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1
Throttle - Inspire [Monstercat Free Download]
Throttle - Inspire [Monstercat Free Download]
::2013/03/03::
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2
Throttle - What
Throttle - What's That Sound (Live Mashup)
::2013/09/14::
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Call of Duty Advanced Warfare Walkthrough Gameplay Part 15 - Throttle - Campaign Mission 13 (COD AW)
Call of Duty Advanced Warfare Walkthrough Gameplay Part 15 - Throttle - Campaign Mission 13 (COD AW)
::2014/11/08::
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[Electro] - Throttle - Boombox [Monstercat Release]
[Electro] - Throttle - Boombox [Monstercat Release]
::2013/07/12::
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Cleaning An Electronic Throttle Body Safely
Cleaning An Electronic Throttle Body Safely
::2014/01/10::
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Full Throttle 2015 Corvette Z06 (625 HP)
Full Throttle 2015 Corvette Z06 (625 HP)
::2014/11/21::
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Sam Smith - Stay With Me (Throttle Remix)
Sam Smith - Stay With Me (Throttle Remix)
::2014/07/13::
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8
Advanced Warfare Walkthrough - Mission 13 - THROTTLE (Call of Duty Campaign Let
Advanced Warfare Walkthrough - Mission 13 - THROTTLE (Call of Duty Campaign Let's Play)
::2014/11/04::
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[Electro] - Throttle - Next Big Thing [Monstercat Release]
[Electro] - Throttle - Next Big Thing [Monstercat Release]
::2012/04/27::
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10
Avicii - You Make Me (Throttle Remix)
Avicii - You Make Me (Throttle Remix)
::2013/12/29::
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11
Throttle [Part1]
Throttle [Part1]
::2008/04/24::
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12
Enduro wide open throttle
Enduro wide open throttle
::2013/11/05::
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13
Cleaning Throttle Bodies
Cleaning Throttle Bodies
::2012/07/29::
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14
Throttle Position Sensor - Explained
Throttle Position Sensor - Explained
::2012/11/21::
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15
Full Throttle Longplay - No Commentary
Full Throttle Longplay - No Commentary
::2012/11/25::
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16
Full Throttle Saloon Taking Out the Trash   Season 05 Episode 05
Full Throttle Saloon Taking Out the Trash Season 05 Episode 05
::2014/05/20::
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17
Is Your Car Hesitating.  It  May Need A New Throttle Position Sensor
Is Your Car Hesitating. It May Need A New Throttle Position Sensor
::2013/07/23::
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Full Throttle Saloon Serving Two Masters   Season 05 Episode 01
Full Throttle Saloon Serving Two Masters Season 05 Episode 01
::2014/05/20::
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19
Mesa Boogie Throttle Box EQ
Mesa Boogie Throttle Box EQ
::2014/07/29::
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20
HOW TO CLEAN A THROTTLE BODY !!! D.I.Y. AND SAVE !!
HOW TO CLEAN A THROTTLE BODY !!! D.I.Y. AND SAVE !!
::2012/08/03::
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21
Full Throttle Saloon A Throttle Without Its Captain   Season 05 Episode 02
Full Throttle Saloon A Throttle Without Its Captain Season 05 Episode 02
::2014/05/20::
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22
Launchpad Project File: What
Launchpad Project File: What's that sound - Throttle
::2013/11/24::
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23
Sam Smith - Stay With Me (Throttle Remix)
Sam Smith - Stay With Me (Throttle Remix)
::2014/07/10::
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24
How to clean a throttle body and Idle air control valve (iac)
How to clean a throttle body and Idle air control valve (iac)
::2012/02/01::
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25
DIY: Porting & Polishing a Throttle Body
DIY: Porting & Polishing a Throttle Body
::2013/10/18::
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26
Camry Throttle Body Cleaning
Camry Throttle Body Cleaning
::2012/08/06::
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27
Mesa Boogie Throttle Box - Review
Mesa Boogie Throttle Box - Review
::2013/11/19::
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2014 Bow Review: PSE Archery
2014 Bow Review: PSE Archery's Full Throttle
::2014/06/02::
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29
LucasArts - Full Throttle (Intro)
LucasArts - Full Throttle (Intro)
::2007/06/18::
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30
Throttle Body Cleaning - Dirty Throttle Body Symptoms and Problems
Throttle Body Cleaning - Dirty Throttle Body Symptoms and Problems
::2012/04/11::
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31
Avicii - You Make Me (Throttle Remix) [Extended]
Avicii - You Make Me (Throttle Remix) [Extended]
::2013/12/01::
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32
Throttle - French Kiss
Throttle - French Kiss
::2012/09/21::
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33
How to clean the throttle body on a 2008 Nissan Altima
How to clean the throttle body on a 2008 Nissan Altima
::2014/05/05::
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How to clean throttle body on VW golf MK4
How to clean throttle body on VW golf MK4
::2014/08/09::
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Full Throttle (On-Ride) Six Flags Magic Mountain
Full Throttle (On-Ride) Six Flags Magic Mountain
::2013/06/22::
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KTM 300 EXC Full Throttle
KTM 300 EXC Full Throttle
::2014/04/10::
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37
Full Throttle mud digger 4
Full Throttle mud digger 4
::2013/07/12::
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38
Harley Davidson Throttle Cable Adjustment
Harley Davidson Throttle Cable Adjustment
::2014/01/16::
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Avicii - City Lights (Throttle Remix) [Extended]
Avicii - City Lights (Throttle Remix) [Extended]
::2014/05/30::
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40
VW Throttle Cleaning & Removal Quick & Easy Steps
VW Throttle Cleaning & Removal Quick & Easy Steps
::2013/03/25::
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41
How To Install Replace Throttle Position Sensor Chevy Silverado GMC Sierra
How To Install Replace Throttle Position Sensor Chevy Silverado GMC Sierra
::2013/09/13::
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42
Throttle Body Removal and Cleaning 2000 Chevy Tahoe
Throttle Body Removal and Cleaning 2000 Chevy Tahoe
::2013/12/28::
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43
Aly & Fila & Sneijder - Full Throttle (Original Mix) [The Other Shore]
Aly & Fila & Sneijder - Full Throttle (Original Mix) [The Other Shore]
::2014/08/01::
Play Video
44
Part 1 Cleaning LS Throttle Body | Vortec 4.8 5.3 6.0 6.2 Liter
Part 1 Cleaning LS Throttle Body | Vortec 4.8 5.3 6.0 6.2 Liter
::2012/08/23::
Play Video
45
Call of Duty ADVANCED WARFARE Walkthrough (Part 13) - Campaign Mission 13 "THROTTLE" (COD 2014)
Call of Duty ADVANCED WARFARE Walkthrough (Part 13) - Campaign Mission 13 "THROTTLE" (COD 2014)
::2014/11/14::
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46
Cleaning a Jeep Cherokee Throttle Body
Cleaning a Jeep Cherokee Throttle Body
::2013/01/21::
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47
Ford Focus & Escape Sticking Throttle Body 4cyl Engines
Ford Focus & Escape Sticking Throttle Body 4cyl Engines
::2013/12/26::
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48
HD Full throttle - Death @ TT Isle of Man (IOMTT) Road Racing
HD Full throttle - Death @ TT Isle of Man (IOMTT) Road Racing
::2013/06/06::
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49
Quick Tip-Throttle Cleaning - EricTheCarGuy
Quick Tip-Throttle Cleaning - EricTheCarGuy
::2009/07/27::
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50
2010 Ford Escape Electronic Throttle Body Replacement
2010 Ford Escape Electronic Throttle Body Replacement
::2014/01/10::
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From Wikipedia, the free encyclopedia
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This article is about the control of engine power. For other uses, see Throttle (disambiguation).

A throttle is the mechanism by which the flow of a fluid is managed by constriction or obstruction.

An engine's power can be increased or decreased by the restriction of inlet gases (i.e., by the use of a throttle), but usually decreased. The term throttle has come to refer, informally and incorrectly, to any mechanism by which the power or speed of an engine is regulated. What is often termed a throttle (in an aviation context) is more correctly called a thrust lever. For a steam engine, the steam valve that sets the engine speed/power is often known as a regulator.

Internal combustion engines[edit]

A cross-section view of a throttle valve

In a gasoline internal combustion engine, the throttle is a valve that directly regulates the amount of air entering the engine, indirectly controlling the charge (fuel + air) burned on each cycle due to the fuel-injector or carburetor maintaining a relatively constant fuel/air ratio. In a motor vehicle the control used by the driver to regulate power is sometimes called the throttle pedal or accelerator.

The throttle is typically a butterfly valve. In a fuel-injected engine, the throttle valve is placed on the entrance of the intake manifold, or housed in the throttle body. In a carbureted engine, it is found in the carburetor.

When a throttle is wide open, the intake manifold is usually at ambient atmospheric pressure. When the throttle is partially closed, a manifold vacuum develops as the intake drops below ambient pressure.

Usually, the throttle valve is controlled with a throttle pedal or lever via a direct mechanical linkage. In vehicles with electronic throttle control, the manual throttle control sends a signal to the Engine Control Unit (ECU), which then directly controls the position of the throttle valve. This means that the operator does not have direct control over the throttle valve; the ECU can finely control the valve in order to reduce emissions or maximize performance.

In a reciprocating-engine aircraft, the throttle control is usually a hand-operated lever or knob. It controls the engine power, which may or may not reflect in a change of RPM, depending on the propeller installation (fixed-pitch or constant speed).[1]

The power output of a diesel engine is controlled by regulating the quantity of fuel that is injected into the cylinder. Because the engines do not need to control air volumes, they lack a butterfly valve in the intake tract. An exception to this generalization is newer diesel engines meeting stricter emissions standards, where a throttle is used to generate intake manifold vacuum, thereby allowing the introduction of exhaust gas (see EGR) to lower combustion temperatures and thereby minimize NOx production.

Throttle body[edit]

The components of a typical throttle body

In fuel injected engines, the throttle body is the part of the air intake system that controls the amount of air flowing into the engine, in response to driver accelerator pedal input in the main. The throttle body is usually located between the air filter box and the intake manifold, and it is usually attached to, or near, the mass airflow sensor.

The largest piece inside the throttle body is the throttle plate, which is a butterfly valve that regulates the airflow.

On many cars, the accelerator pedal motion is communicated via the throttle cable, to activate the throttle linkages, which move the throttle plate. In cars with electronic throttle control (also known as "drive-by-wire"), an electric motor controls the throttle linkages and the accelerator pedal connects not to the throttle body, but to a sensor, which sends the pedal position to the Engine Control Unit (ECU). The ECU determines the throttle opening based on accelerator pedal position and inputs from other engine sensors.

Throttle body showing throttle position sensor. The throttle cable attaches to the curved, black portion on the left. The copper-coloured coil visible next to this returns the throttle to its idle position when the pedal is released.

When the driver presses on the accelerator pedal, the throttle plate rotates within the throttle body, opening the throttle passage to allow more air into the intake manifold. Usually an airflow sensor measures this change and communicates with the ECU. The ECU then increases the amount of fuel being sent to the fuel injectors in order to obtain the desired air-fuel ratio. Often a throttle position sensor (TPS) is connected to the shaft of the throttle plate to provide the ECU with information on whether the throttle is in the idle position, wide-open throttle (WOT) position, or somewhere in between these extremes.

Throttle bodies may also contain valves and adjustments to control the minimum airflow during idle. Even in those units that are not "drive-by-wire", there will often be a small electric motor driven valve, the Idle Air Control Valve (IACV), that the ECU uses to control the amount of air that can bypass the main throttle opening.

Image of BMW S65 from the e92 BMW M3 showing eight individual throttle bodies

Many cars have a single throttle body. Others employ more than one, chained together by linkages to improve throttle response. At the extreme, high performance cars like the E92 BMW M3 and high performance motorcycles like the Yamaha R6 use a separate throttle body for each cylinder, often called "individual throttle bodies" or ITBs.

A throttle body is somewhat analogous to the carburetor in a non-injected engine. Carburetors combine the functionality of the throttle body and fuel injectors into one in order to modulate the amount of air flow and to combine air and fuel together. Cars with throttle body injection (called TBI by General Motors and CFI by Ford) locate the fuel injectors in the throttle body, thereby allowing an older engine to be converted from carburetor to fuel injection without significantly altering the engine design.

Other engines[edit]

Steam locomotives normally have the throttle (North American English) or regulator (British English) in a characteristic dome at the top of the boiler. The additional height afforded by the dome helps to avoid any liquid (e.g. from bubbles on the surface of the boiler water) being drawn into the throttle valve, which could damage it, or lead to priming. The throttle is used in conjunction with the reversing lever to start, stop and to control the locomotive's power although, during steady-state running of most locomotives, it is preferable to leave the throttle wide open and to control the power by varying the steam cut-off point (which is done with the reversing lever), as this is more efficient. A steam locomotive throttle valve poses a difficult design challenge as it must be opened and closed using hand effort against the considerable pressure (typically 250psi) of boiler steam. Examples include the balanced "double beat" type used on Gresley A3 Pacifics.

Throttling of a rocket engine means varying the thrust level in-flight. This is not always a requirement; in fact, the thrust of a solid-fuel rocket is not controllable after ignition. However, Liquid-propellant rockets can be throttled by means of valves which regulate the flow of fuel and oxidizer to the combustion chamber. Hybrid rocket engines, such as the one used in Space Ship One, use solid fuel with a liquid oxidizer, and therefore can be throttled. Throttling tends to be required more for powered landings, and launch into space using a single main stage (such as the Space Shuttle), than for launch with multistage rockets.

In a jet engine, thrust is controlled by changing the amount of fuel flowing into the combustion chamber. In some instances, a "throttle" is known as a "thrust lever" (as in most Airbus and Boeing aircraft). This is chiefly due to the fact that "throttle" is associated with traditional gasoline engines.[2]

See also[edit]

References[edit]

  1. ^ "Chapter 6: Aircraft Systems" (PDF). Pilot's Handbook of Aeronautical Knowledge. Federal Aviation Administration. 2008. Retrieved 2009-02-09. 
  2. ^ "CEO of the Cockpit #84: Terms of Up-Gearment". Avweb.com. 2008-06-30. Retrieved 2009-09-10. 

External links[edit]

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