Corriere della Sera
The Corriere della Sera is an Italian daily newspaper published in Milan with an average daily circulation of 410,242 copies in December 2015. First published on 5 March 1876, Corriere della Sera is one of Italy's oldest newspapers and is Italy's most read newspaper, its masthead has remained unchanged since its first edition in 1876. It reached a circulation of over 1 million under editor and co-owner Luigi Albertini, 1900-1925, he was a strong opponent of Socialism, of clericalism, of Prime Minister Giovanni Giolitti, willing to compromise with those forces. Albertini's opposition to the Fascist regime forced the other co-owners to oust him 1925. Today its main competitors are Turin's La Stampa. Corriere della Sera was first published on Sunday 5 March 1876 by Eugenio Torelli Viollier. In 1899 the paper began to offer Domenica del Corriere. In the 1910s and 1920s, under the direction of Luigi Albertini, Corriere della Sera became the most read newspaper in Italy, maintaining its importance and influence into the present century.
It was Corriere della Sera which introduced comics in Italy in 1908 through a supplement for children, namely Corriere dei Piccoli. The newspaper's headquarters has been in the same buildings since the beginning of the 20th century, therefore it is popularly known as "the Via Solferino newspaper" after the street where it is still located; as the name indicates, it was an evening paper. During the fascist regime in Italy Corriere della Sera funded the Mussolini Prize, awarded to the writers Ada Negri and Emilio Cecchi among the others. Mario Borsa, a militant anti-fascist, was appointed the editor-in-chief of Corriere della Sera in May 1945, he was fired because of his political leanings in August 1946 and was replaced by Guglielmo Emanuel, a right-wing journalist. Emanuel served in the post until 1952. In the 1950s Corriere della Sera was the organ of the conservative establishment in Italy and was anti-communist and pro-NATO; the paper was functional in shaping the views of the Italian upper and middle classes during this period.
The owners of the Corriere della Sera, the Crespi family, sold a share to RCS Media in the 1960s and was listed in the Italian stock exchange. Its main shareholders were Mediobanca, the Fiat group and some of the biggest industrial and financial groups in Italy. In 1974 the RCS Media moved on to control the majority of the paper. Alberto Cavallari was the editor-in-chief of the paper during the early 1980s. In 1981 the newspaper was laterally involved in the P2 scandal when it was discovered that the secret Freemason lodge had the newspaper's editor Franco Di Bella and the former owner Angelo Rizzoli on its member lists. In September 1987 the paper launched a weekly magazine supplement, the first in its category in Italy. From 1987 to 1992 the editor-in-chief of Corriere della Sera was Ugo Stille; the 1988 circulation of Corriere della Sera was 715,000 copies, making it the second most read newspaper in Italy. The paper started its Saturday supplement, IO Donna, in 1996. In 1997 Corriere della Sera was the best-selling Italian newspaper with a circulation of 687,000 copies.
Corriere della Sera had a circulation of 715,000 copies in 2001. In 2002 it fell to 681,000 copies. In 2003, its editor Ferruccio de Bortoli resigned from the post; the journalists and opposition politicians claimed the resignation was due to the paper's criticism of Silvio Berlusconi. In 2004, Corriere della Sera launched an online English section focusing on Italian current affairs and culture; the same year it was the best-selling newspaper in Italy with a circulation of 677,542 copies. Its circulation in December 2007 was 662,253 copies, it is one of the most visited Italian-language news websites, attracting over 1.6 million readers every day. The online version of the paper was the thirteenth most visited website in the country. On 24 September 2014 Corriere della Sera changed its broadsheet format to the Berliner format; the "Third Page" used to feature a main article named Elzeviro, which over the years has published contributions from all the editors as well as major novelists and journalists.
On Monday, Corriere is published along with a weekly finance and business magazine. On Thursday, it is published with a current events magazine. On Sunday, it is published along with a weekly literary supplement; the Italian novelist Dino Buzzati was a journalist at the Corriere della Sera. Other notable contributors include Eugenio Montale, Curzio Malaparte, Gabriele D'Annunzio, Enzo Bettiza, Italo Calvino, Alberto Moravia, Amos Oz, Pier Paolo Pasolini, Guido Piovene, Giovanni Spadolini, Oriana Fallaci, Alessandra Farkas, Lando Ferretti, Brunella Gasperini, Enzo Biagi, Indro Montanelli, Giovanni Sartori, Paolo Brera, Francesco Alberoni, Tracy Chevalier, Goffredo Parise, Sergio Romano, Sandro Paternostro, Alan Friedman, Tommaso Landolfi, Alberto Ronchey and Paolo Mieli. Editors Columnist & Journalists Corriere dei Piccoli a children's supplement of the Corriere della Sera. List of non-English newspapers with English language subsections Media of Italy Merrill, John C. and Harold A. Fisher; the world's great dailies: profiles of fifty newspapers.
Pp. 104–110. Corriere Canadese - the defunct Canadian newspaper where the infamous Vincent C. Torrieri worked. Wwwenglishtraining.it Official website
A coupé or coupe is a two-door car with a fixed roof. In the 21st century there are four-door cars with a coupé-like roofline sold as "four door coupés" or "quad coupés". Coupé was first applied to horse-drawn carriages for two passengers without rear-facing seats; the coupé name is a French language word, the past participle of the verb couper, translating as cut. There are two common pronunciations in English: koo-PAY, the anglicized version of the French pronunciation of coupé. KOOP in American English, due to people spelling the word without the acute accent, which resulted in them pronouncing it as one syllable; this change occurred and before World War II. This pronunciation is more common in the United States, for example the hot rodders' term Deuce Coupe used to refer to a 1932 Ford; the origin of the coupé body style come from the berline horse-drawn carriage. In the 18th century, the coupé version of the berline was introduced, a shortened version with no rear-facing seat. A coupé had a fixed glass window in the front of the passenger compartment.
The term "berline coupé" was shortened to "coupé". The coupé was considered to be an ideal vehicle for women to use to go shopping or to make social visits; the early coupé automobile's passenger compartment followed in general conception the design of horse-drawn coupés, with the driver in the open at the front and an enclosure behind him for two passengers on one bench seat. The French variant for this word thus denoted a car with a small passenger compartment. By the 1910s, the term had evolved to denote a two-door car with the driver and up to two passengers in an enclosure with a single bench seat; the coupé de ville, or coupé chauffeur, was an exception, retaining the open driver's section at front. In 1916, the Society of Automobile Engineers suggested nomenclature for car bodies that included the following: Coupe: An enclosed car operated from the inside with seats for two or three and sometimes a backward-facing fourth seat. Coupelet: A small car seating two or three with a folding top and full height doors with retractable windows.
Convertible coupe: A roadster with a removable coupé roof. During the 20th century, the term coupé was applied to various close-coupled cars. Since the 1960s the term coupé has referred to a two-door car with a fixed roof. Since 2005, several models with four doors have been marketed as "four-door coupés", however reactions are mixed about whether these models are sedans instead of coupés. According to Edmunds, the American online resource for automotive information, "the four-door coupe category doesn't exist." A coupé is a two-door fixed roof car but some manufacturers manage to fit four doors beneath coupe roofs and now describe these cars as four-door coupes. In 1977, International Standard ISO 3833-1977 defined a coupé as having a closed body with limited rear volume, a fixed roof of which a portion may be openable, at least two seats in at least one row, two side doors and a rear opening, at least two side windows. Coupés have been described as "any two-door other than a two-door sedan, smaller than a related four-door in the same model line", "shorter than a sedan of the same model" and that "all two-door two-seaters with a solid roof are coupes."Today, coupé is sometimes used by manufacturers as a marketing term, rather than a technical description of a body style.
This is because coupés in general are seen as more streamlined and sportier overall lines than those of comparable four-door sedans. Automobile manufacturers have therefore begun to use the term loosely, marketing sporty four-door models that feature sloping rooflines as coupés. Manufacturers have used the term "coupé" with reference to several varieties, including: A Berlinetta is a lightweight sporty two-door car with two-seats but including 2+2 cars. A two-door car with no rear seat or with a removable rear seat intended for travelling salespeople and other vendors carrying their wares with them. American manufacturers developed this style of coupe in the late 1930s. A two-door car with a larger rear-seat passenger area, compared with the smaller rear-seat area in a 2+2 body style. Saab uses the term combi coupé for a car body similar to the liftback. A four-door car with a coupé-like roofline at the rear; the low-roof design reduces headroom. The designation, first applied to a low-roof model of the Rover P5 from 1962 until 1973, was revived with the 1985 Toyota Carina ED, the 1992 Infiniti J30 and most with the first model 2005 Mercedes-Benz CLS.
The term originated for marketing reasons. The German press accepted the concept of a four-door coupé and applied it to similar models from other manufacturers such as the 2009 Jaguar XJ. Other manufacturers accepted it, producing recent competing models like Volkswagen Passat CC, BMW F06 and a five-door coupé, the Audi A7; the German automobile club ADAC on its website adopted this concept. In Germany, the definition of the coupé was divided into the classic coupé and 4-door coupé. A two-door designed for driving to the opera with easy access to the rear seats. Features sometimes included a folding front seat next to the driver or a compartment to store top hats, they would have solid rear-quarter panels, with small, circular windows, to enable the occupants to see out without being seen. These opera windows were revived on many U. S. automobiles during the 1970s and early 1980s. A quad coupé is two small rear doors and no B pillar; the three window coupé (commonly jus
Alfa Romeo Stelvio
The Alfa Romeo Stelvio is a front engine, all wheel drive, five door compact luxury crossover SUV manufactured and marketed by the Alfa Romeo subdivision of FCA since debuting at the 2016 Los Angeles Auto Show and entering production at the Cassino Plant at the end of 2016. It is current top Alfa sales with about 43,000 samples per year. Sharing the platform of the mid-size Giulia sedan, the Stelvio uses FCA's Giorgio platform to be shared with Maserati and Jeep; the name Stelvio derives from the Stelvio Pass, Italy's highest mountain pass, noted for its 48 circuitous switchbacks. Preceded by the Kamal concept car in March 2003, the Stelvio is Alfa Romeo's first production SUV, using a modified version of the Giorgio platform shared with the Giulia, available in both rear and all-wheel drive configurations. Alfa Romeo made its first off the Matta, in the 1950s; the sporting trim level of the Stelvio, the Quadrifoglio, was unveiled on 16 November 2016 at the Los Angeles Auto Show. The European versions of the Stelvio were presented at the Geneva Motor Show in March 2017.
The car's engine lineup is similar to that of the Giulia's, with a turbocharged 2.0 litre inline-four and a 2.2-litre diesel inline four. The Quadrifoglio trim level will offer a 2.9 litre twin-turbo V6 rated with 510 PS developed by Ferrari for Alfa Romeo. On January 18, 2017, Alfa Romeo began accepting orders for the Stelvio First Edition in the EMEA region. On November 2, 2017, the Stelvio Quadrifoglio went on sale in Italy. For the model year of 2019, diesel engines of the Stelvio got updates to meet the Euro 6d emission standards, with AdBlue technology introduced to tackle particulates in the exhaust. 150 PS and 180 PS versions got 10 PS more power. In the United Kingdom, all models have now an 8.8 inch infotainment system with Apple Car Play and Android Auto as standard, small tweaks have been made throughout the ranges. In Europe, consumption standards use now WLTP measuring system, which should give more accurate consumption and emission figures. For 2019 Model year Alfa introduced new trim level for Europe the Ti, this is different than Ti version for sale in United States, the Ti has 280 PS 2.0 Turbo Petrol engine, paired with an eight speed automatic transmission, Q4 all wheel drive.
The Stelvio uses the same Giorgio platform used by the Giulia, but modified and raised by 22 cm compared to the sedan. The Stelvio has the same engines and most of the mechanics, including a carbon fiber driveshaft. In addition, compared to the Giulia, its track has increased by 2.9 cm in the rear and 5.4 cm in the front. It has a boot capacity of 525 l, it has a 50/50 weight distribution between the two axles, a drag coefficient of 0.32. To help keep the Stelvio's weight in check, Alfa Romeo uses aluminum for many body parts such as the fenders and tailgate, as well as for mechanical parts such as the suspension, braking system, engine; the suspension, called AlfaLink, implements double wishbones in the front, an aluminum multi-link configuration in the rear. The springs are longer than those in the Giulia, but stiffer to account for the extra weight and ride height; the driver sits 190 mm higher from the road than in the Giulia. Alfa's "Q4" all wheel drive system, rear drive but sends up to 50% of power to the front in low grip conditions, is standard on all trim levels, except an entry level turbo petrol version.
The Stelvio weighs 1,660 kg with fluids, 145 kg less than an equivalent BMW X3 and 110 kg less than a four cyl Porsche Macan. In North America, the Stelvio will be available in three different trim levels: Stelvio, Stelvio Ti and Quadrifoglio. At the 2018 Geneva Motor Show, one limited edition was unveiled NRING edition of the Stelvio; the NRING edition has Carbon ceramic brakes, Sparco carbonfibre seats, carbonfibre interior trim, a Mopar branded gear shifter and Mopar floor mats, the cars are differentiated on the exterior by NRING badges as well as carbonfibre mirror caps and side skirts. Equipment is upgraded to include adaptive cruise control, a premium sound system. In April 2018, NYIAS was unveiled Nero Edizione' Package for Stelvio, a new exterior appearance through special blacked out wheels and other touches; the Nero Edizione package is available only for the 280 horsepower, 2.0 litre model. At the 2019 Geneva International Motor Show, Alfa Romeo Racing limited edition was introduced, which celebrate Alfa Romeo's legendary racing history and the entry of a new Italian driver onto the Formula 1 scene: Antonio Giovinazzi joins the "Alfa Romeo Racing" team with World Champion Kimi Räikkönen.
This special edition has exclusive paintwork, as a tribute to the Alfa Romeo Racing C38 Formula 1 car. It has some stylistic details like some carbon fibre parts and Akrapovič titanium exhaust system; the weight was shaved off about 28 kg from the standard Quadrifoglio version. The diet was backed up by a technical tune-up by Alfa Romeo engineers that has resulted more torque and power, which reaches 520 PS; the Stelvio was crash tested in July 2017 by Euro NCAP, with a score of 97% for the adult occupant protection. Overall, the Stelvio achieved five star results. For adult protection, the Stelvio did "exceptionally well", with its near perfect 97 percent score matching that of the Volvo XC90; the Stelvio is fitted with an autonomous emergency braking system as standard. On 29 September 2017, the Alfa
Fábrica Nacional de Motores
Fábrica Nacional de Motores was a Brazilian manufacturer of engines and motor vehicles based in the Xerém district of Duque de Caxias near Rio de Janeiro that operated between 1942 and 1988. The company was created 1942 by the Brazilian state as part of the Estado Novo agenda of President Getúlio Vargas, it was one of several business launched by the state during this period to kick start an industrial sector in Brazil. The company produced American Curtiss-Wright aircraft engines under license along with ammunition, bicycles and refrigerators. After the Second World War it was decided to diversify production; the government was keen to launch a vehicle manufacturing industry. In 1949 an agreement was reached with the Italian manufacturer, Isotta Fraschini, whereby FNM would produce the Milanese company's heavy trucks under license. Isotta Fraschini commercial vehicles enjoyed an excellent reputation at this time, but the Italian company was economically troubled, although its formal bankruptcy would be put off till the end of 1951.
The disappearance of Isotta Fraschini as a vehicle manufacturer left FNM looking for a new technology partner. In 1952 an agreement was signed with another Milanese vehicle manufacturer. Unusually in Europe, Alfa Romeo was a state owned business, following bankruptcy and a government rescue in the 1930s. Under the agreement with Alfa Romeo, FNM would manufacture Alfa Romeo's commercial vehicle range under license. Though little known north of the Alps, Alfa Romeo commercial vehicles were well established in Italy, other south European markets. Between 1956 and 1960 FNM built more than 15,000 heavy trucks of Alfa Romeo design: it manufactured the chassis for buses and coaches. In the Brazilian heavy truck sector which FNM dominated till the early 1970s, FNM was the only manufacturer. Trucks produced by FNM were nicknamed "Fenemê". In the mid-fifties a company called Fabral S. A. a collaboration between Alfa Romeo and Brazilian investor Matarazzo, was set up to build the Alfa Romeo 2000. The car was to be built in the state of São Paulo.
The Matarazzo Group backed out in 1958, following troubled discussions about the suitability of building luxurious cars in poor Brazil. After pressure from then-President Juscelino Kubitschek FNM, in which Alfa Romeo held a minority interest, took over the project. In 1960 FNM's first passenger car was launched, the FNM 2000, a Brazilian version of the series 102 Alfa Romeo 2000 four-door sedan; the factory ended up being built in the Xerém neighborhood, of Duque de Caxias, Rio de Janeiro instead. The engine was the same 1,975 cc twin camshaft unit found in the Italian product, but detuned to produce only 95 PS and the car received the FNM logo; this series of cars was named "J. K." in honor of President Kubitschek who had helped make the deal take place. This was by far the most luxurious, most expensive, car built in Brazil in the period. A coupé version was offered from 1966. Known as the FNM Onça, the coupé did not follow the line of any Alfa Romeo design, but featured an elegant locally designed body unmistakably reminiscent of the original Ford Mustang.
The regular FNM 2000, was followed by more powerful versions, culminating with the 130 PS TIMB, now boasting usefully more power than was claimed for its Alfa Romeo cousins of the time. The TIMB featured a flat bonnet with a lower-mounted grille, as suggested by Lincoln Tendler aiming a better aerodynamic penetration, a divided front bumper to accommodate the lower centerpiece; this same front design was used for the succeeding FNM 2150, with some detail differences. In 1968 Alfa Romeo acquired a controlling share in the hitherto state-owned FNM business; the next year the FNM 2000 was replaced by a restyled version, the FNM 2150, the most obvious visual differences affecting the front of the car. For this application the twin camshaft four cylinder engine saw its capacity increased to 2132 cc, performance was further enhanced through the installation of a better set of carburetors; the five-speed gearbox was the same one used in all cars made up to that moment. The FNM 2150 would continue in production from 1969 till 1974.
In 1971, another coupé called. Based on chassis and mechanics of the FNM/JK 2150 cc model, the car was designed by Brazilian designer Toni Bianco. Only a few hand built examples were produced, but the stylish coupé may have helped the public image of the by now aging design of the mainstream FNM 2150. Bianco made some sporting creations carrying his own name. Alfa Romeo had disposed of its commercial vehicle operations in Italy in the 1960s, in 1973 the FNM commercial vehicle business was sold to Fiat's industrial vehicle division, while Alfa Romeo retained responsibility for the FNM automobile business – subsequently FNM's commercial vehicle business ended up being absorbed into Fiat's Brazilian Iveco business. 1974 saw the FNM 2150 replaced with the Alfa Romeo 2300. This was the end for the FNM badged cars: the FNM badge itself inspired by the Alfa Romeo badge, was replaced on this car with an actual Alfa Romeo badge; the general look of the new car was similar to that of the Italian built Alfetta sedan, designed by Giuseppe Scarnati and first offered in Europe in 1972, although the Brazilian car was 41 centimetres longer and 7 centimetres wider than the Alfetta.
Under the skin, the 2300 was based technically on the older
A transmission is a machine in a power transmission system, which provides controlled application of the power. The term transmission refers to the gearbox that uses gears and gear trains to provide speed and torque conversions from a rotating power source to another device. In British English, the term transmission refers to the whole drivetrain, including clutch, prop shaft and final drive shafts. In American English, the term refers more to the gearbox alone, detailed usage differs; the most common use is in motor vehicles, where the transmission adapts the output of the internal combustion engine to the drive wheels. Such engines need to operate at a high rotational speed, inappropriate for starting and slower travel; the transmission reduces the higher engine speed to the slower wheel speed, increasing torque in the process. Transmissions are used on pedal bicycles, fixed machines, where different rotational speeds and torques are adapted. A transmission has multiple gear ratios with the ability to switch between them as speed varies.
This switching may be done automatically. Directional control may be provided. Single-ratio transmissions exist, which change the speed and torque of motor output. In motor vehicles, the transmission is connected to the engine crankshaft via a flywheel or clutch or fluid coupling because internal combustion engines cannot run below a particular speed; the output of the transmission is transmitted via the driveshaft to one or more differentials, which drives the wheels. While a differential may provide gear reduction, its primary purpose is to permit the wheels at either end of an axle to rotate at different speeds as it changes the direction of rotation. Conventional gear/belt transmissions are not the only mechanism for speed/torque adaptation. Alternative mechanisms include power transformation. Hybrid configurations exist. Automatic transmissions use a valve body to shift gears using fluid pressures in response to speed and throttle input. Early transmissions included the right-angle drives and other gearing in windmills, horse-powered devices, steam engines, in support of pumping and hoisting.
Most modern gearboxes are used to increase torque while reducing the speed of a prime mover output shaft. This means that the output shaft of a gearbox rotates at a slower rate than the input shaft, this reduction in speed produces a mechanical advantage, increasing torque. A gearbox can be set up to do the opposite and provide an increase in shaft speed with a reduction of torque; some of the simplest gearboxes change the physical rotational direction of power transmission. Many typical automobile transmissions include the ability to select one of several gear ratios. In this case, most of the gear ratios are used to slow down the output speed of the engine and increase torque. However, the highest gears may be "overdrive" types. Gearboxes have found use in a wide variety of different—often stationary—applications, such as wind turbines. Transmissions are used in agricultural, construction and automotive equipment. In addition to ordinary transmission equipped with gears, such equipment makes extensive use of the hydrostatic drive and electrical adjustable-speed drives.
The simplest transmissions called gearboxes to reflect their simplicity, provide gear reduction, sometimes in conjunction with a right-angle change in direction of the shaft. These are used on PTO-powered agricultural equipment, since the axial PTO shaft is at odds with the usual need for the driven shaft, either vertical, or horizontally extending from one side of the implement to another. More complex equipment, such as silage choppers and snowblowers, have drives with outputs in more than one direction; the gearbox in a wind turbine converts the slow, high-torque rotation of the turbine into much faster rotation of the electrical generator. These are more complicated than the PTO gearboxes in farm equipment, they weigh several tons and contain three stages to achieve an overall gear ratio from 40:1 to over 100:1, depending on the size of the turbine. The first stage of the gearbox is a planetary gear, for compactness, to distribute the enormous torque of the turbine over more teeth of the low-speed shaft.
Durability of these gearboxes has been a serious problem for a long time. Regardless of where they are used, these simple transmissions all share an important feature: the gear ratio cannot be changed during use, it is fixed at the time. For transmission types that overcome this issue, see Continuously variable transmission known as CVT. Many applications require the availability of multiple gear ratios; this is to ease the starting and stopping of a mechanical system, though another important need is that of maintaining good fuel efficiency. The need for a transmission in an automobile is a consequence of the characteristics of the internal combustion engine. Eng
Front-engine, four-wheel-drive layout
In automotive design, an F4, or Front-engine, Four-wheel drive layout places the internal combustion engine at the front of the vehicle and drives all four roadwheels. This layout is chosen for better control on many surfaces, is an important part of rally racing as well as off-road driving. Most four-wheel-drive layouts are front-engined and are derivatives of earlier front-engine, rear-wheel-drive designs; this layout is the drive train of choice for off-road pickup trucks and SUVs. It allows these vehicles to get the most traction without sacrificing precious cargo or passenger room; the center differential is not present in these vehicles, meaning the 4WD system does not allow any difference in front and rear axle speeds. For normal road driving, these vehicles are shifted into 2WD mode, preventing damage to the transfer case.
Four-wheel drive called 4×4 or 4WD, refers to a two-axled vehicle drivetrain capable of providing torque to all of its wheels simultaneously. It may be full-time or on-demand, is linked via a transfer case providing an additional output drive-shaft and, in many instances, additional gear ranges. A four-wheeled vehicle with torque supplied to both axles is described as "all-wheel drive". However, "four-wheel drive" refers to a set of specific components and functions, intended off-road application, which complies with modern use of the terminology. 4WD systems were used in many different vehicle platforms. There is no universally accepted set of terminology to describe the various architectures and functions; the terms used by various manufacturers reflect marketing rather than engineering considerations or significant technical differences between systems. SAE International's standard J1952 recommends only the term All-Wheel-Drive with additional sub classifications which cover all types of AWD/4WD/4x4 systems found on production vehicles.
Four-by-four or 4x4 is used to refer to a class of vehicles in general. Syntactically, the first figure indicates the total number of wheels, the second indicates the number that are powered. So 4x2 means a four-wheel vehicle that transmits engine torque to only two axle-ends: the front two in front-wheel drive or the rear two in rear-wheel drive. A 6×4 vehicle has three axles, two of which provide torque to two axle ends each. If this vehicle were a truck with dual rear wheels on two rear axles, so having ten wheels, its configuration would still be formulated as 6x4. During World War II, the U. S. military would use spaces and a capital'X' – like "4 X 2" or "6 X 4". Four-wheel drive refers to vehicles with two axles providing torque to four axle ends. In the North American market the term refers to a system, optimized for off-road driving conditions; the term "4WD" is designated for vehicles equipped with a transfer case which switches between 2WD and 4WD operating modes, either manually or automatically.
All-wheel drive was synonymous with "four-wheel drive" on four-wheeled vehicles, six-wheel drive on 6×6s, so on, being used in that fashion at least as early as the 1920s. Today in North America the term is applied to both heavy vehicles as well as light passenger vehicles; when referring to heavy vehicles the term is applied to mean "permanent multiple-wheel drive" on 2×2, 4×4, 6×6 or 8×8 drive train systems that include a differential between the front and rear drive shafts. This is coupled with some sort of anti-slip technology hydraulic-based, that allows differentials to spin at different speeds but still be capable of transferring torque from a wheel with poor traction to one with better. Typical AWD systems are not intended for more extreme off-road use; when used to describe AWD systems in light passenger vehicles, it refers to a system that applies torque to all four wheels and/or is targeted at improving on-road traction and performance, rather than for off-road applications. Some all-wheel drive electric vehicles solve this challenge using one motor for each axle, thereby eliminating a mechanical differential between the front and rear axles.
An example of this is the dual motor variant of the Tesla Model S, which on a millisecond scale can control the torque distribution electronically between its two motors. Individual-wheel drive is used to describe electric vehicles with each wheel being driven by its own electric motor; this system has inherent characteristics that would be attributed to four-wheel drive systems like the distribution of the available torque to the wheels. However, because of the inherent characteristics of electric motors, torque can be negative, as seen in the Rimac Concept One and SLS AMG Electric; this can have drastic effects, as in better handling in tight corners. The term IWD can refer to a vehicle with any number of wheels. For example, the Mars rovers are 6-wheel IWD. Per the SAE International standard J1952, AWD is the preferred term for all the systems described above; the standard subdivides AWD systems into three categories. Part-Time AWD systems require driver intervention to couple and decouple the secondary axle from the driven axle and these systems do not have a center differential.
The definition notes. Full-Time AWD systems drive both rear axles at all times via a center differential; the torque split of that differential may be fixed or variable depending on the type of center differential. This system can be used on any surface at any speed; the definition does not address exclusion of a low range gear. On-Demand AWD systems drive the secondary axle via an active or passive coupling device or "by an independently powered drive system"; the standard notes that in some cases the secondary drive system may provide the primary vehicle propulsion. An example is a hybrid AWD vehicle where the primary axle is driven by an internal combustion engine and secondary axle is driven by an electric motor; when the internal combustion engine is shut off the secondary, electrically driven axle is the only driven axle. On-demand systems function with only one powered axle until torque is required by the second axle. At that point either a passive or active coupling sends torque to the secondary axle.
In addition to the above primary classifications the J1952 standard notes seconda