With the advancement of society and the development of science and technology, the traffic density is increasing day by day. Due to the frequent and frequent traffic accidents caused by brake failure, the limitations of traditional braking methods are becoming more and more obvious. Retarders - The advanced technology used in buses has become an urgent need for social transportation. The retarder is an auxiliary braking system that can slow down the vehicle and improve the safety of the vehicle without using the main brake. In addition, because its principle of action is different from the traditional braking method, it also has the effect of extending the service life of the drive train and brake system. With the advent of new brake control accessories, the use of retarders will become a new driving trend, and the instantaneous rapid response of the retarder will be more effective. , This article refers to the address: http:// 1 Comparison of retarder brake and other brake functions Modern brake systems mainly include: traditional axle brakes (also known as first brakes), engine brakes (also known as second brakes), and retarder brakes (third brakes). 1.1 Problems with axle brakes Modern high traffic density makes frequent braking (according to the investigation, the number of bus brakes in traffic-intensive cities can reach 4000-5000 times/day) and the long-term braking on downhill will cause brake overheating, resulting in system Dynamic efficiency degradation, even brake failure, especially the unsafe factors lurking when the passenger car goes downhill, will directly endanger passenger safety. Moreover, the brake shoe has a short service period, and it is necessary to frequently stop and replace the shoe, thereby causing an increase in operating cost, and the vehicle brake often emits a harsh "beep" noise, and the wear of the friction plate material during braking also pollutes the environment. The dust, which has long plagued bus users. Although disc brakes have gradually replaced drum brakes, they still cannot solve the problem fundamentally. 1.2 Problems with engine braking Modern engines are only sufficient to meet demand when the passenger car is at low speed and the engine is at high speed. Although the engine is a turbocharged engine, the engine can only provide stable but low braking performance due to the relatively low compression ratio. Only when the engine is running at high speed can it produce obvious effects, and the engine brake can only be produced. Both dynamic and non-braking options, the braking performance can not be controlled as needed. As environmental awareness increases, so does the noise generated by engine braking. 2 retarder brake characteristics a. It can bear most of the braking load during vehicle operation, greatly reduce the temperature rise of the wheel brakes, and ensure that the wheel brakes are in a good technical state, so that they can cope with the emergency braking. b. It can provide a strong braking torque over a wide range of speeds, and it has good low speed performance. The retarder provides a slow brake when the vehicle speed is 10km/h. c. As a relatively independent and responsive auxiliary brake system, its rotor is fastened with the drive shaft, and the brake torque can be supplied at any time according to the driver's wishes, so its braking performance is better than the engine platoon. Air brake. d. Direct drive with current, no intermediate link, its response time is very short, only about 40ms, 20 times faster than the response time of the hydraulic retarder. e. Since there is no contact between the stator and the rotor of the eddy current retarder, there is no wear, and the failure rate is extremely low. In addition to routine inspection and maintenance, there are few other work, so the maintenance cost is extremely low.
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