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首页> 外文会议>ASME Internal Combustion Engine Division technical conference >EGR AND BACKPRESSURE EFFECTS ON KNOCK BEHAVIOR IN STOICHIOMETRIC NATURAL GAS ENGINES
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EGR AND BACKPRESSURE EFFECTS ON KNOCK BEHAVIOR IN STOICHIOMETRIC NATURAL GAS ENGINES

机译：EGR和反压效应对化学计量比天然气发动机的爆震行为的影响

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摘要

Increasingly restrictive limits on NOx levels are driving the change from lean-burn to stoichiometric combustion strategies on heavy-duty on-highway natural gas engines in order to take advantage of inexpensive and effective three-way catalyst technology. The change to stoichiometric combustion has led to increased tendency for engine knock due to higher in-cylinder temperatures. Exhaust Gas Recirculation (EGR) has been proposed as a method to suppress knock via charge dilution while maintaining a stoichiometric air-fuel ratio. Two of the more common EGR driving architectures and the challenges associated with each architecture are described. A series of engine tests were devised and performed on a 7-liter heavy-duty natural gas engine to explore the relationships between EGR knock suppression and engine backpressure. A unique concept for an external EGR pumping cart which allowed for the exploration of higher EGR rates independent of backpressure is also described. Results showed that for the conditions tested, increasing EGR rates beyond a certain point did not result in decreased knock tendency. ID Simulation showed that the effectiveness of the EGR is limited by trapped hot residual gasses which resulted in higher in-cylinder temperatures and nullified the cooling effects of the EGR. These results suggest that attention must be paid to reducing backpressure via efficient EGR system architecture design in order to achieve the highest possible efficiency.
机译：对NOx水平的越来越严格的限制是推动从倾斜到高速公路天然气发动机的化学计量燃烧策略的变化，以利用廉价且有效的三元催化剂技术。由于圆柱体温度较高，化学计量燃烧的变化导致发动机爆震的趋势增加。已经提出了废气再循环（EGR）作为抑制通过电荷稀释的方法，同时保持化学计量的空燃比。描述了两个更常见的EGR驾驶架构以及与每个架构相关联的挑战。在7升重型天然气发动机上设计了一系列发动机测试，以探索EGR敲除抑制和发动机背压之间的关系。还描述了一种独特的外部EGR泵送车的概念，其允许探索较高的BGR速率，与背压无关。结果表明，对于经过测试的条件，提高超出某一点的EGR率并未导致爆震趋势降低。 ID模拟表明，EGR的有效性受到截留的热残余气体的限制，导致圆柱体温度较高，并使EGR的冷却效果无效。这些结果表明，必须通过高效的EGR系统架构设计来减少背压的注意力，以实现最高效率。

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