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heater.c: Limit PID I term with conditional integration.

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This commit is contained in:
David Forrest 2014-03-31 03:16:00 -04:00
parent f00a202246
commit c9b8435749
1 changed files with 8 additions and 1 deletions
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9
Marlin/temperature.cpp
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@ -455,7 +455,14 @@ void manage_heater()
//K1 defined in Configuration.h in the PID settings //K1 defined in Configuration.h in the PID settings
#define K2 (1.0-K1) #define K2 (1.0-K1)
dTerm[e] = (Kd * (pid_input - temp_dState[e]))*K2 + (K1 * dTerm[e]); dTerm[e] = (Kd * (pid_input - temp_dState[e]))*K2 + (K1 * dTerm[e]);
pid_output = constrain(pTerm[e] + iTerm[e] - dTerm[e], 0, PID_MAX); pid_output = pTerm[e] + iTerm[e] - dTerm[e];
if (pid_output > PID_MAX) {
if (pid_error[e] > 0 ) temp_iState[e] -= pid_error[e]; // conditional un-integration
pid_output=PID_MAX;
} else if (pid_output < 0){
if (pid_error[e] < 0 ) temp_iState[e] -= pid_error[e]; // conditional un-integration
pid_output=0;
}
} }
temp_dState[e] = pid_input; temp_dState[e] = pid_input;
#else #else