Electronic Fuel Injection in Internal Combustion Engines
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This presentation was prepared by Mechanical Engineers during their final year in their Internal Combustion Engine program offered at University of Engineering and Technology Lahore.
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Electronic Fuel Injection in Internal Combustion Engines
- 2. Group Members • 2014-ME-301 • 2014-ME-320 • 2014-ME-331 • 2014-ME-349
- 3. Electronic Fuel Injector Electronic Fuel Injection uses various engine sensors and control module to regulate the opening and closing of injector valve. It consists of • Sensor system • Fuel delivery system • Air induction system • Computer control system
- 4. Advantages • Increased power and torque • Improved volumetric efficiency • More uniform fuel distribution • More rapid engine response • Precise control of the equivalence ratio • Better working in cold-start and engine warm-up.
- 5. Working
- 6. • Electrical Fuel Pump • Pressure Regulator • Fuel Injector • Injector Pulse Width Fuel Delivery system
- 7. Multi port injection System One injector is located in each manifold runner .ECU controls injectors by pulsing their current .Injectors spray fuel directly into intake port in front of intake valve . It has two types
- 8. Types • Speed – density system • Mass air flow
- 9. Throttle body injection System Also called central body injection system has single injector mounted in throttle body .Fuel is sprayed into intake air entering the manifold .Fuel pressure is maintained at constant pressure .
- 11. FEEDBACK SYSTEMS The engine operating air/fuel ratio is maintained close to stoichiometric through the use of sensor called oxygen/lambda sensor .
Editor's Notes
- Definition Consists Types Animation
- System has Fuel tank to store fuel ,the fuel pump to circulate fuel and to provide pressure ,a fuel fuel filter to filter the fuel .Fuel rail or pipe to supply injectors fuel .Injectors suprat fuel into intake valve port .Pressure regulator to control pressure of the system . Fuel supply depends in load ,temperature and speed . different sensor measure the requirements and send signals to ECU which control injector . like In cold start ECU provide pulsating supply of fuel .
- Electrical Fuel Pump draws fuel from tank and forces it into the regulator. Pressure Regulator controls the amount of pressure that enters the injector and any extra fuel is returned to the fuel tank. Fuel Injector is simply a coil or solenoid operated valve Spring pressure holds the injector closed When engaged, the injector sprays fuel into the engine. Injector pulse width is used to control fuel injection through injector . Fuel Preesure is kept at a constant value above manifold pressure so amount of fuel can be determined by time injector is opened by ECU .
- This arrangement is called mulipoint injection system .one injector is located in each manifold runner .ECU controls injectors by controlling pulsing their current .Injectors spray fuel directly into intake port infront of intake valve .Fuel Preesure is kept at a constant value above manifold pressure so amount of fuel can be determined by time injector is opened by ECU . Fuel supply depends in load ,temperature and speed . different sensor measure the requirements and send signals to ECU which control injector . like In cold start ECU provide pulsating supply of fuel .
- speed-density system, where engine speed and manifold pressure and air temperature are used to calculate the engine flow. air-flow meter to measure air flow directly. The air-flow meter is placed upstream of the throttle. The meter shown measures the force exerted on a plate as it !s displaced by the flowing air stream; it provides a voltage proportional to the air flow rate.
- Throttle body injection system . also called central body injection system has single injector .mounted in carburetor like throttle body .fuel is sprayed into intake air entering the manifold .Fuel pressure is maintained at constant pressure .
- The engine operating air/fuel ratio is maintained close to stoichiometric through the use of a sensor in the exhaust system which provides voltage signal dependent on the oxygen concentration in the exhaust gas stream The sensor called an oxygen sensor or lambda sensor The eleclrolyte is yttria (Y203)-stabilized zirconia (Zr02) ceramic which separates two gas chambers (the ex'haust manifold and the atmosphere) which have differentoxygen partial pressures. The oxygen partial pressure in equilibrated exhaust gases decreases by many orders. ofmagnitude as [be equivalence ratio changes from 0.99 to 1.01,