Automatic adjustment method of exhaust back pressure for engine bench test and its adjustment system

Abstract

The invention discloses an exhaust back pressure automatic adjusting method for an engine bench test and a regulating system thereof. An existing traditional method for regulating the exhaust back pressure of the engine bench has low precision. The automatic adjusting method comprises the steps of performing feedback of an exhaust back pressure of the engine to a fuzzy adaptive PID controller by an exhaust pressure sensor; performing feedback of an engine rotating speed and a load to the fuzzy adaptive PID controller by a dynamometer; wherein an electric throttle valve is fixed to a position,which is next to the output end, of an exhaust pipe, the air inlet of a vortex blower is connected with an output opening of the exhaust pipe, and controlling the opening degree of the electric throttle valve and starting and stopping and the rotating speed of the vortex blower by the fuzzy adaptive PID controller. According to the automatic adjusting method and the system thereof, through adjusting the electric throttle valve opening degree and the rotating speed of the vortex blower by the controller, accurate control to the exhaust back pressure of the engine bench test is realized. The exhaust back pressure automatic adjusting method and the regulating system can be used for simulating the exhaust back pressure of the whole vehicle system for improving accuracy and reliability of the bench test and furthermore can be used for researching the influence of different exhaust back pressure to various performance of the engine.

Description

technical field [0001] The invention belongs to the application field of engine engineering, and in particular relates to an automatic adjustment method of exhaust back pressure for an engine bench test and an adjustment system thereof. The engine bench is realized by adjusting the opening degree of an electric throttle valve and the speed of a vortex fan by a controller. The precise control of the test exhaust back pressure can not only be used to simulate the exhaust back pressure of the vehicle system, improve the accuracy and reliability of the bench test, but also can be used to study the influence of different exhaust back pressure on the performance of the engine. Background technique [0002] In the development process of the engine exhaust system, the exhaust back pressure has an important impact on the economy, power and sound quality of the engine, and is one of the important indicators to measure the performance of the engine in the development and design process....

AI Technical Summary

Problems solved by technology

This method is mostly manually adjusted, which has disadvantages such as low control accuracy and long feedback time. At the same time, the adjustment range of this method is narrow. If the throttle valve is fully opened, but the measured exhaust back pressure is still greater than the expected back pressure, it will not pass. This method effectively regulates

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