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An Electronic Fuel Injection Control System

An Electronic Fuel Injection Control System

  • Thursday, 23 December 2021
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An Electronic Fuel Injection Control System

An electronic fuel injection control system (EFICS) is a computerized control system for an internal combustion engine. It is designed to determine when to open the fuel injection valve and how much fuel to inject into the cylinder. This control system helps keep the engine from stalling and allows the driver to continue driving the vehicle while it is undergoing repairs. It also prevents the vehicle from stalling completely, which is a good thing when driving on a busy road.

The ECU measures and estimates the actions of the sensors to regulate the air/fuel ratio of the mixture during engine starting. The EFICS also has a control logic to enable the fuel injector to be fired at the proper time in the engine. The EFICS has several timing restrictions that are set by the internal combustion engine. The EFICS is therefore designed to follow these constraints and respond in time. If this EFICS fails, the car's engine is forced to shut off immediately and the system automatically kicks in a backup control system.

A feature of the electronic fuel injection control system is a circuit that applies a correction to the actuating pulse of each injector. This correction is necessary to ensure that the engine is operating properly. Typically, the device must respond in a relatively short timeframe in order to make the desired changes. The time constant of the capacitor, the impedance of the coil, and the voltage supplied by the battery are incidental system variables.

In the example above, the ECU will measure the output of the normal sensor and feed that signal to the drive circuit to vary the time of fuel injection. The output of the second comparator 15 is adjusted to correspond to the input of the first comparator 7. A constant voltage is required for the system to function during startup and after the car starts. When the engine is running, a low-voltage version of the EFIS will prevent overheating.

A time delay switching circuit 130 is connected to the ignition. The circuit augments the pulse width when the engine is hot. When the engine is hot, the signal is shorter. The EFIS must therefore be able to detect the start switch signal in order to prevent a catastrophic failure. The electrical components of the system are known as the arithmetic amplifier. The other main components of the EFICS are the controller's output terminals.

FIG. 9 shows the internal arrangement of the ECU 5. The fuel supply control section is operative at the start of the engine. The up counter 505 is connected to the input of the synchronous Ti(S) value calculating circuit. Inputs of the up counter are connected to an AND circuit 503. Then, the outputs of the first integrator and comparator are synchronized to the output terminal 10. The second comparator and the inverter 50 are connected to the inputs of the second comparator 15 and the output of the up counter.

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