Waste gas bypass valve of turbocharger

Abstract

The invention discloses a waste gas bypass valve of a turbocharger. The waste gas bypass valve is provided with a bypass flow channel and a valve element, a gas inlet and a gas outlet of a turbine are communicated through the bypass flow channel, and the valve element is used for opening or closing the opening part of the bypass flow channel. The valve element comprises a valve rod part and a valve plate part connected to the valve rod part, the valve rod part can axially move so that the valve plate part can be driven to horizontally move along the end face of the opening part of the bypass flow channel, and the end face of the opening part is opened or closed through the valve plate part. The waste gas bypass valve can improve control precision of an engine under various load work conditions, and enhance sealing performance of the waste gas bypass valve of the engine under a high load.

Description

technical field [0001] The invention relates to an engine turbocharger system, in particular to a waste gas bypass valve for a turbocharger. Background technique [0002] The basic function of the supercharger wastegate valve is to adjust the bypass waste gas flow of the supercharger turbine, so as to realize the control and adjustment of the air mass flow rate and the intake and exhaust pressure of the supercharger and even the whole engine, so as to ensure the safety and stability of the engine work; since the exhaust gas is the working medium of the engine, the wastegate valve not only regulates the exhaust gas, but also regulates the intake and exhaust pressure of the engine to maintain the best possible fuel economy and avoid the exhaust gas acting on the components. Uncomfortable rattling noises. [0003] see figure 1 , the current exhaust gas turbocharged internal combustion engine includes an engine body 1, a compressor 2, a wastegate valve 3, a turbine 4, and a ca...

AI Technical Summary

Problems solved by technology

[0006] 1. When the engine is cold started, the default state of the wastegate valve 3 is closed, and the engine exhaust gas cannot be discharged through the passage of the wastegate valve 3, but can only flow into the downstream catalytic converter through the turbine 4, because the turbine 4 will absorb the heat of the exhaust gas , the temperature of the exhaust gas entering the catalytic converter 5 will be cooled by the turbine 4, and the medium in the catalytic converter 5 cannot quickly heat up to the working temperature to play a catalytic role, so the engine emits more pollutants when starting a cold engine;

[0007] 2. When the engine is working at a low load, the control pressure of the positive pressure actuator 33 is relatively low, which is not enough to push the valve cover 32 of the cover valve, and the exhaust gas cannot be discharged through the bypass valve flow path 31, but can only pass through the turbine flow path Flow to the catalytic converter 5, so the airway air pressure between the engine body and the turbocharger turbine 4 is relatively high, which is not conducive to the smooth discharge of exhaust gas by the engine, so the engine will consume an additional part of its working power for exhaust, which deteriorates fuel economy;

At the same time, the exhaust gas pulse acts on the valve face of the cover valve, which will additionally increase or decrease the valve cover stroke

Due to the above two reasons, the bypass valve is not stable enough to control the air flow;

[0009] 4. When the engine is working under high load, the exhaust gas pressure is relatively high. Since the travel direction of the cover valve bonnet 32 ​​is the same as that of the exhaust gas pressure, the bonnet is pushed by the exhaust gas, which may easily cause it to close the wastegate valve passage 31 laxly. reduced engine performance

At the same time, the intermittent exhaust of the engine body 1 leads to dynamic fluctuations in the exhaust gas pressure, and the valve cover 32 of the cover plate valve is easily shaken by the action, forming abnormal noise

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