05-27-2011, 09:41 AM | #2 |
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Dynamic Cruise Control also applies breaking power when going downhill to maintain constant speed. It just holds your programmed speed a little bit better than regular curise control
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05-27-2011, 10:15 AM | #3 |
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You're thinking of the hill descent feature Harplayr.
The difference between dynamic cruise control and the normal version is that for the normal version only lets you set a certain speed then you have to steer and brake accordingly. For dynamic cruise control it works the same way as the normal one, you still have to steer the car yourself but the car uses sensors to detect the vehicle in front of you and maintain a set distance that way you don't rear end the car in front of you or have to constantly adjust the settings when using cruise control. |
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05-27-2011, 10:25 AM | #4 | |
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DCC just allows you to store and maintain a constant speed. I guess the dynamic part is the fact you can change the set speed using the buttons on the steering wheel rather than touching the pedals
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05-27-2011, 10:41 AM | #5 |
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In fact, Harplayr is exactly correct. BMW's "Dynamic Cruise Control" uses the vehicle's brakes when necessary (when going down a steep hill), OR when you make a large change in the speed setting while cruise control is active. If you're traveling a a constant speed, and make a downward change of 5 mph or more, it VERY apparent that the brakes are being applied.
BMW's Active Cruise Control (not available on the X3 yet) uses a forward facing radar beam to apply the brakes if you get too close to the vehicle in front and to maintain speed tracking of a vehicle at a constant distance. You can confirm the operational difference of DCC by driving at a constant speed and then: 1. Shutting off the cruise control completely by hitting the "cruise on-off" button. The car will loose speed "slowly' and coast. This is what "plain ole cruise controls" do. 2. Leaving the cruise control on, and lowering the speed setting by, say 15 mph. The car will brake and will loose speed rapidly until it reaches a speed of about 3 mph higher than the new setting. The brakes will then release and the car will stabiliize at the new speed setting smoothly. This is "Dynamic" (DCC) since it controls speed using more than just engine braking. Since the X3 already has an electronically operated parking brake system, DCC is an inexpensive add-on. On the other hand, ACC requires a very reliable, narrow beam radar system and an additional processor, so commands a substantial additional cost to implement. CRUISE ON! Last edited by Lotus7; 05-27-2011 at 11:03 AM.. |
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