Actuator Stop Adaptation via Trigger Signal Thresholds
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Solution Overview
Problem
Electrically triggered actuators in motor vehicles face challenges in maintaining precise control of airflow due to temperature changes and contaminations, leading to potential premature stop encounters if the stop position is not accurately known or adapts incorrectly.
Innovation Solution
A method and device that adapt the stop position of an electrically triggered actuator by comparing a characteristic variable of the trigger signal with predefined values, using threshold values and predefined times to ensure precise control and prevent unnecessary adjustments, allowing for continuous adaptation in both directions to compensate for temperature and contamination effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the stop position is continuously adapted to compensate for temperature changes and contaminations, then the precision of airflow control is improved, but the risk of unnecessary adaptations due to temporary interferences or trigger signal fluctuations increases
Solution Approach 1:
The patent applies preliminary action by requiring that the comparison result between the characteristic variable and predefined value must be fulfilled for at least a predefined time before triggering stop position adaptation. This time-based filtering prevents premature adaptations due to temporary interferences or transient trigger signal fluctuations, ensuring that only sustained conditions trigger adaptation. The control unit stores the comparison result and only adapts the stop position when the condition persists throughout the predefined time period, thereby filtering out spurious signals while maintaining precision for genuine stop position drifts.
2Measurement precision
If the stop position is adapted based on characteristic variable comparisons, then the control precision at the lower stop is improved, but the complexity of the control system increases
Solution Approach 1:
The patent implements feedback by continuously monitoring the characteristic variable of the trigger signal, comparing it with predefined values, and using the comparison results to adapt the stop position. The control unit stores comparison results over a predefined time period and adjusts the stop position based on sustained deviations, creating a closed-loop feedback system that automatically compensates for temperature changes and contaminations without requiring complex external calibration equipment.
Solution Approach 2:
The system applies self-service by using its own operational data (trigger signal characteristic variables) to automatically detect and correct stop position drift. The actuator system monitors its own performance during normal operation and performs self-adjustment without requiring external intervention, test equipment, or additional sensors, thereby maintaining precision while minimizing added system complexity.
3Measurement precision
If threshold values are used to determine stop position adaptations, then the adaptation accuracy is improved, but the risk of premature stop encounters due to incorrect threshold selection increases
Solution Approach 1:
The patent applies parameter changes by using multiple predefined values for comparison, including at least a first predefined value and a second predefined value that is greater than the first. The control unit adapts the stop position in different directions based on which threshold is exceeded, allowing dynamic adjustment of the stop position parameter in response to varying operating conditions. This multi-level threshold approach enables accurate detection of stop position drift while preventing premature stop encounters through bidirectional adaptation capability.
Data Source
AI summary
A method and device for adapting a stop of an electrically triggered actuator are provided, which may be implemented in a precise and simple manner and allow for a continuous adaptation. For this purpose, a check is performed to determine whether a setpoint value for a position of the actuator to be set corresponds to a stop of the actuator. In this case, a characteristic variable of the trigger signal for triggering the actuator formed for implementing the setpoint value is compared with a predefined value. Depending on the result of the comparison, a position of the stop of the actuator is adapted.