Hill descent
07-08-2005, 07:56 AM
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Originally Posted by TitaniumGray5' date='Jul 7 2005, 09:08 PM
[quote name='EBMCS03' date='Jul 7 2005, 05:36 PM'][quote name='A90' date='Jul 7 2005, 02:46 PM']I was on vacation in Italy last month and noticed it to with a e39 2002. You can clearly feel the car braking on the engine by taking a lower gear on steep downhill stretches.
very well done was my idea and wondered weither a kind of gyroscope system is on the car. Anyone knows ? or does the computer calulates the speed * revs * brakes or something.
very well done was my idea and wondered weither a kind of gyroscope system is on the car. Anyone knows ? or does the computer calulates the speed * revs * brakes or something.
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[/quote]Well, the tranny is also designed to not shift in the middle of a corner, so it definitely has some type of left/right G sensor...so it shouldn't be much trouble to have the same thing for forward/back, but not sure.
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[/quote]I remember reading that there are level sensors, which are used in the the engine braking system.
07-08-2005, 04:59 PM
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Here... no gyroscops...
Driving uphill or trailer towing
These functions are based on a comparison of actual car acceleration with a nominal value. From the
current engine operating situation, the acceleration with normal load on a level surface is calculated. If the
actual acceleration is significantly lower than the theoretical value, the function "Driving uphill or trailer
towing" is activated.
The associated shift maps allow a high-revving driving style. Undesirable upshifts and frequent
up/downshifts are eliminated or greatly reduced.
Driving downhill
If the EGS control unit detects downhill driving, it will automatically shift down a gear if the vehicle's speed
picks up. This enhances the engine's braking effect. A downshift is only effected if the engine speed is
below the maximum speed of the lower gear.
The EGS control unit detects downhill driving on the basis of signals from the throttle valve potentiometer
(load), wheel speed sensor (road speed) and brake light switch (brake activation).
? Braking deceleration and automatic upshift
To decelerate the vehicle, the driver takes his foot from the accelerator pedal and applies the brake as
necessary. The gearshift map triggers an upshift when the throttle is closed. These gearshifts are not
needed in conjunction with brake applications as they prevent the engine's braking effect from being
utilised.
The intention to apply the brakes can often be anticipated from the rapid closure of the throttle to zero. If
such an action is detected, the upshift is suppressed for as long as the accelerator pedal is in the zero
position and the vehicle is in overrun mode.
Driving uphill or trailer towing
These functions are based on a comparison of actual car acceleration with a nominal value. From the
current engine operating situation, the acceleration with normal load on a level surface is calculated. If the
actual acceleration is significantly lower than the theoretical value, the function "Driving uphill or trailer
towing" is activated.
The associated shift maps allow a high-revving driving style. Undesirable upshifts and frequent
up/downshifts are eliminated or greatly reduced.
Driving downhill
If the EGS control unit detects downhill driving, it will automatically shift down a gear if the vehicle's speed
picks up. This enhances the engine's braking effect. A downshift is only effected if the engine speed is
below the maximum speed of the lower gear.
The EGS control unit detects downhill driving on the basis of signals from the throttle valve potentiometer
(load), wheel speed sensor (road speed) and brake light switch (brake activation).
? Braking deceleration and automatic upshift
To decelerate the vehicle, the driver takes his foot from the accelerator pedal and applies the brake as
necessary. The gearshift map triggers an upshift when the throttle is closed. These gearshifts are not
needed in conjunction with brake applications as they prevent the engine's braking effect from being
utilised.
The intention to apply the brakes can often be anticipated from the rapid closure of the throttle to zero. If
such an action is detected, the upshift is suppressed for as long as the accelerator pedal is in the zero
position and the vehicle is in overrun mode.
07-08-2005, 05:08 PM
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But maybe a QRS11 gyro for this... 
Sorry if you didnt understand that.. but if you follow the news you would know.
Cornering detection
Cornering detection reacts to the vehicle's lateral acceleration with an indirect adaptation to the driver
type. Lateral acceleration is considered an indirect statement of the preferred driving dynamics and does
not cause an immediate gearshift reaction (downshifts when cornering could negatively affect driving
stability).
The lateral acceleration is calculated by means of signals from the wheel speed sensors on the front and
rear axles and from the yaw rate and the road speed.
Sorry if you didnt understand that.. but if you follow the news you would know.
Cornering detection
Cornering detection reacts to the vehicle's lateral acceleration with an indirect adaptation to the driver
type. Lateral acceleration is considered an indirect statement of the preferred driving dynamics and does
not cause an immediate gearshift reaction (downshifts when cornering could negatively affect driving
stability).
The lateral acceleration is calculated by means of signals from the wheel speed sensors on the front and
rear axles and from the yaw rate and the road speed.
07-08-2005, 05:47 PM
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Originally Posted by EBMCS03' date='Jul 8 2005, 06:08 PM
But maybe a QRS11 gyro for this...? ? ? ? ? ?
Sorry if you didnt understand that.. but if you follow the news you would know.?
Cornering detection
Cornering detection reacts to the vehicle's lateral acceleration with an indirect adaptation to the driver
type. Lateral acceleration is considered an indirect statement of the preferred driving dynamics and does
not cause an immediate gearshift reaction (downshifts when cornering could negatively affect driving
stability).
The lateral acceleration is calculated by means of signals from the wheel speed sensors on the front and
rear axles and from the yaw rate and the road speed.
? ? ? ? ? Sorry if you didnt understand that.. but if you follow the news you would know.?
Cornering detection
Cornering detection reacts to the vehicle's lateral acceleration with an indirect adaptation to the driver
type. Lateral acceleration is considered an indirect statement of the preferred driving dynamics and does
not cause an immediate gearshift reaction (downshifts when cornering could negatively affect driving
stability).
The lateral acceleration is calculated by means of signals from the wheel speed sensors on the front and
rear axles and from the yaw rate and the road speed.
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07-08-2005, 05:51 PM
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Originally Posted by PKandCK' date='Jul 8 2005, 06:47 PM
What he said!
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07-09-2005, 08:02 AM
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This behavior is definitely not HDC. HDC slows the car to 7 MPH... Quoted from the 2006 manual:
"Hill Descent Control on 525xi, 530xi
The concept
HDC is a system for driving downhill in steep terrain. This system reduces vehicle speed on steep downhill gradients, thus allowing you to mainain an even better control of your BMW under these conditions. The vehicle moves at approximately twice walking speed without active intervention from the driver.
HDC is available for activation at vehicle speeds below approx. 22 mph/35 km/h. When driving down steep hills with a speed below approx. 22 mph/35 km/h, the vehicle reduces speed automatically down to approximately double walking speed, approx. 7 mph/12 km/h, and then maintains this speed at a constant.
You can use the accelerator or brakes to vary the automatically controlled speed within a range extending from approx. 3 mph/5 km/h to 15mph/25km/h. You can specify a target range using the lever of the cruise control."
It goes on and on about the various options to enable it - through the programmable buttons, through iDrive, and under what conditions it disengages. It also covers some instrument display items specific to HDC.
"Hill Descent Control on 525xi, 530xi
The concept
HDC is a system for driving downhill in steep terrain. This system reduces vehicle speed on steep downhill gradients, thus allowing you to mainain an even better control of your BMW under these conditions. The vehicle moves at approximately twice walking speed without active intervention from the driver.
HDC is available for activation at vehicle speeds below approx. 22 mph/35 km/h. When driving down steep hills with a speed below approx. 22 mph/35 km/h, the vehicle reduces speed automatically down to approximately double walking speed, approx. 7 mph/12 km/h, and then maintains this speed at a constant.
You can use the accelerator or brakes to vary the automatically controlled speed within a range extending from approx. 3 mph/5 km/h to 15mph/25km/h. You can specify a target range using the lever of the cruise control."
It goes on and on about the various options to enable it - through the programmable buttons, through iDrive, and under what conditions it disengages. It also covers some instrument display items specific to HDC.
07-09-2005, 06:38 PM
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I saw the HDC screen on my 06 525Xi today.
It is there.
It is there.
07-09-2005, 08:14 PM
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Originally Posted by phototalk123' date='Jul 9 2005, 07:38 PM
I saw the HDC screen on my 06 525Xi today.
It is there.
It is there.
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WOW thats nice...
So the Xi's have it!
07-11-2005, 07:22 AM
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Originally Posted by EBMCS03' date='Jul 9 2005, 11:14 PM
[quote name='phototalk123' date='Jul 9 2005, 07:38 PM']I saw the HDC screen on my 06 525Xi today.
It is there.
It is there.
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WOW thats nice...
So the Xi's have it![snapback]147443[/snapback]
[/quote]Right, they're the only models thus far. This coincides with the 2006 manual.
07-11-2005, 10:50 AM
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Originally Posted by UUronL' date='Jul 11 2005, 07:22 AM
[quote name='EBMCS03' date='Jul 9 2005, 11:14 PM'][quote name='phototalk123' date='Jul 9 2005, 07:38 PM']I saw the HDC screen on my 06 525Xi today.
It is there.
It is there.
[snapback]147420[/snapback]
WOW thats nice...
So the Xi's have it![snapback]147443[/snapback]
[/quote]Right, they're the only models thus far. This coincides with the 2006 manual.
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[/quote]So who's going to be the first to take a 5 Xi off roading?
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