2005 EFI AUTO ELECTRICIAN COURSE AUTO ELECTRICIAN DIPLOMA COURSE KOTLI

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Auto Electrician

Electronic fuel injection (EFI) is simple, in theory. The design goal for an EFI system is to deliver the correct air fuel ratio for varying load, speed and temperature. Most modern EFI systems are incorporated in an ECU which also controls the ignition system, and may control may other functions such as anti-lock brakes, traction control systems, the transmission, etc. A fuel injection system itself consists of a source of pressurized fuel, fuel injectors and the electronic controller. The fuel system is composed of the fuel tank, a high pressure pump, and some method for regulating fuel pressure. The injectors can be though of as electrically operated valves. The amount of fuel delivered to the engine is determined by size of the injectors, the amount of time that the injectors are open, and on the fuel pressure. The electronic controller to determines how much fuel is needed and commands the injectors to remain open for the necessary amount of time to deliver the needed fuel volume. The amount of time that the injector is open is called the pulse width and is usually expressed in milliseconds (one thousands of a second).

A simple EFI system can operate fairly effective with just these three inputs. However, many systems include additional inputs from the following types of sensors. Most sensors are of one of two types. Some are simple on-off switches or counters, such as a gear indicator or tachometer. Most measure continuous variables like temperature or airflow. These sensors produce a 0-5v output. This signal is read by the ECU (computer). By referring to a calibration table, the ECU translates the signal into a value representing the physical parameter which is being measured, such as airflow in units of mass/time or temperature. The tuning process boils down in most cases to changing the values in these tables.

• Mass Air Flow (MAF – a sensor which directly measures airflow into the motor)
• Intake Air Temperature (IAT – an electronic temperature sensor to measure the temperature of the air entering the motor)
• Coolant Temperature Sensor (ACT – an electronic temperature sensor to measure the temperature of the engine coolant)
• Vehicle Speed Sensor (VSS – an electronic speedometer)
• Oxygen sensor (O2 sensor – measures the amount of oxygen in the exhaust which reflects the A:F (air:fuel) ratio)
• Knock sensor (a microphone which picks up the characteristic sound of engine knock)
• Crankshaft position (a magnetic sensor that tells the ECU which cylinder is ready to fire or receive fuel)
• Transmission sensors (these may include gear selection, pressure, and temperature sensors)
• Emission control device operation (a variety of functions may be monitored by different sensors)
• Advanced Throttle Body Fuel injection
• No tuning experience required - System provides self-mapping fuel technology to continually monitor and adjust fuel calibration
• Ready to run right out of the box with pre-loaded calibrations
• Supports fully programmable Ignition Control to optimize performance and fuel economy
• Accepts traditional round air cleaners and maintains same hood clearance as a carb
• Easy to use E Tuner App that communicates via Bluetooth wireless for ECU setup and engine tuning adjustments
• Capable of adapting to limitless engine and camshaft profiles
• Available with or without 7" Android Touch screen device with pre-loaded E Tuner App