Download Electronic Fuel Injection System Pdf

This real component trainer provides the instructor with a working multi-point fuel injection system for group or whole-class demonstration.This includes all the individual components of the system presented on a moveable, steel-frame panel with each component clearly identified.The system comprises all the elements that control the air-fuel ratio and the ignition timing, together with the ECU and all the sensors associated with the control system. Variation of the engine speed will allow the measurement of parameters within the system that are speed dependent. This is achieved by changing the rotational speed of the electric motor that drives the unit.This is a dry-running system that uses electronic indicators to demonstrate injector operation. The system also includes a range of switchable faults for diagnostics training.The trainer offers the following practical demonstrations:.

Engine management system fundamentals. The electronic control unit (ECU).

Sensor circuits and components. Sensor circuits and components – fault diagnosis. Actuator circuits and components. Actuator circuits and components – fault diagnosis. Intake air temperature control systems. Self diagnosis & fault codesMore Info.

Electronic Fuel Injection SystemAs we have discussed the, in the modern engines, In which the fuel injection system uses the sensors, a computer and a solenoid operated fuel injector to meter and inject the right amount of fuel into the engine cylinder called the Electronic Fuel Injection system (EFI). These systems use the electrical and electronic systems to monitor and control the engine operations.Usually, in every modern engine, there is this ECU (Electronic control unit). This unit will operate all the devices such as the injectors, ignition system and the other engine related devices.

With the help of received electrical signals in the form of a current or voltage from the various sensors.This results in the better performance of the engine by operating every device at the correct timing and in a perfect sequential manner.So what kind of sensors need to be involved in the engine? So here we go the list of sensors that we need in a modern engine to use the Electronic fuel injection system with the ECU. Exhaust gas or Oxygen sensor. Engine Temperature sensor. Airflow sensor. Air inlet temperature sensor. Throttle position sensor.

manifold sensor. Crankshaft position sensor.

Knock sensorOperation of an Electronic Fuel Injection SystemThe fuel injector in the Electronic fuel injection system is nothing but a fuel valve. This valve will be operated with the computerized signal to actuate by means of the magnetic force by an injector armature.

By this way, the fuel valve will be open and closes.The pulse width in the signal will represent the period for the injector to keep open. This period (Pulse width) will be controlled by the computer based on the signals received from the various sensors listed above.During the full load conditions on the engine, the computer will sense that the wide opening of the throttle, high intake manifold pressure and the high inlet airflow. With this sensing information from the sensor, the ECU will increase the injector opening (Pulse width) to enrich the mixture to enable the engine to produce high power.During or low speed or cruising, the ECU will shorten the pulse to make the mixture leaner to make the engine fuel economy.When the engine is cold, it’s hard to start the engine. The electronic fuel injection system has a cold start injector too. It is an extra injector that sprays fuel into the centre of the engine intake manifold to start the engine easily. It is the same purpose as the carburettor choke.

Fuel Injector Working Pdf

This helps the engine to start up in very cold weather.