PROBLEM TO BE SOLVED: To make sure of the operation of an abnormality detection unit without using a pseudo abnormality signal.SOLUTION: The present invention relates to a liquid injection device, comprising: a piezoelectric element for varying the capacity of a liquid chamber in communication with an injection pipe that injects a liquid a supply motor for supplying the liquid to the liquid chamber an input unit for inputting a drive signal to the piezoelectric element and/or the supply motor an abnormality detection unit that detects abnormality in at least one of the following detection objects: the drive signal input to the piezoelectric element, the input unit, and the supply motor a setting unit for setting the abnormality detection unit to a state in which the abnormality detection unit detects abnormality in a normal detection object and a control unit capable of making sure of the operation of the abnormality detection unit.SELECTED DRAWING: Figure 11COPYRIGHT: (C)2017,JPO&INPIT【課題】疑似異常信号を用いずに、異常検出部の動作を確認すること。【解決手段】液体を噴射する噴射管に連通する液体室の容積を変動させる圧電素子と、前記液体室に液体を供給するための供給モーターと、前記圧電素子と、前記供給モーターとのうち少なくとも1つに対して駆動信号を入力する入力部と、前記圧電素子に入力される前記駆動信号と、前記入力部と、前記供給モーターと、のうち少なくとも1つを検出対象として、異常を検出する異常検出部と、前記異常検出部を、正常な前記検出対象を異常と検出する状態に設定する設定部と、前記異常検出部の動作確認を実行可能な制御部と、を備える液体噴射装置。【選択図】図11
