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Các bác có thể thấy rằng các kỹ năng sử dụng chiêu này dùng cho các tay đua xe, chạy xe đua "mạo hiểm" (rally?) hoặc kiểu "đốt bánh" xe
!!! Xin lưu ý các dòng khuyến cáo là các thông tin này chưa được xác thực và có thể bị gỡ bỏ !!!
(nguồn Wikipedia :
Left-foot Braking)
Left-foot braking[/H1] From Wikipedia, the free encyclopedia[/H3]
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(September 2007) Left-foot braking is the technique of using the left foot to operate the
brake pedal in an
automobile, leaving the right foot dedicated to the
throttle pedal.
[1][/SUP] It contrasts with the normal practice of the left foot operating the clutch pedal, and the right foot operating the brake and accelerator pedals.
At its most basic purpose, left-foot braking can be used to decrease the time spent between the right foot moving between the brake and throttle pedals, and can also be used to control
load transfer.
[1][/SUP]
It is most commonly used in
auto racing, but is also used by some drivers for use with an
automatic transmission, as the left foot is not needed to operate a clutch pedal.
[H2]Contents[/H2] [
hide]
[UL]
1 Racing and rallying 2 Road use 3 Maneuvering with automatic transmission 4 References 5 Bibliography 6 External links [/UL]
[H2][
edit] Racing and rallying[/H2]
Karts, many
open wheelers, and some modern road cars (cars that are mounted with
automatic transmission or
semi-automatic transmission which is the
Formula One style gear box), have no foot-operated clutch, and so allow the driver to use their left foot to brake.
One common race situation that requires left-foot braking is when a racer is cornering under power. If the driver doesn't want to lift off the throttle, potentially causing
trailing-throttle oversteer, left-foot braking can induce a mild
oversteer situation, and help the car "tuck," or turn-in better. Mild left-foot braking can also help reduce
understeer.
[2][/SUP]
In
rallying left-foot braking is very beneficial, especially to
front-wheel drive vehicles.
[3][/SUP]
[4][/SUP] It is closely related to the
handbrake turn, but involves locking the rear wheels using the foot brake (retarding actually, to reduce traction, rarely fully locking - best considered a misapplication), which is set up to apply a significant pressure bias to the rear brakes. The vehicle is balanced using engine power by use of the accelerator pedal, operated by the right foot. The left foot is thus brought into play to operate the brake. It is not as necessary to use this technique with
Rear-wheel drive and
All wheel drive rally vehicles because they can be easily turned rapidly by using excess power to the wheels and the use of
opposite lock steering, however the technique is still beneficial when the driver needs to decelerate and slide at the same time. In rear wheel drive, left foot braking can be used when the car is at opposite lock and about to spin. Using throttle and brake will lock the front tires but not the rears, thus giving the rears more traction and bringing the front end around.
Swedish rally legends
Erik Carlsson and
Stig Blomqvist are considered to be the inventors of left-foot braking, developing it while driving for the
SAAB works team in the 1960s and '70s.
When left foot braking is used to apply the brake and the throttle at the same time it is very hard on the car, causing extra wear on the transmission and brakes in particular.
[5][/SUP]
This technique should not be confused with
heel-and-toe, which is another driving technique.
[H2][
edit] Road use[/H2]
This article
contains weasel words, vague phrasing that often accompanies biased or unverifiable information. Such statements should be
clarified or removed.
(March 2009) Many commentators advise against the use of left-foot braking while driving on public roads.
[6][/SUP]
[7][/SUP]
In emergency braking situations, it is common for the driver to extend both legs in a panic reaction. If the right foot is on the throttle, this will cause unwanted and potentially dangerous acceleration.[
citation needed][/SUP]
Most manufacturers of cars with automatic transmissions provide the car with a rest for the driver's left foot so the right foot may be used for both throttle and braking.[
citation needed][/SUP]
Also, when the left foot is often used for depressing the clutch pedal this generally requires less fine motor control than operating the brake. A driver accustomed to simply pressing the pedal to the floor may unexpectedly slow down at an unsafe rate when attempting to use the left-foot braking technique.[
citation needed][/SUP]
In addition, many modern vehicles use a "Drive By Wire" or
Electronic throttle control system instead of the traditional mechanical throttle linkage. These systems have a safety
interlock that prevents left foot braking. The car's
ECU can detect when both pedals are pressed simultaneously and will immediately cut the engine power for safety reasons.[
citation needed][/SUP]
In some vehicles equipped with early versions of the vacuum driven brake booster system, applying throttle with the gearbox in neutral can provide more power assist to the brakes, effectively decreasing the pedal force required for maximum braking.
[H2][
edit] Maneuvering with automatic transmission[/H2] However, some commentators do recommend left-foot braking as routine practice when driving vehicles fitted with an automatic transmission, when maneuvering at low speeds. (See, for example,
The Daily Telegraph columnist "Honest John").
[8][/SUP]
Proponents of the technique note that in low-speed maneuvers, a driver of a vehicle with a manual transmission will usually keep a foot poised over the clutch pedal, ready to disengage power when the vehicle nears an obstacle. This means that disengagement is also possible in the event of malfunction such as an engine surge. However, the absence of a clutch on a vehicle with automatic transmission means that there is no such safety override, unless the driver has a foot poised over the brake pedal.
[8][/SUP]
Critics of the technique suggest that it can cause confusion when switching to or from a vehicle with a manual transmission,
[6][/SUP] and that it is difficult to achieve the necessary sensitivity to brake smoothly when your left foot is used to operating a clutch pedal.
[7][/SUP]
[H2][
edit] References[/H2] ^
[SUP]a[/SUP] [SUP]b[/SUP] "
Team O'Neil Rally School & Car Control Center | Press". Team-oneil.com.
http://www.team-oneil.com/press4.htm. Retrieved 2009-05-04.
^ "
Left Foot Braking In Front Wheel Drive, Rally Racing News". Rallyracingnews.com.
http://www.rallyracingnews.com/lfb.html. Retrieved 2009-05-04.
^ Dave Coleman,
We join the reigning champion team...and drive the junior car, sportcompactcarweb.com,
http://www.sportcompactcarweb.com/motorsports/0109scc_hyundai_tiburon_rally_car/, retrieved 2007-10-10
^ (PDF)
How to left foot brake, February 2005, p. 5,
http://www.suzuki.fr/pages/PDF_Brochure/RallyTalk-2-2005.pdf, retrieved 2007-10-10
^ How the turbo Anti-Lag System works, rallycars.com,
http://www.rallycars.com/Cars/bangbang.html, retrieved 2007-10-10 ^
[SUP]a[/SUP] [SUP]b[/SUP] http://www.driving-school.com.au/faq.htm]Frequently asked question: Why can’t I use the left foot for braking in an automatic car?[/link], driving-school.com.au,
http://www.driving-school.com.au/faq.htm]http://web.archive.org/web/20070429201355/[link]http://www.driving-school.com.au/faq.htm[/link][/link], retrieved 2007-10-10 (from internet archive) ^
[SUP]a[/SUP] [SUP]b[/SUP] "
Ask Ripley". The Daily Telegraph. May 2001.
http://www.telegraph.co.uk/motoring/main.jhtml?xml=/motoring/2001/05/12/emrip12.xml. Retrieved 2007-10-10. "It is true that some drivers with automatic gearboxes use left-foot braking to good effect but, as a general rule, it is difficult to achieve the necessary sensitivity to brake smoothly when your left foot is used to operating a clutch pedal." ^
[SUP]a[/SUP] [SUP]b[/SUP] "
Driving automatics safely: Why do you repeatedly advocate left foot braking of automatic cars?". HonestJohn.co.uk.
http://www.honestjohn.co.uk/faq/faq.htm?id=15. Retrieved 2007-10-11. [/OL]
[H2][
edit] Bibliography[/H2] [UL][*]Ross Bentley (1998),
Speed Secrets: Professional Race Driving Techniques, Osceola, WI, USA: MBI Pub. Co,
ISBN 0-7603-0518-8 [*]Henry A. Watts (1989),
Secrets of Solo Racing: Expert Techniques for Autocrossing and Time Trials, Sunnyvale, Calif.: Loki Pub. Co.,
ISBN 0-9620573-1-2 [/UL]
[H2][
edit] External links[/H2] [UL][*]
Left-foot braking technique explained [/UL] Retrieved from "
[link]http://en.wikipedia.org/wiki/Left-foot_braking[/link]"
Categories:
Driving techniques
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