| 摘要 |
Fuel injection method and apparatus for engines, wherein an accumulator pressure at the fuel injection starting time is determined on the basis of an approximate function, which is determined on the basis of the pressure of a working fluid in the accumulator detected in a predetermined sampling cycle, and an operating period of a control valve for a working fluid in an injector is thereby controlled accurately. An approximate function pr(t) of the accumulator pressure is determined on the basis of a plurality of detected values Pr1-Prn of the pressure in the accumulator determined in a predetermined cycle. A set value Prs of the accumulator pressure at the fuel injection time Tinj is determined on the basis of the approximate function Pr(t), and a control valve driving period required to execute a target injection rate on the basis of the set value Prs. Owing to an operation of the control valve controlled during the driving period, a fuel is injected from an injector by utilizing the effect of the pressure of the working fluid.
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