驾驶性能虚拟验证的动力总成试验台特性分析

Characterization of a Powertrain Test Bed in the Context of Virtual Validation of Drivability

摘要:

目前，汽车向软件定义和自动驾驶方向的发展趋势使得对车辆开发流程进行验证评估成为必须。采用控制单元的硬件在环测试来复现真实的物理世界和物理交互出现后，验证评估过程得以显著发展。在这其中，从道路到试验台的方法具备能减少验证时间和成本的巨大潜力。本文研究了动力总成试验台对驾驶性能的虚拟验证复现性。虽然车辆驾驶性能的模态频率大多发生在30 Hz以下，但试验台的设计与特性会显著影响测试的有效性，通过模态分析，展示了试验台对机械特性的影响；此外，确定了来自样件或试验台每个组件的固有模态敏感性，然而，测试设备的不确定性也会影响其有效性。为了提高测试验证的精确性，将国际标准（ISO/IEC Guide 98）应用于测试设备和试验台的设置。另外，介绍了一种新的客观测量方法（X-in-the-loop），并以驾驶性为示例进行了演示。本文所提出的客观指标和方法，有助于驾驶性能从道路试验到试验台试验的有效性追溯与确定。

Abstract:

Technological trends in the automotive industry toward a software-defined and autonomous vehicle require a reassessment of today’s vehicle development process. The validation process soaringly shapes after starting with hardware-in-the-loop testing of control units and reproducing real-world maneuvers and physical interaction chains. Here， the road-to-rig approach offers a vast potential to reduce validation time and costs significantly. The present research study investigates the maneuver reproduction of drivability phenomena at a powertrain test bed. Although drivability phenomena occur in the frequency range of most up to 30?Hz， the design and characteristics substantially impact the test setup’s validity. By utilization of modal analysis， the influence of the test bed on the mechanical characteristic is shown. Furthermore， the sensitivity of the natural modes of each component， from either specimen or test bed site， is determined. In contrast， the uncertainty of the deployed measurement equipment also affects the validity. Instead of an accuracy class indication， we apply the ISO/IEC Guide 98 to the measurement equipment and the test bed setup to increase the fidelity of the validation task. In conclusion， the present paper contributes to a traceable validity determination of the road-to-rig approach by providing objective metrics and methods.