Common Rail Diesel Fuel Injection Control System

Common Rail Diesel Fuel Injection Control System – The control of the common rail diesel fuel injection system (Fuel Injection Control) plays an important role in engine performance because through the control of the engine injection system it will get fuel forces according to engine needs.

Common Rail Diesel Fuel Injection Control System

There are several things that control the fuel in the common rail system, as follows.

Common Rail Diesel Fuel Injection Control System
Common Rail Diesel Fuel Injection Control System.

Fuel Injection Quantity Control

This control system is useful for determining the amount of fuel injected (fuel injection quantity) into the cylinder chamber. The work of this control system is related to additional information on conditions of cooling water temperature (coolant temperature), fuel temperature (fuel temperature), intake air temperature (intake air temperature), and outside air pressure (barometric pressure), Amount of intake air (mass airflow). and several switch inputs as correction information on the basis of determining the amount of fuel injection (basic injection quantity) which is calculated by the Electronic Control Module (ECM) based on engine working conditions (engine speed, number of steps on the accelerator pedal and boost pressure sensor).

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A higher injection rate indicates an increase in engine load, such as when the accelerator pedal is stepped on at constant engine speed and then combined with fuel injection at high-pressure injection, this control system will improve the exhaust gas produced and ensure proper fuel consumption. When compared to conventional mechanical governors, an electronic control system is able to provide a higher level of control over setting the amount of fuel injection, so that the acceleration response will be better (acceleration feeling and pressing feeling).

Injection Quantity Control at Start (Starting Injection Quantity Control)

When the engine is started (after the ignition is turned to the START position to start the engine, until the ignition returns to the ON position), the optimal amount of fuel injection is controlled based on information from “engine speed and coolant temperature”. In low-temperature conditions, the amount of fuel injection will be increased when the engine is running (the ignition is back in the ON position), and the “boosted quantity injection mode” at the start will be canceled by the ECM and will switch to “normal running mode” and the amount of fuel injection will return to match the engine’s needs.

Idle Speed ​​Control

This control system is made to obtain stable idling during idling rotation against changes in engine speed conditions. The electronic control module ECM will set the target idling speed and will control the amount of fuel injection (fuel injection quantity) according to engine conditions (actual engine speed, coolant temperature, and engine load) to follow the actual engine speed (actual engine speed) against the target idling rotation (target idling speed) then ensures the stability of the idling rotation (idle speed).

Idle Vibration Control

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The purpose of the control system design is to minimize the occurrence of engine vibration. The engine vibration comes from the torque that varies between cylinders from one cylinder to another. Meanwhile, engine vibration also comes from the amount of fuel injection per cylinder or varying injector performance (injector performance). The ECM will correct the amount of fuel injected into each cylinder based on the rotation signal from the crankshaft position sensor (CKP). Thus, the system can reduce engine vibration. The normal range for the amount of correction between each cylinder is ± 5 mm.

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