| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To detect that a noise is supplied to a power supply line while trying not to detect normal voltage application as a noise. <P>SOLUTION: A size is compared by a microcomputer 8 between potential V1 of a partial pressure circuit 10 and voltage V2 of a smoothing circuit 9. When the voltage V1 of the partial pressure circuit 10 is larger than the voltage V2 of the smoothing circuit 9, a motor 16 is allowed to operate; when the voltage V2 of the smoothing circuit 9 is larger than the voltage V1 of the partial pressure circuit 10, operation of the motor 16 is prohibited. Thus, when by any chance a battery 3 comes off, lowering of source voltage due to the operation of the motor 16 can be prevented. Also, when power generation voltage to be a pulse wave is applied to an ECU 1, the voltage V2 of the smoothing circuit 9 not instantaneously but gradually increases. Thus, even when pulsating voltage is applied to the power supply line 4 for a fixed period of time or for certain number of times as when clanking is performed, it is possible to exclude such a situation and to detect power supply noise. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
