Grounded Wiper Assembly for Fuel Sensor Electrostatic Dissipation
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Solution Overview
Problem
Existing fuel sensors in vehicles lack a grounded path to dissipate electrostatic charges from the fuel, which can lead to electrical issues and inaccurate fuel level readings.
Innovation Solution
A grounded wiper assembly is introduced, comprising a wiper housing with a float arm and float that moves relative to a variable resistor, and a conductor to bleed off electrical charges to ground, ensuring a grounded path for the float arm and fuel sensor circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional wiper assembly is used in the fuel sensor, then the fuel level sensing function is provided, but electrostatic charges from the fuel cannot be dissipated
Solution Approach 1:
The patent combines the wiper assembly with a conductor to create a grounded path. The conductor is integrated into the wiper assembly structure, merging the electrical charge dissipation function with the existing mechanical wiper components. This allows electrostatic charges to be bled off to ground through the conductor connected to the float arm, while maintaining the original fuel level sensing capability without adding separate complex grounding structures.
2Reliability
If the float arm is made conductive to provide grounding, then electrostatic charges can be dissipated, but the float arm may become susceptible to electrical interference
Solution Approach 1:
The patent extracts the grounding function from the float arm itself by using a separate conductor that connects to the float arm. The conductor serves as the primary path for charge dissipation, while the float arm remains primarily a mechanical linkage. This separation allows the grounding path to be provided without making the float arm itself conductive, thereby reducing its susceptibility to electrical interference while still achieving charge dissipation through the connected conductor.
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
The solution provides a reliable means to dissipate electrostatic charges, enhancing the accuracy of fuel level sensing and preventing electrical interference in the fuel sensor system.
Implementation Method 1
a conductor interconnecting the float arm and the wiper to bleed off electrical charges attached to fuel to ground
Data Source
AI summary
A grounded wiper assembly for a fuel sensor includes a wiper housing for rotation relative to a variable resistor and a wiper with at least one contact operatively supported by the wiper housing for contacting the variable resistor as the wiper housing rotates. The grounded wiper assembly includes a float arm connected to the wiper housing and a float connected to the float arm such that the float moves the float arm and the wiper housing relative to the variable resistor as a level of fuel increases and decreases in the fuel tank. The grounded wiper assembly further includes a conductor interconnecting the float arm and the wiper to bleed off electrical charges attached to fuel to ground.