Controller Output Switch-Off Testing With Adaptive Test Pulses
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing systems face challenges in efficiently determining whether outputs can be switched off, particularly due to diverse load properties requiring manual adjustment of test pulse durations, which is inefficient and potentially disruptive to connected loads.
Innovation Solution
A method and apparatus that systematically test the switchability of outputs by applying test pulses of increasing durations until the output voltage or current meets predetermined criteria, transitioning to a safe state if criteria are not met within a maximum time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If test pulses of fixed duration are used to test output switchability, then the testing process is simple, but the commissioning engineer must manually determine and set suitable test pulse durations for diverse loads, which is inefficient and potentially disruptive
Solution Approach 1:
The test pulse duration is made dynamic rather than fixed. The control unit automatically adjusts the test pulse duration based on real-time measurement of the output signal characteristics. For loads with slower response characteristics, longer test pulses are applied, while faster loads receive shorter test pulses, eliminating the need for manual configuration and reducing overall testing time.
Solution Approach 2:
The system incorporates feedback by continuously measuring the output signal during the test pulse and using this information to determine whether the output can be switched off. The measurement unit monitors the output signal level and provides feedback to the control unit, which then decides whether to extend the test pulse or terminate the test routine, creating a closed-loop testing process.
2Reliability
If longer test pulses are applied to ensure reliable detection of switch failure, then the detection reliability improves, but the disruption to connected loads increases
Solution Approach 1:
The test pulse duration is dynamically adjusted based on the actual load response characteristics. The system applies the minimum necessary test pulse duration to achieve reliable detection, avoiding unnecessarily long pulses that would disrupt the load. The control unit monitors the output signal and terminates the test routine as soon as sufficient evidence is obtained, minimizing overall disruption time.
Solution Approach 2:
The system changes the test pulse parameter (duration) based on the measured output signal characteristics. By adapting the pulse duration to the actual load response, the system achieves reliable detection without applying excessive disruption. The parameter adjustment is automatic and based on real-time measurements of the output signal level during the test.
3Device complexity
If manual determination of test pulse duration is required, then the system complexity is low, but the commissioning engineer is burdened with determining and setting suitable test pulse durations for diverse loads
Solution Approach 1:
The system performs self-testing without requiring manual configuration by the commissioning engineer. The control unit automatically determines appropriate test pulse durations by monitoring the output signal characteristics in real-time. The system serves itself by adapting the test parameters based on the actual load, eliminating the burden of manual determination while maintaining low overall system complexity through automated control.
Solution Approach 2:
The control unit uses feedback from the measurement unit to automatically adjust test pulse parameters. The feedback loop continuously monitors the output signal during testing and uses this information to determine when to extend or terminate the test routine, eliminating the need for manual configuration while maintaining simple system architecture through automated control logic.
Data Source
AI summary
An apparatus and a method for testing whether an output can be switched off during a test routine. A switch is opened which connects a voltage or current source to the output for a first time period. During at least a part of the first time period, a voltage or a current output is measured and the switch is closed at the end of the first time period. The voltage or current curve measured during the first time period is assessed based on one or more predetermined criteria which serve as an indication of whether the output can be switched off and, if the one or more predetermined criteria are met, the test routine is terminated and, if the one or more predetermined criteria are not met, the test routine is continued by opening the switch for a second time period which is longer than the first time period.