Vehicle Windshield Washer Pump Timing Control
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Solution Overview
Problem
Existing window washing systems for vehicles waste liquids by continuously ejecting them during wiping phases, leading to inefficient use and excess consumption of cleaning and defrosting fluids.
Innovation Solution
A method that optimizes liquid consumption by ejecting fluids only during specific phases of the wiper blade's motion, using a pump system to purge and fill the pipe system with the correct fluid at the right time, and activating the pump only when the wiper blade is in specific positions to ensure targeted fluid distribution and minimize waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump system continuously ejects liquid during the entire wiper blade sweeping phase, then the windshield surface is continuously covered with cleaning liquid, but excessive liquid is wasted and consumption increases
Solution Approach 1:
The pump system activates the liquid ejection before the wiper blade reaches the position where liquid is needed, and deactivates it when the blade reaches an intermediate position. This preliminary action ensures the liquid is applied at the optimal moment during the sweeping phase, preventing waste while maintaining cleaning effectiveness.
Solution Approach 2:
Instead of continuous liquid ejection throughout the entire sweeping phase, the system uses periodic action by activating the pump only during specific intervals - from the low position to an intermediate position, or from an intermediate position to another intermediate position. This periodic ejection reduces liquid consumption while ensuring adequate coverage during critical cleaning phases.
2Adaptability or versatility
If the pump system switches between multiple tanks with different liquids, then superior cleaning and defrosting functions are achieved, but liquid waste increases due to timing mismatches
Solution Approach 1:
The system switches between tanks and activates the pump in advance of when the liquid is actually needed during the wiper blade's motion. This preliminary activation ensures the correct liquid is ejected at the optimal moment, preventing waste that would occur from delayed or mistimed ejection during pump switching operations.
Solution Approach 2:
The system dynamically adjusts the pump activation timing based on the wiper blade's position and the required liquid type. By making the pump operation conditional and time-dependent rather than continuous, the system adapts to the specific cleaning or defrosting needs while minimizing liquid waste during transitions between different liquid types.
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 reduces liquid waste and improves cleaning efficiency by ensuring the right fluid is used at the right time and place, optimizing the use of both cleaning and defrosting fluids.
Implementation Method 1
a pump system intended to circulate the fluid in the pipe system up to ejection through the aforementioned orifices
Implementation Method 2
at least one wiper blade capable of moving on the windshield
Data Source
Figure 1~2
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AI summary
The invention relates to a method for washing a windshield of a motor vehicle, by using a washing device including vessels of the first and second fluids, a duct connecting the vessels to openings for ejecting the fluids onto the windshield, at least one pump used to cause the fluids to flow into the duct, and at least one wiper blade, method which is characterized in that it includes, for example, a step of driving the wiper blade from a low position to a high position, and of activating the pump system such that the first fluid is ejected onto the windshield only between the time when the blade is in the low position thereof and the time when the blade is in an intermediate position, or only between the time when the blade is in an intermediate position and the time when the blade is in the high position thereof, or only between the time when the blade is in an intermediate position and the time when the blade is in another intermediate position.