中英文文献翻译—汽车ABS技术及其发展趋势Word格式.docx

1、#附录#附录 A. #Car ABS Technology and Development Trend#In the car before the emergence of abs, used car is the open loop brake system. Its characteristicis the brake torque only and drivers of the size of the manipulation of the force, braking force distribution regulation and the size of the brakes on

2、 and type. With no wheel the motion of feedback signal measurement, can#t know during wheel brake speed and holding in death, car you may adjust accordingly wheel cylinder or the gas chamber of the size of the brake pressure. So in an emergency brake, inevitably appear wheel on the ground, holding i

3、n death dragged the phenomenon of sliding.#When the wheel lock, the ground of the performance was poor, the lateral attached can provide the lateral adhesion is small, car by external force in any minute under the action of will appear direction, easily happened instability problems of traffic accid

4、ents. In the wet pavement or snow and ice on the road, the direction of brake the instability of the phenomenon can more serious. towing It is through the basic function of sensors# wheel each transient state of motion, and according to the motion correspondingly adjust the size of the brake torque

5、in to avoid the wheels holding in death, it is a phenomenon of closed-loop brake system.#It is the electronic control technology in cars of the most successful application project, one of auto brake antilock brake systems can make the car in the braking maintain stability and shorten the direction b

6、raking distance, effectively improve the driving safety.#Car ABS can say is the most important car safety history of the three great inventions （the other two are airbag with seat belt）,#ABS is also other safety device （such as ESP driving dynamic stability system and EBD braking forces based distri

7、bution system） Because money spent too big, ABS the practical use of the early railway vehicle or aircraft. 70 s, digital electronic technology and large scale integrated circuit, for the rapid development of ABS system lays a foundation to practical application. Bosch company in 1978 first launched

8、 the digital electronic control unit of the brake system, and ABS2 Bosch holding device inthe Mercedes Benz, which opened on the modern ABS system development sequence#Although the Bosch ABS2 of electronic control device is a separation of the components, but due to the digital electronic control de

9、vice and analog electronic control device, the reaction speed, compared to the control accuracy and reliability are significantly improved, therefore, Bosch ABS2 control effect already is quite good. From then on, Europe, America and Japan, many professional company and brake car companies have deve

10、loped a variety of ABS system. According to statistics, the whole world has more than 60% of new cars equipped with ABS device.#When the car brake wheel speed and the differences between body speed, can lead to the wheel and the road, when the wheel slippage between produce pure rolling way and the

11、pavement at contact, the slip rate is zero, and wheel lock the slip rate is 100%. When the slip rate between 10% 30%, the largest transfer of power. The basic principle of braking antilock brake system （2, 3 is based on the above research, through the control regulation system in power, braking proc

12、ess, to the wheel in the slip rate control, within the scope of the right to obtain the best braking effect. ABS system hardware mainly by the wheel sensor, electronic control devices, brake pressure regulator three major components, constitute a to the slip rate is the control of the target of the

13、closed-loop control system. The wheel speed sensor and the data transfer to the electronic control device. Control device is a microprocessor, according to the wheel speed sensor signal to calculate the speed of the car. In the braking process, reducing speed and control device of programmed ideal r

14、educing the speed of characteristic curve in comparison. If control device judge the wheel reducing speed too large and the wheel will embrace died, signal to hydraulic regulator, hydraulic regulator is according to the control device of the signal to the brake wheel cylinder of hydraulic control （t

15、he boost, the pressure or blood pressure）. Brake pressure to adjust the frequency of the cycle up to 6 20 H z. ABS technology at the core of theproblem is the control algorithm of research. The control car ABS is a complex, essential nonlinear control problem. In recentyears, domestic and foreign sc

16、holars in the control of ABS calculate#Method on the many theoretical research, mainly in the following several control#methods. Now automotive ABS system most of the products are the addition, subtraction speed control, and additional threshold some auxiliary threshold, not involve specific mathematical model. Threshold control for nonlinear systems is an effective control method. In the braking process, can be a primary angular velocity threshold, when actual#a