Fuel Level Sensor Using Dual Resistive Elements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Modern fuel tank shapes and dynamic conditions complicate accurate fuel level indication, leading to unreliable fuel quantity information, especially on inclined roads and during vehicle maneuvers.
Innovation Solution
A system using two resistive elements within the fuel tank, one with a variable resistance and one with a fixed resistance, both responding to electrical current and fuel presence, coupled with a microprocessor to determine the fuel level based on resistance changes and predetermined lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional fuel level sensors are used in irregularly shaped tanks, then the indication of fuel level is provided, but the conversion into reliable indication of fuel quantity becomes difficult
Solution Approach 1:
The patent replaces traditional mechanical float-based level sensors with an electrical resistance measurement system. Two resistive elements are used: one whose resistance varies with fuel level (first resistive element) and one with fixed resistance (second resistive element). The microprocessor calculates fuel quantity by comparing the variable resistance to the fixed resistance, eliminating mechanical components and improving reliability in irregular tank shapes.
Solution Approach 2:
The patent changes the measurement parameter from direct mechanical level indication to electrical resistance comparison. By measuring the resistance of the first resistive element relative to the second resistive element, and using the known lengths of both elements, the system calculates fuel quantity as a ratio, which compensates for irregular tank geometry and improves measurement reliability.
2Reliability
If mechanical damping means are used to filter oscillations, then rapid dynamic variations are attenuated, but the system complexity increases
Solution Approach 1:
The patent eliminates mechanical damping mechanisms by using electrical resistance measurement combined with microprocessor-based signal processing. The system filters dynamic variations through computational algorithms that distinguish between actual fuel quantity changes and oscillations caused by vehicle maneuvers, maintaining stability without mechanical moving parts.
Solution Approach 2:
The system uses the electrical properties of the resistive elements themselves to provide both measurement and filtering functions. The resistance measurements naturally smooth out rapid variations, and the microprocessor further processes the signals to eliminate noise, allowing the system to self-regulate without external mechanical damping components.
3Ease of operation
If moving parts are included in the fuel level indication system, then mechanical level detection is achieved, but reliability problems and complexity increase
Solution Approach 1:
The patent completely replaces mechanical level detection systems with an electrical resistance-based measurement system. The resistive elements are stationary components that change electrical properties based on fuel contact, eliminating all moving parts such as floats, linkages, and mechanical switches, thereby dramatically improving system reliability while maintaining detection capability.
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
Provides a reliable and simple method to accurately determine the fuel level in a fuel tank, filtering out dynamic variations and ensuring precise fuel quantity information.
Implementation Method 1
The first resistive element generates a variable resistance in response to both electrical current and the fuel passing therethrough
Implementation Method 2
The second resistive element generates a fixed resistance in response to both the electrical current and the fuel passing therethrough
Data Source
AI summary
A method and system for determining the level of fuel contained in the tank of a motor vehicle includes a first resistive element disposed in the tank and having a first predetermined length. The first resistive element generates a variable resistance in response to electrical current and fuel passing therethrough. A second resistive element is also disposed in the tank and has a second predetermined length. The second resistive element generates a fixed resistance in response to the electrical current and fuel passing therethrough. A microprocessor coupled to the first and second resistive elements determines the level of fuel contained in the tank based on the variable resistance, the fixed resistance and the first and second predetermined lengths.