Project 1- Traffic Jam Assistant Feature

Project 1- Traffic Jam Assistant Feature

Aim : To develop a MATLAB Simulink model for Traffic Jam Assistant Feature as per MBD guidelines and generate code.

Objective : To develop one specific requirement of Traffic Jam Assistant algorithm.

• 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.

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”.

Procedure :

Steps to create the simulink data Dictionary (SLDD) file :

• In simulink model Goto modeling tab -> Select model settings ->Model properties -> select External data
• Under External data tab we can see a blank tab Data Dictionary in that create the sldd file and uncheck the Enable model access to base workspace.
• Finally press ok now simulink data dictionary file is created succesfully with filename.sldd extension.

• In the simulink model select the modeling tab -> select model explorer.

• For constant parameter and output signal we need to give name for header file and definition file. Note keep always same name for all the constant parameters and output signals add in the data dictionary.

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”.

• Resolve the Input and output signals.
• To resolve the signals select the spectific signal and right click on it -> select properties.

Traffic_Jam_Assistant_Feature subsystem block :

Traffic_Jam_Assistant_Feature simulink model :

Tagging the requirements to the subsystems Requirement-1 & Requirement-2.

I. Tag the requirement to the Requirement-1 subsystem:

• For tag requirements in Requirement-1 subsystem first click on the subsystem and then right click on it -> Goto Requirements -> select 'Link to selection in word'.
• Meanwhile in word document highlight which of the thing need to tag.

II. Tag the requirement to the Requirement-2 subsystem:

- Similarly for tag requirements in Requirement-2 subsystem first click on the subsystem and then right click on it -> Goto Requirements -> select 'Link to selection in word'.

- Meanwhile in word document highlight which of the thing need to tag.

MBD compliant changes : Under modeling tab -> select model setting. Then the model setting dialoug box will open now.

Now a check is performed using Model Advisor tool in simulink to see whether the develped model meets the modeling standards for MAAB (MathWorks Automotive Advisory Board).

Finally generate the code for the created vehicle_direction_detection model.

• To generate code select the substem named as vehicle direction detection and then In matlab on the simulink model file embedded coder tool box is availabele under APPS tab click on it.
• A new tab C CODE is open next to the APPS tab under that tab click athe Generate Code.

File: traffic_jam_assistance.c
 *
 * Code generated for Simulink model 'traffic_jam_assistance'.
 *
 * Model version                  : 1.1
 * Simulink Coder version         : 9.8 (R2022b) 13-May-2022
 * C/C++ source code generated on : Tue May  9 15:41:24 2023
 *
 * Target selection: ert.tlc
 * Embedded hardware selection: Intel->x86-64 (Windows64)
 * Code generation objectives: Unspecified
 * Validation result: Not run
 */

#include "traffic_jam_assistance.h"
#include "rtwtypes.h"
#include "traffic_jam_assistance_private.h"
#include "traffic_jam_aa.h"

/* Real-time model */
static RT_MODEL_traffic_jam_assistan_T traffic_jam_assistance_M_;
RT_MODEL_traffic_jam_assistan_T *const traffic_jam_assistance_M =
  &traffic_jam_assistance_M_;

/* Model step function */
void traffic_jam_assistance_step(void)
{
  /* local block i/o variables */
  boolean_T Optimum_Voltage;

  /* Logic: '<S2>/AND' incorporates:
   *  Constant: '<S2>/Constant'
   *  Constant: '<S2>/Constant1'
   *  Inport: '<Root>/Input_Voltage'
   *  RelationalOperator: '<S2>/GreaterThanOrEqual'
   *  RelationalOperator: '<S2>/GreaterThanOrEqual1'
   */
  Optimum_Voltage = ((Input_Voltage >= VOLTAGE_MINIMUM_RANGE) && (Input_Voltage <=
    VOLTAGE_MAXIMUM_RANGE));

  /* Switch: '<S3>/Switch' incorporates:
   *  Constant: '<S3>/Constant6'
   *  Constant: '<S3>/Constant7'
   *  Inport: '<Root>/Input_Switch'
   *  Logic: '<S3>/AND'
   *  Logic: '<S3>/NOT'
   *  RelationalOperator: '<S3>/Equal'
   */
  if ((!Input_Switch) && Optimum_Voltage && (INTERRUPT_1 == INTERRUPT_2)) {
    uint8_T tmp;

    /* Saturate: '<S3>/Saturation' incorporates:
     *  Inport: '<Root>/Enable_Display'
     */
    if (Enable_Display <= 7) {
      tmp = Enable_Display;
    } else {
      tmp = 7U;
    }

    /* MultiPortSwitch: '<S3>/Multiport Switch' incorporates:
     *  Saturate: '<S3>/Saturation'
     */
    switch (tmp) {
     case 0:
      /* Switch: '<S3>/Switch' incorporates:
       *  Constant: '<S3>/Constant'
       */
      Output_Display = ON_MODE;
      break;

     case 1:
      /* Switch: '<S3>/Switch' incorporates:
       *  Constant: '<S3>/Constant1'
       */
      Output_Display = ON_MODE;
      break;

     case 2:
      /* Switch: '<S3>/Switch' incorporates:
       *  Constant: '<S3>/Constant2'
       */
      Output_Display = OFF_MODE;
      break;

     case 3:
      /* Switch: '<S3>/Switch' incorporates:
       *  Constant: '<S3>/Constant3'
       */
      Output_Display = OFF_MODE;
      break;

     default:
      /* Switch: '<S3>/Switch' incorporates:
       *  Constant: '<S3>/Constant4'
       */
      Output_Display = STANDBY_MODE;
      break;
    }

    /* End of MultiPortSwitch: '<S3>/Multiport Switch' */
  } else {
    /* Switch: '<S3>/Switch' incorporates:
     *  Constant: '<S3>/Constant5'
     */
    Output_Display = NO_DISPLAY;
  }

  /* End of Switch: '<S3>/Switch' */
}

/* Model initialize function */
void traffic_jam_assistance_initialize(void)
{
  /* (no initialization code required) */
}

/* Model terminate function */
void traffic_jam_assistance_terminate(void)
{
  /* (no terminate code required) */
}

/*
 * File trailer for generated code.
 *
 * [EOF]
 */

Conclusion:

The MATLAB Simulink model for Traffic_Jam_Assistant_Feature is developed as per the given requirements, Tagged the requirements totheir corresponding subsystems requirement 1 & requirement 2, Simulink Data Dictionary file has been created and the code is generated using Embedded Coder in Simulink.