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| [#1] Haldex Traction To those interested, read http://www.borgwarner.com/en/Products/Pages/Product-Detail-Search.aspx?k=%20&r=productfamily%3D%22Haldex%C2%AE%20FWD/AWD%20Systems%22%20businessunit%3D%22Drivetrain%20Systems%22 Looks like Gen5 is a bit backwards in technology...... 最後修改時間: 2014-03-02 15:15:15 |
anon99 正式會員116.xxx.xxx.18 |
2014-03-02 15:14 | |
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| [#2] Haldex Traction Tried a bit of search on the web, and looks like Piston Head and Audi-Sport.net had good discussions on the Haldex on Audi S3. Some observations:- - Audi used Gen IV since 2008/2009 on 2nd generation S3. - Audi skipped Gen III Haldex and migrated direct from Gen II to Gen IV - Gen IV onwards the software of the Haldex ECU can be customised to suit different manufacturers - Gen IV and Gen V is basically the same, expect Gen V has less hydraulic components, and lighter - Starting from Gen IV, Audi called it "permanent AWD" since the rear axle is never disengaged - The default torque split is 85/15 (Front/rear) - Gen V can shift 100% of torque either front or rear, if required. The above are just "recaps" so it may not be 100% true. |
fkclo 正式會員 42.xxx.xxx.69 |
2014-03-02 16:31 |
| [#3] Haldex Traction ozaudi.com forum seemed to confirm the 2014 S3 uses the Haldex V. |
fkclo 正式會員 42.xxx.xxx.69 |
2014-03-02 17:08 |
| [#4] Haldex Traction It is pretty sure the new (2015) TT will use the latest Haldex with specially developed software. For Audi Media: In the new Audi TT, quattro permanent all-wheel drive delivers additional stability, traction and driving fun. It has been consistently advanced and optimized especially for the new TT. Its electro-hydraulically controlled multi-plate clutch is mounted on the rear axle. The special pump design reduces weight by around 1.5 kg (3.31 lb) compared with the previous model. The distribution of drive torque between the axles is controlled electronically within fractions of a second. The intelligence of quattro drive – in other words, the software that determines precisely the possible torque distribution between the front and rear axles – is a completely new development especially for the TT. The innovative control philosophy continuously senses the ambient conditions, driving status and the driver’s wishes. This means that the ideal distribution of torque is calculated and the TT’s dynamic drive characteristics enhanced in every situation. By networking quattro drive with Audi drive select, the driver of the new Audi TT can adjust the all-wheel-drive properties to suit his or her individual requirements. In “auto” mode, this produces optimum traction and balanced driving dynamics. In “dynamic” mode, torque is distributed to the rear axle earlier and to a higher degree, which means that driving dynamics are enhanced further, especially on surfaces with low friction coefficients. Alongside optimizing the driving dynamics, the advances made to quattro drive also focused on the subject of efficiency. In the drive select “efficiency” mode the torque distribution is adjusted to optimize the level of efficiency. Determining driving conditions and driver type precisely allows for efficiency-optimized all-wheel-drive control – which can even result in the temporary shutdown of the quattro drive system. In this operating state, the intelligent software carefully monitors the driving situation and activates the all-wheel drive before torque is once again required at all four wheels. In this way, quattro drive provides optimum efficiency along with a level of traction and dynamic handling that is typically quattro. |
fkclo 正式會員 42.xxx.xxx.69 |
2014-03-04 16:41 |
| [#5] Haldex Traction With 電子制御4WD there're always tricks like the aforementioned "Efficiency-optimised" 4WD = on-demand 4WD =/= Instant Traction No wonder on the product page the Gen5 transfer case only has the [optimised for] "passenger car" logo but not the "light truck" logo ＞ which can even result in the temporary shutdown of the quattro drive system Now that sounds disturbing When does the 4WD shut down? During braking, ABS intervention (as in all previous cases)?... But anyway, a press release is just a press release, it doesn't necessarily explain things to full detail, which is why it's up to the auto press to "scrutinise" the info within 最後修改時間: 2014-03-04 16:52:13 |
anon99 正式會員 116.xxx.xxx.18 |
2014-03-04 16:49 |
| [#6] Haldex Traction I think it means when the Drive Select is switched to efficiency mode, the software will bias more towards FWD to improve fuel efficiency. I read from other sources that the Haldex will be overridden by the car's stability control in extreme conditions. But not sure if this is still the case from the Gen. V. |
fkclo 正式會員 42.xxx.xxx.69 |
2014-03-04 17:09 |
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