Brake Pedal Feel Simulator With Adjustable Electromechanical Stiffness
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Solution Overview
Problem
Existing Brake-By-Wire (BBW) braking systems lack the ability to adjust and customize the stiffness curve of the brake pedal without complete redesign, suffer from mechanical instability, and fail to provide tactile feedback like conventional systems.
Innovation Solution
A braking feel simulator device using an electromechanical opposition device with an electric motor and screw-nut screw assembly to adjust the stiffness curve and provide tactile feedback, allowing customization without redesign, and incorporating an electric motor to apply varying mechanical torque for different driving styles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If coil springs are used to simulate brake pedal stiffness, then the stiffness curve can be replicated, but the device cannot be adjusted or customized without complete redesign
Solution Approach 1:
The patent replaces static mechanical spring elements with a dynamic electromechanical actuator that can actively adjust the stiffness curve in real-time. The actuator receives control signals to modify the reaction force characteristics, enabling the brake pedal to adapt to different driving styles (city, highway, sport) without any physical redesign of the simulator device structure.
Solution Approach 2:
The invention changes the physical parameters of the stiffness curve by controlling the electromechanical actuator's output force characteristics. Through electronic control, the system can vary the reaction force magnitude and stiffness profile dynamically, allowing customization of brake pedal feel without altering the mechanical structure of the simulator device.
2Reliability
If multiple elastic elements are arranged in series and parallel to achieve desired stiffness, then the stiffness curve can be shaped, but mechanical tolerances cause instabilities and variations over time
Solution Approach 1:
The patent replaces the mechanical spring-based stiffness generation system with an electromechanical actuator. This substitution eliminates the accumulation of mechanical tolerances from multiple elastic elements, as the actuator generates the reaction force through controlled electromagnetic fields and mechanical transmission, providing consistent and stable stiffness characteristics over time without degradation from mechanical wear or tolerance variations.
Solution Approach 2:
The electromechanical actuator incorporates sensors and control electronics that continuously monitor and adjust the reaction force output. This self-regulating capability compensates for any drift or variation, maintaining stable stiffness curve characteristics without requiring precise mechanical tolerances in the physical components.
3Loss of information
If conventional hydraulic braking systems are used, then tactile feedback like brake pedal trembling during ABS intervention is provided, but BBW systems lack this tactile signal feedback
Solution Approach 1:
The patent implements a feedback mechanism where the electromechanical actuator receives control signals that instruct it to generate specific reaction force patterns corresponding to tactile feedback events. When ABS intervention is detected, the control system commands the actuator to produce brake pedal trembling or vibration sensations, faithfully reproducing the tactile feedback experience of conventional hydraulic systems and maintaining driver awareness of braking system activity.
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 device provides adjustable and stable stiffness curves, mimicking conventional braking system feedback, enhancing driver experience and system efficiency.
Implementation Method 1
an electromechanical opposition device (5), in particular an electric motor (6), configured to apply a mechanical opposing torque
Implementation Method 2
a screw-nut screw assembly (8), configured to translate a nut screw (10) along an actuation axis (13)
Data Source
AI summary
A braking feel simulator device for a braking system adapted to be connected to a brake pedal has a thrust piston and an electromechanical opposition device. The thrust piston is configured to be biased in translation against the electromechanical opposition device in response to an actuation of the brake pedal. The electromechanical opposition device is configured to oppose a translation of the thrust piston.