汽车ABS未来发展 方向.doc

The future direction of automotive ABSThe future direction of automotive ABSAutomobile anti-lock braking system (ABS) is to improve the performance of automotive brake important way, it can give full play to the potential tire and road adhesion, the maximum braking to improve vehicle performance to meet the traffic safety needs, it has been one goal. While the ABS is well established theoretical basis, but given the level of related industries such as electronics technology limited to reliability, price-benefit ratio as ABS two major obstacles on the path of development. 80 years since the 20th century, the development of electronic technology, ABS to improve the reliability, combined with increased vehicle speed, resulting in brake drag when the wheels are blocked traffic safety slip into one of the major risks, in order to improve the braking performance, security traffic safety, promote the increasingly widespread use of ABS. ABS system technology escalation ABS system involves the following aspects: one is the sensor. Traditionally, ABS sensor to sensor-based electromagnetic induction, 90% of the domestic market is the sensor-based, pneumatic ABS almost 100% using this sensor. This sensor has the advantage of low cost, resistance to harsh environment capability, but the drawback is the work space requirements of smaller, often no signal at low speed. In recent years the development of semiconductor technology, Hall sensors in the hydraulic ABS system gradually adopted, it is characterized by small size, large work space, independent of signal amplitude and speed, and direction of the gap can also be tested, particularly for ABS upgrade the products, so the Hall sensors show gradually increasing trend. Second the ABS controller. ABS controller is present mainly in the 16-bit microcontroller-based, generally use the dual-CPU, there is also a single CPU. They use a variety of hardware chip the large foreign semiconductor manufacturers have a mature solution, so hardware implementation is relatively simple. ECU main aspects of the hardware is the direction towards the integration, some companies try to use the advanced semiconductor technology with the power drive chip integrated CPU will be a variety of auxiliary functions such as power, communications are integrated together. This chip can be integrated into one or two devices, greatly improving the reliability of the system. On the software side was also trying to standardize ABS software, software development towards the graphical and automatic code generation direction, it will lead to demands for higher computing speed and larger CPU memory and program memory space. ABS uses CAN as the main communication bus Vehicle network are A, B, C three levels, A-level electronics based mainly on their own, their representatives bus is LIN. C-level real-time control is mainly represented by the bus is CAN. ABS uses CAN as the main communication bus, pneumatic ABS mainly SAEJ1939 as the network protocol, and the manufacturers of hydraulic ABS are generally set for themselves. General ABS communication rate of 500 baud ABS is a safety system, so the general state of it to ABS, wheel speed and other information sent to the bus. ASR system with a bus driver but also through the control. With the electric breaking (Brake-by-wire) the development requires the bus speed and reliability have greatly improved. Currently there 1M to 10M baud rate baud rate of bus, they are: TTP / C, TTCAN, Flex Ray, each bus has its own characteristics. There is no one bus into the practical stage, price and system fault tolerance is a major problem. In addition, Brake-by-wire system has not yet entered the stage of high-volume use, so the emergence of such high-speed bus will take time. Another part of the network is a vehicle diagnostic protocols, generally use ISO9141 as the earlier hardware standards, application layer protocol by the manufacturers custom. ISO9141 is a continuation of current trends in the hardware interface, the application layer protocol is used ISOKW2000. Electronic brake will be the development direction ABS in the early 20th century, 90 had mature, there is no breakthrough in the development over the past decade, but the expansion of technology in the ABS, the ABS gave the connotation of great improvement. The initial expansion of ABS anti-skid control system is, it is divided into Zhidong slip (EDS) and drive slip (TCS) in two parts, sometimes referred to as ASR. On this basis, extends the rear axle braking force load sensing control, the EBD functions, and electronic power brake EBA, these extensions are still mainly based on ABS. The mid-90s, ABS has entered a new development, ABS only as a subsystem of the new system, not a major system, but it still regards as an important part of the ABS. Pneumatic ABS evolved EBS, the electronic braking system, developed on this basis, stability control system, ESP, stability c。