Patent ID: 7586275
Filing Date: 2009-09-08
Classification: B60S,H02K

Abstract:
1. A method for controlling a wiper device, driving a wiper arm by means of a motor to reciprocate between an upper reversal position and a lower reversal position for a wiping operation and controlling the operation of the wiper device by detecting the wiper arm position by means of the count value of the pulse signal output as a result of the rotary motion of the motor, wherein a reference position for resetting the count value of the pulse signal to a reference value, arranged between the upper reversal position and the lower reversal position; a stored position for holding the wiper arm at rest when the wiper arm is stopped, arranged below the lower reversal position; a lower limit position for mechanically restricting the operation of the wiper arm and causing the count value of the pulse signal to show a predetermined value, arranged below the stored position; and, when the wiper arm stops in operation between the upper reversal position and the reference position, it is always started to move toward the reference position at the time of restarting and the count value of the pulse signal is reset to the reference value as the wiper arm passes the reference position; when the wiper arm stops in operation between the reference position and the stored position, it is started either toward the reference position or the lower limit position at the time of restarting and the count value of the pulse signal is reset to the reference value or the predetermined value as the wiper arm passes the reference position or arrives at the lower limit position, whichever appropriate.