Engine Controller Chipped Tooth Period Estimation
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Solution Overview
Problem
Conventional methods for detecting the crank angle in internal combustion engines, such as JP 6237303 B, suffer from reduced estimation accuracy when the period suddenly varies in the chipped tooth section, as they only consider period variations before the chipped tooth section.
Innovation Solution
A controller for internal combustion engines that includes an angle information detection unit and a chipped tooth period estimation unit, which estimates the period of a virtual unit angle interval by considering periods before and after the chipped tooth section, ensuring accurate estimation even with sudden variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only the period before the chipped tooth section is considered for estimation, then the device complexity is reduced, but the measurement precision of the period in the chipped tooth section deteriorates when the period suddenly varies
Solution Approach 1:
The method performs preliminary actions by detecting and storing periods from multiple sections (before, during, and after the chipped tooth section) before the actual estimation is needed. This allows the system to have pre-prepared data from different temporal contexts, enabling more accurate estimation when the chipped tooth period needs to be determined, without adding complex real-time processing requirements.
Solution Approach 2:
The invention changes the estimation parameters by incorporating not only the period before the chipped tooth section but also periods after the chipped tooth section into the estimation calculation. This parameter expansion allows the system to adapt to sudden period variations by using a broader set of temporal reference data, improving measurement precision without significantly increasing device complexity.
2Ease of operation
If the period estimation method only uses data before the chipped tooth section, then the ease of operation is improved, but the reliability of the estimation deteriorates when sudden period variations occur
Solution Approach 1:
The period estimation process is segmented into distinct temporal sections: before the chipped tooth section, during the chipped tooth section, and after the chipped tooth section. Each segment's period data is detected and stored separately. This segmentation allows the system to systematically combine information from multiple reliable segments to estimate the chipped tooth period, improving overall reliability while maintaining operational simplicity through structured data collection.
Solution Approach 2:
The method implements feedback by using the detected period after the chipped tooth section to refine and improve the estimation of the chipped tooth period. This feedback mechanism allows the system to cross-validate measurements and adjust estimations based on observed variations, enhancing reliability without complicating the operational process.
Data Source
AI summary
To provide a controller for internal combustion engine which can improve the estimation accuracy of the period in the chipped tooth section, even if the period is suddenly varied in the chipped tooth section. A controller for internal combustion engine detects a period when the tooth passes, based on an output signal of the crank angle sensor; determines a period corresponding to the chipped tooth section; determines a crank angle corresponding to the passed tooth; and estimates a period of a virtual unit angle interval when assuming that the tooth is provided at the unit angle interval in the chipped tooth section, based on the period of the chipped tooth section, the period before the chipped tooth section, and the period after the chipped tooth section.