Challenge

Project 1- Traffic Jam Assistant Feature

SSunkara Prema Kumar1 Feb 2022

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”.

ANS:-

1.AIm:-

Model Development of a single feature of Traffic Jam Assist using MATLAB & Simulink as well as Code Generation using Embedd coder..

Traffic Jam Assistant Feature

2.Objective:-

Model Development as per MBD guidelines.
Creation of Simulink Data Dictionary.
Code Generation using Embedded Coder.
Generating Model Advisor Report.

3.Traffic Jam Assistant Feature:-

Introduction to the Feature:-

Basic Working Principle:-

Fig:-Traffic Jam Assistant Feature

Traffic Jam Assist is pretty much an extension of Adaptive Cruise Control. Traffic Jam Assist works when you approach to traffic and slow to a crawl. With the system on, you can take your foot off the pedals. Traffic Jam Assist brakes and accelerates the car for you while maintaining a safe distance from the vehicle infront. This is essentially a low-speed version of Adaptive Cruise Control.

Adaptive Cruise Control tries to maintain your set speed but takes other vehicles into account. Let’s say you set your cruising speed to 90km/h, but the vehicle infront of your car is only doing 80km/h due to traffic. Adaptive Cruise Control will maintain a safe distance from the vehicle in front. Your car will not travel at 90km/h. Traffic Jam Assist works when the driver has his or her hands on the wheel. Most systems are designed to disengage if the driver’s hands leave the wheel for too long. This is done to help ensure that the driver can take over in case of an emergency.

Like Adaptive Cruise Control, Traffic Jam Assist systems err on the side of caution and leave big gaps to the vehicle in front. In places like Singapore, expect cars to filter into your lane. Impatient drivers behind you may even honk and/or flash their headlights. Traffic Jam Assist isn’t very reactive either. An attentive driver who is situationally aware will be able to start accelerating the car faster, too. Also, when we are stationary for too long, the system won’t move the car when traffic starts to move. We need to tap the accelerator pedal to “re-activate” Traffic Jam Assist.

Traffic Jam Assistant of SKODA:-

https://www.bing.com/videos/search?view=detail&mid=44DDC68C1244AFCBFB0E44DDC68C1244AFCBFB0E&q=traffic jam assistant feature&shtp=GetUrl&shid=6bdc067c-818d-470c-99ad-2091a48d29ad&shtk=VHJhZmZpYyBKYW0gQXNzaXN0YW50&shdk=VHJhZmZpYyBKYW0gQXNzaXN0YW50IEVOIDA1&shhk=shxBoVtr%2FyCD5449vDzZHqg8ATQEkdTpu1idAHRK0%2Bk%3D&form=VDSHOT&shth=OVP.bGWPJqFnV-6mMZIKEOviVQEsCo

4.Signals & Calibration Data List:-
Input Signals:-

Output Signal:-

Calibration Signals:-

Local Signal:-

5.Requirements:
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”.

6.Procedure:-
The very first thing that we will do is create a Simulink Data Dictionary using the given Signal and Calibration Data List.
The following is the SLDD file

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”.

As per Requirement 1, Input_Voltage is compared with VOLTAGE_MINIMUM_RANGE and VOLTAGE_MAXIMUM_RANGE.

inside of the requiremnet 1 subsystem

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”.

inside of the requirement2 subsystem

Traffic Jam Assistant Feature:-

7.Requirement-1 Tagging of subsystem:-

Requirement-2 Tagging of subsystem:-

8.Model configuration parameters Updated:-

9.Signal Resolution for inputs and outputs:-
the inputs and output signals are resolved so the signals will take the values from sldd and pass them to the logical blocks. Otherwise, it may take some junkvalues if it is unresolved

10.

11.Simulation:-

The model is simulated too for checking for errors and warmings

12.Model Advisory Report:-

By running the model advisor tool, we can see commonly made modeling errors.

13.Code generation:-

Build a model for generating code

14.Generated Code :-

* File: Traffic_Jam_Assistant.c

* Code generated for Simulink model 'Traffic_Jam_Assistant'.

* Model version : 1.20

* Simulink Coder version : 9.5 (R2021a) 14-Nov-2020

* C/C++ source code generated on : Tue Feb 1 14:50:42 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 */

/* 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: '/VOLTAGE_MAXIMUM_RANGE' */

const volatile uint8_T VOLTAGE_MINIMUM_RANGE = 30U;

/* Referenced by: '/VOLTAGE_MINIMUM_RANGE' */

/* External outputs (root outports fed by signals with default storage) */

ExtY_Traffic_Jam_Assistant_T Traffic_Jam_Assistant_Y;

/* 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: '/AND' incorporates:

* Constant: '/VOLTAGE_MAXIMUM_RANGE'

* Constant: '/VOLTAGE_MINIMUM_RANGE'

* Inport: '/Input_Voltage'

* RelationalOperator: '/greater than – equal to'

* RelationalOperator: '/less than – equal to'

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: '/AND1'

* Logic: '/AND2'

* Logic: '/NOT'

* RelationalOperator: '/equal'

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

/* Saturate: '/Saturation' incorporates:

* Inport: '/Enable_Display'

if (Enable_Display < 1) {

tmp = 0U;

} else {

tmp = 1U;

}

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

/* MultiPortSwitch: '/Multiport Switch' */

if (tmp == 1) {

/* Outport: '/Output_Display' incorporates:

* Constant: '/ON_MODE'

Traffic_Jam_Assistant_Y.Output_Display = ON_MODE;

} else {

/* Outport: '/Output_Display' incorporates:

* Constant: '/STANDBY_MODE'

Traffic_Jam_Assistant_Y.Output_Display = STANDBY_MODE;

}

/* End of MultiPortSwitch: '/Multiport Switch' */

} else {

/* Outport: '/Output_Display' incorporates:

* Constant: '/NO_DISPLAY'

Traffic_Jam_Assistant_Y.Output_Display = NO_DISPLAY;

}

/* End of Switch: '/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]

Project 1- Traffic Jam Assistant Feature

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Ship work like thisin your own course.

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Ship work like this
in your own course.