Investigation on the fuel injection stability of high pressure common rail system for diesel engines

2019 ◽  
pp. 146808741985698 ◽  
Author(s):  
Yun Bai ◽  
Qi Lan ◽  
Liyun Fan ◽  
Xiuzhen Ma ◽  
Hong Liu
Keyword(s):  
High Pressure ◽  
Diesel Engines ◽  
Fuel Injection ◽  
Common Rail ◽  
Common Rail System ◽  
Rail System ◽  
High Pressure Common Rail

scholarly journals Experimental study on the performance of ultra high pressure common rail system

2021 ◽  
Vol 39 (4) ◽  
pp. 883-890
Author(s):  
Kun Yang ◽  
Lei Zhou ◽  
Gang Wang ◽  
Tao Nie ◽  
Xin Wu
Keyword(s):  
High Pressure ◽  
Fuel Injection ◽  
Injection Rate ◽  
Common Rail ◽  
Common Rail System ◽  
Ultra High Pressure ◽  
Rail System ◽  
Pressure Peak ◽  
Fuel Injection Rate ◽  
High Pressure Common Rail

In order to overcome the difficulties of high pressure source design and parts integration in the injector, realizing the ultra high pressure injection and controllable fuel injection rate, an ultra high pressure common rail system based on domestic basic materials and manufacturing technology level was proposed and designed. The working principle of this system was first introduced; the performance test bench of ultra high pressure common rail system was built. Then, the influence of pressure-amplifier device structure parameters on the pressurization pressure peak was analyzed quantitatively, and on the basis of selecting the most appropriate combination of parameters, the pressure and fuel injection rate control characteristics were conducted. The results show that ultra high pressure common rail system can magnify fuel pressure to ultra high pressure state (more than 200 MPa) and by changing the control signal timing of pressure-amplifier device and injector solenoid valve, the flexible and controllable fuel injection rate can be achieved. Under the condition of the same pressurization ratio, the peak value of pressurization pressure increases gradually, and with the increase of pressurization ratio, the increasing trend of the pressurization pressure peak value is nonlinear. At the same time, under the same condition of spring preload, the greater of the spring stiffness, the higher of the rail base pressure can bear, that means the pressure-amplifier device can achieve pressurization at a higher base pressure. But if the spring stiffness is too large, the solenoid valve of pressure-amplifier device will not be opened due to insufficient electromagnetic force, so the specific selection should be considered in a compromise.

Experimental study and optimization in the layouts and the structure of the high-pressure common-rail fuel injection system for a marine diesel engine

2020 ◽  
pp. 146808742092161
Author(s):  
Ying Hu ◽  
Jianguo Yang ◽  
Nao Hu
Keyword(s):  
High Pressure ◽  
Fuel Injection ◽  
Common Rail ◽  
Injection System ◽  
Rail Pressure ◽  
Common Rail System ◽  
Injection Volume ◽  
Rail System ◽  
Marine Diesel ◽  
High Pressure Common Rail

The structure and performance of the common-rail system for the marine diesel engine are different from those used for automobile applications, resulting from the larger accumulator volume and the single injection volume. According to the characteristics of the distributed structure of the accumulator volume, a novel optimisation idea to improve the steady-state performance of the high-pressure common-rail fuel injection system designed for a marine engine retrofitting is proposed. The study concentrates on the optimisation in the hydraulic layouts and the structure parameters to manage the energy stored in the pressure waves. First, the test rig was established to study and evaluate the steady-state performance of the high-pressure common-rail system. Second, the experiments of rail orders and injection sequences were carried out to study the influence of different hydraulic layouts on the energy distribution of pressure waves in the system. Meanwhile, a comprehensive and detailed model of the high-pressure common-rail system was built to investigate the structural parameters of a rail-to-injector pipe. Based on the high-pressure common-rail system model, the modified multi-objective genetic algorithm was employed to seek the trade-off between the consistency of the injection volume and the reduction of the rail pressure fluctuation. Results show that a uniform distribution of multiple rails in one cycle contributed to reducing the amplitude of the rail pressure oscillation. In the parameter ranges of this study, a longer length and larger diameter of the rail-to-injector pipe could reduce the standard deviation of the injection volume and the rail pressure fluctuation rate simultaneously.

scholarly journals A calculation method and experiment study of high-pressure common rail injection rate with solenoid injectors

2021 ◽  
Vol 104 (2) ◽  
pp. 003685042110261
Author(s):  
Ziguang Gao ◽  
Guoxiu Li ◽  
Chunlong Xu ◽  
Hongmeng Li ◽  
Min Wang
Keyword(s):  
High Pressure ◽  
Input Data ◽  
Fuel Injection ◽  
Injection Rate ◽  
Common Rail ◽  
Common Rail System ◽  
Rail System ◽  
Rate Profile ◽  
Fuel Injection Rate ◽  
High Pressure Common Rail

The high-pressure common rail system has been widely used owing to its precise control of fuel injection rate profile, which plays a decisive role in cylinder combustion, atomization, and emission. The fuel injection rate profile of high-pressure common rail system was studied, and a fuel injection rate profile calculation model is proposed. The model treats the injector as a black box. Some measured data are needed to calculate the parameters in the model. The rise and fall of injection rate is regarded as trigonometric function to reduce the complexity and increase the accuracy. The model was verified using two different types of fuel injectors. The model calculation results were evaluated under various data input conditions. The results show that the model has good applicability to different input data and injectors. In addition, because the model building requires a large amount of experimental data, a comprehensive analysis of various input data was also conducted. The injection profile was analyzed from a new perspective and the regularity of injection rate profile was established.

An on-line measurement method of injection rate of high pressure common rail system

Measurement ◽  
2021 ◽  
Vol 170 ◽  
pp. 108716
Author(s):  
Quan Dong ◽  
Xiyu Yang ◽  
Hao Ni ◽  
Jingdong Song ◽  
Changhao Lu ◽  
...  
Keyword(s):  
High Pressure ◽  
Measurement Method ◽  
Injection Rate ◽  
Common Rail ◽  
Common Rail System ◽  
Rail System ◽  
Line Measurement ◽  
On Line ◽  
High Pressure Common Rail

scholarly journals A Study on the Injection Characteristics of Swirl Nozzle Injector in Common-rail System for High Pressure Fuel Injection

2013 ◽  
Vol 21 (4) ◽  
pp. 89-95
Author(s):  
Yunsub Sin ◽  
Geesoo Lee ◽  
Hyunchul Kim ◽  
Sangshin Kwak ◽  
Suk Shin Shin ◽  
...  
Keyword(s):  
High Pressure ◽  
Fuel Injection ◽  
Common Rail ◽  
Common Rail System ◽  
Rail System

scholarly journals Establishment of a Real-Time Simulation of a Marine High-Pressure Common Rail System

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5481
Author(s):  
Qinpeng Wang ◽  
Heming Yao ◽  
Yonghua Yu ◽  
Jianguo Yang ◽  
Yuhai He
Keyword(s):  
High Pressure ◽  
Real Time ◽  
Common Rail ◽  
Rail Pressure ◽  
Common Rail System ◽  
Real Time Simulation ◽  
The Real ◽  
Rail System ◽  
Time Simulation ◽  
High Pressure Common Rail

In this paper, the high-pressure common rail system of the marine diesel engine is taken as case study to establish a real-time simulation model of the high-pressure common rail system that can be used as the controlled object of the control system. On the premise of ensuring accuracy, the real-time simulation should also respond quickly to instructions issued by the control system. The development of the real-time simulation is based on the modular modeling method, and the high-pressure common rail system is divided into submodels, including the high-pressure oil pump, common rail tube, injector, and mass conversion. The submodels are built using the “surrogate model” method, which is mainly composed of MAP data and empirical formulas. The data used to establish the real-time simulation are not only from the empirical research into the high-pressure common rail system, but also from simulations of the high-pressure common rail system undertaken in AEMSim. The data obtained from this real-time simulation were compared with the experimental data to verify the model. The error in fuel injection quality is less than 5%, under different pressures and injection durations. In order to carry out dynamic verification, the PID control strategy, the model-based control strategy, and the established real-time simulation are all closed-loop tested. The results show that the developed real-time simulation can simulate the rail pressure wave caused by cyclic injection according to the control signal, and can feedback the control effect of different control strategies. Through verification, it is clear that the real-time simulation of the high-pressure common rail system can depict the rail pressure fluctuation caused by each cycle of fuel injection, while ensuring the accuracy and responsiveness of the simulation, which provides the ideal conditions for the study of a rail pressure control strategy.

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