Pedal Simulator With Differing Piston Diameters
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Solution Overview
Problem
Conventional pedal simulators provide a fixed pedal feeling due to predetermined spring performance, limiting the ability to adjust the stroke distance and reaction force, which cannot meet the varied requirements of different drivers or vehicles.
Innovation Solution
A pedal feeling adjusting device with pistons of different diameters arranged in series, where oil pressure is selectively supplied through a hydraulic valve, allowing for adjustable pedal stroke distance and reaction force by controlling the flow path, providing a hard or soft pedal feeling based on the diameter of the piston engaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single spring is used in the pedal simulator, then the structure is simple, but the pedal feeling cannot be adjusted and is limited to a linear primary straight line
Solution Approach 1:
The single spring is divided into two springs with different stiffness coefficients arranged in parallel. This segmentation allows the system to provide different reaction forces at different pedal stroke positions, enabling adjustable pedal feeling while maintaining a relatively simple structure.
Solution Approach 2:
The pedal simulator transitions from a static single-spring system to a dynamic two-spring system where the effective stiffness changes based on the pedal stroke position. The first spring engages at initial stroke positions while the second spring engages at larger stroke positions, creating a dynamically adjustable reaction force characteristic.
2Adaptability or versatility
If the spring performance is predetermined, then the manufacturing is simple, but the pedal feeling of the driver cannot be adjusted
Solution Approach 1:
The pedal simulator is designed with a universal structure that can accommodate different spring combinations. By selecting different stiffness coefficients for the two springs, the same basic structure can be adapted to provide different pedal feelings suitable for various driver preferences and vehicle types, making the system multi-functional.
Solution Approach 2:
The system allows adjustment of pedal feeling by changing the physical parameters of the springs, specifically the stiffness coefficients. By selecting springs with different stiffness values, the reaction force characteristics can be modified without changing the overall structure, enabling parameter-based adaptation.
3Adaptability or versatility
If two springs with different stiffness coefficients are arranged in parallel, then adjustable pedal feeling is achieved, but the structure becomes more complex
Solution Approach 1:
The two springs with different stiffness coefficients are merged into a single pedal simulator assembly, working together in parallel to provide the combined reaction force. This merging allows the system to achieve adjustable pedal feeling while consolidating the components into a compact, integrated structure rather than separate assemblies.
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
Enables customizable pedal feeling by generating a large force with a short stroke for a hard feeling and a small force with a long stroke, accommodating different driver preferences and vehicle types.
Implementation Method 1
an oil pressure is selectively supplied to the pistons having mutually different diameters by changing a flow path through a hydraulic valve
Implementation Method 2
pressurized by an oil pressure according to pedal effort of the brake pedal to thereby provide a repulsive force to the brake pedal
Implementation Method 3
an elastic member supported by the damping housing and compressed in accordance with movement of the first and second pistons to provide a reaction force
Data Source
AI summary
Disclosed herein is a pedal feeling adjusting device. According to an embodiment of the present invention, the pedal feeling adjusting device that adjusts pedal feeling provided to a driver by an oil pressure generated in accordance with pedal effort of the driver, includes a pedal simulator that includes a simulator block in which an oil hole connected to a master cylinder through a flow path is formed on an upper portion thereof to receive the oil pressure in accordance with the pedal effort of the driver and bores are formed therein to contact the oil hole, a damping housing coupled to seal the bores, first and second pistons provided in series in the bores to be compressed by oil and slidably moved, and an elastic member supported by the damping housing and compressed in accordance with movement of the first and second pistons to provide a reaction force, a hydraulic flow path that is connected to the flow path to provide the oil pressure between the first and second pistons, and a control valve that is provided in the flow path to control the oil pressure to be selectively provided to the oil hole or the hydraulic flow path. Here, the first and second pistons are formed to have mutually different diameters.