Reliability Improvement of Global Chassis Control

Global chassis control maximizes chassis control performance by integrating and controlling individual chassis control systems in an integrated and compensatory manner. A global chassis control system thus requires high reliability, even in case of failure or fault. The system should be capable of detecting failure under various conditions, and responding to failure appropriately to guarantee uninterrupted performance. In this paper, we propose a fail-safe strategy to improve reliability of the global chassis control system. We have implemented the global chassis control system in a way that a higher-level controller monitors driver intention and vehicle status, and then commands lower-level, chassis controllers to maximize vehicle performance. Depending on failure detection types of sensors and actuators in the control system, we developed different fail-safe methods: we combined actual hardware sensors and virtual algorithm sensors appropriately depending on whether other sensor signals can be used to determine failure of the sensor or not. Simulation results demonstrate effectiveness of the fail-safe strategy and improvement of system reliability