Turbo-charging apparatus for vehicle engine

Abstract

The disclosure provides a turbo-charging apparatus for a vehicle engine, which includes a first and second turbocharger, an inter-turbine passage connecting a discharging port of a first turbocharger turbine with an introducing port of a second turbocharger turbine, a bypass passage connecting an introducing passage of the first turbocharger turbine with the inter-turbine passage, and a control valve for opening and closing the bypass passage. The inter-turbine passage extends substantially straight from the discharging port of the first turbocharger turbine toward the second turbocharger when viewed from a direction parallel to turbine shafts of the first and second turbochargers, which are arranged substantially parallel to each other, so that the inter-turbine passage connects with an outer circumferential part of the second turbocharger turbine so as to extend in a direction tangent to an outer circumference direction of the second turbocharger turbine.

Description

technical field [0001] The present invention relates to a turbocharger for a vehicle engine, and more particularly to a turbocharger for a vehicle engine including a first turbocharger and a second turbocharger arranged in series with the first turbocharger. Background technique [0002] In the past, it is known that in a diesel engine, by reducing the compression ratio of the compression stroke, the mechanical resistance of each bearing portion can be reduced to achieve the purpose of improving fuel economy. In addition, due to the reduction of the compression ratio, the combustion temperature can be reduced and thus Reduce NO contained in exhaust gas x . However, reducing the compression ratio as described above leads to a reduction in engine output. Therefore, as an effective means for reducing the compression ratio and reducing the output power of the engine, a turbocharger that uses the kinetic energy of the exhaust gas discharged from the engine to supercharge the in...

AI Technical Summary

Problems solved by technology

However, since the inter-turbine passage for connecting the discharge portion of the small turbocharger turbine to the inlet portion of the large supercharger turbine is arranged above the small turbocharger turbine by bypassing the small turbocharger turbine, The passage between the turbines is basically formed in a U-shape, and there is a possibility that the passage length may become longer

In this way, when the passage between the turbines is long, the heat energy of the exhaust gas will be released to the outside air, and problems such as a decrease in supercharging efficiency due to a decrease in exhaust kinetic energy, a decrease in DPF regeneration efficiency, and a delay in catalyst activation are worrisome.

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