1 DIESEL ENGINE Teknik Kendaraan Ringan Semester 5 th Class XII Kompetensi Kejuruan SK-KD 5 TH

DIAGRAM ALUR PENCAPAIAN KOMPETENSI

Teknologi dan Rekayasa DIESEL ENGINE  In 1894, German inventor Rudolph Diesel developed the first single- cylinder diesel engine.  He signed a multi-million dollar deal with Adolphus Busch, head of brewery empire, to manufacture the diesel engine.  However, he lost his fortune, and in 1913, mysteriously was found dead after going overboard a boat. Suicide was one speculation, but also assassination by Kaiser Wilhelm’s agents, fearing that Diesel, with WW I looming, would sell the engine to England 3

Teknologi dan Rekayasa The Combustion Cycle  The four-stroke combustion cycle of the diesel engine is composed of the intake stroke, compression stroke, power stroke, and the exhaust stroke.  The diesel engine operates through the motion of compression pistons in inside the cylinders of the engine.  Pistons inside the cylinders are connected by rods to a crankshaft. As the pistons move up and down in their cylinders, they cause the crankshaft to rotate.  The crankshaft’s rotational force is carried by a transmission to a drive shaft, which turns axles, causing the wheels to rotate. 4

Teknologi dan Rekayasa The Intake Stroke  During the intake stroke, the intake valve opens as the piston moves down to allow air into the cylinder.  The air is pushed by atmospheric pressure into the cylinder through the intake valve port. 5

Teknologi dan Rekayasa The Compression Stroke  After the piston reaches its lower limit, it begins to move upward and as the piston moves up, the intake valve closes.  The exhaust valve is also closed, so that at this point in the cycle, the cylinder is sealed.  As the piston moves upward, the air is compressed and the compression of the air causes the pressure and the temperature of the cylinder to increase. 6

Teknologi dan Rekayasa The Power Stroke  As the piston reaches maximum compression of the air, diesel fuel is injected to the combustion chamber filled with compressed air.  The heat of the compressed air ignites the fuel spontaneously at the self-ignition temperature of the fuel.  As the cylinder pressure increases, the piston is forced down into the cylinder.  The power impulse is transmitted down through the piston, through the connecting rod, and to the crankshaft, which is rotated due to the force. 7

Teknologi dan Rekayasa The Exhaust Stroke  As the piston reaches the bottom of its stroke, the exhaust valve opens.  As the piston moves up on the exhaust stroke, it forces the burned gases out of the cylinder through the exhaust port.  Then as the piston reaches the top of its stroke, the exhaust valve closes, and the intake valve opens.  The cycle repeats again with the intake stroke. 8

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Efficiency  One positive aspect of the diesel engine is that they are thermally efficient.  The improved efficiency is caused by the relatively high compression ratios  The diesel engine is 54% thermally efficient, while gasoline engines are only 34%.  As a result of diesel engines thermally efficiency, they are able to achieve better gas mileage because they produce greater horsepower output for fuel intake. 10

Teknologi dan Rekayasa Fuel Economy  One main reason for the diesel engine’s excellent fuel economy is that it burns far more air than fuel.  In a gasoline engine, it’s air intake is carefully restricted and controlled by the carburetor for a 15:1 air to fuel ratio.  However, in the diesel engine, the air intake is unrestricted. 11

Teknologi dan Rekayasa Durability  Diesel engines are also capable of running high miles without major engine work.  Truck diesel engines can run 250,000 or even 500,000 miles without major engine work.  In 1978, Mercedes-Benz launched a “Great Diesel Search” to find the highest mileage diesel in the United States.  Robert O’Reilly drove his 1957 Mercedes-Benz 180D 1,184,000 miles, 750,000 on its original engine.  Another owner drove his 1968 Mercedes-Benz 220 D 912,000 miles, 902,000 miles on its original engine. 12

Teknologi dan Rekayasa Compression Ratio  The diesel engine compresses at a very high ration of 14:1 to 25:1.  The higher the compression ratio, the more power is generated.  The main limiting factor to compression ratio is based on the knock limits of the fuel.  Knock is the term used to describe the auto ignition that occurs when a fuel ignites because the pressure in the cylinder is such that combustion occurs.  The knock limit of the fuel is determined by the point at which the engine begins to shake.  The higher the knock limit, the higher the compression ratio, the more power is generated. 13

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Teknologi dan Rekayasa Advantages of a Diesel Engine  Low maintenance, greater efficiency, high power output, and better fuel economy under all types of loads.  Does not require a spark plug to ignite fuel, it relies on the spontaneous combustion through the heat of compression to ignite the diesel fuel.  Because of this type of combustion, a diesel engine are built more ruggedly and heavily built than the gas engine.  The ruggedness of the diesel engine gives a two to three times longer life than the gas engine, which has a life of around 100,000 miles. 15

Teknologi dan Rekayasa Disadvantages  Components of diesel engines are usually heavier that those of gasoline engines because of the additional structural strength needed to obtain the higher compression ratio and power output.  They can emit large amounts of ozone-forming constituents and particulates.  Because of diesel engines’ weight and compression ratio, they tend to have lower maximum RPMs than gasoline engines.  This makes diesel engines has high torque rather than high horsepower, and this tends to make cars with diesel engines slow in terms of acceleration. 16  Diesel fuel is not as readily available at all locations as gasoline tends to be.  Diesel engines are harder to start in cold weather conditions, because it is difficult to get the temperature inside the cylinder up to the self-ignition temperature of the diesel fuel.

Teknologi dan Rekayasa Emissions  The most harmful emission from diesel engines are the nitrogen oxides.  The problem of nitrogen oxide (NO) production in diesel engines comes from the early rapid burning, which produces very high-temperature products.  As a result of the pollutants from diesel engines, they are subject to increasingly stringent regulations that require continual improvements in the combustion process. 17

Teknologi dan Rekayasa Main Differences of Gas and Diesel  The main difference between a gasoline engine and a diesel engine is that in a diesel engine, there is no spark plug to ignite the fuel.  Diesel fuel is injected into the cylinder, and it ignites spontaneously as the heat and pressure of the compression stroke cause the temperature inside the cylinder to increase.  The other major difference between the two types of engines is in the gas mileage.  As a result of diesel fuel having a higher energy density than gasoline, diesel engines get higher gas mileage. 18

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Teknologi dan Rekayasa DIESEL COMPONENTS 20

COMBUSTION CHAMBER TYPE ( DIRECT INJECTION ) Teknologi dan Rekayasa Semi Spherical Type Spherical Type Multi Spherical Type 21

Teknologi dan Rekayasa SWIRL CHAMBER TYPE PRECOMBUSTION CHAMBER TYPE ( AIR CELL ) Glow Plug Nozzle Piston INDIRECT INJECTION TYPE 22

Teknologi dan Rekayasa IN – LINE INJECTION PUMP Feed Hole Control groove Driving face IN – LINE INJECTION PUMP 23

Teknologi dan Rekayasa VE : “ VERTEILER EINSPRITZ ) DISTRIBUTOR INJECTION PUMP ( VE ) 24

Teknologi dan Rekayasa DISTRIBUTOR INJECTION PUMP ( VE ) ( SCEMATIC ) 25

Teknologi dan Rekayasa From Fuel Tank To Injection Pump FUEL FILTER PARTS 1. Priming Pump 2. Filter 3. Water Sendimeter FUEL FILTER 26

Teknologi dan Rekayasa NOZZLE PARTS 1.Pressure spring 2.Nozzle Needle 3.Nozzle Body 4.Adjusting Shim NOZZLE 27

Teknologi dan Rekayasa PRE HEATING SYSTEM 28

Teknologi dan Rekayasa 29 Bibliography: Bosch Injection Pump Repair Book Toyota Technician, Toyota Astra Motor

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