Method of and device for controlling pressure in accumulation chamber of accumulation fuel injection apparatus

Abstract

A method of and a device for controlling a pressure is provided in which control performance of accumulation chamber pressure is not deteriorated even in the presence of a disturbance by estimating, with observer control, a disturbance pressure that acts on an accumulation chamber (common rail) constituting an accumulator fuel injection apparatus adapted for use in a diesel engine and the like, and by correcting a pump discharge command with a compensation value capable of compensating for the estimated disturbance pressure. Provision of a feedback control unitcapable of calculating a pump discharge command value of a fuel pump based on a pressure difference between an actual accumulation chamber pressure detected by a fuel pressure sensorand a target pressure of an accumulation chamber and a disturbance observer control unitcapable of deriving a compensation value compensating the disturbance by the numerical model of the pump discharge command value to the fuel pump, the disturbance pressure acting on the accumulation chamber, and an accumulation chamber pressure by using a transfer function of the fuel pump and by estimating the disturbance pressure from the numerical model, and an output from the feedback control unitis corrected with the disturbance compensation value from the disturbance observer control unit