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Apparatus and a method for controlling wiper

  • US 4,710,878 A
  • Filed: 12/30/1985
  • Issued: 12/01/1987
  • Est. Priority Date: 04/11/1985
  • Status: Expired due to Fees
First Claim
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1. An apparatus for controlling a wiper comprising:

  • a detecting means for detecting an amount of rain positioned thereon, said detecting means outputting a detected rain signal, the detected rain signal corresponding to the detected amount of rain positioned on said detecting means after the wiper wipes out water deposited on said detecting means;

    a first comparator means for comparing the detected rain signal with a first predetermined signal, the first predetermined signal corresponding to a first predetermined amount of drops of water, said first comparator means determining if the detected amount of rain is equal to or greater than the first predetermined amount of drops of water, wherein when said first comparator means determines the detected amount of rain is equal to or greater than the first predetermined amount of drops of water, said first comparator means outputs a first output signal;

    an actuator means for actuating the wiper in accordance with receipt of the first output signal so that when said actuator means receives the first output signal, said actuator means produces an actuating output signal and actuates the wiper at a first wiping speed;

    a second comparator means for comparing the detected rain signal with a second predetermined signal, the second predetermined signal corresponding to a second predetermined amount of drops of water, said second comparator means determining if the detected amount of rain is equal to or greater than the second predetermined amount of drops of water, wherein when said second comparator means determines the detected amount of rain is equal to or greater than the second predetermined amount of drops of water, said second comparator means produces a second output signal;

    a timer means for receiving the actuating output signal outputted from the actuator means, and for producing a first clock signal when the wiper returns to an initial position, the first clock signal having a first time period, said timer means receiving a change output signal, and producing a second clock signal having a second time period;

    a memory means for receiving said second output signal and the first and second clock signals and for memorizing said second output signal, said memory means reproducing said memorized second output signal during the first time period after the wiper wipes out the water deposited onsaid detecting means in accordance with receipt of the first clock signal, said memory means reproducing said memorized second output signal during the second time period after the wiper wipes out the water deposited on said detecting means in accordance with receipt of the second clock signal; and

    a changing means for receiving the memorized second output signal and for producing the change output signal for changing the wiping speed of the wiper at a time when the wiper returns to the initial position thereof in accordance with receipt of the memorized second output signal reproduced from the memory means.

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