The target rail pressure of the common rail is calculated on the basis of the Drive control manner of the metering valve in the common rail type fuel injection control

摘要

PROBLEM TO BE SOLVED: To correct irregularity of ejection amount characteristics of a metering valve of a fuel supply pump without causing disturbance to a stable rail pressure control state.;SOLUTION: A command pump ejection amount calculated according to the difference between a target rail pressure and an actual rail pressure by PID control is divided by a correction reflection coefficient facB. An energizing current corresponding to a correction command pump ejection amount as a result thereof is supplied to a metering valve 6. A necessary ejection amount theoretically needed is divided by a command pump ejection amount correction coefficient corresponding to the operation efficiency of a high pressure pump 7. The division result is divided by a correction command pump ejection amount for calculating a correction coefficient facA. By repeating calculation of the correction reflection coefficient facB by a predetermined calculation formula based on the correction coefficient facA, irregularity of the ejection amount characteristics of the metering valve 6 is corrected.;COPYRIGHT: (C)2011,JPO&INPIT