基于LIN总线的汽车智能雨刷设计外文文献翻译、中英文翻译、外文翻译

外文文献及译文

文献、资料题目：

Design and Implementation Intelligent

Car Wiper Based on LIN Bus

文献、资料来源：

Trans Tech

期刊

文献、资料发表（出版）日期：

2012

< br>年

04

月

12

< br>日

学生姓名：

学号：

系

别：

专

业：

指导教师：

职称：

2017

年

5

月

19

日

Design and Implementation intelligent car wiper based on LIN

Bus

Abstract

：

Contrary

to

the

problem

that

the

process

of

rainy

car

manual

manipulation

causes much interference to the driver, a design method for intelligent car wiper based on

the LIN bus is proposed. It adopts the chips MC9S08DZ60 and MC33661 as the controller

from Freescale that dedicated to the automotive electronics field. During its working, with

the

rain

sensor

sensing

the

magnitude

of

outside

rainfall,

it

can

automatically

adjust

the

wiper speed, achieving the intelligent wiper control.

Keywords:

Rain wiper control, LIN bus, Intelligent, Freescale.

1

Introduction

The number of wiring harnesses is increasing at the double speed by the growing in the

quantity of automotive electronic components. The increasing of wiring harness occupies

the interior effective space and enlarges the cost of vehicle. On the other hand, it impedes

the

improvement

of

vehicle

reliability.

LIN

bus,

as

a

low-cost

serial

bus

technology

meeting

the

requirements

of

car

body

electronics,

can

provide

a

low- cost

and

short-distance network connection for electric machines, switches, sensors and light

[1]

.

As an important

part of

the electronic automotive vehicle,

car

wiper

plays a particularly

important role in the rain and fog weather. At present, the automobile wiper control system

in the market mainly adjusts wiper speed through manually. The manual adjustment will

not only cause some interference to the driver's energy but also can not promptly respond

to

the

sudden

incident

such

as

rain

splashing

on

the

windshield,

increasing

the

accident

probability. Therefore, it’s especially important to install the intelligent car wiper on the car

body.

Based on the above introduction, the text designs and implements an intelligent car wiper

based on the LIN bus. We select the Freescale chip MC9S08DZ60 and MC33661 as the

controller to complete the hardware design and communicate with the rainfall monitoring

devices or central controller through the LIN bus. Its overall block diagram can be seen in

Figure 1.

Fig.1 The overall block diagram of intelligent car wiper

LIN bus protocol

2

Protocol Overview

：

LIN bus network consists of a master node and several slave nodes.

Each node contains a secondary

communication task decomposed to

the

task of sending

and receiving. The master node also contains an additional major sending task. The LIN

bus communication is

usually

composed of the

responses

generated by the master node,

namely the main task and the secondary task

[2]

.

There are several main features in the LIN protocol. First, it’s in low cost and carried out

based on the common SCI / UART interface. Secondly, it uses the mode of one master and

several

slaves.

The

data

priority

is

determined

by

the

master

node

and

can

be

changed

flexibly according to the need. Lastly, the delay time of signal transmission can be ensured.

The highest transfer rate can reach up to 20kb/s and its largest bus length is 40m.

Message Frame Structure

：

The formation of message frame from LIN bus includes the

header and the response. The header is made up of interrupt, synchronization and protected

identifier.

The

response

consists

of

data

field

and

check

sum,

of

which

the

data

field

includes one to eight data bytes. All the other fields in the message frame except interrupt

follow

the

byte

and

can

be

generated

by

the

serial

communication

interface

of

microcontroller.

Hardware design and achievement

This

design

uses

the

microchip

MC9S08DZ60

as

the

main

chip

and

is

powered

by

the

MC3388. The main chip connects with the wiper controller MC33486 through I/O ports to

control the rotating direction and speed of the wiper electric machine. The sensor KM241

as

the

detecting

device

of

wiper

machine

gets

its

speed

and

position

and

sends

to

the

microcontroller by AD ports. Meanwhile, it communicates with rainfall monitoring device

and MCU module through the LIN controller MC33661[3]. The overall circuit is shown in

Figure 2.

3

Fig.2 The overall schematic of intelligent car wiper

MCU module

：

As shown in Figure 2, we select the Freescale chip MC9S08DZ60 as the

microcontroller. It is 8-bit microchip in higher integration and powerful function specially

designed for the automobile field, providing the Freescale embedded CAN, EEPROM and

on-chip emulation/debug module in the lowest cost. The chip has an internal flash memory

of

60K,

RAM

memory

of

2K

and

E2PROM

memory

of

1K.

MC9S08DZ60

can

communicate with peripheral intelligent chip using SPI module of which the SCI module

can achieve the LIN bus communication

[4]

.

Power module

：

The power module is the device that provides voltage conversion to wiper

controller. The voltage of power supply in the car battery is 12V DC while the MCU, LIN

transceiver and Hall sensor are the power supply device in 5V

, therefore, the power module

needs to convert 12V to 5V and supply to them.

The chip MC33889

：

is selected for the power management. It can work in the car ultimate

application range of -40

℃

to 125

℃

with CAN physical layer and voltage stabilization. It

has

internal

watchdog

timer

and

local

wake-up

circuit

providing

MCU

a

stable

5V

operating voltage. In addition, its integrated design reduces packaging cost and increases

the design flexibility.

Wiper

electric

module

：

Wiper

electric

module

works

with

the

PWM

output

by

4

microcontroller

going

with

intelligent

power

components

to

adjust

the

speed

of

electric

machine

and

drive

the

forward

and

reverse

rotation

of

wiper

machine.

Moreover,

it

can

make appropriate response to the condition whether the machine was blocked.

Wiper control module adopts MC33486 to be the controller of which the stable output is up

to

10A,

especially

meeting

the

control

requirements

in

positive

and

inverse

phase

demanding

high

power

and

impact

current

such

as

the

electric

window

machine,

wiper

machine

and

so

on.

In

the

regulation

for

wiper

machine,

two

different

power

output

modules respectively control the coil of wiper electric machine in high and low speed.

Detecting device for wiper machine

：

Intelligent car wiper need to make real-time monitor

and control to wiper rotation so that it’s necessary to monitor the status of wiper machine

such as position , speed, temperature and so on. The system selects the Hall sensor KMZ41

to

work

with

the

microchip

so

that

the

angle

signal

within

the

range

of

180°

can

be

measured.

After

detecting

the

position

of

wiper

machine,

the

microcontroller

will

determine whether current position is correct. If not, it makes the electric machine rotate to

the

correct

position.

Then,

after

detecting

its

speed,

the

single-chip

receives

the

number

and compares it to given value to make wiper machine run in the most accurate speed.

Software design and achievement

In this design, we use software simulation to achieve the intermittent operation of wiper

machine. Timing 3s by the system timer, the MCU outputs chip selection signals of wiper

machine

to

MC33486.

Then,

the

gear

judge

is

entered

and

the

corresponding

switch

variables are read to carry out the wiper operation.

Software design of wiper machine

：

When the microcontroller detects the condition that

wiper

switch

is

pressed,

it

will

judge

the

gear

and

enable

MC33486

to

complete

the

corresponding wiper control operations according to different gears. First, it determines the

gear

and

carries

out

error

detection

as

well

as

marking

the

error

counting

variable.

If

everything

is

normal,

the

appropriate

action

will

be

taken.

The

total

flow

of

software

5

design is shown in Figure 3.

Fig.3 The total flow chart of software design for wiper machine

LIN

drive

and

software

design

of

the

wiper

system

：

According

to

the

LIN

2.X

specification,

the

master control node sends LIN messages and the slave nodes feedback them. Only when receiving the

query frame from the master node could the slave node send feedback frame to the master node.

LIN communication need to configure two files:

including

the

receiving

and

sending

direction

of

ID

and

frame

length.

The

document

mainly

defines the baud rate, clock, and bit time of SCI communication. Configured with these two files, the

register definition in

DZ60 and set the interrupt vector.

After configuring the above conditions, the data sending can be achieved by the steps shown in Figure 4.

Figure 5 is the flow chart of data receiving in the master node. To the slave node, the LIN_MsgStatus

(MsgId) should be called and determine whether the data under ID is LIN_OK. If there is data, the ID

data in the buffer can be transferred to *data which is defined by user by calling LIN_GetMsg (MsgId ,

*data).

6

Fig.4 Data sending

Fig.5 Data reception flowchart of master node

Conclusion

Contrary

to

the disadvantages of the

existing wiper

control system, the text

proposes

an

intelligent car wiper control system based on LIN bus. It can control the speed of wiper

machine

based

on

rainfall

information

and

achieve

the

communication

between

wiper

controller

and

ECU

through

the

LIN

bus,

making

the

wiper

intelligent.

In

addition,

the

extensive

application

of

LIN

bus

in

the

automobile

field

encourages

more

devices

supporting LIN protocol to be produced. After doing some modifications to MC9S08DZ60,

the system can achieve the data transmission with other automobile devices, increasing the

design flexibility.

Acknowledgment

This

paper

is

supported

by

Tianjin

Social

Development

key

Foundation

of

China

(NO.

09ZCGYSF00300)

and

Tianjin

Key

Laboratory

for

Control

Theory

and

Application

in

Complicated Systems, Tianjin University of Technology, Tianjin 300384, China.

References

7