Motor Vehicle Flap Drive Braking Control
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Solution Overview
Problem
The existing drive assemblies for motorized flap adjustments in motor vehicles experience high mechanical wear and risk of damage due to sudden braking forces when flaps are manually closed, as the drive components lag behind the flap movement and are abruptly stopped, leading to increased wear and potential damage.
Innovation Solution
A method is introduced where the drive control system activates the drive motor in a braking routine when the flap reaches a predetermined braking initiation position before the end position, generating a motorized braking effect to reduce mechanical wear by converting kinetic energy into electrical energy and gently decelerating the drive components, with the option to adapt the braking routine based on movement values and operating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual closing of the flap is performed, then the flap can be closed quickly and easily, but high braking forces act on the drive components causing increased wear and potential damage
Solution Approach 1:
The drive motor is activated in advance (before the flap reaches the end position) to generate a braking effect that smoothly decelerates the drive components. This preliminary activation prevents abrupt stopping and reduces mechanical wear on the drive assembly while maintaining easy manual operation.
Solution Approach 2:
The patent replaces purely mechanical braking (which causes wear) with an electromechanical braking system. The drive motor converts kinetic energy into electrical energy during deceleration, eliminating the need for mechanical friction brakes and reducing wear on mechanical drive components.
2Reliability
If the drive motor is activated to generate braking effect, then mechanical wear is reduced and drive components are protected, but the system complexity increases
Solution Approach 1:
The drive motor serves multiple functions: it can drive the flap during motorized adjustment, assist during manual adjustment, and generate braking effect during deceleration. By making the drive motor multi-functional, the patent avoids adding separate braking mechanisms, thus reducing overall system complexity while improving reliability.
Solution Approach 2:
The drive motor utilizes its own electromagnetic properties to generate braking effect during deceleration. The motor automatically converts kinetic energy into electrical energy when the flap approaches the end position, eliminating the need for external braking components and simplifying the overall drive system.
3Manufacturing precision
If the braking routine is activated based on flap position, then the braking effect can be precisely controlled, but the control system complexity increases
Solution Approach 1:
The control system continuously monitors the flap position and activates the braking routine when a predetermined braking initiation position is reached. This feedback-based control ensures precise braking activation while using simple position threshold comparison logic, minimizing control complexity.
Solution Approach 2:
The patent controls the braking effect by changing the activation parameter (flap position) rather than requiring complex force or acceleration control. By using position as the trigger parameter, the system achieves precise braking initiation with simple control logic.
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 effectively reduces mechanical wear and the risk of damage by smoothly decelerating the drive components, optimizing the adjustment path, and ensuring reliable operation across different operating scenarios, thereby enhancing the durability and efficiency of the drive assembly.
Implementation Method 1
at least some of the kinetic energy of the drive components can here be converted into electrical energy and be discharged
Data Source
AI summary
A method for operating a flap assembly of a motor vehicle, a drive assembly for the motorized adjustment of the flap, a motor vehicle lock, and a flap sensor assembly for identifying a flap position, wherein the drive assembly has at least one drive which is restorably movement-coupled to the flap, with an electric drive motor, wherein the motor vehicle lock fixes the flap in a closed position in a main locked state, wherein the drive motor is activated by a drive control system of the drive assembly depending on the identified flap position. It is proposed that when the identified flap position reaches a predetermined braking initiation position situated before an end position in a movement procedure of the flap, the drive motor is activated in a braking routine by the drive control system in such a way that the drive assembly produces a motorized braking effect.