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LIN SYSTEM DESIGN PROJECT FOR MIRROR AND DOOR

CONTROL IN CARS

NAME: ZEYD OKUTAN

STUDENT ID: 172754

INSTRUCTOR: PROF. GUIDO ALBERTENGO

SEMESTER: 2010/11 SUMMER


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1. INTRODUCTION

In advance there will be a design of LIN network for an automobile which needs basic

controls of doors and mirrors functions. In order to control all the sensors and

actuators, one main master, ECU (Engine Control Unit) will be needed in the center of

all.

In the design, 6 modules will be used in order to accomplish the control commands

given by the users. Also the user manual will be defined. The system architecture will

be defined as 4 modules for each door and 2 modules for each mirror.

2. MODULES

Module 1(D1): This module will work for the front left door functions as windows up-

down actuators, mirrors, puddle lamp sensor for the open door, a switch for car lock

(and also the open door sensor) and also the switches for all doors.

Module 2(D2): Module will control the front right door functions which are related

with window positioning sensors/actuators and also the door locks operations

switch/sensors and also the puddle lamp

Module 3(D3): Module will control the left rear functions which are related with

window positioning sensors/actuators and also the door locks operations


Module 4(D4): Module will control the rear right door functions which are related

with window positioning sensors/actuators and also the door locks operations


Module 5 (M1): This module will be functioning for the control of external mirror on

the left. Module will control the lighting, open-close of mirrors and the lateral-vertical

positioning of the mirror.

Module 6(M2): ): This module will be functioning for the control of external mirror

on the right. Module will control the lighting, open-close of mirrors and the lateral-

vertical positioning of the mirror.


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3. USER MANUAL

This section, the buttons and switches which are used by the occupants will bedefined.

a. Front Left (Driver):- 4 unit of window control switches- 1 switch to select the mirror (left-right)- 1 switch to turn the light on/off of the mirrors- 1 switch to flap the mirrors- 1 switch to move the mirror vertical direction- 1 switch to move the mirror horizontal direction- 1 switch to lock/unlock the drivers door- 1 switch to lock/unlock all the doors (child lock)

b. Front Right & Rear Doors:- 1 switch (per each) to window control- 1 switch for lock/unlock the door


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4. LIN NETWORK

With the start of the engine, ECU will begin to send messages to the modules in

order to get the position data from the sensors. These signals calledHeaders,

this is System Status Check will examine if there is any request from theoccupants.

After each module gets the signal from the Master, Modules (Slaves) send the

messages back.

Header Status

000100 Front-Left Door Check

000010 Front-Right Door Check

000001 Rear-Left Door Check

000011 Rear-Right Door Check

The headers are supposed to be 6 bites. There are some forbidden combinations

which cannot be used. (111111-111110-111101-111100)

Messages

Thus, after the slaves check the status they will sendMessages to the Master

about data taken by sensors. Messages will be different for driver door and forthe others:

Front Left Door (Drivers Controls)

1st

Bit Front-Left Door Window Move Up

2nd Bit Front-Left Door Window Move Down

3rd

Bit Front-Right Door Window Move Up

4th

Bit Front-Right Door Window Move Down

5th

Bit Rear-Left Door Window Move Up

6th

Bit Rear-Left Door Window Move Down

7th

Bit Rear-Right Door Window Move Up

8th

Bit Rear-Right Door Window Move Down

9th

Bit Door Sensor 0-Closed 1-Opened

10th

Bit Flap the Mirrors 0-Open 1-Close

11th

Bit Select the Mirrors 0-Left 1-Right

12th

Bit Mirror Lights 0-Light off 1-Light on

13th

Bit Move Mirror Up

14th

Bit Move Mirror Down

15th

Bit Move Mirror Left

16th

Bit Move Mirror Right

17th

Bit Unlock/Lock the Front-Left Door 0-Unlock 1-Lock

18th

Bit Unlock/Lock All the Doors (Child Lock) 0-Unlock 1-Lock

This message contains 18 bites of 24 bites which is 3bytes in total


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Front Right or Rear Doors

1st

Bit Door Sensor 0-Closed 1-Opened

2nd

Bit Window Move Down

3rd

Bit Window Move Up4

thBit Lock/Unlock the Door 0-Unlock 1-Lock

This message contains 4 bites of 8 bites total 1 Byte for Each

Commands

Messages consists information about the buttons and sensors. After the Master

(ECU) has all the messages from the modules, it can send signals calledCommands to the modules for actuation.

For the commands, every slave does not need to read all the commands in orderto response quickly, in fact they only read the headers in the command and then

they read the related command. So, a list of headers in commands can be made

for grouping them.

Group 1The Commands about Window Movements (with Header 000111)Group 2The Commands about Locking and Puddle Lights (with Header 000110)

Group 3The Commands about Mirrors (with Header 000101)

Then we can group the commands:

Group -1 (Windows) (000111)

1st

Bit Select Front/Rear Windows 0-Front 1-Rear

2nd

Bit Select Left/Right Windows 0-Left 1-Right

3rd

Bit Move the Window Upwards

4th

Bit Move the Window Downwards

1 Byte (4 Bites of 8)

Group2 (Locks & Puddle) (000110)

1st Bit Front Left Door Lock/Unlock 0Close 1 - Open

2nd

Bit Front Right Door Lock/Unlock 0Close 1 - Open

3rd

Bit Rear Left Door Lock/Unlock 0Close 1 - Open

4th

Bit Rear Right Door Lock/Unlock 0Close 1 - Open

5th

Bit Front Left Puddle Light 0Off 1 - On

6th

Bit Front Right Puddle Light 0Off 1 - On

7th

Bit Rear Left Puddle Light 0Off 1 - On

8th

Bit Rear Right Puddle Light 0Off 1 - On

1 Byte (8 Bites of 8)


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Group3 (Mirrors) (000101)

1st

Bit Flapping the Mirrors 0Close 1- Open

2nd

Bit Lighting the Mirrors 0Off 1 - On

3rd

Bit Selecting the Mirror 0Left 1 - Right4

thBit Move Up

5th

Bit Move Down

6th

Bit Move Left

7th

Bit Move Right

1 Byte (7 Bites of 8 Bites)

5. PROGRAMMING OF CONTROLLER

ECU will control the operations in a circulating algorithm. If the response timeof the slave is considered as 10ms at most, the loop can be described in some

steps:

#1 : Start of ECU

#2 : Send Header 1 (000100) for Front-Left Door Check

#3 : Wait 10 ms

#4 : Send Header 1 (000010) for Front-Right Door Check

#5 : Wait 10 ms

#6 : Send Header 1 (000001) for Rear-Left Door Check

#7 : Wait 10 ms

#8 : Send Header 1 (000011) for Rear-Right Door Check

#9 : Wait 10 ms

#10 : ECU considers all the data (messages) coming from the Doors

#11 : Send Header (000111) to all the Door Modules (D1-D2-D3-D4) for Windows

#12 : Send Header (000110) to all the Door Modules (D1-D2-D3-D4) for Locks & Puddles

#13 : Send Header (000101) to all the Mirror Modules (M1-M2) for Mirrors

#14 : Restart the Circulation

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