China's land area accounts for 69% of the mountain area (including hills and plateaus), and mountain roads account for a significant portion of the total road mileage. When driving downhill on a mountain road, the main braking system is generally used to convert the potential energy and kinetic energy of the car into heat energy. In the continuous downhill driving, the thermal load of the brake system of the commercial vehicle is very large, and the brake system cannot release the heat to the surrounding environment in time, so that the temperature of the brake hub and the brake shoe is greatly increased. The brake loses or partially loses braking performance, and as a result, traffic accidents occur on successive downhill ramps more frequently than other roads. In fact, the role of the main brake is to achieve braking in an emergency, because it can absorb a lot of power in a short time, but as the braking duration increases, the power it can absorb is greatly reduced, and finally The brake system cannot meet the braking requirements of the car downhill. This braking process should be carried out by the continuous braking system. This is because the continuous braking system absorbs less power during the braking process, but it can keep the braking power unchanged for a long time. A little has been fully recognized abroad.
No damage to the machine. Frequent use of the gearbox damage, engine braking by downshifting, the most stressed is the gearbox, it is best to slow down and downshift. The use of engine braking for long downhill slopes can effectively reduce brake thermal attenuation.
Engine braking should be an energy-saving, inefficient braking method that briefly switches between speed and speed. It is suitable for decelerating speed reduction in a certain speed range. It should not be recommended at high speeds unless emergency, engine braking is similar. Trailer trailer.
Is the engine brake good? Here is the correct posture!Engine braking refers to lifting the accelerator pedal, but without pressing the clutch, the compression resistance generated by the compression stroke of the engine, the internal friction force and the intake and exhaust resistance form a braking effect on the driving wheel.
When the car is slid, there is a power connection between the engine and the drive wheel. At this time, the running state of the engine is to change to the idle state, the rotation speed is decreased, and the drive wheel always wants to keep the engine "synchronized" with it. The result of the two "competitive" is that the engine speed does not drop immediately, but gradually decreases, but at the same time the speed of the drive wheel is also "drag" significantly reduced by the engine (engine brake), and not as fast as the neutral slide Scroll forward.
Engine braking is to change the torque of the transmission to brake. According to the formula P=FV, the engine speed is constant in a short time. It can be determined that the output power is constant in a short time, then the traction is larger. The slower the speed, the higher the speed of the emergency shifting the transmission step by step, then the output power of the car is relatively large, so the speed will slow down, this is the engine brake.
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