Method for judging rotating speed of exhaust gas turbocharger

Abstract

The invention belongs to the technical field of control, and particularly relates to a method for judging the rotating speed of an exhaust gas turbocharger. According to the method for judging the rotating speed of the exhaust gas turbocharger, the turbocharger adopts a Hall type rotating speed sensor, the Hall sensor sends a voltage signal to a diesel engine controller; according to the queried real-time intake supercharging pressure of the diesel engine, a rotating speed curve of the exhaust gas turbocharger is queried, and the rotating speed of the target exhaust gas turbocharger is obtained; the controller calculates and compares the inquired rotating speed of the exhaust gas turbocharger with the rotating speed of the turbocharger input by the rotating speed sensor, and judges whether the rotating speed of the turbocharger is in a target interval or not by integrating a gas inlet pressure comparison result; and after the rotating speed of the supercharger is reduced to the target interval, the controller outputs a control signal to an electric control waste gas bypass valve to control the waste gas bypass valve to be closed, and it is guaranteed that the rotating speed of the supercharger is stabilized within the matching range of the current working condition.

Description

technical field [0001] The invention belongs to the technical field of control, and in particular relates to a method for judging the rotational speed of an exhaust gas turbocharger. Background technique [0002] Exhaust gas turbocharger is one of the important components for diesel engine power improvement. The exhaust gas from each cylinder of the diesel engine is collected by the exhaust manifold and then enters the turbine housing of the exhaust gas turbocharger. The exhaust gas drives the turbine to rotate at high speed and drives the coaxial compressor. Compress the intake air, thereby increasing the intake air volume, and the compressed air enters the cylinder of the diesel engine to burn and do work, so as to increase the power of the diesel engine. [0003] The exhaust gas turbocharger must match the working conditions of the diesel engine. If the speed of the turbocharger exceeds the allowable range matching the power output of the diesel engine, it will affect the...

AI Technical Summary

Problems solved by technology

[0004] The turbocharger speed measurement of a certain type of diesel engine uses a magnetic rod speed sensor. It is necessary to magnetize the compressor impeller of the supercharger in advance. The magnetic impeller cuts the magnetic force line of the speed sensor to generate a frequency signal and displays it through the tachometer. This method is anti-electromagnetic The interference ability is poor, the signal display is inaccurate after the magnetic force weakens, and the speed signal can only be displayed, and the control system cannot be read, and there are defects such as failure judgment and speed control that cannot be comprehensively integrated with the diesel engine working conditions

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