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.
f. Since the eddy current retarder can bear most of the braking torque of the vehicle, the service life of the wheel brake can be prolonged, the maintenance cost for the vehicle brake system can be reduced, and the economic benefit can be improved.
g. If the eddy current retarder fails, the retarder can be turned off if the repair parts cannot be supplied in time, and the vehicle can continue to operate without affecting the normal use of the vehicle.
h. The eddy current retarder can bear most of the load on the wheel brakes, thus greatly reducing the environmental impact of the wheel brakes.
The correct use of the eddy current retarder is not only the function of the retarder, but also the important part of improving the safety performance of the vehicle and improving the transportation efficiency. It is also the key to ensure the long-term stable operation of the retarder.
a. Under normal circumstances, the manual control method can be used as much as possible, which can greatly reduce the load of the wheel brakes and avoid the overheating of the wheel brakes, so that they are always in good working condition, so that when an emergency situation occurs during driving, it can be freely .
b. When the vehicle is unloaded or driving on snowy, muddy roads, due to the poor adhesion of the wheel to the ground, when using the control handle, be careful not to lift the gear too fast, so as not to cause the rear wheel to be too strong. Slippage.
c. When the vehicle is driving in the mountains, especially when going downhill for a long distance, remember not to continuously put the retarder handle control switch in the highest gear (usually placed in the second gear) to avoid the overheating of the retarder. Causes the coil to burn out. When the road surface is steep or in a sharp bend, the main brake can be used alternately to control the speed of the vehicle.
d. When parking, if the manual switch does not return to zero, it should be restored in time to avoid unnecessary consumption of electric energy and overheating. When the manual switch returns to zero, it can be completed at one time without stopping in the middle block. When the retarder is stopped, the retarder work indicator on the instrument panel should be off; if the indicator is lit continuously, check and troubleshoot. The main power switch must be turned off when the vehicle is stopped.
4 Conclusion
With the advancement of society, more and more high-tech technologies will gradually be applied to modern transportation, and the retarder as an auxiliary brake system is applied to buses and can be trusted in the global market. The ABS (Brake Anti-Hold) system is compatible, and its many advantages prove that the retarder will become a necessary safety device for long-distance buses and city buses. The application of retarders will also become a bus manufacturer in the future. An important project to seize the market.
Auto Identify Technology - The LENCENT multi usb plug charger would identify the connected devices intelligently and provide optimized charging universal compatibility. It`s suitable with electronic devices and models, from iPhones, Samsungs, HTC Nexus, Mp3 Players, Bluetooth Speaker Headsets to iPads and Power Devices
High Speed Charging - Each port could offer maximum current up to 4.4A, fast-charging for any connected device efficiently, definitely you can charge 4 devices at the same time
Certified Safe - The certifications of EMC/LVD/ROHS make this travel plug a safety system with which would automatically stop charging once the devices are fully charged, or overheat, over-load, or short circuit
★Ideal for Travel - Portable Sized USB plug adapter with Interchangeable UK/USA/EU/AUS plugs and international voltage compatibility, makes it easy for multiple devices charging, anywhere you go (apply for type A / C / E / F / G / I )
Iphone Travel Charger Europe,Travel Charger Best,Travel Charger Dual Usb,Usb Travel Charger
Dongguan City Leya Electronic Technology Co. Ltd , https://www.dgleya.com