What is the principle of automobile valve exhaust
The basic function of the automobile exhaust valve is to control the exhaust gas discharged from the cylinder to ensure that the exhaust gas after combustion can be effectively discharged, to make room for fresh air and fuel mixture, so as to maintain the continuous combustion cycle of the engine .
The working principle of a car's exhaust valve is based on the four basic strokes of the engine: intake, compression, work and exhaust. During the exhaust stroke, the piston moves upward and the exhaust valve opens, allowing exhaust gas to escape from the cylinder. The opening and closing of the exhaust valve is controlled by the camshaft, and the CAM shape on the camshaft determines the opening time and duration of the exhaust valve. Specifically, an exhaust valve usually consists of a valve, seat, spring, and stem. The valve remains closed with the action of the spring until the CAM on the camshaft pushes the stem and overcomes the spring force to open the valve. Once the camshaft's CAM is through, the spring quickly closes the valve, ensuring that the exhaust gas does not return .
Exhaust valve optimization and maintenance By adopting variable valve timing technology, modern automotive engineers adjust the opening time and duration of the exhaust valve according to engine load and speed to improve combustion efficiency and reduce emissions. In addition, some high-performance engines feature a multi-valve design with multiple intake and exhaust valves per cylinder to increase airflow speed and improve combustion efficiency. Regular maintenance and inspection of the exhaust valve can ensure that it is in good working order, including checking valve and seat wear, replacing worn parts, and adjusting valve clearance .
The main role of automobile valve exhaust includes the following aspects :
Reduce the dependence on service brake : exhaust brake valve can significantly reduce the dependence on service brake in the process of driving, thereby reducing the degree of wear of brake shoes or disks, and effectively avoid the safety risks caused by continuous braking overheating .
Stable turbocharging system : The exhaust valve plays a key role in the turbocharging system, which can stabilize the propulsion pressure and ensure the stable operation of the engine and turbocharger. By controlling the exhaust back pressure, valve exhaust optimizes engine performance, especially at medium to high RPM .
control exhaust sound : The valve exhaust device can control the size of the exhaust sound wave and adjust the sound of the exhaust pipe by opening and closing the valve. When the valve is closed, the exhaust sound is small, suitable for use in a quiet environment; When the valve is opened, the exhaust sound increases, similar to the sound of a sports car .
Environmental benefits : valve exhaust gas by recycling a small amount of waste gas into the cylinder combustion, reduce the combustion temperature, thus inhibiting the production of NOx, reduce the NOx content in the exhaust gas, help to environmental protection .
Various control methods : valve exhaust control methods are various, which can be realized by remote control, mobile phone APP or automatic speed control. When using the remote control, just press the open button, the wireless signal will be transmitted to the valve controller, and the controller will control the valve to open after receiving the command.
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