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* Engine Brake is Global trade credit risk analysisan auxiliary braking method that can use the pressure of the engine to suppress the speed of the vehicle, so as to ensure safety and reduce brake pad wear in the downhill section. . This article will discuss the principle of engine exhaust braking, application analysis, advantages and disadvantages. I. Principle Engine exhaust braking refers to changing the compression and expansion process of the engine by changing the opening and closing state of the intake and exhaust valve, so as to achieve the purpose of braking. Specifically, on the engine compression stroke, the intake valve is closed and the piston moves up to compress the gas; on the expansion stroke, the exhaust valve is closed and the piston is pushed down by the high-pressure gas, which is the regular working state of the engine.When the engine exhaust brake is required, the unloading mechanism will rotate the camshaft at a certain angle. At this time, the intake and exhaust valve is closed at the same time, and the camshaft is lifting the piston of the crankshaft down. At this time, the high-pressure gas in the cylinder cannot be discharged smoothly. At the same time, because the energy of the crankshaft rotation is caused by the change of kinetic energy to the piston. Force absorption, this kind of resistance will inhibit the movement of the vehicle and play a braking role. II. Application 1. The engine exhaust brake on the ramp is very common in ramp driving. It can adjust the speed according to the angle of uphill and downhill to ensure safety. For example, using engine exhaust braking when going downhill can relieve the burden of the main brake system, prevent the brake pads from wearing out for a long time, and also make it easier for the driver to control the speed and improve driving safety. Two. Toy car brake engine exhaust brake is also often used in small red toy racing cars for competition.It is a relatively simple braking system that can provide players with excellent turning performance while maintaining high speed. In this case, the engine exhaust braking almost occupies the main way of vehicle braking. 3. Long-distance driving is a driving method that tests the safety and durability of the vehicle brake system. Therefore, engine exhaust braking can be used as a means of auxiliary braking. When the speed exceeds 100 km/h, it is very effective to use engine exhaust braking to slow down, especially in the case of emergency braking, which can greatly reduce the wear of brake pads. III. Advantages and disadvantages: 1. Reduce the burden on the brake system: The engine exhaust brake can reduce the burden on the brake while driving, and reduce problems such as carbonization, thermal wear and air leakage. Two. Extend the service life of the brake: When the engine exhaust brake is used frequently, the service life of the brake can be effectively extended.3. Safer driving: Engine exhaust braking can steadily reduce the speed and improve safety. Disadvantages: 1. Although the engine exhaust braking can reduce the speed better than the main brake system, if used excessively, it will accelerate the consumption of the life of the engine and brake system. Two. If driving on a slippery or icy road, the engine exhaust brake cannot completely avoid the brake sliding, which will affect the braking effect. IV. Summarize that engine exhaust braking is a relatively common brake mode, which has the advantages of simplicity, ease of use and energy saving, but there are also some details that need to be paid attention to in actual use. Therefore, when choosing the engine exhaust brake, it is necessary to evaluate and compare according to the actual situation, and consider the use in combination with the characteristics of the vehicle itself and the driving conditions.

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