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A Fault Diagnosis Method for Abnormal Fuel Injection of Small Two-stroke Piston Engine

A technology for piston engine and fault diagnosis, applied in nuclear methods, internal combustion engine testing, etc., can solve problems such as inaccurate single information detection of wiring harness detection, achieve high accuracy, solve wiring harness detection, and ensure smooth operation.

Active Publication Date: 2021-12-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a fault diagnosis method for abnormal oil injection of a small two-stroke piston engine, so as to solve the problem of simple wiring harness detection or inaccurate single information detection in the prior art

Method used

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  • A Fault Diagnosis Method for Abnormal Fuel Injection of Small Two-stroke Piston Engine
  • A Fault Diagnosis Method for Abnormal Fuel Injection of Small Two-stroke Piston Engine
  • A Fault Diagnosis Method for Abnormal Fuel Injection of Small Two-stroke Piston Engine

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Embodiment

[0159] (1) Collect the fault data of the engine due to abnormal fuel injection, and collect various parameters of the engine through sensors installed in various positions of the engine body, including: engine fuel consumption, cylinder pressure, cylinder head vibration, speed, cylinder temperature, air pressure, etc. Fuel ratio and other data, and list the reasons for abnormal fuel injection of the engine, which are mainly divided into three categories: too much fuel injection, the main reason is that the pressure regulator is abnormal and the oil return pipe is blocked, resulting in poor oil return; the fuel injection is too small, The main reasons are insufficient oil pump pressure and blockage of the oil inlet filter; unstable fuel injection is mainly due to unstable oil supply pressure, poor contact of the oil pump circuit, and blockage of the oil inlet filter. Table 1 shows the data records of abnormal fuel injection of the engine, and draws the diagram of engine speed, f...

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Abstract

The invention discloses a fault diagnosis method for abnormal oil injection of a small two-stroke piston engine. Perform preprocessing, and use the method of variational mode decomposition to decompose the original fault signal to obtain each eigenmode function; perform singular value decomposition on the eigenmode function to establish a characteristic data set; correct 8 different fuel injection The corresponding engine state under the coefficient is used to mark the fault type for later fault classification and identification; the model CS_SVM of the cuckoo search support vector machine is established, and the optimal SVM model is output based on the initial data setting, and then the fault signal set is imported for training and identification , to obtain the final fault identification accuracy. The invention solves the shortcoming of simple wiring harness detection or inaccurate single information detection in the prior art, and can ensure smooth operation of the engine.

Description

technical field [0001] The invention relates to an engine fault diagnosis method, in particular to a fault diagnosis method for abnormal oil injection of a small two-stroke piston engine. Background technique [0002] As the power source of drones, small piston engines often work in complex and changeable environments with high temperature, high pressure, and heat friction, and some failures often occur. If the UAV fails to detect the problems of the engine in time before it is released, it may cause the UAV to fail to take off, or cause the UAV to crash during the flight, so the fault diagnosis of the engine must be carried out. There are various types and causes of engine faults, and the common fault is abnormal fuel injection; currently, most of the faults for abnormal fuel injection are regular maintenance, replacement or some simple line detection, but these methods often cannot meet the needs. The diagnostic accuracy is not enough. Contents of the invention [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M15/05G06N20/10
CPCG01M15/05G06N20/10
Inventor 毛建国赵飞陈伟张晨胡委丁鑫权闫志伟张耀
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS