Master Cylinder Stiffness Reducer for Hydraulic Brake Vibration
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Solution Overview
Problem
Hydraulic braking systems experience vibrations in the upstream portion of the slip control device, which can lead to reduced accuracy in controlling hydraulic pressures in brake cylinders, affecting the stability and efficiency of the braking system.
Innovation Solution
A hydraulic braking system with a stiffness reducer in the upstream portion, specifically a master cylinder configuration that includes a pressurizing piston with a front and rear pressure chamber, and a rearward chamber stiffness reducer to reduce stiffness and absorb vibrations, allowing for improved control of hydraulic pressures during slip control operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the stiffness in the upstream portion is reduced to absorb vibrations, then the accuracy of hydraulic pressure control is improved, but the system becomes more complex due to the additional stiffness reducer component
Solution Approach 1:
The stiffness reducer is integrated into the master cylinder by utilizing the rearward chamber as part of the compliance mechanism. The master cylinder's piston and chambers are merged with the stiffness reducer functionality, where the rearward chamber volume changes provide the compliance effect without requiring a separate standalone stiffness reducer component.
Solution Approach 2:
The master cylinder is designed to perform multiple functions: it generates hydraulic pressure through piston movement while simultaneously acting as a stiffness reducer through its rearward chamber compliance. This multi-functionality allows the same component to both pressurize the hydraulic system and absorb vibrations, reducing overall system complexity.
2Stability of the object's composition
If a separate damper is added to suppress vibrations, then the stability of hydraulic pressure is improved, but the system size increases
Solution Approach 1:
The vibration suppression function traditionally requiring a separate damper is merged into the master cylinder structure. The rearward chamber of the master cylinder serves dual purposes: generating hydraulic pressure and providing vibration suppression through its compliance, thereby eliminating the need for an additional damper component and reducing system size.
Solution Approach 2:
The master cylinder is designed as a multi-functional component that simultaneously performs pressure generation and vibration suppression. The rearward chamber's ability to expand and contract provides compliance that absorbs hydraulic pressure vibrations, making the master cylinder a universal component that replaces both the traditional master cylinder and separate damper.
3Measurement precision
If the stiffness in the upstream portion is reduced to absorb vibrations, then the accuracy of slip control is improved, but the force transmission capability is reduced
Solution Approach 1:
The stiffness of the upstream portion is made dynamic rather than static. The rearward chamber compliance provides variable stiffness that adapts to operating conditions: under normal braking conditions, the chamber maintains sufficient stiffness for force transmission, while during slip control operations, the chamber can expand to absorb vibrations and improve control accuracy.
Solution Approach 2:
The physical parameter of stiffness in the upstream portion is changed based on operational requirements. The rearward chamber volume and pressure conditions are adjusted to provide appropriate compliance during slip control while maintaining adequate force transmission during normal braking, effectively changing the stiffness parameter dynamically.
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 reduced stiffness in the upstream portion effectively absorbs vibrations, enhancing the accuracy and stability of hydraulic pressure control in brake cylinders, thereby improving the overall performance of the hydraulic braking system without the need for additional dampers, which reduces system size and cost.
Implementation Method 1
a stiffness reducer configured to reduce stiffness in an upstream portion located upstream of the slip control device such that the stiffness is less in a case where the slip control device is in an operating state than in a case where the slip control device is in a non-operating state
Data Source
AI summary
Vibrations of a hydraulic pressure in an upstream portion due to operations of a slip control device during anti-lock control are transmitted to a control pressure chamber via a pressurizing piston of a master cylinder and a control piston of a regulator. During anti-lock control, in contrast, a pressure-increase linear valve and a pressure-reduction linear valve are opened, allowing change in volume of the control pressure chamber, resulting in reduction in stiffness. This reduction suppresses vibrations of a hydraulic pressure in the control pressure chamber, resulting in suppression of vibrations of a hydraulic pressure in a front pressure chamber. As a result, it is possible to reduce the lowering in control accuracy for a hydraulic pressure in a brake cylinder in anti-lock control using the hydraulic pressure in the front pressure chamber, which can well avoid a long braking distance.