Motor Vehicle Wiper Control Device Liquid Consumption
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Solution Overview
Problem
Conventional windshield washing devices for motor vehicles require a large amount of liquid for optimal cleaning, leading to inefficient liquid use and potential environmental impact.
Innovation Solution
A control device that manages the wetting agent's pump and wiper blade movement, allowing for variable liquid application based on predetermined lead times and positions, with selectable washing programs to optimize liquid use and prevent dry running.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wiper blade is activated simultaneously with the wetting agent, then the windshield is wetted continuously during wiping, but the liquid consumption is high
Solution Approach 1:
The wetting agent is applied to the windshield before the wiper blade starts moving. The control device activates the pump to deliver liquid through nozzles positioned at the wiper blade, ensuring the windshield surface is pre-wetted during a lead time period before wiping begins. This preliminary wetting allows the wiper to clean more effectively with less liquid needed during the actual wiping action.
2Reliability
If the wetting agent is applied continuously during wiper movement, then optimal cleaning is achieved, but the wash water tank size must be large
Solution Approach 1:
The wetting agent application occurs in periodic cycles rather than continuously. The control device activates the pump for specific time intervals (lead time and wetting time) within each wiping cycle, then deactivates it. This periodic application maintains cleaning effectiveness while significantly reducing overall liquid consumption, allowing for a smaller tank capacity.
3Speed
If the wiper blade starts immediately with switching element actuation, then response time is fast, but the wiper blade runs dry
Solution Approach 1:
When the switching element is actuated, the control device first activates the pump to apply wetting agent to the windshield through nozzles at the wiper blade during a lead time period. Only after this preliminary wetting is complete does the control device activate the wiper blade motor. This ensures the wiper blade starts its motion already saturated with liquid, preventing dry running while maintaining fast overall response.
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
Achieves optimal cleaning with significantly reduced liquid consumption, enabling a smaller washing water tank and potential CO2 savings while preventing wiper blade dryness.
Implementation Method 1
The wetting agent comprises a pump (22) and a nozzle (24)
Implementation Method 2
a wiper blade (16) movable across the windscreen of a motor vehicle
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a window cleaning device (10), in particular for a motor vehicle. Said device comprises a switching element (12), a wiper blade (16) that can be moved across a window (14) and a wetting agent (18) for applying a liquid onto a window (14) of the motor vehicle. According to the invention, a control device (20) controls the wetting agent (18).