| 摘要 |
<p>A windshield wiper system and method comprising a controller which cooperates with a single sensor (30) positioned in fixed relationship to a target (32) situated on an armature (22) of a drive motor (20) which is driven in response to the controller. The wiper motor (20) is a reversing wiper motor and changes direction in response to a change of polarity of drive signal generated by controller. An interrupt (34) is situated on a drive train (24) driven by the armature (22) of the wiper motor (20) and moves in correlation to the movement of a wiper blade. The sensor (30) generates a pulse train associated with the movement of the wiper blade, and this pulse train gets interrupted by the interrupt (34) when the wiper blade reaches a reversing position, such as an inwipe or an outwipe position. The interruption thereby gives controller an indication of when to reverse the polarity of the drive signal used to drive the wiper motor (20). The controller also uses the polarity of the drive signal to determine direction and, when used in combination with the sensor signal pulse train, to determine the velocity and position of the wiper blade. This, in turn, enables controller to control the velocity and direction of the wiper blades.</p> |
