CAR-A correct understanding of ABS

Before consumers buy cars, both have ABS (Anti-lock Braking System) as an important indicator. Along with technological development, at present, most of China's car has ABS as standard equipment. But for ABS understanding of the proper use and how many drivers is not very clear, even on ABS there have been some misunderstandings. Some drivers think that ABS braking distance is shortened devices, equipment ABS any road vehicles in the braking distance certainly not equipped than the ABS braking distance to short, or even that it was wrong on the road in the snow with the braking distance on the asphalt pavement in the braking distance is; Some drivers if equipped with ABS that, even in the rain or snow high-speed traffic on the roads, there will be no loss of control phenomenon. The current series of safe driving theme is correct understanding and use of ABS. ABS is not, as some people might think, greatly improve the physical properties of the limit. Strictly speaking, the main function of ABS in the physical limits of performance, ensure that brake when the vehicle itself maneuverability and stability. Application ABS ABS (Anti-lock Brake System) that is, "Anti-lock braking system," to maintain effective control of wheel rotation in the state and improve the stability of vehicle braking, poor road conditions and vehicle braking performance. Through the installation of the ABS wheel or in the drive shaft speed sensor continuously measured wheel speed, calculated by the computer then wheel slip ratio and the slip ratio and ideal compared to the increase or decrease Brake pressure decisions, orders implementing agencies promptly adjust brake pressure to maintain in the ideal state of the wheel brake. ABS first time in 1906, was awarded the patent in 1936 Bosch registered a motor vehicle wheels Locking prevent the "machinery" patent. Early designs all have the same problem: too complicated and vulnerable due to lead to failure, and that they operate too slowly. In 1947 the world's first set of ABS systems used on the B-47 bombers. Teldix company in 1964 started to study this project, the Bosch ABS study soon to take over all. Within two years, the first batch of test vehicles have ABS braking distance shortened with the function. Turning to the vehicles and stability were also assured, but the application was about 1,000 analog devices and safety switches, which means that a system known as the ABS electronic control unit reliability and durability of mass production is inadequate to satisfy the requirements needed to be improved. Bosch in the electronic engine management process of the development of the technology, digital technology and integrated circuits (ICs) to the advent of electronic components to reduce the number of 140. 1968 ABS started to look for the car. Since 1975 the United States Federal Motor Vehicle Safety Standard 121, the adoption of many heavy trucks and buses equipped with ABS, brake system because many technical issues and truck industry's opposition, in 1978 withdrew this standard. The same year, Bosch, the world's first launch of the ABS electronic control systems, ABS 2 of this set will start the installation as a matching system configuration and assembly in the Mercedes - Mercedes-Benz S-Class car, and then soon equipped with the BMW 7 Series in the luxury sedan. During this period the United States after further study and ABS design work less, but Europe and Japan continue to manufacturer painstakingly researched and ABS. Enter After the 1980s, the United States imported cars equipped with ABS, the United States automobile factory to the United States automobile market, the ABS show new interest. Along with the rapid development of microelectronic technology and automobile traffic safety people on the strong demand of ABS devices in the world automobile industry has been further wide-scale application. In 1987 the United States about 3% of the cars equipped with ABS very reliable. In the ensuing time, the focus on research and development to simplify the system. In 1989, Bosch engineers succeeded in a mixed control unit directly attached to a hydraulic module. So they will be no need to connect the control unit and hydraulic module Harness, and need not plug, significantly reduced the overall weight of ABS 2E. Bosch engineers in 1993, the use of the new solenoid valve created ABS 5.0, and in later years developed version 5.3 and 5.7. A new generation of the main characteristics of ABS 8 is once again greatly reduced weight, reduced volume, increased memory, and an increase of more features such as electronic brake pressure distribution, which replaced the rear axle braking pressure to reduce the mechanical bodies. Then some auto industry analysts prediction proved true: By the mid-1990s, the majority of the world market for cars and trucks will be equipped with ABS. ABS function ABS's main role is to improve the vehicle's braking performance and improve traffic safety, and prevented in the process of braking wheels Locking (that is, stop rolling), thus ensuring that the driver can control in the braking, direction and to prevent rear axle sideslip. Its working principle is: emergency brake, mounted on the wheel rely on the high sensitivity of the wheel speed sensor, once found a wheel Locking, the computer immediately allows the control pressure regulator Brake Cylinder round of pressure relief, restoration of the wheel rotation to prevent wheel Locking purposes. ABS's work process actually "Locking - loosened - Locking - loosened" cycle process, so that vehicles still in a critical gap Locking rolling state, effectively overcome by the emergency brake when the vehicle wheels Locking deviation, sideslip, tail flick phenomena, such as to prevent uncontrolled body the occurrence. ABS types can be divided into mechanical and electronic-two. Mechanical ABS simple structure, the main use of its own internal structure to simple conditioning system dynamic effects. The working principle of a simple device, no sensor feedback to the road, such as friction and wheel speed signal, relying entirely on pre-defined data to work, whether it is water surface, ice or mud road pavement and good cement asphalt pavement, and its working methods is the same. Strictly speaking, this ABS can only be called "High braking system (Advanced Brake System)." At present, only some domestic pickups, and other low-end models still in use mechanical ABS. ABS is used mechanical components to the physical characteristics of the mechanical movements, the electronic-ABS is using computer analysis of the various data and the outcome of the operation. Electronic ABS by the wheel speed sensor, Harness, computers, ABS hydraulic pump, light, and other components constitute. Each wheel according to the wheel speed sensor signal, each computer on wheels respectively impose different dynamic system, so as to achieve scientific and rational distribution system dynamic effects. The ABS system for the first two systems. The so-called two ABS system that is installed in the two rear wheels on the car. As the two rear wheels of a common hydraulic brake pipe and a control valve, also known as a "single-channel control system." This system is based on two wheels after the adhesion of the state to the smaller wheel brake pressure selected, it was referred to as "low-election principle." In other words, the principle of using low-election of a rear-wheel ABS vehicles have Locking trend, the system only to the two rear wheels at the same time pressure relief. No view of the front wheel anti-lock function, thus, two systems difficult to achieve the best braking effect. Along with the development of related technologies, but a "three-channel control system", the system is based on two systems, the two front wheels of the pipeline by two separate independent control. Although rear-wheel or a "low-election principle," but as a result of the emergency brake to prevent rear axle steering function and the function of sideslip, so this modern ABS systems have the main features. So far, there are three such vehicles using the control channel ABS system. At present, the equipment in vehicles is the most common four-sensor four-channel ABS system, are independent of each wheel hydraulic pipeline and the solenoid valve control, we can achieve a single wheel independent control. Such a structure to achieve good anti-lock function. Out of ABS Mistakes ABS those in the very beginning of the misunderstanding, needs an explanation. If the car when Locking wheels in the braking, the car can be lateral adhesion is the minimum. At this time, due to road adhesion coefficient imbalance, the vehicle braking force imbalance, the imbalance suspension, tire pressure, the road bends, or bumpy slope and other factors may have occurred vehicle sideslip, tail flick or out of control. In addition, since the front wheel Locking vehicles, cars will lose steering ability. The excellent performance of a vehicle anti-lock brake system, brake when the vehicle wheels can slip rate control in 20% to 30%, under the wheels in such a state able to combine the relative power of the largest longitudinal and lateral grip, effectively guarantee that the vehicles will not happen out of control situation. In addition, the front wheels do not Locking in the circumstances, as have some grip, cars can be carried out in accordance with the wishes of the driver steering and thus control vehicles. In order to control wheel slip ratio in the ideal state, the stability of the pursuit vehicles may sacrifice some of the vertical system of power. Therefore, the ABS works, not on the road all the braking distance will be shortened. Icy road, as provided by the ground surface adhesion smaller than many. ABS only on the basis of this regulation adhesion vehicle braking force, the brake will not produce additional factors. Therefore, in the ice and snow on the roads than the braking distance can only say that when Locking wheels shorter than the normal braking distance on the roads or much longer. Actual road is very complicated, such as: road adhesion coefficient uneven road surface curvature or horizontal gradient, and even car tire pressure, and other car its own reasons, a number of factors can have a car when braking sideslip in the campaign trends, these factors are not ABS itself can be overcome. Therefore, if an icy road at excessive speed on the emergency brake, encountered one of the factors mentioned above, when the vehicle ground to provide centrifugal force greater than the maximum lateral force, so that vehicles will be formed out of control trend, and this is very dangerous. In short, any equipment is not omnipotent, the driver must pass their own initiative to achieve safe driving. Even the excellent performance of ABS and stability in the work of state vehicles is limited effect, especially on the road or snow on the roads, but should maintain a distance of the full, slow trip slowdown, we should not be dependent on ABS system. ABS use common sense Now all the passenger cars are basically the installation of the ABS system, the initiative to enhance the safety performance of vehicles play a very great role, but if used improperly, the effect will be little. Here, we use the ABS principle summarized in the "four to seven not." Fourth, we must 1. We should always stay brake pedal not relax in order to guarantee adequate and sustainable system, to enable ABS to function effectively. 2. To maintain adequate security from the car. Under normal circumstances, should not be lower than the minimum distance to 50 m, when the speed exceeds 50 km / h, with a distance of the smallest numerical same speed as 100 km / h for a distance of at least 100 m, 120km / h, the smallest for a distance of 120 m. 3. Prior to familiar with ABS, and make our own work on the ABS brake pedal jitter are prepared and adaptability. 4. Prior to read vehicle drivers manual, which will further understanding of the installation of ABS car provided by the manufacturers instructions. Not 7 1. ABS will not think that we can have arbitrary driving. ABS is not absolute insurance, and in high speed turning Drastic circumstances, if excessive vehicle braking too radical, it will still have a car sideslip. Therefore, even if your car with ABS, you still need to caution motorists. 2. Do not use the "sa" braking. Vehicles not equipped with ABS in the wet and slippery road conditions and high speed implemented under braking, the need for a "selectively" approach is safe braking purposes. After fitted with ABS and, as ABS braking force can be automatically adjusted, in the implementation of emergency braking, they can put in the end will not loosened stamping on the pedals, not to worry Locking wheels slipping, or they will greatly extend the braking distance. 3. ABS jitter not to be deterred. ABS at work, it will hear the noise, noise from the hydraulic control system of electromagnetic valves and hydraulic pump at work, and not think that the brake system defects and a panic, not to pin removed from the brake pedal, the brake pedal at this time still to death and Watch it. 4. Not to be ignored ABS indicator of the screening test. Under normal circumstances, according to Qualcomm ignition switch, the lights should be bright; After about three seconds automatically extinguished. This process is in essence an electronic control device in the self-inspection procedures by the wheel sensors, hydraulic control valve regulator for the electricity checks If this has not bright lights, the ABS defected. 5. ABS light is not extinguished when not panic. When the ABS failure in the lane, Anti-lock Braking System automatic braking system Circuit original linked to the original car braking system still work, but no ABS, attention to the maintenance on it. 6. ABS not secretly manipulate the computer unit. If the computer found fault, ABS should replace the entire unit. 7. For equipped with ABS, but that converted vehicles to enter the removable ABS brake pipe and the nut connecting module.