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Engine fault diagnosis and correction method and system

A fault diagnosis and engine technology, applied in the direction of engine control, machine/engine, mechanical equipment, etc., can solve problems such as crankshaft crankshaft phase deformation, engine running stability deterioration, power performance consistency damage, etc.

Active Publication Date: 2020-04-28
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under normal working conditions, the dynamic performance of each cylinder is basically the same, and the engine runs smoothly. Although the instantaneous angular acceleration fluctuation of the crankshaft corresponding to each cylinder and the corresponding crankshaft phase are abnormal, they are always within a certain range and show certain regularity; but when When a certain cylinder is not working properly, the consistency of power performance will be destroyed, the running stability of the engine will deteriorate, and the instantaneous angular acceleration fluctuation signal of the crankshaft and the corresponding crankshaft phase will be seriously deformed. According to the degree of deformation, it can be identified that each cylinder is working good and bad inside the loop

Method used

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  • Engine fault diagnosis and correction method and system
  • Engine fault diagnosis and correction method and system
  • Engine fault diagnosis and correction method and system

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Embodiment 1

[0055] Depend on Figure 1 to Figure 3 Commonly shown, this embodiment discloses a method for diagnosing and correcting engine faults, including the following steps:

[0056] A method for diagnosing and correcting engine faults, the engine includes a plurality of cylinders and a crankshaft associated with the plurality of cylinders; it is characterized in that the method includes the following steps:

[0057] S1. Under preset working conditions, (the engine electronic control unit) obtains the crankshaft angular acceleration corresponding to each cylinder in one working cycle, and the crankshaft phase corresponding to different crankshaft angular accelerations. (Crankshaft angular acceleration and crankshaft phase can be obtained according to the signals transmitted by the existing crankshaft speed sensor and camshaft speed sensor on the engine, and the means of obtaining are well known to those skilled in the art, and will not be repeated here).

[0058] Wherein, the preset ...

Embodiment 2

[0091] This embodiment discloses an engine fault diagnosis and correction system for implementing the above engine fault diagnosis and correction method. Depend on Figure 4 As shown, the system includes:

[0092] The acquisition module is used to obtain the crankshaft angular acceleration corresponding to each cylinder in a working cycle and the crankshaft phase corresponding to different crankshaft angular acceleration under preset working conditions; Signal acquisition.

[0093] The first calculation module is used to calculate the maximum crankshaft angle corresponding to each cylinder according to the maximum crankshaft angular acceleration corresponding to each cylinder selected from the acquisition module, the corresponding crankshaft phase when the maximum crankshaft angular acceleration occurs, and the pre-calibrated MAP table The absolute value of the acceleration deviation α and the corresponding absolute value of the crankshaft phase deviation β.

[0094] The fi...

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Abstract

The invention discloses an engine fault diagnosis and correction method and system. The method comprises the steps that based on the crankshaft angular acceleration corresponding to air cylinders andthe corresponding crankshaft phase, a maximum crankshaft angular acceleration deviation absolute value alpha and a corresponding crankshaft phase deviation absolute value beta corresponding to each air cylinder is calculated according to the screened maximum crankshaft angular acceleration corresponding to each air cylinder, the corresponding crankshaft phase and a pre-calibrated MAP table, and based on the corresponding preset deviation value, the air cylinder with the corresponding deviation fault is judged and identified; calculating is carried out again to judge and identify the air cylinder with the corresponding deviation fault, and when the same air cylinder appears in the two identification results and the deviation faults of the air cylinder are the same, the diagnosis is that theair cylinder has the deviation fault; and corresponding oil injection parameters are corrected according to the diagnosis result. The system involves program modules for executing the method. According to the engine fault diagnosis and correction method and system, the air cylinder fault can be effectively identified, and corresponding correction is carried out to control the combustion consistency of an engine.

Description

technical field [0001] The invention belongs to the technical field of engine fault diagnosis and correction, and in particular relates to an engine fault diagnosis and correction method and system. Background technique [0002] The existing technology mainly uses the instantaneous speed obtained by the crankshaft speed sensor to diagnose engine cylinder misfire. The instantaneous speed is greatly affected by the inertia of the vehicle transmission system, and misdiagnosis often occurs. And at present, combustion parameters (fuel injection parameters) monitoring and closed-loop control correction are mainly carried out through combustion models or cylinder pressure sensors. The accuracy of combustion models is very complicated, and a large number of simplified and empirical formulas are used, requiring repeated calibration and verification. To achieve the purpose of precise control; In addition, the cylinder pressure sensor needs to be installed on the engine cylinder head, ...

Claims

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Application Information

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IPC IPC(8): F02D41/22F02D41/30F02D41/08
CPCF02D41/22F02D41/3005F02D41/08
Inventor 张朝阳
Owner WEICHAI POWER CO LTD