The hydraulic retarder is also called the "artifact" for safe driving by the majority of card users. Its biggest advantage is that it can effectively adjust the speed during the long downhill process, and it can also greatly reduce the use of the brake device and greatly improve the driving safety. sex.
1. Constant speed gear and brake gear
The hydraulic retarder equipped with the Dayun heavy truck, the first gear is a constant speed gear, similar to the "constant speed cruise" mode, which is to keep the vehicle speed constant above the set value (for example, the vehicle speed before going downhill is 50km/h, Enter the downhill and open the constant speed gear, the vehicle will keep moving forward at a speed of about 50km/h, and the retarder will monitor the speed of the vehicle downhill in real time to control the braking power of the retarder, and stabilize the speed at about 50km/h). Once the vehicle speed is less than the set speed of 50km/h, the retarder will automatically exit the working state. If the vehicle speed exceeds the set speed at this time, the retarder will continue to enter the working state and control the vehicle speed in real time.
It should be noted that the constant speed gear is generally suitable for the road scene conditions of long downhill. In addition, according to the requirements of the retarder for the engine speed, when using a constant speed gear, it is generally necessary to keep the engine speed above 1500 rpm. big effect. If the engine rotates below 1500 rpm when using the constant speed gear, the braking work of the retarder is likely to be reduced or withdrawn. We should use the gearbox to downshift to increase the engine speed so that the retarder continues to work normally . If the gravity of the vehicle is too high when going downhill, and the speed of the vehicle continues to increase when using the constant speed gear, you should step on the brake pedal to assist the vehicle to decelerate, instead of directly dialing the retarder handle to the maximum gear.
The 2-5 gear (or 2-4 gear) of the hydraulic retarder is a mandatory retarder, which can be used on downhill and flat roads. According to the road conditions and the speed of the vehicle, turn the handle gear by gear to select the appropriate gear to slow down the vehicle. The lowest gear corresponds to the lowest braking torque (generally 25%), and the highest gear corresponds to 100% of the braking torque. In the process of going downhill, our card friends can maintain the stability of the vehicle speed by increasing or decreasing the deceleration force of the retarder. The high brake gears (4th and 5th gears) have a very large braking torque. Using the highest gear for a long time is likely to cause the engine's heat dissipation effect to be unable to keep up, and the water temperature will soon rise, so the brake gear ( Especially the highest gear) is generally only used for short-distance braking that requires deceleration, and a constant-speed gear is generally used in long downhill conditions.
2. Precautions for the operation of hydraulic retarder
In the process of using liquid buffer, you should pay attention to the following aspects:
1. Remember! The retarder is only an auxiliary braking device, and the brakes are still required for emergency braking and parking.
2. Use the constant speed gear as much as possible, and let the fluid slow down automatically adjust the braking force according to the set speed and the current speed, so as to achieve the purpose of downhill at a constant speed.
3. When using the hydraulic retarder, remember to increase the braking force step by step, and never directly hit the highest gear from the zero gear, and do not use the hydraulic retarder step by step.
4. Select the appropriate gear and let the engine speed reach more than 1500 rpm, so that the heat dissipation system of the engine can effectively dissipate the heat transferred from the liquid buffer into the air.
5. When the vehicle is in the neutral state, the speed is low, and the engine water cycle is slow at this time. The engine water temperature may rise after the retarder is used for dozens of seconds, causing the retarder to quit working. Therefore, when the retarder is used The transmission cannot be in neutral.
6. Don't overload, any component is designed to have its acceptable range. When the vehicle is overloaded, if the kinetic energy generated by the downhill far exceeds the limit that the hydraulic retarder can bear, the hydraulic retarder may be "unreliable". ".
7. The fluid retarder can basically be regarded as a non-wearing auxiliary brake component, so its maintenance and maintenance are very simple. Our card friends only need to complete the replacement of the oil and filter element according to the requirements of the vehicle type and workload.
8. Pay attention to the working conditions of the retarder, and the ice and snow roads are disabled!
