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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 - PowerPoint PPT Presentation

Cylinder Deactivation

Cylinder DeactivationAshish PatwalContent IntroductionCylinder deactivation mechanismMethods used for cyllinder deactivationAdvantagesDisadvantagesKey players using cylinder deactivationFuture trendsConclusionBibliographyIntroduction Reducing fuel consumptionCutting emission of green house gasesReduce pumping lossesCylinders are shutdown during light load8-25% reduction in fuel consumption


Cylinder deactivation mechanismCoolant temperature, vehicle speed, engine load parameters.Disable inlet/exhaust valves, spark plug, fuel.Disable after power stroke to have a gas spring.Lifter Oil Manifold Assembly, solenoid control valves.

Methods used for cylinder deactivationLifter Pin Control Mechanism (General MotorsVariable Profile Cam shaft (Lotus Automotive System)Active Valve Train Technology

Lifter Pin Control MechanismComponents:Electronic Control ModuleSolenoid valvesHydraulic subsytemLifter locking pin mechanism

Electronic Control ModuleMeasuring multiple instantaneous eventsControl solenoid valve of the lifter pin mechanismDynamic response for coordinating the deactivation hardware with other engine control functions.Dynamic response:solenoid plunger, hydraulic subsytem, lifter locking pinSolenoid Valve operation

Solenoid valve operationControl cylinder deactivationCommon port of the solenoid control valve connected to the locking pins inside the valve lifterCommon portEngine oil pressure: deactivationEngine sump: activationLocking Pin MechanismLost motion: engine oil pressure is applied spring based locking pins inside the lifterDeactivation is done on the camshaft of the base circle.Transition from v8 to v4 mode in one cycle.

Methods used in LPCMCylinder bank controlIndividual cylinder controlControl type: control algo in ecmCylinder deactivation: engine firing order even firing orderCylinder mode: 2 cylinder deactivate at same time

Bank modeBoth cylinder from each bank switched same time. Two control valves requiredUsed in v engines, Boxer engines.Switching window is half of the invidual cylinder mode.

AdvantagesIncreased fuel efficiency (10-20%)Decreased emissions from deactivated cylindersBetter breathing capability of the engine, thereby reducing power consumed in suction stroke.DisadvantagesEngine balancing. Increased cost of manufacturingOverall increase in weight

Key PlayersGENERAL 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 enginePORSHE and SUBARU: Uses lotus designed various cam plus which works almost similar to V-tech engineMercedes-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 DCs 5.7L Hemi V-8 and GMs 3.9L V-6.Eaton Automotive: supplies a portion of the LOMAs and switching lifters for GMs 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 GMs 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 TrendsResearch 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. Conclusion 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. Bibliography Automotive Industries Ltdwww.wikipedia.comResearch paper published by Quant Zheng , Delphi MotorsSociety of Automobile Engineers (SAE) Technical papers

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