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210 lines
9.2 KiB
210 lines
9.2 KiB
#!/usr/bin/env python3
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import math
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import numpy as np
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from openpilot.common.numpy_fast import clip, interp
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import cereal.messaging as messaging
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from opendbc.car.interfaces import ACCEL_MIN, ACCEL_MAX
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from openpilot.common.conversions import Conversions as CV
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from openpilot.common.filter_simple import FirstOrderFilter
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from openpilot.common.realtime import DT_MDL
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from openpilot.selfdrive.modeld.constants import ModelConstants
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from openpilot.selfdrive.controls.lib.longcontrol import LongCtrlState
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from openpilot.selfdrive.controls.lib.longitudinal_mpc_lib.long_mpc import LongitudinalMpc
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from openpilot.selfdrive.controls.lib.longitudinal_mpc_lib.long_mpc import T_IDXS as T_IDXS_MPC
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from openpilot.selfdrive.controls.lib.drive_helpers import CONTROL_N, get_speed_error
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from openpilot.selfdrive.car.cruise import V_CRUISE_MAX, V_CRUISE_UNSET
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from openpilot.common.swaglog import cloudlog
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LON_MPC_STEP = 0.2 # first step is 0.2s
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A_CRUISE_MIN = -1.2
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A_CRUISE_MAX_VALS = [1.6, 1.2, 0.8, 0.6]
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A_CRUISE_MAX_BP = [0., 10.0, 25., 40.]
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CONTROL_N_T_IDX = ModelConstants.T_IDXS[:CONTROL_N]
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ALLOW_THROTTLE_THRESHOLD = 0.5
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MIN_ALLOW_THROTTLE_SPEED = 2.5
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# Lookup table for turns
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_A_TOTAL_MAX_V = [1.7, 3.2]
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_A_TOTAL_MAX_BP = [20., 40.]
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def get_max_accel(v_ego):
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return interp(v_ego, A_CRUISE_MAX_BP, A_CRUISE_MAX_VALS)
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def get_coast_accel(pitch):
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return np.sin(pitch) * -5.65 - 0.3 # fitted from data using xx/projects/allow_throttle/compute_coast_accel.py
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def limit_accel_in_turns(v_ego, angle_steers, a_target, CP):
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"""
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This function returns a limited long acceleration allowed, depending on the existing lateral acceleration
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this should avoid accelerating when losing the target in turns
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"""
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# FIXME: This function to calculate lateral accel is incorrect and should use the VehicleModel
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# The lookup table for turns should also be updated if we do this
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a_total_max = interp(v_ego, _A_TOTAL_MAX_BP, _A_TOTAL_MAX_V)
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a_y = v_ego ** 2 * angle_steers * CV.DEG_TO_RAD / (CP.steerRatio * CP.wheelbase)
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a_x_allowed = math.sqrt(max(a_total_max ** 2 - a_y ** 2, 0.))
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return [a_target[0], min(a_target[1], a_x_allowed)]
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def get_accel_from_plan(CP, speeds, accels):
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if len(speeds) == CONTROL_N:
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v_target_now = interp(DT_MDL, CONTROL_N_T_IDX, speeds)
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a_target_now = interp(DT_MDL, CONTROL_N_T_IDX, accels)
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v_target = interp(CP.longitudinalActuatorDelay + DT_MDL, CONTROL_N_T_IDX, speeds)
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if v_target != v_target_now:
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a_target = 2 * (v_target - v_target_now) / CP.longitudinalActuatorDelay - a_target_now
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else:
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a_target = a_target_now
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v_target_1sec = interp(CP.longitudinalActuatorDelay + DT_MDL + 1.0, CONTROL_N_T_IDX, speeds)
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else:
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v_target = 0.0
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v_target_1sec = 0.0
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a_target = 0.0
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should_stop = (v_target < CP.vEgoStopping and
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v_target_1sec < CP.vEgoStopping)
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return a_target, should_stop
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class LongitudinalPlanner:
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def __init__(self, CP, init_v=0.0, init_a=0.0, dt=DT_MDL):
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self.CP = CP
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self.mpc = LongitudinalMpc(dt=dt)
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self.fcw = False
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self.dt = dt
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self.allow_throttle = True
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self.a_desired = init_a
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self.v_desired_filter = FirstOrderFilter(init_v, 2.0, self.dt)
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self.v_model_error = 0.0
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self.v_desired_trajectory = np.zeros(CONTROL_N)
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self.a_desired_trajectory = np.zeros(CONTROL_N)
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self.j_desired_trajectory = np.zeros(CONTROL_N)
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self.solverExecutionTime = 0.0
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@staticmethod
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def parse_model(model_msg, model_error):
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if (len(model_msg.position.x) == ModelConstants.IDX_N and
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len(model_msg.velocity.x) == ModelConstants.IDX_N and
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len(model_msg.acceleration.x) == ModelConstants.IDX_N):
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x = np.interp(T_IDXS_MPC, ModelConstants.T_IDXS, model_msg.position.x) - model_error * T_IDXS_MPC
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v = np.interp(T_IDXS_MPC, ModelConstants.T_IDXS, model_msg.velocity.x) - model_error
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a = np.interp(T_IDXS_MPC, ModelConstants.T_IDXS, model_msg.acceleration.x)
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j = np.zeros(len(T_IDXS_MPC))
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else:
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x = np.zeros(len(T_IDXS_MPC))
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v = np.zeros(len(T_IDXS_MPC))
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a = np.zeros(len(T_IDXS_MPC))
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j = np.zeros(len(T_IDXS_MPC))
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if len(model_msg.meta.disengagePredictions.gasPressProbs) > 1:
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throttle_prob = model_msg.meta.disengagePredictions.gasPressProbs[1]
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else:
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throttle_prob = 1.0
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return x, v, a, j, throttle_prob
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def update(self, sm):
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self.mpc.mode = 'blended' if sm['selfdriveState'].experimentalMode else 'acc'
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if len(sm['carControl'].orientationNED) == 3:
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accel_coast = get_coast_accel(sm['carControl'].orientationNED[1])
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else:
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accel_coast = ACCEL_MAX
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v_ego = sm['carState'].vEgo
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v_cruise_kph = min(sm['carState'].vCruise, V_CRUISE_MAX)
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v_cruise = v_cruise_kph * CV.KPH_TO_MS
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v_cruise_initialized = sm['carState'].vCruise != V_CRUISE_UNSET
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long_control_off = sm['controlsState'].longControlState == LongCtrlState.off
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force_slow_decel = sm['controlsState'].forceDecel
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# Reset current state when not engaged, or user is controlling the speed
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reset_state = long_control_off if self.CP.openpilotLongitudinalControl else not sm['selfdriveState'].enabled
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# PCM cruise speed may be updated a few cycles later, check if initialized
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reset_state = reset_state or not v_cruise_initialized
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# No change cost when user is controlling the speed, or when standstill
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prev_accel_constraint = not (reset_state or sm['carState'].standstill)
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if self.mpc.mode == 'acc':
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accel_limits = [A_CRUISE_MIN, get_max_accel(v_ego)]
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steer_angle_without_offset = sm['carState'].steeringAngleDeg - sm['liveParameters'].angleOffsetDeg
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accel_limits_turns = limit_accel_in_turns(v_ego, steer_angle_without_offset, accel_limits, self.CP)
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else:
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accel_limits = [ACCEL_MIN, ACCEL_MAX]
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accel_limits_turns = [ACCEL_MIN, ACCEL_MAX]
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if reset_state:
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self.v_desired_filter.x = v_ego
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# Clip aEgo to cruise limits to prevent large accelerations when becoming active
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self.a_desired = clip(sm['carState'].aEgo, accel_limits[0], accel_limits[1])
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# Prevent divergence, smooth in current v_ego
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self.v_desired_filter.x = max(0.0, self.v_desired_filter.update(v_ego))
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# Compute model v_ego error
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self.v_model_error = get_speed_error(sm['modelV2'], v_ego)
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x, v, a, j, throttle_prob = self.parse_model(sm['modelV2'], self.v_model_error)
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# Don't clip at low speeds since throttle_prob doesn't account for creep
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self.allow_throttle = throttle_prob > ALLOW_THROTTLE_THRESHOLD or v_ego <= MIN_ALLOW_THROTTLE_SPEED
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if not self.allow_throttle:
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clipped_accel_coast = max(accel_coast, accel_limits_turns[0])
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clipped_accel_coast_interp = interp(v_ego, [MIN_ALLOW_THROTTLE_SPEED, MIN_ALLOW_THROTTLE_SPEED*2], [accel_limits_turns[1], clipped_accel_coast])
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accel_limits_turns[1] = min(accel_limits_turns[1], clipped_accel_coast_interp)
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if force_slow_decel:
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v_cruise = 0.0
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# clip limits, cannot init MPC outside of bounds
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accel_limits_turns[0] = min(accel_limits_turns[0], self.a_desired + 0.05)
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accel_limits_turns[1] = max(accel_limits_turns[1], self.a_desired - 0.05)
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self.mpc.set_weights(prev_accel_constraint, personality=sm['selfdriveState'].personality)
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self.mpc.set_accel_limits(accel_limits_turns[0], accel_limits_turns[1])
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self.mpc.set_cur_state(self.v_desired_filter.x, self.a_desired)
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self.mpc.update(sm['radarState'], v_cruise, x, v, a, j, personality=sm['selfdriveState'].personality)
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self.v_desired_trajectory = np.interp(CONTROL_N_T_IDX, T_IDXS_MPC, self.mpc.v_solution)
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self.a_desired_trajectory = np.interp(CONTROL_N_T_IDX, T_IDXS_MPC, self.mpc.a_solution)
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self.j_desired_trajectory = np.interp(CONTROL_N_T_IDX, T_IDXS_MPC[:-1], self.mpc.j_solution)
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# TODO counter is only needed because radar is glitchy, remove once radar is gone
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self.fcw = self.mpc.crash_cnt > 2 and not sm['carState'].standstill
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if self.fcw:
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cloudlog.info("FCW triggered")
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# Interpolate 0.05 seconds and save as starting point for next iteration
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a_prev = self.a_desired
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self.a_desired = float(interp(self.dt, CONTROL_N_T_IDX, self.a_desired_trajectory))
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self.v_desired_filter.x = self.v_desired_filter.x + self.dt * (self.a_desired + a_prev) / 2.0
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def publish(self, sm, pm):
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plan_send = messaging.new_message('longitudinalPlan')
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plan_send.valid = sm.all_checks(service_list=['carState', 'controlsState', 'selfdriveState'])
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longitudinalPlan = plan_send.longitudinalPlan
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longitudinalPlan.modelMonoTime = sm.logMonoTime['modelV2']
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longitudinalPlan.processingDelay = (plan_send.logMonoTime / 1e9) - sm.logMonoTime['modelV2']
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longitudinalPlan.solverExecutionTime = self.mpc.solve_time
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longitudinalPlan.speeds = self.v_desired_trajectory.tolist()
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longitudinalPlan.accels = self.a_desired_trajectory.tolist()
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longitudinalPlan.jerks = self.j_desired_trajectory.tolist()
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longitudinalPlan.hasLead = sm['radarState'].leadOne.status
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longitudinalPlan.longitudinalPlanSource = self.mpc.source
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longitudinalPlan.fcw = self.fcw
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a_target, should_stop = get_accel_from_plan(self.CP, longitudinalPlan.speeds, longitudinalPlan.accels)
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longitudinalPlan.aTarget = a_target
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longitudinalPlan.shouldStop = should_stop
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longitudinalPlan.allowBrake = True
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longitudinalPlan.allowThrottle = self.allow_throttle
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pm.send('longitudinalPlan', plan_send)
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