Fuel Density Detection via Pulsation Frequency Deviation
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Solution Overview
Problem
The existing methods for detecting fuel density using pressure sensor devices are prone to decreased accuracy due to noise in sensor signals, which affects the detection of pressure pulsation characteristics and subsequently the fuel density.
Innovation Solution
A fuel density detection device that includes a pulsation detection unit to detect the pulsation frequency of pressure pulsations in a fuel injection system, a storage unit to store reference characteristics, and a density detection unit to calculate fuel density based on the deviation between actual and reference characteristics, thereby enhancing detection accuracy without relying on a density sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fuel density is detected using only pressure sensor device and pressure pulsation characteristics, then device complexity is reduced and cost is lowered, but detection accuracy decreases due to noise in sensor signals
Solution Approach 1:
The patent introduces a reference pulsation waveform as an intermediary element to compare against the actual pressure pulsation waveform. By storing reference characteristics (frequency, cycle, or phase) obtained under known fuel density conditions and comparing them with actual measurements, the system can accurately determine fuel density even when noise affects the raw sensor signals. This intermediary reference acts as a stable benchmark that compensates for signal quality issues.
Solution Approach 2:
The system performs preliminary measurement and storage of reference pulsation characteristics under controlled conditions (known fuel density, specific injection parameters) before actual fuel density detection. These pre-established reference values (frequency, cycle, phase relationships) are stored in memory and used as baseline for subsequent comparisons, enabling accurate detection without requiring complex real-time calibration.
2Ease of operation
If peak position detection is used to determine pressure pulsation frequency, then detection process is simplified, but detection accuracy decreases when sensor signal contains noise causing peak position shifts
Solution Approach 1:
The system employs feedback by continuously comparing the actual pressure pulsation waveform against the stored reference waveform and using the deviation (phase difference, frequency difference, cycle difference) to determine fuel density. This comparative feedback mechanism allows the system to compensate for noise-induced peak shifts by referencing the stable, pre-established waveform characteristics rather than relying solely on instantaneous peak detection.
Solution Approach 2:
The patent creates a copy of the reference pressure pulsation waveform characteristics (frequency, cycle, phase) and stores it in memory. This copied reference data serves as a stable template against which actual measurements are compared. By using this copied reference instead of directly measuring from noisy signals, the system maintains detection accuracy while keeping the process simple.
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 configuration allows for accurate detection of fuel density by minimizing the impact of noise in sensor signals and accounting for variations in machine differences, resulting in improved precision and reliability.
Implementation Method 1
a pressure sensor configured to detect the fuel pressure of fuel supplied to a fuel injection valve
Implementation Method 2
a pulsation detection unit configured to detect, as an actual characteristic, a pulsation frequency of a pressure pulsation, which is caused in the fuel pressure
Implementation Method 3
a density detection unit configured to detect a fuel density according to a quantity of deviation between the reference characteristic, which is stored in the storage unit, and the actual characteristic, which is detected with the pulsation detection unit
Data Source
AI summary
A pulsation detection unit detects, as an actual characteristic, a pulsation frequency of a pressure pulsation, which is caused in fuel pressure, or a physical quantity corresponding to the pulsation frequency, according to a sensor signal from a pressure sensor. The pressure sensor detects a fuel pressure of fuel supplied to a fuel injection valve, which is equipped to an internal combustion engine. A storage unit stores, as a reference characteristic, a reference frequency of a predetermined reference pulsation or a physical quantity corresponding to the reference frequency. A density detection unit detects a fuel density according to a quantity of deviation between the reference characteristic, which is stored in the storage unit, and the actual characteristic, which is detected with the pulsation detection unit.