Supercharging mode-variable turbocharging system with turbo in the middle part

Abstract

The invention discloses a turbocharging system capable of changing charging modes when a turbine is placed centrally, and belongs to the technical field of internal-combustion engines. The turbocharging system comprises an air cylinder, an exhaust branch, exhaust pipes, a turbine, a connecting pipe and a valve, wherein one end of the connecting pipe is connected with a tail end of a first exhaust pipe, while the other end is connected with a second exhaust pipe at a position close to turbine. A first valve is arranged at a connection part of the first exhaust pipe and the connecting pipe, and a second valve is arranged in the connecting pipe close to the second exhaust pipe. When the two valves both close, the charging mode of the engine is pulse pressure-charging which has good performance during lowlaod and transient operating conditions of the engine; and when the both of the two valves open, the charging mode of the engine is quasi-steady pressure charging. Therefore, the high-load performance of the engine can be improved. The turbocharging system is reasonable in design, simple in structure, free from limitation of the number of cylinders and suitable for turbocharging device with two centrally placed turbines at a turbine inlet.

Description

technical field [0001] The invention relates to a turbocharging system of an internal combustion engine, in particular to a turbocharging system with a variable supercharging mode when the turbine is placed in the middle, and belongs to the technical field of internal combustion engines. Background technique [0002] With the development of society and the improvement of environmental protection requirements, engine boosting technology is now more and more widely used. Most of the medium and high-power engines use turbocharging technology to increase power and reduce fuel consumption. The two basic supercharging systems for turbocharged engines are constant pressure supercharging system and pulse supercharging system. The structural feature of the constant pressure booster system is that the volume of the exhaust pipe is large, the exhaust pipe plays a role in stabilizing the pressure, the fluctuation of the exhaust pressure is small, the flow through the turbine is stable, ...

AI Technical Summary

Problems solved by technology

The volume of the exhaust pipe of the pulse supercharging system is small, the entropy increase of the exhaust gas from the exhaust valve to the turbine inlet is small, the exhaust energy utilization rate is high, and the load change can be reflected in time, and the response speed is fast; However, because the turbine is pulsating intake air, resulting in low turbine efficiency, the pulse supercharging system is beneficial for low load and transient conditions

It can be seen that if an engine is equipped with constant pressure supercharging method and pulse supercharging method at the same time, the constant pressure supercharging system is used at high load, and the pulse supercharging system is used at low load and transient working conditions, which is more ideal. Yes, but the volume of the exhaust pipe of the existing engine supercharging system cannot be adjusted

In the existing technology, the patent number is ZL 200410050996.3, which is named as an invention patent of a variable modular pulse conversion supercharging system for a turbocharged diesel engine. In its second and third embodiments, when the load is low At this time, the exhaust interference of each cylinder is very large, resulting in increased pumping loss; when the load is high, the quasi-constant pressure supercharging system of the present invention cannot be formed, resulting in low turbine efficiency; become more complicated

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