Development of a spark ignition free-piston engine generator
Development of a spark ignition free-piston engine generator
复制标题
火花点火式自由活塞发动机发电机的研制
DOI：
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发表时间：
2015
期刊：
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通讯作者：
M. R. Hanipah
中科院分区：
文献类型：
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作者：
M. R. Hanipah
研制了双活塞式二冲程火花点火自由活塞发动机发电机样机。对近年来国内外学术界和工业界关于自由活塞发动机发电机的研究成果和专利文献进行了综述，特别是对串联式混合动力汽车的应用进行了分析。影响操作性能的相关参数和一些挑战已被确定为该技术的共同标准。使用一维工具的建模和模拟与开发活动同时进行。在转换为自由活塞发动机模型之前，开发、验证和优化了曲轴发动机的三个主要仿真模型。这是通过使用强加活塞运动子模型。对二冲程自由活塞发动机模型进行了配气相位优化的参数研究。利用开发的freepiston发动机-发电机样机进行了电动机试验，验证了该模型的有效性。从实验结果来看，自由活塞发动机发电机的电动机驱动性能能够满足启动的目标循环速度和压缩压力。然而，由于气动致动器中固有的阀门延迟，自由活塞发动机发电机的运行速度被限制在5 Hz及以下。的电动机的结果被用来验证自由活塞发动机模型，在不同的启动速度显示出良好的协议。最后，性能和参数的调查进行了使用最终验证和完善的freepiston发动机模型。通过仿真发现，自由活塞发动机对空燃比和点火位置变化的响应与曲轴发动机相似，但性能略有降低。此外，减少的摩擦损失对其性能增益的贡献很小。然而，在freepiston发动机中观察到的在TDC附近的活塞运动对发动机性能的高影响可以被操纵以显著地提高其性能。
A dual-piston type two-stroke spark-ignition free-piston engine generator prototype has been developed. A comprehensive review on recent published researches and patent documents from academia and industrial organisations on free-piston engine generator, especially on the applications for series hybrid electric vehicles, was conducted. Relevant parameters affecting the operating performance and a number of challenges had been identifiedas the common denominator for this technology. Modelling and simulations using one-dimensional tools were conducted in parallel with the development activities. Three main simulation models for the crankshaft engines were developed, validated and optimised before converted into the free-piston engine model. This was done by using imposed-piston motion sub-model. The two-stroke free-piston engine model had undergone parametric study for valve timing optimisation. This model was validated by using motoring experimental results using the developed freepiston engine generator prototype. From the experimental results, the free-piston engine generator motoring performance was able -to meet the targeted cyclic speed and compression pressure for starting. However, the free-piston engine generator operating speed was limited to 5Hz and below due to valve delay inherent in the pneumatic actuators. The motoring results were used to validate the free-piston engine model which showed a good agreement at various starting speeds. Finally, performance and parametric investigations were conducted using the final validated and refined freepiston engine model. From the simulation, it was found that the free-piston engine had similar response to air-fuel ratio and ignition position variations compare to crankshaft engine with the free-piston engine performance was slightly reduced. Further, the reduced frictional losses contributed little to its performance gain. However, the high influence of piston motion around TDC on the engine performance, observed in freepiston engine, could be manipulated to increase its performance significantly.