Variable Resistance Heating Resistor for Fuel Identification
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Solution Overview
Problem
Existing fuel identification systems for flex-fuel vehicles are complex and costly, requiring temperature control mechanisms and separate devices for heating and composition analysis, and cannot simultaneously identify fuel blends, phases, or air presence in the fuel line.
Innovation Solution
A fuel identification system using a variable resistance heating resistor connected to a power source and an electronic control unit that measures current and voltage to determine fuel composition, ethanol/gasoline ratio, and physical phase without a temperature compensating mechanism, utilizing precalculated tables based on the formula U×I=k×A×(Tq−Tf) to identify fuel properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature compensating resistor and constant temperature control mechanism are used to maintain heating resistor temperature, then measurement precision is improved, but device complexity increases and cost increases
Solution Approach 1:
The heating resistor serves dual functions: it heats the fuel and simultaneously acts as a sensor whose resistance variation directly indicates fuel composition. The system uses the resistor's own electrical characteristics (resistance and current) as the measurement parameter, eliminating the need for separate temperature compensation mechanisms or additional sensors.
Solution Approach 2:
The system measures fuel composition by detecting changes in the electrical parameters (resistance and current) of the heating resistor, which vary according to the fuel's thermal conductivity and composition. This parameter substitution approach replaces complex temperature control and measurement with simpler electrical parameter monitoring.
2Measurement precision
If separate devices are used for heating fuel and analyzing composition, then measurement precision is improved, but device complexity increases and cost increases
Solution Approach 1:
The heating resistor and composition sensor are merged into a single component. The same resistor that heats the fuel also serves as the sensing element, with its electrical characteristics providing information about fuel composition. This integration eliminates the need for separate heating elements and sensors.
Solution Approach 2:
The heating resistor performs multiple functions simultaneously: it heats the fuel to the required temperature and acts as a sensor whose resistance and current characteristics indicate the fuel's composition and properties. This multi-functionality reduces the total number of components in the system.
3Measurement precision
If complex calculations including second-order functions are performed to determine fuel mixing ratio, then measurement precision is improved, but processing time increases and device complexity increases
Solution Approach 1:
The system replaces complex mathematical calculations with direct electrical measurement and lookup table comparison. Instead of performing second-order function calculations, the microcontroller measures the resistor's current and resistance, then identifies fuel composition by comparing these values against pre-stored reference data, significantly reducing computational complexity.
4Measurement precision
If additional devices are added to identify fuel composition, then measurement precision is improved, but device complexity increases and cost increases
Solution Approach 1:
The heating resistor and composition sensor are merged into a single component. The same resistor that heats the fuel also serves as the sensing element, with its electrical characteristics providing information about fuel composition. This integration eliminates the need for separate heating elements and sensors.
Solution Approach 2:
The heating resistor performs multiple functions simultaneously: it heats the fuel to the required temperature and acts as a sensor whose resistance and current characteristics indicate the fuel's composition and properties. This multi-functionality reduces the total number of components in the system.
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 system simplifies fuel identification by using a single device for heating and analysis, reducing costs and complexity, while accurately determining fuel composition, phase, and air presence, eliminating the need for additional sensors and complex calculations.
Implementation Method 1
a voltage pulse is applied to a heater during a predetermined time, so that the gasoline to be identified is heated by the heater
Implementation Method 2
A temperature sensor is arranged in the vicinity of the heater to identify the fuel temperature
Implementation Method 3
The fuel is fed between the electrodes of the alcohol-in-gas concentration sensor. This concentration is measured based on the fuel inductive capacity between the electrodes when an oscillation frequency is applied
Data Source
AI summary
The present invention relates to a fuel identification system and method normally applied to internal combustion engine vehicles of the flex-fuel type by means of which it is possible to identify the composition of the fuel used at each point in time, particularly the ratio used in a gasoline/ethanol blend or detect the presence of air or fuel in the vapor state in the fuel line, using the same device that heats the fuel. The system according to the invention comprises a heating resistor (3) having a variable resistance value as a function of its temperature, said resistor being arranged in contact with the fuel (2); a current measuring device (6), which measures the current through the variable resistor (3); and an electronic control unit (4) connected to the resistor (3) and connected to the current measuring device (6), receiving from it the measured resistor (3) current values, the electronic control unit (4) comprising data processing means to help identify fuel (2) properties based on the current in resistor (3).