Vehicle Open-Close Body Controller Adaptive Threshold for Wear
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Solution Overview
Problem
Existing open-close body controllers for vehicles, such as window controllers, often experience erroneous determination of movement interference due to increased wear and backlash in the drive mechanism, leading to variations in motor characteristic values and incorrect interference detection.
Innovation Solution
An open-close body controller with a motor, a movement interference determination unit, and a disturbance determination unit that adjusts the threshold value based on the varied rotation amount of the motor to narrow the movement interference range, reducing erroneous determinations caused by wear and external disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive mechanism operates over time, then the motor can open and close the open-close body, but wear increases backlash leading to variations in motor characteristic values and erroneous determination of movement interference
Solution Approach 1:
The patent applies dynamics by making the threshold value adaptive rather than fixed. The threshold value is dynamically adjusted based on the varied amount of rotation amount of the motor, allowing the system to adapt to changes in motor characteristics over time due to wear and backlash. This dynamic adjustment maintains accurate movement interference detection throughout the service life of the drive mechanism.
Solution Approach 2:
The patent changes the parameter of the threshold value based on motor rotation amount variations. By monitoring the varied amount of rotation amount and adjusting the threshold value accordingly, the system compensates for wear-induced changes in motor characteristics, maintaining reliable interference detection over extended operation periods.
2Measurement precision
If the threshold value is set to detect movement interference, then foreign object entrapment can be detected, but wear and backlash cause the characteristic values to vary leading to false positives
Solution Approach 1:
The patent implements feedback by using the varied amount of rotation amount as feedback information to adjust the threshold value. The disturbance determination unit monitors motor behavior and feeds this information back to the movement interference determination unit, which then adjusts the threshold value to maintain accurate detection while reducing false positives caused by wear and backlash.
Solution Approach 2:
The threshold value is made dynamic and adaptive based on actual motor performance. By continuously adjusting the threshold value according to the varied rotation amount, the system maintains precise foreign object detection capability while compensating for degradation in motor characteristics over time.
Data Source
AI summary
An open-close body controller includes a motor, movement interference determination unit, and disturbance determination unit. Motor is configured to open and close an open-close body of vehicle. Movement interference determination unit is configured to detect whether characteristic value of motor, which is varied in accordance with change in load applied to open-close body when moving, is in movement interference range or non-movement interference range bordering threshold value and determine that movement of open-close body has been interfered with by foreign object when characteristic value is in movement interference range. Disturbance determination unit is configured to determine whether motor is subject to effect of disturbance. Movement interference determination unit is configured to correct threshold value to narrow movement interference range based on varied amount of rotation amount of motor that corresponds to movement distance of open-close body when disturbance determination unit determines motor is subject to effect of disturbance.