Vehicle Brake Device Regulating Valve Noise Control
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Solution Overview
Problem
The existing vehicle brake devices that use a pressure reducing valve to regulate brake fluid pressure suffer from pulsation and potential abnormal noise, particularly when there is a large difference in hydraulic pressure, leading to discomfort and noise issues.
Innovation Solution
A vehicle brake device with a regulating valve and a pressure reducing valve that continuously adjusts the flow rate and pressure of brake fluid, using solenoid valves to intermittently open and close, and maintaining the pressure reducing valve open when reducing hydraulic brake force, while another valve reduces pressure to an accumulator when increasing regenerative brake force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a pressure reducing valve is used to regulate brake fluid pressure by opening and closing, then the brake fluid pressure can be reduced, but pulsation and abnormal noise occur due to the large difference in hydraulic pressure
Solution Approach 1:
The patent applies dynamics by transitioning from a static on/off valve control to a dynamic continuous flow rate regulation. The pressure reducing valve continuously adjusts the flow rate of brake fluid in accordance with a command value, enabling smooth pressure reduction without sudden changes that cause water hammer and pulsation. This dynamic control eliminates the harmful noise and vibration associated with abrupt valve switching.
Solution Approach 2:
The patent implements parameter changes by controlling the valve opening degree as a variable parameter rather than a binary state. The pressure reducing valve's opening degree is continuously adjusted based on command values to regulate brake fluid flow rate smoothly. This continuous parameter adjustment prevents the large pressure differential that causes water hammer effect and abnormal noise.
2Use of energy by moving object
If the regenerative brake force is increased to improve energy efficiency, then the ratio of regenerative brake is increased, but the hydraulic brake force must be reduced which causes brake fluid pressure reduction
Solution Approach 1:
The patent applies parameter changes by continuously adjusting the pressure reducing valve's opening degree in response to regenerative brake force variations. When regenerative brake force increases and hydraulic brake force needs to be reduced, the valve opening is smoothly adjusted to reduce brake fluid pressure gradually, maintaining energy efficiency while avoiding pressure shock and noise.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining continuous pressure reduction control throughout the braking process. As the regenerative brake force changes, the pressure reducing valve continuously adjusts the hydraulic brake force without interruption or abrupt changes, ensuring smooth energy transition and preventing harmful pressure fluctuations.
3Extent of automation
If a solenoid valve is used to control brake fluid flow, then the valve can be opened and closed intermittently, but this causes pulsation in the brake fluid
Solution Approach 1:
The patent replaces the intermittent mechanical on/off valve control with a continuously controllable valve system. Instead of using solenoid valves that switch between open and closed states, the system employs a pressure reducing valve that can be precisely controlled to maintain continuous, smooth brake fluid flow, eliminating pulsation while retaining automated control capabilities.
Solution Approach 2:
The patent applies dynamics by transforming the static intermittent valve operation into dynamic continuous flow regulation. The pressure reducing valve's opening degree is continuously adjusted based on real-time command values, creating a dynamic control system that maintains stable brake fluid flow without the pulsation caused by intermittent valve switching.
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
This solution prevents abnormal noise and pulsation by gradually adjusting brake fluid pressure, ensuring a smooth braking experience and reducing the likelihood of noise caused by water hammer.
Implementation Method 1
a pressure reducing valve that reduces the pressure of the brake fluid supplied to the second of the hydraulic brakes
Implementation Method 2
a regulating valve that is provided between a first and a second of the hydraulic brakes and continuously regulates the flow rate of brake fluid flowing to the second of the hydraulic brakes from the first of the hydraulic brakes
Implementation Method 3
pumps brake fluid from the accumulator using a motor pump unit, which is electrically controlled, when increasing hydraulic pressure
Data Source
AI summary
An object of the invention is to prevent abnormal noise from being generated when the pressure of brake fluid supplied to a brake caliper is reduced. A vehicle brake device includes first and second hydraulic brakes generating a hydraulic brake force and a regenerative brake generating a regenerative brake force and divides a braking force into the hydraulic brake force and the regenerative brake force. The vehicle brake device includes a regulating valve that is provided between the first and second hydraulic brakes and continuously regulates the flow rate of brake fluid flowing to the second hydraulic brake from the first hydraulic brake, and a pressure reducing valve that reduces the pressure of the brake fluid supplied to the second hydraulic brake. An opening of the regulating valve is continuously increased and the pressure reducing valve is opened, when the hydraulic brake force of the first hydraulic brake is reduced.