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Cylinder Deactivation Ashish Patwal. Content Introduction Cylinder deactivation mechanism Methods...

Date post:25-Dec-2015
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  • Slide 1
  • Cylinder Deactivation Ashish Patwal
  • Slide 2
  • Content Introduction Cylinder deactivation mechanism Methods used for cyllinder deactivation Advantages Disadvantages Key players using cylinder deactivation Future trends Conclusion Bibliography
  • Slide 3
  • Introduction Reducing fuel consumption Cutting emission of green house gases Reduce pumping losses Cylinders are shutdown during light load 8-25% reduction in fuel consumption
  • Slide 4
  • Introduction
  • Slide 5
  • Cylinder deactivation mechanism Coolant 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.
  • Slide 6
  • Methods used for cylinder deactivation Lifter Pin Control Mechanism (General Motors Variable Profile Cam shaft (Lotus Automotive System) Active Valve Train Technology
  • Slide 7
  • Lifter Pin Control Mechanism Components: Electronic Control Module Solenoid valves Hydraulic subsytem Lifter locking pin mechanism
  • Slide 8
  • Slide 9
  • Electronic Control Module Measuring multiple instantaneous events Control solenoid valve of the lifter pin mechanism Dynamic response for coordinating the deactivation hardware with other engine control functions. Dynamic response:solenoid plunger, hydraulic subsytem, lifter locking pin
  • Slide 10
  • Solenoid Valve operation
  • Slide 11
  • Solenoid valve operation Control cylinder deactivation Common port of the solenoid control valve connected to the locking pins inside the valve lifter Common port Engine oil pressure: deactivation Engine sump: activation
  • Slide 12
  • Locking Pin Mechanism Lost motion: engine oil pressure is applied spring based locking pins inside the lifter Deactivation is done on the camshaft of the base circle. Transition from v8 to v4 mode in one cycle.
  • Slide 13
  • Methods used in LPCM Cylinder bank control Individual cylinder control Control type: control algo in ecm Cylinder deactivation: engine firing order even firing order Cylinder mode: 2 cylinder deactivate at same time
  • Slide 14
  • Bank mode Both cylinder from each bank switched same time. Two control valves required Used in v engines, Boxer engines. Switching window is half of the invidual cylinder mode.
  • Slide 15
  • Advantages Increased fuel efficiency (10-20%) Decreased emissions from deactivated cylinders Better breathing capability of the engine, thereby reducing power consumed in suction stroke.
  • Slide 16
  • Disadvantages Engine balancing. Increased cost of manufacturing Overall increase in weight
  • Slide 17
  • 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 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.
  • Slide 18
  • 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.
  • Slide 19
  • 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.
  • Slide 20
  • Bibliography Automotive Industries Ltd www.wikipedia.com Research paper published by Quant Zheng, Delphi Motors Society of Automobile Engineers (SAE) Technical papers
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