Bidirectional Wiper Pump Control via Cam-Generated Signals
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Solution Overview
Problem
Existing window-washing systems require separate pumps and electrical control circuits for the windshield and rear window, making them complex and costly.
Innovation Solution
A simplified system using a single bidirectional pump and electrical control signals generated by a cam linked to the drive motor, allowing the pump to alternate between delivering jets to the windshield and rear window based on the angular position of the wiper arm, with a switch and selective electrical components to manage the pump's direction and power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate pumps and electrical control circuits are used for windshield and rear window washing, then each window can be washed independently, but the system complexity and cost increase
Solution Approach 1:
The patent combines two separate washing systems (windshield and rear window) into a single integrated system using one pump and one electrical control circuit. The pump is connected to multiple nozzles through fluid distribution manifolds, allowing a single pump to supply washing liquid to both the windshield nozzles and rear window nozzles simultaneously or alternately, thereby reducing system complexity while maintaining independent washing capability.
Solution Approach 2:
The single pump is designed to perform multiple functions by serving both the windshield washing system and the rear window washing system. The pump can operate in different modes to deliver washing liquid to different sets of nozzles based on the washing requirements, making the pump a multi-functional component that replaces what would traditionally require two separate pumps.
2Device complexity
If a single pump is used for both windshield and rear window, then system complexity and cost are reduced, but control precision and reliability may worsen
Solution Approach 1:
The patent segments the washing system into distinct fluid distribution circuits: one circuit for the windshield nozzles and another circuit for the rear window nozzles. Although these circuits share a common pump, each circuit has its own control valves and flow regulation mechanisms, allowing independent control of washing liquid delivery to each window. This segmentation ensures that a malfunction in one circuit does not affect the other, maintaining system reliability.
Solution Approach 2:
The patent introduces intermediary components such as control valves, flow regulators, and fluid distribution manifolds between the single pump and the multiple nozzle groups. These intermediaries act as mediators that precisely control the flow of washing liquid to different destinations, ensuring reliable and accurate delivery despite the shared pump source. The electrical control circuit also serves as an intermediary that coordinates pump operation and valve actuation to maintain washing reliability.
Data Source
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AI summary
The invention relates to a wiper system (1) for wiping a glazed surface of a motor vehicle having a washer system (3) able to be used in combination with a reservoir (5) containing a washer fluid, said wiper system comprising - a drive motor (7) for driving at least one wiper arm, - a pump (11) intended to be fluidly connected firstly to said reservoir (5) and secondly to at least two spray nozzles at least one of which is able to deliver a jet of fluid to the windshield of a vehicle and at least another of which is able to deliver a jet of fluid to the rear screen of a vehicle, and - a switch (17) having at least a first position for supplying said at least one spray nozzle able to deliver a jet of fluid to the windshield and a second position for supplying said at least one spray nozzle able to deliver a jet of fluid to the rear screen, - the pump (11) being a two-way pump capable of being driven in two opposite directions of rotation to supply one or other of the spray nozzles under the control of said switch (17), characterized in that means (9) for generating electrical control signals which are connected to the drive motor (7) are able to generate electrical control signals that vary according to the angular position of the wiper arm on the glazed surface and in that said two-way pump is supplied when the switch (17) is in the first position via the means (9) of generating electrical control signals which are connected to the drive motor (7) according to the angular position of the wiper arm on the glazed surface.