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1、Welcome To,ENGINES OPERATION,SECTION 1,OBJECTIVES,Discuss four (4) stroke engine operation Discuss two (2) stroke engine operation Discuss diesel engine operation Define compression ratio Explain and Understand compression testing, leak down testing, and vacuum testing.,ENGINE OPERATION,DIESEL 4 str
2、oke,2 STROKE,GAS 4 STROKE,A V-6 engine with dual overhead camshafts,凸轮轴,凸轮,气门弹簧,进气门,排气门,活塞,连杆,曲轴,正时链,曲轴链轮,Terms of An Engine,Four strokes of the engine,进气冲程,压缩冲程,作功冲程,排气冲程,Engine block and lower end part,气缸,发动机缸体,活塞环,活塞,连杆,连杆端盖,连杆轴承,油底壳,曲轴,主轴承,Piston and piston rings,活塞,活塞环,连杆螺栓,连杆端盖,曲轴,连杆轴颈,连杆,活塞销,
3、Blowby occurs between the piston and cylinder,气缸壁,活塞,活塞间隙,泄漏（漏气）,Crankshaft and piston,活塞环,活塞,平衡重,轴承,连杆端盖,活塞销,连杆,曲轴,Air intake path,进气歧管,进气道,进气口,空气滤清器壳体,节气门体,Fuel system,燃油进油管,活性炭罐,燃油管,汽油分供管,汽油泵,燃油压力调节器,燃油箱,燃油喷射器,Lubrication system,通右气缸盖,通左气缸盖,机油泵,机油集滤器,主油道,机油滤清器,通曲轴主轴颈,(4) FOUR STROKE ENGINE OPERAT
4、ION,(1) INTAKE STROKE,Vacuum is Created On Intake Stroke,Intake,19 in. Hg,*,(2) COMPRESSION STROKE,Air/Fuel is Compressed 9 TO 1,*,(3) POWER STROKR,Combustion- Power Stroke,*,(4) EXHAUST STROKE,Exhaust,*,Exhaust,Intake,2 - Stroke Cycle Engine Operation,Combustion event takes place above piston while
5、 transfer (Fuel) takes place below piston (piston travels downward and forces air/fuel to top of piston) Compression takes place above piston while intake takes place below piston (piston travels upward) Therefore, each crankshaft revolution (360*) produces a power pulse. Plug sparks every time pist
6、on reaches TDC,/FUEL,COMPRESSION,INTAKE,1,REED VALVE CLOSES,Ignition,1,COMBUSTION FUEL BURN,POWER STROKE,2,AIR/FUEL TRANSFER,2,/FUEL,COMPRESSION,INTAKE,1,480cc,60cc,480 = 8 to 1 60,REVIEW,Name the four (4) strokes in a 4 cycle engine. 2. How many degrees of crankshaft rotation are required to produce one power stroke in a (2) cycle engine? In a (4) cycle? How many spark plugs per cylinder does a diesel use? How much difference in compression between cylinders is acceptable? Name (3) places air can escape on a leak down check On what stroke is vacuum created?,
