| 摘要 |
PROBLEM TO BE SOLVED: To provide an electromagnetic driving valve control device capable of determining an open failure and a short failure of a regenerative diode provided in a driving circuit of an electromagnetic driving valve with a relatively simple structure.SOLUTION: It is determined that an open failure of a regenerative diode Di occurs when the voltage of a terminal of a solenoid Li of a fuel ejection valve which is connected to FETQi is detected as a monitor voltage VMi and the monitor voltage VMi in an open failure determination period TDOPN right after FETQi is shifted from an on-state to an off-state is equal to or above an open failure determination threshold value VTHOPN and it is determined that a short failure of the regenerative diode Di occurs when the monitor voltage VMi is equal to or above a short failure determination threshold value VTHSRT lower than the open failure determination threshold value VTHOPN in a period except the open failure determination period TDOPN. |
