Sisteme AWD, care e cel mai bun? |
This topic is about Sisteme AWD, care e cel mai bun?, the author, , wrote about: ... To read more just scroll down
Sisteme AWD, care e cel mai bun? |
Jun 4 2005, 02:14 PM
Post
#1
|
|
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 |
|
|
Nov 22 2005, 01:07 AM
Post
#2
|
|
specialist Group: Membri Posts: 4.583 Joined: 30-May 04 From: Honda World Member No.: 26.577 |
QUOTE(Valentin50014) Adica exact ceea ce faceau ceilalti, numai ca aici Subaru este din nou inaintea tuturor. Ceea ce "uita" ei sa spuna este ca fragmentul al doilea este valabil doar cu cutie automata (ma rog, este o steluta acolo). Daca in primul caz critica concurenta, in cel de-al doilea caz aduce elogii unui sistem care nu functioneaza decat cu cutie automata, asta in timp ce concurenta ofera acelasi lucru cu ambele transmisii. Adica noi suntem mai tari decat oricine ca oferim ESP pe transmisii automate, in timp ce ceilalti sunt slabi ca folosesc electronica. Pai ce, ESP-ul de pe Subaru e mecanic? Cum ramane cu AWD-ul concuretei compatibil cu cutiile manuale?
Pana la urma intelegi cat de usor poti fi pacalit de marketing? cred ca la imposibilitatea tehnica de a dota Symmetrical AWD cu VSC ai dreptate. ma intreb daca este chiar posibil sa folosesti VDC cu LSD? prob ca da dar fara a avea o functie de EDL care este superflua si cumva imposibila ( pe masura ce franezi mai mult o roata LSD-ul iti va trimite si mai mult. cuplu)... referitor la "imperfectiunea" symmetrical AWD al Subaru intr-adevar testerii din USA ( dar si f1anatic in discutia cu mine) au sesizat ca Legacy GT are tendinta de a "fugi de fund" ( "slide the tail"). asta nu se intampla la un vehicul cu ESP/VDC/cum-s-o-mai-chema. asta este insa un avantaj pe circuitele de raliu dar un dezvantaj in viata de zi cu zi cu soferi obisnuiti. totusi cine isi cumpara un Legacy GT este un pasionat ( si da, cred ca este un cunoscator cu buget limitat) si se poate instrui sa isi cunoasca limitele masinii si folosi acest fenomen in avantajul sau... oricum ne-am uita Legacy-ul GT este o masina deosebita, originala si cu performante exceptionale chiar comparat cu masini mult mai scumpe... -------------------- Civic Si 2007 2.0l DOHC iVTEC
Acura TL 2006 3.2l SOHC VTEC |
|
|
Lo-Fi Version | Time is now: 9th May 2024 - 01:28 AM |