openpilot_comma/selfdrive/car/mazda/interface.py

#!/usr/bin/env python3
from cereal import car
from common.conversions import Conversions as CV
from selfdrive.car.mazda.values import CAR, LKAS_LIMITS
from selfdrive.car import STD_CARGO_KG, scale_rot_inertia, scale_tire_stiffness, gen_empty_fingerprint, get_safety_config
from selfdrive.car.interfaces import CarInterfaceBase

ButtonType = car.CarState.ButtonEvent.Type
EventName = car.CarEvent.EventName

class CarInterface(CarInterfaceBase):

  @staticmethod
  def compute_gb(accel, speed):
    return float(accel) / 4.0

  @staticmethod
  def get_params(candidate, fingerprint=gen_empty_fingerprint(), car_fw=None, disable_radar=False):
    ret = CarInterfaceBase.get_std_params(candidate, fingerprint)

    ret.carName = "mazda"
    ret.safetyConfigs = [get_safety_config(car.CarParams.SafetyModel.mazda)]
    ret.radarOffCan = True

    ret.dashcamOnly = candidate not in (CAR.CX5_2022, CAR.CX9_2021)

    ret.steerActuatorDelay = 0.1
    ret.steerLimitTimer = 0.8
    tire_stiffness_factor = 0.70   # not optimized yet

    CarInterfaceBase.configure_torque_tune(candidate, ret.lateralTuning)

    if candidate in (CAR.CX5, CAR.CX5_2022):
      ret.mass = 3655 * CV.LB_TO_KG + STD_CARGO_KG
      ret.wheelbase = 2.7
      ret.steerRatio = 15.5
    elif candidate in (CAR.CX9, CAR.CX9_2021):
      ret.mass = 4217 * CV.LB_TO_KG + STD_CARGO_KG
      ret.wheelbase = 3.1
      ret.steerRatio = 17.6
    elif candidate == CAR.MAZDA3:
      ret.mass = 2875 * CV.LB_TO_KG + STD_CARGO_KG
      ret.wheelbase = 2.7
      ret.steerRatio = 14.0
    elif candidate == CAR.MAZDA6:
      ret.mass = 3443 * CV.LB_TO_KG + STD_CARGO_KG
      ret.wheelbase = 2.83
      ret.steerRatio = 15.5

    if candidate not in (CAR.CX5_2022, ):
      ret.minSteerSpeed = LKAS_LIMITS.DISABLE_SPEED * CV.KPH_TO_MS

    ret.centerToFront = ret.wheelbase * 0.41

    # TODO: get actual value, for now starting with reasonable value for
    # civic and scaling by mass and wheelbase
    ret.rotationalInertia = scale_rot_inertia(ret.mass, ret.wheelbase)

    # TODO: start from empirically derived lateral slip stiffness for the civic and scale by
    # mass and CG position, so all cars will have approximately similar dyn behaviors
    ret.tireStiffnessFront, ret.tireStiffnessRear = scale_tire_stiffness(ret.mass, ret.wheelbase, ret.centerToFront,
                                                                         tire_stiffness_factor=tire_stiffness_factor)

    return ret

  # returns a car.CarState
  def _update(self, c):
    ret = self.CS.update(self.cp, self.cp_cam)

    # events
    events = self.create_common_events(ret)

    if self.CS.lkas_disabled:
      events.add(EventName.lkasDisabled)
    elif self.CS.low_speed_alert:
      events.add(EventName.belowSteerSpeed)

    ret.events = events.to_msg()

    return ret

  def apply(self, c):
    return self.CC.update(c, self.CS)