| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a switch state discriminating device that can discriminate an ON-OFF state of an ignition switch, regardless of residual capacity of an on-vehicle battery. <P>SOLUTION: When the ON-OFF state of the ignition switch 5 cannot be discriminated by a first discriminating mode 37a, a mode is switched to a second discriminating mode 37b. The first discriminating mode 37a reads in voltage detected by a source voltage detecting means 36 with each predetermined sampling time T, and discriminates as being in an ON state when continuously detecting a state where the voltage exceeds an ON discriminating threshold value V1 by n1 time until a predetermined period T1 passes after detecting the fact of exceeding the ON discriminating threshold value V1. The second discriminating mode 37b discriminates as being in the ON state when detecting that source voltage exceeds the ON discriminating threshold value V1 by N time until a predetermined period TA passes after detecting the fact of exceeding the ON discriminating threshold value V1. <P>COPYRIGHT: (C)2013,JPO&INPIT |
