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

Bai, Yun; Lan, Qi; Fan, Liyun; Liu, Hong

doi:10.1177/1468087419856981

Cited by 21 publications

(14 citation statements)

References 36 publications

(38 reference statements)

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“…For years, lots of efforts have been made to decrease the level of exhaust gas emissions and to enhance the performance of direct injection diesel engines. To achieve this goal, different approaches have been applied such as using alternative fuels )alcoholic, 6,7 biofuels, 8 gaseous 9–11 ), using fuel additives, 12,13 increasing the direct fuel injection pressure, 14,15 changing the nozzle geometry configuration, 16,17 exhaust gas recirculation (EGR), 18,19 varying injection rate and timing, 20–22 pilot-injection, 23,24 post-injection, 25,26 and multiple injection strategies. 27,28 Besides these strategies, various combustion technologies, such as homogenous charge compression ignition, 29 part premixed charge compression ignition, 30 and premixed charge compression ignition, 31 have been proposed and widely investigated to achieve better fuel economy and lower emissions in compression ignition engines.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the impacts of combustion chamber bowl geometry and injection timing on a reactivity controlled compression ignition engine at low and high load conditions

Jafari

Seddiq

Mirsalim

2020

International Journal of Engine Research

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The present paper aims to assess the impacts of diesel injection timing and two bowl geometries including re-entrant and wide-shallow combustion chambers on the combustion characteristics, emissions formation, and fuel consumption in a reactivity controlled compression ignition diesel engine under low and high load (five and nine bar indicating mean effective pressure) conditions. The results revealed that diesel injection at −60 CA ATDC under low load conditions significantly decreased soot and NOx emissions simultaneously for both piston bowl geometries. The use of the wide-shallow chamber decreased the period of the ignition delay and increased the engine operable load range as a result of more stable combustion under high-load conditions compared to the re-entrant chamber. Moreover, at all diesel injection timings, the indicated specific fuel consumption was decreased by nearly 4.8 and 6.6% under low and high load conditions, respectively when the wide-shallow combustion chamber was used since the heat transfer loss was lower than that of the re-entrant chamber. However, NOx emission under high load conditions at the center of the combustion chamber and more soot emission in the exhaust gas are two disadvantages of the wide-shallow chamber versus the re-entrant combustion chamber.

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Section: Introductionmentioning

confidence: 99%

Assessment of the impacts of combustion chamber bowl geometry and injection timing on a reactivity controlled compression ignition engine at low and high load conditions

Jafari

Seddiq

Mirsalim

2020

International Journal of Engine Research

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“…Determining discard state is done through a forget gate which reads h tÀ1 and x t and outputs a number between 0 and 1 to each of the numbers in C tÀ1 . 0 for complete discard and 1 for complete retention, the expression of which is given in equation (1).…”

Section: Simulation Modeling Of High Pressure Common Rail Systemmentioning

confidence: 99%

“…Small changes in parameters such as injection pressure curve, opening delay time, closing delay time, injection duration and injection quantity can have a huge impact on the combustion response in the combustion chamber and affect the performance of the diesel engine. 1 Therefore, real-time monitoring of the relevant parameters of the injection performance is of great significance to grasp the operational status of the diesel engine. When high pressure common rail system tests were carried out on the test rig, the injector injection pressure curve, injection quantity and other parameters can be obtained by means of pressure sensors and other equipment, which are used to adjust the relevant parameters of the high pressure common rail system and monitor the performance of the common rail system in real time.…”

Section: Introductionmentioning

confidence: 99%

Study on observation method of injection pressure curve in high pressure common rail system

2022

International Journal of Engine Research

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The performance of the diesel engine was determined by the injection pressure of the high pressure common rail system. The observation method of the injection pressure curve was of great value in evaluating the operating conditions of the diesel engine. However, the observation method could make it impossible to directly observe the injection pressure data on a high pressure common rail system in operation. In this paper, common rail pressure signals and control pulse widths, which were easy to collect, were used as the basis for proposing a GRU (Gated Recurrent Unit) based model for the observation of injection pressure curves of high pressure common rail system in order to solve the above problem. The accuracy and precision of the model was verified by the experiments and compared with commonly used simulation models. From the results, it was concluded that the overall accuracy of the injection pressure curve observation was similar to that of the simulation model, but the accuracy was higher around the peak of the injection pressure, as well as the equipment requirement was low and the calculation speed was fast. The mean EMD of the curvilinear observation model of injection pressure of high pressure common rail system is similar to that of the 1D simulation model, with 37.88 and 33.62 respectively. The overall difference in injection pressure between the two models is similar with 53.62 and 54.23 MPa respectively. On the same computing platform, the average computation time of the test set containing five states is 0.0113 s, and the simulation time of each running state is 12951.6 s using AMESim software.

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“…At present, there is relatively little research around the injection stability. Bai et al [13][14][15] have studied the injection stability. The main parameter they pay attention to is the cycle injection quantity.…”

Section: Introductionmentioning

confidence: 99%

Experiment investigation of injection parameters effects on injection stability of a high pressure common rail system

Gao

et al. 2021

Science Progress

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High pressure common rail system can precisely control the injection time and injection pressure to improve the thermal efficiency of the engine. The injection characteristics of the system can affect the combustion and emission process of the engine. Injection stability is defined as variation characteristics of injection. This could have an unignored influence on combustion and engine output, while few study has been published. The primary objective is to establish evaluation systems and methods for injection stability. Then to study injection stability of the high pressure common rail system. Firstly, several parameters that have an important influence on the emission and combustion are identified. Based on the characteristics data obtained, it is verified that the stability parameters are in accordance with the normal distribution. Then, the five characteristic stability parameters of close speed of injection, cycle injection mass, injection delay, maximum injection rate and open speed of injection were quantitatively analyzed by using range, relative range, kurtosis and variance. It is found that the close speed of injection is greatly depend on injection pressure, the range of close speed varies from 1.8 to 5.1 mg/ms when rail pressure varies from 60 MPa to 160 MPa at 0.6 ms energizing time. The stability of injection mass depends on energizing time, the relative range in short energizing time can be four times than long energizing time. The maximum injection rate has similar characteristics with injection mass, it is also depends on energizing time. The range of maximum injection rate is reduced from the average of 0.6–0.7 mg/ms to 0.3 or even 0.2 mg/ms with the increase of energizing time. The injection delay and open speed of injection seems to be greatly affected by pressure fluctuation, since the observed data present complex rules. Pressure fluctuation in common rail can affect injection stability a lot.

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

Cited by 21 publications

References 36 publications

Assessment of the impacts of combustion chamber bowl geometry and injection timing on a reactivity controlled compression ignition engine at low and high load conditions

Assessment of the impacts of combustion chamber bowl geometry and injection timing on a reactivity controlled compression ignition engine at low and high load conditions

Study on observation method of injection pressure curve in high pressure common rail system

Experiment investigation of injection parameters effects on injection stability of a high pressure common rail system

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