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Project 1- Traffic Jam Assistant Feature

CChetan Bairagi14 Feb 2022
HTMLMATLABMBD

Project 1- Traffic Jam Assistant Feature

Grading Policy

#

Requirements

Explanations

Maximum Marks

1

Simulink Model

The model should be developed as per MBD guidelines and submitted as .slx file with detail report

100

2

Simulink data dictionary

The SLDD must be created for this model and , .sldd file must be attached as separate file

25

3

Model Advisor Report

The model advisor check must be run again after developing the model.The image of report should be submitted

25

4

Code Generation

The model should be converted into code using Embedded coder and folder should be submitted

50

Traffic Jam Assistant Feature

Introduction to the Feature:

Traffic Jam Assistant is one of the most common feature in Advanced Driver Assistance System. Traffic Jam Assistant helps the driver arrive more relaxed at their destination, even in dense traffic or in traffic jams. As a partially automated comfort function, the system takes over the longitudinal & lateral guidance of the vehicle. This means that the car can drive off, accelerate & brake automatically, as well as steer the vehicle within certain constraints. The driver has to permanently supervise the system & be ready to take over the complete control of the vehicle at any time.

Traffic Jam Assistant system helps to avoid rear end collisions in dense traffic conditions & traffic jams. In Traffic jams, the vehicle takes over driving off, acceleration, braking and steering within same lane.

Basic Working Principle:

Traffic Jam Assistant is based on the sensors and the functionality of the Adaptive Cruise Control (ACC) with stop & go and Lane Keeping Support (LKS). When ACC ‘Stop & Go’ is turned ON, the Traffic Jam Assistant continuously analyses the speed of the surrounding vehicles and compares it with the own driving speed. If the system detects dense traffic or a traffic jam at speeds less than 60 kmph, the driver can activate the functionality by press of a button. The vehicle will now automatically follow the vehicle in front, takes over driving off, acceleration, braking and steering within same lane.

Information regarding the Traffic Jam Assistant will be available to be displayed to the driver in the Instrument Panel Cluster (IPC). The Algorithm which the students need to implement here in this project is predominantly based on IPC units.

Problem Statement:

To develop one specific requirement of Traffic Jam Assistant algorithm which would predominantly feature in the IPC algorithm. Please note that the whole Traffic Jam Assistant is a very huge algorithm & only one small part of the logic is implemented here. Idea is to familiarize with concepts of Model Based Development in MATLAB Environment. The Project must be done keeping in mind the following processes & steps.

  • This model must be developed in MATLAB Simulink as per MBD guidelines.
  • Code Generation Profile must be in Embedded Coder.
  • Simulink Data Dictionary must be created for the model & must be linked to the model.
  • Model Advisor Report is mandatory & this will be followed by Code Generation.

Input Signals:

Name of the Signal

Data Type

Range

Input_Voltage

uint8

0 - 255

Input_Switch

boolean

0 – 1

Enable_Display

uint8

0 - 255

Output Signal:

Name of the Signal

Data Type

Range

Output_Display

uint8

0 - 255

Calibration Signals:

Name of the Signal

Data Type

Range

Initial Value

VOLTAGE_MINIMUM_RANGE

uint8

0 – 255

30

VOLTAGE_MAXIMUM_RANGE

uint8

0 – 255

50

OFF_MODE

uint8

0 – 255

2

ON_MODE

uint8

0 – 255

1

STANDBY_MODE

uint8

0 – 255

3

INTERRUPT_1

boolean

0 – 1

1

INTERRUPT_2

boolean

0 - 1

1

NO_DISPLAY

uint8

0 – 255

0

Local Signal:

Name of the Signal

Data Type

Range

Optimum_Voltage

boolean

0 - 1

Requirement No 1:

  • Input Signal “Input_Voltage” is compared against voltage values “VOLTAGE_MINIMUM_RANGE” & “VOLTAGE_MAXIMUM_RANGE”.
  • Incoming input signal “Input_Voltage” must be greater than – equal to “VOLTAGE_MINIMUM_RANGE” and less than – equal to “VOLTAGE_MAXIMUM_RANGE”.
  • Output signal from here is “Optimum_Voltage” which will be one of the inputs to the subsystem “DisplayUnit”.

Requirement No 2 (DisplayUnit Subsystem):

  • Input Signals are “Optimum_Voltage”, “Input_Switch”,“Enable_Display”. Signal “Enable_Display” must be saturated between the range 0 – 7. Output signal from the subsystem is “Output_Display”.
  • Input Signal “Enable_Display” is compared against pre – defined set of values in a multiport switch. Total data ports in the multiport switch is 5.
  • Multiport switch inputs 1 & 2 is connected to calibration signal “ON_MODE”, Multiport switch inputs 3 & 4 is connected to calibration signal “OFF_MODE” while Multiport switch input 5 is connected to calibration signal “STANDBY_MODE”.
  • The output from Multiport switch is connected to the first input port of the Switch block. The third input port of the Switch block is connected to the calibration signal “NO_DISPLAY”.
  • Meanwhile NOT value of input signal “Input_Switch” is compared in an AND gate against input signal “Optimum_Voltage” and the output from comparing if calibration signals “INTERRUPT_1” & “INTERRUPT_2” are equal. The output of the AND gate is the second input of the switch block.
  • The output from the switch block is “Output_Display”.

_________________________________________________________________________________________

Steps :

  • Create Simulink Model As per MAAB Guid line . Create a Subsystem and rename “Traffic_Jam_Assist”
  • Take 3 Input and 1 Output Signals –

Enable_Display

Input_Voltage

Input_Switch

Output_Display

Picture 1 – Main Subsystem

  • Resolve Simulink signal name .
  • Create a Requirement 1 and Display Subsystem inside main subsystem Block
  • In the requirement 1 subsystem Input Signal “Input_Voltage” is compared against voltage values “VOLTAGE_MINIMUM_RANGE” & “VOLTAGE_MAXIMUM_RANGE” by using Relational operator block.
  • Incoming input signal “Input_Voltage” greater than – equal to “VOLTAGE_MINIMUM_RANGE” and less than – equal to “VOLTAGE_MAXIMUM_RANGE” making by Constant block.
  • Add both the block by AND gate and getting 1 Output ‘’Optimum_Voltage’’ .
  • Output signal from here is “Optimum_Voltage” which will be one of the inputs to the subsystem “DisplayUnit”.
  • Resolve Output Signal “Optimum_Voltage” .

Picture 2

Picture 3 - Requirement 1

  • Create a Display Subsystem by Requirement 2
  • As per requirement I insert Input Signals are “Optimum_Voltage”, “Input_Switch”,“Enable_Display”. Signal “Enable_Display”
  • Insert a saturation block (set range min 0 to max 7)
  • Input Signal “Enable_Display” is compared against pre – defined set of values in a multiport switch. Total data ports in the multiport switch is 5.
  • Multiport switch inputs 1 & 2 is connected to calibration signal “ON_MODE”, Multiport switch inputs 3 & 4 is connected to calibration signal “OFF_MODE” while Multiport switch input 5 is connected to calibration signal “STANDBY_MODE”.
  • The output from Multiport switch is connected to the first input port of the Switch block. The third input port of the Switch block is connected to the calibration signal “NO_DISPLAY”.
  • Meanwhile NOT value of input signal “Input_Switch” is compared in an AND gate against input signal “Optimum_Voltage” and the output from comparing if calibration signals “INTERRUPT_1” & “INTERRUPT_2”are equal. The output of the AND gate is the second input of the switch block.
  • Output from the switch block is “Output_Display” singal name for Output_Display resolved .

Picture 4 – Display Unit Subsystem

  • Propagate all the Input and Output Signals .
  • Create a SLDD file using step: MODELLING - Link DATA Dictionary - Create New – Save Same folder location – Apply.

Picture 5 – SLDD Menu

  • Add Signals and constant Data / Calibration Parameters as per Given Requirement

Picture 6 – SLDD

  • Check Model Settings as per C code Generation . select : Solver setting – Simulation stop time is 10 – Solver selection Fixed Step – Solver Discrete (no continues states) – Fundamental sample time is 0.01 also code generation settings : Select Targeted file – ert.tlc (embedded coder) – Toolchain – “LCC-Win64-V2.4.1…” and Apply- OK

Picture 7 – Model Setting

  • Run Model Advisor for checking Model as per “ Modelling Standard For MAAB”
  • Run Selected Check and generate report HTML or PDF
  • Save to main folder

Picture 8 – Model Advisor Report

  • Generate C-Code By clicking APPS tab – Code Generation – Embedded Coder – Build / Generate Code
  • After finishing code generation right side menu showing C-Code html file also create folder “Traffic_Jam_Assistant_Feature_ert_rtw” automatically . inside the folder all relevant .c .h ert… files .
  • Save that folder into Zip/rar File for uploading purpose.

Picture 9 – C-Code

  • C-Code generated in html:

/*

* File: Traffic_Jam_Assistant_Feature.c

*

* Code generated for Simulink model 'Traffic_Jam_Assistant_Feature'.

*

* Model version : 1.16

* Simulink Coder version : 9.6 (R2021b) 14-May-2021

* C/C++ source code generated on : Sun Feb 13 22:28:52 2022

*

* Target selection: ert.tlc

* Embedded hardware selection: Intel->x86-64 (Windows64)

* Code generation objectives: Unspecified

* Validation result: Not run

*/

#include "Traffic_Jam_Assistant_Feature.h"

#include "Traffic_Jam_Assistant_Feature_private.h"

/* Exported data definition */

/* ConstVolatile memory section */

/* Definition for custom storage class: ConstVolatile */

const volatile boolean_T INTERRUPT_1 = true;/* Referenced by: '<S2>/Constant3' */

const volatile boolean_T INTERRUPT_2 = true;/* Referenced by: '<S2>/Constant4' */

const volatile uint8_T NO_DISPLAY = 1U;/* Referenced by: '<S2>/Constant5' */

const volatile uint8_T OFF_MODE = 2U; /* Referenced by: '<S2>/Constant1' */

const volatile uint8_T ON_MODE = 1U; /* Referenced by: '<S2>/Constant' */

const volatile uint8_T STANDBY_MODE = 3U;/* Referenced by: '<S2>/Constant2' */

const volatile uint8_T VOLTAGE_MINIMUM_RANGE = 30U;/* Referenced by:

* '<S3>/Constant'

* '<S3>/Constant1'

*/

/* Real-time model */

static RT_MODEL_Traffic_Jam_Assistan_T Traffic_Jam_Assistant_Featur_M_;

RT_MODEL_Traffic_Jam_Assistan_T *const Traffic_Jam_Assistant_Featur_M =

&Traffic_Jam_Assistant_Featur_M_;

/* Model step function */

void Traffic_Jam_Assistant_Feature_step(void)

{

/* local block i/o variables */

boolean_T Optimum_Voltage;

/* Logic: '<S3>/AND' incorporates:

* Constant: '<S3>/Constant'

* Constant: '<S3>/Constant1'

* Inport: '<Root>/Input_Voltage'

* RelationalOperator: '<S3>/Relational Operator'

* RelationalOperator: '<S3>/Relational Operator1'

*/

Optimum_Voltage = ((Input_Voltage >= VOLTAGE_MINIMUM_RANGE) && (Input_Voltage <=

VOLTAGE_MINIMUM_RANGE));

/* Switch: '<S2>/Switch' incorporates:

* Constant: '<S2>/Constant3'

* Constant: '<S2>/Constant4'

* Inport: '<Root>/Input_Switch'

* Logic: '<S2>/AND'

* Logic: '<S2>/NOT'

* RelationalOperator: '<S2>/Relational Operator'

*/

if (Optimum_Voltage && (!Input_Switch) && (INTERRUPT_1 == INTERRUPT_2)) {

uint8_T tmp;

/* Saturate: '<S2>/Saturation' incorporates:

* Inport: '<Root>/Enable_Display'

*/

if (Enable_Display <= 7) {

tmp = Enable_Display;

} else {

tmp = 7U;

}

/* End of Saturate: '<S2>/Saturation' */

/* MultiPortSwitch: '<S2>/Multiport Switch' */

switch (tmp) {

case 1:

/* Switch: '<S2>/Switch' incorporates:

* Constant: '<S2>/Constant'

*/

Output_Display = ON_MODE;

break;

case 2:

/* Switch: '<S2>/Switch' incorporates:

* Constant: '<S2>/Constant'

*/

Output_Display = ON_MODE;

break;

case 3:

/* Switch: '<S2>/Switch' incorporates:

* Constant: '<S2>/Constant1'

*/

Output_Display = OFF_MODE;

break;

case 4:

/* Switch: '<S2>/Switch' incorporates:

* Constant: '<S2>/Constant1'

*/

Output_Display = OFF_MODE;

break;

default:

/* Switch: '<S2>/Switch' incorporates:

* Constant: '<S2>/Constant2'

*/

Output_Display = STANDBY_MODE;

break;

}

/* End of MultiPortSwitch: '<S2>/Multiport Switch' */

} else {

/* Switch: '<S2>/Switch' incorporates:

* Constant: '<S2>/Constant5'

*/

Output_Display = NO_DISPLAY;

}

/* End of Switch: '<S2>/Switch' */

}

/* Model initialize function */

void Traffic_Jam_Assistant_Feature_initialize(void)

{

/* (no initialization code required) */

}

/* Model terminate function */

void Traffic_Jam_Assistant_Feature_terminate(void)

{

/* (no terminate code required) */

}

/*

* File trailer for generated code.

*

* [EOF]

*/

  • Requirement Tagging : before tag the requirement open requirement Word File and select “requirement 1” then right click in the requirement 1 / Display model block and and select to word file . same steps for Display subsystem requirements select “ Display Model requirement” in the word file and the select requirement link with word file from right clicking the Display block in Simulink model.

Picture 10 – requirement tagging

END

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