64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
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// Copyright (c) 2020 Computer Vision Center (CVC) at the Universitat Autonoma
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// de Barcelona (UAB).
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//
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// This work is licensed under the terms of the MIT license.
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// For a copy, see <https://opensource.org/licenses/MIT>.
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#pragma once
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#include <algorithm>
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#include "carla/trafficmanager/Constants.h"
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#include "carla/trafficmanager/DataStructures.h"
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namespace carla {
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namespace traffic_manager {
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namespace chr = std::chrono;
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using namespace constants::PID;
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using TimeInstance = chr::time_point<chr::system_clock, chr::nanoseconds>;
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namespace PID {
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/// This function calculates the actuation signals based on the resent state
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/// change of the vehicle to minimize PID error.
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inline ActuationSignal RunStep(StateEntry present_state,
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StateEntry previous_state,
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const std::vector<float> &longitudinal_parameters,
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const std::vector<float> &lateral_parameters) {
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// Longitudinal PID calculation.
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const float expr_v =
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longitudinal_parameters[0] * present_state.velocity_deviation +
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longitudinal_parameters[1] * (present_state.velocity_deviation + previous_state.velocity_deviation) * DT +
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longitudinal_parameters[2] * (present_state.velocity_deviation - previous_state.velocity_deviation) * INV_DT;
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float throttle;
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float brake;
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if (expr_v > 0.0f) {
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throttle = std::min(expr_v, MAX_THROTTLE);
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brake = 0.0f;
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} else {
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throttle = 0.0f;
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brake = std::min(std::abs(expr_v), MAX_BRAKE);
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}
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// Lateral PID calculation.
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float steer =
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lateral_parameters[0] * present_state.angular_deviation +
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lateral_parameters[1] * (present_state.angular_deviation + previous_state.angular_deviation) * DT +
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lateral_parameters[2] * (present_state.angular_deviation - previous_state.angular_deviation) * INV_DT;
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steer = std::max(previous_state.steer - MAX_STEERING_DIFF, std::min(steer, previous_state.steer + MAX_STEERING_DIFF));
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steer = std::max(-MAX_STEERING, std::min(steer, MAX_STEERING));
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return ActuationSignal{throttle, brake, steer};
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}
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} // namespace PID
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} // namespace traffic_manager
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} // namespace carla
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