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, 11:14 AM
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specialist Group: Membri Posts: 584 Joined: 28-June 05 From: Bucuresti Member No.: 50.007 |
QUOTE(Iulian HondaFan) 5.7sec 0-60mph este timpul obtinut de car&driver si de motor trend. In USA f. putini producatori pun acceleratiile pe site-urile lor. Mai inainte spuneai ca scoate 5.9, acum ai gasit un test in care scoate mai putin? Cand compar timpii 0-100 eu ma iau dupa datele anuntate de producator.
QUOTE(Iulian HondaFan) chiar si ultima generatie de quattro nu mi se pare chiar asa de convingatoare. sa luam etalonul BMW ( care nu prea e batut de nimeni la rapiditatea masinilor sale la un nr. x de CP):
de ex. RS4 cu 418CP accelereaza numai marginal mai rapid fata de BMW M3 cu numai 333CP. Legacy GT accelereaza la fel de rapid ca un BMW 330i cu 255CP... M3 5,2 RS4 4,8 Oricum, pentru mine aceste comparatii nu au nici o valoare. Repet pentru ultima data: Performantele unei masini depind de foarte multi factori. Vad ca tu nu iei in considerare greutatea, CV etc. Eu am comparat aici sistemul de transmisie quattro cu sisteme similare. M-urile au transmisie integrala? QUOTE(Iulian HondaFan) parerea mea e ca la banii dati Subaru ofera performante pe care la Audi le iei cu 3-5K mai mult ( nu neg ca banii nu se merita, prob ca da pentru ca sunt si elementele de comfort si rafinament unde indiscutabil Audi "delivers"). Si ce legatura este intre acest topic si ceea ce spui tu aici? Probabil ai dreptate, dar aici discutam de performanta AWD si atat. Asa cum se spunea in unul din link-uri, necitit probabil, Torsen este cel mai performant dar si cel mai scump. Probabil LSD-ul de pe Subaru are un raport calitate/pret mai bun, dar nu mai intereseaza acest aspect in acest context...
@f1anatic: parerea ta reprezinta un exemplu de ipocrizie transferata de la marca adulata, la tine. Ieri BMW-ul (Haldex-ul si, probabil, multi altii) erau niste fraieri care nu erau in stare sa faca un sistem AWD fara electronica si azi, dintr-o data, Subaru realizeaza ceva magnific, o adevarata opera de arta asistata electonic. Imi insiri o serie de cuvinte care habar n-ai ce reprezinta, amesteci diferite tipuri de diferentiale intre ele si ma contrazici la fiecare pas si total aiurea. Nu exista post de-al tau in care sa nu aduci vorba de masina saracului, BMW si Audi rulz, tractoare (cum le-ai adus in discutie vis-a-vis de Legacy GT, nu stiu), sisteme fraiere etc. Acestea sunt ultimele mele cuvinte care iti sunt adresate tie pe acest forum... pentru multa vreme de acum inainte. Interventia mea s-a vrut oportuna pentru a va mai domoli elanul "fanatic" de a considera celelalte sisteme AWD depasite de capodopera Subaru. In celelalte incluzand Audi, BMW, Lexus, Mazda, Ford etc care folosesc torsen sau ceva echivalent AWD (ex. BMW) P.S. Apropo, cate STI-uri au ESP standard sau optional? Aha, inteleg. Nu e nevoie... later edit: am editat postul pentru a corecta cateva greseli de exprimare. -------------------- Audi A4 130CP - 2002
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