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Output representation method of detecting result of cylinder pressure

A technology of detection results and cylinder pressure, which is used in measurement devices, internal combustion engine testing, and measurement of rapid changes. The effect of development and improvement

Inactive Publication Date: 2010-12-29
苏州工业园区广福汽保机电设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the printing of test results is only output in digital mode, so that people cannot intuitively and quickly observe the dynamic performance and imbalance of each cylinder of the engine

Method used

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  • Output representation method of detecting result of cylinder pressure
  • Output representation method of detecting result of cylinder pressure
  • Output representation method of detecting result of cylinder pressure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The detected objects are three cylinders, and the first one is detected first # Maximum pressure value X during cylinder compression 1 = 13.8bar, 2nd # Maximum pressure value X during cylinder compression 2 = 14bar, 3rd # Maximum pressure value X during cylinder compression 3 = 14.3 bar;

[0036] Compare X 1 、X 2 、X 3 , taking the maximum value of

[0037] Y MAX =MAX(X 1 、X 2 、X 3 ) = 14.3 bar;

[0038] Compare X 1 、X 2 、X 3 , taking the minimum value among them,

[0039] Y MIN=MIN(X 1 、X 2 、X 3 ) = 13.8 bar;

[0040] Y MAX Corresponding to the maximum length in the histogram, the graph length is 50pis; Y MIN Corresponding to the minimum length in the histogram, the graph length is 10pis;

[0041] Substitute the maximum pressure value in the compression process of each cylinder into the formula, respectively convert the length corresponding to the histogram,

[0042] i.e. 1st # The cylinder pressure detection result corresponds to the length of...

Embodiment 2

[0050] The objects to be detected are four cylinders, the first one is detected first # Maximum pressure value X during cylinder compression 1 = 5 bar, 2nd # Maximum pressure value X during cylinder compression 2 = 7bar, 3rd # Maximum pressure value X during cylinder compression 3 = 6 bar, 4th # Maximum pressure value X during cylinder compression 4 =40bar;

[0051] Compare X 1 、X 2 、X 3 、X 4 , taking the maximum value of

[0052] Y MAX =MAX(X 1 、X 2 、X 3 、X 4 )=40bar;

[0053] Compare X 1 、X 2 、X 3 、X 4 , taking the minimum value among them,

[0054] Y MIN =MIN(X 1 、X 2 、X 3 、X 4 ) = 5 bar;

[0055] Y MAX Corresponding to the maximum length in the histogram, the graph length is 50pis; Y MIN Corresponding to the minimum length in the histogram, the graph length is 10pis;

[0056] Substitute the maximum pressure value in the compression process of each cylinder into the formula, respectively convert the length corresponding to the histogram,

[00...

Embodiment 3

[0067] The detected objects are eight cylinders, and the first # Maximum pressure value X during cylinder compression 1 = 13 bar, 2nd # Maximum pressure value X during cylinder compression 2 = 13.1 bar, 3rd # Maximum pressure value X during cylinder compression 3 = 13.2bar, 4th # Maximum pressure value X during cylinder compression 4 = 13.2bar, 5th # Maximum pressure value X during cylinder compression 5 = 13.1bar, 6th # Maximum pressure value X during cylinder compression 6 = 13.3bar, 7th # Maximum pressure value X during cylinder compression 7 = 13bar, 8th # Maximum pressure value X during cylinder compression 8 = 13.4 bar;

[0068] Compare X 1 、X 2 、X 3 、X 4 、X 5 、X 6 、X 7 、X 8 , taking the maximum value of

[0069] Y MAX =MAX(X 1 、X 2 、X 3 、X 4 、X 5 、X 6 、X 7 、X 8 ) = 13 bar;

[0070] Compare X 1 、X 2 、X 3 、X 4 、X 5 、X 6 、X 7 、X 8 , taking the minimum value among them,

[0071] Y MIN =MIN(X 1 、X 2 、X 3 、X 4 、X 5 、X 6 、X 7 、X...

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Abstract

The invention provides an output notation of a cylinder pressure test result. At first maximum pressure values are tested during each cylinder compression process, that is X1, X2, X3...Xi; then the maximum values are compared to choose a maximum value Ymax and a minimum value Ymin thereof, and then a histogram is drawn, wherein, the Ymax is corresponding to the maximum length of the histogram andthe graphics length thereof is 50pis; the Ymin is corresponding to the minimum length of the histogram and the graphics length thereof is 10pis; the maximum values of each cylinder compression process are respectively put into the following formula: Li is equal to 10 plus ((Xi minus YMIN) multiplied by 40)divided by (YMAX minus Y MIN), for respectively calculating the corresponding length of the histogram, thus getting the respective lengths of the histogram, that are L1, L2, L3...Li which are corresponding to the cylinder pressure test results, that are 1<#>, 2<#>, 3<#>...i<#>. The output notation of a cylinder pressure test result transforms different pressure test results into histograms with different length, intuitively and quickly finds the dynamical performance and the disequilibrium performance of each cylinder by observing the histograms, is simple, practical, and worthy of being popularized.

Description

technical field [0001] The invention relates to a result output mode of a detection device, in particular to an output expression method of different cylinder pressure detection results of an automobile engine. Background technique [0002] At present, in the field of automobiles, the cylinder pressure tester is used to detect the maximum pressure generated during the compression process of each cylinder of the automobile engine, as the result of the pressure test, and then to check and judge the dynamic performance and balance of each cylinder; the current cylinder pressure tester is roughly divided into the following two types kind: [0003] (1) Pointer cylinder pressure gauge, with a head and a pipe with a one-way valve connected to the spark plug of the cylinder, using a mechanical method to detect the pressure during the cylinder compression process; it is detected by observing the position of the pointer on the head result. This method requires human participation, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L23/00G01M15/08
Inventor 沈赵勇
Owner 苏州工业园区广福汽保机电设备有限公司