Progressive Brake Lights
02-28-2005, 08:07 AM
#31
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The DSC overview document of TIS explains the DBC a bit more...
SBT__Dynamic_Stability_Control_DSC_8_E60.pdf
SBT__Dynamic_Stability_Control_DSC_8_E60.pdf
02-28-2005, 02:57 PM
#32
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Originally Posted by Rudy' date='Feb 28 2005, 05:08 PM
I always thought that the principle behind BFD was to differentiate between normal, gradual stops and panic or emergency stops.? The thought being that if I am stopping suddenly, the driver behind me needs to know about it before the deceleration is so sudden that a rear-end collision happens.? In many dry-weather conditions, you can panic stop (and BMW's Brake Assist or whatever it's called will maximize brake pressure) without ABS intervening (even though ABS is always "active" and monitoring the current wheelspin to detect impending lockup.)? If BFD only illuminates the extra bulbs "when ABS kicks in" and when you come "to a complete stop," it pretty much defeats the purpose of the system, doesn't it?
cobradav's post makes way more sense.? The ABS sensors (which are always active) calculate a deceleration rate that is known to be sudden (based on the formula he posted) and immediately activate the extra BFD bulbs to warn other drivers that the car is slowing more suddenly than normal.? The bulbs may stay illuminated up to the complete stop -- that's sensible.
What am I missing?
cobradav's post makes way more sense.? The ABS sensors (which are always active) calculate a deceleration rate that is known to be sudden (based on the formula he posted) and immediately activate the extra BFD bulbs to warn other drivers that the car is slowing more suddenly than normal.? The bulbs may stay illuminated up to the complete stop -- that's sensible.
What am I missing?
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The driver started the emergency braking, ABS kicked in, about one second before the car stopped the BFD lit up.
I think on higher speeds it is a little earlier, but we were driving 50 Km/h on the skills and that is how it worked.
Originally Posted by wrlominick' date='Feb 28 2005, 05:14 PM
I remember reading something somewhere about how it also assited braking.? If you take your foot of the gas "suddenly" then it will move the brake pads even closer to the brake disc in anticipation of you hitting the brake, then if you slam the brake really hard it applies full brake force even if you back off on the pressure a little.? This latter is due to the fact that people tend to not press hard enough on the brake in an emergency, they hit it initially but then don't get full stopping power because they don't press all the way, way way, down.? Do we have this feature on the e60?
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It will only be available on E60's built March 05 or later.
Originally Posted by E60Speed' date='Feb 28 2005, 05:20 PM
We are still waiting to hear if it will be available as a software upgrade for earlier cars
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03-01-2005, 05:01 AM
#33
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Here is a new MB version of Braking alert notification for comparison.
Effective against rear-end collisions
In future Mercedes-Benz will make a further contribution towards a reduction in rear-end collisions by means of flashing brake lights. The EU licensing authority has recently approved this technology, and it will now enter series production in the S-Class for the first time.
Research by Mercedes engineers has shown that driver reaction times are shortened by up to 0.2 seconds if a flashing red warning signal is given instead of the conventional brake light during emergency braking. At a speed of 80 km/h this reduces the stopping distance by approx. 4.40 metres, and at 100 km/h by no less than 5.50 metres or so. This means that flashing brake lights are an effective and easily implemented way to reduce rear-end collisions. The Mercedes-Benz S Class is now the first car to feature this innovative, adaptive brake light. It will shortly be followed by the CL-Class Coup?s.
Specialists at Mercedes tested various warning light systems during their study. Brake lights which light up four times as quickly as the amber hazard warning flashers during emergency braking proved particularly effective in alerting following drivers to the danger of a rear-end collision. The Mercedes study also revealed that switching on the hazard warning system in a dangerous situation has no significant effect on the reaction times of other drivers.
Wonder if it would get approved by the US authorities?
Effective against rear-end collisions
In future Mercedes-Benz will make a further contribution towards a reduction in rear-end collisions by means of flashing brake lights. The EU licensing authority has recently approved this technology, and it will now enter series production in the S-Class for the first time.
Research by Mercedes engineers has shown that driver reaction times are shortened by up to 0.2 seconds if a flashing red warning signal is given instead of the conventional brake light during emergency braking. At a speed of 80 km/h this reduces the stopping distance by approx. 4.40 metres, and at 100 km/h by no less than 5.50 metres or so. This means that flashing brake lights are an effective and easily implemented way to reduce rear-end collisions. The Mercedes-Benz S Class is now the first car to feature this innovative, adaptive brake light. It will shortly be followed by the CL-Class Coup?s.
Specialists at Mercedes tested various warning light systems during their study. Brake lights which light up four times as quickly as the amber hazard warning flashers during emergency braking proved particularly effective in alerting following drivers to the danger of a rear-end collision. The Mercedes study also revealed that switching on the hazard warning system in a dangerous situation has no significant effect on the reaction times of other drivers.
Wonder if it would get approved by the US authorities?
03-01-2005, 05:07 AM
#34
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Originally Posted by cobradav' date='Mar 1 2005, 09:01 AM
The Mercedes study also revealed that switching on the hazard warning system in a dangerous situation has no significant effect on the reaction times of other drivers.
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I think the flashing brake lights is a good idea. The key is to get people (at least here in the US) to understand what these new signals mean. Something tells me that the typical American driver will be dazed by the M-B system like a deer in headlights...
03-01-2005, 05:27 AM
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Originally Posted by Rudy' date='Mar 1 2005, 08:07 AM
[quote name='cobradav' date='Mar 1 2005, 09:01 AM']The Mercedes study also revealed that switching on the hazard warning system in a dangerous situation has no significant effect on the reaction times of other drivers.
[snapback]95581[/snapback]
I think the flashing brake lights is a good idea. The key is to get people (at least here in the US) to understand what these new signals mean. Something tells me that the typical American driver will be dazed by the M-B system like a deer in headlights...
[snapback]95586[/snapback]
[/quote]I think you?re absolutely right. None of these efforts by the safety conscious German mfrs is being put to good use in the US. Simply too many untrained and uncaring drivers. I have become so used to the bad driving habits of these people that I am not sure what I would do in a place where driving was taken seriously by the majority of drivers. You can take a horse to water, but???.
03-01-2005, 06:46 AM
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Originally Posted by Rudy' date='Mar 1 2005, 08:53 AM
....you can't make him stop safer? 
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!
03-02-2005, 06:24 AM
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Originally Posted by E60Speed' date='Feb 28 2005, 11:19 PM
There are no 3 Series in customer production at the moment, and it has not been confirmed if the new 3 has LED or LED look brake lights
The old 3 series coupe only had it as indicators
The old 3 series coupe only had it as indicators
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03-02-2005, 06:51 AM
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Originally Posted by mic325' date='Mar 2 2005, 10:24 AM
[quote name='E60Speed' date='Feb 28 2005, 11:19 PM']
There are no 3 Series in customer production at the moment, and it has not been confirmed if the new 3 has LED or LED look brake lights
The old 3 series coupe only had it as indicators
There are no 3 Series in customer production at the moment, and it has not been confirmed if the new 3 has LED or LED look brake lights
The old 3 series coupe only had it as indicators
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[/quote]Thants what I thought!