Unlock instant, AI-driven research and patent intelligence for your innovation.

An engine failure diagnosis correction method and system

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

Active Publication Date: 2022-08-05
WEICHAI POWER CO LTD
View PDF0 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • An engine failure diagnosis correction method and system
  • An engine failure diagnosis correction method and system
  • An engine failure diagnosis correction method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0057] S1. Under preset operating 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. (The 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,...

Embodiment 2

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

[0092] The acquisition module is used to acquire the crankshaft angular acceleration corresponding to each cylinder in a working cycle and the crankshaft phase corresponding to different crankshaft angular accelerations under preset working conditions; based on the crankshaft speed sensor and the camshaft sensor. 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, the crankshaft phase corresponding to the occurrence of the maximum crankshaft angular acceleration, and the pre-calibrated MAP table selected from the acquisition module The absolute value of acceleration deviation α and the correspon...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an engine fault diagnosis and correction method and system. The method includes: based on the crankshaft angular acceleration corresponding to each cylinder and the corresponding crankshaft phase; The calibrated MAP table calculates the absolute value α of the maximum crankshaft angular acceleration deviation corresponding to each cylinder and the corresponding absolute value β of the crankshaft phase deviation, and determines and identifies the cylinder with the corresponding deviation fault based on the corresponding preset deviation value; calculate again; Determine and identify the cylinder with the corresponding deviation fault. When the same cylinder appears in the two identification results and the deviation fault occurs in the same cylinder, the cylinder is diagnosed as having a deviation fault; the corresponding fuel injection parameters are corrected according to the diagnosis results; the system includes A program module that executes the above method. The invention can effectively identify the cylinder failure and make corresponding corrections to realize the control of the combustion consistency of the 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 prior art mainly uses the instantaneous rotational speed obtained by the crankshaft rotational speed sensor to diagnose the misfire of the engine cylinder. The instantaneous rotational speed is greatly affected by the inertia of the vehicle transmission system, and misdiagnosis often occurs. And at present, the combustion parameters (fuel injection parameters) monitoring and closed-loop control correction are mainly carried out through the combustion model or by using the cylinder pressure sensor. The accuracy of the combustion model is very complex, and a large number of simplified and empirical formulas are used, which requires repeated calibration and verification, and the adaptability is poor. For the purpose of precise control; the installat...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/22F02D41/30F02D41/08
CPCF02D41/22F02D41/3005F02D41/08
Inventor 张朝阳
Owner WEICHAI POWER CO LTD