硬件在环测试台模拟车辆电池的电压分布

Simulation of Realistic Vehicle Battery Voltage Profiles on Hardware-in-the-Loop Test Benches

摘要:

驾驶辅助系统不仅是为了辅助驾驶员进行一般的驾驶活动，而且要能在关键情况下接管驾驶。使用原型车进行试驾是测试该系统最现实的方式，试驾可使驾驶辅助系统暴露在各种实际环境下，从而检查其可靠性。由于带有原型的测试驱动器成本很高，而且难以完全相同方式复制驾驶活动，因此在系统开发和测试过程中经常使用硬件在环（HiL）测试台。HiL测试台不仅提供相关硬件，还可以为这些被测系统（SUT）提供模拟环境。在实际车辆的试驾过程中，由于不同的环境影响，电气系统的电压会发生变化，这些变化是基于不断变化的电气负载影响。目前，车辆电气系统的电压变化无法在硬件在环测试台上模拟。为了确定电压变化的原因和潜在现象，需要对实际试驾记录数据进行检查，以了解潜在现象。然后将这些结果用于推导唯象激励，该唯象激励可用于模拟测试台上的真实电压曲线。本文分析了车辆测量结果，目的是找出车载电压长期和短期热变化的可能原因，提出一种在HiL测试台上进行虚拟测试驱动的情况下真实模拟电压变化的方法。

Abstract:

Driver assistance systems are designed not only to support the drivers in their general driving activities but also to be able to take over in critical situations， too. Test drives with a prototype vehicle are the most realistic way to test these systems. The test drive exposes the systems to all kinds of environmental influences and examines their reliability. Since test drives with prototypes are very costly and difficult to reproduce in the exact same way， hardware-in-the-loop （HiL） test benches are often used in the development and testing process. HiL test benches providing the relevant hardware and can also provide simulated environmental influences for these systems under test （SUT）. During test drives with real vehicles， variations in the electrical system voltage occur due to the different environmental influences. These variations are based on changing electrical loads. Currently these variations in the vehicle electrical system voltage cannot be simulated on HiL test benches. In order to identify causes and underlying phenomena of the variations， recorded data from real test drives are examined with respect to possible phenomena. These results are then used to derive a phenomenological stimulation that can be used to simulate realistic voltage curves on test benches. The paper analysis vehicle measurements with the aim of finding possible causes for the long and short-therm change of the on-board voltage. This paper presents an approach for realistic stimulation of voltage variations in the context of virtual test drives on HiL test benches.