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
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
The lighter drive 更轻便的驾驶理念Electric cars made from carbon fibre will be safer and go farther 电瓶汽车+碳纤维材料=安全，耐用They look safe in thereMARK WEBBER has a lot to thank tiny strands of carbon When his Formula 1 car cartwheeled in a spectacular 306kph (190mph) crash at the recent Valencia Grand Prix， what helped him to escape unscathed was the immensely strong carbon-fibre “tub” that racing drivers now sit Carbon fibre is an expensive alternative to making things in steel or aluminium， but besides being extremely strong it is also very It is found in high-performance parts， like aircraft wings， bits of supercars and the frames of pricey mountain But if work by Germany’s BMW proves successful， it could also become the material of choice to mass-produce electric 6月，F1瓦伦西亚大奖赛发生了惊人一幕：以每小时306公里（190英里）行驶在赛道上的马克�6�1韦伯发生了严重的翻车事故。奇迹的是，韦伯本人毫发无 伤。奥妙之处就在于当下流行于F1的——碳纤维底座。虽然与铁，铝相比，它的造价较高，但是抗压及轻便性都远远好于铁和铝。目前，炭纤维材料还大多使用在 高精度领域，如飞机机翼，F1赛车，或是私人山地车等。不过这一传统观念可能会被宝马公司打破，一旦试验成功，那么碳纤维就可以率先广泛应用在电动汽车领 域。The Bavarian carmaker plans to launch a new plug-in electric car in It will be one of the first designed from scratch to use an electric motor rather than being converted from an existing Reducing the weight of this four-seater car， known as the Megacity concept， will be crucial to improving its performance and So BMW is planning to use no steel at The Megacity will be built as two modules: an aluminium chassis will contain the electric drive-system and battery， and a body made almost entirely of carbon fibre will be fitted onto 德国汽车制造商正计划将在2013年推出一款电瓶可拆卸式环保车。这并不是从现有车型改装而来，而是设计师卧薪尝胆的一次全新尝试。更轻便的4人坐驾，完 全符合现代城市环保理念，这款“无铁”车型的设计，彰显出了它的与众不同与理念上的更新换代。但是这样一个设想目前还处在起步阶段，或许成功的那天，汽车 铝制底盘上充电驾驶装置与设备，及全身碳纤维的设计工艺，能够更好的诠释大城市的环保概念。Carbon fibre is 30% lighter than aluminium and 50% lighter than The fibres are extremely tear- When woven into a lattice structure and impregnated with resin they can produce a part that is stronger than The trouble is the process is labour-intensive and slow， not least because components may have to be cured for hours under pressure in massive ovens called For carmakers， used to stamping out steel body-parts in a few seconds， this has ruled out carbon fibre for high-volume BMW， however， aims to change 碳纤维比铝轻便30%，是铁的50%。同时，由于纤维具有极强的抗断裂性，再融入树脂形成晶体结构后，那么它的强度就要超过铁。但是这道工序属于劳动密集 型，效率相对较低，以前车用铁制品的切割仅需要几秒钟时间就能完成，而现在则需要在高压炉内高温锻造几个小时，因此，大量生产碳纤维的可能性不高。不过， 宝马公司目前也正在试图改变这一情况。Its production line starts with a so-called precursor: a fibre spun from a This is carbonised by heating it in multiple stages to leave individual carbon fibres just seven microns (007 millimetres) Around 50，000 of these fibres are bundled together into a yarn which is then made into a This can be cut and handled like a Strips of fabric are then overlaid to align their fibres in such a way to maximise their load-bearing characteristics as required—in effect tailoring components like a bespoke 现在，宝马生产线守开先河，将聚合体加工成纤维状，这个碳化过程需要在高温下进行几道工序，最后产生的碳纤维厚度只有7微米（007毫米）。然后，大 概将5000根这样的纤维拧成一股就成了纤维织物，再将这样的纤维根据它的陌生能力将它切割成最合适的尺寸，实际上，这个步骤与量体裁衣有异曲同工之妙。Along come the robots 自动机将助一臂之力BMW uses molds， heat and pressure to produce contours in the Resin is then injected into the molds to bond the fibres How the resin flows through the fibres is crucial; it has to be done quickly and leave no area untreated before it starts to A release agent in the resin migrates to the surface to prevent the component sticking in the The whole process， which can be handled by robots， is completed in 然后，再利用模具与高温将纤维织物打造成型。首先，将树脂注入模具粘合纤维，这里有两个细节非常关键，一是动作要快不能拖泥带水，二是在没有粘合之前确保 模具内的树脂流向均匀。树脂中混有的隔离剂此时发挥功效，避免了纤维与模具发生粘连。整道工序，在自动仪器的协助下，仅需几分钟便可完成。The resulting carbon-fibre parts are bonded together to construct the body of the Besides their lightness， BMW’s experimental vehicles have exceeded expectations in crash tests， says the During front- and rear-impact-tests the aluminium chassis crumples to absorb energy， but leaves the rigid carbon-fibre passenger compartment Even extreme side-impacts protected the crash dummies and the battery (automatically switched off when the airbags trigger) In many cases crash damage is reparable by cutting out broken sections of carbon fibre and bonding in new 此时的碳纤维就可以应用于汽车制造。宝马公司声称：除了超轻便的特性之外，碳纤维的抗挤压能力也令人惊叹。在对车头车尾抗冲击测试中发现，一方面是铝制底 盘受到挤压而变形，缓冲了部分能量，而坚硬的碳纤维能够保证车身安然无恙。即使是侧面来的强力冲击，也能够有效保护车厢内假人模型及电瓶毫发无伤（当然， 气囊装置启动电瓶能够自动断电）。即便是车身有所受损，也不用担心，切割掉受损部分再粘合上新部件，完全可以让车体恢复原状。At some point， however， carbon-fibre cars will be Steel and aluminium is easy to recycle， but carbon fibre is Carmakers are working with aerospace firms on ways to do BMW has pioneered a process to reuse offcuts by breaking them up with heat to turn them back into raw This can be used to make composites with about half the strength of new carbon 铝的回收再利用技术已经非常成熟，但是从某角度来说，碳纤维这方面的技术还有待研究。目前，制造商正和宇宙空间机构合作，试图填补这一空白。眼下，处理碳 纤维“边脚料”最先进的方法还是来自宝马公司，他们通过高温分解，能够使之退回成未加工状态。通过此种方法生产出的复合材料也具有碳纤维一半的硬度。Another advantage of a carbon-fibre body is that it will not So， apart from the battery wearing out in ten years or so， electric cars could last for decades (electric motors need little servicing) This will make it even harder for car designers to persuade those driving electrically to trade in their rustless， tough-as-old-boots vehicles for a new 碳纤维的另一优势在于不易腐蚀，如果不考虑电瓶10年左右的使用寿命，这种碳纤维电瓶汽车可以使用长达几十年（当然马达还是需要检修的）。与结实耐穿的靴 子让人不忍丢弃一样，当设计理念再有突飞猛进的发展时，如何让使用者放弃碳纤维电瓶汽车，设计者可要好好动一番脑筋喽。英文附带汉语拼音，希望对你有所帮助。
