Description

Path-following driver system using a P-like lateral steering controller with variable path prediction.

See also: ChPathSteeringControllerSR; ChSpeedController

#include <ChPathFollowerDriver.h>

Inheritance diagram for chrono::vehicle::ChPathFollowerDriverSR:

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Collaboration diagram for chrono::vehicle::ChPathFollowerDriverSR:

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Public Member Functions
	ChPathFollowerDriverSR (ChVehicle &vehicle, std::shared_ptr< ChBezierCurve > path, const std::string &path_name, double target_speed, double maxWheelTurnAngle=0.0, double axle_space=2.5, double zero_duration=0, double ramp_duration=0)
	Construct using the specified Bezier curve. More...

	ChPathFollowerDriverSR (ChVehicle &vehicle, const std::string &steering_filename, const std::string &speed_filename, std::shared_ptr< ChBezierCurve > path, const std::string &path_name, double target_speed, double maxWheelTurnAngle=0.0, double axle_space=2.5, double zero_duration=0, double ramp_duration=0)
	Construct using JSON specification files. More...

ChPathSteeringControllerSR &	GetSteeringController () const
	Get the underlying steering controller object.

Public Member Functions inherited from chrono::vehicle::ChClosedLoopDriver
void	SetDesiredSpeed (double val)
	Set the desired vehicle speed.

void	SetThresholdThrottle (double val)
	Specify the throttle value below which braking is enabled. More...

ChSpeedController &	GetSpeedController () const
	Get the underlying speed controller object.

void	Reset ()
	Reset the underlying controllers.

virtual void	Initialize () override
	Initialize this driver system.

virtual void	Advance (double step) override
	Advance the state of this driver system by the specified duration.

void	SetColor (const ChColor &color)
	Set color of path visualization.

void	ExportPathPovray (const std::string &out_dir)
	Export the Bezier curve for POV-Ray postprocessing.

Public Member Functions inherited from chrono::vehicle::ChDriver
	ChDriver (ChVehicle &vehicle)
	Construct a driver subsystem associated with the given vehicle.

double	GetThrottle () const
	Get the driver throttle input (in the range [0,1]).

double	GetSteering () const
	Get the driver steering input (in the range [-1,+1]).

double	GetBraking () const
	Get the driver braking input (in the range [0,1]).

double	GetClutch () const
	Get the driver clutch input (in the range [0,1]).

DriverInputs	GetInputs () const
	Get all current inputs at once.

virtual void	Synchronize (double time)
	Update the state of this driver system at the current time.

bool	LogInit (const std::string &filename)
	Initialize output file for recording driver inputs.

bool	Log (double time)
	Record the current driver inputs to the log file.

void	SetSteering (double steering)
	Overwrite the value for the driver steering input (input is clamped in [-1,+1]).

void	SetThrottle (double throttle)
	Overwrite the value for the driver throttle input (input is clamped in [0,+1]).

void	SetBraking (double braking)
	Overwrite the value for the driver braking input (input is clamped in [0,+1]).

void	SetClutch (double clutch)
	Overwrite the value for the clutch braking input (input is clamped in [0,+1]).

Additional Inherited Members
Protected Member Functions inherited from chrono::vehicle::ChClosedLoopDriver
	ChClosedLoopDriver (ChVehicle &vehicle, const std::string &path_name, double target_speed, double zero_duration, double ramp_duration)
	Construct using the specified Bezier curve. More...

	ChClosedLoopDriver (ChVehicle &vehicle, const std::string &speed_filename, const std::string &path_name, double target_speed, double zero_duration, double ramp_duration)
	Construct using JSON specification files. More...

Protected Attributes inherited from chrono::vehicle::ChClosedLoopDriver
std::unique_ptr< ChSteeringController >	m_steeringPID
	steering controller

std::unique_ptr< ChSpeedController >	m_speedPID
	speed controller

double	m_target_speed
	desired vehicle speed

std::string	m_pathName
	for path visualization

ChColor	m_color
	for path visualization

double	m_throttle_threshold
	throttle value below which brakes are applied

double	m_zero_duration
	initial duration with zero driver outputs

double	m_ramp_duration
	time to ramp up throttle from 0

Protected Attributes inherited from chrono::vehicle::ChDriver
ChVehicle &	m_vehicle
	reference to associated vehicle

double	m_throttle
	current value of throttle input

double	m_steering
	current value of steering input

double	m_braking
	current value of braking input

double	m_clutch
	current value of clutch input

Constructor & Destructor Documentation

◆ ChPathFollowerDriverSR() [1/2]

chrono::vehicle::ChPathFollowerDriverSR::ChPathFollowerDriverSR	(	ChVehicle &	vehicle,
		std::shared_ptr< ChBezierCurve >	path,
		const std::string &	path_name,
		double	target_speed,
		double	maxWheelTurnAngle = `0.0`,
		double	axle_space = `2.5`,
		double	zero_duration = `0`,
		double	ramp_duration = `0`
	)

Construct using the specified Bezier curve.

Parameters

vehicle	associated vehicle
path	Bezier curve with target path
path_name	name of the path curve
target_speed	constant target speed
maxWheelTurnAngle	needed for wheeled vehicles, use default for tracked vehicles
axle_space	needed for course prediction
zero_duration	initial duration with zero driver outputs
ramp_duration	time to ramp up throttle from 0

◆ ChPathFollowerDriverSR() [2/2]

chrono::vehicle::ChPathFollowerDriverSR::ChPathFollowerDriverSR	(	ChVehicle &	vehicle,
		const std::string &	steering_filename,
		const std::string &	speed_filename,
		std::shared_ptr< ChBezierCurve >	path,
		const std::string &	path_name,
		double	target_speed,
		double	maxWheelTurnAngle = `0.0`,
		double	axle_space = `2.5`,
		double	zero_duration = `0`,
		double	ramp_duration = `0`
	)

Construct using JSON specification files.

The two files must contain specification for the path-follower steering controller and the constant-speed controller, respectively.

Parameters

vehicle	associated vehicle
steering_filename	JSON file with steering controller specification
speed_filename	JSON file with speed controller specification
path	Bezier curve with target path
path_name	name of the path curve
target_speed	constant target speed
maxWheelTurnAngle	needed for wheeled vehicles, use default for tracked vehicles
axle_space	needed for course prediction
zero_duration	initial duration with zero driver outputs
ramp_duration	time to ramp up throttle from 0

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

/builds/uwsbel/chrono/src/chrono_vehicle/driver/ChPathFollowerDriver.h
/builds/uwsbel/chrono/src/chrono_vehicle/driver/ChPathFollowerDriver.cpp

Description

Public Member Functions

Additional Inherited Members

Constructor & Destructor Documentation

◆ ChPathFollowerDriverSR() [1/2]

◆ ChPathFollowerDriverSR() [2/2]