| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fuel pressure control device for an internal combustion engine enabling sure evacuation drive by continuing fuel pressure feedback control at desired high fuel pressure value with estimating fuel pressure based on a state of air fuel ratio even if abnormality of a fuel pressure sensor occurs. <P>SOLUTION: This device is provided with a fuel injection valve 51, an accumulator chamber of high pressure fuel, a high pressure pump, a fuel pressure control valve 10, the fuel pressure sensor 61 detecting fuel pressure PR in the accumulator chamber, an air fuel ratio sensor 68 detecting the state of air fuel ratio, a target value calculation means calculating target fuel pressure and target air fuel ratio AFo, a fuel pressure control means 102 performing feedback control of the fuel pressure control valve 10 to make fuel pressure PR meet target fuel pressure, an abnormality diagnosis means 101 for the fuel pressure sensor 61, and a fuel pressure estimation means 103 calculating estimated fuel pressure PRs based on the state of air fuel ratio at a time of occurrence of abnormality. The fuel pressure estimating means 103 corrects the estimated fuel pressure PRs in a direction converging the state of air fuel ratio to the target air fuel ratio AFo. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
