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Copter: parachute check uses lean angle error of 30deg

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Also slightly restructured
This commit is contained in:
Randy Mackay 2015-06-18 10:48:54 +09:00
parent 4154ecdf18
commit 8f95bc3b67
1 changed files with 32 additions and 37 deletions
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69
ArduCopter/crash_check.cpp
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@ -4,7 +4,7 @@
// Code to detect a crash main ArduCopter code // Code to detect a crash main ArduCopter code
#define CRASH_CHECK_TRIGGER_SEC 2 // 2 seconds inverted indicates a crash #define CRASH_CHECK_TRIGGER_SEC 2 // 2 seconds inverted indicates a crash
#define CRASH_CHECK_ANGLE_DEVIATION_CD 2000 // 20 degrees beyond angle max is signal we are inverted #define CRASH_CHECK_ANGLE_DEVIATION_CD 3000.0f // 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 #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 // crash_check - disarms motors if a crash has been detected
@ -34,7 +34,7 @@ void Copter::crash_check()
// check for angle error over 30 degrees // check for angle error over 30 degrees
const Vector3f angle_error = attitude_control.angle_bf_error(); const Vector3f angle_error = attitude_control.angle_bf_error();
if (pythagorous2(angle_error.x, angle_error.y) <= 3000.0f) { if (pythagorous2(angle_error.x, angle_error.y) <= CRASH_CHECK_ANGLE_DEVIATION_CD) {
crash_counter = 0; crash_counter = 0;
return; return;
} }
@ -98,42 +98,37 @@ void Copter::parachute_check()
return; return;
} }
// get desired lean angles // check for angle error over 30 degrees
const Vector3f& target_angle = attitude_control.angle_ef_targets(); const Vector3f angle_error = attitude_control.angle_bf_error();
if (pythagorous2(angle_error.x, angle_error.y) <= CRASH_CHECK_ANGLE_DEVIATION_CD) {
// check roll and pitch angles
if (labs(ahrs.roll_sensor - target_angle.x) > CRASH_CHECK_ANGLE_DEVIATION_CD ||
labs(ahrs.pitch_sensor - target_angle.y) > CRASH_CHECK_ANGLE_DEVIATION_CD) {
control_loss_count++;
// don't let control_loss_count get too high
if (control_loss_count > (PARACHUTE_CHECK_TRIGGER_SEC*MAIN_LOOP_RATE)) {
control_loss_count = (PARACHUTE_CHECK_TRIGGER_SEC*MAIN_LOOP_RATE);
}
// 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*MAIN_LOOP_RATE)) {
// 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();
}
}else{
// we are not inverted so reset counter
control_loss_count = 0; control_loss_count = 0;
return;
}
// increment counter
if (control_loss_count < (PARACHUTE_CHECK_TRIGGER_SEC*MAIN_LOOP_RATE)) {
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*MAIN_LOOP_RATE)) {
// 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();
} }
} }