Variable Pedal Feeling Adjustment via Stroke Distance Control
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Solution Overview
Problem
Conventional active hydraulic brake systems experience degraded pedal feeling during regenerative braking, leading to inconsistent braking force and potential safety issues due to the inability to adjust pedal stroke distance effectively, resulting in excessive or insufficient braking.
Innovation Solution
A variable pedal feeling adjustment device that includes a pedal simulator with a first and second reaction unit, supported by a damping housing, which adjusts the stroke distance of the reaction piston through a motor-controlled spindle, using two springs and damping members to provide sequential reaction force and prevent sudden increases in pedal effort, thereby improving pedal feeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional pedal simulator with two springs is used to provide reaction force, then the structure is simple, but the pedal feeling is degraded and cannot be adjusted
Solution Approach 1:
The patent applies dynamics by making the pedal simulator adjustable through a variable stroke distance mechanism. The reaction piston's stroke distance can be dynamically changed via an adjustment mechanism, transforming a static spring-based system into a dynamic adjustable system that provides variable pedal feeling according to different driving conditions.
Solution Approach 2:
The patent changes physical parameters by allowing adjustment of the reaction piston's stroke distance. This parameter change enables modification of the pedal feeling characteristics without changing the fundamental spring-based structure, achieving adaptability while maintaining structural simplicity.
2Power
If pressure in the master cylinder changes during regenerative braking, then hydraulic pressure is generated, but the force is directly transferred to the brake pedal causing degraded pedal feeling
Solution Approach 1:
The patent introduces an intermediary mechanism between the master cylinder and the brake pedal. The reaction piston with adjustable stroke distance acts as a mediator that decouples the direct force transfer, allowing hydraulic pressure to be generated while preventing direct transmission of pressure changes to the pedal, thus maintaining consistent pedal feeling.
Solution Approach 2:
The patent segments the force transfer path by dividing it into multiple stages: hydraulic pressure generation in the master cylinder, reaction force generation through the reaction piston with springs, and final transmission to the brake pedal. This segmentation allows independent optimization of each stage, generating necessary hydraulic pressure while filtering out harmful direct force transfers.
3Reliability
If the pedal simulator cannot adjust stroke distance, then the structure remains fixed, but excessive or insufficient braking occurs
Solution Approach 1:
The patent transforms the fixed stroke distance into a dynamic adjustable parameter. The adjustment mechanism allows the reaction piston's stroke distance to be modified based on different braking conditions, enabling the system to adapt and maintain reliable braking performance across various scenarios.
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 allows for adjustable pedal stroke distance, providing improved pedal feeling by sequentially supplying reaction force, reducing sudden increases in pedal effort, and offering a soft pedal feel, thus enhancing driver experience and safety by maintaining consistent braking performance.
Implementation Method 1
an actuator including a spindle screw-coupled to the damping housing and a motor connected to the spindle to supply rotational force to the spindle. The damping housing is moved linearly and changed in position by forward and backward rotation of the spindle.
Data Source
AI summary
Disclosed herein is a variable pedal feeling adjustment device. A pedal simulator includes a simulator block formed with an oil hole at an upper portion thereof which is connected to a master cylinder to receive hydraulic pressure caused by pedal effort of a driver and a bore which communicates with the oil hole, a first reaction unit and a second reaction unit arranged in series in the bore and configured to be pressurized sequentially by pedal effort, and a damping housing configured to support the second reaction unit and installed to a lower portion of the bore while being restricted in rotation. An actuator includes a spindle screw-coupled to the damping housing and a motor connected to the spindle to supply rotational force to the spindle. The damping housing is moved linearly and changed in position by forward and backward rotation of the spindle.