GPIO-based rail pressure control for diesel high pressure common rail injection system

Abstract

The rail pressure control in diesel high-pressure common rail (HPCR) system is considered as one of the key issues for precise control of fuel injection. This study investigates the application of generalised proportional integral observer (GPIO)-based control in diesel HPCR system. Firstly, a non-linear mathematical model of HPCR system which uses the metering unit as the actuator is established based on hydromechanics under some proper simplifications. Secondly, a GPIO is developed to estimate the mismatched disturbance caused by the injection process. Then a composite controller combining GPIO and backstepping control method is designed. By introducing the disturbance estimations into the control design process, the disturbance rejection capability of the system is promisingly enhanced. The effectiveness of the proposed control method is validated by the simulation results.

Keywords

• pressure control
• nonlinear control systems
• control nonlinearities
• diesel engines
• pi control
• control system synthesis
• fuel systems
• adaptive control
• observers
• gpio-based rail pressure control
• diesel high pressure common rail injection system
• diesel high-pressure common rail system
• fuel injection
• generalised proportional integral observer-based control
• diesel hpcr system
• nonlinear mathematical model
• injection process
• composite controller
• backstepping control method
• control design process