Investigation of Sectional-Stage Loading Strategies on a Two-Stage Turbocharged Heavy-Duty Diesel Engine under Transient Operation with EGR

Liu, Zhongchang; Yuan, Xing; Tian, Jing; Han, Yingbo; Li, Runzhao; Gao, Guanlong

doi:10.3390/en11010069

Cited by 5 publications

(2 citation statements)

References 28 publications

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“…Besides, the increasing rates of smoke and CO are also positive under "slow-fast" loading strategies (e.g., Strategies 1 and 2) and the heavier the CPL, the greater the smoke and CO peak values (the reason is given in the first paragraph under Section 3.1). Moreover, because of the difference in the formation mechanism between NOx and smoke [17][18][19][20][21] its increasing rates in different loading strategies are contrary to those of the smoke emission for NOx emission, but the levels of these increasing rates are small. Besides, the increasing rates of smoke and CO are also positive under "slow-fast" loading strategies (e.g., Strategies 1 and 2) and the heavier the CPL, the greater the smoke and CO peak values (the reason is given in the first paragraph under Section 3.1).…”

Section: Influence Of Non-linear Loading Strategies On Emission Perfomentioning

confidence: 97%

Experimental Investigation of the Loading Strategy of an Automotive Diesel Engine under Transient Operation Conditions

Liu

Han

et al. 2018

Energies

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Targeting the performance optimization of an automotive diesel engine under transient operation conditions, in this research, the effect of several non-linear loading strategies on diesel performance have been experimentally analyzed using a heavy-duty turbocharged diesel engine running under transient conditions based on the constant 1650 r/min speed, the load is increased from 10% to 100% in a 5 s transition time The results show that the larger the early loading rate and change point load, the better the dynamic torque response. The peak values of smoke and CO and the transient average of brake specific fuel consumption (BSFC), soot and CO can be decreased by increasing the early loading rate by the loading strategies with the appropriate change point load during transient operation. However, combustion deteriorates under the loading process with an overlarge change point load, causing emissions to increase, and the larger the early loading rate, the worse the worsening. Based on the trade-off consisting of torque dynamic response, transient total and transient average of the BSFC and brake specific emissions, peak values of smoke and CO emissions, it is concluded that the loading strategy with the early loading rate is the 50% load per second and the change point load in the 25% load is the most suitable in these strategies.

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Section: Influence Of Non-linear Loading Strategies On Emission Perfomentioning

confidence: 97%

Experimental Investigation of the Loading Strategy of an Automotive Diesel Engine under Transient Operation Conditions

Liu

Han

et al. 2018

Energies

Self Cite

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“…In response to this issue, different loading strategies can be designed to suppress the NOx emissions during the start-up phase as loading strategies would have impacts on the engine-out emissions and exhaust temperatures. 20,21 Additionally, different loading strategies can improve the accuracy of air-fuel ratio control, so that the transient NOx emissions can be controlled well to meet the Beijing VI regulation.…”

Section: Introductionmentioning

confidence: 99%

Research on the potential of advanced engine loading strategy in meeting Beijing VI regulatory for a range-extended hybrid gas vehicle

Guan

Deng

Ning

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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Although the transient NOx emissions produced from a typical range-extended hybrid vehicle can meet the requirements of the China VI emissions regulations, it is rather difficult to comply with Beijing VI emissions regulations. This is due to the fact that the sharp fluctuation in air-fuel ratio control during engine start-up period resulting in lower conversion efficiency for the three-way catalyst (TWC). In response to these issues, the potentials of different loading strategies in meeting Beijing VI were explored on a light-duty natural gas (NG) engine for range-extended hybrid application. The experiments were performed on the basis of typical Chinese City Bus Cycle (CCBC). This paper analyzed the operation characteristics of the typical range-extended hybrid NG vehicle and investigated the impacts of engine loading strategy on the vehicle’s performance and emissions during the start-up phase. Results showed that the transient NOx emissions of 30 s-averaged decreased from 786 to 504 ppm when extending the loading time from 3 to 40 s in a typical loading path (i.e. engine speed and load increased linearly). The transient NOx emissions could meet the Beijing VI NOx limit but with little margin. Research also investigated the use of a new designed engine loading strategy (i.e. engine speed and load with time-separated control manner). Results revealed that this method effectively curbed the transient NOx emissions, reducing the maximum transient NOx emissions of 30 s-averaged from 504 to 271 ppm. In comparison, this low NOx level was better to meet the Beijing VI with sufficient margin.

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Study on the Effect of Exhaust Gas Recirculation Coupled Variable Geometry Turbocharger and Fuel Quantity Control on Transient Performance of Turbocharged Diesel Engine

2023

Energies

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With increasingly stringent emissions regulations, there are growing demands for the transient performance of diesel engines. This study conducted a transient bench test on a two-stage turbocharged heavy-duty diesel engine to optimize its performance during a load increase (20% to 100% in 1 s) at a constant speed (1200 RPM) transient process. The results showed that the transient control scheme using the low-pressure EGR system resulted in a 42.1% reduction in the peak value of soot emission, a 24.8% decrease in the peak value of NOx emission, a 9.14% decrease in ISFC and a 30.6% increase in maximum IMEP achieved in 1 s, compared to the steady-state optimization control scheme without EGR. Transient control scheme using the high-pressure EGR system resulted in a 24.4% reduction in the peak value of soot emission, a 31.8% reduction in the peak value of NOx emission, a 9.52% reduction in ISFC, and a 31.7% increase in maximum IMEP achieved in 1 s. The comparison of high and low-pressure EGR systems revealed that the low-pressure EGR system produced lower compromising emissions, while alterations in control parameters for the diesel engine with a high-pressure EGR system had a more significant impact on the transient process performance.

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Investigation of Sectional-Stage Loading Strategies on a Two-Stage Turbocharged Heavy-Duty Diesel Engine under Transient Operation with EGR

Cited by 5 publications

References 28 publications

Experimental Investigation of the Loading Strategy of an Automotive Diesel Engine under Transient Operation Conditions

Experimental Investigation of the Loading Strategy of an Automotive Diesel Engine under Transient Operation Conditions

Research on the potential of advanced engine loading strategy in meeting Beijing VI regulatory for a range-extended hybrid gas vehicle

Study on the Effect of Exhaust Gas Recirculation Coupled Variable Geometry Turbocharger and Fuel Quantity Control on Transient Performance of Turbocharged Diesel Engine

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