Simulink Test Sequence, Time Tolerance

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Hi,
I've been using Simulink Test Sequences to run some time sensitive testing: validation that something is True for 1 second, False for 0.5 seconds, True for 5 seconds, etc.
I am having issues with this, since I am generating these "time till next transition" in my model, but validating that my calculations are correct inside of the Test Sequence (running a calculation in transition steps to find the 'same' time based of inputs). However, my "verify" statements are failing, due to failing for 0.1/0.2/0.3 seconds (the verify is starting too early/ending too late). This isnt due to a malfunction, but timing issues with inputs/state machine transitions/components reacting.
In my test cases, I'd like to set a tolerance for when these tests pass, and was wondering if there was a mechanism to do so. Ive only seen tolerances in terms of values, not in terms of time.
Thanks for the help! Zach

回答(1 个)

Khoo Yit Phang
Khoo Yit Phang 2018-2-5
Hi,
There isn't any explicit mechanism for time tolerance in Test Sequence, however, you can use the following pattern to achieve something similar (transition conditions omitted):
step_TrueFor1Second
if elapsed == 0
measured = 0;
end
measured = max(measured, duration(input1));
step_FalseForHalfSecond
if elapsed == 0
verify(abs(measured - 1.0) < 0.1, 'TrueFor1Second within 0.1 second tolerance')
measured = 0;
end
measured = max(measured, duration(input2));
step_TrueFor5Seconds
if elapsed == 0
verify(abs(measured - 0.5) < 0.1, 'TrueForHalfSecond within 0.1 second tolerance')
measured = 0;
end
measured = max(measured, duration(input3));
moreSteps
if elapsed == 0
verify(abs(measured - 5) < 0.1, 'TrueFor5Seconds within 0.1 second tolerance')
measured = 0;
end
...
The basic idea is to perform the time measurement in a step (using an auxiliary local "measured" and the "max" and "duration" functions), and verify it with tolerance at the beginning of the next step (if "elapsed == 0").
Let me know if you need further clarification of the above pattern.
Yit

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