Download - Copy of Carburettion & Injection
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Engine Fuel System
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Petrol Engines
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Fuel/Air ratioThe purpose of the carburettor in case of Petrol Engines is to mix air and fuel, So the fuel/air ratio is theoretically 1:14,6. When the supply of airis more, the ratio gets higher than 1:14,6 i.e. a leaner mixture, there still will be some free oxygen left in the exhaust gases. If the supply of fuel is more than air the ratio gets below 1:14 i.e. a richer mixture,there will be no free oxygen left but some fuel will leave the engine unused.
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Carburettor
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Venturi-type Carburetor
P+1/2 V2 = Constant
Bernoulli Effect:
Constant level is maintained in bowl -as float moves down, valve stem moves down, allowing more fuel into bowl, float moves up and closes valve
Valve StemFuel Inlet
Float
Metering Orifice
Throttle Plate
Air/Fuel Mixture To Engine
Choke Plate
Fuel Nozzle
Inlet Air
Bowl
Atomized Fuel
Venturi
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Desirable Features
1 To meter & supply the correct amount of air fuel mixture ratios under all conditions of load & speed of the engine for
• Easily Starting
• Providing rich mixture forslow idling
• Providing rich mixture for aceleration
• Providing rich mixture for high speed
2 To operate satisfactorily during hot & cold weathers
3 To be robust
4 To withstand the density changes for varying altitudes.
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Main Systems
• Float System
• Idle System
• Main Metering System
• Power System
• Accelerator Pump System
• Choke System
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Float System
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Idle System
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Low Speed Operation
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Main Metering System
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Metering Rod Types
• Tapered
• Stepped
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Tapered Rod
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Stepped Rod
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Power System
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Accelerator Pump System
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Choke System
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Diesel Fuel System
In diesel fuel system only air is sucked into the cylinder during the intake stroke.
The combustion of fuel takes place as soon as the diesel is injected into the cylinder prior to power stroke.
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
The injection in case of diesel engine is executed with the help of Fuel Injection Pump(FIP)in conjunction to the nozzles /injectors.
The Main parts of the FIP are
• FIP driving gear
• FIP Cam Shaft
• Followers
• Plungers
• Barrels
• Retaining Springs
• Governor
• Spring Loaded rack arrangement
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Main Parts
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
No Delivery
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Full Delivery
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Partial Delivery
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Barrel
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Mechanical Injectors
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Nozzle
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Fuel Injection
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
Multi Point Fuel Injection(MPFI)
50 psi typical
Monitored Engine Operating Conditions:
Manifold PressureEngine Speed
Air TemperatureCoolant Temperature
Acceleration
COMPUTERTRIGGER
INJECTOR DRIVE UNIT
Pressure Regulator FuelFilter
Fuel Pump
FUEL TANK
Injectors
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CARBURETION & INJECTION Copyright Gautam Malik 2007C
THANK YOU