| 摘要 |
<p>PURPOSE:To acquire a wind speed detection device of an automobile air conditioner which is cheap and high in detection precision of wind speed in a simple structure and without using any special parts by constituting it so that power supply for heating to a heating side heat sensitive element is intermittently carried out. CONSTITUTION:A wind speed detection device is constituted of a pair of thermistors 1, 2 for speed detection and their control circuit 6. At this time, the thermistor 1 is for temperature detection and the thermistor 2 for being heated. Additionally, the control circuit 6 is provided with a one chip microcomputer 3 to carry out arithmetical process by way if reading signal from each of the thermistors 1, 2, resistors R1-R4 constituting a wind speed sensor circuit with each of the thermistors 1, 2 and a transistor Q1 to carry out ON/OFF motion of the circuit. Then, when the transistor Q1 is switched ON by the microcomputer 3, heating power is supplied to the thermistor 2. Conversely, when the transistor Q1 is switched OFF, temperature signal voltage of the thermistor 2 is generated, and it is possible to read out temperature of the thermistor 2.</p> |
