Knocking Detection via Multi-Band Ion Current Analysis
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Solution Overview
Problem
Current knocking detection technologies face challenges in distinguishing between knocking and other disturbances in internal combustion engines, particularly due to the low energy requirement of the ρ10 mode resonance frequency component and the proximity of higher-order resonance frequencies to engine block vibrations, leading to inaccurate signal separation and reduced detection precision.
Innovation Solution
A knocking detecting device with a signal processing module that analyzes ion current signals to determine knocking occurrence intensity by calculating frequency intensities across multiple frequency bands, requiring at least two primary determination results to confirm knocking, thereby enhancing precision and distinguishing between knocking and other disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the ρ10 mode resonance frequency component is used for knocking detection, then the detection sensitivity is improved, but the detection precision deteriorates due to frequent occurrence without knocking
Solution Approach 1:
The patent segments the resonance frequency spectrum into multiple frequency bands (first frequency band with first resonance frequency and second frequency band with second resonance frequency). By analyzing knocking indicators in separate frequency bands rather than using a single frequency component, the system can distinguish between genuine knocking signals and false ρ10 mode resonances, thereby improving detection accuracy while maintaining sensitivity.
2Measurement precision
If higher-order resonance vibrations are used for knocking detection, then the detection precision is improved, but the signal stability deteriorates due to quick attenuation
Solution Approach 1:
The patent merges information from multiple frequency bands by calculating knocking indicators for both the first and second frequency bands, then combining these indicators to make the final knocking determination. This integration allows the system to leverage the precision of higher-order resonance vibrations while compensating for their quick attenuation through multi-band signal processing and temporal analysis.
3Measurement precision
If multiple frequency bands are analyzed for knocking detection, then the detection precision is improved, but the device complexity increases
Solution Approach 1:
The patent extracts and analyzes only specific frequency bands (first frequency band containing first resonance frequency and second frequency band containing second resonance frequency) that are most relevant for knocking detection. By focusing on these targeted frequency ranges rather than processing the entire spectrum, the system achieves high detection precision while limiting the computational complexity to essential frequency components.
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 allows for precise discrimination of knocking occurrences, improving combustion efficiency by accurately controlling ignition timing and reducing the risk of engine damage.
Implementation Method 1
The knocking detecting device detects resonance frequencies within two or more cylinders to obtain a knocking indicator based on the sum of those resonance frequency components
Implementation Method 2
a vibration sensor 7 that is attached to the engine block 6
Data Source
AI summary
The present invention relates to a knocking detecting device for an internal combustion engine, for controlling a timing at which an ignition coil is actuated according to a knocking occurrence intensity, the knocking detecting device including the signal processing module for processing a signal attributable to knocking occurring in the operation of the internal combustion engine to determine a knocking occurrence intensity, in which the signal processing module includes: signal detecting means for detecting a signal attributable to knocking; frequency intensity calculating means for selecting a plurality of frequencies extracted from an output of the signal detecting means to calculate a frequency intensity; and knocking intensity determining means for finally determining that knocking occurs in a case where it is determined that at least two primary determination results of among a plurality of primary knocking determination results based on the outputs of the frequency intensity calculating means.