Brake Pedal Stroke Sensing via Deformation Member for Abnormal Operation
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Solution Overview
Problem
Existing vehicle brake systems face safety issues due to weak points in the detection lever of the pedal sensor, leading to inaccurate detection of abnormal rotational strokes, which can result in failure to stop the vehicle when the brake pedal is operated abnormally.
Innovation Solution
A brake device with a brake pedal, a lever, a housing, a reaction force generator, a deformation member, and a stroke sensor that generates a reaction force and outputs a signal for abnormal operation, ensuring the vehicle stops even when the deformation member is deformed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a detection lever is used to detect abnormal rotational stroke of the brake pedal, then the brake system can detect abnormal operations, but the detection lever has weak points that lead to inaccurate detection and failure to stop the vehicle
Solution Approach 1:
The patent extracts the detection function from a complex lever mechanism and implements it through a simpler deformation member that directly deforms under abnormal pedal stroke, eliminating weak points in traditional lever structures while maintaining detection capability
Solution Approach 2:
The patent changes the detection parameter from rotational stroke measurement using a lever to direct deformation measurement using a deformation member, where the deformation amount directly correlates with abnormal pedal operation, improving reliability without adding complexity
2Ease of operation
If the deformation member is deformed by force from the lever during normal operation, then the reaction force generator can generate reaction force, but the deformation portion may be accidentally deformed leading to false abnormal operation detection
Solution Approach 1:
The patent applies local quality by creating a specific deformation portion with controlled mechanical properties in the deformation member, where only this localized area deforms under abnormal conditions while other parts maintain structural integrity for normal reaction force generation
Solution Approach 2:
The patent implements preliminary action by pre-configuring the deformation member with a specific deformation portion that has predetermined deformation characteristics, allowing it to distinguish between normal operational forces and abnormal pedal stroke forces before detection occurs
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 system improves vehicle safety by accurately detecting abnormal brake pedal operations and initiating appropriate control measures to stop the vehicle, enhancing safety by preventing unintended non-stop scenarios.
Implementation Method 1
a deformation member (95) including a deformation portion (953) that is deformed by a force received from the lever (812) when the brake pedal (81) is operated
Data Source
AI summary
A brake device includes: a brake pedal including a pedal and a lever that rotates about a rotation axis when the pedal is operated; a housing that rotatably supports the lever; a reaction force generator that generates a reaction force to the lever in accordance with a stroke amount of the brake pedal by receiving a force from the lever when the brake pedal is operated; a deformation member including a deformation portion that is deformed by a force received from the lever when the brake pedal is operated in a state where the reaction force generated by the reaction force generator is generated; and a stroke sensor that outputs a signal corresponding to the stroke amount and outputs a value indicating that operation of the brake pedal is abnormal and instructing execution of control for stopping a vehicle when the deformation portion is deformed.