Staged double-circulation cooling system of two-stage supercharged engine

Abstract

The invention relates to a staged double-circulation cooling system of a two-stage supercharged engine, and belongs to the technical field of automobile engines. The staged double-circulation cooling system of the two-stage supercharged engine comprises an engine provided with an air inlet pipeline connected with an air inlet manifold and an exhaust pipeline connected with an exhaust manifold, a high-pressure-stage supercharger, a low-pressure-stage supercharger, an air inlet intercooler and an interstage intercooler; the high-pressure-stage supercharger comprises a high-pressure-stage turbine communicating with the exhaust pipeline and a high-pressure-stage gas compressor which ; the low-pressure-stage supercharger comprises a low-pressure-stage turbine communicating with the high-pressure-stage turbine and a low-pressure-stage gas compressor; the air inlet intercooler communicates with the high-pressure-stage gas compressor; and the interstage intercooler communicates with the low-pressure-stage gas compressor, and the interstage intercooler cools compressed gas of the low-pressure-stage gas compressor and then inputs the cooled compressed gas into the gas inlet intercooler. Compressed air exhausted by the low-pressure-stage gas compressor sequentially passes through the interstage intercooler and the air inlet intercooler to be cooled, then enters the high-pressure-stage gas compressor to be compressed again and then is secondarily cooled through the air inlet intercooler, and the gas inlet temperature of the engine is greatly reduced.

Description

technical field [0001] The present application relates to the technical field of automobile engines, in particular to a staged dual-circulation cooling system for a two-stage supercharged engine. Background technique [0002] In recent years, a two-stage supercharging type exhaust turbocharger has been adopted in a vehicle diesel engine, which is configured by arranging a high-pressure stage supercharger and a low-pressure stage supercharger in series on the flow path of the exhaust gas. The low-pressure compressor of the low-pressure stage supercharger performs the first-stage pressurized intake air, and the high-pressure compressor of the high-pressure stage supercharger performs the second-stage pressurization and supplies it to the engine, wherein the high-pressure stage The supercharger has a high-pressure turbine driven by exhaust gas discharged from the engine, and the low-pressure stage supercharger has a low-pressure turbine driven by exhaust gas after driving the h...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present application provides a staged double-circulation cooling system for a two-stage supercharged engine to solve the problem of the limited cooling capacity of the inter-stage intercooler in the related art, resulting in adverse effects on the intake air volume, air-fuel ratio and fuel consumption of the engine

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