1 / 46

4 Stroke Engine cycle

4 Stroke Engine cycle. Part 1. http://www.youtube.com/watch?v=4HPV73v7Ub8. 4 Stroke Engine cycle. Engine displacement. A cylinders displacement is the volume of the cylinder when the piston is at BDC. It is the sum of the displacement of each cylinder.

Télécharger la présentation

4 Stroke Engine cycle

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. 4 Stroke Engine cycle Part 1 http://www.youtube.com/watch?v=4HPV73v7Ub8

  2. 4 Stroke Engine cycle

  3. Engine displacement • A cylinders displacement is the volume of the cylinder when the piston is at BDC. • It is the sum of the displacement of each cylinder. • It is defined as the volume of air/fuel mixture an engine can draw in.

  4. Engine displacement Ex: 700 cc (cubic centimetres) 1000 cc = 1 Litre

  5. Engine displacement Example : Vehicle has 4 cylinders : Each cylinder has a volume of 700cc : 700cc X 4 = 2800cc : 2800cc = 2.8 Litre

  6. Torque • Torque is the term used to describe a rotating force. • More torque generally means a car can accelerate faster • Torque is the actual reading of how “hard” and with how much “Force” the engine turns.

  7. Horsepower • Horsepower: 1 hp = 33,000 lb-ft / min • One horsepower is the ability to lift 33000 pounds one foot in one minute • The horsepower specification for an engine tells you how much power the engine can produce.  • Horsepower is the rate at which the engine does work

  8. Horsepower calculations Formula: • HORSEPOWER = (TORQUE * RPM) / 5252 • A engine that makes 300 pound-feet of torque at 4,000 RPM produces • [(300 x 4,000) / 5,252] 228 horsepower at 4,000 RPM

  9. Torque and Horsepower • Think about: • Torque being how hard you can pound away on bicycle pedals • Horsepower being how fast you can spin the bicycle pedals.

  10. Recap • What is engine displacement? • What is horsepower? • What is Torque? • What are the different parts of an engine?

  11. The 4 stroke cycle • http://www.youtube.com/watch?v=60QX5RY_ohQ&feature=related • Part 2

  12. The four-stroke engine Spark plug Exhaust valve Inlet valve Cylinder Piston

  13. Piston, connecting rod, crankshaft • Is a can-shaped part closely fitted inside the cylinder. • Piston rings consist of compression rings and oil rings. • Crankshaft takes the up-down motion of the piston and convertors it to a rotation motion • Connecting rod connects the piston to the crankshaft.

  14. What is the 4 Stroke cycle? • The 4 Stroke engine cycle consist of these: 1) Intake 180degree 2) Compression 180 degree 3) Power/ Combustion 180 degree 4) Exhaust 180 degree • Total engine revolution 720 degree • One complete engine cycle consists of 4 engine strokes.

  15. Intake • The Intake Stroke consist of the piston travelling down. • Intake valves are open to allow Air/Fuel mixture to come into the combustion chamber.

  16. Intake system • Intake plastic ducts • Intake manifolds

  17. Intake system

  18. Intake system • Fuel injectors are electronically controlled valves that spray fuel to mix with air. • Creating that air fuel mixture

  19. Spark plugs • It is an electrical device that fits into the cylinder head and ignites air fuel mixtures.

  20. The four-stroke engine Inlet valve open Exhaust valve closed INTAKE STROKE

  21. The four-stroke engine Inlet valve open Exhaust valve closed INTAKE STROKE Piston down

  22. The four-stroke engine Fuel in Inlet valve open Exhaust valve closed INTAKE STROKE Piston down

  23. The four-stroke engine Fuel in Exhaust valve closed Inlet valve open INTAKE STROKE Piston down

  24. Recap • What is the purpose of the intake system? • What is the purpose of the spark plug? • What is the purpose of the fuel injector? • What is happening during the intake stroke?

  25. 4 Stroke engine • Part 3 • http://www.youtube.com/watch?v=q4Bk2TJJ6TM

  26. Compression • Compression stroke consist of the piston travelling back up. • Both intake and exhaust valves are closed • Air fuel mixture is now being compressed

  27. The four-stroke engine Piston up Exhaust valve closed Inlet valve closed COMPRESSION STROKE

  28. The four-stroke engine Piston up Inlet valve closed Exhaust valve closed COMPRESSION STROKE

  29. The four-stroke engine Piston up Inlet valve closed Exhaust valve closed COMPRESSION STROKE

  30. Combustion/Power • The piston is now at the TDC • Spark plug ignites, creating a spark that ignites the compressed air fuel mixture. • Explosion is created and the piston is forced back down. • Hence the Power stroke • Both valves are still closed

  31. The four-stroke engine Inlet valve closed Exhaust valve closed BANG POWER STROKE

  32. The four-stroke engine Inlet valve closed Exhaust valve closed Piston down powerfully POWER STROKE

  33. The four-stroke engine Inlet valve closed Exhaust valve closed POWER STROKE Piston down powerfully

  34. The four-stroke engine Inlet valve closed Exhaust valve closed POWER STROKE

  35. Exhaust • Exhaust stroke the piston is travelling up • Exhaust valve is open • Intake valve is Closed • Exhaust gases being pushed out by piston

  36. The four-stroke engine Inlet valve closed Exhaust valve closed EXHAUST STROKE

  37. The four-stroke engine Piston up Inlet valve closed Exhaust valve open Exhaust gases out EXHAUST STROKE

  38. The four-stroke engine Piston up Inlet valve closed Exhaust valve open Exhaust gases out EXHAUST STROKE

  39. The four-stroke engine Inlet valve open Exhaust valve closed INTAKE STROKE

  40. And so the cycle continues!!

  41. Exhaust system • The exhaust system is needed to provide a pathway for exhaust fumes to be filtered and to reduce noise. • Exhaust manifold • Catalytic convertor • Muffler

  42. Recap • What is the purpose of the compression stroke and what is happening • What is the purpose of the power stroke and what is happening? • What is happening during the exhaust stroke? • What is the purpose of the exhaust system?

  43. Video of 4 Stroke cycle http://www.youtube.com/watch?v=IYWUWMmimjQ&feature=related http://videos.howstuffworks.com/auto/car-parts-videos-playlist.htm#video-30374

  44. QUIZ

  45. 4 Stroke cycle • http://www.youtube.com/watch?v=YB_JCUw9SoU&feature=related

More Related