Project 1- Traffic Jam Assistant Feature

AIM: To develop one specific requirement of the Traffic Jam Assistant algorithm which would predominantly feature in the IPC algorithm.

OBJECTIVE:-

• 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.

THEORY:-

Traffic Jam Assistant Feature

Introduction:-

Traffic Jam Assistant is one of the most common features in the 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 complete control of the vehicle at any time.

The 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 the 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 with the press of a button. The vehicle will now automatically follow the vehicle in front, takes over driving off, acceleration, braking, and steering within the 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.

TOP LAYER OF SIMULINK MODEL:-

Inside the Traffic_jam_Assistant subsystem

Requirement No 1 Subsystem :

• 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”.

• The 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”, and “Enable_Display”. Signal “Enable_Display” must be saturated between the range 0 – 7. The output signal from the subsystem is “Output_Display”.

• Input Signal “Enable_Display” is compared against a pre-defined set of values in a multiport switch. The total data ports in the multiport switch are 5.

• Multiport switch inputs 1 & 2 are connected to calibration signal “ON_MODE”, Multiport switch inputs 3 & 4 are connected to calibration signal “OFF_MODE” while Multiport switch input 5 is connected to calibration signal “STANDBY_MODE”.

• The output from the 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 the value of the input signal “Input_Switch” is compared in an AND gate against the 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 SLDD file as per given input signal, output signals, local signal, and calibration values and linked it to the model using the tool Link to the Data dictionary

• Given input signals, output signals and calibration value are as follows:-

Model advisor check: For MAB guidelines.

• Here, under Modelling click on the Model Advisor tool present on the extreme right to run the Model advisory check for MAB guidelines which can be found under By Task.

• Preview of Generated Model Advisor Report

Code generation :

• Here we first configure the code generation tab in model settings, wherein we choose ert. tlc(embedded coder) as the System Target File.

• After this we use Generate code tool to generate the code.

• Code Generation Report

Generated Code preview:-

Generated Code:-

/*
 * File: Traffic_Jam_Assistant.c
 *
 * Code generated for Simulink model 'Traffic_Jam_Assistant'.
 *
 * Model version                  : 1.23
 * Simulink Coder version         : 9.5 (R2021a) 14-Nov-2020
 * C/C++ source code generated on : Sat Jul 23 12:24:45 2022
 *
 * Target selection: ert.tlc
 * Embedded hardware selection: Intel->x86-64 (Windows64)
 * Code generation objectives: Unspecified
 * Validation result: Not run
 */

#include "Traffic_Jam_Assistant.h"
#include "Traffic_Jam_Assistant_private.h"

/* Exported data definition */

/* Definition for custom storage class: ExportToFile */
uint8_T Output_Display;                /* '<S2>/Switch' */

/* ConstVolatile memory section */
/* Definition for custom storage class: ConstVolatile */
const volatile boolean_T INTERRUPT_1 = 1;/* Referenced by: '<S2>/Constant4' */
const volatile boolean_T INTERRUPT_2 = 1;/* Referenced by: '<S2>/Constant5' */
const volatile uint8_T NO_DISPLAY = 0U;/* Referenced by: '<S2>/Constant3' */
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_MAXIMUM_RANGE = 50U;/* Referenced by: '<S4>/Constant' */
const volatile uint8_T VOLTAGE_MINIMUM_RANGE = 30U;/* Referenced by: '<S5>/Constant' */

/* Real-time model */
static RT_MODEL_Traffic_Jam_Assistan_T Traffic_Jam_Assistant_M_;
RT_MODEL_Traffic_Jam_Assistan_T *const Traffic_Jam_Assistant_M =
  &Traffic_Jam_Assistant_M_;

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

  /* Logic: '<S3>/OR' incorporates:
   *  Constant: '<S4>/Constant'
   *  Constant: '<S5>/Constant'
   *  Inport: '<Root>/Input_Voltage'
   *  RelationalOperator: '<S4>/Compare'
   *  RelationalOperator: '<S5>/Compare'
   */
  Optimum_Voltage = ((Input_Voltage <= VOLTAGE_MAXIMUM_RANGE) || (Input_Voltage >=
    VOLTAGE_MINIMUM_RANGE));

  /* Switch: '<S2>/Switch' incorporates:
   *  Constant: '<S2>/Constant4'
   *  Constant: '<S2>/Constant5'
   *  Inport: '<Root>/Input_Switch'
   *  Logic: '<S2>/AND'
   *  Logic: '<S2>/NOT'
   *  RelationalOperator: '<S2>/Relational Operator'
   */
  if (Optimum_Voltage && (!Input_Switch) && (INTERRUPT_1 == INTERRUPT_2)) {
    /* 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>/Constant3'
     */
    Output_Display = NO_DISPLAY;
  }

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

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

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

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

CONCLUSION: Successfully build the Simulink Model on Traffic jam assistant feature as per the given requirement in Matlab environment and ran for model advisor check and generated code of the model.