Patent ID: 7347188
Filing Date: 2008-03-25
Classification: F02D,F02M

Abstract:
1. A controller of a common rail fuel injection system that accumulates high-pressure fuel pressure-fed by a fuel pump in a common rail and that performs injection supply of the accumulated fuel into an engine through a fuel injection valve, the controller performing fuel pressure feedback control for conforming fuel pressure in the common rail to target pressure by driving and controlling the fuel pump, the controller comprising: a sensing device that senses the fuel pressure in the common rail; a calculation device that calculates a differential term of a control amount of the fuel pump based on a pressure deviation of the fuel pressure sensed by the sensing device with respect to the target pressure; a determination device that determines whether a determination condition is established, the determination condition established if the pressure deviation increases in accordance with an increase of the target pressure during reduction of the fuel pressure; and a restriction device that restricts reflection of the differential term in the control amount when the determination device determines that the determination condition is established.