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MSCFModel_Wiedemann Class Reference

The Intellignet Driver Model (IDM) car-following model. More...

#include <MSCFModel_Wiedemann.h>

Inheritance diagram for MSCFModel_Wiedemann:
MSCFModel

Data Structures

class  VehicleVariables
 

Public Member Functions

SUMOReal getMaxAccel () const
 Get the vehicle type's maximum acceleration [m/s^2]. More...
 
SUMOReal getMaxDecel () const
 Get the vehicle type's maximum deceleration [m/s^2]. More...
 
 MSCFModel_Wiedemann (const MSVehicleType *vtype, SUMOReal accel, SUMOReal decel, SUMOReal security, SUMOReal estimation)
 Constructor. More...
 
 ~MSCFModel_Wiedemann ()
 Destructor. More...
 
Implementations of the MSCFModel interface
SUMOReal moveHelper (MSVehicle *const veh, SUMOReal vPos) const
 Applies interaction with stops and lane changing model influences. More...
 
SUMOReal followSpeed (const MSVehicle *const veh, SUMOReal speed, SUMOReal gap2pred, SUMOReal predSpeed, SUMOReal predMaxDecel) const
 Computes the vehicle's safe speed (no dawdling) More...
 
SUMOReal stopSpeed (const MSVehicle *const veh, const SUMOReal speed, SUMOReal gap) const
 Computes the vehicle's safe speed for approaching a non-moving obstacle (no dawdling) More...
 
SUMOReal interactionGap (const MSVehicle *const , SUMOReal 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 SUMOReal freeSpeed (const MSVehicle *const veh, SUMOReal speed, SUMOReal seen, SUMOReal maxSpeed) const
 Computes the vehicle's safe speed without a leader. More...
 
Virtual methods with default implementation
virtual SUMOReal getImperfection () const
 Get the driver's imperfection. More...
 
virtual SUMOReal getHeadwayTime () const
 Get the driver's reaction time [s]. More...
 
Setter methods
virtual void setMaxAccel (SUMOReal accel)
 Sets a new value for maximum acceleration [m/s^2]. More...
 
virtual void setMaxDecel (SUMOReal decel)
 Sets a new value for maximum deceleration [m/s^2]. More...
 
virtual void setImperfection (SUMOReal imperfection)
 Sets a new value for driver imperfection. More...
 
virtual void setHeadwayTime (SUMOReal headwayTime)
 Sets a new value for driver reaction time [s]. More...
 

Protected Attributes

SUMOReal myAccel
 The vehicle's maximum acceleration [m/s^2]. More...
 
SUMOReal myDecel
 The vehicle's maximum deceleration [m/s^2]. More...
 
SUMOReal 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

SUMOReal _v (const MSVehicle *veh, SUMOReal predSpeed, SUMOReal gap) const
 
SUMOReal krauss_vsafe (SUMOReal gap, SUMOReal 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'
SUMOReal fullspeed (SUMOReal v, SUMOReal vpref, SUMOReal dx, SUMOReal bx) const
 
SUMOReal following (SUMOReal sign) const
 
SUMOReal approaching (SUMOReal dv, SUMOReal dx, SUMOReal bx) const
 
SUMOReal emergency (SUMOReal dv, SUMOReal dx) const
 

Currently fixed methods

virtual SUMOReal maxNextSpeed (SUMOReal speed, const MSVehicle *const veh) const
 Returns the maximum speed given the current speed. More...
 
SUMOReal brakeGap (const SUMOReal speed) const
 Returns the distance the vehicle needs to halt including driver's reaction time. More...
 
SUMOReal getSecureGap (const SUMOReal speed, const SUMOReal leaderSpeed, const SUMOReal leaderMaxDecel) const
 Returns the minimum gap to reserve if the leader is braking at maximum. More...
 
SUMOReal getSpeedAfterMaxDecel (SUMOReal v) const
 Returns the velocity after maximum deceleration. More...
 
static SUMOReal brakeGap (const SUMOReal speed, const SUMOReal decel, const SUMOReal headwayTime)
 

model parameter

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

Detailed Description

The Intellignet Driver Model (IDM) car-following model.

See Also
MSCFModel

Definition at line 47 of file MSCFModel_Wiedemann.h.

Constructor & Destructor Documentation

MSCFModel_Wiedemann::MSCFModel_Wiedemann ( const MSVehicleType vtype,
SUMOReal  accel,
SUMOReal  decel,
SUMOReal  security,
SUMOReal  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
Note
other parameters of the wiedemann model:

Definition at line 54 of file MSCFModel_Wiedemann.cpp.

Referenced by duplicate().

MSCFModel_Wiedemann::~MSCFModel_Wiedemann ( )

Destructor.

Definition at line 66 of file MSCFModel_Wiedemann.cpp.

Member Function Documentation

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

Definition at line 168 of file MSCFModel_Wiedemann.cpp.

Referenced by _v().

SUMOReal MSCFModel::brakeGap ( const SUMOReal  speed) const
inlineinherited
static SUMOReal MSCFModel::brakeGap ( const SUMOReal  speed,
const SUMOReal  decel,
const SUMOReal  headwayTime 
)
inlinestaticinherited

Definition at line 218 of file MSCFModel.h.

References ACCEL2SPEED, SPEED2DIST, and SUMOReal.

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 129 of file MSCFModel_Wiedemann.h.

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 104 of file MSCFModel_Wiedemann.cpp.

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

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

Definition at line 175 of file MSCFModel_Wiedemann.cpp.

References MSCFModel::myDecel.

Referenced by _v().

SUMOReal MSCFModel_Wiedemann::following ( SUMOReal  sign) const
private

Definition at line 162 of file MSCFModel_Wiedemann.cpp.

References myMinAccel, and sign.

Referenced by _v().

SUMOReal MSCFModel_Wiedemann::followSpeed ( const MSVehicle *const  veh,
SUMOReal  speed,
SUMOReal  gap2pred,
SUMOReal  predSpeed,
SUMOReal  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 79 of file MSCFModel_Wiedemann.cpp.

References _v().

SUMOReal MSCFModel::freeSpeed ( const MSVehicle *const  veh,
SUMOReal  speed,
SUMOReal  seen,
SUMOReal  maxSpeed 
) 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.

Parameters
[in]vehThe vehicle (EGO)
[in]speedThe vehicle's speed
[in]seenThe look ahead distance
[in]maxSpeedThe maximum allowed speed
Returns
EGO's safe speed

Definition at line 92 of file MSCFModel.cpp.

References ACCEL2SPEED, MAX2(), MSCFModel::myDecel, SPEED2DIST, and SUMOReal.

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

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

Definition at line 150 of file MSCFModel_Wiedemann.cpp.

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

Referenced by _v().

virtual SUMOReal MSCFModel::getHeadwayTime ( ) const
inlinevirtualinherited
virtual SUMOReal MSCFModel::getImperfection ( ) const
inlinevirtualinherited

Get the driver's imperfection.

Returns
The imperfection of drivers of this class

Reimplemented in MSCFModel_KraussOrig1, MSCFModel_PWag2009, MSCFModel_Daniel1, and MSCFModel_SmartSK.

Definition at line 176 of file MSCFModel.h.

Referenced by TraCIServerAPI_VehicleType::getVariable().

SUMOReal MSCFModel::getMaxAccel ( ) const
inlineinherited

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

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

Definition at line 157 of file MSCFModel.h.

References MSCFModel::myAccel.

Referenced by MSVehicle::estimateLeaveSpeed(), TraCIServerAPI_VehicleType::getVariable(), MSCFModel_KraussPS::maxNextSpeed(), MSCFModel::maxNextSpeed(), MSVehicle::planMoveInternal(), and MSMeanData_HBEFA::MSLaneMeanDataValues::write().

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 117 of file MSCFModel_Wiedemann.h.

References SUMO_TAG_CF_WIEDEMANN.

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

Returns the minimum gap to reserve if the leader is braking at maximum.

Parameters
[in]speedEGO's speed
[in]leaderSpeedLEADER's speed
[in]leaderMaxDecelLEADER's max. deceleration rate

Definition at line 232 of file MSCFModel.h.

References MSCFModel::brakeGap(), MAX2(), MIN2(), MSCFModel::myDecel, MSCFModel::myHeadwayTime, and SUMOReal.

Referenced by MSLaneChanger::checkChange(), MSLane::freeInsertion(), MSLane::getMissingRearGap(), MSLCM_DK2008::informBlocker(), MSLCM_JE2013::informFollower(), MSLCM_LC2013::informFollower(), MSLCM_JE2013::informLeader(), MSLCM_LC2013::informLeader(), and MSLane::isInsertionSuccess().

SUMOReal MSCFModel::getSpeedAfterMaxDecel ( SUMOReal  v) const
inlineinherited

Returns the velocity after maximum deceleration.

Parameters
[in]vThe velocity
Returns
The velocity after maximum deceleration

Definition at line 245 of file MSCFModel.h.

References ACCEL2SPEED, MAX2(), MSCFModel::myDecel, and SUMOReal.

Referenced by MSCFModel_SmartSK::followSpeed(), MSCFModel_Daniel1::moveHelper(), MSCFModel_SmartSK::moveHelper(), MSCFModel_KraussOrig1::moveHelper(), MSCFModel::moveHelper(), MSVehicle::planMoveInternal(), MSCFModel_SmartSK::stopSpeed(), and stopSpeed().

SUMOReal MSCFModel_Wiedemann::interactionGap ( const MSVehicle * const  ,
SUMOReal  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 97 of file MSCFModel_Wiedemann.cpp.

References D_MAX, and UNUSED_PARAMETER.

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

vsafe from krauss since Wiedemann is deficient at approaching

Definition at line 196 of file MSCFModel_Wiedemann.cpp.

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

Referenced by stopSpeed().

SUMOReal MSCFModel::maxNextSpeed ( SUMOReal  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.

Definition at line 86 of file MSCFModel.cpp.

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

Referenced by MSVehicle::executeMove(), MSCFModel_Krauss::followSpeed(), MSCFModel_Kerner::followSpeed(), MSCFModel_Daniel1::followSpeed(), MSCFModel_SmartSK::followSpeed(), MSCFModel_KraussOrig1::followSpeed(), MSLane::getFollowerOnConsecutive(), MSLane::getMissingRearGap(), MSCFModel::interactionGap(), MSCFModel_Daniel1::moveHelper(), MSCFModel_SmartSK::moveHelper(), MSCFModel_KraussOrig1::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().

SUMOReal MSCFModel_Wiedemann::moveHelper ( MSVehicle *const  veh,
SUMOReal  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 70 of file MSCFModel_Wiedemann.cpp.

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

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

Invalidated assignment operator.

virtual void MSCFModel::setHeadwayTime ( SUMOReal  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_Daniel1, and MSCFModel_SmartSK.

Definition at line 281 of file MSCFModel.h.

References MSCFModel::myHeadwayTime.

Referenced by TraCIServerAPI_VehicleType::setVariable().

virtual void MSCFModel::setImperfection ( SUMOReal  imperfection)
inlinevirtualinherited

Sets a new value for driver imperfection.

Parameters
[in]accelThe new driver imperfection

Reimplemented in MSCFModel_KraussOrig1, MSCFModel_Daniel1, and MSCFModel_SmartSK.

Definition at line 273 of file MSCFModel.h.

References UNUSED_PARAMETER.

Referenced by TraCIServerAPI_VehicleType::setVariable().

virtual void MSCFModel::setMaxAccel ( SUMOReal  accel)
inlinevirtualinherited

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

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

Definition at line 257 of file MSCFModel.h.

References MSCFModel::myAccel.

Referenced by TraCIServerAPI_VehicleType::setVariable().

virtual void MSCFModel::setMaxDecel ( SUMOReal  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_Daniel1, and MSCFModel_SmartSK.

Definition at line 265 of file MSCFModel.h.

References MSCFModel::myDecel.

Referenced by TraCIServerAPI_VehicleType::setVariable().

SUMOReal MSCFModel_Wiedemann::stopSpeed ( const MSVehicle *const  veh,
const SUMOReal  speed,
SUMOReal  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 85 of file MSCFModel_Wiedemann.cpp.

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

Field Documentation

const SUMOReal MSCFModel_Wiedemann::D_MAX = 150
staticprivate

free-flow distance in m

Definition at line 178 of file MSCFModel_Wiedemann.h.

Referenced by _v(), and interactionGap().

const SUMOReal MSCFModel_Wiedemann::myAX
private

front-bumper to front-bumper distance

Definition at line 169 of file MSCFModel_Wiedemann.h.

Referenced by _v().

const SUMOReal MSCFModel_Wiedemann::myCX
private

perception threshold modifier

Definition at line 172 of file MSCFModel_Wiedemann.h.

Referenced by _v().

const SUMOReal MSCFModel_Wiedemann::myEstimation
private

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

Definition at line 166 of file MSCFModel_Wiedemann.h.

Referenced by _v(), and duplicate().

const SUMOReal MSCFModel_Wiedemann::myMinAccel
private

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

Definition at line 175 of file MSCFModel_Wiedemann.h.

Referenced by following(), and fullspeed().

const SUMOReal MSCFModel_Wiedemann::mySecurity
private

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

Definition at line 163 of file MSCFModel_Wiedemann.h.

Referenced by _v(), and duplicate().

const MSVehicleType* MSCFModel::myType
protectedinherited

The type to which this model definition belongs to.

Definition at line 289 of file MSCFModel.h.

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


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