Patent ID: 6028407
Filing Date: 2000-02-22
Classification: B60S

Abstract:
A wiper control device for controlling a wiper apparatus of a vehicle comprising;a motor provided with a first and a second terminal, and a shaft connected to the wiper apparatus and rotatable in forward and reverse directions;A wiper switch for generating an on-signal or an off-signal;a position switch provided with a rotating disc connected with the shaft of said motor, a first and a second metallic contact plate disposed on said rotating disc and connected with each other, a first contactor disposed slidably on said rotating disc for generating a first turning signal according to electric contact with said first contact plate, and a second contactor disposed slidably on said rotating disc for generating a second turning signal according to electric contact with said second contact plate;a first relay having a first relay coil and a first relay contact connected to the first terminal of said motor for supplying an electric current to said motor in a forward rotational direction;a second relay having a second relay coil and a second relay contact connected to the second terminal of said motor for supplying an electric current to said motor in a reverse rotational direction;a first drive circuit connected to said first relay coil for supplying an electric current to said first relay coil;a second drive circuit connected to said second relay coil for supplying an electric current to said second relay coil;a first position detecting circuit connected to said first drive circuit and the first contactor of said position switch for detecting the first turning signal and interrupting the electric current supplied to said first relay coil from said first drive circuit;a second position detecting circuit connected to said second drive circuit and the second contactor of said position switch for detecting the second turning signal and interrupting the electric current supplied to said second relay coil from said second drive circuit;a first delaying circuit connected to said wiper switch and a node between said second relay coil and said second drive circuit, and further connected to said first drive circuit for supplying a signal generated by said second drive circuit or said wiper switch to said first drive circuit after delaying the timing for a predetermined time;a second delaying circuit connected to a node between said first relay coil an said first drive circuit for supplying a signal generated by said first drive circuit to said second drive circuit after delaying the timing for a predetermined time; anda holding circuit connected to said first drive circuit and a node between said first relay coil and said first drive circuit for supplying a self holding signal to said first drive circuit.