Diesel engine sequential supercharging structure and control method thereof

Abstract

The invention aims to provide a diesel engine sequential supercharging structure and a control method thereof. The diesel engine sequential supercharging structure comprises a diesel engine, air inlet pipes, exhaust pipes, turbochargers, an air vent valve, an air valve and a gas valve, the turbochargers comprises a basic turbocharger and a controlled turbocharger; the air inlet pipes comprise an A column of air inlet pipes, a B column of air inlet pipes, a compressor connected with the basic turbocharger and a compressor connected with the controlled turbocharger; the exhaust pipes comprise an A column of exhaust pipes, a B column of exhaust pipes, a turbine connected with the basic turbocharger and a turbine connected with the controlled turbocharger; the A column of exhaust pipes and the B column of exhaust pipes are communicated through exhaust connecting pipes; the gas valve is installed on the B column of exhaust pipes; the air valve and the air vent valve are installed on the B column of air inlet pipes; and the air vent valve is located between the air valve and the compressor of the controlled turbocharger. According to the invention, a phenomenon of zero flow with non-zero rotating speed of the compressor can be avoided; surge phenomenon of the superchargers can be eliminated; and usage conditions of the supercharger are improved effectively.

Description

technical field [0001] The invention relates to a diesel engine, in particular to a camera supercharged diesel engine. Background technique [0002] Sequential supercharging technology is the first technology adopted by German MTU company. Its design is mainly to expand the working range of low compression ratio and high supercharged engines, increase the low-speed torque of the engine and reduce the fuel consumption rate during partial load operation. Its basic principle is to use multiple turbochargers, which are put into operation in sequence with the increase of engine speed and load, so as to ensure that the working turbochargers always operate in the high-efficiency area, so that the engine's The fuel consumption rate is low in the entire operating area, and the low-speed high-torque performance is good. [0003] During the operation of the diesel engine sequential supercharging system, when the controlled supercharger is out of operation, that is, when the gas valve ...

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Problems solved by technology

[0003] During the operation of the diesel engine sequential supercharging system, when the controlled supercharger is out of operation, that is, when the gas valve and the air valve are closed, due to the influence of the moment of inertia, the controlled supercharger must have a certain speed, and at this time the compressed air The outlet of the compressor has been blocked by the air valve, that is, the compressor has a zero flow phenomenon under the condition of rotating speed, which will inevitably cause severe surge phenomenon, which will inevitably cause mechanical damage to the compressor

[0004] At present, the existing diesel engine sequential supercharging structure does not have a vent valve at the outlet of the controlled supercharger compressor, which will cause certain damage to the controlled supercharger during use.

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