Fuel injection control device
AssigneeHitachi Automotive Systems, Ltd.
InventorsHaoyun Shi, Yuuki Okuda, Masahiro Toyohara
Life of this patent
Estimating the term…
Abstract
Provided is a fuel injection control device capable of accurately detecting a valve opening delay time of a fuel injection valve, and implementing high-precision minute injection control. A valve opening delay time of a fuel injection valve is estimated on the basis of a plurality of valve closing delay times obtained when the fuel injection valve is operated with injection pulse widths that are different injection pulse widths from each other and with which the fuel injection valve is in an intermediate lift state.
Claims12
A fuel injection control device with which a fuel injection valve is controlled in an intermediate lift state,
- the fuel injection control device estimating a valve opening delay time of the fuel injection valve on the basis of a plurality of valve closing delay times, the plurality of valve closing delay times being obtained when the fuel injection valve is operated with injection pulse widths that are different injection pulse widths from each other and with which the fuel injection valve is in the intermediate lift state.
A fuel injection control device with which a plurality of fuel injection valves is controlled in an intermediate lift state,
- the fuel injection control device estimating a valve opening delay time of each of the fuel injection valves on the basis of a plurality of valve closing delay times, the plurality of valve closing delay times being obtained when the fuel injection valves are operated with injection pulse widths that are different injection pulse widths from each other and with which the fuel injection valves are in the intermediate lift state, and correcting a drive current so as to increase a boost application time from drive current supply start to reaching a maximum value, for a fuel injection valve having a longer valve opening delay time estimated than a valve opening delay time estimated of another fuel injection valve.
A fuel injection control device with which a plurality of fuel injection valves is controlled in an intermediate lift state,
- the fuel injection control device estimating a valve opening delay time of each of the fuel injection valves on the basis of a plurality of valve closing delay times, the plurality of valve closing delay times being obtained when the fuel injection valves are operated with injection pulse widths that are different injection pulse widths from each other and with which the fuel injection valves are in the intermediate lift state, and correcting the injection pulse widths so as to increase each of the injection pulse widths, for a fuel injection valve having a longer valve opening delay time estimated than a valve opening delay time estimated of another fuel injection valve.
Dependencies are inferred from the claim text.