Patent ID: 8405336

Claim:
A wiper system comprising: a wiper that is pivotably supported to swing over a wiping subject surface and thereby to wipe the wiping subject surface; an electric motor that has an output shaft, which is connected to the wiper to transmit a rotational force of the electric motor to the wiper, wherein the electric motor drives the wiper to execute a reciprocal swing operation of the wiper between an upper return position and a lower return position upon forward and backward rotations of the output shaft; an entering means for entering one of a plurality of operational commands of the wiper to execute a corresponding one of a plurality of operational modes of the wiper that are preset to implement different moving speeds, respectively, of the wiper; and a control means for controlling the electric motor, wherein when one of the plurality of operational commands, which commands execution of one of the plurality of operational modes, is entered through the entering means in the middle of the operation of the wiper in another one of the plurality of operational modes, the control means controls the electric motor to progressively and incrementally change the moving speed of the wiper, from a preset moving speed for the another one of the plurality of operational modes to a preset moving speed for the one of the plurality of operational modes, based on a difference between the preset moving speeds for the one and the another of the plurality of operational modes divided by a predetermined number of swings of the wiper between the upper return position and the lower return position, and within a time period for executing the predetermined number of swings.