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Oil injector grouping method

A grouping method and fuel injector technology, which is applied in the direction of instruments, fuel injection devices, machines/engines, etc., can solve the problems that the consistency of fuel injectors cannot be guaranteed, and achieve the effects of reducing dimensions, ensuring consistency, and adapting to a wide range

Active Publication Date: 2019-12-10
FAW JIEFANG AUTOMOTIVE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There are also obvious problems in the existing fuel volume grouping method. For example, grouping only according to the fuel volume of a certain working point will lead to the fact that although the fuel injectors in the same group are working at this working point, the consistency of the fuel injectors in the same group is good, but the engine When operating at other operating points, the consistency of the injector cannot be guaranteed

Method used

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Experimental program
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Embodiment 1

[0039] Such as figure 1 As shown, this embodiment provides a fuel injector grouping method, including the following steps:

[0040] Step a. Use the fuel injector performance debugging bench to carry out the fuel injection quantity test, and sequentially determine the corresponding number of N fuel injectors produced in batches under several debugging operating points determined by different rail pressures and control pulse widths. Actual fuel injection quantity;

[0041] Among them, the actual fuel injection quantity of the i-th injector at the j-th commissioning point is Q ij ;

[0042] Step b. For the actual fuel injection quantity data Q of all debugging working points ij Carry out standardized processing to form oil quantity standardized data S ij ;

[0043] Step c, standardize the actual fuel injection quantity data Q after step b ij As an input variable, the S i1 , S i2 …S ij There are correlated variables in the transformation into M linearly uncorrelated princ...

Embodiment 2

[0064] This embodiment provides a fuel injector grouping method, including the following steps:

[0065] Step S1, assuming that there are 500 fuel injectors that need to be grouped, first use the bench test to determine the actual fuel injection volumes of these fuel injectors under the six characteristic operating conditions determined by the preset different rail pressures and pulse widths . Among them, the actual fuel injection quantity of the i-th injector at the j-th commissioning point is Q ij , i=1,2,...,500, j=1,2,...,6.

[0066] Step S2, for the actual fuel injection quantity data Q of all debugging working points ij Carry out standardized processing to form oil quantity standardized data S ij ; The preferred standardization process is the z-score method, where Q ij is the actual fuel injection quantity of the i-th injector at the j-th commissioning point, is the average fuel injection quantity of 500 injectors at the jth commissioning point, σ j is the stand...

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Abstract

The invention relates to the technical field of engine part tests, and discloses a fuel injector grouping method, which comprises the following steps of: performing a fuel injection quantity test by using a fuel injector performance debugging rack, and sequentially determining actual fuel injection quantity data Qij corresponding to N fuel injectors produced in batches under a plurality of different debugging working conditions; standardizing the Qij of all the debugging working condition points to form oil quantity standardized data Sij; taking the standardized Qij as an input variable, and converting variables with correlation in Si1, Si2-Sij into M linearly uncorrelated principal components through orthogonal transformation according to a principal component analysis method; making clustering analysis on the obtained dimensions of the M principal components, and dividing the N fuel injectors into k groups; and obtaining the optimal k value to finish fuel quantity grouping of the fuel injectors. Oil quantity grouping can be carried out on the oil injector assemblies produced in batches, and the consistency of the oil injectors in the same group can be guaranteed to the maximum extent on the basis of not changing the technical conditions of an existing production process.

Description

technical field [0001] The invention relates to the technical field of engine component testing, in particular to a method for grouping fuel injectors. Background technique [0002] In the electronically controlled high-pressure common rail fuel system, the consistency of the injector has a great influence on the emission level of the diesel engine and the fuel economy. In the process of mass production, due to the inevitable mechanical manufacturing errors of the parts that make up the injector, and the limitations of the processes and implementation conditions of each stage of production, processing, and assembly, there are gaps between each injector assembly. The difference in fuel injection quantity will lead to differences in engine output power among different cylinders, which will cause the vehicle's emission performance to deteriorate and fuel consumption to increase. [0003] At present, the industry generally adopts the method of injector oil volume grouping to en...

Claims

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Application Information

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IPC IPC(8): G06K9/62F02M65/00
CPCF02M65/00G06F18/23213G06F18/2135G06F18/24
Inventor 冯源徐剑飞李晔吴健王立启
Owner FAW JIEFANG AUTOMOTIVE CO