Denso Corporation

Yuta Doi

Hidenobu Suzuki

A wiper control device that properly detects restriction of a wiper blade according to a travel distance of the wiper blade. When a state in which a rotation speed of an output shaft calculated from a rotation angle of the output shaft detected by a rotation angle sensor is equal to or slower than a speed threshold defined according to a travel distance of the wiper blade and in which a current detected by a current detector is equal to or larger than a current threshold continues for a predetermined determination period, a microcomputer stops a wiper motor or reverses a direction of a wiping action of the wiper blade.

Wiper control device

A wiper motor control circuit carries out control in which a driving circuit generates, and supplies to a wiper motor, a voltage that eliminates deviation between a target speed and an actual speed of an output shaft. In a case in which a state in which the deviation between the target speed and the actual speed is greater than or equal to a predetermined threshold value continues for a predetermined time or more, the wiper motor control circuit carries out control that lowers the target speed and in which the driving circuit generates, and supplies to the wiper motor, a voltage that eliminates deviation between the lowered target speed and the actual speed of the output shaft.

Wiper device

A wiper control device that includes: a current detection section that detects a flow of current through a coil of a wiper motor; an environmental information acquisition section that acquires a vehicle speed or a vehicle external air temperature as environmental information; and a control section that controls a drive circuit such that a torque of an output shaft that is estimated from the current detected by the current detection section becomes equal to or less than a base limit torque that corresponds to a rotation angle detected by a rotation angle detection section, and such that a torque of the output shaft becomes equal to or less than a base limit torque that is corrected according to environmental information acquired by the environmental information acquisition section.

Growing community of inventors

Kariya, Japan

Yuta Doi