Society into the information network era， the requirements of the vehicle no longer be satisfied with a means of transport， but also want to live and work car is an extension of the scope， in the car like in their own office and home work and At the same time， the growing automotive electronics and also the rapid development of automotive technology was considered in the development process of a revolution of automotive electronics is a measure of the degree is seen as an important level of Hyundai Motor With computer technology， communication technology， the rapid development of integrated circuit technology in order to figure represented Fieldbus field instrument， equipment， a large number of applications， red tape has been the scene of a single simple connection of fieldbus networks in place of， the quality of signal transmission also greatly improved， cars have begun to enter the Internet A In the last decade， the users of motor vehicles for the comfort， safety and environmental requirements such as performance In order to meet these ever-increasing demand for computer-controlled vehicle electrical and electronic equipment increased dramatically， making vehicles (especially cars) the design of the layout of electrical circuits has become increasingly In addition， a variety of automotive electrical and electronic connector of the ensuing surge in the number of motor vehicles traveling on the course because of the failure point connector automotive electrical and electronic equipment on the issue of failure to perform its functions more and more To address these problems， many new models (especially the high-end models) the beginning of the development of the wider use of computer network In this paper， computer network technology in the automotive application of the basic principles of network technology on the inside and outside the vehicle， the introduction of the internal network， introduced the characteristics of automotive and automotive standards for the internal network， focuses on the control of the main local area network CAN characteristics and their Vehicle performance in accordance with the role of the impact of division of motor vehicle electronic products can be summarized as two types: one is the automotive electronic control devices， including the engine， chassis and body electronic One is car-car electronic devices， including motor vehicle information systems， navigation systems， car audio and video entertainment systems， automotive communications systems， Internet
PVA film is widely used as a kind of water soluble polymer material， transparent and has good toughness， resistance and excellent performance of the sweet， is a kind of green packaging material is very promising， but due to the PVA molecule contains a large number of hydroxyl， hydroxyl form easily with water molecules in the hydrogen bond， lead to water resistance is poor， limits the application This paper analyzes the shortcoming of water resistance of PVA research results， using urea and boric acid to improve the water resistance of polyvinyl alcohol modifier， experiments are used in modification of polyvinyl alcohol with different amount of urea and boric acid， by the measurement of thin film dissolution rate and swelling ratio， urea and boric acid water the best of the blend film dosage were determined， and then through the method of comparison analysis of the modification effect of urea and boric acid on the polyvinyl alcohol， the urea on the modification effect is better than that of boric acid polyvinyl alcohol film water resistance of urea modified theory， water resistance of PVA film and mechanical properties of Modified PVA boric acid water film test， analysis of test results， the amount of the modifier modified film mechanical properties (tensile strength， elongation at break， tear strength)
Electronic brakeforce distribution or EBD or EBFD is an automobile brake technology that automatically varies the amount of force applied to each of a vehicle's brakes， based on road conditions， speed， loading， Always coupled with anti-lock braking systems， EBD can apply more or less braking pressure to each wheel in order to maximize stopping power whilst maintaining vehicular [1][2] Typically， the front end carries the most weight and EBD distributes less braking pressure to the rear brakes so the rear brakes do not lock up and cause a [3]How ABS worksUnder heavy braking， vehicle wheels may lock- The anti-lock braking system (ABS) monitors wheel speeds and releases pressure on individual wheel brake lines， rapidly pulsing individual brakes to prevent lock- During heavy braking， preventing wheel lock-up helps the driver maintain steering Modern ABS has four individual brake lines for each wheel， enabling different braking pressure on different road For example， less braking pressure is needed to lock a wheel on ice than a wheel which on bare If the left wheels are on asphalt and the right wheels are on ice， during an emergency stop， ABS detects the right wheels about to lock and reduces braking force on the right wheels， helping to avoid lock-up and loss of vehicle How EBD worksAs per SAE technical paper #920646 - Buschmann et "The job of the EBD as a subsystem of the ABS system is to control the effective adhesion utilization by the rear The pressure of the rear wheels is approximated to the ideal brake force distribution in a partial braking To do so， the conventional brake design is modified in the direction of rear axle overbraking， and the components of the ABS are EBD reduces the strain on the hydraulic brake force proportioning valve in the EBD optimizes the brake design with regard to: adhesion utilization; driving stability; wear; temperature stress; and pedal "EBD may work in conjunction with ABS and Electronic Stability Control ("ESC") to minimize yaw accelerations during ESC compares steering wheel angle to vehicle turning rate using a yaw rate "Yaw" is the vehicle's rotation around its vertical center of gravity (turning left or right) If the yaw sensor detects more/less yaw than the steering wheel angle should create， the car is understeering or oversteering and ESC activates one of the front or rear brakes to rotate the car back into its intended For example， if a car is making a left turn and begins to understeer (the car plows forward to the outside of the turn) ESC activates the left rear brake， which will help turn the car The sensors are so sensitive， and the actuation is so quick that the system may correct direction before the driver ABS helps prevent wheel lock-up and EBD helps apply appropriate brake force to make ESC work
Mold is a specific form of the structure of certain way so that materials for the products forming a tool products， industrial production is based on technology equipment， parts of its production by the performance of high precision and high complexity and high consistency， high efficiency and low production Energy supplies， growing levels of government and industry attention to the national economy， especially light industry， electronics， machinery， communications， transport， automotive， military and other departments， if not it will be difficult to mold the production and development of products if they can not The timely supply of mold， will affect the development of the production;If the mold is low precision products of poor quality; die if short life， low productivity and high Western industrialized countries will die likened to "the point Tiecheng，" the "magnetic Industry，" "golden key" and "metal processing Emperor" and "the momentum into the affluent " In our country to die as "the mother of industry，" and "an unmatched efficiency "When the current period of rapid development of China's economy， the Plastics Industry has also been an unprecedented development， plastic mold is also increasingly showing its industrial production in the foundation， but on the plastic mold by high-speed development， because of its inherent weaknesses of reasons， As well as advanced foreign technology and the competitiveness of high-quality products， plastic mold is also faced with unprecedented In such form， the Chinese enterprises should not only speed up the modeling industry cluster， a scale， but also pay attention to mold the front of the industrial chain development， personnel development and industrial chain back-end testing and information services， as soon as possible to shorten technology， management， Equipment levels and the gap between international This is the plastic mold in the development of enterprises need to address the important
