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ACM: Broke out the D term for the PID loop to add custom filtering. The current AC_PID filtering wasn't working for this application and we needed more smoothing. Bad pitch oscillations were being transmitted to the copter.

This commit is contained in:
Jason Short 2012-03-11 23:21:33 -07:00
parent 5c3cb1c5d0
commit 56d2b9ef05
1 changed files with 34 additions and 17 deletions
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45
ArduCopter/navigation.pde
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@ -82,6 +82,12 @@ static void calc_XY_velocity(){
static void calc_location_error(struct Location *next_loc)
{
static int16_t last_lon_error = 0;
static int16_t last_lat_error = 0;
static int16_t last_lon_d = 0;
static int16_t last_lat_d = 0;
/*
Becuase we are using lat and lon to do our distance errors here's a quick chart:
100 = 1m
@ -96,12 +102,32 @@ static void calc_location_error(struct Location *next_loc)
// Y Error
lat_error = next_loc->lat - current_loc.lat; // 500 - 0 = 500 Go North
int16_t tmp;
tmp = (long_error - last_lon_error);
if(abs(abs(tmp) -last_lon_d) > 15) tmp = x_rate_d;
x_rate_d = lon_rate_d_filter.apply(tmp);
last_lon_d = abs(tmp);
tmp = (lat_error - last_lat_error);
if(abs(abs(tmp) -last_lat_d) > 15) tmp = y_rate_d;
//if(abs(tmp) > 80) tmp = y_rate_d;
y_rate_d = lat_rate_d_filter.apply(tmp);
last_lat_d = abs(tmp);
int16_t t22 = x_rate_d * (g.pid_loiter_rate_lon.kD() / dTnav);
int16_t raww = (long_error - last_lon_error);
//Serial.printf("XX, %d, %d, %d\n", raww, x_rate_d, t22);
last_lon_error = long_error;
last_lat_error = lat_error;
}
#define NAV_ERR_MAX 600
static void calc_loiter(int x_error, int y_error)
{
#if LOITER_RATE == 1
int16_t x_target_speed, y_target_speed;
//int16_t x_iterm, y_iterm;
@ -109,31 +135,22 @@ static void calc_loiter(int x_error, int y_error)
x_target_speed = g.pi_loiter_lon.get_p(x_error); // not contstrained yet
//x_target_speed = constrain(x_target_speed, -250, 250); // limit to 2.5m/s travel speed
x_rate_error = x_target_speed - x_actual_speed; // calc the speed error
nav_lon = g.pid_loiter_rate_lon.get_pid(x_rate_error, dTnav);
nav_lon = g.pid_loiter_rate_lon.get_pi(x_rate_error, dTnav);
nav_lon -= x_rate_d * (g.pid_loiter_rate_lon.kD() / dTnav);
nav_lon = constrain(nav_lon, -3000, 3000); // 30°
// North / South
y_target_speed = g.pi_loiter_lat.get_p(y_error);
//y_target_speed = constrain(y_target_speed, -250, 250);
y_rate_error = y_target_speed - y_actual_speed;
nav_lat = g.pid_loiter_rate_lat.get_pid(y_rate_error, dTnav);
nav_lat = g.pid_loiter_rate_lat.get_pi(y_rate_error, dTnav);
nav_lat -= y_rate_d * (g.pid_loiter_rate_lat.kD() / dTnav);
nav_lat = constrain(nav_lat, -3000, 3000); // 30°
// copy over I term to Nav_Rate
g.pid_nav_lon.set_integrator(g.pid_loiter_rate_lon.get_integrator());
g.pid_nav_lat.set_integrator(g.pid_loiter_rate_lat.get_integrator());
#else
// no rate control on Loiter
nav_lon = g.pid_loiter_rate_lon.get_pid(x_error, dTnav);
nav_lat = g.pid_loiter_rate_lat.get_pid(y_error, dTnav);
nav_lon = constrain(nav_lon, -3000, 3000); // 30°
nav_lat = constrain(nav_lat, -3000, 3000); // 30°
#endif
// Wind I term based on location error,
// limit windup