Diesel engine sequential supercharging system and control method with slow start function

Abstract

The invention aims to provide a diesel engine successive supercharging system with a slow starting function and a control method. A diesel engine, an exhaust manifold, a basic supercharger, a controlled supercharger and a gas inflow filter are included; a turbine of the basic supercharger communicates with the exhaust manifold; an outlet of the gas inflow filter communicates with an inlet of a controlled supercharger gas compressor through a controlled gas compressor inlet pipe; an outlet of the controlled supercharger gas compressor communicates with a controlled gas compressor outlet pipe; the controlled gas compressor outlet pipe, a basic supercharger gas compressor outlet and an intercooler communicate with one another in a three-way manner; a turbine of the controlled gas superchargercommunicates with the exhaust manifold through a controlled turbine outlet pipe; and a basic supercharger turbine outlet, a controlled supercharger turbine outlet and atmosphere communicate with oneanother in a three-way manner. According to the diesel engine successive supercharging system with the slow starting function and the control method, the controlled supercharger is free of surging when being started and stopped, so that the diesel engine gas inflow pressure fluctuation is small, the diesel engine transient process is improved, and stable running of an engine is facilitated.

Description

technical field [0001] The invention relates to a diesel engine system and a control method, in particular to a diesel engine camera pressurization system and a control method. 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 conventional sequential supercharging system of the diesel engine, when...

AI Technical Summary

Problems solved by technology

[0003] During the operation of the conventional sequential supercharging system of a diesel engine, when the controlled supercharger is started, the gas valve is opened first and the air valve is opened later, which will lead to zero flow when the supercharger compressor rotates at high speed, and deep surge occurs

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 outlet of the compressor has been blocked by the air valve, that is, the compressed air The phenomenon of zero flow when the compressor has a rotating speed will inevitably cause severe surge phenomenon, which will inevitably cause mechanical damage to the compressor

Images