Vehicle Door Motor Control for Foreign Object Detection
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Solution Overview
Problem
Existing driving control devices for vehicle opening and closing bodies face challenges in accurately detecting foreign member insertion, particularly at the fully-closed state, leading to erroneous detection due to variations in assembly and operation conditions.
Innovation Solution
A driving control device that includes a rotation detection section to monitor the motor's rotation amount and speed, a calculation section to determine the rotation speed difference between the idling and current speeds, and an insertion detection section that sets a decreasing threshold value to match the fully-closed state, thereby reducing erroneous detection by maintaining a consistent detection threshold across the error range of the fully-closed state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed threshold value is used for foreign member insertion detection, then the detection method is simple, but erroneous detection occurs at the fully-closed state due to assembly variations
Solution Approach 1:
The threshold value is changed from a fixed constant to a dynamic value that varies according to the motor's rotation amount. The threshold is set to decrease monotonously as rotation amount increases, and is maintained at a specific value within the error range corresponding to the fully-closed state, thereby adapting to assembly variations and preventing erroneous detection.
Solution Approach 2:
The detection threshold parameter is modified based on the rotation amount of the motor. By establishing a correspondence between rotation amount and threshold value, the system adjusts the detection criterion dynamically, ensuring accurate foreign member detection while accommodating variations in the fully-closed state position.
2Reliability
If the threshold value is adjusted to accommodate assembly variations, then erroneous detection is reduced, but the detection system becomes more complex
Solution Approach 1:
The system automatically adjusts the threshold value based on the detected rotation amount without requiring external calibration or manual intervention. The control device itself performs the threshold adjustment by referencing the pre-established correspondence between rotation amount and threshold value, making the system self-adapting to assembly variations.
3Measurement precision
If a decreasing threshold value is used to match fully-closed state, then detection accuracy is improved, but calculation complexity increases
Solution Approach 1:
The correspondence between rotation amount and threshold value is predetermined and stored in advance. During operation, the control device simply retrieves the appropriate threshold value based on the current rotation amount rather than performing complex real-time calculations, thereby maintaining detection precision while minimizing computational complexity.
Data Source
AI summary
There is provided a driving control device of an opening and closing body, which drives the opening and closing body in a closed state by a motor through an idling section thereof. The device includes a calculation section for calculating a rotation speed difference between a rotation speed of the motor in the idling section and a current rotation speed of the motor; and an insertion detection section for detecting insertion of a foreign member based on the calculated rotation speed difference and a predetermined threshold value. The threshold value monotonously decreases according to an increase in the rotation amount of the motor to coincide with a fully-closed state threshold value at a predetermined rotation amount of the motor within an error range of the rotation amount corresponding to the fully-closed state, and to maintain the fully-closed state threshold value to a maximum rotation amount in the error range.