Motor Vehicle Flap Drive Control via Model Estimation and Cycle Segmentation
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Solution Overview
Problem
Existing methods for controlling motor vehicle flap drive arrangements are either costly due to the use of multiple sensor systems or lack accuracy when relying on unreliable commutation ripple-based estimation methods for determining movement values.
Innovation Solution
A method that estimates movement values using a drive model and corrects these estimates only during specific parts of the motorized movement cycle, allowing for reliable control with reduced costs by using less reliable measurement methods indirectly, and enabling high dynamics for anti-trap protection functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two sensor systems with Hall sensors are used to detect movement values, then control accuracy is improved, but cost increases
Solution Approach 1:
The patent introduces an intermediary estimation routine that uses a drive model to calculate movement values based on readily available motor variables (current, voltage, rotation speed) rather than direct sensor measurement. This intermediary approach provides sufficiently accurate movement value estimation for control purposes without requiring expensive sensor systems, thereby resolving the contradiction between measurement precision and device complexity.
2Device complexity
If commutation ripple-based estimation is used to determine movement values without sensors, then cost is reduced, but measurement reliability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the estimated movement values from the drive model are continuously compared with actual sensor measurements during specific movement phases. The differences (deviations) are used to correct the drive model parameters, improving the reliability of future estimations. This feedback loop transforms the unreliable estimation method into a progressively more accurate system while avoiding the need for continuous expensive sensor input.
Solution Approach 2:
The patent performs preliminary correction of the drive model during specific phases of the movement cycle (such as during acceleration or deceleration phases where sensor data is reliable) before the main movement phase. This preliminary action ensures that the estimation routine is pre-calibrated with accurate model parameters, improving reliability without requiring sensors throughout the entire operation.
3Measurement precision
If correction routine is applied continuously throughout the movement cycle, then estimation accuracy is improved, but processing time increases
Solution Approach 1:
The patent segments the movement cycle into different phases and applies the correction routine only during specific segments where sensor data is reliable and corrections are most effective (such as acceleration and deceleration phases). During other phases where sensor data may be unreliable or where corrections would have minimal impact, the correction routine is suspended. This segmentation maintains estimation accuracy while significantly reducing processing time and computational load.
Data Source
AI summary
The disclosure provides a method for controlling a drive arrangement for a flap of a vehicle by a control arrangement, wherein in a measuring routine a measured movement value is measured by a movement measuring system. It is proposed that in an estimation routine an estimated movement value is estimated, in a movement routine the estimated movement value is determined via the estimation routine and the flap is adjusted according to a set movement value, in a correction routine the estimated movement value is determined from the estimation routine and an estimation error is determined and from the estimated movement value and according to a correction specification the set of model parameters is corrected based on the estimation error and supplied to the estimation routine and in the correction routine the correction of the set of model parameters is performed for a part section of the motorized movement cycle.