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A Diesel Engine Electronically Controlled Speed ​​Regulation and Testing Method Based on Fuzzy Variable Structure

A technology of diesel engine and speed regulation method, which is applied in the direction of engine control, machine/engine, governor, etc., and can solve problems such as chattering, system stability hazards, and inability to accurately determine equivalent control

Active Publication Date: 2020-09-01
HANGZHOU DIANZI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this method is that when the state trajectory reaches the sliding surface, it is difficult to strictly slide along the sliding surface toward the equilibrium point, but crosses back and forth on both sides of the sliding surface, resulting in chattering, which has a negative impact on the stability of the system. great harm
For this reason, this paper applies adaptive fuzzy control to diesel engine speed regulation, and uses adaptive fuzzy sliding mode control to approximate the sliding mode surface in sliding mode control for equivalent control to solve the problem of inaccurate control due to the existence of uncertainty and interference. Problems with Determining Equivalent Controls

Method used

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  • A Diesel Engine Electronically Controlled Speed ​​Regulation and Testing Method Based on Fuzzy Variable Structure
  • A Diesel Engine Electronically Controlled Speed ​​Regulation and Testing Method Based on Fuzzy Variable Structure
  • A Diesel Engine Electronically Controlled Speed ​​Regulation and Testing Method Based on Fuzzy Variable Structure

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Embodiment Construction

[0070] like figure 1 As shown, a diesel engine electronic control speed regulation method based on fuzzy variable structure, including the following steps:

[0071] (1) Using the actual 4135 diesel engine as the research object, under the condition that the fuel injection advance angle remains unchanged, the Hall effect speed sensor is used to measure the engine speed, and the Hall effect pressure sensor and position sensor measure the fuel injection volume, The mathematical model of the nonlinear engine speed control system is established based on torque and other data.

[0072] Through the parameters collected by the sensor, the time constant T is introduced a =12.1s, channel amplification factor K η =93.8, the pure lag time of the model τ=0.037s. The oil pressure (kPa) of the rated fuel injection quantity given multiple times is Q mt =27.5; 28.62; 30; 31.12; 32.24; 33.33; 6 measurements in total. Then the transfer function of the diesel engine mathematical model is:

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Abstract

The invention provides a diesel engine electronic-control speed adjusting and testing method based on a fuzzy variable structure. An electronic-control speed adjusting system algorithm of a diesel engine is optimally designed. A nonlinear object dynamic model and an executer of the diesel engine are subjected to modeling, and a diesel spraying system of the diesel engine is controlled through thefuzzy variable structure; then discontinuous control conditions are deduced through the Lyapunov function, and it is proved that a system has the capacity of stability adaptive adjusting under uncertain interference; and finally, the diesel engine speed-adjusting system is subjected to a Matlab / Simulink simulation experiment. Control over accuracy of the rotating speed of the diesel engine by thediesel engine electronic-control speed adjusting system can be improved to a great extent under the uncertain interference, and the good effect under various uncertain interference backgrounds such asstarting, idling, working condition sudden increasing and reducing is achieved so that the method can meet the situation that the good control effect is achieved on the diesel engine in the practicalworking process.

Description

technical field [0001] The invention belongs to the technical field of automatic control, and in particular relates to an electronically controlled speed regulation and testing method of a diesel engine based on fuzzy variable structure. Background technique [0002] Diesel engines are mostly used in large-scale industrial equipment such as ships, heavy industries, and generator sets. They are characterized by large output torque, high thermal efficiency, and fewer failures. However, with the wide application of diesel engines, the performance requirements are getting higher and higher. In the past, the simple near-linear processing of diesel engines and the traditional PID control model can no longer meet the requirements of production and life, and load disturbances, friction disturbances, etc. are intensified. The complexity and uncertainty of the diesel engine model are overcome. The invention optimizes and designs the algorithm of the electric control speed regulating ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D31/00F02D41/14
CPCF02D31/001F02D41/1401F02D2041/142
Inventor 暨仲明汪凯
Owner HANGZHOU DIANZI UNIV
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