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Development of a Powertrain for a Formula SAE Competition Vehicle

机译：开发配方SAE竞争车辆的动力系

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This paper reports the results of engine development for our Formula SAE competition vehicle. To utilize growth rate effect of powertrain weight on overall vehicle weight, single-cylinder engine, Honda CRF450, was chosen as the base unit. However, as this base engine is naturally aspirated and its piston displacement of 0.45 l is much less than the regulation upper limit, we installed a turbocharger unit for a three-cylinder engine having 0.6 l piston displacement installed on Suzuki mini-cars because of its size and price. In the first step, we estimated the engine performances using gas exchanging process simulation using AVL Boost because the software has convenient function of modeling turbocharger. Because of the lack of both our experience and data base, we discarded the idea of driving the turbocharger dynamically following the engine operating conditions precisely. Instead, a somewhat large capacity surge tank was installed in between the turbocharger and the intake manifold. By selecting a suitable volume of the tank, the engine can breathe practically enough amount of air at almost all the engine operating conditions. We believe that this intake system design method with a surge tank helps engine designers installing a turbocharger without precise design database. To evaluate the above-mentioned design, a chassis dynamometer test was conducted. In this test, a turbocharger with much larger capacity that is for 1.2 l engine was also tested as a reference. The measured maximum power reached to 75 kW, and the maximum torque was 70 Nm from 5,000 rpm to 7,000 rpm. By tuning the powertrain final gear ratio, the vehicle almost achieved the aimed acceleration performance.
机译：本文报告了通用式SAE竞争车辆发动机开发结果。利用动力总成重量对整体车辆重量的生长速率影响，选择单缸发动机本田CRF450作为基本单元。然而，由于这种基本发动机自然吸气，并且其活塞位移为0.45L的速度小于调节上限，因此我们为三缸发动机安装了一个具有0.6L活塞位移的三缸发动机，因为它大小和价格。在第一步中，我们估计了使用AVL提升的气体交换过程仿真估计发动机性能，因为该软件具有方便的涡轮增压器功能。由于我们的经验和数据库缺乏，我们丢弃了在发动机运行条件下动态地驱动涡轮增压器的想法。相反，在涡轮增压器和进气歧管之间安装了一个大容量的电涌罐。通过选择合适的罐量，发动机可以在几乎所有发动机操作条件下呼吸到足够量的空气。我们认为，这种具有浪涌罐的进气系统设计方法可帮助发动机设计师安装涡轮增压器，无需精确设计数据库。为了评估上述设计，进行底盘测力计测试。在该测试中，还测试了一个具有更大容量的涡轮增压器作为1.2L发动机的参考。测量的最大功率达到75 kW，最大扭矩为70nm，从5,000 rpm到7,000rpm。通过调整动力系最终齿轮比，车辆几乎实现了旨在的加速性能。

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