Sequential turbocharging system anti-surge control device and control method

Abstract

The invention provides a sequential turbocharging system anti-surge control device and a control method. The sequential turbocharging system anti-surge control device is composed of a diesel engine speed transducer, a turbo-charger speed transducer, a pressure pickup, an air flowmeter, an air valve, a gas valve, an air circulating valve, an air bypass valve, an air circulating pipeline, an air bypass pipeline, a signal conditioning module, a signal acquiring module, a signal processing module, a storing module, an electromagnetic module and a valve driving device. The method is as follows: acquiring signals of each sensor by a control device; judging whether the interval time of the opening of the gas valve and the air valve is in the allowable range; comparing the detected operation point information with a set control line to obtain whether a surge indication exists or not, and giving corresponding instruction to regulate the air circulating valve and the air bypass valve. The invention can greatly reduce surge events taking place in the process of diesel engine sequential turbocharging system conversion, prolonging the service lift of the turbo-charger and improving transient performance of the diesel engine sequential turbocharging system in conversion process.

Description

technical field [0001] The invention relates to the turbocharging technology of diesel engines, in particular to the anti-surge technology of successive turbocharging systems of diesel engines. Background technique [0002] One of the most effective means to increase the power per liter of a diesel engine is to increase the supercharging degree. However, as the boost ratio increases, the matching contradiction between the turbocharger and the diesel engine becomes more prominent. The turbocharger cannot meet the needs of the diesel engine in all working conditions, resulting in insufficient partial load torque and increased heat load. Some special supercharging systems have been developed to improve the low-load performance of highly supercharged diesel engines, and the sequential supercharging system is one of them. Its basic working principle is to adopt a plurality of small turbochargers, which are put into operation sequentially with the improvement of the working condi...

AI Technical Summary

Problems solved by technology

For the sequential pressurization system, opening the gas valve and air valve at a reasonable time can avoid compressor surge, but in many cases, the control of the delay time between the gas valve and air valve is affected by too many factors, such as Control the pressure of the air and its fluctuations, the friction of the cylinder of the pneumatic valve body, the volume and length of the air pipeline, etc. These factors may cause the air valve to not open on time, and sometimes the surge phenomenon will occur

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