Wiper Control System Preventing Intermediate Stops
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Solution Overview
Problem
Conventional wiper systems often intermittently stop in the middle of the windshield glass during the spraying of mist or washer fluid, blocking the driver's and passenger's view, due to inadequate automatic-stop mechanisms.
Innovation Solution
A wiper control system and method that includes a multifunction switch, a body control module, and a wiper motor, which detect the parking end of the wiper and adjust the wiper relay's operation to ensure the wiper returns to the correct position at the bottom of the windshield glass, using a cam plate rotation angle of about 30 degrees and CAN communications to prevent intermediate stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the wiper uses an automatic-stop mechanism during mist or washer fluid spraying, then the wiper can operate automatically, but the wiper may intermittently stop in the middle of the windshield glass blocking the driver's and passenger's view
Solution Approach 1:
The control module continuously monitors the wiper's position during automatic operation and compares it with the desired parking position. When the wiper is detected to be in the middle of the windshield glass, the system automatically extends the operation time to ensure the wiper reaches the correct parking position at the bottom, preventing intermediate stops that would block visibility.
Solution Approach 2:
The system detects the wiper's stop position in advance during the spraying operation and proactively adjusts the operation duration before the wiper completes its cycle. By detecting potential intermediate stopping conditions early, the control module extends the operation time preemptively to ensure the wiper reaches the proper parking position, avoiding blocking the windshield.
2Reliability
If the wiper operation time is extended to prevent intermediate stops, then the wiper positioning accuracy improves, but the operation time increases
Solution Approach 1:
The system applies partial extension of operation time only when necessary. The control module monitors the wiper's stop position and extends the operation duration by a specific amount (e.g., 0.7 seconds for mist, 0.7 to 3.2 seconds for washer fluid) only when intermediate stopping is detected, rather than continuously extending operation time in all cases. This selective approach minimizes overall time loss while ensuring positioning accuracy when needed.
Data Source
AI summary
A wiper control system includes: a multifunction switch detecting and transmitting an operation of a wiper provided on a vehicle; a body control module controlling a wiper relay through a data signal of the multifunction switch; and a wiper motor connected to the multifunction switch and the body control module and connected to the wiper to rotate the wiper according to rotation of a cam plate of the multifunction switch and detect a parking end of the body control module, thereby preventing the wiper from being positioned in a middle of a windshield glass.