Sliding Pedal Actuator for Precise Brake-By-Wire Input Sensing
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Solution Overview
Problem
Existing actuation devices for motor vehicles lack efficient mechanisms for detecting driver inputs in brake and acceleration requests without mechanical coupling, leading to potential misinterpretation and wear issues due to lack of precise stroke detection.
Innovation Solution
The actuation device features a sliding housing design with a bar-shaped projection and guide receptacle, incorporating a sliding bearing element, spring elements, and an illumination device, allowing for low-stroke, low-wear operation and precise force detection, along with anti-rotation features and visual feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a stroke-free or short-stroke actuation device is used without mechanical coupling, then device complexity is reduced and adaptability is improved, but measurement precision deteriorates due to lack of precise stroke detection
Solution Approach 1:
The patent replaces mechanical coupling with magnetic coupling between the actuation device and the sensor system. The magnetic field transmission enables force detection without direct mechanical contact, thus maintaining stroke-free or short-stroke operation while preserving measurement precision through electromagnetic interaction rather than mechanical linkage.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the actuation device and the sensor system. This magnetic intermediary transmits the actuation force information without requiring direct mechanical contact, enabling precise measurement while maintaining the benefits of stroke-free operation and reduced mechanical complexity.
2Reliability
If stroke-free actuation is implemented, then reliability is improved by reducing wear, but manufacturing precision requirements increase due to tight tolerance needs
Solution Approach 1:
The patent replaces direct mechanical contact with magnetic field interaction, eliminating the need for precision-machined mechanical interfaces. The magnetic coupling system tolerates greater dimensional variations while maintaining reliable force transmission, thus reducing manufacturing precision requirements while preserving the wear-free benefits of stroke-free actuation.
3Adaptability or versatility
If mechanical coupling is eliminated, then adaptability is improved for brake-by-wire systems, but loss of information occurs due to inability to directly detect actuation stroke
Solution Approach 1:
The patent substitutes mechanical stroke detection with magnetic field-based force sensing. By measuring the magnetic interaction forces, the system can infer actuation information without mechanical coupling, thus maintaining adaptability for brake-by-wire systems while preventing information loss through alternative sensing mechanisms.
Solution Approach 2:
The patent implements a feedback mechanism where the sensor system continuously monitors magnetic field interactions and provides real-time information about actuation forces. This feedback loop compensates for the lack of direct mechanical stroke detection, ensuring complete information availability for brake-by-wire control while maintaining system adaptability.
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 design enables precise detection of driver inputs with reduced wear and improved reliability, providing secure mounting and visual feedback, thus enhancing the accuracy and durability of brake and acceleration requests in motor vehicles.
Implementation Method 1
a sliding bearing element (10) is arranged within the projection (8) or between the projection (8) and the guide receptacle (9). The sliding bearing element advantageously ensures that the two housing portions are guided together in a low-wear manner.
Data Source
AI summary
An actuation device for a motor vehicle, in particular for specifying a braking and/or acceleration request, includes a first housing portion which is slidably mounted on a second housing portion in a vertical extension of the second housing portion. The first housing portion includes an actuating surface on a top surface facing away from the second housing portion, or a cover having the actuating surface is arranged on the top surface. The first housing portion includes a bar-shaped projection on an inner side facing the second housing portion. Further, the second housing portion includes a guide receptacle for the projection for the guided, slidable mounting of the first housing portion on the second housing portion.