Electrically Controlled Diesel Genset VS EFI Diesel Genset

Jan. 12, 2022

What are the differences between electrically controlled diesel generator set and EFI diesel generator?


In terms of speed regulation mode of diesel genset, EFI engine and electric regulator belong to the category of electronic speed regulation. They are different from mechanical speed regulation control mode, which can be compared from the following aspects:


First, fuel injection pressure.

The electric regulator directly injects diesel into the cylinder through the traditional high-pressure pump, and its injection pressure is limited by the pressure valve on the injector. After the fuel pressure in the high-pressure oil pipe reaches the set value of the pressure valve, it directly rushes open the valve and injects it into the cylinder. Affected by mechanical manufacturing, the pressure of the pressure valve cannot be very large.


Diesel engine generator


The EFI engine first generates high-pressure oil in the high-pressure oil chamber of the fuel injector by the high-pressure oil pump. The fuel injection of the fuel injector is controlled by the solenoid valve. When fuel injection is required, the electronic control system controls the solenoid valve to open and inject the high-pressure oil into the cylinder. The pressure of the high-pressure oil is not affected by the pressure valve and can be greatly increased. The diesel injection pressure is increased from 100MPa to 180MPa. Such a high injection pressure can significantly improve the mixing quality of diesel and air, shorten the ignition delay period, make the combustion faster and more thorough, and control the combustion temperature, so as to reduce the exhaust emission.


Second, independent injection pressure control.

The injection pressure of the oil supply system of the high-pressure oil pump of the electric regulating engine is related to the speed and load of the diesel engine, which is unfavorable to the fuel economy and emission under the conditions of low speed and partial load.


The fuel supply system of EFI engine has the ability to control the injection pressure independent of speed and load. It can select the appropriate injection pressure to improve the injection duration and ignition delay period, and make the exhaust emission of diesel engine low and economical under various working conditions.


Third, independent fuel injection timing control.

The high-pressure pump of the electric regulator is driven by the camshaft of the engine, and its injection timing directly depends on the rotation angle of the camshaft. After a machine is adjusted, its injection timing has been fixed.


The injection timing of the EFI machine is completely adjusted by the solenoid valve controlled by the electronic control system. The ability of injection timing control independent of machine rotation is the key measure to achieve a good balance between fuel consumption and emission.


Fourth, fast oil cut-off capacity.

The fuel must be cut off quickly at the end of injection. If the fuel cannot be cut off quickly, the diesel injected under low pressure will emit black smoke due to insufficient combustion and increase HC emission.

The high-speed electromagnetic on-off valve used in the injector of EFI diesel engine is easy to realize rapid fuel cut-off, but the high-pressure oil pump of electric regulator can not do this.


Fifth, the implementation mode of speed control.

The electrically regulated diesel generator set is a governor that feeds back the speed signal of the machine through the speed sensor. The governor converts the difference into the speed regulation signal by comparing the preset speed value and drives the actuator to control the oil supply rack or sliding sleeve to realize speed regulation. The oil supply signal simply depends on the speed signal, and the adjustment of oil supply is realized by the mechanical action of the actuator.


The EFI machine uses sensors such as speed, injection time, intake air temperature, intake air pressure, fuel temperature and cooling water temperature to input the parameters detected in real time into the computer (ECU) at the same time, compare them with the stored set parameter values or parameter maps (map), and send the instructions to the actuator (solenoid valve) according to the good value or calculated target value after processing and calculation.

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