Vehicle Wiper Device Speed Control for Windshield Splatter Prevention
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Solution Overview
Problem
Vehicle wiper blades with a cleaning-liquid ejecting function tend to splatter cleaning liquid into the upper mid region of the windshield due to centrifugal force, causing it to remain and potentially obstruct image capturing devices located there, which can impair their functionality.
Innovation Solution
A vehicle wiper device with a first blade covering the upper mid region and a second blade covering the lower region, featuring a controller that adjusts the moving speed and cleaning liquid ejection amount of the second blade within a specified control region to prevent splattering into the upper mid region, particularly around image capturing devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the blade ejects cleaning liquid uniformly over a wide range of the windshield, then the cleaning liquid coverage is improved, but the cleaning liquid splatters into the upper mid region due to centrifugal force
Solution Approach 1:
The patent applies local quality by differentiating the ejection characteristics in different regions. The ejection amount is reduced when the blade is in the specific region (upper portion of the moving range) compared to other regions, thereby preventing excessive cleaning liquid from being ejected into the upper mid region while maintaining effective cleaning in other areas.
2Productivity
If the blade moves at normal speed, then the wiping efficiency is improved, but the cleaning liquid is pushed out to the upper mid region due to centrifugal force
Solution Approach 1:
The patent applies dynamics by making the blade moving speed variable rather than constant. The control unit reduces the moving speed when the blade is in the specific region (upper portion of the moving range) to minimize centrifugal force and prevent cleaning liquid from being pushed into the upper mid region, while maintaining higher speeds in other regions to preserve overall wiping efficiency.
3Illumination intensity
If the cleaning liquid remains in the upper mid region, then the visibility is improved temporarily, but the image capturing device function is adversely affected
Solution Approach 1:
The patent applies preliminary anti-action by taking preventive measures before the cleaning liquid can adversely affect the image capturing device. The control unit proactively reduces both the ejection amount and moving speed when the blade approaches the specific region (upper portion of the moving range), thereby preventing cleaning liquid from being pushed upward into the upper mid region where the image capturing device is located, rather than attempting to remove it after it has accumulated.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents cleaning liquid from remaining in the upper mid region of the windshield, ensuring clear visibility and maintaining the functionality of image capturing devices by reducing centrifugal force and ejection amount during specific blade movements.
Implementation Method 1
the cleaning liquid tends to splatter outward in the radial direction of the moving region of the blade due to the effect of a centrifugal force generated as a result of the movement of the blade
Data Source
Figure 1~2
Figure 3A~3C
Figure 4A~4C
AI summary
There is provided a vehicle wiper device. A vehicle wiper device 10 includes: a first blade 12 having an operating range that includes an upper mid region of a vehicle windshield 100; a second blade 14 having an operating range that includes a lower region of the operating range of the first blade 12; a blade driving unit that causes each blade to reciprocate; and a controller 20 that controls operation of the blade driving unit. When a tip end of the second blade moves in a special control region S that is oriented toward a specific region 18, the controller controls the blade driving unit such that a moving speed of the second blade is lower than a moving speed of the second blade when moving in another region.