| 摘要 |
In an opposed wiping type wiper apparatus, left and right wiper blades which perform wiping operations with a predetermined preceding-following relationship maintained are layered vertically at their lower returning positions. A wiper drive control unit controls preceding-following relationships between the left and right wiper blades to prevent locking and stopping of the wiper blades when the relationship has changed by replacing left and right control forms for the blades. When the timer of the wiper blade which is to be in the follower side during normal operation is not reset but overflows among timers which are respectively reset pulse signals generated in accordance with rotations of motors, the output of the motor which drives the wiper blade which is to be in the follower side during normal operations is increased. In this manner, the wiper blades are prevented from being locked even in case where the preceding-following relationship between the wiper blades is changed without causing changes of position angles. The control unit also acts to operate both preceding and following wiper blades if the preceding side stops for a predetermined time or more within a common overlap region. Thus, the outputs from two motors is applied to the wiper blades to overcome a load applied to the wiper blades.
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