Vehicle Wiper Offset Strategy Prevents Dirt Re-deposition
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Solution Overview
Problem
Conventional window wiping and washing systems for vehicles often leave dirt behind due to wiper blades carrying polluted washing liquid back to dirty zones, especially when washing liquid is projected from only one side, leading to incomplete cleaning and re-deposition of dirt on the windshield.
Innovation Solution
A method and system where the wiper blade's starting position is offset between wiping cycles to avoid contact with previously dirty zones, ensuring the wiper blade does not re-deposit dirt, and the washing liquid is projected during specific cycles to maintain cleanliness, with electronic control for precise movement and liquid actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If washing liquid is projected from only one side of the wiper blade member, then the device complexity is reduced, but the cleaning quality deteriorates because one face of the wiper blade is not directly cleaned by the liquid
Solution Approach 1:
The invention applies preliminary action by offsetting the starting position of the wiper blade member in alternating wiping cycles. Before the blade returns to its original starting position, it is deliberately shifted to a different position, ensuring that the zone where it previously deposited dirty liquid is avoided during the return stroke. This preliminary positional adjustment prevents re-contamination and maintains cleaning quality without requiring liquid projection from both sides.
2Ease of operation
If the wiper blade member returns to the same starting position after each back and forth movement, then the ease of operation is maintained, but the cleaning quality deteriorates because the blade carries and re-deposits polluted washing liquid on the same zone
Solution Approach 1:
The invention applies dynamics by making the starting position of the wiper blade member variable rather than fixed. The control device dynamically adjusts the starting position between alternating wiping cycles, shifting it to different locations on the window surface. This dynamic position change ensures that the blade does not repeatedly contact the same contaminated zone, preventing re-deposition of dirt while maintaining operational simplicity through automated control.
3Productivity
If the wiper blade member carries washing liquid over the entire wiping zone, then the productivity of cleaning is improved, but the object-generated harmful factors increase because dust mixed with the liquid is deposited at the starting position
Solution Approach 1:
The invention applies preliminary action by proactively offsetting the starting position before the wiper blade completes its return stroke. This preliminary positional shift ensures that even though the blade carries washing liquid and dust over the entire wiping zone during its stroke, the contaminated starting zone is avoided on the return journey. The dust-laden liquid is thus deposited in a different zone than where the blade will next start, preventing re-contamination while maintaining full cleaning coverage.
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
This method improves the efficiency of window cleaning by preventing dirt re-deposition and maintaining a cleaner windshield, particularly when washing liquid is not projected from both sides of the wiper blade, enhancing visibility for the driver.
Implementation Method 1
the projections means are actuated at least during the first step in order to project washing liquid in front of the wiper blade member relative to its movement direction
Implementation Method 2
one or two wiper blade members which are driven by an arm in a back and forth movement on the windscreen. These blade members carry wiper blades which are produced from a resilient material and which rub against the windscreen
Data Source
AI summary
A method for washing a window of a vehicle, using at least one wiper blade member and a liquid projector that projects liquid for washing the window onto a wiping surface has a first wiping cycle including a first step of actuating the wiper blade member to move over the window in a first direction from a first starting position to a wiping end position, while projecting the liquid onto the wiping surface, and a second step of actuating the wiper blade member to move over the window in a second direction opposite the first direction from the wiping end position to the first starting position, and a second wiping cycle including a third step of actuating the wiper blade member to move over the window in the first direction from the first starting position to the wiping end position, while projecting the liquid onto the wiping surface.