JPS61181831U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention;
FIG. 2 is an i-s diagram for the configuration of FIG. 1. 10...Engine, 12...Exhaust pipe, 14...
Air supply pipe, 16...first supercharger, 22...second supercharger, 30...exhaust switching valve, 34...branch passage, 3
6... First supply air cooling device, 38... Second supply air cooling device, 40... Supply air switching valve.

Claims (1)

[Scope of utility model registration request] first and second turbochargers each comprising an exhaust turbine driven by engine exhaust gas and an air compressor driven by the turbine; exhaust turbines of the first and second turbochargers; an exhaust passage connected in parallel to the exhaust pipe of the engine, an exhaust switching valve provided in the exhaust passage to either one of the exhaust turbines and closed when the engine rotates at low speeds and opened when the engine rotates at high speeds; An air supply passage that connects one air compressor of the first and second turbo superchargers, the other air compressor, and an air supply pipe of the engine in series, and an air supply passage that is connected to the air supply passage between the two air compressors. A branch passage that communicates with the atmosphere, an air supply switching valve installed in the branch passage that opens when the engine rotates at low speeds and closes when the engine rotates at high speeds, and an air supply passage that connects the two air compressors. A first charge air cooling device interposed therein, and a second charge air cooling device interposed in an air supply passage between the other air compressor and the engine air supply pipe. Exhaust turbocharged engine.