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Pressure rise delay characteristics of a high speed di diesel engine with high pressure injection

01 Jan 1993-
TL;DR: In this paper, the influence of high pressure injection on ignition and pressure rise delay is examined for both the injection system and a single cylinder Hydra research diesel engine fitted with a pump-pipe-nozzle (PPN) system and an EUI injector.
Abstract: Cylinder pressure, injection line pressure and needle lift signals were acquired over a wide range of operating conditions from a Ford York DI diesel engine and a single cylinder Hydra research diesel engine fitted with a pump-pipe-nozzle (PPN) system and a high pressure electronic unit injector (EUI) respectively. The signals were analysed for pressure rise delay (PRD). Ignition delay and PRD data was also obtained from a photographic build of the Hydra via laser illuminated high speed cine photography with a synchronised data acquisition. Illumination delays from visual analysis of the film records are compared with pressure rise delays. Pressure rise delay data is presented for both the injection systems. The influence of high pressure injection on ignition and pressure rise delays is examined. For the covering abstract see IRRD 873243.
Citations
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Journal ArticleDOI
01 Oct 1996
TL;DR: In this paper, Wigner-Ville distribution (WVD) analysis of nonstationary vibration signals monitored on the injector body is used to locate regions of vibration in the time-frequency plane which are responsive to injection parameters.
Abstract: Part 2 of this paper presents the experimental and analytical procedures used in the estimation of injection parameters from monitored vibration. The mechanical and flow‐induced sources of vibration in a fuel injector are detailed and the features of the resulting vibration response of the injector body are discussed. Experimental engine test and data acquisition procedures are described, and the use of an out‐of‐the‐engine test facility to confirm injection dependent vibration response is outlined. Wigner‐Ville distribution (WVD) analysis of non‐stationary vibration signals monitored on the injector body is used to locate regions of vibration in the time‐frequency plane which are responsive to injection parameters. From the data in these regions, estimates of injection timing and fuel pressure are obtained. Accurate estimation of injection parameters from externally monitored vibration is shown to pave the way for the detection and diagnosis of injection system faults. Moreover, it is demonstrated that the technique provides an alternative method for the set‐up, checking and adjustment of fuel injection timing. Table 1 caption: Test engine specification Fig. 1 caption: Injector vibration versus cylinder pressure, line pressure and needle lift Fig. 2 caption: Bench‐top test rig layout and data acquisition system Fig. 3 caption: Injector vibration and needle motion from bench‐top testing Fig. 4 caption: Engine test layout and data acquisition system Fig. 5 caption: Time‐frequency analysis of injector vibration Fig. 6 caption: Time‐frequency analysis of injector vibration at 3000 r/min Fig. 7 caption: Timing of the fuel injection process Fig. 8 caption: Comparison of needle lift and vibration derived injection timing Fig. 9 caption: Comparison between injection line pressure and injector vibration Fig. 10 caption: Relationship between injector vibrtation and line pressure

24 citations

Journal ArticleDOI
01 Oct 1996
TL;DR: In this article, a detailed dynamic model for the needle motion of a common hole-type diesel fuel injector as used in a direct injection diesel engine is presented, which is described as a two-mass piece-wise linear vibro-impact system, unlike the conventional modelling techniques which use a single mass approach.
Abstract: Part 1 of this paper presents the development and validation of a detailed dynamic model for the needle motion of a common hole‐type diesel fuel injector as used in a direct injection diesel engine. The injector needle motion is described as a two‐mass piece‐wise linear vibro‐impact system, unlike the conventional modelling techniques which use a single‐mass approach. The use of two masses permits analysis of both the needle impact behaviour and of the more general dynamics of the fuel injection process. Model parameters are derived from a combination of measurement and estimation, and the subsequent model is evaluated via direct measurement of the spring seat displacement. The opening and closing needle impact behaviour is shown to exhibit close correlation with key injection parameters, including fuel injection pressure, fuelling rate and timing. The model revealed that the impact of the needle when opening is found to exhibit lower amplitude but more high‐frequency components than the impact associated with the closing. The measurement of the injector body vibration response to these impacts is shown to enable non‐intrusive estimation of injection parameters, alleviating the problems associated with conventional intrusive needle‐lift measurement. Table 1 caption: Injector specifications Fig. 1 caption: Schematic and dynamic model of an injector valve Fig. 2 caption: Comparison between measurement and predicted needle lift Fig. 3 caption: Injection speed behaviours at a fuelling of 35 mm3/injection Fig. 4 caption: Injection fuel behaviours at a speed of setting 1.0 m/s Fig. 5 caption: Impact/speed correlation at a fuelling of 35 mm3/injection Fig. 6 caption: Time‐frequency analysis of injector impacts Fig. 7 caption: Correlation between fuel injection parameters and impacts Fig. 8 caption: Influence of needle mass on fuel injection

18 citations

References
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Journal ArticleDOI
01 Oct 1996
TL;DR: In this paper, Wigner-Ville distribution (WVD) analysis of nonstationary vibration signals monitored on the injector body is used to locate regions of vibration in the time-frequency plane which are responsive to injection parameters.
Abstract: Part 2 of this paper presents the experimental and analytical procedures used in the estimation of injection parameters from monitored vibration. The mechanical and flow‐induced sources of vibration in a fuel injector are detailed and the features of the resulting vibration response of the injector body are discussed. Experimental engine test and data acquisition procedures are described, and the use of an out‐of‐the‐engine test facility to confirm injection dependent vibration response is outlined. Wigner‐Ville distribution (WVD) analysis of non‐stationary vibration signals monitored on the injector body is used to locate regions of vibration in the time‐frequency plane which are responsive to injection parameters. From the data in these regions, estimates of injection timing and fuel pressure are obtained. Accurate estimation of injection parameters from externally monitored vibration is shown to pave the way for the detection and diagnosis of injection system faults. Moreover, it is demonstrated that the technique provides an alternative method for the set‐up, checking and adjustment of fuel injection timing. Table 1 caption: Test engine specification Fig. 1 caption: Injector vibration versus cylinder pressure, line pressure and needle lift Fig. 2 caption: Bench‐top test rig layout and data acquisition system Fig. 3 caption: Injector vibration and needle motion from bench‐top testing Fig. 4 caption: Engine test layout and data acquisition system Fig. 5 caption: Time‐frequency analysis of injector vibration Fig. 6 caption: Time‐frequency analysis of injector vibration at 3000 r/min Fig. 7 caption: Timing of the fuel injection process Fig. 8 caption: Comparison of needle lift and vibration derived injection timing Fig. 9 caption: Comparison between injection line pressure and injector vibration Fig. 10 caption: Relationship between injector vibrtation and line pressure

24 citations

Journal ArticleDOI
01 Oct 1996
TL;DR: In this article, a detailed dynamic model for the needle motion of a common hole-type diesel fuel injector as used in a direct injection diesel engine is presented, which is described as a two-mass piece-wise linear vibro-impact system, unlike the conventional modelling techniques which use a single mass approach.
Abstract: Part 1 of this paper presents the development and validation of a detailed dynamic model for the needle motion of a common hole‐type diesel fuel injector as used in a direct injection diesel engine. The injector needle motion is described as a two‐mass piece‐wise linear vibro‐impact system, unlike the conventional modelling techniques which use a single‐mass approach. The use of two masses permits analysis of both the needle impact behaviour and of the more general dynamics of the fuel injection process. Model parameters are derived from a combination of measurement and estimation, and the subsequent model is evaluated via direct measurement of the spring seat displacement. The opening and closing needle impact behaviour is shown to exhibit close correlation with key injection parameters, including fuel injection pressure, fuelling rate and timing. The model revealed that the impact of the needle when opening is found to exhibit lower amplitude but more high‐frequency components than the impact associated with the closing. The measurement of the injector body vibration response to these impacts is shown to enable non‐intrusive estimation of injection parameters, alleviating the problems associated with conventional intrusive needle‐lift measurement. Table 1 caption: Injector specifications Fig. 1 caption: Schematic and dynamic model of an injector valve Fig. 2 caption: Comparison between measurement and predicted needle lift Fig. 3 caption: Injection speed behaviours at a fuelling of 35 mm3/injection Fig. 4 caption: Injection fuel behaviours at a speed of setting 1.0 m/s Fig. 5 caption: Impact/speed correlation at a fuelling of 35 mm3/injection Fig. 6 caption: Time‐frequency analysis of injector impacts Fig. 7 caption: Correlation between fuel injection parameters and impacts Fig. 8 caption: Influence of needle mass on fuel injection

18 citations