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Topic: Engine braking

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	Engine braking - Definition, explanation
		Engine braking is the act of using the energy-requiring compression stroke of the internal combustion engine to dissipate energy and slow down a vehicle.
		Diesel engines are adiabatic and have no spark plugs and use energy transferred to the fuel-air mixture during compression to directly ignite the mixture.
		Engine braking is otherwise always active in all non-hybrid cars with an internal combustion engine, regardless of transmission type.
	www.calsky.com /lexikon/en/txt/e/en/engine_braking.php (568 words)

	Engine braking - Wikipedia, the free encyclopedia
		Engine braking is the act of using the energy-requiring compression stroke of the internal combustion engine to dissipate energy and slow down a vehicle.
		Compression in an engine is driven by the flywheel.
		The jake brake is required in large diesel vehicles because the rate of conversion of mechanical energy into waste thermal energy is low compared to the mechanical returns to kinetic energy from the air-spring effect in the engine.
	en.wikipedia.org /wiki/Engine_braking (728 words)

	Engine braking in diesels (David Stockton) (Site not responding. Last check: 2007-10-21)
		The engine braking is : tremendous, but of course, it is being assisted by the Jacobs engine brake : ("Jake Brake", which instantly shuts off the fuel feed to the injectors : when you reduce your foot pressure on the throttle.
		the braking energy is turned into engine heat, the engine has a nice cooling system and radiator to get rid of the heat, and it's at a time when the engine isn't creating heat by burning fuel.
		Consider an engine without an obstruction, air is compressed, which takes energy from the motion of the vehicle.
	www.yarchive.net /car/diesel_engbrake.html (368 words)

	Procedure for upshifting gear in a motor vehicle and a power plant unit for a motor vehicle - Patent 7077024
		The arrangement includes an internal combustion engine (1) with an engine-braking device (52), an automated disk-clutch (3), a multi-stage gearbox (9), in the casing (8) of which an input shaft (7), an intermediate shaft (11) and a main shaft (10) are mounted, and an intermediate shaft brake (50) for braking the intermediate shaft (11).
		In addition to using the engine-braking device for braking the vehicle itself, that is to say as a supplement to the wheel brakes of the vehicle, it is known to use the engine-braking device, for example a compression brake, during shifting in vehicles with a multi-stage (usually automated) gearbox.
		The reason the engine speed does not have to be reduced as far as 1200 rpm is that the disk clutch between the engine and the gearbox is not as sensitive to speed differences as in particular a gear with an unsynchronized claw coupling (unsynchronized gear).
	www.freepatentsonline.com /7077024.html (3928 words)

	Quasiturbine> Theory> Engine Problematic
		Engines fail to be "all in one" compact, low weight, low noise, zero vibration, high torque at low rpm, efficient on a wide power range...
		Due to this effect, the engine in Beau de Rocha (Otto) cycle opposes to all RPM revolution increase (well known as the engine compression braking) and this intrinsic resistance to speed augmentation is compensated by a constant and important fuel consumption at all time, except at full power.
		Generally, the engine combustion chamber is a non-desirable parasite volume from the stand point of energy efficiency, since it must be pressurized in pure lost before being able to produce strong forces on the piston and so to make useful mechanical work.
	quasiturbine.promci.qc.ca /ETheoryEngineProblematic.htm (2946 words)

	Quasiturbine> Theory> Detonation Engine
		This is a near stochiometric engine which cannot be made a detonation engine because of low intake vacuum pressure (at low load factor), which once compressed cannot generally provides the amount of heat required for detonation.
		Despite all effort done to avoid detonation in piston engine, this is a superior combustion mode which is not discarded for the future engines.
		In experiments on photo-detonation with piston engines, the researchers attenuate the violence of the detonation by reducing the oxygen concentration in admission by mixing the air with exhaust.
	quasiturbine.promci.qc.ca /ETheoryDetonationEngine.htm (2820 words)

	Auxiliary engine braking system (Site not responding. Last check: 2007-10-21)
		The braking systems of the compression relief type can be combined with other engine braking systems, for example, systems in which combustion in the cylinders is interrupted and/or systems in which back pressure is created in the exhaust manifold.
		Moreover, were the driver to wish to disarm momentarily or for short periods the auxiliary braking system while underway, as when road conditions are such that skidding may result during a down hill run, again he or she would need to reach over the steering wheel or between its spokes to effect the change.
		Were the vehicle in which the exemplary auxiliary braking system of the present invention placed powered by a six cylinder engine, each of the solenoid valves 38-40 would effect the converting of a respective pair of the cylinders from a combustion mode into a compression relief mode.
	www.emergenthomestore.com /techcat/thermoplastic_resinoid_hot_melt_compositions/auxiliary_engine_braking_system.html (5446 words)

	Halfbakery: CVT engine brake pedal
		The CVT engine brake pedal is a third pedal (where the clutch would be in a car with a manual transmission) that, depending on how far it is pressed, adjusts the gear ratio to hold the engine at a certain rpm.
		One advantage is that it doesn't wear out your brakes so you don't have to replace them as often, and another advantage is that it is more fuel efficient, especially if the fuel to the engine is turned of while engine braking.
		Engine braking could reduce wear on the brakes, true, though I would expect the cost to implement it as described would exceed the reduction in brake-maintenance costs.
	www.halfbakery.com /lr/idea/CVT_20engine_20brake_20pedal (1485 words)

	Road Smart Engine Savvy 12 Tips for Safe & Effective Use (Site not responding. Last check: 2007-10-21)
		An engine brake controls the engine’s exhaust valves in some or all of the cylinders, depending on the amount of retardation you select.
		Designed to compete with engine brakes and fixed orifice exhaust brakes, the quiet-operating PRXB is said to develop a third more retarding horsepower than a standard exhaust brake at 1500 RPM.
		If the Jake Brake is on, do not shift without using the clutch or double-clutch (to use the engine brake to reduce RPM – also known as Jake Shifting).
	www.bigrigowner.com /articles/0305rs.html (935 words)

	The Top Cars - Engine Braking:
		Engine braking is not as valuable in RWD cars because the wieght still transferd foward so the braking capacity of the rear tires is some what inefficient.
		Now the most important reasons why engine braking works so well in FWD cars is because the rear tires are free they are uneffected by the engine's power.
		when engine braking the wieght transfer is fast and a bit violent, the rear tires in theory are using 0 percent braking and will continue to hold momentum.
	www.the-top.com /forum/showthread.php?t=76 (405 words)

	All Things Motorcycle - Engine braking. (Site not responding. Last check: 2007-10-21)
		I've had a few discussions about engine braking, and the general consensus is that using your engine to slow your forward momentum is a bad idea, no matter what you're doing.
		Admittedly braking is not a good idea while in a turn, but if for some reason it became neccessary (rather than habit), downshifting might give time for proper reaction (straightening the bike and applying brakes as would be normally expected).
		Engine braking is used in racing, but engine life past the end of the race is not as important to racer as winning the race.
	www.msgroup.org /forums/mtt/topic.asp?TOPIC_ID=2283 (2771 words)

	Jake brake - Wikipedia, the free encyclopedia
		An engine brake is a braking system used primarily on semi-trucks or other large vehicles that modifies engine valve operation to use engine compression to slow the vehicle.
		In a gasoline engine, some engine braking is provided during closed-throttle operation due to the work required to maintain intake manifold vacuum.
		A compression release engine brake uses an extra lobe on the camshaft to open a second exhaust valve at the top of the compression stroke.
	en.wikipedia.org /wiki/Jake_brake (454 words)

	Engine flywheel brake toggle mechanism - Patent 4519486
		The safety device of claim 13 wherein the biasing of the deadman control and of the braking member is accomplished by a spring joining a pair of adjacent toggle arms, the braking member comprising a friction surface supporting lever pivotably attached near one end thereof to the engine.
		Another known application of a deadman lever to a power driven implement is the interposition of a clutch brake arrangement between the power source such as an internal combustion engine and the dangerous implement such as the rotating blade of a rotary lawnmower or snowthrower.
		Thus, the lower surface of the brake arm near the brake pad end engages this abutment 83 so that lever arm movement is effective to force the brake pad into engagement with the annular surface.
	freepatentsonline.com /4519486.html (2424 words)

	e T r u c k e r ---TRUCKERS NEWS -- the number one lifestyles magazine for over the road truckers.
		Or you can turn the engine over until the exhaust rocker’s roller, the one on the left on each cylinder, is on the base circle of the camshaft and completely off the cam lobe before adjusting the Jake parts for the valves of each cylinder.
		After installation, the engine’s ECM needs to be reprogrammed (or “reburned”) so it will properly coordinate the operation of the brake with the engine rpm, pedal positions and ABS.
		Tractor and trailer brake jobs are expensive and mean downtime; using an engine brake properly could reduce their frequency by at least 40 percent.
	www.etrucker.com /apps/news/article.asp?id=47017 (2289 words)

	Engine brakes
		And such widespread changes to engines means that changes to engine brakes and exhaust brakes can't be far behind.
		One emissions-related technology that affects exhaust brakes is exhaust-gas recirculation (EGR), which a number of engine makers are planning to use to meet the '02 standards.
		Pacbrake explains that if EGR is operational during idle on an engine using an exhaust brake that is turned on, the massive flow of exhaust to the intake will cause the engine to stall.
	fleetowner.com /mag/fleet_engine_brakes/index.html (701 words)

	Jacobs Vehicle Systems - Vehicle Noise and Compression Release Engine Braking
		The engine brake is activated only when the driver's foot is off of the accelerator pedal and no fuel is being injected into the cylinder.
		The overall result of engine brake usage is of significant value to the trucking industry and to the general public as well.
		Studies have also shown that the operation of an engine brake produces sound levels that are similar to those produced during acceleration on properly muffled vehicles [2].
	www.jakebrake.com /about-us/vehicle-noise-and-compression-release-engine-braking.php (2097 words)

	ATV Connection Forums - 05 650 V2 Engine braking and emergency brake
		On extremely steep hills I have to use the hand brakes in conjunction with the engine braking.
		Engine braking is always more effective in low and I try not to use the hand brake while going down hills as if you lock up the fronts they don't steer very well.
		Wed May 18, 2005 1:18 PM Downhill braking on mine is decent in H and really good in L. I do have to use the handbrake at times to slow downhill when necessary if it's steep but I think the engine braking is doing it's part.
	forums.atvconnection.com /messageview.cfm/catid/5/threadid/452669.cfm (682 words)

	HowardForums: Your Mobile Phone Community & Resource - Q about engine-braking again!
		Is it good for the engine - Depending on the application (car, light truck, HD tractor) engine braking does a couple things.
		In a tractor trailer, the engine is designed for braking, so much so that when you need it, you can use a "jake brake" to really aid in engine compression to slow the vehicle down.
		In a car however, the engine braking effect is significantly reduced because it does not have a "jake brake".
	www.howardforums.com /showthread.php?t=132230 (1877 words)

	Highway noise and vibration control consulting - Special Traffic Noise Studies
		Engine Braking Noise Study, Paris and Delaplane, VA HMMH investigated truck engine braking noise in Paris and Delaplane, Virginia.
		The measurements included simultaneous logging of the engine braking events and their maximum sound levels.
		VDOT implemented different noise abatement measures to limit the truck braking activity, including lowering posted speed limits, placing several signs requesting limited use of engine braking, and installing rumble strips near a railroad crossing.
	www.hmmh.com /highway_studies04vdot.html (136 words)

	Utility Products Showcase -March 2004 (Site not responding. Last check: 2007-10-21)
		Unlike engine brakes which are banned from inner city use due to excessive noise, exhaust brakes can be used anywhere with little or no noticeable noise during braking.
		Pacbrake is continually improving their exhaust brakes to meet the new demands of the trucking industry.
		The enhanced exhaust brake performance of the PRXB at mid-range will decrease the number of brake relines as many as five times over the life of the vehicle.
	www.utilityproducts.com /Articles/2005/06/pacbrake.htm (713 words)

	Ram exhaust brake
		An exhaust brake uses a butterfly valve behind the turbocharger or in the exhaust pipe to restrict the flow of exhaust gas.
		This forces the engine to act like a large air compressor and results in engine braking better than many gasoline engines can produce (remember, the gasoline engine only has 14.7 psi from the atmosphere, while the diesel exhaust brakes easily double that).
		He said that because the exhaust brake butterfly is so close to the outlet of the turbo, the exhaust flow is too turbulent (not to mention warm) to get an accurate pressure drop measurement.
	dodgeram.org /ki4cy/exhbrake/exh_brake.htm (3290 words)

	ScionLife View topic - Engine Braking 101
		Brake pads are meant to be replaced as are rotors..
		Brakes are meant to stop the car, so use them, but that doesn't mean engine braking can't be used as an assist.
		I also use engine braking (backing off the throttle a bit) to maintain my distance with all the auto drivers in front who feel the need to tail the person in front of them and brake every 3-4 seconds.
	www.scionlife.com /forums/viewtopic.php?t=163787 (3419 words)

	Diesel Engine Brake \| Banks Power: How an Exhaust Brake Works by C.J. Baker
		This can be disconcerting to a driver that is used to the engine braking produced by a gasoline engine, and it can be downright unnerving to the driver of a heavily-loaded diesel pickup or motorhome on a downhill grade, especially if the vehicle’s service brakes begin to overheat and fade.
		An exhaust brake is a device that essentially creates a major restriction in the exhaust system, and creates substantial exhaust backpressure to retard engine speed and offer some supplemental braking.
		If the pressure in the exhaust system, which also bears against the back side of closed exhaust valves in a multi-cylinder engine, exceeds the valve springs’ ability to hold the valves on their seats, the exhaust valves would be forced open and the pistons could strike the valves, causing severe engine damage.
	www.bankspower.com /tech_howexhaustbrakeworks.cfm (1511 words)

	Halfbakery: Car Thrust Reversers
		When you apply the brakes hard enough for ABS to engage, your engine revs up to crank a series of small but sturdy propellers behind the grill of your car that apply rearward thrust to aid in stopping the car.
		The maximum braking force applied through the wheels is always equal to the weight of the vehicle times the coefficient of friction.
		I'll concede that engine braking only works when the wheels are in contact with the road (just like brakes; but if I find myself in a situation where I want to brake and my wheels aren't in contact with the road, I have bigger problems.
	www.halfbakery.com /idea/Car_20Thrust_20Reversers (1521 words)

	No engine braking - SaturnFans Forums (Site not responding. Last check: 2007-10-21)
		If it's in "drive" but happens to be in second gear you won't get the engine braking you would if you put the gear selector in "2".
		Assuming friction in your engine is relativly constant, the energy spent in braking (or lost while accelerating for that matter) is proportional to the engine speed.
		I agree that the engine braking is mininal because the tranny was always want to stay in the HIGHEST gear, which has the LEAST engine braking effect.
	www.saturnfans.com /forums/showthread.php?t=18837 (1681 words)

	engine braking - Car Forums and Automotive Chat
		I would like to know about engine braking on a transport 3.8.
		I thought it was a transmission failure when I bought the car in 1999 After a big breakdown I changed the transmission last week, but it is always the same I don't fell the engine braking like on a manual gearbox, may be it is normal on an automatic transaxle.
		When selecting 2 or 1, the 1-2 band applies and does procure engine braking as you mentioned.
	www.automotiveforums.com /t375329-engine_braking.html (253 words)

	Is engine braking better than using the pedal brakes? - DoItYourself.com Community Forums
		I say that using the pedal brakes to slow down is better than than down shifting with the manual transmission because I would rather replace the brake pads than wear out the engine prematurely.
		I was always told engine braking is better then using the "regular" breaks.
		Funny, nobody commented that when engine braking, assuming you are also gearing down, you are also prematurely wearing out the clutch, and in some cars, especially the front wheel drivers, that can be a costly item.
	forum.doityourself.com /showthread.php?t=228272 (655 words)

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