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Parametric Study of CNG-DI Engine Operational Parameters by Using Analytical Vehicle Model

机译:使用分析车模型参数研究CNG-DI发动机操作参数

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A parametric study of engine's influential parameters on compressed natural gas direct injection (CNG-DI) engine's torque was performed by using a dynamic, analytical model of the CNG-DI vehicle. The objective of the study is to analyze the effect of the selected six parameters on the engine's total brake torque. The simulations were carried out to mimic the speed-sweep test procedure of the vehicle on a chassis dynamometer. Based on the actual test setup, a ramp input is provided on the power pedal and the vehicle is allowed to accelerate under the influence of dynamometer inertia load only. Based on the results, the most influential parameter on the maximum engine torque is the injection pressure. The maximum predicted engine mean brake torque at 60 bar injection pressure is about 120 Nm. The second influential parameter is the injection duration, where the maximum predicted engine brake torque is about 100 Nm. Both parameters are related to the controlling amount of the fuel-injected, which affected the amount of energy released into the cylinder. The third influential parameter is the ignition timing, where the maximum pressure predicted is closed to 70 bar. It can be concluded that the magnitude of brake torque is sensitive to the amount of fuel supplied for combustion. This comprehensive model is suitable for parametric analysis regardless of the expensive computing time.
机译:通过使用CNG-DI车辆的动态分析模型进行发动机对压缩天然气直接喷射(CNG-DI)发动机扭矩进行的参数研究。该研究的目的是分析所选六个参数对发动机总制动扭矩的影响。进行了模拟以模仿车辆在底盘测力计上的速度扫描测试程序。基于实际测试设置,在功率踏板上提供斜坡输入,并且允许车辆在测力计惯性载荷的影响下加速。基于该结果,最大发动机扭矩上最具影响力的参数是注射压力。在60巴里注入压力下的最大预测发动机表示制动扭矩约为120nm。第二个影响力参数是注入持续时间,其中最大预测发动机制动扭矩约为100nm。两个参数与燃料喷射的控制量有关,这影响了释放到汽缸中的能量的量。第三个影响力参数是点火正时,其中预测的最大压力关闭到70巴。可以得出结论,制动扭矩的大小对供应燃烧的燃料量敏感。无论昂贵的计算时间如何,该综合模型适用于参数分析。

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