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, 02:00 AM
Post
#2
|
|
specialist Group: Membri Posts: 584 Joined: 28-June 05 From: Bucuresti Member No.: 50.007 |
Iulian, in general sunt de acord cu tine, mai putin cu urmatoarele afirmatii...
1. QUOTE(Iulian HondaFan) in concluzie: Torsen al Quattro permite o distributie mai buna a cuplului fata-spate in timp ce STI ( si Legacy GT) permite o distributie mai buna a cuplului stanga dreapta.
Probabil te referi la EDL. Ei bine, EDL se foloseste pe modelele entry-level (asa cum la Subaru pe acelseasi modele se foloseste diferentialele deschise). Pe variantele sportive se intalneste LSD (a nu se confunda cu LSD VC cum este la Subaru). Tu ai comparat modelul de varf de la Legacy cu cel mai slab model de quattro (existent pe Audi). De asemenea, mai sus se mai face o referire la LSD-urile Audi, dar fara vascocuplaj. Vascocuplajul este o solutie excelenta, numai ca induce o mica intarziere si are interfernta aceea cu ABS-ul. 2 QUOTE(Iulian HondaFan) oricum un Legacy GT limited ( cu aprox aceeasi greutate si aceeasi putere) este semnificativ mai rapid ( 5.9sec) decat un A4 quattro 3.2l FSI (255CP) = 6.4 sec si decat un BMW 330xi= 6.4 sec care sunt muuult mai scumpe. e marginal mai putin manevrabil decat un 330xi dar par cu A4-le similar motorizat...
Aici faci aceeasi eroare. Compari cel mai bun Legacy cu un Audi mediu. A4 cu aceasta motorizare nu se vrea un concurent pentru Legacy GT. Un motor aspirat nu se poate compara cu un motor turbo chiar daca performantele sunt apropiate pe hartie. Distributia cuplului la motorul turbo este net favorabila acestuia, de aici avantajul. Incerca sa compari A4 cu motorul de 3.0 l aspirat de la Subaru. Performantele sunt aproximative, Audi are avantaj, dar si 0-100 este superior nemtilor. Repet, A4 nu se poate compara cu Legacy GT... -------------------- Audi A4 130CP - 2002
Panda MultiJet 1,3 |
|
|
Lo-Fi Version | Time is now: 8th May 2024 - 08:21 AM |