Sensor Fault Detection and Diagnosis for Enhanced Safety of Autonomous Systems

许多现代系统，如自动驾驶汽车和制造系统，都在计算机的控制下运行。所有这些系统都依赖传感器，传感器可以测量速度、温度和压力等信息。然而，如果这些传感器中的一个发生故障，那么计算机可能会采取错误的操作，可能会伤害他人或损坏财产。因此，确保为计算机提供测量的所有传感器都正常工作是极其重要的。该项目旨在通过开发检查传感器提供的测量是否正确以及计算机是否可以安全使用的方法来增强这些系统的安全性。自适应延迟左反(ADLI)构造了动态系统的因果延迟左逆，它表示两组传感器之间的关系，即输入传感器(可疑传感器)和输出传感器(假设为健康传感器)之间的关系。将考虑传感器的多种组合，以确定输出传感器是否确实健康。来自健康传感器的测量被用来驱动延迟的左逆，其输出提供来自可疑输入传感器的预期测量的估计。通过将这些估计值与实际测量值进行比较，可以检测和诊断传感器故障。ADLI将应用于离散化的非线性运动微分方程式，将来自多个传感器的信号联系起来，从而为传感器故障检测和诊断提供手段。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

Many modern systems such as autonomous vehicles and manufacturing systems operate under the control of a computer. All of these systems rely on sensors, which measure things like speed, temperature, and pressure. If one of these sensors fails, however, then the computer may take an incorrect action that can hurt people or damage property. Therefore, it is extremely important to ensure all of the sensors that provide measurements for the computer are working correctly. This project aims to enhance the safety of these systems by developing methods for checking on whether the measurements provided by the sensors are correct and can be used safely by the computer.Adaptive delayed left inversion (ADLI) constructs a causal, delayed left inverse of a dynamical system that represents the relationship between two sets of sensors, namely, input sensors, which are suspect, and output sensors, which are assumed to be healthy. Multiple combinations of sensors will be considered in order to determine whether the output sensors are indeed healthy. Measurements from the healthy sensors are used to drive the delayed left inverse, whose output provides estimates of the expected measurements from the suspect input sensors. By comparing these estimates with the actual measurements, it is possible to detect and diagnose sensor faults. ADLI will be applied to discretized nonlinear kinematic differential equations that relate signals from multiple sensors, thus, providing the means for sensor fault detection and diagnosis.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.