The function of turbine solenoid valve, working principle of turbine solenoid valve

The action of the turbine solenoid valve overcomes the spring pressure and the exhaust gas flow separates. In a turbocharger system with a wastegate valve, the solenoid valve controls the opening time of atmospheric pressure according to instructions from the engine control unit ECU. The control pressure acting on the pressure tank is generated based on the boost pressure and atmospheric pressure. The working principle of the turbine solenoid valve is in the high speed zone, the turbine speed is high, and the air compression ratio may be too large. In the low speed zone, the turbine speed is low and the compressor impeller speed will not reach the required speed. The exhaust gas turbocharger with bypass is equipped with a wastegate valve. In the high speed zone, part of the exhaust gas does not enter the turbine and enters the exhaust pipe directly through the bypass. This system does not work in the low speed range. This will result in engine pressure and high power. Turbochargers with adjustable guide vanes Exhaust gas turbochargers with adjustable guide vanes (VGT = variable turbocharger geometry) are standard in diesel engines. The VGT supercharger uses adjustable introductory vanes in the exhaust gas turbocharger instead of a bypass valve. The exhaust gas flow affects the turbine through the adjustable introductory vanes. The adjusting vanes are operated with the help of a vacuum canister. Unlike an exhaust gas turbocharger with a wastegate valve, a VGT supercharger provides the required air compression ratio not only in the high rpm range but also throughout the entire rpm range. . The pressure control of the boost pressure limiting solenoid valve N75 is controlled by the engine control unit ECU. In a turbocharger system with a wastegate valve, the solenoid valve controls the opening time of atmospheric pressure according to instructions from the engine control unit ECU. The control pressure acting on the pressure tank is generated based on the boost pressure and atmospheric pressure. The exhaust bypass valve overcomes the spring pressure and the exhaust gas flow separates. The flow from one part of the turbine to the other part of the wastegate entering the exhaust pipe is not used. When the power supply fails, the solenoid valve will close and the boost pressure will act directly on the pressure tank. Principle The rubber hose is connected to the supercharger compressor outlet, boost pressure adjustment unit and low-pressure air intake pipe (compressor inlet) respectively. The engine control unit supplies power to the solenoid valve N75 during the working cycle to change the pressure on the diaphragm valve of the boost pressure regulating unit to adjust the boost pressure. At low speed, the solenoid valve at the connection end and the pressure-limiting end B allow the pressure regulating device to automatically adjust the boost pressure;at acceleration or high load, the solenoid valve is powered by the engine control unit in the form of a duty cycle, and the low-pressure end is connected to the other end. Both ends, so the pressure drop reduces the opening of the diaphragm valve and exhaust bypass valve of the boost pressure adjustment unit, increasing the boost pressure. The greater the boost pressure, the greater the duty cycle. Mechanical air recirculation valve The mechanical air recirculation valve is installed in parallel between the hose at the compressor outlet and the low-pressure intake pipe. The valve has 3 pipe joints. The two thick pipes A and B are connected to the high-pressure hose at the outlet of the supercharger compressor and the low-pressure air inlet pipe at the compressor inlet respectively. The thin pipe C recirculates the supercharger air through the vacuum pipe. Solenoid valve N249 is connected. There is a vacuum diaphragm in the valve. When the vacuum in the diaphragm chamber is small, the mechanical air recirculation valve does not open. When a large vacuum acts on the diaphragm, the valve opens and part of the pressurized air returns. Low pressure intake pipe. The above is the function of the turbine solenoid valve, and the working principle of the turbine solenoid valve is introduced. If you want to know more relevant information, please log in to www.diancifa.cc to view it.