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Merge branch 'pid_fix' of github.com:PX4/Firmware

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Lorenz Meier
2013-09-02 08:05:09 +02:00
parent bda85d54e4 e553087d10
commit 38f9c25e93
1 changed files with 10 additions and 6 deletions
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16
src/modules/systemlib/pid/pid.c
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@@ -51,6 +51,8 @@
#include "pid.h"
#include <math.h>
#define SIGMA 0.000001f
__EXPORT void pid_init(PID_t *pid, float kp, float ki, float kd, float intmax,
float limit, uint8_t mode, float dt_min)
{
@@ -168,8 +170,8 @@ __EXPORT float pid_calculate(PID_t *pid, float sp, float val, float val_dot, flo
// Calculate the error integral and check for saturation
i = pid->integral + (error * dt);
if (fabsf((error * pid->kp) + (i * pid->ki) + (d * pid->kd)) > pid->limit ||
fabsf(i) > pid->intmax) {
if ((pid->limit > SIGMA && (fabsf((error * pid->kp) + (i * pid->ki) + (d * pid->kd)) > pid->limit)) ||
fabsf(i) > pid->intmax) {
i = pid->integral; // If saturated then do not update integral value
pid->saturated = 1;
@@ -186,11 +188,13 @@ __EXPORT float pid_calculate(PID_t *pid, float sp, float val, float val_dot, flo
float output = (error * pid->kp) + (i * pid->ki) + (d * pid->kd);
if (isfinite(output)) {
if (output > pid->limit) {
output = pid->limit;
if (pid->limit > SIGMA) {
if (output > pid->limit) {
output = pid->limit;
} else if (output < -pid->limit) {
output = -pid->limit;
} else if (output < -pid->limit) {
output = -pid->limit;
}
}
pid->last_output = output;