Door Drive Sensor Apparatus for Force Flow Measurement
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Solution Overview
Problem
Existing door drive devices for vehicles face challenges in maintaining a constant adjustment force despite external and internal influences, such as vehicle position and wear, which affects the reliability of motor-assisted door adjustment.
Innovation Solution
A door drive device with a sensor apparatus that measures changes in position between the gear housing and adapter elements or guide rails to determine the force flow, allowing for motor-assisted adjustment with a consistent user force application, independent of external and internal influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the door drive device is configured to be compact to fit limited installation space in the vehicle door, then the installation space requirement is reduced, but the integration of a sensor apparatus for reliable force measurement becomes more difficult
Solution Approach 1:
The sensor apparatus is integrated directly into the existing door drive device structure, merging the force measurement function with the adjustment mechanism. The sensor is positioned within the force flow path between the adjustment part and the vehicle door, allowing compact integration without requiring separate measurement systems.
Solution Approach 2:
The door drive device is designed to simultaneously perform adjustment function and force measurement function through a unified structure. The adjustment part serves both to move the vehicle door and to transmit force that is measured by the sensor, eliminating the need for separate measurement components.
2Reliability
If external and internal influences such as vehicle position and wear are present, then the force required for door adjustment varies, but the user experience deteriorates due to non-constant adjustment force
Solution Approach 1:
The sensor apparatus continuously measures the force in the force flow during door adjustment and provides feedback to the control system. Based on this feedback, the control system adjusts the motor assistance to maintain constant total adjustment force, compensating for variations caused by external and internal influences.
Solution Approach 2:
The system dynamically changes the motor assistance parameter based on the measured force conditions. When the measured force deviates from the target constant force, the control system adjusts the motor output to compensate, thereby maintaining consistent adjustment force despite changes in vehicle position, weather conditions, tolerances, or wear.
3Ease of operation
If motor-assisted adjustment with servo function is implemented to maintain constant user force, then the ease of operation is improved, but the device complexity increases due to the need for sensor apparatus and control system
Solution Approach 1:
The sensor apparatus is integrated into the existing door drive device structure, merging the force measurement function with the adjustment mechanism. The sensor is positioned within the force flow path between the adjustment part and the vehicle door, allowing compact integration without requiring separate measurement systems.
4Measurement precision
If the sensor apparatus measures force flow between vehicle door and vehicle body, then the measurement precision is improved, but the device complexity increases due to additional components
Solution Approach 1:
The sensor apparatus is integrated directly into the existing door drive device structure, merging the force measurement function with the adjustment mechanism. The sensor is positioned within the force flow path between the adjustment part and the vehicle door, allowing compact integration without requiring separate measurement systems.
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
Enables reliable and accurate force measurement and motor-assisted adjustment, ensuring a constant force is applied over the adjustment path, regardless of environmental or internal factors, thus improving the servo function and user experience.
Implementation Method 1
the sensor apparatus is configured to detect a change in position between the gear housing and the adapter element and/or between the gear housing and a component of the gear assemblies in order to determine the measured value
Data Source
AI summary
It is provided a door drive device for adjusting a vehicle door relative to a vehicle body comprising an adjustment part, which can be adjusted in an adjustment direction, for transmitting force between the vehicle door and the vehicle body, a drive motor, a gear assembly which couples the drive motor to the adjustment part, and a gear housing which at least partially encloses the gear assembly. An adapter element is connected to the gear housing for fastening the door drive device to the vehicle door or the vehicle body. A sensor apparatus is used to determine a measured value which indicates a force between the vehicle door and the vehicle body.