Precipitation detector for arrangements which control windshield wipers and/or washers, and the like
Piezo-electric seed-flow monitor
Automatic windshield wiper speed control with piezoelectric sensor
Rain condition dependent wiper control system for an automotive vehicle Patent #: 4542325
ApplicationNo. 06/574142 filed on 01/26/1984
US Classes:340/602, Moisture or humidity (e.g., rain)15/250.02, Coordinated operation of cleaner and applying means310/324, Diaphragm310/345, Supported by elastic material73/170.17Precipitation (e.g., rain gauge)
ExaminersPrimary: Rowland, James L.
Assistant: Myer, Daniel
Attorney, Agent or Firm
International ClassB60S 1/08 (20060101)
Foreign Application Priority Data1983-01-28 JP
AbstractA wiper control system controls an automotive wiper in accordance with rain conditions. Rain conditions are detected by means of a rain sensor which has a vibrator adapted to vibrate at an amplitude corresponding to rain conditions. The vibrator is adapted to produce a sensor signal having an amplitude corresponding to its vibration. The vibrator vibrates at a resonant frequency outside of the audible frequency range and has adequate sensitivity for detecting rain conditions.