A Method for the Estimation of the Service Life of a Precision Guiding Interface “Needle - Nozzle Body” of a Common-Rail-Injector for High Rail Pressures

Лазарев, В. Е.; Wloka, J.; Wachtmeister, Georg

doi:10.4271/2011-01-2020

Cited by 8 publications

(7 citation statements)

References 1 publication

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“…F n in Figure 7(b) represents the applied stress acting on the shoulder of the needle body caused by the tightening torque of the clamping nut. Given an estimated torque 48 of 80 N Á m and area of the shoulder as 64.75 mm 2 , the stress F n is 535.13 MPa. Figure7(c) illustrates the loading on the needle valve.…”

Section: Meanings Of the Parameters Valuementioning

confidence: 99%

“…It should be noted here that, viscous shear force by the fluid in the annular gap between the needle and needle body could be neglected because the clearance is very small. 43,48 Assuming that the fuel pressure in the delivery chamber and sac volume are the same, then:…”

Section: Meanings Of the Parameters Valuementioning

confidence: 99%

“…The reason for this order of magnitude difference still has not been reported. As injection pressures increase, the needle valve assembly experiences elastic deformation, [44][45][46] expanding the clearance of the needle guidance, 47,48 and deforming the moving components (control plunger, needle, and rod) in the axial direction. [49][50][51][52][53] Nevertheless, to the best of authors' knowledge, there is no research conducted on the bending deformation of the needle in the radial direction and the relevance of the clearance gap changing in the upstream with the eccentricity of the needle tip.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An analytical model of diesel injector’s needle valve eccentric motion

Wang

Moro

Jin

et al. 2021

International Journal of Engine Research

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Past experimental studies have shown that the needle valve of high-pressure diesel injectors undergoes lateral movement and deformation, while the continuous increase in injection pressure enlarges the gap of the needle valve assembly. Two different analytical models, considering or omitting this change are presented here, linking the geometries of the needle valve assembly with the magnitude of needle valve tip lateral movement. It is found that the physical dimensions of the needle valve assembly and the injection pressure have a significant impact on the radial displacement of the needle. For example, for nominal clearances between the needle guidance and the needle valve of about 1–3 μm, the magnitude of the radial movement of the needle tip could reach tens of microns. The model that takes into account the variation of the gap between the needle guide and needle valve is found to give predictions closer to the experimental results.

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Section: Meanings Of the Parameters Valuementioning

confidence: 99%

Section: Meanings Of the Parameters Valuementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An analytical model of diesel injector’s needle valve eccentric motion

Wang

Moro

Jin

et al. 2021

International Journal of Engine Research

View full text Add to dashboard Cite

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“…Effective methods implemented in various automated installations, diagnostic devices and testers cannot be applied in practice without preliminary measures to improve suitability of both diagnostic tools and diesel engine and its fuel-delivery systems. Improving the suitability of fueldelivery systems to basic diagnostic tools allows reducing the number of adapter units, to make sensors installation on the object easier and to increase efficiency of diagnostics [20][21][22].…”

Section: Mathematical Modelmentioning

confidence: 99%

Development of a Method for Diagnosing Injectors of Diesel Engines

Gabitov¹,

Negovora²,

Nigmatullin³

et al. 2021

Komunikácie

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The purpose of this study was to improve the diagnostics efficiency of modern diesel engine injectors with electronic controls. Experimental studies, performed using certified specialized equipment of injectors' manufacturers and standard software packages for data analysis, made it possible to prove adequacy of theoretical research and get results that are more accurate. Those results contribute to development of a software product that allows identifying a particular faulty element during the defective injector's operation by using mathematical processing of the diagnostic data obtained when testing the injector. Thus, the time spent to repair the fuel injection system reduces. The developed software product also helps to predict the remaining injector's operational life and prevent possible technical failures during operation.

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“…The development of energy sources in transport engineering, like heat engines and diesel engines is characterized by further improvements in fuel efficiency and a reduction of toxicity in exhaust gases. To decrease the toxicity of exhaust gases, the duration of the fuel injection should be reduced by increasing the fuel pressure and perfection of a nozzle's tribosystems, which is realized in accumulating diesel injection systems, such as CR [1][2][3]. Fuel dispensing in such systems is carried out by means of electro-hydraulic devices placed in the fuel injector.…”

Section: Introductionmentioning

confidence: 99%

Optimum design of nozzles’ tribology systems of a diesel engine fuel injector with high values of rail pressure

Лазарев¹,

Lomakin²,

Lazarev³

et al. 2015

WIT Transactions on Ecology and the Environment

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One of the actual and important problems of modern motor engineering is the improvement of lifetime and ecological parameters with a decreasing of internal combustion engines' (ICE) exhaust gases toxicity. This problem should be solved by means of a detailed focus on the main tribosystem (needle -nozzle's body) of Common Rail (CR) fuel systems of diesel engines. One of the ways which allows one to influence the precision tribocontact's service life, quality of injection and, subsequently, the ecological parameters of diesel engines is the perfection of a nozzle's tribosystem design. The development of a new design of the nozzle, its perfection and experimental estimation of injection parameters with high rail pressures was the main aim and task of the investigation. The main parameters of the fuel injection were estimated with the help of the experimental nozzle under different rail pressures. The experimental nozzle from a hydrauliccontrolled system is used in the CR injector with electro-hydraulic controlling. As a result of the process visualization of fuel injection, the nature of the fuel streams development was established and injection rate characteristics were experimentally determined. The causes of the unstable injection and instability of characteristics under different pressures were determined and recommendations for improving the design of the nozzle with additional precision tribo-interface were presented.

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A Method for the Estimation of the Service Life of a Precision Guiding Interface “Needle - Nozzle Body” of a Common-Rail-Injector for High Rail Pressures

Cited by 8 publications

References 1 publication

An analytical model of diesel injector’s needle valve eccentric motion

An analytical model of diesel injector’s needle valve eccentric motion

Development of a Method for Diagnosing Injectors of Diesel Engines

Optimum design of nozzles’ tribology systems of a diesel engine fuel injector with high values of rail pressure

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