Research on Efficiency Analysis of Automotive Electrical Mechanical

Brake

Kai Liu

1, a, *

, Jiani Song

1, b

Jilin Technology College of Electronic Information, Jilin 132021, China

Keywords: Automobile; Electromechanical brake; Efficiency.

Abstract: With the continuous development of science and information technology and the continuous development

and improvement of the national economy, remarkable technological progress has been made in the

technological development and application of electronic machinery and hydraulic brakes in the automotive

industry. To greatly improve the quality and efficiency of automotive electronic machinery and hydraulic

braking, strengthen the research and analysis of automotive electronic machinery and hydraulic braking, it

would be helpful to establish the mathematical model of automobile electronic machinery and hydraulic

braking system and the theoretical model of mechanical dynamics system. The effectiveness of mechanical

hydraulic braking is better than that of traditional automobile hydraulic mechanical braking, which provides

a solid basis for promoting the study of the effectiveness of electronic machinery and hydraulic braking and

the development of their application in the modern automobile industry. its effectiveness is analyzed

experimentally in this paper.

1 INTRODUCTION

With the rapid progress and development of the

automobile electronic braking industry, the

technology of vehicle electronic mechanical braking

is also rising. The electro-mechanical braking

technology for vehicles is an important technical

prerequisite for consumers to ensure vehicle driving

and traffic safety. The driving safety performance of

automobiles also makes automobile consumers have

higher and higher technical requirements for

automobile electro-mechanical brake anti-skid

systems. The exquisite braking system for the

performance of automotive electro-mechanical

braking, the technology of the automotive industry is

no longer limited to the traditional hydraulic

electromechanical brake. Therefore, professionals

have made many developments in advanced

automotive electro-mechanical braking technology as

well as electromechanical and hydraulic brakes. With

this more efficient technology, electronic machinery

and hydraulic brakes can better meet the requirements

of automobile consumers for driving and driving

safety, and make the automobile development

technology get better development and progress. The

performance of vehicle electromechanical brake has

always been an important technical key to vehicle

driving safety, and people have been paying great

attention to the maintenance and improvement of

the anti-skid performance of automobile

electromechanical brake. (He Ren, Hu Qingxun,

2005)

Automotive electronic machinery and hydraulic

braking to better meet the requirements of this

technology, so that the development of vehicle

braking technology is more rapid. In the 1990s, some

large international manufacturers and automobile

manufacturers of auto parts in Europe and America

began to study the EMB system, among which Bosch,

Siemens, and Tevez in mainland Germany conducted

in-depth research on the EMB system. Tevez in

mainland Germany and Darmstadt University of

Technology in Germany cooperated to discuss the

EMB braking model and control system model, and

the key technologies of the EMB system were studied

in many universities in China.

Liu, K. and Song, J.

Research on Efﬁciency Analysis of Automotive Electrical Mechanical Brake.

DOI: 10.5220/0010020500420045

In Proceedings of the International Symposium on Frontiers of Intelligent Transport System (FITS 2020), pages 42-45

ISBN: 978-989-758-465-7

2 BRIEF INTRODUCTION OF

AUTOMOBILE ELECTRO-

MECHANICAL BRAKE

When the vehicle is driving, the signal is transmitted

to the central control unit of the engine in real-time

through the current and displacement angular velocity

sensor in the electric brake pedal sensor. Through the

analysis of the schematic diagram of the optimal

braking force of the vehicle driver by the central

control, the pedal displacement information can be

analyzed, the optimal braking force for the target

vehicle can be calculated, and a control signal is sent

to the four simulators and EMB drivers respectively.

After the EMB brake regulator receives the signal

about the brake motor, the control signal is

transmitted to the engine. In order to automatically

control the current and angular speed of the engine

according to the signals and instructions sent by the

driver to the engine. At the same time, according to

the actual situation of driving vehicles, roads, braking

equipment and systems, the brake simulator in the

electronic brake pedal sensor sends back\ "road

sense\" to the vehicle driver in the following ways.

The sensor collects feedback information about the

current and speed of the brake motor and the

clamping force of the brake motor and sends it to four

EMB brake regulators to control the operation of the

whole engine. The process consists of a three-layer

closed control circuit and a simulator to ensure the

best braking speed and performance. (Xiong Jian, Hu

Yongping, 1995)

3 VEHICLE DYNAMIC

ANALYSIS MODEL

3.1 Carries on the Force Analysis to the

State of Vehicle Braking

When the electro-mechanical brake on the

automobile road is working on the road, the force

analysis of vehicle braking has always been a focus

of design and discussion in the theoretical model of

automobile electro-mechanical dynamics. When

designing and analyzing the braking force, it is

assumed that when driving at high speed on a

horizontal road, the main factors such as rolling

resistance, air resistance, tire deformation, and

vehicle suspension are ignored, and the consequences

are likely to be unimaginable. The force analysis of

the influence of direct high-speed driving on the

performance of the vehicle is carried out, including

the main contents of force analysis, including the

control of the quality of the vehicle, the braking force

of the front and rear of the vehicle, the prevention of

vehicle skidding and the increase of speed. the

wheelbase of the front wheel and the wheelbase of the

rear wheel. Then through the analysis of the quality

and force of the braking force, it can help to analyze

the braking effect of the vehicle. (Peng Xiaoyan, et.al,

2010)

3.2 Tire Force Analysis Model

In the dynamic vehicle model, the analysis of the tire

force model can effectively improve braking

performance. This paper analyzes the tire force model

in the EMB brake. When braking the vehicle, the tire

characteristics have a more important impact on-road

braking performance. The determination of the tire

force model is mainly related to tire radius, vehicle

braking torque, tire rotation angular velocity, and

ground adhesion coefficient. A suitable mathematical

model is used to analyze the braking force of the

vehicle tire. The braking force of different tires is also

different, and the results of force analysis of the same

car may also be different, which needs to be analyzed

many times to get accurate results.

3.3 Adhesion Coefficient

Wheel adhesion coefficient braking and shape

coefficient ground adhesion and shape coefficient

also play an important role in the complete breaking

of the vehicle. When the whole tire of the vehicle is

in the state of semi-complete rotation or semi-rolling,

the adhesion and shape coefficient of the ground

should be a value that can directly reach the

maximum, that is, the stability of the lateral braking

force of the vehicle is the maximum. at this time, the

lateral stability of the tire is good. At this time, if the

wheel is completely braking and locked without

rotation or rolling, the tire will be completely attached

to the whole ground, the lateral stability is almost

zero, and it is easy to slip and swing the tail of the

vehicle, which is easy to cause traffic accidents. The

calculation and determination of vehicle adhesion and

shape coefficient on expressways are of great

significance and influence for the establishment and

introduction of vehicle dynamic model. The brake

adhesion and shape coefficient of the whole vehicle

tire is mainly affected by the ratio of speed and brake

slip coefficient. The accuracy of the mathematical

model of the system can be determined by the

calculation of the maximum wheel adhesion

Research on Efﬁciency Analysis of Automotive Electrical Mechanical Brake

coefficient, the vehicle speed, the wheel brake slip

coefficient ratio, and the minimum wheel shape slip

coefficient. Also, according to the brake slip

coefficient ratio of different speed wheels, the

adhesion and shape coefficient of the road surface is

also adjusted, and the braking and road surface

adhesion coefficients under different dynamic

parameters are obtained.

3.4 Model of EMB Braking System

The electromechanical control connection between

the automobile brake hydraulic pedal and the

electronic hydraulic brake control device is

disconnected through the automobile brake

application line, and the control instructions of the

brake pedal are directly transmitted to the applied

wire harness on the electronic hydraulic brake pedal

through the radio signal. At present, the automobile

hydraulic braking device can be divided into two

hydraulic braking systems: the new electronic

hydraulic braking system (EHB) and the new electro-

mechanical hydraulic braking system (EMB). The

new type of electronic hydraulic brake (EHB) system

is an advanced technical product specially used for

electro-mechanical hydraulic brake (EMB). It is

further developed on the basis of inheriting the

existing traditional hydraulic electronically

controlled braking system, and the traditional

hydraulic electronically controlled braking system

has also been slightly improved and improved. At

present, it has been widely used in the international

market. However, the EHB braking system has many

inherent defects such as too many electronic

hydraulic braking lines, complex arrangement, and

installation, complex abs hydraulic electronically

controlled braking system, difficult production and

maintenance, and high cost. The hydraulic braking

system can not adapt to the development of the

automobile. With the development of torque drive

technology and electronic control technology, EMB

will become the main market of the automobile

braking system. (Li Dinggen, et.al, 2012)

3.5 Motor Model

When studying the braking performance of the

automobile, selecting the appropriate engine model

can make the automobile output stable electric power.

In the EMB braking model, the armature current

under the model can be obtained by determining the

mathematical model of armature feedback EMF,

engine induced EMF, and armature loop inductance.

Also, according to the EMB braking model, the

simulation device of engine output torque can be

determined by adding factors such as armature loop

inductance to simulate engine output torque.

3.6 Planetary Gear

The planetary reducer is the most important part of

the EMB braking model. The most important purpose

of the reducer is to reduce the speed and increase the

induced torque of the transmission to meet the

requirements of the vehicle braking state, including

the planetary deceleration model of the reducer,

which includes the relationship between the input

torque and output torque. the output torque of the

planet can be obtained by determining the

mathematical relationship between the input torque of

the solar gear and the rotation efficiency of the

planetary gear.

3.7 Model of Ball Screw Pair

In the EMB braking model, the main function of the

double ball screw model is to change the direction of

motion. In the screw group, the rotation input of the

planetary device is converted into screw translation

and then transferred to the brake block; in the twin-

screw model, the rotation torque of the ball screw is

read from the outlet torque of the planetary frame, and

then the third rotation torque of the torque is

transmitted by reading the ball screw pair. Also by

expressing friction, momentum, and other system

relationships. (Peng Xiaoyan, 2013)

4 SIMULATION OF VEHICLE

BRAKING PERFORMANCE

4.1 Parking Braking Control

Algorithm

The parking brake control algorithm of the system is

mainly applied to collect the switch activation signal

for parking brake sent by the system, the

displacement switch activation signal of the brake

pedal, and the displacement signal of the parking

brake pedal. As the basic basis and condition for

judging and evaluating the state of parking and

exiting parking braking, the braking of parking and

parking is completed. That is, according to the

response of the manual parking button to the signal of

the parking switch, the state of parking and parking

exit, an important result of judgment is that the

system has completed the actual parking braking

FITS 2020 - International Symposium on Frontiers of Intelligent Transport System

control algorithm. such as manual parking, automatic

parking, and auxiliary control. (Song Jian, et.al, 2006)

4.2 Simulation Model of the

Electro-mechanical Braking System

When studying the performance of the compact

automobile electromechanical braking system, the

electronic simulation braking model of the compact

electronic simulation braking system is established.

The EMB electronic simulation braking model

system is simulated by using smurf and other

electronic simulation software, and the relevant

electronic simulation braking data of the braking

system are obtained. Compared with other traditional

hydraulic electronic simulation braking system

models, the simulation performance of this simulation

braking model is better to obtain the authenticity of

effective braking data, which shows that the

simulated braking model of electromechanical

simulation braking system can have better simulation

effect of the electronic braking system.

5 CONCLUSION

In the process of the continuous and rapid

development of our society and economy, people and

consumers have an increasing understanding and

demand for and improving the driving safety of cars.

To continuously improve the performance of braking,

in the design and analysis of the efficiency of

automobile hydraulic and electronic braking systems,

the performance and efficiency of the automobile

electronic braking system are simulated and

simulated. to better realize the comparison of braking

and hydraulic performance between automobile

electro-mechanical hydraulic brake and traditional

electro-mechanical hydraulic brake, we can know

through the comparative analysis of braking and

hydraulic performance. The duration of hydraulic

braking of electro-mechanical braking is shorter than

that of traditional hydraulic braking so that better

electronic braking performance can be obtained in the

driving of electric vehicles.

REFERENCES

He Ren, Hu Qingxun. Braking process of the bus with

braking energy regeneration system [J]. Journal of

Jiangsu University: natural Science Edition, 2005 focus

26 (5): 390392.

Li Dinggen, Zhang Luyuan, he Baohua. Fuzzy control of

automobile electro-mechanical braking system based

on slip rate [J]. Journal of Mechanical Engineering,

2012 .48 (20): 121-126.

Peng Xiaoyan, Chen Changrong, Zhang Jing. Research on

sliding mode control of electro-mechanical braking

system [J]. Journal of Hunan University: natural

Science Edition, 2010 Journal 37 (8): 35-Qing.

Peng Xiaoyan. Research on Safety Control Technology of

Automobile on-line Brake system [D]. Changsha:

Hunan University, 2013.

Song Jian, Wang Huiyi, Liu Gang connecting rod electro-

mechanical brake (EMB) device: CN,1757947A [P].

2006-0412.

Xiong Jian, Hu Yongping's computer simulation of

automobile braking process [J]. Journal of Yunnan

University of Technology, 1995 11 (1): 33-Qing.

Research on Efﬁciency Analysis of Automotive Electrical Mechanical Brake