Engine Knocking Controller Frequency Band Segmentation
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Solution Overview
Problem
Existing controller technologies for internal combustion engines face increased calculation processing loads when determining knocking and mechanical noise, leading to reduced accuracy in knocking detection due to the need for multiple frequency band analysis and complex calculations.
Innovation Solution
A controller and control method that calculate the strength of components in two frequency bands, where the second frequency band is higher than the first, allowing for accurate knocking determination by comparing maximum values without relying on the second frequency band for mechanical noise detection, thus reducing computational load and improving sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple frequency band analysis is performed to determine knocking and mechanical noise, then measurement precision is improved, but calculation processing load increases
Solution Approach 1:
The patent segments the frequency analysis into two distinct frequency bands: a first frequency band for knocking detection and a second frequency band for mechanical noise detection. By dividing the analysis into separate segments with different purposes, the system achieves comprehensive knocking detection accuracy while avoiding the need for complex full-spectrum analysis, thus reducing calculation processing load.
Solution Approach 2:
The patent extracts and isolates the mechanical noise component by analyzing it in a separate second frequency band from the knocking signal in the first frequency band. This extraction allows the system to identify and exclude mechanical noise from the knocking determination process, maintaining measurement precision while simplifying the overall calculation by handling noise separately rather than requiring complex joint analysis.
2Measurement precision
If complex calculations are performed to determine knocking occurrence, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The patent segments the determination process into two independent stages: first determining knocking occurrence based on the first frequency band signal, then separately determining mechanical noise based on the second frequency band signal. This segmentation allows each stage to use simplified calculations appropriate to its specific purpose, improving processing speed while maintaining overall determination accuracy.
Solution Approach 2:
The patent performs preliminary determination of knocking occurrence using the first frequency band before conducting the second frequency band analysis for mechanical noise. This preliminary action allows the system to quickly identify potential knocking events and then use the second frequency band analysis to confirm or exclude them, improving overall processing efficiency by avoiding unnecessary complex calculations when knocking is clearly present or absent.
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 efficient detection of knocking with high sensitivity while minimizing the impact of mechanical noise, ensuring accurate determination and preventing erroneous ignition timing adjustments.
Implementation Method 1
the controller which detects the knocking phenomenon which occurs in the internal combustion engine by the vibration sensor (hereinafter, referred to as the knocking sensor) directly attached to the combustion chamber block
Data Source
AI summary
To provide a controller and a control method for internal combustion engine which can suppress the increase in the calculation processing load for determining occurrence of the mechanical noise and occurrence of the knocking with good accuracy even when the mechanical noise occurs. When the maximum value of the strength of the component of the second frequency band in the comparison period exceeds the maximum value of the strength of the component of the first frequency band, a controller for internal combustion engine performs a second side stop determination processing that determine whether the knocking occurred, based on the strength of the component of the first frequency band, without using the strength of the component of the second frequency band.