To avoid vibration or noise, the engine computer alternates
the deactivated cylinders.
The big upgrade in the new model, beyond ride and handling, is that DFM, which GM engineers developed with Thula based on that company's Skipfire system,
deactivates cylinders in any combination from eight down to two, while the outgoing AFM only switches between eight and four.
Even with the V8 power, the engine will deliver even higher fuel economy with its ability to
deactivate cylinders.
To achieve this Prius - like fuel economy, the BlueMotion Concept is equipped with an Active Cylinder Management (ACM) technology that
deactivates cylinders two and three under light loads, and a stop / start system that shuts off the engine when the car comes to a stop.
The cylinder deactivation solenoids will
deactivate cylinder 1, cylinder 4, cylinder 6, and cylinder 7, and it does this by restricting the flow of oil to the valve lifters for these cylinders, and then preventing the intake valves and exhaust valves from opening.
There's also variable cylinder management (VCM), which electronically
deactivates cylinders to reduce fuel consumption.
At low to moderate load and engine speed,
this deactivates cylinders two, three, five and eight by closing their valves and shutting off fuel injection.
Cylinder deactivation, for instance, could be made much more fuel efficient if the intake valve could be opened on every downstroke and the exhaust valve opened on every upstroke of
the deactivated cylinder or «dead hole».
Not exact matches
The new 1.5 - litre TFSI is also available with
cylinder - on - demand, which
deactivates two
cylinders under light throttle loads.
I can't even hear the direct - injected,
cylinder -
deactivating engine despite its 355 hp and 383 lb - ft of torque.
To improve fuel economy, the engine in the Bentley Bentayga V8
deactivates four of its eight
cylinders in situations that don't demand full power.
In its final form, the Accord's V - 6 engine was equipped not only with the i - VTEC variable camshaft profile system, but with Variable
Cylinder Management (VCM) which
deactivates three
cylinders in light - load situations, resulting in EPA gas mileage ratings of up to 21 mpg city, 33 mpg highway, and 25 mpg combined when paired with its six - speed automatic transmission.
The direct - injected,
cylinder -
deactivating LT4 generates 630 lb - ft of torque with 9.4 psi of broad - spectrum supercharged boost.
Naturally aspirated 5.7 - and 6.4 - liter versions can
deactivate four
cylinders to conserve fuel.
If you are one of those strange supercar owners who fret over fuel efficiency, the Huracán Spyder packs a «
cylinder - on - demand» feature that
deactivates one bank of
cylinders.
In the partial - load range,
cylinders two, three, five and eight are
deactivated, which crucially reduces the fuel consumption.
There's always a price to pay when driving a large - by - huge ute, although the V8 seamlessly
deactivates half its
cylinders under light load to save a bit of gas.
The 5.3 L V8 sports the impressive active fuel management feature that
deactivates four of the eight
cylinders and propels the vehicle on just four
cylinders in instances where extra power is not needed.
It can even
deactivate four
cylinders when cruising under light throttle loads, via two - stage sliding cams.
The
cylinder on demand (COD) system, which
deactivates four
cylinders under part load, and a start - stop system make the sonorous eight -
cylinder unit very efficient.
V - 8, 16 - valve, variable - valve timing, push rod operated overhead valves, eight
deactivating and eight hydraulic lifters w / roller followers, deep - skirt cast - iron block, 356 aluminum
cylinder heads w / hemispherical combustion chambers
When full engine capacity is not required, five of the ten
cylinders are temporarily
deactivated by switching off one
cylinder bank.
Also, it'll
deactivate two
cylinders on the engine when you're just on the highway cruising.
The
cylinder on demand (COD) system, which
deactivates four
cylinders under part load and a start - stop system make the sonorous eight -
cylinder engine very efficient.
It can
deactivate those four
cylinders between 900 and 3250rpm in C and E driving modes, dependant on throttle position.
And when speed is not the issue, the V10
deactivates five
cylinders to save fuel and lower emissions.
On the fly, DFM switches the
cylinders that
deactivate so all
cylinders get the same amount of load and wear.
Delivering the power of a HEMI V8 with the efficiency of a four -
cylinder engine, Fuel Saver Technology uses sensors to detect when full power isnt necessary (typically during highway cruising) and
deactivates four of the eight
cylinders for improved efficiency.
The 2017 Dodge Charger offers Fuel Saver Technology, which automatically
deactivates four of the eight
cylinders when necessary, in order to increase fuel efficiency.
But when driving conditions are light, the engine will
deactivate 4 of the 8
cylinders, thereby changing from V8 to V4 mode.
The V8 versions come with AMG
cylinder management, which can
deactivate up to four
cylinders, depending on conditions, to save fuel.
That said, nobody considering the Yukon should expect much sympathy at the gas pumps — even using as light a foot on the gas pedal as possible in order to
deactivate four of the big V8's
cylinders, I averaged a swinish 17.6 L / 100 km (premium fuel recommended) during my time with the tester, the bulk of my driving suburban use.
The Hemi V - 8, a relatively thirsty engine, will be made less thirsty by a Multi Displacement System, which
deactivates four of the eight
cylinders when their power isn't needed, essentially turning the V - 8 into a more economical four -
cylinder.
There are eight
cylinders present, which activates or
deactivates automatically according to the load and power demand.
I do like the ability to manually push the ECO button, which
deactivates two
cylinders in the 3.5 V6 for improved mileage, up to 25 miles per gallon freeway with All - Wheel Drive.
The available 3.5 - liter, 24 - valve SOHC i - VTEC ® V - 6 engine produces 271 - horsepower and takes advantage of Variable
Cylinder Management ™ (VCM ®) technology that can
deactivate up to half of the
cylinders while cruising to improve fuel economy.
It
deactivates four of the
cylinders on the V - 8 engines and two
cylinders on the V - 6 under light load conditions — operating the engines as a V - 4 — and seamlessly reactivates the
cylinders when the driver demands greater power.
The W12 promises 20.1 mpg thanks to
cylinder - on - demand tech designed to
deactivate the fuel injection and ignition on six
cylinders at lower speeds.
This engine has
cylinder - on - demand too,
deactivating four of the eight
cylinders.
The system uses oil pressure, controlled by the powertrain control module, to
deactivate the lifters on selected
cylinders, closing the valves for those
cylinders.
Under part load, it
deactivates four of the eight
cylinders for an efficiency gain that is particularly pronounced at moderate highway speeds.
But what if every
cylinder could be
deactivated to save fuel, only getting fuel and a spark when it's needed?
For 2008, a new generation of VCM provides the additional capability to selectively
deactivate either two or three of the engine's six
cylinders during cruising and deceleration (instead of three, exclusively).
The RS7 uses a raft of contemporary fuel - saving features, including automatic stop / start, brake - energy recuperation and a
cylinder - on - demand system that
deactivates four
cylinders via electromechanical actuators on partial throttle loads.
-
Cylinder deactivation: When less engine power is needed, such as in highway driving, the valves and fuel injectors in half the engine
cylinders are
deactivated.
The engine gets Merc's AMG
Cylinder Management cylinder deactivation system which deactivates four of the eight cylinders of the engine under partial load to aid fuel eff
Cylinder Management
cylinder deactivation system which deactivates four of the eight cylinders of the engine under partial load to aid fuel eff
cylinder deactivation system which
deactivates four of the eight
cylinders of the engine under partial load to aid fuel efficiency.
It closes off the intake and exhaust valves of
cylinders two and three up to the mid-load range, while at the same time
deactivating fuel injection.
When full engine capacity is not required, six of the twelve
cylinders are temporarily
deactivated by switching off one
cylinder bank.
VCM
deactivates the rear bank of
cylinders by using the i - VTEC (intelligent Variable Valve - Timing and Lift Electronic Control) system to close the intake and exhaust valves while the Electronic Control Unit (ECU) simultaneously cuts fuel to those
cylinders.
To save fuel, the engine utilizes Jeep's multidisplacement system, which
deactivates four
cylinders when all eight aren't needed.