| 摘要 |
<p>PROBLEM TO BE SOLVED: To highly accurately detect an injection start point from a fuel pressure change monitored by a pressure sensor provided on a common rail, and to correct injection start time and injection amount of an injector.SOLUTION: A control device 4 monitors a "pressure change in pressure-accumulation fuel" by high-speed sampling and obtains a virtual injection start point from an intersection point between an approximate line before injection and that during injection. At this time, the control device 4 obtains the virtual injection start point by adopting data on either "initial pilot injection having a small influence of pressure pulsation" or "main injection having large pressure change" that has a higher correlation coefficient relative to the approximate line. It is, therefore, possible to improve accuracy of the virtual injection start point, and enhance correction reliability by correcting current-carrying start timing Ton and a target current-carrying period Tq0 on the basis of a variationΔTn obtained from the virtual injection start point.</p> |
