【Scientific and Technological Achievements Promotion】 Automotive Hydraulic-Electric Retarder

With the development of automobile industry technology and the improvement of road traffic, heavy vehicles show the development trend of high speed and large tonnage, which greatly increases the braking load of vehicles. Traffic accidents caused by large-tonnage vehicles continue to occur, and more stringent requirements are put forward for automobile braking devices. High speed, overload, long downhill and frequent braking also threaten the safety of heavy commercial vehicles in road transportation. In this case, the brake provides a guarantee for the safe driving of the vehicle. It uses the open brake shoe to compress and rub the hub on the wheel, so as to achieve the purpose of deceleration or braking of the wheel. However, long-term friction will cause The friction coefficient of the brake is reduced, the braking performance is reduced, and even its braking ability is completely disappeared, causing serious consequences. Therefore, a single mechanical braking system has been difficult to meet the braking requirements of heavy vehicles. In order to ensure that heavy-duty vehicles have good driving safety, comfort and economy, and to solve the problem of serious deterioration of braking performance caused by continuous braking of vehicles on downhill slopes, retarders are widely used on heavy-duty vehicles at home and abroad. Braking device.

 

In today's retarder market, eddy current retarders and hydraulic retarders occupy the main market share. Among the different types of retarders, some are heavy in weight, high in energy consumption, and some are complex in structure and high in price. In order to better combine the advantages of various retarders, today I would like to introduce to you a grand introduction. The hydraulic-electric retarder developed by our hospital's advanced automobile retarder is at the leading technical level in the world.

 

Before introducing, let's first understand the development of auxiliary braking devices in the world.

 

 

At present, in the domestic market, eddy current retarder accounts for more than 80% of the market share, and hydraulic retarder accounts for 10% of the market share.

 

science and technology research and development

 

What are the characteristics of these two commonly used retarders on the market:

 

eddy current retarder

Advantages: simple structure, low price and fast response speed.

Disadvantages: heavy weight, severe heat recession, energy consumption.

 

 

hydraulic flow retarder

Advantages: small weight, no energy consumption, small thermal recession.

Disadvantages: complex structure, high price, slow response speed.

 

 

science and technology innovation

 

The electro-hydraulic retarder developed by the advanced automobile retarder adopts the principle of eddy current braking. The eddy current is generated by the magnetic field gathered by the rotor to the inner surface of the stator, so that the rotor (automobile drive shaft) generates eddy current resistance torque, thereby slowing the vehicle. It is a non-contact brake.

The rotor of the product does not generate heat, and the heat generated by the stator is discharged through its internal water channel, which can greatly reduce the working temperature of the retarder, effectively solve the problem of braking torque attenuation, and make the product have high stability.

At the same time, the use of water-cooled heat dissipation, strong heat dissipation capacity, retarder working temperature below 90 ℃, can work continuously for a long time, stable braking performance, braking torque heat decay is small, you can stop immediately.

 

 

Heat dissipation system

The coolant passes from the engine to the retarder water jacket, through the thermostat and into the engine or cooling water tank.

If the temperature of the coolant is less than 80°C, the large cycle of the thermostat is closed, and the small cycle path of the engine cooling system returns to the water return port of the engine.

If the temperature of the coolant is greater than 80 ℃, the valve of the thermostat is opened. According to the large circulation path of the engine cooling system, the coolant flows around the water jacket wall and absorbs heat from the water jacket wall, and flows into the cooling water tank through the engine water outlet.

 

 

The hydraulic and electric retarder can be installed in multiple positions such as the engine, gearbox, wheel hub, and axle.

 

 

 

Data Test

 

Let's look at the comparison of the parameters of weight, number of parts and thermal decay of braking torque between eddy current retarder and hydraulic electric retarder under the same torque:

 

 
Note: Electro-hydraulic retarder is also called electromagnetic liquid-cooled retarder.

 

Parameter comparison

 

 

Advantages of electro-hydraulic retarder

1. Low energy consumption

2. Small thermal recession

3. Large braking torque

4. Simple structure and low cost

5. Suitable for installation in multiple locations

 

Basic functions that can be achieved

 

Gear detection:Graded output 25%,50%,75%,100%.

Temperature detection:When the water temperature is greater than 95 ℃, the retarder is reduced to the second gear, and when the coil temperature is higher than 150 ℃, it is shut down.

Brake status display:Corresponding gear.

Linkage with foot control.

Speed detection:Low speed shutdown-the retarder does not operate when the vehicle speed is less than 5km.

Brake light:The brake light is on when the retarder is working.

Fault upload:Alarm-retarder coil fault alarm.

 

Electro-hydraulic retarder product series

 

    

Rear-mounted electro-hydraulic retarder for passenger cars Product series Mid-mounted electro-hydraulic retarder for light cards Product series

 

   

Mid-mounted electro-hydraulic retarder for heavy truck Product series Electro-hydraulic compound retarder for heavy truck Product series

 

     

Integrated retarder bridge for trailer product series Mid-mounted electro-hydraulic retarder for light card product series

 

Industrial Applications

 

　　1、Cooperation with Qingte Group

Germany's Hannover Commercial Motor Show shows integrated retarder bridge

This retarder is used for trailers to brake directly on trailers and is applied to semi-trailer tractors.

 

 

　　2、Cooperation with BAIC Foton

Foton Omarco hazardous chemicals vehicles are equipped with rear gearbox and middle retarder

 

 

　　3、Cooperation with bus manufacturers

Foton 51 passenger car with gearbox rear retarder

 

 

　　4、Cooperation with Qingte Group

Installation of axle retarder for semitrailer tractor

 

 

　　5、Xugong Mine Car Cooperation (Tongling Mining Area)

 

 

Advanced Automotive Retarder Research Institute

 

The Advanced Automotive Retarder Research Institute was established in June 2016. The team leader is Professor Li Desheng of Beijing University of Technology. The team consists of a professor, two associate professors, and a number of masters and doctors. In view of the shortcomings of foreign retarder products and the backward situation of domestic retarder research and development, the Institute relies on the intellectual resources of well-known domestic universities, grasps the most cutting-edge technology of international retarder, and realizes the research and development and industrialization of new electro-hydraulic retarder. At present, it has closely cooperated and exchanged with Beiqi Futian, Qingte Group, Changchun FAW, China National Heavy Duty Truck, etc., and has successfully incubated the industrialized company Qingyan Ruineng (Tianjin) Technology Co., Ltd. As a future social demand, the team will further develop energy recovery retarders to meet the needs of further energy conservation and emission reduction in the country and even in the world.

 

Technical docking and business negotiation

 

Contact: Miss Li

Telephone: 18526682309

Email: lids@tsinghua-tj.org

 

 

 

Source | Advanced Automotive Retarder Institute

Editor | Wang Xiao

The final interpretation of the above related technologies belongs to the Advanced Automotive Retarder Research Institute.