Knocking Detection Apparatus Adaptive Background Level
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Solution Overview
Problem
Existing knocking detection methods in internal combustion engines face challenges in accurately detecting knocking due to changes in engine speed and load, leading to erroneous determinations and potential errors in ignition timing, which affect power, exhaust, and fuel consumption performance.
Innovation Solution
A knocking detection apparatus that estimates a background level based on the engine's operating state, using a combination of resonant frequency components to calculate a knocking determination index, thereby reducing erroneous determinations and improving detection accuracy during both steady and transient operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a delay filter is used to calculate the background level, then the smoothing processing intensity can be increased, but the responsiveness delay increases causing erroneous knocking detection during transient operation
Solution Approach 1:
The patent applies dynamics by making the background level calculation adaptive to engine operating conditions. Instead of using a fixed delay filter, the system dynamically adjusts the background level estimation based on detected knocking patterns and engine state changes, allowing the calculation to follow transient operations without excessive delay while maintaining smoothing during steady operation.
Solution Approach 2:
The patent changes the parameter of background level calculation from a static delay filter approach to a dynamic estimation approach that adjusts based on engine operating state. This allows the system to maintain appropriate smoothing intensity while reducing responsiveness delay during transient conditions by adapting the calculation method to current operating parameters.
2Productivity
If the compression ratio is increased to improve fuel economy and exhaust purification, then engine efficiency improves, but knocking occurrence increases reducing detection accuracy
Solution Approach 1:
The patent addresses this contradiction by changing the detection parameters to account for different engine operating conditions including higher compression ratios. The system adapts the background level estimation and knocking threshold detection to compensate for increased knocking tendency, maintaining detection accuracy despite the higher compression ratio enabling improved fuel economy.
3Device complexity
If a single resonant frequency component is used for knocking detection, then the detection method is simple, but knocking cannot be accurately detected when background level increases at high-speed rotation
Solution Approach 1:
The patent applies segmentation by dividing the frequency spectrum into multiple resonant frequency components for analysis. Instead of using a single frequency band, the system segments the detection into multiple frequency components, allowing it to identify knocking patterns even when background noise increases at high-speed rotation, thereby improving accuracy while maintaining reasonable system complexity.
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 solution enhances the intensity of smoothing processing, reducing erroneous knocking determinations and improving knock detection accuracy, ensuring optimal engine performance regardless of operating conditions.
Implementation Method 1
Vibration of gas in a combustion chamber is caused by self-ignition of unburned gas at a terminal section of the combustion chamber, and the vibration is transmitted to an engine body.
Data Source
AI summary
Provided is a knocking detection apparatus capable of reducing erroneous determination of knocking during transition, and improving knocking detection accuracy regardless of whether an engine is in steady operation or transient operation. A knocking detection apparatus according to the present invention estimates a background level based on an operating state of an internal combustion engine, and calculates a knocking determination index by using the estimated value.