Dear All,I have a question to ask. I have a E90 323i.1. Is DTC automatically turned OFF all the time, until its activated?2. When I hit on the DTC button, I receive a message on the i-drive that says "DTC Activated, DSC restricted".What does DSC restricted mean, and why is it restricted?
Activating DTC
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BlackE90
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Bro, here is the DTC & DSC features explained by BMW.
Dynamic Traction Control (DTC)
Dynamic Traction Control (DTC) allows for sports-style driving dynamics even when DSC is controlling stability and when wheel traction is higher.
Dynamic Traction Control (DTC) is a sub-function of the Dynamic Stability Control (DSC) system that can be turned on and off. DTC has two major uses: to regulate traction and to enable sports-style driving while providing active stability control.
If the front wheels are stuck in snow and cannot spin properly, this leads to slip on the rear wheels (when they spin faster than the front wheels, generally a sign that performance has been exceeded) and DSC acts to change engine output: the power needed for forward movement is reduced. Switching to DTC has a positive effect on this situation, as traction is improved without a loss of power.
When DTC is on, it helps the driver alleviate the situation enough for DSC's measures to become effective. The driver retains complete control over the vehicle.
Dynamic Stability Control (DSC).
Dynamic Stability Control (DSC) adds to safety by facilitating vehicle control even in adverse driving conditions or on tough surfaces.
Dynamic Stability Control (DSC) is the nucleus of the chassis control systems in BMW vehicles. It ensures the highest possible levels of stability when driving, and it maximizes traction of all wheels when setting off or accelerating. It is able to detect the first signs of oversteering or understeering and helps keep the vehicle safely on course, even if the tyres have varying levels of grip.
Sophisticated sensors permanently check how the vehicle is driving. Information comes a range of sensors monitoring wheel rotation, steering angle, lateral forces, pressure and yaw (degree of rotation around the vertical axis). A simulation model stored in the DSC control unit to ensure stability ("one-/two-track model") and can be compared information coming from the steering wheel and accelerator: if there is too great a difference between the model and how the vehicle is currently travelling, DSC acts to increase stability or traction.
The engine and brake management systems are targeted specifically; xDrive is also included in all-wheel drive vehicles. Reducing or increasing the engine torque or braking individual wheels can improve stability and traction. Active Steering’s integrated yaw regulation system can even help significantly reduce steering effort and the extent of DSC’s contribution to stability."
Dynamic Traction Control (DTC)
Dynamic Traction Control (DTC) allows for sports-style driving dynamics even when DSC is controlling stability and when wheel traction is higher.
Dynamic Traction Control (DTC) is a sub-function of the Dynamic Stability Control (DSC) system that can be turned on and off. DTC has two major uses: to regulate traction and to enable sports-style driving while providing active stability control.
If the front wheels are stuck in snow and cannot spin properly, this leads to slip on the rear wheels (when they spin faster than the front wheels, generally a sign that performance has been exceeded) and DSC acts to change engine output: the power needed for forward movement is reduced. Switching to DTC has a positive effect on this situation, as traction is improved without a loss of power.
When DTC is on, it helps the driver alleviate the situation enough for DSC's measures to become effective. The driver retains complete control over the vehicle.
Dynamic Stability Control (DSC).
Dynamic Stability Control (DSC) adds to safety by facilitating vehicle control even in adverse driving conditions or on tough surfaces.
Dynamic Stability Control (DSC) is the nucleus of the chassis control systems in BMW vehicles. It ensures the highest possible levels of stability when driving, and it maximizes traction of all wheels when setting off or accelerating. It is able to detect the first signs of oversteering or understeering and helps keep the vehicle safely on course, even if the tyres have varying levels of grip.
Sophisticated sensors permanently check how the vehicle is driving. Information comes a range of sensors monitoring wheel rotation, steering angle, lateral forces, pressure and yaw (degree of rotation around the vertical axis). A simulation model stored in the DSC control unit to ensure stability ("one-/two-track model") and can be compared information coming from the steering wheel and accelerator: if there is too great a difference between the model and how the vehicle is currently travelling, DSC acts to increase stability or traction.
The engine and brake management systems are targeted specifically; xDrive is also included in all-wheel drive vehicles. Reducing or increasing the engine torque or braking individual wheels can improve stability and traction. Active Steering’s integrated yaw regulation system can even help significantly reduce steering effort and the extent of DSC’s contribution to stability."
astroboy
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Still don't understand the details but by default, DSC is activated every time we start the car and very potong steam when u want to throw the car around. It keeps shutting off the engine and u can't pedal out of a drift.
DSC is the ultimate technology today for stability control.. but if u think its too potong steam, u can shut it off for some adrenalin rushed spirited drive. Press and hold the DTC button located under the central dash vent until u see an amber triangle illuminated on the meter cluster. That means the stability control are totally shut off! U receive no electronic driving aid when car lose control.. so be careful especially on the wet!
If press the DTC button once, instead of hold, u will see DTC illumination on your OBC. As explained in the above write up, DTC is part of DSC or so called restricted DSC and to my understanding, its more suitable for driving on icy road surface.
This is my personal interpretation, imagine a situation where car is moving up an icy slope. Front wheel may or may not spin due to the slippery surface and when gas pedal is depressed, it send our rear wheel spinning like crazy with front wheel spinning at a much slower speed. DSC will acknowledge the situation and try to rectify the spinning rear wheel by apply rear brake or cut engine power. I think u can never get your E90 up an icy slope with DSC on. This is where DTC is most useful because it allow some degree of slippage to the rear wheel to move the car up the icy slope gently compare to DSC that keep cutting engine power and apply rear brake to prevent rear wheel from spinning and u'll be stuck with no drive to the rear wheel.. I think.. never experience the situation here in KL..
The key word for DTC is "DTC is a version of DSC optimized for particular road conditions... like.. snow covered road.. it allows greater degree of slippage on the wheel.. "
Another clip, non English but has Chinese interpretation with the same meaning as the above clip on describing DTC..
The following explains a lot better.. Ignore the first two.. hehe..
[video=youtube;tI94V0vFEv0]http://www.youtube.com/watch?v=tI94V0vFEv0&NR=1"]http://www.youtube.com/watch?v=tI94V0vFEv0&NR=1[/video]
Conclusion: when u see snow on the road, hit the DTC/DSC button once to activate DTC.. :wink:
DSC is the ultimate technology today for stability control.. but if u think its too potong steam, u can shut it off for some adrenalin rushed spirited drive. Press and hold the DTC button located under the central dash vent until u see an amber triangle illuminated on the meter cluster. That means the stability control are totally shut off! U receive no electronic driving aid when car lose control.. so be careful especially on the wet!
If press the DTC button once, instead of hold, u will see DTC illumination on your OBC. As explained in the above write up, DTC is part of DSC or so called restricted DSC and to my understanding, its more suitable for driving on icy road surface.
This is my personal interpretation, imagine a situation where car is moving up an icy slope. Front wheel may or may not spin due to the slippery surface and when gas pedal is depressed, it send our rear wheel spinning like crazy with front wheel spinning at a much slower speed. DSC will acknowledge the situation and try to rectify the spinning rear wheel by apply rear brake or cut engine power. I think u can never get your E90 up an icy slope with DSC on. This is where DTC is most useful because it allow some degree of slippage to the rear wheel to move the car up the icy slope gently compare to DSC that keep cutting engine power and apply rear brake to prevent rear wheel from spinning and u'll be stuck with no drive to the rear wheel.. I think.. never experience the situation here in KL..
The key word for DTC is "DTC is a version of DSC optimized for particular road conditions... like.. snow covered road.. it allows greater degree of slippage on the wheel.. "
Another clip, non English but has Chinese interpretation with the same meaning as the above clip on describing DTC..
The following explains a lot better..
Ignore the first two.. hehe.. [video=youtube;tI94V0vFEv0]http://www.youtube.com/watch?v=tI94V0vFEv0&NR=1"]http://www.youtube.com/watch?v=tI94V0vFEv0&NR=1[/video]
Conclusion: when u see snow on the road, hit the DTC/DSC button once to activate DTC.. :wink:
