Fuel Sonic Speed Estimation via Pressure Oscillation Frequency
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Solution Overview
Problem
Conventional methods for monitoring fuel mass and properties in internal combustion engines are inadequate, particularly when dealing with varying fuel blends and temperatures, leading to increased complexity, cost, and maintenance due to the need for multiple sensors and failure to account for fuel characteristics.
Innovation Solution
A diagnostic system that includes a pressure sensor and a determiner to estimate sonic speed based on the identification of fundamental oscillation frequencies, allowing for the calculation of fuel mass and properties using equations that relate sonic speed to fuel density and pressure, thereby simplifying the monitoring process and reducing the need for multiple sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods use multiple sensors to monitor fuel mass and properties, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple measurement functions (fuel mass monitoring, sonic speed measurement, temperature compensation) into a single integrated system that uses one pressure sensor to capture all necessary data. The pressure sensor signal contains multiple frequency components that can be analyzed to extract both fuel mass information and sonic speed characteristics, eliminating the need for separate sensors for each measurement.
Solution Approach 2:
The single pressure sensor serves multiple functions: measuring fuel mass, determining sonic speed through frequency analysis, and providing temperature compensation data. The system processes the pressure sensor output to extract multiple parameters (fundamental frequency, higher frequency components) that correspond to different fuel properties, making the single sensor a multi-functional measurement device.
2Measurement precision
If conventional methods use multiple sensors to account for fuel characteristics, then measurement precision is improved, but cost increases
Solution Approach 1:
The patent merges the functions of multiple expensive specialized sensors into a single pressure sensor combined with signal processing capability. By analyzing the frequency spectrum of the pressure sensor output, the system can determine sonic speed, fuel mass, and temperature effects without requiring separate temperature sensors, sonic speed sensors, or fuel composition sensors.
Solution Approach 2:
The patent replaces physical sensor hardware with signal processing methods. Instead of using separate mechanical or electronic sensors for temperature and sonic speed measurement, the system uses digital signal processing to extract these parameters from the pressure sensor's frequency response, substituting computational methods for additional physical sensing components.
3Device complexity
If conventional methods monitor fuel mass without accounting for temperature, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The system uses feedback from the pressure sensor signal itself to compensate for temperature effects. By continuously analyzing the frequency spectrum and identifying the fundamental frequency and higher frequency components, the system can determine sonic speed variations caused by temperature changes and adjust the fuel mass calculation accordingly, creating a self-compensating measurement system.
Solution Approach 2:
The patent utilizes periodic oscillations in the pressure sensor signal at different frequencies (fundamental frequency and higher frequency components) to extract multiple pieces of information. The periodic nature of these oscillations allows the system to measure both the amplitude (related to fuel mass) and frequency characteristics (related to sonic speed and temperature), enabling temperature compensation without additional sensors.
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 approach enables more accurate determination of fuel mass and properties, improving engine diagnostics and control while reducing complexity and cost by using a single pressure sensor to estimate sonic speed and account for fuel characteristics like temperature and composition.
Implementation Method 1
a determiner in communication with the pressure sensor, wherein the determiner is structured to estimate a sonic speed of a fuel based on identification of a fundamental oscillation frequency
Implementation Method 2
estimate a sonic speed of a fuel in response to identification of a fundamental oscillation frequency
Data Source
AI summary
Diagnostic systems including a pressure sensor, a determiner in communication with the pressure sensor, wherein the determiner is structured to estimate a sonic speed of a fuel based on identification of a fundamental oscillation frequency are disclosed. Also disclosed are diagnostic methods comprising receiving, by a pressure interpreter, a pressure signal, determining, by a determiner in communication with the pressure interpreter, a fundamental frequency of oscillation of the pressure signal, and determining, by the determiner, a sonic speed of a fuel based on the fundamental frequency of oscillation.