SUMO - Simulation of Urban MObility
MSCFModel_Wiedemann Class Reference

The Wiedemann Model car-following model. More...

#include <MSCFModel_Wiedemann.h>

Inheritance diagram for MSCFModel_Wiedemann:
Inheritance graph
Collaboration diagram for MSCFModel_Wiedemann:
Collaboration graph

Data Structures

class  VehicleVariables
 

Public Member Functions

double estimateSpeedAfterDistance (const double dist, const double v, const double accel) const
 
double getMaxAccel () const
 Get the vehicle type's maximum acceleration [m/s^2]. More...
 
double getMaxDecel () const
 Get the vehicle type's maximum deceleration [m/s^2]. More...
 
double getMinimalArrivalSpeed (double dist, double currentSpeed) const
 Computes the minimal possible arrival speed after covering a given distance. More...
 
double getMinimalArrivalSpeedEuler (double dist, double currentSpeed) const
 Computes the minimal possible arrival speed after covering a given distance for Euler update. More...
 
SUMOTime getMinimalArrivalTime (double dist, double currentSpeed, double arrivalSpeed) const
 Computes the minimal time needed to cover a distance given the desired speed at arrival. More...
 
double maximumSafeFollowSpeed (double gap, double egoSpeed, double predSpeed, double predMaxDecel, bool onInsertion=false) const
 Returns the maximum safe velocity for following the given leader. More...
 
double maximumSafeStopSpeed (double gap, double currentSpeed, bool onInsertion=false, double headway=-1) const
 Returns the maximum next velocity for stopping within gap. More...
 
double maximumSafeStopSpeedBallistic (double gap, double currentSpeed, bool onInsertion=false, double headway=-1) const
 Returns the maximum next velocity for stopping within gap when using the ballistic positional update. More...
 
double maximumSafeStopSpeedEuler (double gap) const
 Returns the maximum next velocity for stopping within gap when using the semi-implicit Euler update. More...
 
 MSCFModel_Wiedemann (const MSVehicleType *vtype, double accel, double decel, double emergencyDecel, double security, double estimation)
 Constructor. More...
 
 ~MSCFModel_Wiedemann ()
 Destructor. More...
 
Implementations of the MSCFModel interface
double moveHelper (MSVehicle *const veh, double vPos) const
 Applies interaction with stops and lane changing model influences. More...
 
double followSpeed (const MSVehicle *const veh, double speed, double gap2pred, double predSpeed, double predMaxDecel) const
 Computes the vehicle's safe speed (no dawdling) More...
 
double stopSpeed (const MSVehicle *const veh, const double speed, double gap) const
 Computes the vehicle's safe speed for approaching a non-moving obstacle (no dawdling) More...
 
double interactionGap (const MSVehicle *const, double vL) const
 Returns the maximum gap at which an interaction between both vehicles occurs. More...
 
int getModelID () const
 Returns the model's name. More...
 
MSCFModelduplicate (const MSVehicleType *vtype) const
 Duplicates the car-following model. More...
 
VehicleVariablescreateVehicleVariables () const
 Returns model specific values which are stored inside a vehicle and must be used with casting. More...
 
Methods to override by model implementation
virtual double freeSpeed (const MSVehicle *const veh, double speed, double seen, double maxSpeed, const bool onInsertion=false) const
 Computes the vehicle's safe speed without a leader. More...
 
virtual double insertionFollowSpeed (const MSVehicle *const veh, double speed, double gap2pred, double predSpeed, double predMaxDecel) const
 Computes the vehicle's safe speed (no dawdling) This method is used during the insertion stage. Whereas the method followSpeed returns the desired speed which may be lower than the safe speed, this method only considers safety constraints. More...
 
virtual double insertionStopSpeed (const MSVehicle *const veh, double speed, double gap) const
 Computes the vehicle's safe speed for approaching an obstacle at insertion without constraints due to acceleration capabilities and previous speeds. More...
 
Virtual methods with default implementation
virtual double getImperfection () const
 Get the driver's imperfection. More...
 
virtual double getHeadwayTime () const
 Get the driver's reaction time [s]. More...
 
Setter methods
virtual void setMaxAccel (double accel)
 Sets a new value for maximum acceleration [m/s^2]. More...
 
virtual void setMaxDecel (double decel)
 Sets a new value for maximum deceleration [m/s^2]. More...
 
virtual void setImperfection (double imperfection)
 Sets a new value for driver imperfection. More...
 
virtual void setHeadwayTime (double headwayTime)
 Sets a new value for driver reaction time [s]. More...
 

Static Public Member Functions

static double gapExtrapolation (const double duration, const double currentGap, double v1, double v2, double a1=0, double a2=0, const double maxV1=std::numeric_limits< double >::max(), const double maxV2=std::numeric_limits< double >::max())
 return the resulting gap if, starting with gap currentGap, two vehicles continue with constant accelerations (velocities bounded by 0 and maxSpeed) for a given timespan of length 'duration'. More...
 
static double passingTime (const double lastPos, const double passedPos, const double currentPos, const double lastSpeed, const double currentSpeed)
 Calculates the time at which the position passedPosition has been passed In case of a ballistic update, the possibility of a stop within a time step requires more information about the last time-step than in case of the euler update to determine the last position if the currentSpeed is zero. More...
 
static double speedAfterTime (const double t, const double oldSpeed, const double dist)
 Calculates the speed after a time t [0,TS] given the initial speed and the distance traveled in an interval of step length TS. More...
 

Protected Attributes

double myAccel
 The vehicle's maximum acceleration [m/s^2]. More...
 
double myApparentDecel
 The vehicle's deceleration as expected by surrounding traffic [m/s^2]. More...
 
double myDecel
 The vehicle's maximum deceleration [m/s^2]. More...
 
double myEmergencyDecel
 The vehicle's maximum emergency deceleration [m/s^2]. More...
 
double myHeadwayTime
 The driver's desired time headway (aka reaction time tau) [s]. More...
 
const MSVehicleTypemyType
 The type to which this model definition belongs to. More...
 

Private Member Functions

double _v (const MSVehicle *veh, double predSpeed, double gap) const
 
double krauss_vsafe (double gap, double predSpeed) const
 vsafe from krauss since Wiedemann is deficient at approaching More...
 
MSCFModel_Wiedemannoperator= (const MSCFModel_Wiedemann &s)
 Invalidated assignment operator. More...
 
acceleration based on the 'driving regime'
double fullspeed (double v, double vpref, double dx, double bx) const
 
double following (double sign) const
 
double approaching (double dv, double dx, double bx) const
 
double emergency (double dv, double dx) const
 

Currently fixed methods

virtual double maxNextSpeed (double speed, const MSVehicle *const veh) const
 Returns the maximum speed given the current speed. More...
 
virtual double minNextSpeed (double speed, const MSVehicle *const veh=0) const
 Returns the minimum speed given the current speed (depends on the numerical update scheme and its step width) Note that it wouldn't have to depend on the numerical update scheme if the semantics would rely on acceleration instead of velocity. More...
 
double brakeGap (const double speed) const
 Returns the distance the vehicle needs to halt including driver's reaction time, assuming that during the reaction time, the speed remains constant. More...
 
double getSecureGap (const double speed, const double leaderSpeed, const double leaderMaxDecel) const
 Returns the minimum gap to reserve if the leader is braking at maximum (>=0) More...
 
virtual double getSpeedAfterMaxDecel (double v) const
 Returns the velocity after maximum deceleration. More...
 
static double freeSpeed (const double currentSpeed, const double decel, const double dist, const double maxSpeed, const bool onInsertion)
 
static double brakeGap (const double speed, const double decel, const double headwayTime)
 

model parameter

const double mySecurity
 The driver's security parameter // also 'ZF1'. More...
 
const double myEstimation
 The driver's estimation parameter // also 'ZF2'. More...
 
const double myAX
 front-bumper to front-bumper distance More...
 
const double myCX
 perception threshold modifier More...
 
const double myMinAccel
 The vehicle's minimum acceleration [m/s^2]. More...
 
static const double D_MAX = 150
 free-flow distance in m More...
 

Detailed Description

The Wiedemann Model car-following model.

See also
MSCFModel

Definition at line 48 of file MSCFModel_Wiedemann.h.

Constructor & Destructor Documentation

◆ MSCFModel_Wiedemann()

MSCFModel_Wiedemann::MSCFModel_Wiedemann ( const MSVehicleType vtype,
double  accel,
double  decel,
double  emergencyDecel,
double  security,
double  estimation 
)

Constructor.

Parameters
[in]securityThe security parameter in [0,1] (dimensionless)
[in]estimationThe estimation capability parameter in [0,1] (dimensionless)
[in]accelThe maximum acceleration
[in]decelThe maximum deceleration
[in]emergencyDecelThe maximum emergency deceleration
Note
other parameters of the wiedemann model:

Definition at line 55 of file MSCFModel_Wiedemann.cpp.

Referenced by duplicate().

◆ ~MSCFModel_Wiedemann()

MSCFModel_Wiedemann::~MSCFModel_Wiedemann ( )

Destructor.

Definition at line 67 of file MSCFModel_Wiedemann.cpp.

Member Function Documentation

◆ _v()

◆ approaching()

double MSCFModel_Wiedemann::approaching ( double  dv,
double  dx,
double  bx 
) const
private

Definition at line 169 of file MSCFModel_Wiedemann.cpp.

Referenced by _v().

◆ brakeGap() [1/2]

◆ brakeGap() [2/2]

double MSCFModel::brakeGap ( const double  speed,
const double  decel,
const double  headwayTime 
)
staticinherited

Definition at line 66 of file MSCFModel.cpp.

References ACCEL2SPEED, MSGlobals::gSemiImplicitEulerUpdate, and SPEED2DIST.

◆ createVehicleVariables()

VehicleVariables* MSCFModel_Wiedemann::createVehicleVariables ( ) const
inlinevirtual

Returns model specific values which are stored inside a vehicle and must be used with casting.

Reimplemented from MSCFModel.

Definition at line 131 of file MSCFModel_Wiedemann.h.

◆ duplicate()

MSCFModel * MSCFModel_Wiedemann::duplicate ( const MSVehicleType vtype) const
virtual

Duplicates the car-following model.

Parameters
[in]vtypeThe vehicle type this model belongs to (1:1)
Returns
A duplicate of this car-following model

Implements MSCFModel.

Definition at line 105 of file MSCFModel_Wiedemann.cpp.

References MSCFModel_Wiedemann(), MSCFModel::myAccel, MSCFModel::myDecel, MSCFModel::myEmergencyDecel, myEstimation, and mySecurity.

Referenced by getModelID().

◆ emergency()

double MSCFModel_Wiedemann::emergency ( double  dv,
double  dx 
) const
private

Definition at line 177 of file MSCFModel_Wiedemann.cpp.

References MSCFModel::myDecel.

Referenced by _v().

◆ estimateSpeedAfterDistance()

double MSCFModel::estimateSpeedAfterDistance ( const double  dist,
const double  v,
const double  accel 
) const
inherited

◆ following()

double MSCFModel_Wiedemann::following ( double  sign) const
private

Definition at line 163 of file MSCFModel_Wiedemann.cpp.

References myMinAccel, and sign.

Referenced by _v().

◆ followSpeed()

double MSCFModel_Wiedemann::followSpeed ( const MSVehicle *const  veh,
double  speed,
double  gap2pred,
double  predSpeed,
double  predMaxDecel 
) const
virtual

Computes the vehicle's safe speed (no dawdling)

Parameters
[in]vehThe vehicle (EGO)
[in]speedThe vehicle's speed
[in]gap2predThe (netto) distance to the LEADER
[in]predSpeedThe speed of LEADER
Returns
EGO's safe speed
See also
MSCFModel::ffeV

Implements MSCFModel.

Definition at line 80 of file MSCFModel_Wiedemann.cpp.

References _v().

◆ freeSpeed() [1/2]

double MSCFModel::freeSpeed ( const MSVehicle *const  veh,
double  speed,
double  seen,
double  maxSpeed,
const bool  onInsertion = false 
) const
virtualinherited

Computes the vehicle's safe speed without a leader.

Returns the velocity of the vehicle in dependence to the length of the free street and the target velocity at the end of the free range. If onInsertion is true, the vehicle may still brake before the next movement.

Parameters
[in]vehThe vehicle (EGO)
[in]speedThe vehicle's speed
[in]seenThe look ahead distance
[in]maxSpeedThe maximum allowed speed
[in]onInsertionwhether speed at insertion is asked for
Returns
EGO's safe speed

Reimplemented in MSCFModel_Rail.

Definition at line 211 of file MSCFModel.cpp.

References MSCFModel::myDecel.

Referenced by MSCFModel::brakeGap(), MSLane::isInsertionSuccess(), and MSVehicle::planMoveInternal().

◆ freeSpeed() [2/2]

double MSCFModel::freeSpeed ( const double  currentSpeed,
const double  decel,
const double  dist,
const double  maxSpeed,
const bool  onInsertion 
)
staticinherited

◆ fullspeed()

double MSCFModel_Wiedemann::fullspeed ( double  v,
double  vpref,
double  dx,
double  bx 
) const
private

Definition at line 151 of file MSCFModel_Wiedemann.cpp.

References MIN2(), MSCFModel::myAccel, and myMinAccel.

Referenced by _v().

◆ gapExtrapolation()

double MSCFModel::gapExtrapolation ( const double  duration,
const double  currentGap,
double  v1,
double  v2,
double  a1 = 0,
double  a2 = 0,
const double  maxV1 = std::numeric_limits<double>::max(),
const double  maxV2 = std::numeric_limits<double>::max() 
)
staticinherited

return the resulting gap if, starting with gap currentGap, two vehicles continue with constant accelerations (velocities bounded by 0 and maxSpeed) for a given timespan of length 'duration'.

Parameters
[in]currentGap(pos(veh1) - pos(veh2) at start)
[in]v1initial speed of vehicle 1
[in]v2initial speed of vehicle 2
[in]a1acceleration of vehicle 1
[in]a2acceleration of vehicle 2
[in]maxV1maximal speed of vehicle 1
[in]maxV2maximal speed of vehicle 2
[in]durationtime span for the process
Returns
estimated gap after 'duration' seconds

Definition at line 278 of file MSCFModel.cpp.

References MSGlobals::gSemiImplicitEulerUpdate, MAX2(), MIN2(), and TS.

Referenced by MSCFModel::getSpeedAfterMaxDecel(), and MSLCM_LC2013::informFollower().

◆ getHeadwayTime()

virtual double MSCFModel::getHeadwayTime ( ) const
inlinevirtualinherited

◆ getImperfection()

virtual double MSCFModel::getImperfection ( ) const
inlinevirtualinherited

Get the driver's imperfection.

Returns
The imperfection of drivers of this class

Reimplemented in MSCFModel_KraussOrig1, MSCFModel_PWag2009, MSCFModel_SmartSK, and MSCFModel_Daniel1.

Definition at line 212 of file MSCFModel.h.

Referenced by TraCI_VehicleType::getImperfection().

◆ getMaxAccel()

double MSCFModel::getMaxAccel ( ) const
inlineinherited

◆ getMaxDecel()

double MSCFModel::getMaxDecel ( ) const
inlineinherited

Get the vehicle type's maximum deceleration [m/s^2].

Returns
The maximum deceleration (in m/s^2) of vehicles of this class

Definition at line 201 of file MSCFModel.h.

References MSCFModel::myDecel.

Referenced by MSLCM_LC2013::_wantsChange(), MSCriticalFollowerDistanceInfo::addFollower(), MSLink::blockedByFoe(), MSLaneChanger::changeOpposite(), MSLCM_SL2015::checkBlockingVehicles(), MSLaneChanger::checkChange(), MSVehicle::checkRewindLinkLanes(), MSLCM_SL2015::checkStrategicChange(), MSLaneChanger::computeOvertakingTime(), MSLink::couldBrakeForLeader(), MSVehicle::executeMove(), MSLane::freeInsertion(), MSLane::getCriticalLeader(), TraCI_VehicleType::getDecel(), MSLane::getLeaderOnConsecutive(), MSLane::getLeadersOnConsecutive(), MSCFModel::getMinimalArrivalSpeed(), MSCFModel::getMinimalArrivalSpeedEuler(), MSCFModel::getMinimalArrivalTime(), MSLane::getMissingRearGap(), MSLink::getZipperSpeed(), MSLCM_DK2008::informBlocker(), MSLCM_LC2013::informFollower(), MSLCM_SL2015::informFollower(), MSLCM_LC2013::informLeader(), MSLCM_SL2015::informLeader(), MSLane::isInsertionSuccess(), MESegment::isOpen(), MSLane::lastInsertion(), MSLink::maybeOccupied(), MSCFModel_KraussOrig1::moveHelper(), MSLCM_LC2013::overtakeDistance(), MSVehicle::planMoveInternal(), MSLane::safeInsertionSpeed(), MSLCM_SL2015::saveBlockerLength(), MSLCM_LC2013::saveBlockerLength(), GUIVehicle::selectBlockingFoes(), MSLCM_LC2013::slowDownForBlocked(), MSLCM_SL2015::slowDownForBlocked(), MSLCM_SL2015::updateExpectedSublaneSpeeds(), MSVehicleControl::vehicleDeparted(), MSLCM_DK2008::wantsChangeToLeft(), and MSLCM_DK2008::wantsChangeToRight().

◆ getMinimalArrivalSpeed()

double MSCFModel::getMinimalArrivalSpeed ( double  dist,
double  currentSpeed 
) const
inherited

Computes the minimal possible arrival speed after covering a given distance.

Parameters
[in]distDistance to be covered
[in]currentSpeedActual speed of vehicle

Definition at line 252 of file MSCFModel.cpp.

References MSCFModel::estimateSpeedAfterDistance(), MSCFModel::getHeadwayTime(), and MSCFModel::getMaxDecel().

Referenced by MSCFModel::getSpeedAfterMaxDecel(), and MSVehicle::planMoveInternal().

◆ getMinimalArrivalSpeedEuler()

double MSCFModel::getMinimalArrivalSpeedEuler ( double  dist,
double  currentSpeed 
) const
inherited

Computes the minimal possible arrival speed after covering a given distance for Euler update.

Parameters
[in]distDistance to be covered
[in]currentSpeedActual speed of vehicle

Definition at line 259 of file MSCFModel.cpp.

References MSCFModel::estimateSpeedAfterDistance(), MSCFModel::getHeadwayTime(), MSCFModel::getMaxDecel(), and INVALID_SPEED.

Referenced by MSCFModel::getSpeedAfterMaxDecel(), and MSVehicle::planMoveInternal().

◆ getMinimalArrivalTime()

SUMOTime MSCFModel::getMinimalArrivalTime ( double  dist,
double  currentSpeed,
double  arrivalSpeed 
) const
inherited

Computes the minimal time needed to cover a distance given the desired speed at arrival.

Parameters
[in]distDistance to be covered
[in]currentSpeedActual speed of vehicle
[in]arrivalSpeedDesired speed at arrival

Definition at line 239 of file MSCFModel.cpp.

References MSCFModel::getMaxAccel(), MSCFModel::getMaxDecel(), MAX2(), MAX3(), SUMO_const_haltingSpeed, and TIME2STEPS.

Referenced by MSCFModel::getSpeedAfterMaxDecel(), and MSVehicle::planMoveInternal().

◆ getModelID()

int MSCFModel_Wiedemann::getModelID ( ) const
inlinevirtual

Returns the model's name.

Returns
The model's name
See also
MSCFModel::getModelName

Implements MSCFModel.

Definition at line 119 of file MSCFModel_Wiedemann.h.

References duplicate(), and SUMO_TAG_CF_WIEDEMANN.

◆ getSecureGap()

double MSCFModel::getSecureGap ( const double  speed,
const double  leaderSpeed,
const double  leaderMaxDecel 
) const
inlineinherited

◆ getSpeedAfterMaxDecel()

◆ insertionFollowSpeed()

double MSCFModel::insertionFollowSpeed ( const MSVehicle *const  veh,
double  speed,
double  gap2pred,
double  predSpeed,
double  predMaxDecel 
) const
virtualinherited

Computes the vehicle's safe speed (no dawdling) This method is used during the insertion stage. Whereas the method followSpeed returns the desired speed which may be lower than the safe speed, this method only considers safety constraints.

Returns the velocity of the vehicle in dependence to the vehicle's and its leader's values and the distance between them.

Parameters
[in]vehThe vehicle (EGO)
[in]speedThe vehicle's speed
[in]gap2predThe (netto) distance to the LEADER
[in]predSpeedThe speed of LEADER
Returns
EGO's safe speed

Reimplemented in MSCFModel_KraussOrig1.

Definition at line 218 of file MSCFModel.cpp.

References MSGlobals::gSemiImplicitEulerUpdate, and MSCFModel::maximumSafeFollowSpeed().

Referenced by MSLane::freeInsertion(), MSLane::getCriticalLeader(), MSLane::isInsertionSuccess(), and MSLane::safeInsertionSpeed().

◆ insertionStopSpeed()

double MSCFModel::insertionStopSpeed ( const MSVehicle *const  veh,
double  speed,
double  gap 
) const
virtualinherited

Computes the vehicle's safe speed for approaching an obstacle at insertion without constraints due to acceleration capabilities and previous speeds.

Parameters
[in]vehThe vehicle (EGO)
[in]speedThe vehicle's speed
[in]gapThe (netto) distance to the the obstacle
Returns
EGO's safe speed for approaching a non-moving obstacle at insertion
See also
stopSpeed() and insertionFollowSpeed()

Definition at line 229 of file MSCFModel.cpp.

References MSVehicleType::getMaxSpeed(), MSGlobals::gSemiImplicitEulerUpdate, MSCFModel::maximumSafeStopSpeed(), MIN2(), MSCFModel::myType, and MSCFModel::stopSpeed().

Referenced by MSLane::isInsertionSuccess().

◆ interactionGap()

double MSCFModel_Wiedemann::interactionGap ( const MSVehicle * const  ,
double  vL 
) const
virtual

Returns the maximum gap at which an interaction between both vehicles occurs.

"interaction" means that the LEADER influences EGO's speed.

Parameters
[in]vehThe EGO vehicle
[in]vLLEADER's speed
Returns
The interaction gap
Todo:
evaluate signature
See also
MSCFModel::interactionGap

Reimplemented from MSCFModel.

Definition at line 98 of file MSCFModel_Wiedemann.cpp.

References D_MAX, and UNUSED_PARAMETER.

◆ krauss_vsafe()

double MSCFModel_Wiedemann::krauss_vsafe ( double  gap,
double  predSpeed 
) const
private

vsafe from krauss since Wiedemann is deficient at approaching

Definition at line 200 of file MSCFModel_Wiedemann.cpp.

References ACCEL2SPEED, MSCFModel::myDecel, MSCFModel::myHeadwayTime, and SPEED2DIST.

Referenced by stopSpeed().

◆ maximumSafeFollowSpeed()

double MSCFModel::maximumSafeFollowSpeed ( double  gap,
double  egoSpeed,
double  predSpeed,
double  predMaxDecel,
bool  onInsertion = false 
) const
inherited

Returns the maximum safe velocity for following the given leader.

Parameters
[in]gap2predThe (netto) distance to the LEADER
[in]egoSpeedThe FOLLOWERS's speed
[in]predSpeedThe LEADER's speed
[in]predMaxDecelThe LEADER's maximum deceleration
[in]onInsertionIndicator whether the call is triggered during vehicle insertion
Returns
the safe velocity

Returns the SK-vsafe.

Definition at line 590 of file MSCFModel.cpp.

References MSCFModel::brakeGap(), MSGlobals::gSemiImplicitEulerUpdate, ISNAN(), MAX2(), MSCFModel::maximumSafeStopSpeed(), MSCFModel::myDecel, and MSCFModel::myHeadwayTime.

Referenced by MSCFModel_KraussOrig1::followSpeed(), MSCFModel_Krauss::followSpeed(), MSCFModel_KraussOrig1::insertionFollowSpeed(), MSCFModel::insertionFollowSpeed(), and MSCFModel::setHeadwayTime().

◆ maximumSafeStopSpeed()

double MSCFModel::maximumSafeStopSpeed ( double  gap,
double  currentSpeed,
bool  onInsertion = false,
double  headway = -1 
) const
inherited

Returns the maximum next velocity for stopping within gap.

Parameters
[in]gapThe (netto) distance to the desired stopping point
[in]currentSpeedThe current speed of the ego vehicle
[in]onInsertionIndicator whether the call is triggered during vehicle insertion
[in]headwayThe desired time headway to be included in the calculations (default argument -1 induces the use of myHeadway)

Definition at line 482 of file MSCFModel.cpp.

References MSGlobals::gSemiImplicitEulerUpdate, MSCFModel::maximumSafeStopSpeedBallistic(), and MSCFModel::maximumSafeStopSpeedEuler().

Referenced by MSCFModel::insertionStopSpeed(), MSCFModel::maximumSafeFollowSpeed(), MSVehicle::planMoveInternal(), MSCFModel::setHeadwayTime(), MSCFModel_Krauss::stopSpeed(), and MSCFModel_Rail::stopSpeed().

◆ maximumSafeStopSpeedBallistic()

double MSCFModel::maximumSafeStopSpeedBallistic ( double  gap,
double  currentSpeed,
bool  onInsertion = false,
double  headway = -1 
) const
inherited

Returns the maximum next velocity for stopping within gap when using the ballistic positional update.

Note
This takes into account the driver's reaction time and the car's current speed. (The latter is required to calculate the distance covered in the following timestep.)
Parameters
[in]gapThe (netto) distance to the desired stopping point
[in]currentSpeedThe current speed of the ego vehicle
[in]onInsertionIndicator whether the call is triggered during vehicle insertion
[in]headwayThe desired time headway to be included in the calculations (default argument -1 induces the use of myHeadway)
Returns
the safe velocity (to be attained at the end of the following time step) that assures the possibility of stopping within gap. If a negative value is returned, the required stop has to take place before the end of the time step.

Definition at line 523 of file MSCFModel.cpp.

References INVALID_SPEED, MAX2(), MSCFModel::myDecel, MSCFModel::myHeadwayTime, NUMERICAL_EPS, and TS.

Referenced by MSCFModel::maximumSafeStopSpeed(), MSCFModel::setHeadwayTime(), and MSCFModel_KraussOrig1::stopSpeed().

◆ maximumSafeStopSpeedEuler()

double MSCFModel::maximumSafeStopSpeedEuler ( double  gap) const
inherited

Returns the maximum next velocity for stopping within gap when using the semi-implicit Euler update.

Parameters
[in]gapThe (netto) distance to the LEADER

Definition at line 492 of file MSCFModel.cpp.

References ACCEL2SPEED, DIST2SPEED, MIN2(), MSCFModel::myDecel, MSCFModel::myHeadwayTime, NUMERICAL_EPS, and TS.

Referenced by MSCFModel::maximumSafeStopSpeed(), and MSCFModel::setHeadwayTime().

◆ maxNextSpeed()

double MSCFModel::maxNextSpeed ( double  speed,
const MSVehicle *const  veh 
) const
virtualinherited

Returns the maximum speed given the current speed.

The implementation of this method must take into account the time step duration.

Justification: Due to air brake or other influences, the vehicle's next maximum speed may depend on the vehicle's current speed (given).

Parameters
[in]speedThe vehicle's current speed
[in]speedThe vehicle itself, for obtaining other values
Returns
The maximum possible speed for the next step

Reimplemented in MSCFModel_KraussPS, and MSCFModel_Rail.

Definition at line 193 of file MSCFModel.cpp.

References ACCEL2SPEED, MSCFModel::getMaxAccel(), MSVehicleType::getMaxSpeed(), MIN2(), and MSCFModel::myType.

Referenced by MSVehicle::executeMove(), MSCFModel_Kerner::followSpeed(), MSCFModel_Daniel1::followSpeed(), MSCFModel_SmartSK::followSpeed(), MSCFModel_KraussOrig1::followSpeed(), MSCFModel_Krauss::followSpeed(), MSCFModel::getHeadwayTime(), MSCFModel::interactionGap(), MSCFModel_Daniel1::moveHelper(), MSCFModel_SmartSK::moveHelper(), MSCFModel_KraussOrig1::moveHelper(), MSCFModel_KraussX::moveHelper(), MSCFModel::moveHelper(), MSLCM_DK2008::patchSpeed(), MSVehicle::planMoveInternal(), MSCFModel_Krauss::stopSpeed(), MSCFModel_Kerner::stopSpeed(), MSCFModel_Daniel1::stopSpeed(), MSCFModel_SmartSK::stopSpeed(), MSCFModel_KraussOrig1::stopSpeed(), and stopSpeed().

◆ minNextSpeed()

double MSCFModel::minNextSpeed ( double  speed,
const MSVehicle *const  veh = 0 
) const
virtualinherited

Returns the minimum speed given the current speed (depends on the numerical update scheme and its step width) Note that it wouldn't have to depend on the numerical update scheme if the semantics would rely on acceleration instead of velocity.

Parameters
[in]speedThe vehicle's current speed
[in]speedThe vehicle itself, for obtaining other values, if needed as e.g. road conditions.
Returns
The minimum possible speed for the next step

Reimplemented in MSCFModel_Rail.

Definition at line 198 of file MSCFModel.cpp.

References ACCEL2SPEED, MSGlobals::gSemiImplicitEulerUpdate, MAX2(), and MSCFModel::myEmergencyDecel.

Referenced by MSCFModel_KraussOrig1::followSpeed(), MSCFModel_Krauss::followSpeed(), MSCFModel::getHeadwayTime(), MSCFModel_KraussOrig1::moveHelper(), MSCFModel_KraussX::moveHelper(), and MSCFModel::moveHelper().

◆ moveHelper()

double MSCFModel_Wiedemann::moveHelper ( MSVehicle *const  veh,
double  vPos 
) const
virtual

Applies interaction with stops and lane changing model influences.

Parameters
[in]vehThe ego vehicle
[in]vPosThe possible velocity
Returns
The velocity after applying interactions with stops and lane change model influences

Reimplemented from MSCFModel.

Definition at line 71 of file MSCFModel_Wiedemann.cpp.

References MSCFModel_Wiedemann::VehicleVariables::accelSign, MSVehicle::getCarFollowVariables(), MSVehicle::getSpeed(), and MSCFModel::moveHelper().

◆ operator=()

MSCFModel_Wiedemann& MSCFModel_Wiedemann::operator= ( const MSCFModel_Wiedemann s)
private

Invalidated assignment operator.

◆ passingTime()

double MSCFModel::passingTime ( const double  lastPos,
const double  passedPos,
const double  currentPos,
const double  lastSpeed,
const double  currentSpeed 
)
staticinherited

Calculates the time at which the position passedPosition has been passed In case of a ballistic update, the possibility of a stop within a time step requires more information about the last time-step than in case of the euler update to determine the last position if the currentSpeed is zero.

Parameters
[in]lastPosthe position at time t=0 (must be < currentPos)
[in]passedPosthe position for which the passing time is to be determined (has to lie within [lastPos, currentPos]!)
[in]currentPosthe position at time t=TS (one time-step after lastPos) (must be > lastPos)
[in]lastSpeedthe speed at moment t=0
[in]currentSpeedthe speed at moment t=TS
Returns
time t in [0,TS] at which passedPos in [lastPos, currentPos] was passed.

Definition at line 372 of file MSCFModel.cpp.

References MSGlobals::gSemiImplicitEulerUpdate, MAX2(), MIN2(), NUMERICAL_EPS, SPEED2ACCEL, TS, and WRITE_ERROR.

Referenced by MSE2Collector::calculateTimeLossAndTimeOnDetector(), MSCFModel::getSpeedAfterMaxDecel(), MSE3Collector::MSE3EntryReminder::notifyMove(), MSInstantInductLoop::notifyMove(), MSMeanData::MeanDataValues::notifyMove(), MSInductLoop::notifyMove(), and MSE3Collector::MSE3LeaveReminder::notifyMove().

◆ setHeadwayTime()

virtual void MSCFModel::setHeadwayTime ( double  headwayTime)
inlinevirtualinherited

Sets a new value for driver reaction time [s].

Parameters
[in]headwayTimeThe new driver reaction time (in s)

Reimplemented in MSCFModel_KraussOrig1, MSCFModel_SmartSK, and MSCFModel_Daniel1.

Definition at line 415 of file MSCFModel.h.

References MSCFModel::maximumSafeFollowSpeed(), MSCFModel::maximumSafeStopSpeed(), MSCFModel::maximumSafeStopSpeedBallistic(), MSCFModel::maximumSafeStopSpeedEuler(), and MSCFModel::myHeadwayTime.

Referenced by TraCI_VehicleType::setTau().

◆ setImperfection()

virtual void MSCFModel::setImperfection ( double  imperfection)
inlinevirtualinherited

Sets a new value for driver imperfection.

Parameters
[in]accelThe new driver imperfection

Reimplemented in MSCFModel_KraussOrig1, MSCFModel_SmartSK, and MSCFModel_Daniel1.

Definition at line 407 of file MSCFModel.h.

References UNUSED_PARAMETER.

Referenced by TraCI_VehicleType::setImperfection().

◆ setMaxAccel()

virtual void MSCFModel::setMaxAccel ( double  accel)
inlinevirtualinherited

Sets a new value for maximum acceleration [m/s^2].

Parameters
[in]accelThe new acceleration in m/s^2

Definition at line 391 of file MSCFModel.h.

References MSCFModel::myAccel.

Referenced by TraCI_VehicleType::setAccel().

◆ setMaxDecel()

virtual void MSCFModel::setMaxDecel ( double  decel)
inlinevirtualinherited

Sets a new value for maximum deceleration [m/s^2].

Parameters
[in]accelThe new deceleration in m/s^2

Reimplemented in MSCFModel_KraussOrig1, MSCFModel_SmartSK, and MSCFModel_Daniel1.

Definition at line 399 of file MSCFModel.h.

References MSCFModel::myDecel.

Referenced by MSCFModel_Rail::MSCFModel_Rail(), and TraCI_VehicleType::setDecel().

◆ speedAfterTime()

double MSCFModel::speedAfterTime ( const double  t,
const double  oldSpeed,
const double  dist 
)
staticinherited

Calculates the speed after a time t [0,TS] given the initial speed and the distance traveled in an interval of step length TS.

Note
If the acceleration were known, this would be much nicer, but in this way we need to reconstruct it (for the ballistic update at least, where we assume that a stop may occur within the interval)
Parameters
[in]ttime in [0,TS] for which the speed shall be determined
[in]oldSpeedspeed before the last time step (referred to as t == 0)
[in]distancecovered
Returns
speed at time t

Definition at line 444 of file MSCFModel.cpp.

References DIST2SPEED, MSGlobals::gSemiImplicitEulerUpdate, and TS.

Referenced by MSE2Collector::calculateTimeLossAndTimeOnDetector(), MSCFModel::getSpeedAfterMaxDecel(), MSInstantInductLoop::notifyMove(), and MSMeanData::MeanDataValues::notifyMove().

◆ stopSpeed()

double MSCFModel_Wiedemann::stopSpeed ( const MSVehicle *const  veh,
const double  speed,
double  gap 
) const
virtual

Computes the vehicle's safe speed for approaching a non-moving obstacle (no dawdling)

Parameters
[in]vehThe vehicle (EGO)
[in]gapThe (netto) distance to the the obstacle
Returns
EGO's safe speed for approaching a non-moving obstacle
See also
MSCFModel::ffeS
Todo:
generic Interface, models can call for the values they need

Implements MSCFModel.

Definition at line 86 of file MSCFModel_Wiedemann.cpp.

References MSCFModel::getSpeedAfterMaxDecel(), krauss_vsafe(), MAX2(), MSCFModel::maxNextSpeed(), and MIN2().

Field Documentation

◆ D_MAX

const double MSCFModel_Wiedemann::D_MAX = 150
staticprivate

free-flow distance in m

Definition at line 180 of file MSCFModel_Wiedemann.h.

Referenced by _v(), and interactionGap().

◆ myAccel

◆ myApparentDecel

double MSCFModel::myApparentDecel
protectedinherited

The vehicle's deceleration as expected by surrounding traffic [m/s^2].

Definition at line 473 of file MSCFModel.h.

Referenced by MSCFModel_KraussX::duplicate(), MSCFModel_Krauss::duplicate(), and MSCFModel_KraussOrig1::duplicate().

◆ myAX

const double MSCFModel_Wiedemann::myAX
private

front-bumper to front-bumper distance

Definition at line 171 of file MSCFModel_Wiedemann.h.

Referenced by _v().

◆ myCX

const double MSCFModel_Wiedemann::myCX
private

perception threshold modifier

Definition at line 174 of file MSCFModel_Wiedemann.h.

Referenced by _v().

◆ myDecel

◆ myEmergencyDecel

◆ myEstimation

const double MSCFModel_Wiedemann::myEstimation
private

The driver's estimation parameter // also 'ZF2'.

Definition at line 168 of file MSCFModel_Wiedemann.h.

Referenced by _v(), and duplicate().

◆ myHeadwayTime

◆ myMinAccel

const double MSCFModel_Wiedemann::myMinAccel
private

The vehicle's minimum acceleration [m/s^2].

Definition at line 177 of file MSCFModel_Wiedemann.h.

Referenced by following(), and fullspeed().

◆ mySecurity

const double MSCFModel_Wiedemann::mySecurity
private

The driver's security parameter // also 'ZF1'.

Definition at line 165 of file MSCFModel_Wiedemann.h.

Referenced by _v(), and duplicate().

◆ myType

const MSVehicleType* MSCFModel::myType
protectedinherited

The type to which this model definition belongs to.

Definition at line 463 of file MSCFModel.h.

Referenced by _v(), MSCFModel_IDM::_v(), MSCFModel::estimateSpeedAfterDistance(), MSCFModel::insertionStopSpeed(), MSCFModel_KraussPS::maxNextSpeed(), and MSCFModel::maxNextSpeed().


The documentation for this class was generated from the following files: