独立激励评估法在车身功能测试中的应用

Use of Stimulation-Independent Evaluation in the Context of Vehicle Body Domain

摘要:

车辆硬件在环仿真测试时，目前使用预先定义的测试结构，即测试结构将特定的测试激励与单独的测试步骤耦合到固定的、预先定义的测试体系中，测试后给出通过或不通过的结果。此方法中的每项测试都有其特定的功能测试重点，但无法适用于多项功能同时测试。未来的测试方法需要尽可能地完成全面性功能评估，并使评估资源得到有效利用，即应该在独立激励和现实环境中可同时对多项功能进行评估，因此，需要采用与之前不同的方法在独立激励的情况下进行测试。由于测试环境事先无法确定激励序列，因而也无法对每个测试步骤进行单独验证。激励的确切序列在测试运行开始时是未知的，从而可模拟出一个尽可能真实的现实环境，为此介绍一种独立激励的测试方法。该方法将组合法与基于模型法相结合，与相应功能测试要求联系起来，用于车身领域的系统性功能评估。该方法同样也支持现有的方法，并实现了比普通测试方法更广泛、更深入的评估覆盖面。该方法将在一家德国汽车制造商的车辆硬件在环舒适性功能测试中得到验证。

关键词:汽车测试;测试激励;独立激励;车身域

Abstract:

Currently established automotive test approaches in the field of vehicle hardware-in-the-loop （HiL） testing use predefined test structures. The test case structure couples a specific test stimulation with an individual test step to a fixed， predefined system validation with pass / fail result. Each test case has its own specific functional focus. If more than one functional aspect is to be tested， the current methods will not work anymore. The aim of future test methods is to evaluate the system as comprehensively and resource-efficiently as possible. If possible， several sub-functionalities should be evaluated at the same time in a randomly generated， realistic environment. A different validation approach is required for the evaluation of randomly generated stimulations sequences. Previously they are unknown to the evaluation environment. It is no longer possible to validate each test step individually. The exact sequence of the stimulation is not known at the beginning of the test run. This should simulate a behavior that is as realistic as possible. For this purpose， a methodology for the generation of system evaluation for randomly generated stimulations was introduced. Combinatorial and model-based approaches were combined to support the creation of system evaluation for the vehicle body domain （describes the passenger functions that can be experienced within a vehicle with its control units and functionalities， no direct influence on driving dynamics） and link them to the corresponding system requirements. The approach supports the existing methods and achieve a wider and deeper coverage of system assessments than a normal test catalogue implementation would give. This will be shown in a proof of concept with a vehicle comfort function on a HiL system at a German car manufacturer.

Key words:automotive testing;test stimulation;stimulation-independent;body domain