ardupilot/ArduCopter/crash_check.cpp

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#include "Copter.h"
// Code to detect a crash main ArduCopter code
#define CRASH_CHECK_TRIGGER_SEC 2 // 2 seconds inverted indicates a crash
#define CRASH_CHECK_ANGLE_DEVIATION_DEG 30.0f // 30 degrees beyond angle max is signal we are inverted
#define CRASH_CHECK_ACCEL_MAX 3.0f // vehicle must be accelerating less than 3m/s/s to be considered crashed
// crash_check - disarms motors if a crash has been detected
// crashes are detected by the vehicle being more than 20 degrees beyond it's angle limits continuously for more than 1 second
// called at MAIN_LOOP_RATE
void Copter::crash_check()
{
static uint16_t crash_counter; // number of iterations vehicle may have been crashed
// return immediately if disarmed, or crash checking disabled
if (!motors.armed() || ap.land_complete || g.fs_crash_check == 0) {
crash_counter = 0;
return;
}
// return immediately if we are not in an angle stabilize flight mode or we are flipping
if (control_mode == ACRO || control_mode == FLIP) {
crash_counter = 0;
return;
}
// vehicle not crashed if 1hz filtered acceleration is more than 3m/s (1G on Z-axis has been subtracted)
if (land_accel_ef_filter.get().length() >= CRASH_CHECK_ACCEL_MAX) {
crash_counter = 0;
return;
}
// check for angle error over 30 degrees
const float angle_error = attitude_control.get_att_error_angle_deg();
if (angle_error <= CRASH_CHECK_ANGLE_DEVIATION_DEG) {
crash_counter = 0;
return;
}
// we may be crashing
crash_counter++;
// check if crashing for 2 seconds
if (crash_counter >= (CRASH_CHECK_TRIGGER_SEC * scheduler.get_loop_rate_hz())) {
// log an error in the dataflash
Log_Write_Error(ERROR_SUBSYSTEM_CRASH_CHECK, ERROR_CODE_CRASH_CHECK_CRASH);
// send message to gcs
gcs_send_text(MAV_SEVERITY_EMERGENCY,"Crash: Disarming");
// disarm motors
init_disarm_motors();
}
}
#if PARACHUTE == ENABLED
// Code to detect a crash main ArduCopter code
#define PARACHUTE_CHECK_TRIGGER_SEC 1 // 1 second of loss of control triggers the parachute
#define PARACHUTE_CHECK_ANGLE_DEVIATION_CD 3000 // 30 degrees off from target indicates a loss of control
// parachute_check - disarms motors and triggers the parachute if serious loss of control has been detected
// vehicle is considered to have a "serious loss of control" by the vehicle being more than 30 degrees off from the target roll and pitch angles continuously for 1 second
// called at MAIN_LOOP_RATE
void Copter::parachute_check()
{
static uint16_t control_loss_count; // number of iterations we have been out of control
static int32_t baro_alt_start;
// exit immediately if parachute is not enabled
if (!parachute.enabled()) {
return;
}
// call update to give parachute a chance to move servo or relay back to off position
parachute.update();
// return immediately if motors are not armed or pilot's throttle is above zero
if (!motors.armed()) {
control_loss_count = 0;
return;
}
// return immediately if we are not in an angle stabilize flight mode or we are flipping
if (control_mode == ACRO || control_mode == FLIP) {
control_loss_count = 0;
return;
}
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// ensure we are flying
if (ap.land_complete) {
control_loss_count = 0;
return;
}
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// ensure the first control_loss event is from above the min altitude
if (control_loss_count == 0 && parachute.alt_min() != 0 && (current_loc.alt < (int32_t)parachute.alt_min() * 100)) {
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return;
}
// check for angle error over 30 degrees
const float angle_error = attitude_control.get_att_error_angle_deg();
if (angle_error <= CRASH_CHECK_ANGLE_DEVIATION_DEG) {
if (control_loss_count > 0) {
control_loss_count--;
}
return;
}
// increment counter
if (control_loss_count < (PARACHUTE_CHECK_TRIGGER_SEC*scheduler.get_loop_rate_hz())) {
control_loss_count++;
}
// record baro alt if we have just started losing control
if (control_loss_count == 1) {
baro_alt_start = baro_alt;
// exit if baro altitude change indicates we are not falling
} else if (baro_alt >= baro_alt_start) {
control_loss_count = 0;
return;
// To-Do: add check that the vehicle is actually falling
// check if loss of control for at least 1 second
} else if (control_loss_count >= (PARACHUTE_CHECK_TRIGGER_SEC*scheduler.get_loop_rate_hz())) {
// reset control loss counter
control_loss_count = 0;
// log an error in the dataflash
Log_Write_Error(ERROR_SUBSYSTEM_CRASH_CHECK, ERROR_CODE_CRASH_CHECK_LOSS_OF_CONTROL);
// release parachute
parachute_release();
}
}
// parachute_release - trigger the release of the parachute, disarm the motors and notify the user
void Copter::parachute_release()
{
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// send message to gcs and dataflash
gcs_send_text(MAV_SEVERITY_INFO,"Parachute: Released");
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Log_Write_Event(DATA_PARACHUTE_RELEASED);
// disarm motors
init_disarm_motors();
// release parachute
parachute.release();
// deploy landing gear
landinggear.set_cmd_mode(LandingGear_Deploy);
}
// parachute_manual_release - trigger the release of the parachute, after performing some checks for pilot error
// checks if the vehicle is landed
void Copter::parachute_manual_release()
{
// exit immediately if parachute is not enabled
if (!parachute.enabled()) {
return;
}
// do not release if vehicle is landed
// do not release if we are landed or below the minimum altitude above home
if (ap.land_complete) {
// warn user of reason for failure
gcs_send_text(MAV_SEVERITY_INFO,"Parachute: Landed");
// log an error in the dataflash
Log_Write_Error(ERROR_SUBSYSTEM_PARACHUTE, ERROR_CODE_PARACHUTE_LANDED);
return;
}
// do not release if we are landed or below the minimum altitude above home
if ((parachute.alt_min() != 0 && (current_loc.alt < (int32_t)parachute.alt_min() * 100))) {
// warn user of reason for failure
gcs_send_text(MAV_SEVERITY_ALERT,"Parachute: Too low");
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// log an error in the dataflash
Log_Write_Error(ERROR_SUBSYSTEM_PARACHUTE, ERROR_CODE_PARACHUTE_TOO_LOW);
return;
}
// if we get this far release parachute
parachute_release();
}
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#endif // PARACHUTE == ENABLED