Engine Control Transient Correction via Dynamic Filter Switching
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Solution Overview
Problem
Conventional internal combustion engine control systems face delays in detecting transient-operation mode and require extensive machine-hours to accurately determine and implement transient correction amounts, such as acceleration/deceleration degree, correction period, and reduction speed.
Innovation Solution
An internal combustion engine control apparatus that includes an operation status value detection unit, filtering processing unit, operation status value difference calculation unit, normalization unit, and transient correction unit, which detects and corrects control amounts based on normalized operation status value differences to quickly identify transient-operation mode and adjust accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If filtering processing is applied to operation status values to reduce fluctuation in steady-operation mode, then control stability is improved, but response speed deteriorates in transient-operation mode
Solution Approach 1:
The patent applies dynamic filtering by switching between different filter coefficients based on operation mode. In steady-operation mode, a larger filter coefficient is used to reduce fluctuation and improve stability. In transient-operation mode, a smaller filter coefficient is used to maintain fast response speed. The system dynamically adjusts the filtering strength according to real-time operation conditions, resolving the contradiction between stability and response speed.
Solution Approach 2:
The patent changes the filter coefficient parameter based on operation mode detection. By detecting whether the engine is in steady or transient operation and adjusting the filter coefficient accordingly, the system optimizes both stability during steady operation and response speed during transient operation. This parameter adaptation resolves the technical contradiction by allowing different optimization priorities under different operating conditions.
2Measurement precision
If filter coefficient is set large to reduce fluctuation in steady-operation mode, then knock detection accuracy is improved, but transient correction capability deteriorates
Solution Approach 1:
The patent dynamically adjusts the filter coefficient based on detected operation mode. During steady-operation mode, a large filter coefficient is applied to reduce background level fluctuation and improve knock detection accuracy. During transient-operation mode, the system switches to a small filter coefficient to maintain fast tracking capability for transient corrections. This dynamic adjustment resolves the contradiction between measurement precision and transient correction capability.
Solution Approach 2:
The system changes the filter coefficient parameter according to operation conditions. By detecting transient operation and switching to a smaller filter coefficient, the system prioritizes transient correction capability. During steady operation, it uses a larger coefficient to prioritize knock detection accuracy. This parameter adaptation based on operation mode resolves the technical contradiction.
3Ease of operation
If conventional methods are used to detect transient-operation mode based on throttle opening degree changes, then detection simplicity is maintained, but detection delay occurs
Solution Approach 1:
The patent segments the detection process by using multiple operation status values (throttle opening degree, air-intake amount, and engine rotation speed) instead of relying on a single parameter. This multi-parameter segmentation approach enables earlier and more accurate detection of transient operation mode, reducing detection delay while maintaining reasonable system complexity through modular detection of each parameter.
Solution Approach 2:
The patent uses multiple operation status values that serve multiple functions: they are used for both steady-operation and transient-operation mode detection, and for calculating transient correction amounts. This multi-functional use of detection data reduces overall system complexity while improving detection speed, as the same sensors and processing pathways serve multiple purposes.
4Measurement precision
If extensive machine-hours are spent calculating transient correction amounts, then correction accuracy is improved, but control efficiency deteriorates
Solution Approach 1:
The patent performs preliminary calculation of transient correction amounts by detecting transient operation mode early through multiple operation status values. By detecting the transient mode earlier and initiating correction calculations promptly, the system achieves accurate corrections without requiring extensive machine-hours, thus maintaining control efficiency while improving correction accuracy.
Solution Approach 2:
The patent replaces complex, time-consuming calculation methods with a streamlined approach that uses normalized operation status value differences. This substitution of the calculation mechanism reduces the machine-hours required while maintaining correction accuracy, thereby improving control efficiency without sacrificing precision.
Data Source
AI summary
An operation status value detection unit detects two or more operation status values indicating an operation status of an internal combustion engine. A filtering processing unit applies filtering processing to the detected operation status values, and an operation status value difference calculation unit calculates the difference between the filter-processed operation status value and the corresponding non-filter-processed operation status value so as to calculate two or more operation status value differences. An operation status value difference normalization unit normalizes the two or more operation status value differences, based on predetermined reference values for the two or more operation status values, so as to calculate two or more normalized operation status value differences; and a transient correction unit corrects a control amount for controlling output of the internal combustion engine, based thereon, when the engine is in a transient-operation mode.