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首页> 外文期刊>Sensors and Actuators >Design and development of a probe-based multiplexed multi-species absorption spectroscopy sensor for characterizing transient gas-parameter distributions in the intake systems of I.C. engines
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Design and development of a probe-based multiplexed multi-species absorption spectroscopy sensor for characterizing transient gas-parameter distributions in the intake systems of I.C. engines

机译：基于探针的多物种多物种吸收光谱传感器的设计和开发，用于表征I.C.进气系统中的瞬态气体参数分布。引擎

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摘要

A 4-probe multiplexed multi-species absorption spectroscopy sensor system was designed and developed for gas property measurements on the intake side of commercial multi-cylinder internal-combustion (I.C.) engines; the resulting cycle- and cylinder-resolved concentration, temperature and pressure measurements are applicable for assessing spatial and temporal variations in the recirculated exhaust gas (EGR) distribution at various locations along the intake gas path, which in turn is relevant to assessing cylinder charge uniformity, control strategies, and computational fluid dynamics (CFD) models. The diagnostic is based on absorption spectroscopy and includes an H_2O absorption system (utilizing a 1.39 μm distributed feedback (DFB) diode laser) for measuring gas temperature, pressure, and H_2O concentration, and a CO_2 absorption system (utilizing a 2.7 pm DFB diode laser) for measuring CO_2 concentration. The various lasers, optical components and detectors were housed in an instrument box, and the 1.39-μm and 2.7-μm lasers were guided to and from the engine-mounted probes via optical fibers and hollow waveguides, respectively. The 5 kHz measurement bandwidth allows for near-crank angle resolved measurements, with a resolution of 1.2 crank angle degrees at 1000 RPM. The use of compact stainless steel measurement probes enables simultaneous multi-point measurements at various locations on the engine with minimal changes to the base engine hardware; in addition to resolving large-scale spatial variations via simultaneous multi-probe measurements, local spatial gradients can be resolved by translating individual probes. Along with details of various sensor design features and performance, we also demonstrate validation of the spectral parameters of the associated CO_2 absorption transitions using both a multi-pass heated cell and the sensor probes.
机译：为在商用多缸内燃机的进气侧测量气体特性而设计并开发了一种4探针多物种多物种吸收光谱传感器系统;所得的循环和气缸分辨浓度，温度和压力测量结果可用于评估沿进气路径不同位置的再循环废气（EGR）分布的时空变化，进而与评估气缸充气均匀性有关，控制策略和计算流体动力学（CFD）模型。该诊断基于吸收光谱，包括用于测量气体温度，压力和H_2O浓度的H_2O吸收系统（利用1.39μm分布式反馈（DFB）二极管激光器）和CO_2吸收系统（利用2.7 pm DFB二极管激光器） ）以测量CO_2浓度。各种激光器，光学组件和检测器都放置在仪器箱中，并且分别通过光纤和中空波导将1.39-μm和2.7-μm激光引导至引擎安装的探头或从引擎安装的探头中引出。 5 kHz的测量带宽可实现近曲轴角分辨率的测量，在1000 RPM时分辨率为1.2曲轴角度。紧凑型不锈钢测量探头的使用可在发动机的各个位置同时进行多点测量，而对基础发动机硬件的改动却很小。除了通过同时进行的多探针测量解决大规模的空间变化外，还可以通过平移单个探针来解决局部空间梯度。连同各种传感器设计功能和性能的详细信息，我们还演示了使用多通道加热池和传感器探头对相关CO_2吸收跃迁的光谱参数的验证。

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