CONTROL DEVICE OF FUEL INJECTION DEVICE

PROBLEM TO BE SOLVED: To suppress solid variation of a fuel injection amount by estimating a valve opening time without affected by magnetic fluctuation, as in a DI injector, high-pressure voltage of several tens of volts is applied to allow electric current to quickly flow, which causes magnetic fluctuation, thus change of electric current by valve opening does not occur.SOLUTION: A control device of a fuel injection device controlling a fuel injection characteristic by controlling opening/closing of a fuel injection valve by controlling electric current and voltage applied to a solenoid of the fuel injection device, is composed of means for filtering driving voltage of the fuel injection device, means for extracting peak time difference appearing on filter output corresponding to valve closing of the fuel injection device, and means for correcting driving electric current on the basis of the peak time difference, so that the longer the peak time difference is, the longer a time of flowing of the driving electric current is elongated.SELECTED DRAWING: Figure 7 【課題】ＤＩインジェクタでは数十ボルトの高圧電圧を印加し、電流を急速に流すため、磁気飽和が起こり、開弁による電流変化が発生しない。そこで、本発明は磁気飽和の影響を受けることなく、開弁タイミングを推定し、燃料噴射量の固体ばらつきを抑えることにある。【解決手段】燃料噴射装置のソレノイドに印加する電流及び電圧を制御することで燃料噴射弁の開閉を制御し、燃料噴射特性を制御する燃料噴射装置の制御装置において、燃料噴射装置の駆動電圧をフィルタリングする手段と、燃料噴射装置の閉弁に対応してこのフィルタ出力に現れるピーク時間差を抽出する手段と、ピーク時間差に基づいて駆動電流を補正する手段から構成され、ピーク時間差が長い程駆動電流が流れる時間を長くすることを特徴とする燃料噴射装置の制御装置を用いることで上記課題は解決できる。【選択図】図7