Supercharged diesel engine EGR realization device based on auxiliary turbosupercharger

Abstract

The invention aims at providing a supercharged diesel engine EGR realization device based on an auxiliary turbosupercharger. The supercharged diesel engine EGR realization device comprises a main turbosupercharger and the auxiliary turbosupercharger; an exhaust manifold is divided into a main exhaust manifold part and an auxiliary exhaust manifold part; the main exhaust manifold part is connected with a turbine of the main turbosupercharger; the auxiliary exhaust manifold part is connected with a turbine inlet of the auxiliary turbosupercharger and the atmosphere; an air inlet manifold is connected with a gas compressor of the main turbosupercharger and a gas compressor of the auxiliary turbosupercharger; a gas compressor outlet of the main turbosupercharger is connected with a turbine inlet of the main turbosupercharger; and a gas compressor inlet of the auxiliary turbosupercharger is connected with a turbine outlet of the main turbosupercharger and the atmosphere. Exhausted gas at the rear part of the turbine of the main turbosupercharger can be pressurized in an EGR mode to allow the exhaust pressure of the rear part of the turbine to be higher than the intake pressure, so that EGR is realized, in the meanwhile, in a non-EGR mode, the auxiliary turbosupercharger can boost a part of air, and the quantity of fresh air in the air inlet manifold is increased.

Description

technical field [0001] The invention relates to a diesel engine device, specifically a diesel engine device with EGR. Background technique [0002] With the rapid development of human science and technology, diesel engines have attracted much attention due to their advantages in thermal efficiency, economy, reliability, etc., and have been widely used in automobiles, ships, railways, power generation equipment and other fields. Although the use of diesel engines has greatly promoted the development and progress of society, it will also bring a series of problems such as environmental pollution during use. Among them, NOx is one of the main harmful pollutants, which can cause great harm to the human body. The main factors affecting the formation of NOx are: the combustion temperature, the oxygen concentration, and the residence time of combustion products. Currently used in diesel engines, measures to reduce NOx generation mainly include: exhaust gas recirculation system (E...

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Problems solved by technology

For a supercharged diesel engine, the intake pressure of the diesel engine is higher than the exhaust pressure, so that the exhaust gas cannot be spontaneously introduced from the exhaust manifold to the intake manifold. At the same time, the use of the EGR device will cause pressure fluctuations in the exhaust manifold. In addition, the realization of EGR under low working conditions may cause the turbocharger compressor to surge. When the diesel engine is 100% loaded or even overloaded without EGR, it may also cause the turbocharger to overspeed, affecting the turbocharger. service life

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