ardupilot/libraries/AP_WheelEncoder/AP_WheelRateControl.cpp

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#include <AP_WheelEncoder/AP_WheelRateControl.h>
extern const AP_HAL::HAL& hal;
const AP_Param::GroupInfo AP_WheelRateControl::var_info[] = {
// @Param: _ENABLE
// @DisplayName: Wheel rate control enable/disable
// @Description: Enable or disable wheel rate control
// @Values: 0:Disabled,1:Enabled
// @User: Standard
AP_GROUPINFO_FLAGS("_ENABLE", 1, AP_WheelRateControl, _enabled, 0, AP_PARAM_FLAG_ENABLE),
// @Param: _RATE_MAX
// @DisplayName: Wheel max rotation rate
// @Description: Wheel max rotation rate
// @Units: rad/s
// @Range: 0 200
// @User: Standard
AP_GROUPINFO("_RATE_MAX", 2, AP_WheelRateControl, _rate_max, AP_WHEEL_RATE_MAX_DEFAULT),
// @Param: _RATE_FF
// @DisplayName: Wheel rate control feed forward gain
// @Description: Wheel rate control feed forward gain. Desired rate (in radians/sec) is multiplied by this constant and output to output (in the range -1 to +1)
// @Range: 0.100 2.000
// @User: Standard
// @Param: _RATE_P
// @DisplayName: Wheel rate control P gain
// @Description: Wheel rate control P gain. Converts rate error (in radians/sec) to output (in the range -1 to +1)
// @Range: 0.100 2.000
// @User: Standard
// @Param: _RATE_I
// @DisplayName: Wheel rate control I gain
// @Description: Wheel rate control I gain. Corrects long term error between the desired rate (in rad/s) and actual
// @Range: 0.000 2.000
// @User: Standard
// @Param: _RATE_IMAX
// @DisplayName: Wheel rate control I gain maximum
// @Description: Wheel rate control I gain maximum. Constrains the output (range -1 to +1) that the I term will generate
// @Range: 0.000 1.000
// @User: Standard
// @Param: _RATE_D
// @DisplayName: Wheel rate control D gain
// @Description: Wheel rate control D gain. Compensates for short-term change in desired rate vs actual
// @Range: 0.000 0.400
// @User: Standard
// @Param: _RATE_FILT
// @DisplayName: Wheel rate control filter frequency
// @Description: Wheel rate control input filter. Lower values reduce noise but add delay.
// @Range: 1.000 100.000
// @Units: Hz
// @User: Standard
// @Param: _RATE_FLTT
// @DisplayName: Wheel rate control target frequency in Hz
// @Description: Wheel rate control target frequency in Hz
// @Range: 1 50
// @Increment: 1
// @Units: Hz
// @User: Standard
// @Param: _RATE_FLTE
// @DisplayName: Wheel rate control error frequency in Hz
// @Description: Wheel rate control error frequency in Hz
// @Range: 1 50
// @Increment: 1
// @Units: Hz
// @User: Standard
// @Param: _RATE_FLTD
// @DisplayName: Wheel rate control derivative frequency in Hz
// @Description: Wheel rate control derivative frequency in Hz
// @Range: 1 50
// @Increment: 1
// @Units: Hz
// @User: Standard
AP_SUBGROUPINFO(_rate_pid0, "_RATE_", 3, AP_WheelRateControl, AC_PID),
// @Param: 2_RATE_FF
// @DisplayName: Wheel rate control feed forward gain
// @Description: Wheel rate control feed forward gain. Desired rate (in radians/sec) is multiplied by this constant and output to output (in the range -1 to +1)
// @Range: 0.100 2.000
// @User: Standard
// @Param: 2_RATE_P
// @DisplayName: Wheel rate control P gain
// @Description: Wheel rate control P gain. Converts rate error (in radians/sec) to output (in the range -1 to +1)
// @Range: 0.100 2.000
// @User: Standard
// @Param: 2_RATE_I
// @DisplayName: Wheel rate control I gain
// @Description: Wheel rate control I gain. Corrects long term error between the desired rate (in rad/s) and actual
// @Range: 0.000 2.000
// @User: Standard
// @Param: 2_RATE_IMAX
// @DisplayName: Wheel rate control I gain maximum
// @Description: Wheel rate control I gain maximum. Constrains the output (range -1 to +1) that the I term will generate
// @Range: 0.000 1.000
// @User: Standard
// @Param: 2_RATE_D
// @DisplayName: Wheel rate control D gain
// @Description: Wheel rate control D gain. Compensates for short-term change in desired rate vs actual
// @Range: 0.000 0.400
// @User: Standard
// @Param: 2_RATE_FILT
// @DisplayName: Wheel rate control filter frequency
// @Description: Wheel rate control input filter. Lower values reduce noise but add delay.
// @Range: 1.000 100.000
// @Units: Hz
// @User: Standard
// @Param: 2_RATE_FLTT
// @DisplayName: Wheel rate control target frequency in Hz
// @Description: Wheel rate control target frequency in Hz
// @Range: 1 50
// @Increment: 1
// @Units: Hz
// @User: Standard
// @Param: 2_RATE_FLTE
// @DisplayName: Wheel rate control error frequency in Hz
// @Description: Wheel rate control error frequency in Hz
// @Range: 1 50
// @Increment: 1
// @Units: Hz
// @User: Standard
// @Param: 2_RATE_FLTD
// @DisplayName: Wheel rate control derivative frequency in Hz
// @Description: Wheel rate control derivative frequency in Hz
// @Range: 1 50
// @Increment: 1
// @Units: Hz
// @User: Standard
AP_SUBGROUPINFO(_rate_pid1, "2_RATE_", 4, AP_WheelRateControl, AC_PID),
AP_GROUPEND
};
AP_WheelRateControl::AP_WheelRateControl(const AP_WheelEncoder &wheel_encoder_ref) :
_wheel_encoder(wheel_encoder_ref)
{
AP_Param::setup_object_defaults(this, var_info);
}
// returns true if a wheel encoder and rate control PID are available for this instance
bool AP_WheelRateControl::enabled(uint8_t instance)
{
// sanity check instance
if ((instance > 1) || (_enabled == 0)) {
return false;
}
// wheel encoder enabled
return _wheel_encoder.enabled(instance);
}
// get throttle output in the range -100 to +100 given a desired rate expressed as a percentage of the rate_max (-100 to +100)
// instance can be 0 or 1
float AP_WheelRateControl::get_rate_controlled_throttle(uint8_t instance, float desired_rate_pct, float dt)
{
if (!enabled(instance)) {
return 0;
}
// determine which PID instance to use
AC_PID& rate_pid = (instance == 0) ? _rate_pid0 : _rate_pid1;
// set PID's dt
rate_pid.set_dt(dt);
// check for timeout
uint32_t now = AP_HAL::millis();
if (now - _last_update_ms > AP_WHEEL_RATE_CONTROL_TIMEOUT_MS) {
rate_pid.reset_filter();
rate_pid.reset_I();
_limit[instance].lower = false;
_limit[instance].upper = false;
}
_last_update_ms = now;
// convert desired rate as a percentage to radians/sec
float desired_rate = desired_rate_pct / 100.0f * get_rate_max_rads();
// get actual rate from wheeel encoder
float actual_rate = _wheel_encoder.get_rate(instance);
// constrain and set limit flags
float output = rate_pid.update_all(desired_rate, actual_rate, (_limit[instance].lower || _limit[instance].upper));
output += rate_pid.get_ff();
// set limits for next iteration
_limit[instance].upper = output >= 100.0f;
_limit[instance].lower = output <= -100.0f;
return output;
}
// get pid objects for reporting
AC_PID& AP_WheelRateControl::get_pid(uint8_t instance)
{
if (instance == 0) {
return _rate_pid0;
} else {
return _rate_pid1;
}
}