| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a vehicle door monitor capable of certainly carrying out determination operation about door opening even if quietly opening a door of a vehicle, scarcely causing a malfunction without being influenced by an outdoor environment and capable of outputting a precise determination result. <P>SOLUTION: A variation of air in a cabin is detected by a variation sensor 1 and sent to an HPF 2, a high-frequency component is amplified by an amplifier 3 and sent to four comparators 51, 52, 53 and 54 after removing short period noise by an integrating circuit 4. The discrimination of the variation state of the air is carried out at four levels in the four comparators, a discrimination signal is sent out to a determination part 6 through an inverter 7, high decompression d1 is continuously discriminated within a specified period of time when weak decompression d3 is discriminated, it is determined that a door is opened in the case that strong intensified pressure d2 is discriminated within a following specified period of time, and operation to prohibit new determination operation is carried out until a specified period of time passes when a determination condition is not satisfied. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
