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 22 2005, 02:48 AM
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specialist Group: Membri Posts: 584 Joined: 28-June 05 From: Bucuresti Member No.: 50.007 |
QUOTE(Iulian HondaFan) Valentin, ce inseamna performant?
iata ca Legacy GT cu 250CP este mai rapid decat A4 quattro cu 255CP? este intr-adevar mai sigur pentru ca are ESP... Iulian, am mai spus. Diferentele dintre doua masini nu sunt justificate doar in diferentele constructive ale celor doua transmisii. Nu este corect sa compari un motor turbo cu unul aspirat. Principalul avantaj al motorului turbo il constituie netezirea curbei de cuplu pe intreaga turatie disponibila, precum si disponibilitatea cuplului la turatii joase. De aici diferentele. Daca nu ma crezi, uitat-te la diferentele de performante intre: Audi A4 3123 cc aspirat 255 CP 330 Nm 0-100: 6,4 s 1540 Kg Legacy 3000 cc aspirat 245 CP 297 Nm@4200 0-100: 6,9 s 1515 Kg Legacy 2.5 l turbo 250 CP 340 Nm 0-100: 5.9 s (eu nu am gasit pe situl lor. Oare nu scrie?) 1495 Kg. Sunt 5 CP diferenta intre Legacy 2.5 turbo si Legacy3.0 aspirat. Cum explici diferenta de 1 secunda intre cele doua modele, prin 40 Nm? Deci Audi are in plus fata de 3.0 10 CP si 33 Nm - dar este mai perf. cu 0,5 s 2,5 turbo are in plus 5 CP si 43 Nm - dar este mai perf. cu 1 s. Oare este meritul transmisiei sau al motorului turbo? D.p.d.v. al transmisiei, quattro este mai performant. Am adus suficiente argumente. daca doresti mai putem continua . Quattro de pe A4 nu reprezinta ultima generatie. S4/RS4 benefeciaza de ultima generatie. Nu luam in considerare pretul, inainte de a porni aceatsa dicutie voi toti considerat ca AWD-ul lui Subaru "smoke" quattro. Ei bine nu e asa nici macar cu penultima generatie de quattro... -------------------- Audi A4 130CP - 2002
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