Abstract: An active disturbance rejection control algorithm was designed to have a better control ability with faster response speed to intake oxygen concentration of electrically- assisted-turbocharger (e-Turbo) diesel engine. An observer of intake and exhaust oxygen concentration for control was established being used as a virtual oxygen sensor. The control algorithm was tested and evaluated on a precisely calibrated GT-Power diesel engine model. The results show that the average response time decreases by 0.86 s comparing with traditional proportion-integral-differential (PID) control during the changes of the target intake oxygen concentration in the simulation. The maximum relative error to the target is 2.33% during the transient process at engine tests. Therefore, the active disturbance rejection control algorithm achieves a rapid control of intake oxygen concentration.

Key words: diesel engine, electrically assisted turbocharger (e-Turbo), intake oxygen concentration observer, active disturbance rejection control