Device and method for controlling surging prediction of sequential turbocharging system

Abstract

The invention provides a device and a method for controlling surging prediction of a sequential turbocharging system. The device comprises a dynamic pressure sensor, a revolution speed sensor, an air flowmeter, a deflation valve and a surging prediction controller, wherein the air flowmeter and the pressure sensor are respectively arranged at an inlet and an outlet of a gas compressor; the revolution speed sensor is arranged on one side of the gas compressor; the deflation valve is arranged at the outlet of the gas compressor; turbocharging pressure, the revolution speed of a turbocharger and real-time data of air quality and flow parameters are acquired and stored by a data acquiring module, and are transmitted to a prediction preprocessing module; parameter data are transmitted to a grey prediction module and are subjected to grey prediction; a prediction result and actual measurement surging prediction data information are compared to judge whether surging occurs or not; and commands are sent out to adjust the opening of the deflation valve. By the device and the method, a surging phenomenon can be predicted and controlled in an on-line manner quickly and accurately, and the hysteresis of prevention measures is eliminated.

Description

technical field [0001] The invention relates to a supercharged diesel engine device and a control method thereof. Background technique [0002] Sequential supercharging technology is an effective measure to improve the performance of supercharged diesel engines in low working conditions. It can effectively expand the operating range of diesel engines, improve its economy, and improve emission performance. When a sudden sudden stall is formed, the flow condition in the flow channel will be greatly deteriorated, and periodic axial low-frequency and large-amplitude gas oscillations will appear in the entire pressurized system, that is, the surge phenomenon of the compressor. The occurrence of surge hinders the normal operation of the supercharger, which greatly increases the stress of the impeller, increases the noise, and may damage the bearing and seal, causing parking or serious accidents. Therefore, how to effectively prevent the occurrence of surge phenomenon is an import...

AI Technical Summary

Problems solved by technology

For example, the patent No. "201220321847.6" of the "Sequential Supercharging Section Structure of Diesel Engine" avoids the phenomenon of zero flow rate of the compressor by setting the air release valve on the controlled supercharger, thereby eliminating the surge phenomenon of the supercharger, but This patent cannot realize the control function and forecast function

The patent number is "200910073152.3" for the "sequential supercharging system anti-surge control device and control method" patent. By collecting the signals of each sensor, the measured operating point information and the set control line are compared and analyzed to determine whether there is Surge precursor, and issued instructions to adjust the air circulation valve and air bypass valve, this patent aims to improve the surge phenomenon that occurs during the switching process of successive supercharging systems, and the preventive measures have a certain hysteresis

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