Brake Pressure Control With Threshold-Based Circuit Isolation
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Solution Overview
Problem
Existing braking systems for vehicles with two braking devices per wheel face issues of uniform actuation and safety, where hydraulic leakage leads to system failure, affecting both braking devices and compromising safety.
Innovation Solution
A pressure control device that independently controls the actuating pressures of two braking devices, maintaining fluid separation below a threshold pressure to prevent failure impact and aligning pressures above the threshold for uniform actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two braking devices are hydraulically connected to the same pressure chamber, then uniform braking action and wear conditions are achieved, but hydraulic leakage causes system failure and compromises safety
Solution Approach 1:
The hydraulic system is segmented into two independent circuits (first circuit and second circuit), each with its own pressure chamber, allowing one circuit to fail without affecting the other. This segmentation resolves the contradiction by maintaining safety through independence while preserving uniform braking through pressure equalization when both circuits are functional.
Solution Approach 2:
A pressure equalization mechanism acts as an intermediary between the two independent hydraulic circuits, allowing pressure to be balanced when both circuits are above threshold pressure. This mediator enables uniform braking action without requiring direct fluid connection, thus maintaining safety while achieving uniformity.
2Reliability
If two braking devices are hydraulically connected to the same pressure chamber, then uniform actuating conditions are achieved, but pressure loss occurs due to hydraulic leakage
Solution Approach 1:
The hydraulic system is divided into two separate circuits with independent pressure chambers, preventing pressure loss in one circuit from affecting the other. This segmentation isolates leakage issues to individual circuits while maintaining overall system reliability and preventing catastrophic pressure loss.
Solution Approach 2:
The system incorporates a threshold pressure mechanism that prevents pressure equalization when either circuit is below threshold pressure, effectively cushioning against pressure loss by maintaining isolation until both circuits are sufficiently pressurized, thereby preventing further pressure degradation.
3Reliability
If two braking devices are kept fluidly separated, then safety is improved in case of failure, but wear differences and non-uniform braking action occur
Solution Approach 1:
The fluid connection between the two circuits is made dynamic rather than static - it is established or removed based on threshold pressure conditions. This dynamic adjustment allows the system to maintain uniform braking when both circuits are functional while ensuring safety isolation when one circuit fails, resolving the contradiction between uniformity and safety.
Solution Approach 2:
The system changes the parameter of fluid connectivity based on pressure parameters - when both circuits are above threshold pressure, fluid connection is established for uniformity; when either drops below threshold, connection is removed for safety. This parameter-based control resolves the contradiction adaptively.
4Ease of operation
If a single braking circuit actuates two braking devices, then uniform braking action is achieved, but failure of one device affects the operation of the other
Solution Approach 1:
The single braking circuit is segmented into two independent circuits, each actuating one braking device. This segmentation provides independence so that failure of one device does not affect the other, while the pressure equalization mechanism restores uniform braking action when both circuits are functional.
Solution Approach 2:
The pressure equalization mechanism serves multiple functions: it enables uniform braking when both circuits are operational and maintains circuit isolation when one fails. This multi-functionality resolves the contradiction by adapting the system behavior to different operational states.
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
Ensures safe and uniform braking by isolating braking devices during failures, preventing pressure loss and maintaining consistent actuation, thus enhancing safety and reducing wear differences.
Implementation Method 1
a first elastic element (22) and a second elastic element (24)
Implementation Method 2
a first circuit (2) comprising a first pressure chamber of a brake actuating device (103) to pressurize the first circuit fluid at a first circuit pressure P1
Data Source
Figure 1
Figure 2
Figure 3a~3d
AI summary
The present invention relates to a pressure control device (1) for a braking system (100), comprising : a device body (4) partially delimiting at least a first circuit side opening (9), at least a second circuit side opening (61), and at least one conduit (8) putting said at least a first circuit side opening (9) and said at least a second circuit side opening (61) in fluid communication, wherein said at least one conduit (8) comprises at least a first conduit portion (12) and at least a second conduit portion (13), wherein the first conduit portion (12) is fluidly connectable to a first circuit (2) to receive a first circuit fluid at a first circuit pressure (P1), wherein the second conduit portion (13) is fluidly connectable to a second circuit (3) to receive a second circuit fluid at a second circuit pressure (P2), a pressure control mechanism (5) configured to control the first circuit pressure (P1) and/ or the second circuit pressure (P2) to reach an actuating pressure (Pa), wherein said pressure control mechanism (5) is housed at least partially in said conduit (8), wherein when at least one of said first circuit pressure (P1) and said second circuit pressure (P2) is lower than a threshold pressure (Ps), said pressure control mechanism (5) is configured to prevent fluid passages between said first conduit portion (12) and said second conduit portion (13), or vice versa, so as to sustain at least one of said first circuit pressure (P1) and said second circuit pressure (P2) which is higher than said threshold pressure (P2) up to said actuating pressure (Pa) to actuate either the first braking device (101) or the second braking device (102) and when the first circuit pressure (P1) and the second circuit pressure (P2) are both higher than a threshold pressure (Ps), said pressure control mechanism (5) is configured to fluidly connect the first conduit portion (12) and the second conduit portion (13), so as to align said first circuit pressure (P1) and said second circuit pressure (P2) with said threshold pressure (Pa) to actuate the first braking device (101) and the second braking device (102) with said actuating pressure (Pa).