CN104121127B - The defining method of fuel oil injector amount compensate for reference operating mode point - Google Patents

Abstract

The present invention relates to the defining method of a kind of fuel oil injector amount compensate for reference operating mode point, its actual pulsewidth comprising the steps: a, determining oil thrower; B, actual pulsewidth is poor with theoretical pwm value; C, get and the oil thrower of above-mentioned homologous series, obtain the pulse width difference table of one group of homologous series oil thrower under different operating mode; D, the operating mode division different zones worked according to big young pathbreaker's oil thrower of rail pressure, oil amount; E, the relative coefficient added up in same region between different operating mode; When relative coefficient is greater than setting threshold value in the same area, carry out operating mode coverage statistics, using the widest for coverage corresponding operating mode as the oil amount compensate for reference operating mode point in described region; F, repeating step e, until obtaining the oil amount compensate for reference operating mode point in all regions. Step of the present invention is simple, easy to operate, the fuel charge of oil thrower can be carried out fine compensation, it is achieved to the compensation of oil thrower full working scope, wide accommodation, safe and reliable.

Description

The defining method of fuel oil injector amount compensate for reference operating mode point

Technical field

The present invention relates to a kind of defining method, the defining method of especially a kind of fuel oil injector amount compensate for reference operating mode point, belong to the technical field of oil thrower control.

Background technology

In Electrocontrolled high-pressure common rail prime the fuel system, fuel charge determines by the excitation time of rail pressure and oil thrower. Also that is to say, for same oil thrower, due to it orifice number, injection diameter and oil spout bore the mechanical parameters such as angle it has been determined that in identical rail pressure with under the excitation time, fuel charge should be a determined value in theory. But in batch production process, the machinofacture error of oil thrower itself is inevitable, and each part forming oil thrower all also exists manufacture error, the different fuel charge differences between final oil thrower will be caused after assembling, thus cause the engine output also can difference to some extent between different cylinder. If this species diversity do not compensated, the accurate control of fuel charge will be affected by Electrocontrolled high-pressure common rail prime the fuel system.

At present, it is when oil thrower production is rolled off the production line that fuel oil injector amount generally current in the industry compensates algorithm, test this oil thrower with reference to the actual oil amount at operating mode point place and the difference of name oil amount, and record in memory, oil thrower is installed after on the engine, electronically controlled unit (ECU) reads the reference point outage value in storer, and the algorithm according to setting maps in whole fuel oil injector rating curve with reference to the outage value put, thus realize the oil amount under engine full working scope being compensated, it can be specifically the technical scheme disclosed in " a kind of correcting method for electromagnetic valve of common-rail diesel injector " of CN102192034A with reference to publication number. in the fuel injector magnetic system modification method that described open file uses, mention that reference point that oil amount compensates is determined by the demarcation point of oil thrower at each crucial operation condition, such as engine maximum torque point, engine idle operation point, engine calibration power point etc. the scheme benefit of this kind of reference point is used to be these oil amount accuracies demarcating individually some operating mode are made moderate progress, but for the full working scope that engine runs, obvious evidence does not show to make fuel oil injector amount more accurate. therefore, electric-controlled fuel injector oil amount compensation technique needs a kind of reference operating mode point defining method having more cogency badly.

Summary of the invention

It is an object of the invention to overcome the deficiencies in the prior art, it is provided that the defining method of a kind of fuel oil injector amount compensate for reference operating mode point, its step is simple, easy to operate, the fuel charge of oil thrower can be carried out fine compensation, it is achieved to the compensation of oil thrower full working scope, wide accommodation, safe and reliable.

According to technical scheme provided by the invention, the defining method of a kind of fuel oil injector amount compensate for reference operating mode point, the defining method of described oil amount compensate for reference operating mode point comprises the steps:

A, bench testing is utilized to determine the actual pulsewidth of oil thrower correspondence under some different rail pressures, oil amount are determined operating mode;

B, by above-mentioned obtaining different rail pressure, oil amount is determined that the actual pulsewidth of correspondence is poor with the theoretical pwm value of described oil thrower under corresponding operating mode under operating mode, obtains the pulse width difference under some difference operating modes;

C, get the oil thrower with above-mentioned homologous series and repeat above-mentioned steps a and step b, obtain the pulse width difference table of one group of homologous series oil thrower under different operating mode;

D, the operating mode division different zones worked according to big young pathbreaker's oil thrower of rail pressure, oil amount, so that the pulse width difference in step c is fallen in different regions;

E, according to above-mentioned pulse width difference, add up in same region the relative coefficient between different operating mode; When, in steps d, when relative coefficient is greater than setting threshold value in the same area, carrying out operating mode coverage statistics, using the widest for coverage corresponding operating mode as the oil amount compensate for reference operating mode point in described region;

F, repeating step e, until obtaining the oil amount compensate for reference operating mode point in all regions.

In described step e, when the operating mode that in the same area, coverage is identical is greater than one, get the oil amount compensate for reference operating mode point of relative coefficient mean value as described region. In described steps d, the operating mode that oil thrower works is divided into six regions.

In described step e, the relative coefficient between different operating mode is calculated as:

$R_{\mathrm{mn}}^2=\frac{{\left({\mathrm{\Σ}}_{i=1}^j(x_{\mathrm{mi}}-{\stackrel{\‾}{x}}_m)(y_{\mathrm{ni}}-{\stackrel{\‾}{y}}_n)\right)}^2}{{\mathrm{\Σ}}_{i=1}^j{(x_{\mathrm{mi}}-{\stackrel{\‾}{x}}_m)}^2{\mathrm{\Σ}}_{i=1}^j{(y_{\mathrm{ni}}-{\stackrel{\‾}{y}}_n)}^2}$

Wherein, m, n are respectively two different operating modes, x_miIt is the pulse width difference of i-th oil thrower under operating mode m, y_niBeing the pulse width difference of i-th oil thrower under operating mode n, j is the oil thrower total amount carrying out in step c testing,For the average pulse of all oil throwers under operating mode m is poor,For the average pulse of all oil throwers under operating mode n is poor,For the pulse width difference relative coefficient of homologous series oil thrower under operating mode m and operating mode n.

In described step e, setting threshold value is 0.8.

The advantage of the present invention: from the angle of electric-controlled fuel injector oil flow characteristic and Principle of Statistics, it is determined that fuel oil injector amount compensate for reference operating mode point. It is the line segment aggregate that slope is not identical that shape according to electric-controlled fuel injector oil rating curve is approximated to it, according to operating mode, rational curve is divided into different zones, also exactly curve is carried out local linearization process. In each region, the actual pulsewidth of the different operating mode of multiple oil thrower and the difference of name pulsewidth are carried out statistical study, obtain the quantized result of operating mode dependency in this region, the last quantized result level of coverage according to different operating mode determines oil amount compensate for reference operating mode point, step is simple, easy to operate, the fuel charge of oil thrower can be carried out fine compensation, it is achieved to the compensation of oil thrower full working scope, wide accommodation, safe and reliable.

Accompanying drawing explanation

Fig. 1 is the relative coefficient schematic diagram of operating mode 1 and operating mode 3 in the embodiment of the present invention.

Fig. 2 is the relative coefficient schematic diagram of operating mode 1 and operating mode 2 in the embodiment of the present invention.

Fig. 3 is that the operating mode of oil thrower is divided the schematic diagram in six regions by the present invention.

Fig. 4 is the calculating cartogram of the relative coefficient under the different operating mode of the present invention.

Fig. 5 is the schematic diagram of coverage statistics under the different operating mode of the present invention.

Fig. 6 is the schematic diagram of coverage statistics under the different operating mode of the present invention.

Embodiment

Below in conjunction with concrete drawings and Examples, the invention will be further described.

As shown in Fig. 1��Fig. 6: in order to accurately obtain the oil amount compensate for reference operating mode point of different oil thrower, the defining method of oil amount compensate for reference operating mode point of the present invention comprises the steps:

A, bench testing is utilized to determine the actual pulsewidth of oil thrower correspondence under some different rail pressures, oil amount are determined operating mode;

In the embodiment of the present invention, bench testing is the routine test in order to determine oil thrower spray characteristic, and different rail pressure, oil amount generally can be measured from the angle of interval numerical value, generally, and rail pressure interval 100bar, oil amount interval 5mm³, in the specific implementation, it is also possible to select according to actual needs.

B, by above-mentioned obtaining different rail pressure, oil amount is determined that the actual pulsewidth of correspondence is poor with the theoretical pwm value of described oil thrower under corresponding operating mode under operating mode, obtains the pulse width difference under some difference operating modes;

The theoretical pwm value of described oil thrower refers to according to the pwm value that design index ought to obtain, oil thrower can be obtained by step a and measure, at different rail pressure, oil, the actual pulsewidth being determined operating mode, actual pulsewidth and theoretical pwm value are done difference computing, the pulse width difference under different operating mode can be obtained.

C, get the oil thrower with above-mentioned homologous series and repeat above-mentioned steps a and step b, obtain the pulse width difference table of one group of homologous series oil thrower under different operating mode;

In the embodiment of the present invention, get the oil thrower quantity determining homologous series more than 100, namely obtain the pulse width difference of homologous series more than 100 oil throwers under different operating mode, all pulse width difference are placed in form, obtain pulse width difference table.

D, the operating mode division different zones worked according to big young pathbreaker's oil thrower of rail pressure, oil amount, so that the pulse width difference in step c is fallen in different regions;

When the present invention specifically implements, the operating mode that oil thrower works is divided into six regions, as shown in Figure 3, it is divided into A region, B region, C region, D region, E region and region, six, F region according to rail pressure, the oil amount of oil thrower, after dividing region, drop in corresponding region by the pulse width difference correspondence under different rail pressure, oil amount.

E, according to above-mentioned pulse width difference, add up in same region the relative coefficient between different operating mode; When, in steps d, when relative coefficient is greater than setting threshold value in the same area, carrying out operating mode coverage statistics, using the widest for coverage corresponding operating mode as the oil amount compensate for reference operating mode point in described region;

In the embodiment of the present invention, when statistic correlation coefficient, the relative coefficient that the different operating modes in the same area carry out operating mode between two calculates, and is calculated as by the relative coefficient between different operating mode:

$R_{\mathrm{mn}}^2=\frac{{\left({\mathrm{\Σ}}_{i=1}^j(x_{\mathrm{mi}}-{\stackrel{\‾}{x}}_m)(y_{\mathrm{ni}}-{\stackrel{\‾}{y}}_n)\right)}^2}{{\mathrm{\Σ}}_{i=1}^j{(x_{\mathrm{mi}}-{\stackrel{\‾}{x}}_m)}^2{\mathrm{\Σ}}_{i=1}^j{(y_{\mathrm{ni}}-{\stackrel{\‾}{y}}_n)}^2}$

Wherein, m, n are respectively two different operating modes, x_miIt is the pulse width difference of i-th oil thrower under operating mode m, y_niBeing the pulse width difference of i-th oil thrower under operating mode n, j is the oil thrower total amount carrying out in step c testing,For the average pulse of all oil throwers under operating mode m is poor,For the average pulse of all oil throwers under operating mode n is poor,For the pulse width difference relative coefficient of homologous series oil thrower under operating mode m and operating mode n. As shown in Figure 4, relative coefficient is more more big close to 1 explanation degree of correlation, as depicted in figs. 1 and 2,AndCloser to 1, therefore, the dependency that dependency between operating mode 2 and operating mode 1 is obviously better than between operating mode 3 and operating mode 1.

In the embodiment of the present invention, described setting threshold value is 0.8, namely adds up the operating mode coverage that in the same area, relative coefficient is greater than 0.8. As shown in Figure 5, relative coefficient between 5 operating mode points in the A of zoning. Remove operating mode point and the relative coefficient of self be 1 do not add up outside, the relative coefficient of operating mode 1 and other operating modes be greater than 0.8 have 2 points, the relative coefficient of operating mode 2 and other operating modes be greater than 0.8 have 1 point, the relative coefficient of operating mode 3 and other operating modes be greater than 0.8 have 2 points, the relative coefficient of operating mode 4 and other operating modes be greater than 0.8 have 3 points, the relative coefficient of operating mode 5 and other operating modes be greater than 0.8 have 2 points. Therefore, the operating mode coverage of operating mode 1��operating mode 5 is respectively 2,1,2,3,2, so the operating mode 4 of the some correspondence selecting operating mode coverage maximum is the oil amount compensate for reference operating mode point in the A of region. For other regions, carry out identical operation, repeat no more herein.

When the operating mode that in the same area, coverage is identical is greater than one, get the oil amount compensate for reference operating mode point of relative coefficient mean value as described region. As shown in Figure 6, if the operating mode coverage of operating mode 1��operating mode 5 is respectively 2,2,3,3,2 in the A of region, then operating mode 3 is all identical with the maximal cover degree of operating mode 4 is all 3, consequently, it is desirable to calculate the relative coefficient mean value of these two operating modes respectivelyMethod of calculation are as follows:

${{\stackrel{\‾}{R}}_3}^2=(R_{31}^2+R_{32}^2+R_{34}^2+R_{35}^2)/4;$

${{\stackrel{\‾}{R}}_4}^2=(R_{41}^2+R_{42}^2+R_{43}^2+R_{45}^2)/4$

IfThen get operating mode 3 for the oil amount compensate for reference point operating mode in the A of region, otherwise get operating mode 4 for the oil amount compensate for reference operating mode point in the A of region. For other regions, carry out identical operation, repeat no more herein.

F, repeating step e, until obtaining the oil amount compensate for reference operating mode point in all regions.

By above-mentioned steps, obtain the oil amount compensate for reference operating mode point in six regions, all oil amount compensate for reference operating mode point combinations obtained are obtained fuel oil injector amount compensate for reference operating mode point.

The present invention is from the angle of electric-controlled fuel injector oil flow characteristic and Principle of Statistics, it is determined that fuel oil injector amount compensate for reference operating mode point. It is the line segment aggregate that slope is not identical that shape according to electric-controlled fuel injector oil rating curve is approximated to it, according to operating mode, rational curve is divided into different zones, also exactly curve is carried out local linearization process. In each region, the actual pulsewidth of the different operating mode of multiple oil thrower and the difference of name pulsewidth are carried out statistical study, obtain the quantized result of operating mode dependency in this region, the last quantized result level of coverage according to different operating mode determines oil amount compensate for reference operating mode point, step is simple, easy to operate, the fuel charge of oil thrower can be carried out fine compensation, it is achieved to the compensation of oil thrower full working scope, wide accommodation, safe and reliable.

Claims (5)

1. a defining method for fuel oil injector amount compensate for reference operating mode point, is characterized in that, the defining method of described oil amount compensate for reference operating mode point comprises the steps:

(a), utilize bench testing to determine the actual pulsewidth of oil thrower correspondence under some different rail pressures, oil amount are determined operating mode;

(b), step (a) is obtained different rail pressure, oil amount is determined that the actual pulsewidth of correspondence is poor with the theoretical pwm value of described oil thrower under corresponding operating mode under operating mode, obtains the pulse width difference under some difference operating modes;

(c), get the oil thrower with described oil thrower homologous series and repeat above-mentioned steps (a) and step (b), obtain the pulse width difference table of one group of homologous series oil thrower under different operating mode;

D (), the operating mode division different zones worked according to big young pathbreaker's oil thrower of rail pressure, oil amount, so that the pulse width difference in step (c) is fallen in different regions;

(e), according to above-mentioned pulse width difference, add up in same region the relative coefficient between different operating mode; When, in step (d), when relative coefficient is greater than setting threshold value in the same area, carrying out operating mode coverage statistics, using the widest for coverage corresponding operating mode as the oil amount compensate for reference operating mode point in described the same area;

F (), repeating step (e), until obtaining the oil amount compensate for reference operating mode point in all regions.

2. the defining method of fuel oil injector amount compensate for reference operating mode point according to claim 1, it is characterized in that: in described step (e), when the operating mode that in the same area, coverage is identical is greater than one, get the oil amount compensate for reference operating mode point of relative coefficient mean value as described the same area.

3. the defining method of fuel oil injector amount compensate for reference operating mode point according to claim 1, is characterized in that: in described step (d), and the operating mode that oil thrower works is divided into six regions.

4. the defining method of fuel oil injector amount compensate for reference operating mode point according to claim 1, is characterized in that, in described step (e), is calculated as by the relative coefficient between different operating mode:

$R_{mn}^2=\frac{{\left({\Σ}_{i=1}^j\left(x_{mi}-{\stackrel{\‾}{x}}_m\right)\left(y_{ni}-{\stackrel{\‾}{y}}_n\right)\right)}^2}{{\Σ}_{i=1}^j{\left(x_{mi}-{\stackrel{\‾}{x}}_m\right)}^2{\Σ}_{i=1}^j{\left(y_{ni}-{\stackrel{\‾}{y}}_n\right)}^2}$

Wherein, m, n are respectively two different operating modes, x_miIt is the pulse width difference of i-th oil thrower under operating mode m, y_niBeing the pulse width difference of i-th oil thrower under operating mode n, j is the oil thrower total amount carrying out in step (c) testing,For the average pulse of all oil throwers under operating mode m is poor,For the average pulse of all oil throwers under operating mode n is poor,For the pulse width difference relative coefficient of homologous series oil thrower under operating mode m and operating mode n.

5. the defining method of fuel oil injector amount compensate for reference operating mode point according to claim 1, is characterized in that: in described step (e), and setting threshold value is 0.8.