Wiper control device

A wiper control device comprising:

• a wiper element to rotate a wiper motor by being turned on, to drive a wiper that reciprocates between a first position and a second position;
• a drive unit configured to control on/off of the wiper element;
• an acquisition unit configured to acquire a value related to a current flowing through the wiper motor;
• an estimation unit configured to estimate a wiper angle that is a rotation angle of the wiper based on a current ripple of the current having a periodicity corresponding to drive of the wiper motor;
• and
• a calculation unit configured to calculate a deceleration start angle based on a ripple period that is a period of the current ripple, the deceleration start angle being the wiper angle at which deceleration of the wiper is started before a position of the wiper reaches the first position and the second position, wherein
• the drive unit is configured to
• decelerate the wiper by switching the wiper element from on to off to stop power supply from the wiper element to the wiper motor when the wiper angle reaches the deceleration start angle, and
• resume the power supply from the wiper element to the wiper motor by switching the wiper element from off to on when a position of the wiper is one of the first position, a position earlier than the first position, the second position, and a position earlier than the second position after the wiper angle reaches the deceleration start angle.