Brake Pedal Orientation Sensing for Accurate Driver Request Detection
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Solution Overview
Problem
Conventional motor vehicles with brake-by-wire systems face challenges in accurately sensing driver requests due to variations in the orientation and position of the operating element, such as a brake pedal, which can affect the actuation force and precision of the braking system.
Innovation Solution
The setting device incorporates a displaceable operating element with a bearing device and a second sensor, such as an accelerometer, to monitor the current orientation of the operating element. This allows for precise determination of the driver's request regardless of the orientation or position of the operating element, by compensating for inclined positions and adjusting the actuation force accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operating element is made displaceable in different idle positions to improve ergonomics, then ease of operation is improved, but measurement precision of the driver request deteriorates due to orientation variations
Solution Approach 1:
The system performs preliminary detection of the operating element's orientation using the second sensor (accelerometer) before the first sensor measures the actuation force. This preliminary orientation data is stored and used to correct subsequent force measurements, ensuring accurate driver request sensing regardless of the element's position.
Solution Approach 2:
The system changes the measurement parameters by introducing a second sensor that detects orientation parameters (acceleration components). These orientation parameters are then used to adjust and correct the primary force measurement parameters, adapting the measurement system to the operating element's current orientation.
2Measurement precision
If a second sensor is added to detect orientation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The second sensor (accelerometer) serves multiple functions: it detects the orientation of the operating element, provides reference data for correcting force measurements, and can potentially monitor other dynamic characteristics. This multi-functionality justifies the addition of the sensor by extracting maximum value from a single component.
Solution Approach 2:
The second sensor acts as an intermediary that provides orientation information to the evaluation unit, which then uses this information to correct the readings from the first sensor. This intermediary measurement enables the system to compensate for orientation effects without requiring direct modification of the primary force sensing mechanism.
3Adaptability or versatility
If the operating element is displaceable to allow orientation adjustment, then adaptability is improved, but reliability of actuation force sensing deteriorates due to inclined positions
Solution Approach 1:
The system implements feedback by continuously monitoring the orientation of the operating element with the second sensor and using this information to correct the force measurements from the first sensor. This closed-loop approach ensures that the actuation force sensing remains reliable regardless of the element's inclined position or orientation.
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
The solution ensures reliable and precise sensing of driver requests, enabling optimal adjustment of the setting device to ergonomic requirements and improving the overall precision and comprehensibility of the braking system operation.
Implementation Method 1
a second sensor is associated with the operating element for sensing a current orientation of the operating element. The second sensor is an accelerometer.
Implementation Method 2
at least one controllable actuator is associated with the operating element, which can be controlled to perform a verification of the current orientation sensed by the second sensor for exerting a pulse of force on the operating element.
Data Source
AI summary
A setting device for sensing a driving request for a motor vehicle having an operating element which can be operated by a driver of the motor vehicle, wherein at least a first sensor is associated with the operating element for sensing actuation acting on the operating element, wherein the operating element is arranged in such a way that it can be moved by a bearing device into different idle positions. It is contemplated that a second sensor is associated with the operating element for sensing a current orientation of the operating element.