Who has a dynamic paper on the development of new automobile technology? It's only about 1500 words, and it needs the latest one.

Second, the characteristics of automobile development

Burns, vice president in charge of R&D and planning of General Motors, said: "The future car will have the following seven characteristics: safety, low price, environmental protection, practicality, high efficiency, saving time and providing contact with the outside world. This means that the automotive industry must innovate around low prices, practicality, design and technology. " Nowadays, in this network-driven era, digital applications are being integrated at an unprecedented speed and way, integrating automobile design, engineering, procurement and manufacturing, which enables us to shorten the development time of automobiles and bring new cars to market at a faster speed. The most important thing is the following two aspects:

One is car design. With the use of more and more computer tools, more styles and models can be developed in a shorter time. With the use of more and more mathematical models, the simulation design can be verified, and the aerodynamics, crashworthiness and manufacturability of automobiles can be confirmed, which greatly shortens the development time. At the same time, more and more automobile manufacturers adopt the concept of virtual automobile, so that they can assemble, observe and simulate the performance and manufacturing process of automobiles without making physical prototypes. More and more strategic partnerships among manufacturers, research institutes, governments and suppliers further accelerate the development time of automobiles.

As the lifestyle of consumers dominates the trend of automobile design, a new type of automobile will be born, thus meeting the requirements of 1.

Graduation thesis of new automobile technology-new automobile technology and its future development trend

More and more demands from consumers. 【】 These new products will combine the characteristics of cars, station wagons, pickup trucks and off-road vehicles to varying degrees, and will also promote the further differentiation of the automobile market.

The second is in terms of automobile power. Experts predict that in the future 10 years, the internal combustion engine will still be the main source of automobile power. However, the main development direction of automobile power system in the future is to adopt lean-burn gasoline engine and diesel engine technology more and more, optimize fuel engine combination and better catalytic technology.

The configuration of automobile power system will change. Various power technologies, such as electric and fuel hybrid vehicles and fuel cell vehicles, will become more and more popular. These cutting-edge technologies are expected to reduce or eliminate automobile exhaust emissions and their environmental pollution in the future.

In addition, in the future, automobiles and mechanical systems will be largely replaced by electronic systems. This will greatly improve the driving performance and driving safety of the car. Its features include: language recognition, keyless ignition, etc.

It can be said that a prominent feature of the new generation of cars is that there will be more electronic equipment, computer functions and internet access functions. The car is equipped with: traffic information function, route planning and navigation equipment, advanced navigation equipment, vehicle entertainment information equipment, etc. Therefore, the automobile will become an information, communication and entertainment center, which can exchange information with consumers' homes and offices. In terms of automobile safety: In order to protect the safety of drivers and passengers in the car, automobile manufacturers will install a new generation of seat belts, energy absorption structures, front and side airbags, intelligent sensors that trigger airbags, and distress signals in emergencies.

Thirdly, vehicle dynamics control.

The abbreviation of Vehicle Dynamics Cotrol is VDC, and the function of this system is to keep the stability of the car during driving (including braking and driving). Traditional ABS (Anti-lock Braking System) and TCS (Traction Control System) mainly control the braking force and driving force on the wheel to prevent the longitudinal slip rate of the wheel from being too large, so as to obtain the maximum adhesion, which can not only produce the maximum deceleration (acceleration), but also prevent side slip.

Although the vehicle dynamics control system also controls the braking force and driving force of the wheels, they are very different from ABS/TCS. Its main performance is that it can realize the differential control of the left and right longitudinal forces, thus directly providing the vehicle with the yaw moment to offset the unstable movement of the vehicle (such as the correction function when the vehicle swings its tail on the wet road). The system detects the vehicle motion posture such as speed, angular velocity and steering wheel angle through various sensors installed on the vehicle, actively brakes one wheel as needed, changes the vehicle motion state, enables the vehicle to achieve the best driving state and handling performance, and increases the adhesion of the wheels and the handling stability of the vehicle.

The function of automobile intelligent speed control system is to impose mandatory restrictions on vehicle speed on some special road sections or under special driving conditions. Automobile intelligent speed control system is mainly composed of electronic control unit and actuator. Control system work 2

Graduation thesis of new automobile technology-new automobile technology and its future development trend

When working, you need to set the speed limit first. [] For example, if the speed limit in a certain area is 80km/h, we can set the speed as the speed limit value. When the vehicle speed does not reach 80km/h, the automobile intelligent speed control system does not work. When the vehicle speed approaches 80km/h, the ECU starts the actuator to limit the travel of the accelerator pedal, so that the vehicle cannot continue to accelerate. When the vehicle speed is lower than 80km/h, the ECU releases the control of the actuator, and the driver can freely step on the accelerator pedal to accelerate the vehicle.

The speed limit value of intelligent speed control system can be set by selecting switch or receiving wireless signal (i.e. wireless signal for switching road speed or switching electronic map signal): only one value can be set, and multiple gears can be set according to different road conditions.

Fourthly, control by wire.

Various automobile control systems are developing towards electronization and automation. In the next 5 ~ 10 years, the traditional automobile mechanical control system will become an electrical system connected with high-performance CPU through high-speed fault-tolerant communication bus. For example, automobiles will use motors and electric control signals to realize steering by wire, braking by wire, throttle by wire, suspension by wire and so on. Using these drive-by-wire systems will completely replace the hydraulic and mechanical controls in the existing systems.

This new technology is adopted by DBW in the new generation Accord V6 car. DBW is the abbreviation of throttle by wire, which can also be called electronic throttle, that is, the throttle of the engine is electronically controlled. The traditional throttle control method is that the driver directly controls the opening and closing degree of the engine throttle by stepping on the accelerator pedal, thus determining acceleration or deceleration. The driver's action and the accelerator's action are linked by the mechanical action of the cable. DBW turns this mechanical connection into an electronic connection. The driver still controls the cable by stepping on the accelerator pedal. However, the cable is not directly connected to the accelerator, but to the accelerator pedal position sensor. The sensor converts the position change of the cable into an electrical signal and transmits it to the ECU (electronic controller) of the car. After processing the collected sensor signals, the electronic control unit sends a command to the throttle actuator control module, and then the throttle actuator control module sends a signal to the throttle actuator to control the throttle opening and closing. That is to say, the driver's action and the accelerator's action are linked by the electrical signals of electronic components. Although the structure of DBW is more complicated than the traditional throttle control method, the throttle control is more accurate than the traditional method. The engine can accurately adjust the air-fuel mixture entering the cylinder according to various driving information of the automobile, and improve the combustion condition of the engine, thus greatly improving the power and economy of the automobile.

There are many advantages to using the wire-controlled technology, such as using wire-controlled braking without brake fluid, protecting the ecology and reducing maintenance; Light weight; High performance (fast braking response); Minimum brake wear (more uniform force on the tire); Installation and testing are simpler and faster (modular structure); More stable electronic interface; There is no mechanical connection between the partitions; A simple arrangement can increase the electronic control work 3.

Graduation thesis of new automobile technology-new automobile technology and its future development trend

Yes; The pedal features are consistent; Less components than hydraulic system, etc. []

Because there is no communication network that CAN meet all the cost and performance requirements of future automobiles, automobile main engine plants will still adopt various networking protocols (including CAN, LIN and MOST, 1394, etc.). ).

With more and more applications of electronic control units in automobiles, data communication between on-board electronic devices becomes more and more important, so it is necessary to build an on-board electronic network system based on distributed control system. The rapid exchange, high reliability and cheapness of a large amount of data are the requirements for the automotive electronic network system. In this network system, each processor runs independently, controlling and improving the performance of a certain aspect of the car, and providing data services when other processors need it. The composition of automobile internal network mainly depends on bus transmission technology.

Automobile bus transmission is to connect all kinds of electronic control units, intelligent sensors and intelligent instruments in the automobile through certain communication protocols, thus forming the automobile internal network. Its advantages are:

1. reduces the number and volume of wire harness, and improves the reliability and maintainability of electronic system.

2. Universal sensors are adopted to achieve the purpose of data sharing.

3. The flexibility of the system is improved, that is, the change of the system function can be realized by the software of the system.

CAN bus is a serial data communication protocol developed by Bosch Company in Germany in the early 1980s. Its short frame data structure, lossless bus arbitration technology and flexible communication mode make CAN bus have high reliability and anti-interference, which meets the requirements of real-time and reliability of automobiles.

At present, foreign automobile bus technology is very mature and has been popularized and applied in automobiles. Since 2000, Audi A 6 cars produced with imported technology in China began to use bus to replace the original wiring harness, and Passat B5, Bora, Polo, Fiat's Palio, Siena and Hafei racing cars all used CAN bus technology to varying degrees. In addition, some high-end passenger cars and construction machinery have also begun to apply bus technology. It is estimated that by 2005, CAN will occupy 63% of the whole automobile network protocol market. In Europe, the network based on CAN also occupies about 88% of the market.

At present, most cars using CAN bus network have two or more buses. One is power CAN bus, which mainly includes three nodes: engine, ABS and automatic transmission, and the communication rate is generally 500kbps. The other is a comfortable CAN bus, which mainly includes a central controller and four door modules. The communication rate is generally 62.55kbps or 100kbps.

Five, electronic cruise control system (CCS)

In order to achieve the desired speed, the driver does not need to step on the accelerator to adjust the speed, but only needs to operate the adjustment switch, and the car can travel at a fixed speed. Main advantages of this equipment 4

Graduation thesis of new automobile technology-new automobile technology and its future development trend

It should be reflected in: when driving on expressway for a long time, it can reduce the fatigue of drivers; In addition, the reliability of emergency action release and the safety of troubleshooting equipment are fully considered. []

The engines used in BMW's new generation luxury cars 745i and 735i are brand-new V8 engines with adjustable intake system parameters. The three main parameters of the engine intake and exhaust system (exhaust valve opening time, intake valve lift and intake port length) can be automatically adjusted with the change of engine working conditions. Among them, the technology of adjustable inlet length is the first in the world. Siemens provided the servo valve, the position sensor of the intermediate eccentric shaft and the valve lift controller connected with the engine microcomputer.

The unique dynamic control system of Mercedes-Benz SL car includes an electro-hydraulic braking system (EHB), which is called induction control system (SBC). The main feature of the system is to establish dynamic monitoring of motion state and braking pressure and early warning of dangerous working conditions through sensors. SBC has added the functions of pressure control and brake preparation of brake pipeline. Once you step on the brake pedal, the car will brake with the maximum pressure and the fastest response, and the ratio of front and rear braking pressures will change with different road conditions, thus improving the safety when braking in corners. Its advantage (also a technical difficulty) is that it improves braking comfort and can react in advance, instead of being controlled by signal feedback after braking like traditional ABS; In addition, complete dry braking can be realized, and no water film will be formed on the surface of the brake disc in humid climate or road conditions, thus ensuring the rapid response of the automobile.

The development of design will inevitably change with the progress of automobile technology, and the artistic styles of many designers will be more widely and strongly reflected in automobile design, giving people a wider range of choices. Under the high-tech, the car with distinctive personality and more humanization will be the inevitable development of the automobile industry in the 2 1 century, because it conforms to the pursuit and demand of human culture and personality. Therefore, increasing attention and investment in concept car design will greatly promote the development of China automobile industry.