| 摘要 |
PROBLEM TO BE SOLVED: To make control simple to reduce a processing load of control while increasing a dynamic range of injection quantity.SOLUTION: A fuel injection system includes a first injection valve 30, a second injection valve 40, a communication pipe 70, and an ECU 50 (control means). The communication pipe 70 provides communication between a second passage 41b of the second injection valve 40 and a back pressure chamber 31c of the first injection valve 30. The ECU 50 controls an electric actuator of the second injection valve 40 to switch first injection control and second injection control in response to required injection quantity. The first injection control allows a second valve body 42 to open for a predetermined period of time or more to reduce a back pressure Pm to a pressure causing a first valve body 32 to open. The second injection control allows the second valve body 42 to open for less than the predetermined period of time not to reduce the back pressure Pm to the pressure causing the first valve body 32 to open. |
