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Intelligent fault diagnosis method for diesel engine

An intelligent diagnosis, diesel engine technology, applied in the direction of internal combustion engine testing, etc., can solve the problem that the determination of other parts of the fault is difficult to accurately determine.

Inactive Publication Date: 2011-06-15
MILITARY TRANSPORTATION UNIV PLA
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  • Abstract
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  • Claims
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Problems solved by technology

[0008] Combustion process monitoring: Use the in-cylinder pressure sensor to monitor the change of the combustion pressure in the cylinder, and understand the working quality of each cylinder and the wear of the piston ring through the analysis of the combustion pressure. In practice, it is difficult to accurately determine

Method used

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  • Intelligent fault diagnosis method for diesel engine
  • Intelligent fault diagnosis method for diesel engine
  • Intelligent fault diagnosis method for diesel engine

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Embodiment Construction

[0038] see figure 1 , a kind of diesel engine fault intelligent diagnosis method of the present invention, comprises the steps:

[0039] 1) Start the diesel engine to be tested. If the diesel engine to be tested cannot start normally, check the no-load battery voltage, battery internal resistance (battery voltage waveform), starting voltage, starting current, starting speed and other signals to judge whether the diesel engine can not be started normally. reason.

[0040] If the diesel engine to be detected can be started, the power of the diesel engine to be detected is judged, and the no-load acceleration time, deceleration time, average power, instantaneous power and torque at the set speed of the engine are detected by the crankshaft speed sensor and the cylinder pressure sensor, and the waiting time is calculated. Detect the power of the diesel engine, if the power drops, it is judged as a faulty diesel engine.

[0041] 2) By measuring the relative cylinder pressure rati...

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Abstract

The invention discloses an intelligent fault diagnosis method for a diesel engine, comprising the following steps: (1) judging the power of a diesel engine to be detected, and determining that the diesel engine has faults if the power lowers; (2) positioning the fault cylinder of the fault diesel engine; (3) diagnosing the oil supply system of the fault cylinder, providing fault information if the cylinder has faults; (4) if the oil supply system of the fault cylinder does not have faults, diagnosing the air tightness of the fault cylinder, and providing the fault information if air tightness faults exist; 5) if the air tightness of the fault cylinder does not have faults, diagnosing the abnormal sound of the fault cylinder, and providing the abnormal sound information if abnormal sound exists; and (6) if the fault cylinder does not have the abnormal sound, judging that the diesel engine is in the non-fault state. According to the intelligent fault diagnosis method for a diesel engine, the faults of the diesel engine can be quickly and comprehensively diagnosed.

Description

technical field [0001] The invention relates to the technical field of diesel engines, in particular to a fault detection method for diesel engines. Background technique [0002] Diesel engine is a reciprocating power machine with a wide range of applications, a large amount of equipment, and a complex structure. The problem of fault diagnosis has always been the focus and difficulty of vehicle equipment support. The complexity of its composition structure and working principle leads to the complexity of its fault symptoms, the difficulty of fault signal detection, and the extremely intricate nonlinear mapping relationship between fault causes, fault symptoms and characteristic parameter values. The same fault cause often corresponds to multiple fault symptoms, and the same fault symptom can be reflected by multiple characteristic parameters; conversely, multiple characteristic parameters are quantitative descriptions of one or some symptoms in different degrees, and the sam...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M15/05
Inventor 刘瑞林董素荣刘刚许翔周广猛吴晓
Owner MILITARY TRANSPORTATION UNIV PLA
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