Sisteme AWD, care e cel mai bun? |
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Sisteme AWD, care e cel mai bun? |
Jun 4 2005, 02:14 PM
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specialist Group: Membri Posts: 4.583 Joined: 30-May 04 From: Honda World Member No.: 26.577 |
In 1980, Audi introduced the world to full-time all-wheel drive to volume-produced passenger cars. It was called quattro. Now in its fourth generation, Audi's quattro® permanent all-wheel drive directs power where and when it's needed. Under ideal conditions power is split 50/50 front to rear. But in extreme cases up to 67% of the engine's power can be directed to a single wheel. The benefits to the driver are safety, performance, power, and control in copious amounts. When cornering, all four wheels of a car must cover varying distances. The task of the center differential is to compensate for the differences between front and rear axles, and to distribute engine power between front and rear wheels. The center differential is the heart of Audi's permanent all-wheel driveline. Depending on the driving situation and road conditions, the system automatically regulates the distribution of power within milliseconds. This takes place by means of either (depending on model) the Torsen; differential, Haldex™ clutch, or hydraulic multi-plate clutch. Influencing parameters in the control process include engine speed and torque, wheel spreads, and longitudinal and lateral acceleration. The division of propulsive power between all four wheels is the basis of the excellent handling and safety of Audi models with quattro. The potential of this drive concept is further optimized by a series of control systems for brake and engine management: The Anti-lock Brake System (ABS) Electronic Brake-force Distribution (EBD) Electronic Differential Lock (EDL) Anti-Slip Regulation (ASR) All of the above assist in increasing traction when accelerating or braking. Furthermore, when cornering, the standard Electronic Stabilization Program (ESP) increases directional stability by comparing target and actual physical driving forces. The locking function of the center differential and the Electronic Differential Lock make sure that an Audi with quattro; all-wheel drive can still pull away with only one wheel able to transfer engine power to the road. Here's how it works: If one of the wheels on an axle loses grip and starts spinning, propulsive power has to be diverted to the other wheel by the axle's differential. Previously, a mechanical differential lock enabled this to take place. Now, the Electronic Differential Lock has replaced the mechanical lock, effectively transferring the excess power of the spinning wheel to the other wheels with better traction. On an Audi with quattro, if both wheels on an axle start spinning, the continuously controlled locking of the center differential ensures that most of the torque is transmitted to the other axle. In this way, propulsion is guaranteed in almost all situations. On an Audi with quattro, if both wheels on an axle start spinning, the continuously controlled locking of the center differential ensures that most ( adica 67%) of the torque is transmitted to the other axle. In this way, propulsion is guaranteed in almost all situations. dupa audiusa.com --------------------------------------------- cineva spunea ca diferenta intre 4motion si quattro este Haldex vs. Torsen. Se pare ca e inexact. Torsen este folosit pentru transmisia de la motoare dispuse longitudinal in timp ce Haldex este folosit pt. motoare dispuse transversal. -------------------- Civic Si 2007 2.0l DOHC iVTEC
Acura TL 2006 3.2l SOHC VTEC |
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Nov 20 2005, 08:45 PM
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Subaru Anti-Hero Group: Moderator Posts: 5.323 Joined: 13-May 04 From: F 1 World Member No.: 25.368 |
QUOTE(Iulian HondaFan) la xi trebuie sa fie o eroare. nu se poate fara un diferential central...
deci A4 quattro este tot cu diferentiale deschise fata-spate. http://craveonline.com/garage/models.php/3-Series QUOTE All-wheel-drive system
BMW's all-wheel-drive system is a full-time four-wheel-drive system that sends 62% of the engine's power to the rear wheels and 38 percent to the front wheels, all the time. By sending more power to the rear wheels, this kind of system minimizes the effects of torque steer on the front wheels, improving steering control. And because the 330xi is based on a rear-wheel-drive vehicle, its front to rear weight distribution remains about 50/50 even with the all-wheel-drive system, which contributes to balanced handling and vehicle dynamics. To improve traction and stability, the 330xi uses a complicated computer-controlled system that selectively and automatically operates individual brakes instead of using conventional differential locks to transfer engine torque from front to rear or from side to side. To stabilize the car on its vertical axis (prevent spin-outs), the 330xi uses BMW's sophisticated Dynamic Stability Control system (DSC-X) (standard with all-wheel drive models) which monitors individual wheel speed, steering wheel angle and vehicle direction. If it senses oversteer or understeer, such as when entering a curve too quickly, DSC-X selectively applies the brakes, or reduces engine power to help keep the car under control. To prevent wheelspin at any wheel, the Automatic Differential Brake component of DSC-X detects slip at any of the four wheels and brakes the wheel that is spinning, thereby redirecting torque to the wheels with more grip. And to prevent the driving wheels from spinning on slippery surfaces, the Automatic Stability Control reduces wheelspin on the driving wheels by moderating engine power and applying the brakes. If you think this sounds complicated, it is! But to the driver, the AWD system operates invisibly, acting only when it's needed automatically. http://www.canadiandriver.com/testdrives/01bmw330xi.htm Pai nu este nici un mistake. BMW Xi AWD rullzzzzz ! Electronics > > > Mechanical -------------------- Schumi drive it like you stole it !
2005 Subaru Legacy GT ; 2009 Subaru Forester XP ; 2014 Jeep Grand Cherokee |
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