New High Quality Diesel Injector 211-3026 10R-9787 211-3028 10R-7228 235-1403 253-0597 For CAT C18

Determine the optimal injection pressure range
Through engine bench tests, the engine performance indicators, including power, torque, fuel consumption rate, emissions, etc., are tested under different working conditions (such as different speeds and loads) to determine the relationship between injection pressure and engine performance. Generally speaking, as the injection pressure increases, the fuel atomization effect improves, the combustion is more complete, the engine power and torque will increase, and the fuel consumption rate will decrease. However, when the injection pressure exceeds a certain value, the benefits may gradually decrease, and other problems may also arise, such as increased wear of the injector and increased nitrogen oxide emissions. Therefore, it is necessary to find an optimal injection pressure range so that the engine can achieve a better balance between various performance indicators.

Optimize the injector structure
Adopt a high-pressure common rail system: The high-pressure common rail system can store fuel in the high-pressure oil pipe, so that the injector can obtain a stable high-pressure fuel supply under different working conditions, which helps to achieve higher injection pressure and more precise injection control.
Improve the design of the injector nozzle: optimize the parameters such as the diameter, length, number and angle of the injector nozzle. Smaller nozzle diameter can produce higher injection speed at the same injection pressure and promote fuel atomization, but too small nozzle may cause insufficient fuel flow and clogging problems; appropriate nozzle length can ensure that the fuel forms a stable flow in the nozzle and reduce energy loss; increasing the number of nozzles can make the fuel distribution more uniform and improve combustion efficiency; reasonable design of nozzle angle can make the fuel injection direction better match the shape of the combustion chamber and the airflow movement, and promote the mixing of fuel and air.

Adjust injection strategy
Use multiple injections: As mentioned above, a fuel injection cycle is divided into multiple stages such as pre-injection, main injection and post-injection. Pre-injection can reduce the ignition delay period of the main injection and make the combustion more stable; the main injection stage accurately controls the injection amount and injection rate according to the engine working conditions to meet the requirements of power output and fuel economy; post-injection helps to promote the oxidation of unburned fuel and particulate matter and reduce emissions. By reasonably combining the parameters of multiple injections and matching the appropriate injection pressure, the combustion process of the engine can be optimized and the performance can be improved.
Optimize injection timing: Accurately control the injection time so that the injection timing of the fuel in the cylinder matches the piston movement, intake and exhaust processes, etc. For example, fuel injection at the end of the intake stroke or the beginning of the compression stroke can use the disturbance of the intake airflow to promote the mixing of fuel and air; and the main injection near the top dead center can make the fuel ignite and burn at the best time, improve the combustion efficiency and thermal efficiency, and give full play to the effect of injection pressure optimization.

Matching with other engine parameters
Matching with the intake system: After increasing the injection pressure, the fuel atomization and combustion speed are accelerated. It is necessary to optimize the intake system accordingly, increase the intake volume and intake vortex intensity to ensure that the fuel and air can be fully mixed. For example, optimize the intake duct design, use turbocharging or mechanical supercharging technology, etc., to increase the intake pressure and flow, so that the engine can achieve a more ideal air-fuel ratio under high injection pressure, improve combustion efficiency and power output.
Matching with the shape of the combustion chamber: Different combustion chamber shapes have different requirements for fuel injection. For example, a bowl-shaped combustion chamber is suitable for concentrated injection, while a shallow basin-shaped combustion chamber requires more dispersed injection. Therefore, according to the specific shape and structural characteristics of the combustion chamber, the injection angle and nozzle layout of the injector should be adjusted so that the high-pressure injected fuel can be reasonably distributed in the combustion chamber, fully mixed with the air and burned quickly, thus improving the performance of the engine.

Accurate control through electronic control system
Use advanced electronic control unit (ECU) to accurately calculate and control the injection pressure, injection time and injection amount of the injector according to the real-time working conditions of the engine (such as speed, load, water temperature, intake pressure and other sensor signals). ECU can automatically adjust the injection parameters according to different driving conditions and driver needs, so that the engine can maintain the best performance state under various working conditions. In addition, the electronic control system can also realize the fault diagnosis and adaptive adjustment function of the injector, timely discover and solve problems such as abnormal injection pressure, and ensure the reliability and stability of the engine.

Consider fuel characteristics
Different fuels have different physical and chemical properties, such as viscosity, density, flash point, etc. These characteristics will affect the flow and injection effect of the fuel in the injector. When optimizing the injection pressure, the characteristics of the fuel used need to be considered. For fuels with higher viscosity, the injection pressure may need to be appropriately increased to ensure a good atomization effect; while for fuels with low viscosity, excessive atomization or uneven injection due to excessive injection pressure should be prevented. In addition, the quality and cleanliness of the fuel will also affect the performance of the injector. Clean and standard fuel should be used to avoid injector blockage or wear and ensure the stability and accuracy of the injection pressure.