Electro-Hydraulic Brake Isolated Circuits and Split Valves
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Solution Overview
Problem
The existing electro-hydraulic brake systems face instability and insufficient braking force due to oil leakage, leading to increased braking distance and safety concerns, as continuous oil leakage reduces the oil quantity available for the motor, causing the pressure generating unit to fail in providing sufficient braking force.
Innovation Solution
The implementation of isolated circuits with split valves and an oil reservoir divided by partition walls to prevent oil mixing and ensure a minimum oil quantity, allowing the system to isolate affected circuits and maintain braking stability by redirecting oil pressure through operational circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isolated circuits with split valves are implemented, then braking stability is improved, but device complexity increases
Solution Approach 1:
The brake system is divided into multiple isolated circuits (first circuit and second circuit), each with its own split valve (first split valve and second split valve). This segmentation allows independent control and isolation of each circuit, preventing oil leakage in one circuit from affecting the other, thereby improving braking stability while managing complexity through modular design
Solution Approach 2:
The oil reservoir acts as an intermediary component that receives oil from both circuits and supplies it to the pressure generating unit. The partition wall within the reservoir creates separate storage regions for each circuit's oil, maintaining circuit isolation while enabling centralized oil management and pressure generation
2Quantity of substance
If oil reservoir is divided by partition walls, then oil quantity is maintained, but manufacturing complexity increases
Solution Approach 1:
The oil reservoir is divided into first and second regions by a partition wall, creating separate storage spaces for oil from each circuit. This segmentation ensures that each circuit maintains its minimum required oil quantity independently, preventing oil depletion due to leakage in the other circuit while using a relatively simple internal partition structure
Solution Approach 2:
Despite the internal partition, both oil regions are merged into a single integrated reservoir component that connects to both circuits and the pressure generating unit. This merging approach maintains manufacturing simplicity compared to using completely separate reservoirs, while still achieving the goal of maintaining adequate oil quantity through isolated storage regions
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 ensures braking stability and sufficient braking force by isolating affected circuits and maintaining a minimum oil quantity, preventing oil mixing and ensuring continuous operation even with oil leakage, thus enhancing safety and reducing braking distance.
Implementation Method 1
a pump, which converts rotating force into linear force when a motor is driven to move a piston in front and rear directions, and forms oil pressure by the piston pressurizing braking oil within a chamber of a cylinder
Implementation Method 2
for each oil supply line, a split valve is installed in a connection portion of the pressure generating unit and the oil supply line, and when the split valve is closed, the split valve blocks the braking oil pressure supplied from the pressure generating unit to the oil supply line
Implementation Method 3
an oil reservoir configured to store braking oil, and connected to the oil supply lines to provide the braking oil to the oil supply lines
Data Source
AI summary
Disclosed are electro-hydraulic brake system and control method. The system may include a braking input unit to provide a braking input according to an operation of a driver, a control unit to control generation of braking oil pressure according to the braking input of the braking input unit, a pressure generating unit to generate the braking oil pressure, wheel clamping units to generate braking forces to corresponding wheels, and oil supply lines to transfer the braking oil pressure to corresponding wheel clamping units. Each oil supply line is fluidly connected to the pressure generating unit. For each oil supply line, a split valve is installed in a connection portion of the pressure generating unit and the oil supply line. When the split valve is closed, the split valve blocks the braking oil pressure supplied from the pressure generating unit to the oil supply line.