Serial-parallel adjustable single-vortex double-pressure turbocharging system

Abstract

The invention discloses a serial-parallel adjustable single-vortex double-pressure turbocharging system, belonging to the technical field of internal combustion engines. The serial-parallel adjustable single-vortex double-pressure turbocharging system comprises gas inlet pipes, a gas inlet main pipe, an engine, exhaust pipes, an exhaust main pipe, a turbine, a first gas compressor, a second gas compressor, a connecting shaft, a connecting pipe and control valves, wherein the first gas compressor, the second gas compressor and the turbine are coaxially connected by the connecting shaft; a first control valve is arranged on the gas inlet pipe of the first gas compressor; a second control valve is arranged on the gas inlet pipe of the second gas compressor; a third control valve is arranged on the connecting pipe; a fourth control valve is arranged on a gas outlet pipe of the first gas compressor; a fifth control valve is arranged on a gas outlet pipe of the second gas compressor; and a low-pressure control valve is arranged on a low-pressure connecting pipe. In the serial-parallel adjustable single-vortex double-pressure turbocharging system, three working modes such as single gas compressor, parallel connection of double gas compressors and serial connection of the double gas compressors as well as exhaust recirculation under the three working modes can be realized by adjusting the opening and closing of different control valves. The serial-parallel adjustable single-vortex double-pressure turbocharging system is reasonable in design and simple in control strategy and is applicable to the turbocharging systems with various numbers of the cylinders.

Description

technical field [0001] The invention relates to a turbocharging system in the field of internal combustion engines, in particular to a series-parallel adjustable single-scroll dual-pressure turbocharging system capable of realizing compressors working in series and parallel. Background technique [0002] In the face of increasingly severe environmental and energy crises, increasing power density, reducing fuel consumption and reducing emissions have become the main directions for the development of internal combustion engines. Turbocharging is not only the most effective way to strengthen the internal combustion engine, but also achieves the purpose of reducing fuel consumption and reducing emissions at the same time, which has become an indispensable technical means of modern internal combustion engine technology. However, due to the influence of the flow characteristics of the turbocharger compressor, for the traditional single-scroll single-pressure system, the compressor...

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Problems solved by technology

[0003] After searching the existing technical literature, it is found that the Chinese patent application number is 200510025774.0, and the patent name is: large and small turbocharged series-parallel adjustable booster system. , sequential turbocharging and two-stage turbocharging, so that the range of the equivalent flow area of ​​the turbine is wider; but the flow range of the compressor is limited

Chinese patent application number 200710144757.8, patent name: adjustable sequential load turbocharging system, in the specific implementation of this patented technology, a single turbocharging, two parallel turbocharging, intake and exhaust bypassing are realized through the bypass method Turbocharging, high working condition bleed turbocharging, expands the operating range of the turbocharged diesel engine and improves the performance of the turbocharged diesel engine in the full range of working conditions; but this invention cannot adjust the relationship between the turbine and the compressor matching relationship

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