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Engine intake and UEFA TVexhaust valve (engine valve system: working principle and function of intake and exhaust valve) The engine is the heart of a car. It generates power by burning gasoline or diesel to drive the vehicle. In the engine, the intake and exhaust valve is responsible for controlling the inlet and out of gas, which is an important part of the engine valve system. The following will introduce the function of the intake and exhaust valve from the two aspects of working principle and function. I. Working principle 1. The intake valve is the valve that is responsible for entering air or mixed gas into the engine. It is usually installed on the cylinder head and opened and closed by the swing of the camshaft. The camshaft is a rotatable shaft with many raised cams on it. When the cam comes into contact with the valve rod, the valve will be pushed open.The operating speed of the camshaft is determined by the speed of the engine and the number of cylinders. Normally, the opening time provided by the intake valve camshaft of a four-stroke engine is 200 degrees to 250 degrees. During this period, the valve opens at about 150 degrees to 200 degrees. When the intake valve is opened, the pressure in the cylinder is lower than the atmospheric pressure, and the air enters the cylinder through the intake valve. After the intake valve is closed, the top of the piston is adjacent to the cylinder, and the air in the cylinder is compressed. Two. The working principle of the exhaust valve is similar to that of the intake valve, but its function is to exhaust the engine after combustion. The exhaust valve is usually installed below the camshaft, opposite the intake valve camshaft. The exhaust valve is also opened and closed by the camshaft, and the opening time of the exhaust valve is about 180 degrees. The timing of the exhaust valve is very important.If the exhaust valve is opened too early, it will cause high-temperature and high-pressure gas to enter the exhaust pipe, burn gasoline, and the emitted substances will become harmful gases that have not been completely burned. If the exhaust valve closes too late, it will affect the efficiency of the engine. II. The functional intake and exhaust valve is one of the core components of the engine valve system. Its normal operation will greatly improve the efficiency of the engine. 1. Control the inlet and out of the air. The inlet and outlet valve of the engine can control the inlet and out of the air, thus affecting the output power of the engine. When the engine speed is low, the opening time of the valve will be extended, allowing air to enter more fully and providing sufficient fuel supply, so that the engine has enough power. When the speed increases, the opening time of the valve will be reduced to ensure full combustion without wasting excess fuel. Two. Strengthen the exhaust effect of the exhaust doorNormal operation can also accelerate the discharge of exhaust gas, reduce the engine load, achieve the effect of energy saving and emission reduction, and improve the operating efficiency and stability of automobile engines. 3. Extend the life of the valve. The intake and exhaust valve needs to withstand high-intensity pressure and fatigue when working, so it needs to be maintained and replaced regularly to extend its life and ensure the normal operation of the engine. In a word, the intake and exhaust valve is a very important part of the engine valve system, and its normal operation has a great impact on maintaining the efficiency, stability and reliability of the car. Maintaining the engine valve system is an important measure to ensure driving safety and environmental protection.

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