PRODUCTS
Fuel Injection Control System
Fuel Injection Control System
The fuel injection control system is responsible for regulating the amount of fuel that the engine receives. It samples the output of the accelerator position sensor 38 and the crank angle sensor 34 to determine the required load for the engine and the speed at which the engine is operating. It then calculates the target amount and pressure of fuel to be injected. The entire process must be performed within a safe operating range and without interruption. Then, the controller varies the parameters and starts the process again.
This process is repeated until the engine fails to respond to the fuel mixture. The microcomputer 21 monitors the current flowing from the first discharge control valve 6 to the second discharge control valve 17. The computer then decides to increase or decrease the amount of fuel delivered. This is called the feedback control. If the sensor is not functioning properly, the "Check Engine" Light will illuminate. However, if all the sensors are functioning, the engine will not display the "Service Engine Soon" Light.
The fuel injection control system controls the amount of fuel the engine receives. If the fuel injectors are not delivering the proper amount of fuel, the controller may adjust the mode of feedback control. This will change the amount of fuel that the engine receives. If the engine is not producing the proper quantity of gas, it may cause the controller to turn off the injectors. This will improve the engine's efficiency. The controller will also perform a diagnosis function. It is the best way to ensure that all of the components of the fuel injection control system are working properly.
In one embodiment, the fuel injection control system monitors the pressure in the common rail 10 and outputs on-signals to the fuel injectors that are not working correctly. Hence, the engine can continue to run even when the ignition coil is not energized. A fifth embodiment changes the fail-safe mode to prevent this. In this embodiment, a failure to open the injectors causes a reset. The next step in the fuel injection control system is to diagnose the failure.
If the system determines that the fuel injectors are not working properly, it can switch the mode of feedback control. In this case, the microcomputer 21 monitors the amount of current flowing between the switches SW1 and SW6 and outputs on-signals to open the first group of fuel injectors. Then, the system continues the procedure to control the flow of fuel. A malfunctioning fuel injector will cause a warning light to illuminate on the dashboard.
The fuel injection control system can be adjusted to respond to sudden changes in the throttle position. The electronic control unit controls the fuel injection volume according to the base time period. If the engine throttle position is changed abruptly, the fuel injection time period is adjusted. If it isn't, the process switches to step (S30) and executes the injection as required. When the ignition switch is closed, the process will begin afresh.
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