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Rover: use throttle_min param as output deadzone

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This commit is contained in:
Randy Mackay 2018-03-26 16:25:43 +09:00
parent 2b2c1e2d78
commit fa20fd695f
1 changed files with 17 additions and 10 deletions
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27
APMrover2/AP_MotorsUGV.cpp
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@ -47,7 +47,7 @@ const AP_Param::GroupInfo AP_MotorsUGV::var_info[] = {
// @Param: THR_MIN
// @DisplayName: Throttle minimum
// @Description: Throttle minimum percentage the autopilot will apply. This is mostly useful for rovers with internal combustion motors, to prevent the motor from cutting out in auto mode.
// @Description: Throttle minimum percentage the autopilot will apply. This is useful for handling a deadzone around low throttle and for preventing internal combustion motors cutting out during missions.
// @Units: %
// @Range: 0 20
// @Increment: 1
@ -157,13 +157,6 @@ void AP_MotorsUGV::set_throttle(float throttle)
// check throttle is between -_throttle_max ~ +_throttle_max but outside -throttle_min ~ +throttle_min
_throttle = constrain_float(throttle, -_throttle_max, _throttle_max);
if ((_throttle_min > 0) && (fabsf(_throttle) < _throttle_min)) {
if (is_negative(_throttle)) {
_throttle = -_throttle_min;
} else {
_throttle = _throttle_min;
}
}
}
/*
@ -501,10 +494,24 @@ void AP_MotorsUGV::set_limits_from_input(bool armed, float steering, float throt
limit.throttle_upper = !armed || (throttle >= _throttle_max);
}
// scale a throttle using the _thrust_curve_expo parameter. throttle should be in the range -100 to +100
// scale a throttle using the _throttle_min and _thrust_curve_expo parameters. throttle should be in the range -100 to +100
float AP_MotorsUGV::get_scaled_throttle(float throttle) const
{
// return immediatley if no scaling
// exit immediately if throttle is zero
if (is_zero(throttle)) {
return throttle;
}
// scale using throttle_min
if (_throttle_min > 0) {
if (is_negative(throttle)) {
throttle = -_throttle_min + (throttle * ((100.0f - _throttle_min) / 100.0f));
} else {
throttle = _throttle_min + (throttle * ((100.0f - _throttle_min) / 100.0f));
}
}
// skip further scaling if thrust curve disabled or invalid
if (is_zero(_thrust_curve_expo) || (_thrust_curve_expo > 1.0f) || (_thrust_curve_expo < -1.0f)) {
return throttle;
}