Two-stage sequential turbocharging system used for internal combustion engine and internal combustion engine

Abstract

The invention provides a two-stage sequential turbocharging system used for an internal combustion engine and the internal combustion engine. The two-stage sequential turbocharging system used for the internal combustion engine comprises a first turbocharger set and a second turbocharger set, wherein the first turbocharger set and the second turbocharger set are connected in parallel and constitute a sequential turbocharging structure. The first turbocharger set comprises a first high-pressure stage gas compressor, a first low-pressure stage gas compressor, a first high-pressure stage turbine and a first low-pressure stage turbine, wherein the first high-pressure stage gas compressor and the first low-pressure stage gas compressor are connected in series, and the first high-pressure stage turbine and the first low-pressure stage turbine are connected in series. The internal combustion engine comprises an air cylinder, an exhaust pipe, an air inlet pipe and the two-stage sequential turbocharging system, and the exhaust pipe and the air inlet pipe are connected to the air cylinder. According to the two-stage sequential turbocharging system used for the internal combustion engine, high pressurized air can be supplied to the internal combustion engine, the power density and the operating range of the internal combustion engine are improved, and the lower-load performance of the internal combustion engine can be improved; in addition, the all-working-condition adjustment of the pressurized air can be achieved by adjusting a valve, so that the turbocharging system and the internal combustion engine are capable of operating efficiently within an all-working-condition range.

Description

technical field [0001] The invention relates to a supercharging system in the field of internal combustion engines, in particular to a two-stage sequential supercharging system for an internal combustion engine and an internal combustion engine with the two-stage sequential supercharging system. Background technique [0002] The two-stage supercharging technology is applied with its higher supercharging ratio, which can greatly increase the power density of the internal combustion engine, and can be combined with strong Miller, exhaust gas recirculation EGR (Exhaust Gas Recirculation) and other technologies to improve the economy and thermal load of diesel engines. and emission characteristics, but the two-stage supercharger technology has the problems of insufficient boost pressure and insufficient intake air volume at low loads, and it is difficult to balance the performance of the internal combustion engine under high and low conditions. Sequential supercharging is a tech...

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Problems solved by technology

[0004] The supercharging system that combines the two supercharging technologies of sequential supercharging and two-stage supercharging has also been applied. Chinese patent CN204357554U proposes a switchable sequential / two-stage supercharging structure, which combines the two supercharging and two-stage supercharging The pressure structure is combined through modification to realize the switch between the two-stage supercharging system and the sequential supercharging system. However, because there are only two turbochargers, they can at most form a group of two-stage supercharging structures, which cannot be operated by an internal combustion engine. Simultaneously realize two-stage supercharging and sequential supercharging under all working conditions

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