| 摘要 |
<P>PROBLEM TO BE SOLVED: To automatically change to an appropriate control parameter according to a case where detecting a dew point and where detecting a frost point without requiring a user to acquire a state on a mirror surface. <P>SOLUTION: If a temperature of a mirror surface is -5°C or more, a mirror surface cooling type sensor selects a control parameter for a high dew-point region to control a supply current to a first thermoelectric cooling element (Peltier for cooling the mirror surface). If the mirror-surface temperature is less than -5°C, the mirror surface cooling type sensor selects a control parameter for a low dew-point region to control the supply current to the first thermoelectric cooling element (the Peltier for cooling the mirror surface). A proportional gain in the control parameter for the high dew-point region is set higher than a proportional gain in the control parameter for the low dew-point region, while integral time in the control parameter for the high dew-point region is set shorter than an integral time in the control parameter for the low dew-point region. <P>COPYRIGHT: (C)2012,JPO&INPIT |
