Digital Hydraulic Brake Pressure Control With Preload Response
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Solution Overview
Problem
Current hydraulic braking systems face challenges with slow pressure response and instability due to internal leakage and oil pollution, which affect braking performance, especially under heavy load and high-speed conditions, leading to safety concerns.
Innovation Solution
A digital hydraulic assisted braking system combining a two-position two-way digital switch valve, an electromagnetic two-position two-way proportional reversing valve, and a displacement/pressure detection system, with a controller managing the valves to achieve high-frequency pressure control and preload states for rapid and precise brake pressure regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a proportional valve is used for hydraulic braking control, then the braking system can achieve continuous pressure regulation, but the pressure response is slow and control accuracy is low due to median dead zone and internal leakage
Solution Approach 1:
The patent divides the continuous pressure regulation function into discrete segments by using multiple digital switch valves (first digital switch valve and second digital switch valve) that operate in sequence. Each valve controls a specific pressure range, and by combining their operations, the system achieves continuous pressure regulation while maintaining fast response and high accuracy characteristic of digital switching.
Solution Approach 2:
The patent employs periodic high-frequency switching of the digital switch valves to maintain brake pressure. The controller periodically opens and closes the valves in a predetermined sequence to sustain the desired pressure level, leveraging the rapid switching capability of digital valves to achieve both fast response and precise control.
2Ease of operation
If a proportional valve with spool structure is used, then pressure control is possible, but the system has extremely high requirements for oil cleanliness and poor reliability due to spool sticking
Solution Approach 1:
The patent extracts and eliminates the problematic spool structure from the proportional valve by replacing it with digital switch valves. The spool mechanism that is sensitive to oil contamination is completely removed, and its pressure control function is replicated using electrically controlled switching valves that have no moving parts susceptible to pollution.
Solution Approach 2:
The patent replaces the mechanical spool-based proportional valve with an electronically controlled digital switching system. The mechanical continuous adjustment mechanism is substituted with electronic control signals that actuate digital valves, eliminating the mechanical components that are vulnerable to oil contamination while maintaining pressure control capability.
3Speed
If a digital switch valve is used to improve response speed, then the frequency response is fast and control accuracy is high, but pressure fluctuation occurs in the oil tank affecting brake pressure accuracy
Solution Approach 1:
The patent segments the digital valve switching into two distinct stages: a first digital switch valve for rapid pressure building and a second digital switch valve for precise pressure maintenance. This segmentation allows the system to exploit the fast response of digital switching while using the second valve's controlled operation to minimize pressure fluctuations and maintain accuracy.
Solution Approach 2:
The patent applies preliminary action by using the first digital switch valve to quickly establish the target brake pressure before engaging the second digital switch valve for fine-tuned pressure maintenance. This preliminary rapid pressurization followed by controlled stabilization prevents oscillations and ensures accurate final pressure delivery.
4Loss of time
If emergency braking is implemented with rapid pressure build-up, then braking response time is reduced, but the system requires complex valve coordination and control mechanisms
Solution Approach 1:
The patent segments the braking response into two coordinated phases handled by separate digital switch valves: the first valve manages rapid pressure build-up for quick response, while the second valve handles pressure stabilization. This functional segmentation simplifies the control logic for each valve while achieving complex emergency braking performance through their coordinated operation.
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 system significantly reduces braking response time and enhances dynamic performance by maintaining a preload state and using high-frequency digital switch valve operations to achieve precise brake pressure control, improving safety and reliability.
Implementation Method 1
a digital switch valve as a core control element, which has a fast frequency response, and a discrete fluid generated by a high-frequency opening and closing may assimilate an effect of continuous fluid control after fusion in a pipeline
Implementation Method 2
an electromagnetic two-position two-way proportional reversing valve
Implementation Method 3
a brake fluid filling system, a first digital switch valve, a second digital switch valve, a brake caliper, and a rotor; the brake fluid filling system is respectively connected to an inlet of the first digital switch valve and an inlet of the second digital switch valve; an outlet of the first digital switch valve and an outlet of the second digital switch valve are both connected to a piston of the brake caliper
Data Source
AI summary
The present disclosure discloses a digital hydraulic assisted braking system with a high dynamic response and a control method thereof. The system includes a two-position two-way digital switch valve A, a controller, an electromagnetic two-position two-way proportional reversing valve, a two-position two-way digital switch valve B, a displacement detection system, and a pressure detection system. When a vehicle starts, a control system of the present disclosure maintains a preload state and responds to a braking at any time. During an emergency braking, the braking system is open. When the vehicle is shut down, the braking system is closed. Compared with an existing braking method, by implementing the braking method of the present disclosure, a braking response time is greatly shortened, a dynamic performance of a braking response period is improved, and a safety of vehicle braking is further guaranteed.