Module type pulse conversion turbocharging system with scaling type exhaust pipe

Abstract

The invention relates to a module type pulse conversion turbocharging system with a scaling-type exhaust branch pipe and belongs to the technical field of internal combustion engine. The module type pulse conversion turbocharging system comprises a cylinder, an exhaust branch pipe, an exhaust pipe and a turbine; and the exhaust branch pipe consists of a gradually reducing pipe with gradually reducing sectional area and a gradually increasing pipe with gradually enlarging sectional area in smooth connection. When the engine runs in low load, the exhaust pressure in the gradually reducing pipe can be rapidly risen as the exhaust branch pipe necks down in advance in order to reduce the restriction loss of an exhaust valve and improve the low-load performance of the engine; when the engine runs in high load, the turbocharging system is wholly changed into a module type pulse conversion supercharging system; and the engine has good performance of high load. The module type pulse conversion turbocharging system has the advantages that the module type pulse conversion turbocharging system has reasonable design and a simple structure, can improve the low-load performance of the engine and is suitable for the turbocharging system the turbine of which is provided with a single inlet and laterally arranged.

Description

technical field [0001] The invention relates to a turbocharging system of an internal combustion engine, in particular to a modular pulse conversion turbocharging system in which the turbine is a single inlet and the exhaust branch pipe on the side of the turbine is a scaling type, and belongs to the technical field of the internal combustion engine. 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 exh...

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

The modular pulse conversion supercharging system combines the advantages of the pulse supercharging system and the constant pressure supercharging system, but the low-load performance of this supercharging system is very poor, and when it is applied to some engines, it will make some cylinder heads Temperature is too high

In the existing technology, the patent number is 97242566.7, which is called the hybrid pulse converter exhaust system utility model patent, which solves the problem that the temperature of some cylinder heads is too high when the engine adopts a modular pulse converter supercharging system, but the low Load performance is still not very good

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