Multi-mode large and small turbocharger diesel engine sequential supercharging structure

Abstract

The invention aims at providing a multi-mode large and small turbocharger diesel engine sequential supercharging structure which comprises a small supercharger and a large supercharger, wherein a turbine of the small supercharger is communicated with an exhaust port of a diesel engine through an A row exhaust pipe, a turbine of the large supercharger is communicated with the exhaust port of the diesel engine through a B row exhaust pipe, a gas compressor of the small supercharger is communicated with an intercooler through an A row inlet pipe, a gas compressor of the large supercharger is communicated with the intercooler through a B row inlet pipe, the A row exhaust pipe and the B row exhaust pipe are communicated through an exhaust communication pipe, a first gas valve is arranged between the joint of the exhaust communication pipe and the A row exhaust pipe and the turbine of the small supercharger, a second gas valve is arranged between the joint of the exhaust communication pipe and the B row exhaust pipe and the turbine of the large supercharger, a first air valve is arranged on the A row inlet pipe, and a second air valve is arranged on the B row inlet pipe. The multi-mode large and small turbocharger diesel engine sequential supercharging structure enables the diesel engine to be switched into a non-supercharging mode at idle speed, and improves air inlet efficiency at the idle speed.

Description

technical field [0001] The invention relates to a diesel engine, in particular to a supercharging structure of the diesel engine. Background technique [0002] Sequential supercharging technology is the technology first adopted by German MTU company in the late 1970s. Its design is mainly to expand the working range of low compression ratio and high supercharging engine, increase the low-speed torque of the engine and reduce the part-load running time. Fuel consumption. Its basic principle is to use multiple turbochargers, which are sequentially put into operation as the engine speed and load increase, so as to ensure that the working turbochargers are always running in the high-efficiency zone, so that the engine's The fuel consumption rate is low throughout the operating range, and the low-speed high-torque performance is good. Its principle is similar to the variable section turbine, but it is different. The sequential supercharging system not only changes the area of ​...

AI Technical Summary

Problems solved by technology

However, none of these three patents involves improving the idling performance of a supercharged diesel engine

Images