Motor test bed with high-speed camera

该应用主要涉及为发动机测试台配备必要的部件和设备，用于内燃机中过程的光学分析。工作组已经可以使用的测试台的核心是一个光学单缸乘用车发动机，它有一个石英玻璃环，而不是金属缸套。这为燃烧室提供了良好的光学可达性。未来，将在燃烧室中对该发动机进行光学分析，以便更深入地了解发生的过程，从而得出有针对性的措施，从而提高效率并减少排放。需要额外的设备来进行光学分析领域的研究工作。该应用的主要设备是一个高速摄像机系统，由具有紫外线功能的摄像机和具有紫外线功能的内窥镜组成，该系统还允许通过气缸盖观察轴线。其目的是可视化燃烧过程和污染物的形成。对于同时需要的发动机工作点的热力学特性，需要指示系统来记录具有高时间分辨率的测量值，例如气缸压力、点火和喷射信号。对于发动机运行本身，需要测试台控制系统来记录和处理所有相关的测量变量（速度、扭矩、温度、压力等）。并控制发动机的运行。此外，还需要一个可编程的发动机控制系统，根据试验台上的边界条件和规格来控制燃油喷射和点火。一个带压力测量的气体加压蓄能器将用于燃料供应。新鲜空气质量由空气质量计检测，空气和燃料质量的理想比例由λ计控制。由于发动机在光学分析过程中通常只在点火模式下运行很短的时间-在某些情况下只有几个循环-稳态条件很少遇到。然而，为了实现最佳的再现性，建议使用合成混合物进行废气再循环。这就需要为各个气体成分配备合适的体积流量控制器。在厂房方面，需要对发动机安装室进行一些改造。在建筑物的上层，有一个用于新鲜空气供应的空调装置和一个废气抽取系统。天花板穿透是必要的，以连接发动机到两个单位，以及连接本身。此外，还需要对发动机的氢气操作进行研究，这意味着需要扩展试验台，配备必要的安全装置和氢气供应连接。

This application essentially involves equipping an engine test bench with the necessary components and equipment for the optical analysis of processes in the internal combustion engine. The core of the test bench, which is already available to the working group, is an optical single-cylinder passenger car engine that has a quartz glass ring instead of a metallic cylinder liner. This provides good optical accessibility to the combustion chamber. In the future, optical analyses are to be carried out on this engine in the combustion chamber, which will enable a deeper understanding of the processes taking place in order to derive targeted measures that will lead to an increase in efficiency and a reduction in emissions.Additional equipment is required to carry out the intended research work in the field of optical analysis. The main equipment of the application is a high-speed camera system consisting of the UV-capable camera and a UV-capable endoscope, which also allows observation axes through the cylinder head. The intention is to visualize the combustion process and pollutant formation. For the simultaneously required thermodynamic characterization of engine operating points, an indication system is needed to record measured values with high temporal resolution, such as cylinder pressure, ignition and injection signals. For the engine operation itself, a test bench control system is required to record and process all relevant measured variables (speed, torque, temperatures, pressures, etc.) and to control the engine operation. Furthermore, a programmable engine control system is required that controls fuel injection and ignition depending on the boundary conditions and specifications at the test bench. A gas-pressurized accumulator with pressure measurement is to be used for fuel supply. The fresh air mass is to be detected by an air mass meter, and the desired ratio of air and fuel mass is to be controlled by a lambda meter.Since engines often operate in fired mode for only a very short time during optical analysis - in some cases only a few cycles - steady-state conditions are seldom encountered. In order to nevertheless achieve the best possible reproducibility, it is advisable to use a synthetic admixture for exhaust gas recirculation. This requires appropriate volume flow controllers for the individual gaseous components.On the building side, some modifications are necessary in the engine installation room. On the upper floor of the building, there is a conditioning unit for the fresh air supply and an exhaust gas extraction system. Ceiling penetrations are necessary to connect the engine to both units, as well as the connection itself. Furthermore, investigations of an engine operation with hydrogen are to be realised, which means an extension of the test stand with the necessary safety devices and connections to a hydrogen supply.