FUEL SYSTEM(CONVENTIONAL TYPE)

TEKNIK KENDARAAN RINGANXI SEMESTER 4TH

Kompetensi KejuruanSK-KD 4 TH

DIAGRAM ALUR PENCAPAIAN KOMPETENSI

FUEL SYSTEM

FUNCTION

To supply fuel into the cylinder in accordance with the needs of the engine.

Fuel Tank

Fuel tanks made of metal plate, attached on the back of vehicles to avoid leakage in the event of collision. On the inside is coated with anti-rust coating, Sparator paired in the tank to prevent fuel down - up at the time the car running. End of the fuel suction pipe, placed a distance of 2 to 3 cm from the bottom of the tank, to prevent water and dirt sucked.

Fuel Line

There are 3 channels of fuel   Main channel to deliver fuel to the fuel pump   Back channel, to return excess fuel to tank   Channels for fuel emissions (to channel the gas to charcoal canister HC)

Fuel Filter

FUNCTIONTo separate the water and dust contained in gasoline. Filter function to reduce the flow rate so that the particles - particles heavier than the gasoline will be missed based on the filter Note : To a certain car automobile fuel filters, placed in the gas tank and put together with a fuel pump

FUEL PUMP

Note: There are 2 kinds of fuel pump, Machanical & Electric

MECHANICAL FUEL PUMP

ELECTRIC FUEL PUMP

Plunger type electric fuel pumpThis fuel pump far from the machine installed to prevent vapor lock

PLUNGER TYPE FUEL PUMP

EMERGENCY FUEL STOP SYSTEM ( EFSS )

EFSS DIAGRAM

Function: To prevent a fuel spill in the event of an accident, the condition of the engine ignition is off & the positions on

CARBURETOR

Function To establish / provide the fuel mixture in accordance with the engine working conditions.

PERBANDINGAN UDARA - BAHAN BAKAR DANKEMAMPUAN MESIN

Fuel ratio theory 14,7 : 1

Economic ratio16-18 : 1

Power air fuel ratio12-13 : 1

Power air fuel ratio12-13 : 1

PERBANDINGAN ENERGI UDARA DAN BAHAN BAKAR

Note: Mixture of air & fuel smallest can still burn = 20: 1

SISTIM PELAMPUNG

Function: To maintain the surface material ketiggian - high fuel floats in the room was calculated distance with the height of play nozle (h)

Settings float

If the gasoline from the fuel pump through a needle valve and a float into the space will buoy up the valve and the valve will stop the flow of fuel if the fuel valve off then will open again. Thus the height of a float in the space station remains constant

PENYETELAN PELAMPUNG

This setup is intended to get the height "h" How to measure the distance to the float body carburator using "measuring block" If the tool is not available Use Vernier caliper while blowing through the inlet channels, feeling his energy blast, if the heavy stop and read the size or can also use the diameter drill line with a float high specification "Adjust to specifications"

FLOAT HEIGHT MEASUREMENT

Nedle gap adjustment valve (needle valve) This setup is intended to get a wide opening of the valve opening nedle How to measure the distance between the valve lips nedle Spring on the nedle valve serves to absorb vibrations that the machine does not leak nedle

PENYETELAN PELAMPUNG

MEASUREMENT needle valve gap

PENYETELAN PELAMPUNG

How to make adjustments   To get a crack at the position nedle flex "A"   To get the correct height flex buoy on the "B"

CautionDo not change the position of lip, if this position will have changed the wrong setting

PART that was changed

PIPA VENTILASI UDARA ( AIR VENT TUBE )

The amount of fuel issued by the main subject nozle pressure difference between the "A", "B" and "C" Pressure between the "B" buoy room & "C" water should be the same horn, while the pressure on the area "C" is lower than outside air pressure (atmospheric)

Note: If the air filter clogged (blocked), buoys space leaky gasket, clogged ventilation pipe it will be a flood karbuartor.

SALURAN PADA CARBURATOR

Low speed ( barel I )

LOW SPEED

The relation between the amount of gasoline released by Port & Slow Idle port as shown in the graph as well

At low spinning machine vacuum under throtlle valve larger than the above throtlle valve, so that the fuel out through the existing channels under the valve throtlle

IDLE MIXTURE ADJUSTING SCREW

Function: To set the ratio of fuel capuran issued by the "slow-jet" with air (CO setting) so that the ratio of air and fuel at Idle 12:1

Note: Do not tighten the idle mixture screw too hard, because it will mislead Idle Screw become disabled As a result we will find it hard to get a tuning ratio of air and fuel at idle.

PEMILIHAN SCREW DRIVER ( OBENG )

Note: To avoid damage to the components that we will open, use a screwdriver to fit the width and size of components that we open, If we use a screwdriver that is too small will cause the components to be damaged

SLOW JET

Function To control the amount of fuel that flows in the main channel Primary

EKONOMIZER JET, AIR BLEEDER & SOLENOIDE VALVE

Economizer Jet Function: to accelerate the flow of air to obtain a mixture of gasoline and air is good, the way minimize the diameter of the hole,

Air Bleeder Function: to assist the process of atomization of the gasoline so you can easily mix with air. If the water is clogged bleeder mixture of air and fuel will become too rich (gasoline will drip pad port idle & slow)

Solenoide valve Function: to stop the supply of fuel through the primary channel at low speed ignition is turned off, so that no occurrence of interrupted

Main jet Main jet functions: To limit the amount of fuel provided by a high speed primary / secondary

MAIN JET

Function: To assist the process of atomization of the gasoline so you can easily mix with air. If the water is clogged bleeder mixture of air and fuel will become too rich (gasoline will drip pad port idle & slow)

AIR BLEEDER

PRIMARY HIGH SPEED LINES

Function: This channel is designed to provide a mixture of fuel and air in the ratio of 16-18: 1 (a mixture of air & fuel economy)

This condition is performed when the vehicle was running at high speed during normal engine conditions. To get more power on the condition of the channel is provided by the acceleration / acceleration booster circuit and power / power circuit

Air flow diagram

SALURAN KECEPATAN RENDAH SECUNDER ( SECONDARY LOW SPEED CIRCUIT )

Function: To overcome delays in the supply of gasoline to the engine at the beginning of high-speed channel secunder work,

How it works: At secunder start throtle valve open, air flow through the secondary venturi move slowly, as a result of gasoline out of the game nozle little, a mixture of air and fuel to be thin. To overcome this, the primary open throtle little throtle secondary, with secondary mechanisms toutch angel by kickup kevacuuman arise as a result of slow secondary port and causes gas to flow

SALURAN KECEPATAN TINGGI SECUNDER( SECONDARY HIGH SPEED CIRCUIT )

Note To open the throtle used sekundari diaphragm or pendulum weights

High speed secondary channel is designed to work out if the engine requires a higher rev the venturi size, main jet, nozle & jet, jet made greater

Contacts

ContactsLever “ A “

Lever “ B “

Lever “ C “

Rod “ D “

Spring

Secondary Throtle

Secondary touch angle

SECONDARY TOUCH ANGLE

Secondary touch angle Mechanism is made in such a way that throtle valve will begin to open when the primary valve open throtle at 55o - 65o (angle is called the secondary touch angle)

How it works:

If the primary open throtle less than 55o - 65o then the lever B would be lifted by the spring, though diapragm interesting result Rod liver C D above will not spin. If the primary throtle opened more than 55o - 65o A lever then rotates counter-clockwise and push lever B, so the liver C throtle move freely and be open throtle secondary

KICK – UP MEKANISM

Function: To keep the throtle valve secondary traffic jam by the deposition of carbon (carbon deposits)

This gap measurements made between the carburetor and secondary body throtle valve

POWER CIRCUIT ( SALURAN TENAGA )

Channels Power (Power Circuit) Primary high-speed channel is designed to compare the economic If the engine must produce more power there must be additional fuel is supplied to the high-speed channel hinga Primary air ratio and fuel to be 12-13:1

ACCELERATION CIRCUIT ( SALURAN AKSELERASI / PERCEPATAN )

When you step on the gas pedal arrived - arrived kemesin incoming air will increase rapidly and gasoline will be too late, this is because gasoline is more severe than in air, To overcome this, the carburetor so that pecepatan channel dibuatlan fuel ratio and the air became 8:1

Note In addition to accelerating pump piston model there is also a model acceleration diaphragm pumps as installed in Daihatsu Zebra, as well Cheers

CHOOKE SYSTEM ( SISTIM CHOOKE )

Function: When the engine is still cold, petrol can not evaporate well and stuck to the wall of intake manifold, so that the mixture of fuel and air into the cylinder becomes thin, the result becomes difficult for the machine is turned on. Chooke system makes the mixture of air and fuel in the ratio of 1:1,

• Chooke valve has 2 kinds Normal model (manual), operated by pulling the cable Chooke automated, this type of valve chooke will operate by itself if the engine cold,  Chooke automatic valve there are 2 kinds, namely: Operated by using pendingi water and electrically-operated

CHOOKE SYSTEM

Water heating system:

Automatic Chooke wax model, how it works using hot water from engine cooling water. The opening of the expansion valve based chooke wax (wax) which then pushed the lever chooke accordance with increasing engine cooling water temperature.

CHOOKE SYSTEM

Electrical System: In this system is equipped with a bimetallic chooke, heated with electric heat coil, opening the valve chooke based expansion due to heat heat bimetallic coil which is connected to terminal "L" alternator if the alternator using the IC regulator or to the terminal "N" if the alternator voltage regulator using the model platinum. Current into the heat coil is limited to use PTC (positive Temperature Coefisient thermistor) to prevent incoming overcurrent.

FAST IDLE MECHANISM

Function: To increase the engine idling rotation during cold engine operation chooke valves for the machine to live well. By the way throttle valve to open slightly.

UNLOADER

Function: To open a little valve at the valve chooke operate and step on the gas pedal in a deep aim to prevent fuel and air mixture is too rich due to lack of air at the time step on the gas pedal.

THROTTLE POSITIONER ( TP )

Function: To prevent the throttle valve is suddenly closed at the time the gas pedal is released suddenly. The objective is to reduce levels of CO & HC by preventing the throttle valve is suddenly closed. If this happens the gas will be sucked into the cylinder via ports & slow idle port. In addition there are also TP Dash Pot of functions and works the same way with TP

Dash Pot

Water Jacket Water Jacket

CHOOKE OPENER ( UNTUK MODEL TERTENTU )

Sistim ini dipasangkan hanya untuk model – model tertentu.

Fungsinya :Apabila terjadi kesalahan pada sistim automatic chooke yang mengakibatkan sistim tidak dapat bekerja, agar campuran udara dan bahan bakar tidak menjadi terlalu kaya, karena sistim chooke tidak dapat bekerja ( membuka ), maka chooke opener akan bekerja untuk membuka katup chooke.

CHOOKE BREAKER

Function: To open the valve slightly after the engine life chooke to a mixture of air and fuel is not too rich after the engine of life.

How it works: After engine start in cold temperatures, is still in chooke valve closed position. So that the mixture of air and fuel became too rich. To combat this, the choke valve should be opened slightly based on engine temperature. If the engine temperature below 17o C, so that work is diphragm "A" thus opening the valve is not too wide, When the engine temperature is above 17o C diaphragm "B" go to work This is made possible by the work of TVSV

HOT IDLE COMPENSATOR

Function: To add to the fresh air from the air horn (air filters) at the time of the heat engine to campuaran air and fuel is not too heavy due to fuel evaporation in the carburetor temperature caused by high engine room.

How it works: If the engine room temperature reaches 55o C or more, then the bimetallic will expand and open the air valve, so that fresh air can flow into the intake manifold to add air to fuel mixture does not become too fat.

CARBURATER SCEMATIC DIAGRAM ED 10 ENGINE

CARBURATER SCEMATIC DIAGRAM HD-C ENGINE

CARBURATER SCEMATIC DIAGRAM HC-C ENGINE ( “S” SERIES )

Bibliography:

Astra International

THANKS TO ASTRA INTERNATIONAL