Hydraulic brakes will gradually be eliminated by electronic
In the car, the traditional hydraulic brake system was replaced by a responsive and simple electronic brake system. The industry started discussions several years ago, and the research and development work of many auto parts companies has been ongoing. Compared with the traditional hydraulic brake system, the electronic brake system eliminates the hydraulic wheel cylinder, the parking brake device, the brake master cylinder, the vacuum booster, the hydraulic brake force distribution pump, etc., thereby realizing the simplification and maintenance of the brake system. Reduced mass, increased passenger compartment space, and reduced braking distance. Siemens VDO has tested the EWB electronic wedge brake system in the snow in Sweden last year, equipped with EWB testing
The car brakes from 80 km/h to full rest, requiring only a braking distance of 64.5 m. The traditional hydraulic brake system with ESP requires an average braking distance of 75 meters and a full reduction of 10.5 meters at the same speed and road conditions. This means that when the test vehicle equipped with the EWB system has completely stopped, the car with the traditional hydraulic brake is still moving at 30 km/h.
The use of an obvious electronic brake system in the aerospace industry has become quite common and has demonstrated the outstanding braking performance of the system. The reason why it has not been applied in the car for a long time is mainly due to two aspects. The first is the high cost of the electronic brake system. The second is that the electronic brake system may be interfered by other signals and cause misoperation. After all, the use environment of the car is more severe and complicated than the aircraft, and the user's professionalism is also Not as good as the plane. The traditional hydraulic brake system does not affect its normal operation due to the surrounding electromagnetic and pulse signals, and still has the advantages of simplicity and reliability.
Auto parts companies such as Bosch, Continental and Siemens VDO have a team responsible for the development of electronic brake systems. Recently, European media reported that the company's automotive electronic brake system made a breakthrough and abandoned the common wedge structure. The new design effectively solved the two problems mentioned above and is close to the requirements of mass production. However, the mainland company's solution is to use the electronic brake system only in the rear wheel. This compromise can be matched with the future 锲-type electronic brake system, while at the same time borrowing the traditional hydraulic brake system to control the cost, thus advancing the technological progress. If an electronic brake system is used on all four wheels, the cost will be 20% higher than conventional hydraulic brake systems. And reliability is always the most important issue for these companies. If a recall is needed, the company will not be able to withstand such huge losses. Mercedes-Benz recalls the SBC brake system and is listed as a typical low-reliability advanced brake system. Case.
Although the prospects of electronic brake systems are very objective, the research and development costs are also very large. In the absence of government funding for these parts and components companies, the inability to achieve mass production will cause great resistance to research and development. The choice of compromise in the mainland should be a desirable approach, which will accelerate the pace of system mass production. .
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