it does not. That is more likely driven by legal reasons rather than actual capability.

I agree. But to find out whether it actually "can" detect a person, who should we nominate to be the test subject?