Project 1- Traffic Jam Assistant Feature

Objective:

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.

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.

Model Developed:

Subsystems generated

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”.

SLDD file created is

Configuration parameters

Model advisor check for MAB guidelines

Code generated is

/*
 * File: traffic_jamfeature.c
 *
 * Code generated for Simulink model 'traffic_jamfeature'.
 *
 * Model version                  : 1.5
 * Simulink Coder version         : 9.5 (R2021a) 14-Nov-2020
 * C/C++ source code generated on : Sat Jul  2 13:14:29 2022
 *
 * Target selection: ert.tlc
 * Embedded hardware selection: Intel->x86-64 (Windows64)
 * Code generation objectives: Unspecified
 * Validation result: Not run
 */

#include "traffic_jamfeature.h"
#include "traffic_jamfeature_private.h"

/* Exported data definition */

/* Definition for custom storage class: ExportToFile */
uint8_T Output_Display;                /* '/Switch' */

/* ConstVolatile memory section */
/* Definition for custom storage class: ConstVolatile */
const volatile boolean_T INTERRUPT_1 = 1;/* Referenced by: '/INTERRUPT_1' */
const volatile boolean_T INTERRUPT_2 = 1;/* Referenced by: '/INTERRUPT_2' */
const volatile uint8_T NO_DISPLAY = 0U;/* Referenced by: '/NO_DISPLAY' */
const volatile uint8_T OFF_MODE = 2U;  /* Referenced by: '/OFF_MODE' */
const volatile uint8_T ON_MODE = 1U;   /* Referenced by: '/ON_MODE' */
const volatile uint8_T STANDBY_MODE = 3U;/* Referenced by: '/STANDBY_MODE' */
const volatile uint8_T VOLTAGE_MAXIMUM_RANGE = 50U;/* Referenced by: '/Constant' */
const volatile uint8_T VOLTAGE_MINIMUM_RANGE = 30U;/* Referenced by: '/Constant' */

/* Real-time model */
static RT_MODEL_traffic_jamfeature_T traffic_jamfeature_M_;
RT_MODEL_traffic_jamfeature_T *const traffic_jamfeature_M =
  &traffic_jamfeature_M_;

/* Model step function */
void traffic_jamfeature_step(void)
{
  /* local block i/o variables */
  boolean_T Optimum_Voltage;
  uint8_T tmp;

  /* Logic: '/AND' incorporates:
   *  Constant: '/Constant'
   *  Constant: '/Constant'
   *  Inport: '/Input_Voltage'
   *  RelationalOperator: '/Compare'
   *  RelationalOperator: '/Compare'
   */
  Optimum_Voltage = ((Input_Voltage >= VOLTAGE_MINIMUM_RANGE) && (Input_Voltage <=
    VOLTAGE_MAXIMUM_RANGE));

  /* Switch: '/Switch' incorporates:
   *  Constant: '/INTERRUPT_1'
   *  Constant: '/INTERRUPT_2'
   *  Inport: '/Input_Switch'
   *  Logic: '/AND'
   *  Logic: '/NOT'
   *  RelationalOperator: '/Relational Operator'
   */
  if (Optimum_Voltage && (!Input_Switch) && (INTERRUPT_1 == INTERRUPT_2)) {
    /* Saturate: '/Saturation' incorporates:
     *  Inport: '/Enable_Display'
     */
    if (Enable_Display < 7) {
      tmp = Enable_Display;
    } else {
      tmp = 7U;
    }

    /* End of Saturate: '/Saturation' */

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

     case 1:
      /* Switch: '/Switch' incorporates:
       *  Constant: '/ON_MODE'
       */
      Output_Display = ON_MODE;
      break;

     case 2:
      /* Switch: '/Switch' incorporates:
       *  Constant: '/OFF_MODE'
       */
      Output_Display = OFF_MODE;
      break;

     case 3:
      /* Switch: '/Switch' incorporates:
       *  Constant: '/OFF_MODE'
       */
      Output_Display = OFF_MODE;
      break;

     default:
      /* Switch: '/Switch' incorporates:
       *  Constant: '/STANDBY_MODE'
       */
      Output_Display = STANDBY_MODE;
      break;
    }

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

  /* End of Switch: '/Switch' */
}

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

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

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

CONCLUSION

• The model for Traffic jam feature was developed in MATLAB and SIMULINK.
• Code generation profile was changed to embedded coder.
• Simulink data dictionary was created and the signals and constants are linked to the model
• Model advisory check was done and the report was generated.