CN101451917A - Automobile inner chamber operating force comfort degree evaluating system and evaluating method - Google Patents

Abstract

An evaluation system and an evaluation method for comfort level of internal operating force of a vehicle are disclosed, characterized in that the system composition includes a vehicle-mounted data acquisition device composed of input/output devices including an analog-digital conversion data acquisition card, an acquisition channel, a vehicle-mounted computer motherboard, a keyboard and a display; for the operating devices, a displacement amount sensor for real-time measurement of an action force and an action force that is applied by a driver to internal operating devices of the vehicle is arranged, a parallel interface data transmission path of the computer is set based on the signal acquired by an external sensor as a data acquisition source of the data acquisition system, a plurality of data acquisition interfaces are utilized to data acquisition for different sensors simultaneously. The evaluation method is the evaluation for comfort level of degree of correlation of curves by comparing a standard curve of comfort level of the corresponding vehicle type with a real-time curve measured by the system and reflecting displacement amount variation characteristics of the action force and the action force that is applied by a driver to internal operating devices of the vehicle. The invention can evaluate comfort level of vehicle in accordance with practical requirement of carmaker.

Description

Automobile inner chamber operating force comfort degree evaluating system and evaluation method

Technical field

The present invention relates to be applied in the quality detecting system in the automobile production scene, more specifically say so and automobile is carried out the automobile inner chamber operating force comfort degree evaluating system and the evaluation method of quality evaluation.

Background technology

At present, in the production of automobile manufacturing enterprise, it is indispensable that the requirement of hommization becomes gradually, with human body the operating control of direct interactively is arranged to inner chamber of car is all kinds of, more require it to satisfy the human body comfort requirement, the comfortableness requirement of the mechanical characteristics of close ties is especially arranged with human-body fatigue and work damage,, all need to satisfy the human body comfort requirement such as the setting of the rotary resistance of steering gear, the design of clutch pedal hydrostatic transmission force value etc.But, now to the evaluation of inner chamber of car steering force comfortableness mainly according to workman's subjective judgement, utilize perhaps that shown instantaneous value carries out fuzzy Judgment on some data acquisition equipments of hand-kept, whether satisfy the comfortableness requirement thereby distinguish it.This a kind of deterministic process can only rely on workman's rough the passing judgment on of subjective sensation, and is to carry out the later stage after the data acquisition to judge that real-time is poor substantially, and erroneous judgement property is bigger, has expended bigger cost in checkout procedure.

Summary of the invention

The present invention is for avoiding above-mentioned existing in prior technology weak point, a kind of automobile inner chamber operating force comfort degree evaluating system and evaluation method being provided.In the hope of the process cost of saving the automobile inner chamber operating force comfort degree test and appraisal, improve the evaluating result precision, automobile product carried out the comfort level evaluation of operating control mechanical characteristics quickly and efficiently.

The technical scheme that technical solution problem of the present invention is adopted is:

The characteristics of automobile inner chamber operating force comfort degree evaluating system of the present invention are that its system's composition comprises:

Data acquisition system (DAS) adopts integrated setting, is by mould/number conversion data collecting card, acquisition channel, truck-mounted computer mainboard and comprises the vehicle carried data collecting device that the input-output unit of keyboard, display, interface constitutes;

Each external sensor, be provided for measuring in real time the acting force that the driver applies operating control in the inner chamber of car and the displacement sensor of acting force at each operating control that comprises clutch pedal, gas pedal, steering gear, hand brake handle, selector handle, voltage that collects with described external sensor or current analog signal are as the data acquisition sources of described data acquisition system (DAS);

Multichannel collecting is set the parallel interface data transfer path of computing machine by software, utilizes a plurality of data acquisition interfaces that different sensors is carried out data acquisition simultaneously.

The present invention utilizes the characteristics of the evaluation method of automobile inner chamber operating force comfort degree evaluating system to be:

The real-time curve of the acting force that the reflection driver who records with described system applies operating control in the inner chamber of car and the shift value variation characteristic of acting force, compare with the typical curve of corresponding vehicle comfort level, carry out the evaluation of comfortableness degree with the degree of correlation of described real-time curve and typical curve.

The characteristics of evaluation method of the present invention are to carry out as follows:

A, set up typical curve: the matured product to the evaluation vehicle screens, selection reaches the product that comfort level requires, utilize described data acquisition system (DAS) to carry out data acquisition, choose a plurality of moment point in a period of time zone according to the actual requirements and form abscissa axis, try to achieve the mathematical expectation of data on each moment point of repeatedly gathering, mathematical expectation is projected on the formed time shaft of a plurality of moment point of evaluation time section as ordinate, draw the mathematical expectation curve of this vehicle handling comfort, according to manipulation of physical gained curve the mathematical expectation curve is revised, typical curve as in the later stage evaluation procedure deposits database in;

B, measurement real-time curve: utilize described data acquisition system (DAS) that the operating control in the tested vechicle driving process is carried out data acquisition, time with a period of time zone that evaluation procedure was consumed is horizontal ordinate, utilize data that this section collect in the period value for ordinate, with each constantly pairing data value as each pairing ordinate value constantly, each such coordinate points is projected in the coordinate system, form and estimate needed real-time curve.

C, judgement measured curve and typical curve degree of correlation:

Described measured curve and typical curve all are by data acquisition projection gained on the time shaft that changes, and can establish:

The data acquisition of measured curve representative is: A={x ₁, x ₂..., x _i, i is the number of image data;

The data acquisition of typical curve representative is: $B=\{x_1^{\′},x_2^{\′},\·\·\·,x_i^{\′}\},$ I is the number of image data;

The related coefficient of the data acquisition of two sets of curves representatives is:

$\begin{array}{cc}\mathrm{\&rho;}(A,B)=\frac{\mathrm{\&Gamma;}(A,B)}{\sqrt{D\left(A\right)}\&CenterDot;\sqrt{D\left(B\right)}}& (0<\mathrm{\&rho;}<1)\end{array}---\left(1\right)$

Correlation parameter is calculated as: D (A)=E[X (A)-m (A)] ²

D(B)＝E[X(B)-m(B)] ²

Γ(A，B)＝cov[X(A)，X(B)]＝E[(X(A)-m(A))(X(B)-m(B))]

Wherein, the element of X (A), X (B) expression data acquisition A, B, the mean value function of m (A), m (B) expression data acquisition A, B; The calculating of symbol " E " expression mathematical expectation;

With inquartation ρ value space is divided:

Interval 1: ρ is 0.75～1, and interval 2: ρ is 0.5～0.75,

Interval 3: ρ is 0.25～0.5, and interval 4: ρ is 0～0.25;

Set evaluation criterion: described interval 1～4 corresponding respectively comfort level evaluation collection is: { C ₁, C ₂, C ₃, C ₄}={ is good, and be qualified, on the low side, too poor };

Related coefficient ρ according to formula (1) is obtained utilizes described evaluation criterion, make and related coefficient ρ location between corresponding comfort level evaluation conclusion.

Compared with the prior art, beneficial effect of the present invention is embodied in:

1, because the data with existing harvester is many as the instrument type, need to store into by record institute's numerical value of surveying manually or after recording data in the memory device for later stage evaluation use, its real-time, accuracy be deficiency to some extent all.Data acquisition system (DAS) among the present invention utilizes the multichannel collecting method to carry out real-time data acquisition and data processing, situation and the spent handling cost of manual record of effectively having avoided data to omit, improve the accuracy of gathering, reduced the cost of this working link of data acquisition.

2, because inner chamber of car steering force comfortableness is a kind of attribute of the automobile product that reflects in dynamic process, and the data variation process when therefore estimating also should be corresponding with this dynamic process, to improve the accuracy of estimating; The present invention is integrated as a whole with the data processing module in data acquisition module and the computer system, can in car running process, carry out data acquisition and processing, therefore data have very high real-time, have write down the dynamic data under the manipulation of physical situation accurately.

When 3, prior art is estimated automobile inner chamber operating force comfort degree, generally be to change by practical operation and observed data to carry out the experience judgement, lack agility and objectivity, and when estimating at different automobile types, owing to be that artificial experience is judged, can produce certain sensation deviation, aspect flexible, deficiency be arranged also.The method that the present invention utilizes real-time curve and typical curve degree of correlation to judge is estimated, and can formulate different typical curves at different automobile types on the one hand, has improved the flexibility of estimating; Evaluation result just can draw when manipulation process finishes on the one hand, has improved the agility of estimating; At last, evaluation is to be undertaken by mathematical computations, has improved the objectivity of estimating.

Description of drawings

Fig. 1 constitutes block diagram for system of the present invention.

Fig. 2 is an evaluation method synoptic diagram of the present invention.

Fig. 3 is an evaluation procedure data flowchart of the present invention.

Below by embodiment, the invention will be further described in conjunction with the accompanying drawings.

Embodiment

Referring to Fig. 1, each external sensor is to be provided for measuring in real time the acting force that the driver applies operating control in the inner chamber of car and the displacement sensor of acting force at each operating control that comprises clutch pedal, gas pedal, steering gear, hand brake handle, selector handle, and voltage that arrives with outside sensor acquisition or current analog signal are as the data acquisition sources of described data acquisition system (DAS); System's employing integrated setting is by mould/number conversion data collecting card, acquisition channel, truck-mounted computer mainboard and comprise that the relevant input-output unit of keyboard, display, interface constitutes the vehicle carried data collecting device; By collection to data, at first calculate typical curve and file, deposit enterprise database in; Then when product is tested and assessed, real time data by the data acquisition system (DAS) collection is that real-time curve is drawn on the basis again, from enterprise database, extract the amenity standards curve of the vehicle of testing and assessing simultaneously, the comfortableness degree of the product of surveying is estimated in calculating by the typical curve and the real-time curve degree of correlation, and the product information that satisfies amenity standards feeds back to enterprise database; Estimate overall process and pass through the human-computer interaction interface of software programming in enterprising line operate of system's remote data indicator and demonstration.

Referring to Fig. 2, when all kinds of device of pilot control inner chamber of car, come down to three variablees of fore-and-aft motion input: steering force F, manipulation displacement S, time t, by sensor the steering force F that operating control reflected is measured with manipulation displacement S, by capture card data are gathered via the different passages of setting, and analyze and handle by built-in computer system, real time data is projected on the time shaft, form real-time curve; If hyperchannel is gathered simultaneously, the set of real-time curve will be formed; Extract the typical curve collection of the vehicle of testing and assessing in the business data library file simultaneously, carry out the paired comparisons of real-time curve and typical curve then, judge both degrees of correlation, thereby finish evaluation the automobile inner chamber operating force comfort degree of this automobile product.

In concrete the enforcement; data collecting card selects to grind magnificent PCL-813 type data collecting card; this is a kind of 12 32 road A/D data collecting cards; can provide voltage protection to the input of every road analog quantity; be usually used in commercial measurement and monitoring; carry out data acquisition with this capture card, can satisfy the requirement of the unstable situation of the bigger grade of vibrations in the driving procedure.

Built-in computer system adopts truck-mounted computer mainboard and technical grade inner treater, and relevant auxiliary is determined by actual needs.

In concrete the enforcement, judge real-time curve and typical curve degree of correlation by calculating related coefficient, thus the method that automobile inner chamber operating force comfort degree is estimated, and its basis is the degree of correlation of calculating two stochastic variable collection.The method for building up of two stochastic variable collection related coefficients is:

If the data acquisition of real-time curve representative is: A={x ₁, x ₂..., x _i, i is the number of image data;

The data acquisition of bidding directrix curve representative is: $B=\{x_1^{\&prime;},{\mathrm{<figure-callout\; id="2"\; label="x"\; filenames="A200810246223E00101.png"\; state="\{\{state\}\}">x</figure-callout>}}_2^{\&prime;},\&CenterDot;\&CenterDot;\&CenterDot;,x_i^{\&prime;}\},$ I is the number of image data;

Then the data acquisition degree of correlation of two sets of curves representatives (promptly being the degree of correlation of two curves) is:

$\begin{array}{cc}\mathrm{\&rho;}(A,B)=\frac{\mathrm{\&Gamma;}(A,B)}{\sqrt{D\left(A\right)}\&CenterDot;\sqrt{D\left(B\right)}}& (0<\mathrm{\&rho;}<1)\end{array}$

Because the data set of typical curve is to handle to be archived in the business data library file afterwards, can directly call, therefore only need data set calculating corresponding calculated parameter by real-time curve, by above set:

The data acquisition of real-time curve representative is: A={x ₁, x ₂..., x _i}

Set up system of equations:

$\left\{\begin{array}{c}\mathrm{\&Gamma;}(A,B)=\mathrm{cov}[X\left(A\right),X\left(B\right)]=E\left[(X\left(A\right)-m\left(A\right))(X\left(B\right)-m\left(B\right))\right]\\ D\left(A\right)=E{[X\left(A\right)-m\left(A\right)]}^2\\ m\left(A\right)=\underset{a=0}{\overset{i}{\mathrm{\&Sigma;}}}{x}_a/i\\ m\left(B\right)=\underset{b=0}{\overset{i}{\mathrm{\&Sigma;}}}{x}_b/i\end{array}\right.$

By above equation solution obtain D (A), Γ (A B), goes out the degree of correlation coefficient in conjunction with D (B) is then computable:

$\begin{array}{cc}\mathrm{\&rho;}(A,B)=\frac{\mathrm{\&Gamma;}(A,B)}{\sqrt{D\left(A\right)}\&CenterDot;\sqrt{D\left(B\right)}}& (0<\mathrm{\&rho;}<1)\end{array}$

Because the possible set of values { ρ of related coefficient ρ ₁, ρ ₂..., ρ _n(n for test and appraisal number of times) strong preface constituting this attribute space of degree of correlation cuts apart class, belongs to which evaluation class so can adopt the degree of confidence criterion to discern ρ.Because the degree of confidence criterion is to consider from the angle of " by force ", think promptly that more " by force " is good more, and the class of " by force " should account for sizable ratio, and this definition with related coefficient itself also is consistent, promptly more near " 1 ", show that the degree of correlation is high more, therefore ρ value space is divided with inquartation in conjunction with actual tests: interval 1 is 0.75～1, and interval 2 is 0.5～0.75, and interval 3 is 0.25～0.5, interval 4 is 0～0.25, and Dui Ying comfort level evaluation collection is respectively: { C ₁, C ₂, C ₃, C ₄}={ is good, and be qualified, on the low side, too poor }.

Estimate between the graded region of set according to real-time curve and typical curve degree of correlation coefficient place, just can estimate the inner chamber operating force comfort degree of tested vehicle.

By test as can be known, system of the present invention good reproducibility, degree of accuracy height, utilize this system can realize to the inner chamber operating force comfort degree of automobile product fast, accurately, objective appraisal.

Claims (3)

1, automobile inner chamber operating force comfort degree evaluating system is characterized in that system's composition comprises:

Data acquisition system (DAS) adopts integrated setting, is by mould/number conversion data collecting card, acquisition channel, truck-mounted computer mainboard and comprises the vehicle carried data collecting device that the input-output unit of keyboard, display, interface constitutes;

Each external sensor, be provided for measuring in real time the acting force that the driver applies operating control in the inner chamber of car and the displacement sensor of acting force at each operating control that comprises clutch pedal, gas pedal, steering gear, hand brake handle, selector handle, voltage that collects with described external sensor or current analog signal are as the data acquisition sources of described data acquisition system (DAS);

Multichannel collecting is set the parallel interface data transfer path of computing machine by software, utilizes a plurality of data acquisition interfaces that different sensors is carried out data acquisition simultaneously.

2, a kind of method of carrying out the automobile inner chamber operating force comfort degree evaluation with the described system of claim 1, the real-time curve that it is characterized in that the shift value variation characteristic of acting force that the reflection driver that records with described system applies operating control in the inner chamber of car and acting force, compare with the typical curve of corresponding vehicle comfort level, carry out the evaluation of comfortableness degree with the degree of correlation of described real-time curve and typical curve.

3, automobile inner chamber operating force comfort degree evaluating system method according to claim 2 is characterized in that carrying out as follows:

A, set up typical curve: the matured product to the evaluation vehicle screens, selection reaches the product that comfort level requires, utilize described data acquisition system (DAS) to carry out data acquisition, choose a plurality of moment point in a period of time zone according to the actual requirements and form abscissa axis, try to achieve the mathematical expectation of data on each moment point of repeatedly gathering, mathematical expectation is projected on the formed time shaft of a plurality of moment point of evaluation time section as ordinate, draw the mathematical expectation curve of this vehicle handling comfort, according to manipulation of physical gained curve the mathematical expectation curve is revised, typical curve as in the later stage evaluation procedure deposits database in;

B, measurement real-time curve: utilize described data acquisition system (DAS) that the operating control in the tested vechicle driving process is carried out data acquisition, time with a period of time zone that evaluation procedure was consumed is horizontal ordinate, utilize data that this section collect in the period value for ordinate, with each constantly pairing data value as each pairing ordinate value constantly, each such coordinate points is projected in the coordinate system, form and estimate needed real-time curve.

C, judgement measured curve and typical curve degree of correlation:

Described measured curve and typical curve all are by data acquisition projection gained on the time shaft that changes, and can establish:

The data acquisition of measured curve representative is: A={x ₁, x ₂..., x _i, i is the number of image data;

The data acquisition of typical curve representative is: $B=\{x_1^{\&prime;},x_2^{\&prime;},\&CenterDot;\&CenterDot;\&CenterDot;,x_i^{\&prime;}\}$ , i is the number of image data;

The related coefficient of the data acquisition of two sets of curves representatives is:

$\begin{array}{cc}\mathrm{\&rho;}(A,B)=\frac{\mathrm{\&Gamma;}(A,B)}{\sqrt{D\left(A\right)}\&CenterDot;\sqrt{D\left(B\right)}}& (0<\mathrm{\&rho;}<1)\end{array}---\left(1\right)$

Correlation parameter is calculated as: D (A)=E[X (A)-m (A)] ²

D(B)＝E[X(B)-m(B)] ²

Γ(A，B)＝cov[X(A)，X(B)]＝E[(X(A)-m(A))(X(B)-m(B))]

Wherein, the element of X (A), X (B) expression data acquisition A, B, the mean value function of m (A), m (B) expression data acquisition A, B; The calculating of symbol " E " expression mathematical expectation;

With inquartation ρ value space is divided:

Interval 1: ρ is 0.75～1, and interval 2: ρ is 0.5～0.75,

Interval 3: ρ is 0.25～0.5, and interval 4: ρ is 0～0.25;

Set evaluation criterion: described interval 1～4 corresponding respectively comfort level evaluation collection is: { C ₁, C ₂, C ₃, C ₄}={ is good, and be qualified, on the low side, too poor };

Related coefficient ρ according to formula (1) is obtained utilizes described evaluation criterion, make and related coefficient ρ location between corresponding comfort level evaluation conclusion.

Images