Engine Control Actuator Positioning for Vibration Reduction
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Solution Overview
Problem
Existing methods for improving internal combustion engine running smoothness, such as detecting combustion misfires, fail to address uneven running issues below threshold values, leading to uncomfortable driving behavior and increased emissions.
Innovation Solution
A method and control device that determine an uneven running value for each combustion chamber, moving actuators to a position with minimal influence on combustion when the value exceeds a threshold, and suppressing combustion in problematic chambers to improve engine smoothness and reduce emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the threshold value for detecting combustion misfires is set high to avoid false detections, then the reliability of misfire detection is improved, but uneven running below the threshold value leads to uncomfortable driving behavior and increased emissions
Solution Approach 1:
The patent segments the threshold-based detection into two distinct levels: a first threshold for mild uneven running conditions and a second threshold for severe misfire conditions. This segmentation allows the system to apply different responses appropriate to each severity level, thereby improving both reliability and reducing harmful factors without false detections.
Solution Approach 2:
The patent changes the parameter of threshold values by introducing two distinct threshold levels instead of one. The first threshold is set for detecting mild uneven running, while the second threshold is set higher for confirming severe misfires. This parameter change enables the system to respond appropriately to different severity levels, improving both detection reliability and reducing emissions.
2Stability of the object's composition
If the actuator is moved to adjust combustion parameters when uneven running is detected, then the running smoothness is improved, but the complexity of the control system increases
Solution Approach 1:
The patent applies dynamics by making the actuator position adjustable and controllable based on detected uneven running conditions. The actuator can be moved to different positions to optimize combustion parameters, transforming a static system into a dynamic one that adapts to varying engine conditions, thereby improving running smoothness.
Solution Approach 2:
The patent implements feedback by continuously monitoring uneven running parameters and using this information to control actuator positioning. The control device receives feedback from the engine's combustion state and adjusts the actuator accordingly, creating a closed-loop control system that improves running smoothness while managing complexity through intelligent control strategies.
3Object-generated harmful factors
If combustion is suppressed in a combustion chamber with severe uneven running, then emissions are reduced, but the power output of the engine decreases
Solution Approach 1:
The patent applies preliminary anti-action by detecting and addressing mild uneven running conditions before they escalate into severe misfires. By intervening early with actuator adjustments and only suppressing combustion as a last resort when the second threshold is exceeded, the system prevents harmful emissions while minimizing the need for power-reducing combustion suppression.
Solution Approach 2:
The patent applies partial action by selectively suppressing combustion only in specific combustion chambers where severe uneven running is detected, rather than suppressing combustion in all chambers. This partial suppression approach reduces emissions from problematic cylinders while maintaining power output from healthy cylinders, optimizing the trade-off between emissions and power.
Data Source
AI summary
In a method for improving the running smoothness of an internal combustion engine (1) which has at least one combustion chamber and at least one controllable actuator whose position has an influence on the combustion in the at least one combustion chamber, an irregular running value (f) of the internal combustion engine (1) is determined and compared with a predefined first irregular running limit value (f1thres), and in the event of the irregular running value (f) exceeding a predefined first irregular running limit value (f1thres), the actuator is moved from a starting position into an end position while the combustion in all of the combustion chambers of the internal combustion engine (1) is continued.