EBS Redundancy Pressure Control via Subsystem Isolation
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Solution Overview
Problem
Commercial vehicle pressure medium supply systems face issues with pressure regulation during EBS brake system failures, leading to potential damage from excessive pressure to brake cylinders, and existing solutions like venting devices have limited pressure reduction rates and affect all consumers equally.
Innovation Solution
The method involves separating subsystems with their own reservoirs from the pressure medium supply device during redundancy, blocking pressure supply to non-defective subsystems to maintain existing pressure levels, and adjusting pressure regulator switch-off pressures to prevent excessive pressure, using overflow valves to manage pressure replenishment and reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the pressure in the pressure medium reservoir is increased to satisfy short-term compressed air needs, then the storage capacity is improved, but the risk of damaging brake cylinders increases
Solution Approach 1:
A common control electronics unit acts as an intermediary between the pressure medium supply device and the brake system. It receives error messages from the EBS control unit and autonomously controls the pressure medium supply device to reduce pressure when EBS malfunction is detected, preventing direct damage to brake cylinders while maintaining high storage pressure capability
Solution Approach 2:
The system implements feedback control where the common control electronics continuously monitors error messages from the EBS control unit and adjusts the pressure medium supply device accordingly. When EBS malfunction is detected, the feedback loop triggers automatic pressure reduction to protect the brake system
2Object-affected harmful factors
If a venting device is used to reduce excess pressure in the pressure medium reservoir, then the pressure damage risk is reduced, but the pressure reduction rate is limited and all consumers are affected
Solution Approach 1:
The system segments the control of pressure reduction by introducing a common control electronics unit that can independently manage the pressure medium supply device. This segmented control allows selective and rapid pressure reduction in the reservoir without affecting the operational status of connected consumers, overcoming the limitations of traditional venting devices
Solution Approach 2:
The patent replaces the mechanical venting device with an electronically controlled pressure medium supply device managed by common control electronics. This substitution enables faster, more precise pressure reduction control compared to mechanical venting, improving the pressure reduction rate while maintaining safety
3Reliability
If a direct connection is established between the pressure fluid reservoir and the service brake cylinder for redundancy braking, then the braking reliability is improved, but the service brake cylinder may be pressurized with unsuitably high pressure leading to damage
Solution Approach 1:
The system dynamically adjusts the pressure control strategy based on EBS operational status. When EBS is functional, normal dynamic pressure control is used. When EBS malfunctions, the common control electronics switches to a protective mode that dynamically limits pressure to safe levels, maintaining braking reliability through the direct connection while preventing overpressure damage
Data Source
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AI summary
The method involves providing a redundancy pressure for braking a commercial motor vehicle by a redundancy circuit. Pressure in a pressure medium storage container (28, 30), which is attached to a failed control circuit (88, 90), is adjusted to a non-overloading value for an attached brake cylinder (24, 26). A consumer-side sub-system e.g. retarder system, attached to a sub-system connection of a pressure medium supply device (32), is separated by a storage container (100) from the device in order to prevent pressure adjustment in the sub-system in the case of redundancy. An independent claim is also included for a device for controlling a pressure medium supply device of a commercial motor vehicle.