| 摘要 |
PURPOSE:To prevent an erroneous operation of the titled device, by arranging such that a fuel injection can be switched with the passage of predetermined time period after the recovery of electric voltage, in a control device utilizing a backup circuit to inject a fuel at the time of electric power voltage drop. CONSTITUTION:A low voltage detecting circuit 21 detects a voltage drop such that a microcomputer 18 can no longer operate properly. Upon a predetermined time period being passed after an electric power voltage recovers its normal value and the microcomputer 18 operates properly, a time limit circuit 22 reverse its output. The predetermined time period may, as for instance, be set at such a duration that allows a clock generation to be normal. In this manner, it is possible to prevent the titled device from operating erroneously at the time of electric power recovery, as injecting a fuel alternately by means of a backup circuit and the microcomputer. |
