Automotive G vector control for comfort improvement and experimental verification

Abstract

The normal vehicle lateral motion control systems such as electric stability control system (ESC) work only when the vehicle tends to be unstable. Expert driver operations show that the longitudinal acceleration can be adjusted during curving to improve ride comfort and avoid vehicle instability to a certain extent. The brake-by-wire system can automatically adjust the longitudinal acceleration without relying on the driver to apply braking to improve the lateral motion performance. Starting from comfort evaluation during curve movement, the relationship between comfort and lateral acceleration is analysed. In order to reduce control fluctuations and improve real-time control, the steering wheel signal is selected as input and a fuzzy rule is proposed as the G vector control (GVC) law. Finally, the control method is applied on an experimental vehicle through a real-time simulation system to verify its effectiveness.