Dynamic Release Energy Control for Vehicle Tailgate Drive Units
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Solution Overview
Problem
Existing moving devices in motor vehicles face issues with jolting and oscillation during component movement between end positions, leading to unnecessary wear and discomfort, due to the application of fixed release energy that does not account for varying starting positions, directions, and ambient conditions.
Innovation Solution
A method that dynamically selects release energy for the drive unit based on the starting position, movement direction, and ambient parameters, using a characteristic curve diagram or lookup table to optimize energy application, allowing for precise control through pulse-width modulation, and subsequent open-loop or closed-loop control for smooth movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed release energy is applied, then the release process is simplified, but the mechanism experiences unnecessary loading and wear
Solution Approach 1:
The system implements dynamic selection of release energy values based on starting position, allowing the drive unit to apply only the necessary energy for each situation. This prevents overloading the mechanism with excessive energy while maintaining relatively simple control logic through predefined energy sets
Solution Approach 2:
Instead of applying a fixed energy that may be excessive for some positions, the system applies partial energy appropriate to each starting position. This ensures sufficient energy for release while avoiding the harmful effects of excessive energy application that would increase wear and loading
2Reliability
If release energy is increased to ensure release from all positions, then release reliability improves, but movement irregularities and oscillation increase
Solution Approach 1:
The system changes the release energy parameter according to the starting position, using higher energy values only when necessary for difficult-to-release positions and lower values for easier positions. This maintains release reliability across all positions while preventing the movement irregularities that would result from uniformly high energy application
Data Source
AI summary
A movable component of a motor vehicle, for example a tailgate can be moved between two end positions by a drive unit of a moving device. A release energy for the drive unit, which is to be used to release the component at the start of a movement from a starting position, is selected as a function of the starting position.