Some time ago, the high temperatures continued unabated. Many of the card friends stepped on the brakes while driving and the brakes became hot. For this reason, there are a lot of high-grade vehicles that have started to install engine brakes, and do not use the brakes on the up-and-down slopes. So what's the engine brake? Actually, engine brakes are also divided into several types. Generally, we divide the engine brake into three categories according to different principles and engine-assisted braking systems: exhaust brake, deflated engine brake and compression engine brake. These three categories have their own characteristics and are very different. Let's listen to Xiaobian for everyone's analysis.

Exhaust brake

Exhaust brakes typically incorporate a butterfly valve brake control mechanism on the exhaust pipe. After the driver brakes using the butterfly valve, the butterfly valve rotates to block the exhaust pipe, forming a controllable back pressure in the cylinder of the engine to increase the power consumption of the engine exhaust stroke, forcing the engine to reduce the rotational speed, thereby achieving a reduction in a short period of time. The purpose of speed. Exhaust butterfly valve structure is relatively simple, high cost performance, the lowest braking effect.

Exhaust brake can be simply understood as blocking the exhaust pipe of the engine, leaving the engine out of motion, and then the engine operation is hindered, which indirectly reduces the speed of the vehicle!

Vented engine brake

There are also many products on the market for deflated engine brakes. When the deflation brake is working, the exhaust valve is opened to a small gap, so that the engine releases the compressed energy through the deflation during the compression stroke, so that almost no energy is returned to the piston during the power stroke. . The exhaust stroke relies on the back pressure generated by the exhaust butterfly valve or VGT turbocharger to increase intake and exhaust power.

The deflated engine brake is equivalent to always opening a small door on the cylinder, so that the compressed gas leaks out, can not push the piston to do work, indirectly, reduce the speed.

Compression engine brake

The main principle of compression engine braking is to change the valve timing of the engine exhaust valve. At the end of the compression stroke, the exhaust valve is opened so that the work done by the engine when compressing the air in the cylinder is released to the exhaust. system. During the stroke of expansion work, the exhaust valve is closed, the inside of the cylinder is close to the vacuum state, and the downward movement of the piston is similar to a vacuum process, resulting in negative work. This type of brake has the highest power, the most complex structure, and of course the most expensive price.

The compression engine brake is like a syringe. When we push it down, we block the mouth and we push hard; when we push it, we release the mouth, and then pull it back and then block it. The result is also pulled. With this principle, the engine has been dragging the vehicle to reduce the speed!

Three engine brake comparison

Of the three types of engine-assisted brake mechanisms, only the third type is implemented inside the engine, and the effect is also the best, so it is called "primary" engine brake. However, when we select the engine brake, the first thing to consider is the safety issue. Driving a vehicle with an engine brake, the driver is more comfortable and does not need to worry about safety problems such as brake failure. And the rational use of engine brakes is also of great benefit to saving the operating costs of vehicles.

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