Two-level turbocharging system and engine with two-level turbocharging system

Abstract

The invention discloses an engine with a two-level turbocharging system. The engine with the two-level turbocharging system comprises the engine (1) and the two-level turbocharging system. The engine (1) comprises an engine mechanical assembly and an engine electronic control unit. The two-level turbocharging system comprises a large turbocharger (21), a medium turbocharger (22) and a small turbocharger (23) which are different in flows. The medium turbocharger (22) is in parallel connection with an exhaust gas end and an air inlet end of the small turbocharger (23) respectively through air pipes and then in series connection with the large turbocharger (21) or the engine (1). The two-level turbocharging system can achieve three two-stage supercharging states and can provide a wider compressor and turbine flow range and achieve higher volume power, consideration is given to higher low-speed torque, higher supercharge pressure with medium and low rotating speeds is provided, large torque, low oil consumption and low emission are achieved, and the engine acceleration responsiveness and discharging and plateau adaptability are better.

Description

technical field [0001] The invention relates to an engine and its accessories, in particular to a two-stage turbocharging system and an engine with a two-stage turbocharging 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 turbocharging system...

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. , the flow range of the compressor and turbine, and the efficiency of the supercharging system, but the degree of improvement is limited. The range of conditions is also limited, and the high and low speed performance of the engine cannot be well taken into account. At the same time, it is difficult to achieve the effect of stable performance on plateaus and plains.

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