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Old 11-07-2009, 02:13 PM   #1 (permalink)
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CRUISE CONTROL ENGINE BRAKING???

Was driving the other day and set the cruise, then I decided to see what it did when I pressed the stalk to decelerate

I was amazed at the higher rate of deceleration than just from letting go of the pedal....

Now when I do this is the engine braking itself? or is it somehow slightly engaging the brakes when I am using the decelerate feature??
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Old 11-07-2009, 03:34 PM   #2 (permalink)
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It's engaging the brakes.

You don't even have to use the lever to decelerate, you can accomplish the same by acclerating past the set speed and then removing foot from accelerator.

Al night in low light conditions you can see the brake lights.
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Old 11-15-2009, 11:11 PM   #3 (permalink)
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You mean the brake lights come on? I asked a friend who was following me if this is the case as the brakes do come on sa you said but he said there was no brake lights coming on????
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Old 11-19-2009, 11:43 PM   #4 (permalink)
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Quote:
Originally Posted by lkchris View Post
It's engaging the brakes.

You don't even have to use the lever to decelerate, you can accomplish the same by acclerating past the set speed and then removing foot from accelerator.

Al night in low light conditions you can see the brake lights.
sounds really cool.
i have to try this.
would've been a nice one to add to the 'things i didn't know about my car' thread too!
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Old 11-20-2009, 06:25 AM   #5 (permalink)
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Originally Posted by Bimbis View Post
sounds really cool.
i have to try this.
would've been a nice one to add to the 'things i didn't know about my car' thread too!
I found out while driving in the mountians that it holds the speed going up and down hill. This means you add power to climb and brake to decend. For me this means lower mpg and more brake wear so I chose in really high mountains to drive with out cruise.
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Old 11-20-2009, 10:51 AM   #6 (permalink)
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Originally Posted by vettdvr View Post
I found out while driving in the mountians that it holds the speed going up and down hill. This means you add power to climb and brake to decend. For me this means lower mpg and more brake wear so I chose in really high mountains to drive with out cruise.
Me too, plus it's fun to work with the shift buttons or the "slap" shifter.
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Old 11-21-2009, 12:40 AM   #7 (permalink)
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Originally Posted by vettdvr View Post
I found out while driving in the mountians that it holds the speed going up and down hill. This means you add power to climb and brake to decend. For me this means lower mpg and more brake wear so I chose in really high mountains to drive with out cruise.
I usually drive pretty flat roads but at some places for me too CC starts using brakes which I don't like. There should be an option to avoid this but MB must have considered that it would become confusing for drivers if someone expects the car to use brakes and it didn't. And someone in the US would sue MB from the car speeding even if CC was engaged (and even if all old cars do that, MB would get penalized ).

I wonder if this could be version coded to work differently, will have to have a look at the options via SDS.
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Old 11-21-2009, 03:26 AM   #8 (permalink)
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The expectation of Cruise Control is that you set it to "maintain" a specified speed, so it does. How it accomplishes that mandate is not important.

The problem is people were accepting of the older systems that could not maintain a set speed in all driving conditions.

The car should manage the set speed using everything available to the computer including the brakes.

If an owner does not want to maintain a set speed without application of the brakes, increase the speed or shut the cruise control off.

I doubt that MB will design a "Soft Limit" cruise system, of course it would be REALLY easy to do but it would require a significant software change.
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Old 11-21-2009, 04:18 AM   #9 (permalink)
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What I'm after is the system as it is today, including engine braking applied but brakes not being used when engine braking is not sufficient.

I agree that the current implementation is closer to what CC by definition should do but I just find the older approach better, as it actually was on a pre-facelift 211.

I don't think the SW change would be significant, just flag out the request to apply brakes where it is done today.
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Old 11-21-2009, 06:07 AM   #10 (permalink)
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What I'm after is the system as it is today, including engine braking applied but brakes not being used when engine braking is not sufficient.

I agree that the current implementation is closer to what CC by definition should do but I just find the older approach better, as it actually was on a pre-facelift 211.

I don't think the SW change would be significant, just flag out the request to apply brakes where it is done today.
I agree engine braking first then if speed exceeds a specific % wheel brakes. But not wheel brakes first.

Remember the police officer saying,, "the speed limit is the same up the hill as going down".

In the 50's Mississippi was a great place for a ticket at the BOTTOM of the hill. (hill not mountian)
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