Three-turbocharger three-stage sequential turbocharging device and control method with EGR achieving function

Abstract

The invention aims at providing a three-turbocharger three-stage sequential turbocharging device with an EGR achieving function and a three-turbocharger three-stage sequential turbocharging control method with the EGR achieving function. The sequential turbocharging device comprises an exhaust header, an air-intake header, a first big turbocharger, a second big turbocharger and a small turbocharger, wherein the inlet end of a first turbine communicates with the exhaust header, the inlet end of a second turbine communicates with the exhaust header, the inlet end of a small turbine communicates with the exhaust header, and the outlet end of the first turbine, the outlet end of the second turbine and the outlet end of the small turbine all communicate with an exhaust header pipe; and the inlet end of a first air compressor, the inlet end of a second air compressor and the inlet end of a small air compressor all communicate with an air-intake header pipe, and the outlet end of the first air compressor, the outlet end of the second air compressor and the outlet end of the small air compressor all communicate with an air outlet header pipe. According to the three-turbocharger three-stage sequential turbocharging device and control method with the EGR achieving function, the effect of performing sequential turbocharging to improve the low working-condition performance of a diesel engine can be achieved, the NOx exhaust requirement of the diesel engine in an exhaust control area can be met through EGR, and the comprehensive performance of the diesel engine can be greatly improved.

Description

technical field [0001] The invention relates to a diesel exhaust gas utilization device and a control method thereof, in particular to an EGR device and a control method thereof. Background technique [0002] The traditional turbocharging technology can greatly increase the average effective pressure of the diesel engine, but at the same time it will bring certain problems. When the diesel engine is running at a low operating condition, the exhaust energy is low, and the efficiency of the turbocharger and the boost pressure are significantly reduced. Insufficient air supply, poor combustion in the cylinder, high fuel consumption rate, high exhaust temperature and deterioration of emission performance. If the selected supercharger is too small, when the diesel engine is running The speed of the compressor will be too high, which will affect the service life of the diesel engine and turbocharger. The sequential supercharging system uses two or more turbochargers. As the speed ...

AI Technical Summary

Problems solved by technology

[0002] The traditional turbocharging technology can greatly increase the average effective pressure of the diesel engine, but at the same time it will bring certain problems. When the diesel engine is running at a low operating condition, the exhaust energy is low, and the efficiency of the turbocharger and the boost pressure are significantly reduced. Insufficient air supply, poor combustion in the cylinder, high fuel consumption rate, high exhaust temperature and deterioration of emission performance. If the selected supercharger is too small, when the diesel engine is running The speed of the compressor will be too high, which will affect the service life of the diesel engine and turbocharger. The sequential supercharging system uses two or more turbochargers. As the speed and load of the supercharged engine increase, they will be put into operation in sequence. In this way, the turbocharged diesel engine can have a higher boost ratio and better economy in the entire operating range, and meet the air demand of diesel engines in different working conditions. The more successive boost stages, the smoother the switching and the more stable the work

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