Hydraulic Switching Valve Low Opening Pressure Evacuation
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Solution Overview
Problem
Existing vehicle braking systems require high opening pressures for high-pressure switching valves, necessitating active control and additional components, which complicates automatic evacuation of the suction side of the pump and pressure accumulator during system rest phases.
Innovation Solution
A high-pressure switching valve with an opening pressure of less than 1 bar, preferably almost 0 bar, is designed without a valve spring, allowing for autonomous operation and simplifying the system by eliminating the need for external actuation, and a non-return valve with low opening pressure is used to manage pressure accumulator evacuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-pressure switching valve with high opening pressure (>2 bar) is used, then the valve can be reliably controlled with a valve spring and solenoid assembly, but the system requires active electric control and additional components, complicating automatic evacuation of the suction side
Solution Approach 1:
The patent changes the opening pressure parameter of the high-pressure switching valve from the conventional >2 bar to a reduced value. This parameter change enables the valve to open automatically at low pressures without requiring a valve spring and solenoid assembly, thereby simplifying the system structure while maintaining reliable valve operation through passive pressure-driven opening
Solution Approach 2:
The patent extracts and removes the valve spring and solenoid assembly from the high-pressure switching valve structure. This extraction eliminates the need for active electric control components, reducing device complexity and enabling automatic evacuation function while the valve body itself serves as the sole moving component actuated by pressure differential
2Ease of operation
If a valve spring and solenoid assembly are used to control the high-pressure switching valve, then the valve can be actively opened and closed, but this necessitates active control systems and additional components
Solution Approach 1:
The high-pressure switching valve is designed to operate autonomously without external control systems. The valve body opens automatically when pressure differential exceeds a threshold and closes when pressure equalizes, enabling self-service operation that eliminates the need for valve springs, solenoid assemblies, and electronic control systems, thereby reducing component quantity while maintaining switching capability
Solution Approach 2:
The patent removes the valve spring and solenoid assembly from the valve structure, extracting the active control components. This leaves only the essential valve body that operates passively based on pressure differential, reducing component quantity while preserving the fundamental valve switching function
3Extent of automation
If the opening pressure is reduced to less than 1 bar, then automatic evacuation becomes possible without electric control, but the valve requires design modifications to eliminate the valve spring
Solution Approach 1:
The patent changes the opening pressure parameter to less than 1 bar, which enables automatic evacuation without electric control. This parameter change necessitates design modifications to eliminate the valve spring, but the simplified valve body design with reduced moving parts actually eases manufacturing compared to conventional valves with multiple components
Solution Approach 2:
The patent extracts the valve spring from the valve assembly, eliminating this component to achieve the low opening pressure requirement. The valve body is redesigned to function without the spring, using only the pressure differential to actuate opening and closing, which simplifies the manufacturing process by reducing part count and assembly steps
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 enables automatic and reliable evacuation of the suction side and pressure accumulator without electric control, reducing component costs and operational complexity while maintaining system reliability.
Implementation Method 1
The opening pressure is the hydraulic pressure or fluid pressure which must be present on the suction side of the associated pump at the high-pressure switching valve in order for its valve body to lift from the associated valve seat without external influence
Implementation Method 2
a pump with a suction side for setting a brake fluid pressure in at least one associated wheel brake
Data Source
AI summary
A hydraulic device of a vehicle braking system includes a storage reservoir configured to store brake fluid. The hydraulic device further includes a pump with a suction side configured to set a brake fluid pressure in at least one associated wheel brake. The hydraulic device also includes a line connection interposed between the storage reservoir and the suction side of the pump. In addition, the hydraulic device includes a high-pressure switching valve arranged in the line connection. The high-pressure switching valve is configured to possess an opening pressure of less than 1 bar. Further, the hydraulic device includes at least one brake circuit, and the at least one brake circuit includes the pump, the line connection, and the high-pressure switching valve.