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@@ -27,15 +27,7 @@ MAX_LAT_JERK_UP = 2.5 # m/s^3
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LOW_SPEED_X = [0, 10, 20, 30]
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LOW_SPEED_Y = [15, 13, 10, 5]
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KP = 1.0
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KI = 0.1
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KD = 0.3
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# filter jerk and measurement rate with cutoff frequency equal ~0.5 jerk up limit
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LP_FILTER_CUTOFF_HZ = 1.2
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JERK_LOOKAHEAD_SECONDS = 0.19
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JERK_GAIN = 0.3
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LAT_ACCEL_REQUEST_BUFFER_SECONDS = 1.0
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class LatControlTorque(LatControl):
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def __init__(self, CP, FPCP, CI, dt):
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@@ -43,15 +35,14 @@ class LatControlTorque(LatControl):
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self.torque_params = FPCP.lateralTuning.torque
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self.torque_from_lateral_accel = CI.torque_from_lateral_accel()
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self.lateral_accel_from_torque = CI.lateral_accel_from_torque()
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self.pid = PIDController(KP, KI, KD, rate=1/self.dt)
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self.pid = PIDController(self.torque_params.kp, self.torque_params.ki,
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k_f=self.torque_params.kf, rate=1/self.dt)
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self.update_limits()
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self.steering_angle_deadzone_deg = self.torque_params.steeringAngleDeadzoneDeg
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self.lookahead_frames = int(JERK_LOOKAHEAD_SECONDS / self.dt)
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self.lat_accel_request_buffer_len = int(LAT_ACCEL_REQUEST_BUFFER_SECONDS / self.dt)
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self.lat_accel_request_buffer = deque([0.] * self.lat_accel_request_buffer_len , maxlen=self.lat_accel_request_buffer_len)
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self.jerk_filter = FirstOrderFilter(0.0, 1 / (2 * np.pi * LP_FILTER_CUTOFF_HZ), dt=self.dt)
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self.measurement_rate_filter = FirstOrderFilter(0.0, 1 / (2 * np.pi * LP_FILTER_CUTOFF_HZ), dt=self.dt)
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self.LATACCEL_REQUEST_BUFFER_NUM_FRAMES = int(1 / self.dt)
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self.requested_lateral_accel_buffer = deque([0.] * self.LATACCEL_REQUEST_BUFFER_NUM_FRAMES , maxlen=self.LATACCEL_REQUEST_BUFFER_NUM_FRAMES)
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self.previous_measurement = 0.0
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self.measurement_rate_filter = FirstOrderFilter(0.0, 1 / (2 * np.pi * (MAX_LAT_JERK_UP - 0.5)), self.dt)
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# FrogPilot variables
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self.nnff = NeuralNetworkFeedforward(CP, self)
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@@ -79,24 +70,22 @@ class LatControlTorque(LatControl):
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curvature_deadzone = abs(VM.calc_curvature(math.radians(self.steering_angle_deadzone_deg), CS.vEgo, 0.0))
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lateral_accel_deadzone = curvature_deadzone * CS.vEgo ** 2
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delay_frames = int(np.clip(lat_delay / self.dt, 1, self.lat_accel_request_buffer_len))
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expected_lateral_accel = self.lat_accel_request_buffer[-delay_frames]
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lookahead_idx = int(np.clip(-delay_frames + self.lookahead_frames, -self.lat_accel_request_buffer_len+1, -2))
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raw_lateral_jerk = (self.lat_accel_request_buffer[lookahead_idx+1] - self.lat_accel_request_buffer[lookahead_idx-1]) / (2 * self.dt)
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desired_lateral_jerk = self.jerk_filter.update(raw_lateral_jerk)
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delay_frames = int(np.clip(lat_delay / self.dt, 1, self.LATACCEL_REQUEST_BUFFER_NUM_FRAMES))
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expected_lateral_accel = self.requested_lateral_accel_buffer[-delay_frames]
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# TODO factor out lateral jerk from error to later replace it with delay independent alternative
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future_desired_lateral_accel = desired_curvature * CS.vEgo ** 2
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self.lat_accel_request_buffer.append(future_desired_lateral_accel)
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self.requested_lateral_accel_buffer.append(future_desired_lateral_accel)
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gravity_adjusted_future_lateral_accel = future_desired_lateral_accel - roll_compensation
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desired_lateral_jerk = (future_desired_lateral_accel - expected_lateral_accel) / lat_delay
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measurement = measured_curvature * CS.vEgo ** 2
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measurement_rate = self.measurement_rate_filter.update((measurement - self.previous_measurement) / self.dt)
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self.previous_measurement = measurement
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low_speed_factor = (np.interp(CS.vEgo, LOW_SPEED_X, LOW_SPEED_Y_NN if frogpilot_toggles.nnff else LOW_SPEED_Y) / max(CS.vEgo, MIN_SPEED)) ** 2
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setpoint = expected_lateral_accel
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setpoint = lat_delay * desired_lateral_jerk + expected_lateral_accel
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error = setpoint - measurement
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error_lsf = error + low_speed_factor / KP * error
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error_lsf = error + low_speed_factor / self.torque_params.kp * error
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if self.nnff_loaded and frogpilot_toggles.nnff or frogpilot_toggles.nnff_lite:
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pid_log, ff = self.nnff.compute_nnff(
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@@ -115,10 +104,15 @@ class LatControlTorque(LatControl):
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ff = gravity_adjusted_future_lateral_accel
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# latAccelOffset corrects roll compensation bias from device roll misalignment relative to car roll
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ff -= self.torque_params.latAccelOffset
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ff += get_friction(error + JERK_GAIN * desired_lateral_jerk, lateral_accel_deadzone, FRICTION_THRESHOLD, self.torque_params)
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# TODO jerk is weighted by lat_delay for legacy reasons, but should be made independent of it
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ff += get_friction(error, lateral_accel_deadzone, FRICTION_THRESHOLD, self.torque_params)
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freeze_integrator = steer_limited_by_safety or CS.steeringPressed or CS.vEgo < 5
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output_lataccel = self.pid.update(pid_log.error, -measurement_rate, CS.vEgo, ff, freeze_integrator)
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output_lataccel = self.pid.update(pid_log.error,
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-measurement_rate,
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feedforward=ff,
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speed=CS.vEgo,
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freeze_integrator=freeze_integrator)
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output_torque = self.torque_from_lateral_accel(output_lataccel, self.torque_params)
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pid_log.active = True
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@@ -129,7 +123,6 @@ class LatControlTorque(LatControl):
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pid_log.output = float(-output_torque) # TODO: log lat accel?
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pid_log.actualLateralAccel = float(measurement)
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pid_log.desiredLateralAccel = float(setpoint)
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pid_log.desiredLateralJerk= float(desired_lateral_jerk)
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pid_log.saturated = bool(self._check_saturation(self.steer_max - abs(output_torque) < 1e-3, CS, steer_limited_by_safety, curvature_limited))
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# TODO left is positive in this convention
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