Patent ID: 7895701
Filing Date: 2011-03-01
Classification: B60S,Y10S

Abstract:
1. An opposite type wiper apparatus having a first wiper blade on an upper side, and a second wiper blade on a lower side, the first and the second wiper blades being disposed so as to overlap in a center portion of a windshield, each of the first and second wiper blades being moved between a lower reversal position and an upper reversal position of the windshield from a storage position by turning on an operation switch, and performing a reciprocating wiping motion between the lower reversal position and the upper reversal position, the apparatus comprising: a first driving force transmission mechanism transmitting a driving force to the first wiper blade; a first motor having a first output shaft which drives the first driving force transmission mechanism, and a first rotation shaft rotatably driving the first output shaft; a first signal output means being provided to the first motor, and outputting a motor driving signal sent from the first motor; a first control unit being inputted an output signal from the first signal output means, and rotatably controlling the first motor based on the output signal; a first reference position data memory section being provided to the first control unit, and memorizing reference position data of the first wiper blade with respect to the windshield; a first true position data calculation section being provided to the first control unit, and calculating true position data of the first wiper blade with respect to the windshield, the true position data being obtained based on the output signal; a first operation angle range calculation section being provided to the first control unit, and calculating an operation angle range of the first motor based on the true position data and the reference position data; a first abnormal condition judging section judging an abnormal condition of the first reference position memory section; a second driving force transmission mechanism transmitting a driving force to the second wiper blade; a second motor having a second output shaft driving the second driving force transmission mechanism, and a second rotating shaft rotatably driving the second output shaft; a second signal output means being provided to the second motor, and outputting a motor driving signal sent from the second motor; a second control unit being inputted an output signal from the second signal output means, and rotatably controlling the second motor based on the output signal; a second reference position data memory section being provided to the second control unit, and memorizing a reference position data of the second wiper blade with respect to the windshield; a second true position data calculation section being provided to the second control unit, and calculating a true position data of the second wiper blade with respect to the windshield, the true position data being obtained based on the output signal; a second operation angle range calculation section being provided to the second control unit, and calculating an operation angle range of the second motor, based on the true position data and the reference position data; a second abnormal condition judging section judging an abnormal condition of the second reference position data memory section; and a communication line being connected between the first control unit and the second control unit, and exchanges control data between the respective control units, wherein the first and the second operation angle range calculation sections correct the operation angle ranges of the first and the second motors so as to shift the upper and lower reversal positions toward the storage position, when at least one of the first and the second abnormal condition judging sections gives an “abnormal” judgment, and so as to make a correction amount of the second operation angle range calculation section larger than a correction amount of the first operation angle range calculation section.