Level-variable turbocharging system and engine with same

Abstract

An engine with a level-variable turbocharging system comprises an engine body (1) and the level-variable turbocharging system, wherein the engine body (1) comprises an engine mechanical assembly and an engine electric control unit; the level-variable turbocharging system comprises a large turbocharger (21), a middle turbocharger (22) and a small turbocharger (23) which are different in flow, each of the turbochargers comprises a turbine and an air compressor which form a network with an air pipe through a tee joint (312), a tee joint (322), a tee joint (331), a tee joint (342), a tee joint (381), a tee joint (412), a tee joint (422), a tee joint (441), a tee joint (451), a three-way valve (311), a three-way valve (321), a three-way valve (341), a three-way valve (351), a three-way valve (411), a three-way valve (421) and a three-way valve (461), and connected with the engine body (1).

Description

technical field [0001] The invention relates to engine and engine turbocharger technology, in particular to a variable-stage turbocharger system and an engine with a variable-stage turbocharger system. Background technique [0002] In order to reduce greenhouse gas emissions, the state vigorously advocates energy conservation and emission reduction. Engine exhaust emissions have become an important source of greenhouse gas emissions. Engine exhaust emissions are mainly automobile engine exhaust emissions, because in recent years, the production and sales of automobiles have risen sharply. On the other hand, for automobile engines, users are increasingly demanding that the engine has a relatively large power per liter, good acceleration, and a good driving experience. In order to solve the problems of environmental protection and power of the above-mentioned engines (that is, the environmental protection performance and power performance of the engine), people have added a ...

AI Technical Summary

Problems solved by technology

[0003] On the basis of one-stage turbocharging, a two-stage turbocharging system has appeared on the engine. The current two-stage supercharging system is composed of two large and small turbochargers connected in series or in parallel, although it can improve engine acceleration. , compressor and turbine flow range, supercharging system efficiency, but the degree of improvement is limited, the ratio of exhaust gas recirculation and the range of operating conditions that it can achieve are also limited, and the effects of boost pressure ratio and acceleration response provided are not good. It is very ideal, but it cannot take into account the high and low speed performance of the engine, so that the low speed, medium and low speed and small load, medium and small load performance and high speed performance of the engine are not very ideal. In practice, it is difficult to achieve stable performance on plateaus and plains.

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