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| A study on the effect of Atkinson rate cooperate with exhaust gas dilution rate on the performance of high-efficiency gasoline engine |
| DOI：10.13949/j.cnki.nrjgc.2024.04.006 |
| Key Words:Atkinson rate, EGR rate, high-efficiency gasoline engine, performance impact, synergistic effect |
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| 摘要点击次数: 120 |
| 全文下载次数: 0 |
| Abstract:In order to quantify the effect of Atkinson (ATK) effect on the power performance and fuel consumption of high efficiency gasoline engines with high compression ratio, a definition of ATK rate (Ratk) is proposed, which takes into account the effective expansion ratio and effective compression ratio. The effects of different Atkinson cycle schemes on the performance of the whole machine were studied on the bench. Based on the optimal scheme and the Best Thermodynamic Efficiency (BTE) working condition, The influence of different ATK rate and Exhaust Gas Recirculation (EGR) rate on fuel consumption was studied in detail. The results show that: with the increase of Ratk, the rated torque shows a trend of increasing and then rapidly decreasing; the fuel consumption at the BTE condition point first rapidly decreases and then gradually slows down; and the fuel consumption at the characteristic point shows a trend of increasing and then rapidly decreasing. Overall, the system maximum Atkinson rate increases from 1.62 to 1.84, the characteristic operating point fuel consumption decreases by 3.5g.(kW.h)-1, the best fuel consumption decreases by 2.5g.(kW.h)-1, and the power decreases by 3 N.m. In addition, in the BTE operating condition, there is a certain coupling relationship between the ATK rate and the external EGR, and the maximum can’t be obtained at the same time. When the ATK rate is at a medium-low value, the optimal Fuel consumption performance can be achieved. |
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