Select-High Valve Testing via Brake Circuit Pressure Comparison
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Solution Overview
Problem
In autonomous vehicles, the functionality of the select-high valve in electro-pneumatic brake systems cannot be reliably monitored without additional sensor systems, which is costly.
Innovation Solution
A method and brake system that utilize existing pressure detection devices in the main and service brake circuits to ascertain the functionality of the select-high valve by comparing pressures and switching states, eliminating the need for additional sensors in the secondary supply circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional sensor systems are used to monitor the select-high valve functionality, then the reliability of monitoring is improved, but the cost increases
Solution Approach 1:
The brake system uses its own existing pressure detection devices to monitor the select-high valve functionality, eliminating the need for additional dedicated sensors. The system essentially monitors itself using resources already present in the brake system architecture.
Solution Approach 2:
The existing pressure detection devices, originally designed for general brake system monitoring, are utilized for the additional function of detecting select-high valve position. This multi-functional use of existing components avoids adding dedicated sensors while maintaining monitoring capability.
2Measurement precision
If additional sensor systems are installed in the secondary supply circuit, then the measurement precision of valve position is improved, but the device complexity and cost increase
Solution Approach 1:
The brake system uses its own existing pressure detection devices to monitor the select-high valve functionality, eliminating the need for additional dedicated sensors. The system essentially monitors itself using resources already present in the brake system architecture.
Solution Approach 2:
The existing pressure detection devices serve as intermediaries that indirectly detect the select-high valve position by measuring pressure differences in the supply circuits, rather than directly sensing the valve position. This indirect measurement approach uses available components to achieve the monitoring function.
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
Enables reliable and cost-effective monitoring of the select-high valve functionality without additional sensors, ensuring safe operation of the brake system before autonomous journeys.
Implementation Method 1
first detection of a pressure in the main supply circuit by means of a first pressure detection device
Implementation Method 2
first detection of a pressure in the service brake circuit by means of a second pressure detection device
Implementation Method 3
increasing the pressure in the main supply circuit above the specified maximum pressure of the other supply circuit by means of the pressure source
Data Source
AI summary
A method for testing functionality of a brake-system's select-high valve (SHV), including: comparing the pressure in a main-supply-circuit (MSC) with the pressure in a service-brake-circuit (SBC) and ascertaining that the SBC is being supplied with pressure from the other supply-circuit (OSC) if the pressure in the SBC is higher than the pressure in the MSC; increasing the pressure in the MSC above the pressure of the OSC; comparing the pressure in the MSC with the pressure in the SBC and ascertaining that the SBC is being supplied with pressure from the MSC when the pressure in the SBC at least approximately corresponds to the pressure in the MSC; and ascertaining that the SHV is functional if it has been ascertained that the SBC is being supplied with pressure from the OSC and that the SBC is being supplied with pressure from the MSC.