Adaptive Throttle Positioning via Pilot Control and Feedback
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Solution Overview
Problem
Existing methods for positioning throttle butterflies in internal combustion engines are inefficient, requiring excessive time to achieve the set position due to manufacturing tolerances, environmental influences, and aging, which complicates the relationship between control values and actuator positions.
Innovation Solution
An adaptive positioning method that presets a set position, selects a pilot value, adjusts the pilot position, compares it with the set position, and records the adapted control values as a function of the set position, allowing for efficient and precise adjustments by storing these values in an engine operating map, considering boundary conditions like pressure difference, temperature, and air-mass flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional feedback regulation methods are used to adjust throttle butterfly position, then manufacturing tolerances and aging are compensated, but the adjustment time is excessively long
Solution Approach 1:
The patent applies preliminary action by pre-determining pilot values for different throttle positions during system initialization or calibration. These pilot values are stored in memory and retrieved during operation to directly control the actuator, eliminating the need for time-consuming feedback regulation. The control unit uses the stored pilot values to immediately adjust the throttle butterfly to the desired position, significantly reducing adjustment time while maintaining accuracy.
2Speed
If pilot control values are used to quickly adjust throttle position, then response speed is improved, but manufacturing tolerances and environmental influences cause position inaccuracies
Solution Approach 1:
The patent combines feedback control with pilot control by using a sensor to detect the actual throttle butterfly position and comparing it with the target position. The control unit calculates the deviation and applies a correction value to the pilot control signal. This feedback mechanism compensates for position inaccuracies caused by manufacturing tolerances and environmental influences, ensuring high positioning accuracy while maintaining the fast response characteristics of pilot control.
3Manufacturing precision
If adaptive positioning method with multiple calibration points is implemented, then position accuracy across the regulating range is improved, but system complexity and calibration effort increase
Solution Approach 1:
The patent applies segmentation by dividing the throttle butterfly's regulating range into multiple discrete calibration points. At each calibration point, the system stores a pilot value corresponding to a specific throttle position. During operation, the control unit selects the appropriate pilot value based on the desired position, ensuring high accuracy across the entire regulating range. This segmented approach simplifies the calibration process compared to continuous calibration while maintaining high positioning accuracy.
Data Source
AI summary
In an adaptive positioning method for an actuator, in particular, for a throttle butterfly on an internal combustion engine, during the adaptive positioning method, after a request for a set position and selection of a pilot value a corresponding pilot position for the actuator is adopted. The pilot position is adjusted until said position corresponds to the requested set position. The control value actually required or this set position is subsequently measured and recorded as corrected pilot value for the corresponding set position.