Research on transmission and coupling characteristics of multi-frequency pressure fluctuation of high pressure common rail fuel system

Wei, Yunpeng; Fan, Liyun; Wu, Yuelin; Gu, Yuanqi; Xu, Jing; Fei, Hongzi

doi:10.1016/j.fuel.2021.122632

Cited by 12 publications

(2 citation statements)

References 30 publications

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“…After the low‐pressure fuel is pumped out by the oil supply module, it becomes unstable high‐pressure fuel which enters the accumulator module and finally enters the fuel injection module. Wei et al 14 established a prediction model of the HPCRS and analyzed the influence of different hydraulic components such as pumps, rails, and injectors on pressure fluctuations by employing hydraulic decoupling method. The pressure fluctuations are mainly induced by the coupling of high and low frequency pressure waves.…”

Section: Introductionmentioning

confidence: 99%

Research on fuel injection characteristics of common rail system based on high pressure pipeline integration and matching

Xu,

Ma,

et al. 2024

Energy Science & Engineering

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The modular prediction model of high pressure common rail system was established to study the influence of high‐pressure pipeline integration matching on the fuel injection characteristics of common rail system. The influence of common rail volume on pressure building and pressure fluctuation in common rail tubes was analyzed. The influence of common rail volume on the matching of fuel injection frequency (number of fuel injectors) and fuel supply frequency (number of plunger pumps) was studied by using the control variable method, and the basic optimal solution of the system was obtained. The influence of the common rail structure on the fuel flow characteristics of the system was also studied. The matching relationship between high pressure tubing and common rail system is studied by introducing dimensionless numbers such as length‐diameter ratio of pipeline. The results demonstrate that the increase of the storage space of the accumulator can effectively reduce the fluctuation in the system, so that the injection volume increases slowly and then decreases rapidly, with a slope of −5.70 × 10−3 mm3. The increase of the diameter of the common rail makes the fuel flow characteristics become good first and then bad, and the increase of the length of the common rail can soothe the pressure fluctuations. The increase of the diameter of the link tube (LT) makes the fuel injection volume of the injector increase first and then decrease. The optimal VR solution for the LT is 0.0249 and the optimal ratio of the length to diameter of a pipeline solution is 55.10. The structure of the distribution tube and its matching to the common rail have little effect on the fuel flow characteristics. When the diameter and length of the injection tube are too large, the influence on the injection pressure of the injector is negatively correlated.

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Section: Introductionmentioning

confidence: 99%

Research on fuel injection characteristics of common rail system based on high pressure pipeline integration and matching

Xu,

Ma,

et al. 2024

Energy Science & Engineering

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“…The result shows that the injection pressure peak is caused by the rapid fuel pressure rising. Wei et al 13 analyzed the coupling characteristics of fuel supply and injection in HPCRS. The results show that the pressure fluctuation of the system is mainly caused by the coupling of high and low frequency pressure waves.…”

Section: Introductionmentioning

confidence: 99%

Research on pressure wave decoupling method for the nozzle of common rail electronically controlled injector based on water hammer theory

Xu,

Fan,

et al. 2024

International Journal of Engine Research

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The pressure fluctuation in nozzle of the common rail injector directly affects the stability of fuel injection. As the pressure fluctuation often the result of coaction of multiple factors, it is difficult to carry out in-depth research. To reveal the mechanism of pressure fluctuation of common rail injector nozzle, based on the verified AMESim simulation model of the injector, the decoupling method of pressure wave in delivery chamber of the injector was investigated by applying the water hammer theory. The water hammer pressure in delivery chamber was divided into four stages, and pressure waves caused by the needle valve opening can be decoupled from that caused by the needle valve closing. In the range of 80–180 MPa rail pressure, both the opening and closing processes of the needle valve are direct water hammer phenomena. It is found that the water hammer pressure of the delivery chamber caused by fuel injection mainly consists of three pressure waves through a series of analysis and simplification. The results show that, all the pressures obtained by the superposition of three pressure waves under different working conditions are in good agreement with the simulated water hammer pressures.

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Experimental study on the transient supply consistency for a common rail pump based on impedance theory

Gu,

Fan,

Lan

et al. 2023

Energy

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Research on transmission and coupling characteristics of multi-frequency pressure fluctuation of high pressure common rail fuel system

Cited by 12 publications

References 30 publications

Research on fuel injection characteristics of common rail system based on high pressure pipeline integration and matching

Research on fuel injection characteristics of common rail system based on high pressure pipeline integration and matching

Research on pressure wave decoupling method for the nozzle of common rail electronically controlled injector based on water hammer theory

Experimental study on the transient supply consistency for a common rail pump based on impedance theory

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