What are the types of boost pressure regulation devices?

[McFinley]

Boost pressure regulation devices include the following types: 1. Mechanical exhaust bypass valve. The exhaust bypass valve boost pressure regulation device is the most economical and structurally simplest regulation device. When the boost pressure exceeds the set value, the pressure above the diaphragm drives the diaphragm, overcoming the spring pressure below, and opens the exhaust bypass valve through the connecting rod, allowing part of the engine exhaust gas to pass through the bypass valve, reducing the amount of exhaust gas entering the turbine, thereby lowering the boost pressure. Conversely, when the boost pressure is below the set value, the exhaust bypass valve closes, increasing the turbine intake and raising the boost pressure. 2. Electronically controlled exhaust bypass valve. The turbocharger compressor boost pressure outlet is equipped with a pressure sensor. The electronic control unit compares the pressure transmitted by the sensor with the pre-stored target boost pressure, and then the electronic control unit outputs the duty cycle of the pulse signal to the solenoid valve. The solenoid valve controls the opening of the exhaust bypass valve to regulate the amount of exhaust gas entering the turbine, thereby precisely controlling the boost pressure.