Electric Actuating Unit Position Counting During Reversal
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Solution Overview
Problem
Existing electric actuating units in vehicles, such as window raising mechanisms, face inaccuracies in position counting during reversing operations due to mechanical inertia and the need for precise direction detection, which is not adequately addressed by existing methods that require asymmetrical sensor wheels or frequent reinitialization, leading to increased costs and potential trapping issues.
Innovation Solution
A method and device using a sensor wheel with equidistant coding sectors and a single Hall sensor to write pulse interval count values into a ring buffer, comparing them with predefined reference data patterns to correct position counting, allowing precise reversal detection and correction even when the motor stops or during motor transition phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two Hall sensors are used for position counting to determine speed and direction of rotation, then position determination accuracy is improved, but system costs increase due to higher component and cable harness costs
Solution Approach 1:
The patent uses an asymmetrical sensor wheel with equidistant coding sectors where at least one sector has a different width than others. This asymmetry creates unique pulse patterns during reversing operations that allow a single Hall sensor to accurately detect direction changes and correct position counting errors, eliminating the need for two Hall sensors while maintaining measurement precision.
2Device complexity
If one Hall sensor is used for position counting to reduce costs, then system costs are reduced, but position determination accuracy deteriorates during reversing operations due to mechanical inertia causing position counting errors
Solution Approach 1:
The patent pre-stores reference data patterns in a buffer memory that represent expected pulse sequences during normal operation and reversing operations. During reversing operations, the actual pulse sequence is compared against these pre-stored reference patterns to identify the reversal moment and correct position counting errors, enabling accurate position determination with a single Hall sensor.
Solution Approach 2:
The patent implements a feedback mechanism where pulse sequences from the single Hall sensor are continuously monitored, compared against reference data patterns, and used to generate correction values. This feedback loop allows the system to detect reversing operations and correct position counting errors in real-time, maintaining accuracy despite using only one Hall sensor.
3Measurement precision
If the position count is reinitialized regularly by moving the window to its upper mechanical stop to avoid position inaccuracies, then position determination accuracy is improved, but mechanical system strain increases and costs increase
Solution Approach 1:
The patent replaces the mechanical reinitialization method with an electronic solution. Instead of physically moving the window to the upper stop to reset position counting, the system uses electronic comparison of pulse sequences against reference data patterns to detect reversing operations and correct position errors, eliminating unnecessary mechanical movements and reducing system strain.
4Measurement precision
If frequent reinitialization is performed to maintain position accuracy during frequent window movements and trapping events, then position determination accuracy is improved, but it becomes impossible when the window is not closed or opened completely
Solution Approach 1:
The patent uses continuous feedback from the Hall sensor pulse sequences compared against reference data patterns to detect reversing operations at any position, not just during complete opening/closing cycles. This allows position correction during partial movements and frequent trapping events without requiring the window to reach extreme positions, maintaining both accuracy and operational flexibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures accurate position counting during reversing operations, reducing inaccuracies and costs by using a single Hall sensor, while maintaining precise direction detection and compliance with trapping protection requirements.
Implementation Method 1
a single Hall sensor to write pulse interval count values into a ring buffer, comparing them with predefined reference data patterns
Data Source
AI summary
In a method and a device for identifying a reversing operation in an electric actuating unit of a vehicle, once a trapped object is detected, the rotational direction of the electromotive drive is commutated. Sequential pulse interval counter values, derived from a sensor system or data derived from the values is or are written to a ring buffer store and compared with pre-defined reference data patterns. If a match is found, the counter reading of the position counter is corrected in accordance with the pre-defined reference data pattern. This ensures that the counter reading of the position counter is correct even after a reversing operation.