how can solve breakingpoint in simulink ?

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ADNAN KIRAL
ADNAN KIRAL 2018-12-14
评论： ADNAN KIRAL 2018-12-15
hi,
I am using SIMULINK, and I keep seeing this error
"The problem occurs at element 3. Change the breakpoints data or use the fixed-point tools such as Auto Scaling or Fixed-Point Advisor to determine a different parameter dialog type".
when i change "cp1,cp2,cp3,cp4" in my code :
i saw this problem
By the way,
my max step size=0.02;
min step size= auto
relative tolerance=1e-3
absolute tolerance=auto
solver=ode45, variable step
er=40;
cp1=0.833*10^6; cp2=1.67*10^6; cp3=7.84*10^6; cp4=14.7*10^6;
lookup_in=[0 (cp1+cp2)/2 (cp1+cp2)/2+er*eps (cp2+cp3)/2 ...
(cp2+cp3)/2+er*eps (cp3+cp4)/2 (cp3+cp4)/2+er*eps 100];
lookup_out=[cp1 cp1 cp2 cp2 cp3 cp3 cp4 cp4];
can anyone please help me with that ?
thanks in advance,

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采纳的回答

Fangjun Jiang
Fangjun Jiang 2018-12-14
The values in lookup_in must be monotonically increasing. Right now it is not.
The third value is not regarded as larger than the second value becuase the difference is so small. The resolution must have been lost. The last value (100) is also problematic.
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Fangjun Jiang
Fangjun Jiang 2018-12-14
The output should not be affected.
A better way is to specify
lookup_in2=[0 (cp1+cp2)/2 (cp2+cp3)/2 (cp3+cp4)/2]
lookup_out2=[cp1 cp2 cp3 cp4]
And specify the "Interpolation method" as "Flat" in the "Algorithm" panel of the lookup table block.

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