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Topic: Displacement on Demand

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	Automotive Engineering International Online: Tech Briefs
		DOD enables the working cylinders to achieve higher fuel efficiency through better thermal, pumping, and mechanical efficiency.
		Aided by DOD algorithms, it then controls spark advance, fuel injectors, electronic throttle, and four valvetrain control solenoids in precise coordination to achieve seamless transition between V4 and V8 operation.
		DOD is just one of several advanced powertrain technologies GM is developing to address fuel economy.
	www.sae.org /automag/techbriefs/07-2001/index.htm (1037 words)

	GM - GMability Environment: News: Displacement on Demand in Action (Site not responding. Last check: 2007-11-05)
		Displacement on Demand automatically turns off half of the cylinders during light-load operating conditions, enabling the working cylinders to achieve higher fuel efficiency through better thermal, pumping and mechanical efficiency.
		With Displacement on Demand, the vehicle's powertrain control module determines load conditions based on inputs from vehicle sensors.
		Displacement on Demand also leverages an existing oil pump system to provide hydraulic pressure to activate the system.
	www.gm.com /company/gmability/environment/news_issues/news/displacement_explainer_052101.html (597 words)

	GM's 'Displacement On Demand' Technology To Provide Fuel Economy Benefits
		Displacement on Demand will be featured in standard and optional Vortec engines in GM's large trucks and full-size sport-utility vehicles.
		Displacement on Demand is an example of how GM has continuously improved the engine by adding new technology.
		Displacement on Demand is just one of several advanced powertrain technologies GM is developing to address fuel economy.
	www.theautochannel.com /news/2001/05/31/022158.html (1667 words)

	Reviews OnLine Auto: Displacement on Demand
		GM intends to roll out Displacement on Demand to a majority of their V-6 based vehicles during the next few model years.
		In 2000, when I first looked at this Displacement on Demand technology, I recalled the similar, but problematic 4-6-8 technology used in some Cadillacs during the early eighties.
		Displacement on Demand probably won't even be noticed by most consumers, other than through their pocketbooks, due to the improved fuel economy they will achieve.
	www.reviewsonline.com /auto/gmdod.htm (479 words)

	CanadianDriver: Auto Tech - GM's Displacement on Demand
		The technology is called Displacement on Demand, and it is set to provide a combination of power and fuel economy in GM's SUVs and trucks beginning in 2004.
		Increasing fuel economy by up to 25% in real world testing, the displacement on demand system saves fuel by using only half of the engine's cylinders during most normal driving conditions, and uses all the cylinders when accelerating or carrying loads.
		While Displacement on Demand mechanical technology could be implemented on overhead camshaft and four-valve per cylinder engines, the most economical implementation is on pushrod operated two-valve per cylinder engines - just like the majority of GM's Vortec family of truck engines.
	www.canadiandriver.com /articles/jk/020710.htm (717 words)

	General Motors and Delphi Make Vehicles More Fuel Efficient with Displacement on Demand
		Displacement on Demand is an advanced valve train technology that seamlessly "turns off" half of the engine's cylinders under certain driving conditions.
		A combination of Displacement on Demand with other fuel saving technologies such as Electric Power Steering or cam phasing would provide additional benefits to vehicle manufactures and consumers alike.
		"Displacement on Demand is being added to high-volume vehicles with notable opportunities for improved fuel economy," said Guy Hachey, vice president Delphi Corp. and president of Delphi Energy & Chassis.
	www.delphi.com /news/pressReleases/pr38727-04042005 (506 words)

	GM, Eaton team up for "Displacement on Demand" \| Leftlane News - Car News For Enthusiasts (Site not responding. Last check: 2007-11-05)
		General Motors codeveloped its "Displacement on Demand" technology with Eaton, an electrical systems and components manufacturer.
		Displacement on Demand is cylinder-decativation technology that enables the engine to seamlessly operate on only half of the engine's cylinders when full power is not needed, improving efficiency by as much as 12 percent in some vehicles.
		The "intelligent" valve lifter is the technology that uncouples the unneeded intake and exhaust valves, while the lifter oil manifold assembly - neatly tucked in an open space in the engine cavity - is responsible for directing engine oil pressure to and from the lifter during cylinder deactivation and reactivation.
	www.leftlanenews.com /2005/10/14/gm-eaton-team-up-for-displacement-on-demand (492 words)

	GM's Advanced Engines (Site not responding. Last check: 2007-11-05)
		That would be GM's Displacement on Demand (DoD) cylinder-deactivation system, which debuts on a new car and three big SUVs next year.
		GM's DoD system allows an engine to use maximum power whenever it's needed without any discernable hesitation or pause (test-drives showed that to be true) and then puts half of its cylinders on standby when they're not required.
		DoD will be standard on both the 3.9 V6 and the 5.3 V8, and GM expects it to be a big part of its future powertrain lineup.
	www.edmunds.com /advice/specialreports/articles/100831/article.html (977 words)

	Kane County Chronicle - Online (Site not responding. Last check: 2007-11-05)
		Impala is the only Chevrolet car to have displacement on demand, a feature that also is available in the Pontiac Grand Prix and in GM truck engines.
		DOD is proven to increase fuel economy substantially.
		This economy is obtained with the help of DOD, which shuts off four cylinders when the Impala is traveling at a steady highway cruising speed.
	www.kcchronicle.com /Wheels/reviews/313771275398075.php (656 words)

	Printer Version (Site not responding. Last check: 2007-11-05)
		Displacement on Demand will be a standard feature in the vehicles' optional Vortec 5300 V-8 engine.
		"Displacement on Demand will enhance fuel economy without compromising performance or the ability to carry heavy loads," said Sam Winegarden, GM Powertrain chief engineer of Vortec V-8 engines.
		But once the vehicle has accelerated to speed, the engine-control module activates Displacement on Demand, providing improved fuel economy through a relatively inexpensive change in displacement to meet the vehicle-load requirements.
	www.trailerlife.com /printer.cfm?id=490807 (310 words)

	GM Announces 3900 OHV Engine - XtremeGM.com: GM Performance Community (Site not responding. Last check: 2007-11-05)
		DOD significantly reduces overall fuel consumption by allowing the engine to operate on just half of its cylinders when driving conditions don’t require full power.
		Michalski said the 3900’s increased displacement fits like glove-in-hand with Displacement on Demand: “A bigger engine is better when you want to maximize the amount of time the engine spends in three-cylinder operation,” he explained.
		Michalski said that to attain the 3.9 liters of displacement Powertrain engineers deemed ideal, the 3900’s larger cylinder bores had to be offset 1.5 mm from the crankshaft center line so that the cylinders did not interfere with the camshaft.
	www.xtremega.com /forums/showthread.php?t=485 (2015 words)

	GM Displacement Engine Technology - Popular Hot Rodding Magazine (Site not responding. Last check: 2007-11-05)
		That technology enables cylinder deactivation (called displacement-on-demand or "DOD" by GM insiders) during periods of low load demand and is the source of the increased efficiency mentioned earlier.
		Had GM elected to apply DOD technology to performance vehicles such as the Corvette, GTO or a future Camaro, there would be far less pressure from corporate average fuel economy (CAFE) to import sub-compacts from outside GM as is the case now.
		Since DOD relies on the use of electronic throttle control, the throttle body is not interchangeable with earlier cable-actuated throttle bodies.
	www.popularhotrodding.com /features/0405phr_gmdod (3351 words)

	Power launch: three new GM powertrains offer more power and showcase Displacement on Demand and variable valve timing ... (Site not responding. Last check: 2007-11-05)
		According to Stephens, displacement on demand, a furl-saving technology that allows six and eight-cylinder engines to run on half of their cylinders in certain conditions, will be installed on two million engines annually by 2008.
		A version of the 5300, sans DOD is available now in the Buick Ranier and a non-DOD automotive application of the 5300 will debut later this year in the '05 Corvette.
		DOD is activated by delivering high pressure off to the lifters, which depress the pin and allow the outer portion of the shaft to move with the cam lobe while the inner portion doesn't move, holding the pushrod in place.
	www.findarticles.com /p/articles/mi_m3012/is_12_183/ai_111617012 (910 words)

	GM Moves Ahead On Commitment To Build World's Best Powertrains
		When Displacement on Demand production begins in the V-8 and V-6 engines, the system will be featured in more than 2 million vehicles by 2008.
		Displacement on Demand will help to increase fuel efficiency anywhere from U.S. federal testing estimated at 8 percent and up to a potential 20 percent for some customers in certain real world driving conditions.
		The Displacement on Demand V-6 will always start on six cylinders, and transition seamlessly from six-cylinder to three-cylinder operation under light load operating conditions in third and fourth gears.
	www.new-cars.com /news/021004-gm-powertrain.html (1062 words)

	GM’s ‘Displacement on Demand’ Improves Fuel Economy Innovative V-8, V-6 Technology for Cars, Trucks, ...
		Displacement on Demand will debut in 2004 as part of the Vortec V-8 engine family.
		Displacement on Demand will be featured in standard and optional Vortec engines in GM's large trucks and sport-utility vehicles.
		When Displacement on Demand production begins in both the V-8 and V-6 engines, the system will be featured in more than 2 million vehicles by 2008.
	email.gmcanada.com /corpdb/cachq/pressrel.nsf/0/0ae45b042994318285256d3a004e5a8a?OpenDocument (421 words)

	CanadianDriver: Auto Tech - GM's Displacement on Demand
		Nearly three years after GM started talking about Displacement on Demand, the first vehicles are hitting the streets with this fuel saving technology.
		DOD uses the power of today's 32-bit engine computer to control valve deactivation, throttle control, injection control and spark advance in an integrated sequence so that the switch between four and eight cylinders is smooth.
		There are no indicators on the GMC Envoy to indicate it has the DOD system nor any visual indication to the driver that the engine is running or 4 or 8 cylinders.
	www.canadiandriver.com /articles/jk/041020.htm (861 words)

	Green Car Congress: GM Expands Deployment of Displacement on Demand
		Since first introducing cylinder deactivation (Displacement on Demand—DOD—in the GM lexicon) in the MY 2005 Envoy and Trailblazer extended SUVs, GM has been steadily increasing the number of applications of its 5.3-liter V8 DOD engines, most recently announcing a 5.3-liter DOD engine for the 2006 Saab SUV.
		Although the company had earlier indicated it would introduce V6 engines with Displacement on Demand for passenger cars this year, it has pushed that rollout back to the 2007 model year to do additional fine-tuning on noise and vibration.
		In the DOD V8 engines, the special de-ac lifters are installed in cylinders 1, 4, 6 and 7, while the remaining cylinders use conventional lifters.
	www.greencarcongress.com /2005/11/gm_expands_depl.html (3212 words)

	PickupTruck.Com - Three Technologies That Will Change Your Pickup Truck
		Displacement on Demand switches off those engine cylinders that aren't needed when a truck is in motion, such as when cruising at highway speeds.
		Displacement on Demand uses the oil pump system for hydraulic pressure to activate the system.
		We drove a Sierra equipped with the new DOD technology and were challenged to determine when the vehicle was using four or eight cylinders, and to identify exactly when the engine made the change.
	www.pickuptruck.com /html/stories/gmctech/three3.html (483 words)

	Planet Ark : GM to add fuel-saving device to SUVs, pickups
		Displacement on demand, or DOD, automatically shuts off half of a V8's eight cylinders, temporarily turning it into a more efficient four-cylinder engine, when the vehicles are cruising at a constant speed or carrying a light load.
		DOD will be rolled out over several years and be added to most SUVs and pickup trucks by 2008, as well as to many passenger cars with V6 engines.
		GM's Roman said the DOD technology will be added to some mid-size cars in 2005, and by 2008, it will be fitted on more than 2 million vehicles on the road.
	www.planetark.org /dailynewsstory.cfm/newsid/20776/story.htm (629 words)

	Eaton Innovations Contribute to GM Displacement On Demand
		Eaton Innovations Contribute to GM Displacement On Demand
		Eaton will provide GM with variable valve actuation technology and components for GM's new advanced powertrain technology called Displacement on Demand.
		Displacement on Demand provides a precise and instantaneous electronic matching of engine displacement to the performance level being demanded by the driver.
	www.theautochannel.com /news/2001/05/21/021305.html (441 words)

	Engineering Trends
		Displacement on demand (DOD) is a system designed to turn off half an engine’s cylinders when cruising, in an effort to save gas and decrease emissions.
		“The (DOD) controller monitors such things as oil temperature, rpm, coolant temperatures and throttle position and determines when to drop cylinders and vice versa.”[3] It is an effective system that works without being obvious to the user.
		Since the general engine properties are that of the smaller engine, its size can be increased without too much of a negative effect on fuel efficiency and emissions.
	www.pitt.edu /~jpp15/individual/trends.html (918 words)

	From V-8 to four-banger on demand - May. 27, 2003 (Site not responding. Last check: 2007-11-05)
		GM (GM: Research, Estimates)'s first displacement-on-demand (DOD) engines will be 5.3-liter V-8s in the midsize 2005 Chevrolet TrailBlazer and GMC Envoy XL and Envoy XUV sport-utility vehicles.
		For 2006, DOD technology will be added to a pair of new 3.5- and 3.9-liter V-6s for use in midsize passengers cars, and by 2008 GM says it will have more than 2 million DOD V-6 and V-8 engines in its mid- and full-size cars, trucks, sport utility vehicles and vans.
		DOD increases mileage by at least 8 percent by using only half the engine's cylinders in most driving conditions, GM said.
	money.cnn.com /2003/05/23/pf/autos/displacement/index.htm (352 words)

	GM Unveils 3 Pickup Tricks - Popular Mechanics
		Displacement on Demand runs the engine on all eight cylinders during most driving conditions, but when less power is needed, the system switches to four-cylinder operation.
		GMC engineers claim that work trucks such as the type contractors drive are ideal vehicles for the Displacement on Demand system.
		GM will introduce the Displacement on Demand system in 2004 models equipped with V8 engines.
	www.popularmechanics.com /automotive/new_cars/1266566.html?page=3 (523 words)

	Displacement On Demand: Part I, Golen Engine Service Creates a Bigger and Better LT1
		The biggest difference between the packages is the displacement and the rotating assembly.
		The mildest of Golen's LT1 packages, which maintains the stock displacement of 350 cubic inches, uses a performance ground stock crankshaft, shotpeened GM forged steel rods, Speed Pro Hypereutectic pistons and Plasma-Moly rings.
		At the other end of the spectrum are the competition packages, which use Eagle or Callies forged cranks increasing displacement to either 383 or 396ci, as well as SRP forged pistons and Eagle forged connecting rods depending on the application.
	www.golenengineservice.com /html/gmhtp_1a.html (624 words)

	Green Car Congress: The G6 Giveaway, Fuel Economy and the Competition
		The first is just the quick ratio of horsepower to engine displacement (the number (3.5L) used to indicate the combined volume of the portion of the cylinders into which the air/fuel mixture flows during the engine cycle).
		But GM has slated this engine model (named the 3900 or LZ8) to be the first V6 with Displacement on Demand (DoD)—the feature that deactivates three of the six cylinders under certain driving conditions to reduce fuel consumption.
		Chrysler uses its version of displacement on demand, or cylinder deactivation, in the Chrysler 300.
	www.greencarcongress.com /2004/09/the_g6_giveaway.html (1306 words)

	CanadianDriver: Test Drive - 2005 GMC Envoy XL with "Displacement-On-Demand"
		This innovative system helps to extend the vehicle's operating range by automatically deactivating four of the engine's eight cylinders (much like the system Daimler-Chrysler uses in their Hemi-equipped 300C and Magnum RT) when the vehicle is cruising along at highway speeds and there is no apparent need to keep the engine's entire power-band on tap.
		Most drivers wouldn't even know DOD was in operation if they weren't informed that the system was present, as it is so well integrated that the motor behaves like a normal V8 under most conditions.
		The throaty rumble emitted from the exhaust system sounds the same as that of a regular V8 so it won't give DOD's presence away, and acts to remind you that there is plenty of power under the hood.
	www.canadiandriver.com /articles/rp/05envoy_dod.htm (2388 words)

	Active Fuel Management - Wikipedia, the free encyclopedia
		Active Fuel Management (formerly known as Displacement on Demand) is a trademarked name for the automobile variable displacement technology from General Motors.
		In the U.S., high-powered multi-cylinder internal combustion engines are perceived to be necessary to satisfy driver demands for quick acceleration, oversized vehicles and/or heavy towing capacity, but during daily use they are generally operated at power settings of less than 25%.
		Later that year, GM debuted Opel Signum² concept car in Frankfurt Auto Show, which uses the global XV8 engine with displacement on demand.
	en.wikipedia.org /wiki/Displacement_on_Demand (793 words)

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