Cylinder deactivation
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Cylinder Deactivation. Ashish Patwal. Content . Introduction Cylinder deactivation mechanism Methods used for cyllinder deactivation Advantages Disadvantages Key players using cylinder deactivation Future trends Conclusion Bibliography. Introduction . Reducing fuel consumption

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Cylinder Deactivation

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Cylinder deactivation


Ashish Patwal



  • Introduction

  • Cylinderdeactivationmechanism

  • Methodsused for cyllinderdeactivation

  • Advantages

  • Disadvantages

  • Key playersusingcylinderdeactivation

  • Future trends

  • Conclusion

  • Bibliography



  • Reducing fuel consumption

  • Cuttingemission of green house gases

  • Reducepumpinglosses

  • Cylinders are shutdownduring light load

  • 8-25% reduction in fuel consumption



Cylinder deactivation mechanism


  • Coolanttemperature, vehicle speed, engineloadparameters.

  • Disableinlet/exhaust valves, sparkplug, fuel.

  • Disableafter power stroke to have a gasspring.

  • Lifter Oil Manifold Assembly, solenoid control valves.

Methods used for cylinder deactivation

Methodsused for cylinderdeactivation

  • Lifter Pin Control Mechanism (General Motors

  • Variable Profile Cam shaft (Lotus Automotive System)

  • Active Valve Train Technology

Lifter pin control mechanism

Lifter Pin Control Mechanism


  • Electronic Control Module

  • Solenoid valves

  • Hydraulicsubsytem

  • Lifter locking pin mechanism

Electronic control module

Electronic Control Module

  • Measuring multiple instantaneousevents

  • Control solenoid valve of the lifter pin mechanism

  • Dynamicresponse for coordinating the deactivation hardware withotherengine control functions.

  • Dynamicresponse:solenoidplunger, hydraulicsubsytem, lifter locking pin

Solenoid valve operation

Solenoid Valve operation

Solenoid valve operation1

Solenoid valve operation

  • Control cylinderdeactivation

  • Common port of the solenoid control valve connected to the locking pins inside the valve lifter

  • Common port

    Engineoil pressure: deactivation

    Enginesump: activation

Locking pin mechanism

Locking Pin Mechanism

  • Lost motion: engineoil pressure isappliedspringbasedlocking pins inside the lifter

  • Deactivationisdone on the camshaft of the base circle.

  • Transition from v8 to v4 mode in one cycle.

Methods used in lpcm

Methodsused in LPCM

  • Cylinderbank control

  • Individualcylinder control

    Control type: control algo in ecm

    Cylinderdeactivation: enginefiringorder


    Cylinder mode: 2 cylinderdeactivateatsame time

Bank mode

Bank mode

  • Bothcylinderfromeachbankswitchedsame time.

  • Two control valves required

  • Used in v engines, Boxer engines.

  • Switchingwindowishalf of the invidualcylinder mode.

A dvantages


  • Increased fuel efficiency (10-20%)

  • Decreased emissions from deactivated cylinders

  • Better breathing capability of the engine, thereby reducing power consumed in suction stroke.



  • Enginebalancing.

  • Increasedcost of manufacturing

  • Overallincrease in weight

Key players

Key Players

  • GENERAL MOTORS: uses displacement on demand system which is said to save fuel by 20%

  • HONDA: Is conducting research to incorporate cylinder deactivation with its patented VTECH engine

  • PORSHE and SUBARU: Uses lotus designed various cam plus which works almost similar to V-tech engine

  • Mercedes-Benz: optional on certain European market V-8s since 1998; U.S. market V-12 mileage improved by a claimed 20 percent in 2001 and 2002 model years. Technology retired (in U.S.) with 2003 arrival of turbocharged V-12 engines.

  • INA: German bearing and valve train specialist supplies switching lifters for DC’s 5.7L Hemi V-8 and GM’s 3.9L V-6.

  • Eaton Automotive: supplies a portion of the LOMAs and switching lifters for GM’s 5.3L V-8. Also developing valve deactivation systems for light- and heavy-duty European diesel engines.

  • Siemens-VDO Automotive: exploring cylinder deactivation for possible future use. Delphi Automotive: supplies a portion of the LOMAs and switching lifters for GM’s 5.3L V-8.

  • Ford Motor Company: has investigated cylinder deactivation but no applications planned for near future.

  • Nissan and Toyota: no near-term plans to implement cylinder deactivation.

Future trends

Future Trends

  • Research is under progress for a new technology named as Active Valve Train Technology, which uses valve controls with high speed hydraulic actuators there by eliminating the use of Cam shaft.

  • Also a new technology called controlled auto ignition (CAI) which replaces the conventional spark plugs and fires at carefully timed moment to set the compressed charge of fuel alight.



  • The yell for a pollution free environment can be seen even now with developed countries the number of norms like EUROIII is there in the present world itself and the number of vehicles is increasing even under developed countries are planning to impose such norms Future world demands automobile which burn less fuel .Cylinder deactivation seems to be a good answer to this problem.



  • Automotive Industries Ltd


  • Research paper published by Quant Zheng , Delphi Motors

  • Society of Automobile Engineers (SAE) Technical papers

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