Project 1- Traffic Jam Assistant Feature

AIM:

To develop a Matlab Simulink model of traffic jam assistant feature under the MBD guidelines.

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.

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”.

Model:

• As per the given requirements, I have designed a model under the MBD guidelines are shown below.

• As per the requirements I have created a subsystem and give the three inputs as enable_display,input_switch, and Input_voltage.

• Inside the main subsystem I have created the two subsystem are named as requirment_1 and enable_display are shown above.

• Inside the subsystem requirement, I have to use the relational operator to compare the given input with the gate as per the requirement and give the output as optimum_voltage.
• After that requirement_1 output should be given ad display unit next subsystem output.

• Based upon the requirment I have use the multiport switch and given the input as enable_display and compared with the optimum voltage and the input switch by using the logical and relational operators are shown above.

Simulink Data Dictionary creation:

• In this model I have created the sldd file then resolver and propagate that.

Requirement Tagging:

• As per the requirment tagging, I have updated model details in the ms word file and I have to tag my design are shown above.

• Once we select the option means automatically it can highlight the details in the ms word can be shown below.

Model advisor check:

• The model advisor is a checking method available in the Simulink.which automatically checks the errors as per the pre-defined check.

• In this model, I have rectified the errors and generated the report that are shown below.

Code Generation:

• In this model I have automatically generated the code as per my designed model are shown below.

• For making the code generation I can select the apps option which is available on the top of the Simulink toolbar and select the embaded code option are shown above.
• Then select the build option to genete the c code.

• After generation of code the code should be stored in the folder are shown below.