two and four stroke diesel engine

two and four stroke diesel engine -

1. TWO &FOUR STROKE DIESEL ENGINE SUBMITTED TO- PROF.SANDHYA MALHOTRA NAME - ANKIT SHARDA ROLL NO -6025

2. TWO &FOUR STROKE DIESEL ENGINE

3. 2 STROKE DIESEL ENGINE INTRODUCTION A  two - stroke diesel engine  is a  Diesel engine  that works by combining what is normally four cycles – intake, compression, combustion, and exhaust into only  two strokes  (one revolution) of the  engine . It was inventedby Hugo Güldner in 1899 .   In a two-stroke engine, the end of the combustion stroke and the beginning of the compression stroke happen simultaneously, with the intake and exhaust (or  scavenging ) functions occurring at the same time .

4. BASIC PART OF 2 STROKE DIESEL ENGINE The parts of a 2-stroke petrol engine include: 1.Fuel injector. 2.Cylinder. 3.Cylinder head. 4.Spark plug. 5.Crank. 6.Crankshaft. 7.Crankcase. 8.Connecting rod.

5. Cycle of 2 stroke engine When it comes to the parts and function of a 2-stroke engine, there are two cycles. 1. First Stroke (Suction and Compression ) During this cycle, the piston moves from the bottom center to the top center, and all three ports — inlet, transfer and exhaust — are closed. The charge above the piston is compressed, and the spark plug ignites the charge and creates a power stroke. That power is transferred with the help of the connecting rod to the crankshaft.  There is also a partial vacuum created in the crankcase, which opens the inlet port and allows the fuel 222 2. second stroke (compression and inlet ) During the second cycle, the piston moves down from the top center, and the inlet port is closed. The downward motion of the piston pushes the fuel-air mixture, and the charge from the crankcase comes out through the transfer port. Because the exhaust port is open, most of the exhaust gas leaves the cylinder. The exhaust gas that remains is pushed through the exhaust port by the pressure of the fuel-air mixture flowing downward. Then, with the help of a fresh charge, the exhaust gas is pushed out.  The parts of a 2-stroke petrol engine work this way, and the parts of a 2-stroke diesel engine work similarly except it has a fuel injector instead of a spark plug. 

6. 4 STROKE DIESEL ENGINE

7. INTRODUCTION A diesel engine ia an internal combustion engine . It convertes gasoline into motion It is the most common car engine type It is releatively efficient The engine workd on the principle of diesel cycle RUDOLF CHRISTIAN KAREL DIESEL ( inventerd by) .

8. PARTS OF FOUR STROKE DIESEL ENGINE Piston In an engine, a piston transfers the expanding forces of gas to mechanical rotation of the crankshaft through a connecting rod. Crankshaft A crankshaft is a part that converts the reciprocating motion to rotational motion. Connecting Rod It transfers motion from a piston to crankshaft acting as a lever arm Flywheel The flywheel is a rotating mechanical device that is used to store energy. Inlet and Outlet Valves It allows us to enter fresh air with fuel & to exit the spent air-fuel mixture from the cylinder. Spark Plug It is a device that delivers electric current to the combustion chamber which ignites the air-fuel mixture leading to the abrupt expansion of gas.

9. WORKING OF FOUR STROKE DIESEL ENGINE 1. Intake : Also known as induction or suction. This stroke of the piston begins at top dead center (T.D.C.) and ends at bottom dead center (B.D.C.). In this stroke the intake valve must be in the open position while the piston pulls an air-fuel mixture into the cylinder by producing vacuum pressure into the cylinder through its downward motion. The piston is moving down as air is being sucked in by the downward motion against the piston

10. 2. COMPRESSION STROKE Compression : This stroke begins at B.D.C, or just at the end of the suction stroke, and ends at T.D.C. In this stroke the piston compresses the air-fuel mixture in preparation for ignition during the power stroke (below). Both the intake and exhaust valves are closed during this stage.

11. POWER STROKE Combustion : Also known as power or ignition. This is the start of the second revolution of the four stroke cycle. At this point the crankshaft has completed a full 360 degree revolution. While the piston is at T.D.C. (the end of the compression stroke) the compressed air-fuel mixture is ignited by a  spark plug  (in a gasoline engine) or by heat generated by high compression (diesel engines), forcefully returning the piston to B.D.C. This stroke produces mechanical work from the engine to turn the crankshaft.

12. EXHAUST STROKE Exhaust : Also known as outlet. During the  exhaust  stroke, the piston, once again, returns from B.D.C. to T.D.C. while the exhaust valve is open. This action expels the spent air-fuel mixture through the exhaust valve.

13. VALVE TIMING DIAGRAM  A= Intake; B= Compression; C= Power; D= Exhaust; FIRING ORDER – 1-3-4-2 AND 1-2-4-3.

14. DIAGRAM OF 4 STROKE DIESEL ENGINE

15. DIAGRAM OF 4 STROKE DIESEL ENGINE

16. Video for 4 stroke diesel engine