Slip-Controlled Brake Circuit Isolation Under Hydraulic Leakage
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Solution Overview
Problem
In electronically slip-controllable power braking systems, mechanical damage or leaks in one brake circuit can compromise the entire system's functionality, leading to pressure medium loss and environmental pollution, as both circuits share a common pressure generator.
Innovation Solution
A modified electronic control unit that shifts the plunger control valve of a leaking brake circuit into the passage position when the pressure generated approaches or exceeds a predetermined limit, reducing pressure medium leakage and maintaining the integrity of the intact circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the plunger control valve remains closed to maintain brake pressure, then brake pressure is maintained in the intact circuit, but pressure medium continuously leaks into the defective circuit reducing system reliability
Solution Approach 1:
The plunger control valve is dynamically switched between closed and open positions based on pressure conditions. When pressure in the defective circuit reaches a predetermined threshold, the valve automatically opens to release excess pressure medium, then closes again when pressure decreases. This dynamic operation prevents continuous leakage while maintaining brake pressure during normal operation.
Solution Approach 2:
The system uses pressure feedback from the defective brake circuit to control the plunger control valve. When pressure exceeds the predetermined value, the feedback signal triggers valve opening to release pressure medium. When pressure drops below the threshold, the valve closes to maintain pressure. This feedback mechanism automatically regulates pressure medium flow based on real-time pressure conditions.
2Loss of substance
If the plunger control valve opens to release pressure medium from the defective circuit, then pressure medium loss is reduced, but brake pressure in the intact circuit cannot be maintained
Solution Approach 1:
The plunger control valve operates periodically by opening when pressure reaches the predetermined threshold and closing when pressure decreases. This periodic opening and closing creates a pulsating pressure release pattern that gradually reduces pressure medium loss while maintaining brake pressure within acceptable ranges during the intervals when the valve is closed.
Solution Approach 2:
The system changes the pressure parameter dynamically by switching the valve state. When the valve opens, pressure in the defective circuit decreases rapidly. When the valve closes, pressure builds up again. This parameter change approach allows the system to operate in different pressure states to balance between preventing leakage and maintaining brake pressure.
3Reliability
If a leak detection method is implemented to identify defective circuits, then system reliability is improved, but device complexity increases due to additional control logic
Solution Approach 1:
The leak detection and response system operates autonomously without requiring external intervention. The electronic control unit continuously monitors pressure in both brake circuits and automatically activates the plunger control valve when a leak is detected. The system performs self-diagnosis and self-correction, improving reliability without requiring complex manual intervention systems.
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 minimizes the volume of pressure medium loss from a defective brake circuit, prolongs the availability of the intact circuit, and significantly reduces environmental pollution, without requiring additional installation space or hydraulic components.
Implementation Method 1
The pressure forces at the plunger control valve act on this closing member in an opening manner. If the pressure acting on the closing member is higher than a pressure limit establishable via the constructive valve design, the plunger control valve opens as a result
Data Source
AI summary
An electronically slip-controllable power braking system for a motor vehicle, in which a controllably drivable pressure generator supplies multiple brake circuits connected in parallel to one another with pressure medium under brake pressure. Each of the brake circuits are separable through existing first control valves from the pressure generator and include second control valves that are connected downstream from the first control valves to control the brake pressure in the wheel brakes, which are connected with the brake circuits. An electronic control unit in the brake circuits has three devices, the third device puts the first control valve of a brake circuit into a passage position if a leakage is established downstream from the second control valve in this brake circuit and if it is established that the pressure generated by the pressure generator has at least approximately reached or exceeded a pressure limit of the first control valve.