CN102815291A - Device and method for checking brake system - Google Patents

Abstract

The invention discloses a device for checking a brake system, wherein the device comprises an acquirer, a calculator and a comparator, wherein the acquirer is used for acquiring the original data of the brake system, the calculator is used for calculating the original data depending on a preset calculating rule to obtain a calculating result, and the comparator is used for comparing the result which is calculated by the calculator with a preset comparison standard and for judging whether the original data is ineffective depending on the comparison result. The device for checking the brake system can automatically calculate various original data depending on a preset calculating rule, compare the calculating result with a comparison standard, and judge that the original data is ineffective in case that the comparison result fails to meet the preset condition or judge that the original data are effective when the comparison result meets the preset condition; and the device is short in calculation duration, short in checking cycle and high in checking efficiency.

Description

A kind of brake system is checked apparatus and method

Technical field

The invention belongs to the automobile design field, relate in particular to a kind of brake system and check apparatus and method.

Background technology

Along with the continuous development and progress of automotive technology, advanced brake system has obtained using widely on automobile.Brake system of car is to use on the automobile so that extraneous (mainly being the road surface) applies certain power in some part of automobile (mainly being vehicle); Thereby, generally comprise: drg, vacuum booster, master cylinder, brake pedal etc. its a series of special arrangements that carry out forced brake to a certain degree.

Braking safety in order to guarantee normal service brake and to lose efficacy; Need mate check to design-calculated car load brake system; Whether the parameters such as drg, vacuum booster, master cylinder and Parking lever ratio of checking in the brake system according to result of calculation satisfy the braking performance of vehicle target call; As the foundation of selecting suitable brake system parts, ensure the braking safety in the car load driving process with this.

It mainly is through manual calculation that the coupling check method is calculated in existing braking, and is that design value compares with result of calculation and standard of comparison, judges whether to adhere to specification.

But because the various original data that calculating needs are numerous and jumbled, manual calculation and the time that relatively needs in the long cycle that causes coupling to be checked are long, and error rate is higher.

Summary of the invention

In view of this, the object of the present invention is to provide a kind of brake system to check apparatus and method, can calculate, compare with design value various original data automatically, it be short to calculate required time, checks required cycle weak point, improves the check efficient of brake system.

A kind of brake system is checked device, comprising:

Getter is used to obtain the original data of said brake system;

Calculator is used for according to preset computation rule said original data being calculated;

Comparator is used for said calculator result calculated and preset standard of comparison are carried out matching ratio, according to the coupling comparative result, judges whether said original data lost efficacy.

Above-mentioned brake system is checked device, and preferred, said original data comprises:

Car load input parameter, drg parameter, braking during standstill parameter, brake pedal parameter, vacuum booster parameter, master brake cylinder parameter and brake hose parameter.

Above-mentioned brake system is checked device, and preferred, said comparator comprises:

Receiver module is used to receive the result of calculation of said calculator;

Comparison module is used for said result of calculation and preset standard of comparison are carried out matching ratio, when comparative result is pre-conditioned for not satisfying, judges said original data inefficacy, when comparative result satisfies when pre-conditioned, judges that said original data is effective.

Above-mentioned brake system is checked device, and preferred, said comparison module comprises:

Curve generates submodule, is used for generating appraisal curve according to said result of calculation;

The curve submodule that prestores is used to the calibrated curve that prestores and generate according to preset standard of comparison;

Judge submodule; Be used for said appraisal curve and said calibrated curve are carried out matching ratio, when comparative result is pre-conditioned for not satisfying, judge that said original data lost efficacy; When comparative result satisfies when pre-conditioned, judge that the original data that generates appraisal curve is effective.

Above-mentioned brake system is checked device, and is preferred, also comprises:

Display unit is used for compared result and shows.

Above-mentioned brake system is checked device, and is preferred, also comprises:

Annunciator is used for when judging that said original data lost efficacy, reporting to the police.

A kind of brake system check method comprises:

Obtain the original data of said brake system;

Computation rule according to preset calculates said original data;

Result calculated and preset standard of comparison are carried out matching ratio,, judge whether said original data lost efficacy according to the coupling comparative result.

Above-mentioned brake system check method, preferred, saidly carry out matching ratio according to result of calculation with preset standard of comparison and comprise:

Generate appraisal curve according to said result of calculation;

Said appraisal curve and the calibrated curve that generates according to preset standard of comparison are carried out matching ratio; When comparative result is pre-conditioned for not satisfying; Judge that said original data lost efficacy,, judge that the original data that generates appraisal curve is effective when comparative result satisfies when pre-conditioned.

Above-mentioned brake system check method, preferred, also comprise:

Compared result is showed.

Above-mentioned brake system check method, preferred, also comprise:

When judging that said original data lost efficacy, report to the police.

A kind of brake system provided by the invention is checked device and comprised: getter is used to obtain the original data of this brake system; Calculator is used for according to preset computation rule said original data being calculated result of calculation; Comparator is used for said calculator result calculated and preset standard of comparison are carried out matching ratio; According to the coupling comparative result, judge whether said original data lost efficacy.Adopt a kind of brake system provided by the invention to check device, can calculate various original data according to preset computation rule automatically, and result of calculation and standard of comparison are compared; When comparative result is pre-conditioned for not satisfying, judge that said original data lost efficacy, when comparative result is pre-conditioned for satisfying; Judge that said original data is effective; The calculating required time is short, and the check cycle is short, checks the efficient height.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the structural representation of certain pure electric automobile brake system provided by the invention;

Fig. 2 is the structural representation that a kind of brake system provided by the invention is checked device embodiment 1;

Fig. 3 is the concrete structure scheme drawing that a kind of brake system provided by the invention is checked device embodiment 1;

Fig. 4 is another concrete structure scheme drawing that a kind of brake system provided by the invention is checked device embodiment 1;

Fig. 5 is the characteristic curve scheme drawing that a kind of brake system provided by the invention is checked the vacuum booster of device embodiment 1;

Fig. 6 is under a kind of brake system provided by the invention sky of checking device embodiment 1, the full load conditions, the relation curve of ground attaching coefficient and brake efficiency;

Fig. 7 is the structural representation that a kind of brake system provided by the invention is checked device embodiment 2;

Fig. 8 be a kind of brake system provided by the invention check device embodiment 2 in the practical application scene, the page scheme drawing of curve plotting;

Fig. 9 is the diagram of circuit of the embodiment 1 of a kind of brake system check method provided by the invention;

Figure 10 is another diagram of circuit of the embodiment 1 of a kind of brake system check method provided by the invention;

Figure 11 is the diagram of circuit of the embodiment 2 of a kind of brake system check method provided by the invention.

The specific embodiment

For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer; To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiment of the invention is carried out clear, intactly description; Obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.

The present invention is applicable to the coupling calculating check of the brake system of automobile; In this application; Explain a kind of brake system provided by the invention for ocular and clear and check apparatus and method; Be to be example with certain pure electric automobile among the embodiment, brake system structure scheme drawing such as Fig. 1 comprise: drg, calculate hydraulic pressure regulator, vacuum booster, brake pedal, wheel speed sensors and calculating and check device; What heavy line was represented among the figure is brake hose, and wherein wheel speed sensors is used to measure the rotating speed of vehicle corresponding with it.

Its brake system mainly comprises the service brake emergency brake system of unifying.Hydraulic brake system is adopted in service brake, and the drg in this brake system is a drum brake mechanism behind the shroud; Vacuum booster is the band brake master cylinder arrangement; By vacuum pump vacuum servo is provided; Is furnished with ABS (Anti-lock Braking System, anti-lock braking system)+EBD (Electric Brakeforce Dis-tribution, electronic braking force distributes) function; Emergency brake system is the mechanical type manual effect and the back plate disc brake, adopts remote ratchet cable control mechanism.

In the exploitation of automobile; Need to calculate according to car load input parameter (wheelspan, wheelbase, height of center of mass etc.) earlier the braking force of the theory demands of this car; Adopt this combination cooresponding automobile actual braking force that can reach afterwards according to calculation of parameter such as the drg of reality, vacuum boosters then; Braking force to this actual braking force and theory demands compares; Judge whether this actual braking force satisfies the demand of theoretical braking force, and can the deceleration and stopping performance of this combination results satisfy the laws and regulations requirement of brake system.

Can be the theoretical parameter of development or start from the product design target in untapped stage still with the corresponding brake system parts of the demand of theoretical braking force parameter.The car load input parameter can be a car load design objective parameter, also can be the test parameters of competition vehicle.

Referring to Fig. 2, show the structural representation that a kind of brake system provided by the invention is checked device embodiment 1, can comprise: getter 101, calculator 102 and comparator 103.

Wherein, said getter 101 is used to obtain the original data of said brake system;

Said original data comprises:

Car load input parameter, drg parameter, braking during standstill parameter, brake pedal parameter, vacuum booster parameter, master brake cylinder parameter and brake hose parameter.

Wherein, the car load input parameter comprises: empty/fully loaded quality, and wheelbase, empty/fully loaded barycenter height, empty/fully loaded antero posterior axis axle load; Empty/as to be fully loaded with antero posterior axis to the barycenter horizontal throw, the front and back wheel theoretical running radius of tire, acceleration due to gravity, the front and back drg is effectively braked radius, the front and back braking efficiency factor; The front and back wheel cylinder diameter, front and back wheel-braking cylinder stroke, brake pedal lever ratio, brake pedal total travel, parking brake actuation device lever ratio; The brake-applying handle lever ratio, vacuum servo ratio, beginning power, jump value; Maximum power-assisted point input force, maximum power-assisted point power output, master brake cylinder diameter, master brake cylinder total kilometrage.

These original data are can experimentize to each element of forming this brake system in advance to obtain, and input is saved in the original data parameter database.When needs were checked this brake system, getter 101 directly obtained these original data from the original data parameter database.

Wherein, the vacuum booster parameter be the value vacuum booster input, output characteristic test figures, when preserving, be mutual cooresponding vector form with wherein each Parameters Transformation, be F like the input force of vacuum booster under a certain degree of vacuum _I1, F _I2, F _I3F _In, power output is F _O1, F _O2, F _O3F _On: converting the input force of vacuum booster and power output into mutual cooresponding vector form is: (F _I1, F _O1), (F _I2, F _O2), (F _I3, F _O3) ... (F _In, F _On).

In actual the enforcement; Can be through the stand test of vacuum booster band brake master cylinder; Obtain input, the output characteristic test figures of vacuum booster under a certain degree of vacuum; With each Parameters Transformation in the test figures is that mutual cooresponding vector form is stored in the raw data databases, is not limited to input, the output characteristic test figures that can only adopt stand test to obtain this vacuum booster certainly.

Comprise the data parameters such as drg parameter, vacuum booster parameter of the brake system that this is actual in these original data, they can reflect the actual conditions of this brake system.

Wherein, said calculator 102 is used for according to preset computation rule said original data being calculated;

Be preset with the computation rule that original data is carried out computing in the calculator 102, calculator 102 calculates original data according to this computation rule.Calculator 102 is according to waiting to check the original data of obtaining the calculating needs in the original data of type from getter 101; And the computation rule that will calculate target calculates the calculating target to the original data that acquires; Calculating target can be a plurality of; Each calculates the cooresponding computation rule of target and has formed computation rule preset in the calculator 102, and the original data that each calculates the cooresponding calculating of target needs is not quite similar, but all derives from the original data in the getter 101.

Because brake system is made up of the various structure parts, the check of brake system is comprised type various to be checked such as concern between check and each parts of different structure parts.To different types to be checked, the original data of searching each self-corresponding computation rule and relating to; According to this computation rule the original data that relates to is calculated then, waited to check the cooresponding result of calculation of type with movable difference, congress can carry out follow-up check.

Following casehistory, the concrete computation process of calculator 102 is following:

(1) respectively input, the output characteristic test figures of vacuum booster under the different degree of vacuum carried out the one dimension interpolation, obtain required vacuum booster input, output characteristic interpolated data.

Like the input of vacuum booster, input force and the power output that the output characteristic test figures is vacuum booster, stand test obtain original vacuum booster input force and power output for (500N, 2000N), (800N; 3000N), (1300N; 5500N), obtain input force and the power output that the vacuum booster input force is spaced apart a plurality of vacuum boosters of 500N, then can carry out the one dimension interpolation like present needs; Obtain a multiple spot input force, power output characteristic interpolated data is respectively (500N; 1872N), (1000N, 4092N), (1500N, 6311N).

(2) adopt the method for the one dimension interpolation that adopts with (1) similar,, obtain brake hose swell increment test figures according to the brake hose parameter.

(3) calculate empty, at full load is desirable and actual conditions under before and after brake braking force:

According to formula

${\mathrm{<figure-callout\; id="2"\; label="F\; u"\; filenames="HDA00001936879100031.png"\; state="\{\{state\}\}">F</figure-callout>}}_u=\frac{1}{2}[\frac{G}{{\mathrm{<figure-callout\; id="2"\; label="h\; g\; L"\; filenames="HDA00001936879100031.png"\; state="\{\{state\}\}">h</figure-callout>}}_g}\sqrt{L_{}^{}}\sqrt{{}_2^2+\frac{4h_g{L}_1}{G}{F}_{u1}}-(\frac{G{L}_2}{h_g}+2F_{u1})]---(1-1)$

Wherein, G is a complete vehicle weight, N; H is a height of gravitational center, the mm of unit (millimeter); L1 be front axle to centroid distance, the mm of unit (millimeter); L2 be rear axle to centroid distance, the mm of unit (millimeter); F _U1Be front axle braking force, the N of unit (newton); F _U2Be back axle braking force, the N of unit (newton); With F _U1With value uniformly-spaced, F _U11, F _U12, F _U13F _U1nThe above-mentioned formula of substitution is tried to achieve F _U2Value is respectively F _U21, F _U22, F _U23F _U2n, obtain the vector form (F that both form _U11, F _U21), (F _U12, F _U22), (F _U13, F _U23) ... (F _U1n, F _U2n).

Further, calculate front axle braking force and back axle braking force:

According to formula

F _u1=2*π*d12*P*r1*BEF1/4R （1-2）

Calculate front axle braking force;

According to formula

F _u2=2*π*d22*P*r2*BEF2/4R （1-3）

Calculate the back axle braking force.

Wherein, d12 is a front brake wheel cylinder diameter, the mm of unit (millimeter); D22 is a rear brake wheel cylinder diameter, the mm of unit (millimeter); P is a brake piping hydraulic pressure, units MPa (MPa); R1 is that front brake is effectively braked radius, the mm of unit (millimeter); R2 is that rear brake is effectively braked radius, the mm of unit (millimeter); BEF1 is a front wheel brake usefulness factor; BEF2 is the trailing wheel braking effectiveness factor; R is the front and back wheel theoretical running radius of tire, the mm of unit (millimeter).

Brake braking force partition ratio when calculating ABS+EBD system does not work:

β=Fu1/(Fu1+Fu2) （1-4）

According to above-mentioned formula (1-3) and front axle braking force that (1-4) calculates and back axle braking force calculating β value, and the F to calculate _U1Be initial value, with F _U1Value uniformly-spaced, F _U11, F _U12, F _U13F _U1nSubstitution (1-1) formula is tried to achieve F _U2Value is respectively F _U21, F _U22, F _U23F _U2n, obtain the vector form (F that both form _U11, F _U21), (F _U12, F _U22), (F _U13, F _U23) ... (F _U1n, F _U2n).

Calculate forward and backward axle respectively and utilize adhesion value:

According to formula Ψ f=L*zz* β/(L2+z*hg) (1-5)

Calculate front axle and utilize adhesion value;

According to formula Ψ r=L*z* (1-β)/(L1+z*hg) (1-6)

Calculate rear axle and utilize adhesion value.

Wherein, Ψ f is that front axle utilizes adhesion value; Ψ r is that rear axle utilizes adhesion value; Z is a rate of braking.

Rate of braking z is with same intervals value z1, z2, z3 ... Zn substitution following formula calculates forward and backward axle respectively and utilizes adhesion value.

Calculate forward and backward axle brake efficiency respectively:

According to formula F uf_E=(L1/L) * 100/ (β-Fuf*Hg/L) (1-7)

Calculate front axle brake efficient;

According to formula F ur_E=(L1/L) * 100/ (β-Fur*Hg/L) (1-8)

Calculate the rear axle brake efficiency.

Wherein, Fuf_E is a front axle brake efficient; Fur_E is the rear axle brake efficiency.

Calculate the relation between coefficient of road adhesion and braking deceleration and the stopping distance:

According to formula jmax=z*g (1-9)

Calculate braking deceleration;

According to formula S min=(τ 2'+ τ 2 "/2) * v/3.6+v2/ (25.92 * jmax) (1-10)

Calculated braking distance;

Wherein, v is an initial speed of braking; Jmax is a maximum braking deceleration, and τ 2 '+τ 2 ＂ are the in-service time of drg.

Calculate empty, fully loaded synchronizing adhesion coefficient respectively all less than 1, empty, fully loaded synchronizing adhesion coefficient is all greater than 1, and empty, fully loaded synchronizing adhesion coefficient is respectively less than 1 with greater than braking deceleration and corresponding stopping distance under 1 four kinds of situation.

Calculate brake-pipe pressure under the at full load 0.1g-1g deceleration/decel:

According to formula P=2* β * 0.8*z*m*g*R/ (3.14*d12*r1*BEF1) (1-11)

Calculate under the different braking intensity hydraulic pressure in sky, the actual front and back of the fully loaded brake piping, the hydraulic pressure in sky, the desirable front and back of the fully loaded brake piping.

(4) calculate braking deceleration and the stopping distance of braking under inefficacy of single tube road and the vacuum booster inefficacy respectively:

The vacuum booster power output formula that calculates under the different line pressures is:

F_OUT_F=P/η*pi*D_MC2/4 （1-12）

Before maximum power-assisted point, the input force under the different power outputs is:

F_in=(F_OUT_F-J(2))/i_bt+J(1)； （1-13）

After maximum power-assisted point, the input force under the different power outputs is:

F_in=F_OUT_F-(MAX(2)-MAX(1))。（1-14）

Wherein, η is a servo-unit conversion efficiency 0.98; D_MC is the master cylinder diameter; J (1) is beginning power; J (2) is the jump value; I_bt is the power-assisted ratio; MAX (1) is maximum power-assisted point input force; MAX (2) is maximum power-assisted point power output; Calculate braking deceleration and treadle effort under sky, the full load conditions respectively.

According to formula (1-9) (1-10) calculate when the ground adhesion value be 0.8 when being the adhesion value of normal asphalt coating, the braking rate of onset is 100km/h, the braking deceleration when lost efficacy in braking single tube road, and corresponding stopping distance.In the time of can obtaining the inefficacy of single tube road, deceleration/decel is the half the of normal deceleration/decel.

When servo-unit lost efficacy, the power output of vacuum booster equaled input force.(1-10) calculate according to formula (1-9) at initial speed of braking 100km/h, treadle effort 500N, the fully loaded hydraulic pressure of pipe line value when vacuum booster lost efficacy is calculated braking deceleration and the stopping distance of this moment according to formula.

(5) calculate wheel cylinder actual displacement, master cylinder volume, master cylinder traveled distance and treadle effort:

According to formula V=π * dm^2* σ/4 (1-15)

Calculate the front and rear wheel actual displacement respectively;

According to formula Vm=1.1 * 2 (V1+V2) (1-16)

Calculate the master cylinder volume;

According to formula S ₀=Vm* (π * dm ²/ 4) (1-17)

Calculate the master cylinder traveled distance;

According to formula L _p=k _p[S ₀+ 2] (1-18)

Pedal stroke when the calculating hydraulic pressure of pipe line is 12MPa.

When the ground adhesion value is 0.8, according to formula $F_F=\frac{\mathrm{\&pi;}}{4}\&CenterDot;{D^2}_m\&CenterDot;p\&CenterDot;\frac{1}{\mathrm{Kp}\&CenterDot;\mathrm{\&eta;}}---(1-19)$ When calculating vacuum booster and losing efficacy, promptly do not have vacuum servo than the time different hydraulic pressure of pipe line values cooresponding treadle efforts;

When the ground adhesion value is 0.8, according to formula F _P=F _FThe cooresponding treadle effort of different hydraulic pressure of pipe line values when/is (1-20) calculating vacuum booster is effective.

Wherein, V1, V2 are respectively front and back wheel cylinder working volume; Vm is the master cylinder volume; S0 is a master cylinder real work stroke; Kp is the brake pedal ratio; Lp is a pedal real work stroke; η is a pedal machines efficient; Is is the vacuum servo ratio.

(6) calculating limit is stayed sloping ability and is stayed sloping maximum grip power:

According to formula

Calculate automobile and on uphill road, park the possible slope that Shi Suoneng stops;

According to formula

Calculate automobile and on the downhill path, park the possible slope that Shi Suoneng stops;

And calculate the unloaded upgrade of adhesion value decision, fully loaded upgrade, unloaded descending slope and fully loaded descending slope;

According to formula

Calculate Parking bar handle power.

Wherein, F _HandBe braking during standstill bar handle power; i ₀Be braking during standstill bar handle lever ratio; i _zBe Parking drag-line back segment lever ratio; η is a braking during standstill drag-line mechanical efficiency; α is the Parking angle; K is the efficiency factor of rear brake; R _BrBraking radius for rear brake.

Wherein, said comparator 103 is used for said calculator 102 result calculated and preset standard of comparison are carried out matching ratio, according to the coupling comparative result, judges whether said original data lost efficacy.

Referring to a concrete structure scheme drawing shown in Figure 3, said comparator 103 comprises: receiver module 1031 and comparison module 1032.

Wherein, said receiver module 1031 is used to receive the result of calculation of said calculator 102;

Receiver module 1031 receives each result of calculation that calculator 102 calculates.

Comparison module 1032 is used for said result of calculation and preset standard of comparison are carried out matching ratio; When comparative result is pre-conditioned for not satisfying; Judge that said original data lost efficacy,, judge that the original data that generates appraisal curve is effective when comparative result satisfies when pre-conditioned.

Be preset with in the comparison module and the corresponding standard of comparison of each computational item result of calculation that to be foundation obtain with the corresponding brake system parts of the demand of theoretical braking force parameter; Each result of calculation and standard of comparison corresponding with it are compared, and each standard of comparison can be number range or curve ranges.

The standard of comparison that provides in the present embodiment comprises number range and curve ranges.

Referring to another concrete structure scheme drawing shown in Figure 4, said comparison module 1032 comprises: data comparison sub-module 10321, curve generate prestore submodule 10323 and curve curve of submodule 10322, curve and judge submodule 10324.

Wherein, Said data comparison sub-module 10321 is used for carrying out matching ratio according to the numerical value of the numerical value of result of calculation and preset standard of comparison; When comparative result is pre-conditioned for not satisfying; Judge that said original data lost efficacy,, judge that the original data that generates result of calculation is effective when comparative result satisfies when pre-conditioned;

Pre-conditioned is exactly that the numerical difference between of numerical value and the preset standard of comparison of result of calculation satisfies preset range, and when this difference satisfied preset range, comparative result was pre-conditioned for satisfying, otherwise, satisfied.

Wherein with use the corresponding result of calculation of standard of comparison that number range compares and comprise:

At initial speed of braking 100km/h, during treadle effort 500N, fully loaded hydraulic pressure of pipe line value, braking deceleration and stopping distance when vacuum booster lost efficacy;

The master cylinder traveled distance;

The cooresponding treadle effort of different braking deceleration/decel;

The unloaded upgrade of adhesion value decision, fully loaded upgrade, unloaded descending slope and fully loaded descending slope;

Require numerical value to meet the regulation of GB GB12676-1999.

Parking bar handle power.

Regulation according to GB7258-2004: braking during standstill should be through pure mechanical device the working part locking, and chaufeur puts on the power on the operating control: during hand operation, manned vehicle should be greater than 400N.Regulation according to GB12676-1999: braking during standstill is a hand-guided, its control effort: M1 class car is no more than 400N.

When each above-mentioned result of calculation all satisfied the number range with its corresponding preset, this numerical value was checked part and is satisfied condition, and cooresponding original data is valid data.

The standard of comparison of remaining result of calculation application curves scope.

Wherein, said curve generation submodule 10322 is used for generating appraisal curve according to said result of calculation;

Specifically comprise:

(1) input, output characteristic test figures and the difference data according to vacuum booster generates vacuum booster input, output characteristic curve;

With the input force of vacuum booster as abscissa, power output as ordinate, draw input, the output characteristic curve of vacuum booster under the different degree of vacuum.

(2) adopt the method that adopts with (1) similar, generate the swell increment-hydraulic pressure of pipe line curve of brake hose according to brake hose swell increment test figures;

(3) distribution curve of the generation off-line and the front and back brake braking force of reality;

According to formula

${\mathrm{<figure-callout\; id="2"\; label="F\; u"\; filenames="HDA00001936879100031.png"\; state="\{\{state\}\}">F</figure-callout>}}_u=\frac{1}{2}[\frac{G}{{\mathrm{<figure-callout\; id="2"\; label="h\; g\; L"\; filenames="HDA00001936879100031.png"\; state="\{\{state\}\}">h</figure-callout>}}_g}\sqrt{L_{}^{}}\sqrt{{}_2^2+\frac{4h_g{L}_1}{G}{F}_{u1}}-(\frac{G{L}_2}{h_g}+2F_{u1})]---(1-1)$

With value F uniformly-spaced _U1Calculate cooresponding F respectively _U2Value, vector form (F _U11, F _U21), (F _U12, F _U22), (F _U13, F _U23) ... (F _U1n, F _U2n) coordinate points, draw empty, fully loaded ideal I curve respectively.

Further, draw empty, fully loaded desirable beta curve according to formula (1-4).

Forward and backward axle according to calculating utilizes adhesion value, generates and utilizes adhesion value and rate of braking relation curve;

Utilize adhesion value according to formula (1-5) and the forward and backward axle that (1-6) calculates respectively, draw out rate of braking z and the relation curve that utilizes adhesion value.

Forward and backward axle brake efficiency according to calculating is created under sky, the full load conditions relation curve of ground attaching coefficient and brake efficiency;

According to calculating empty, fully loaded synchronizing adhesion coefficient respectively all less than 1; Empty, fully loaded synchronizing adhesion coefficient is all greater than 1; Empty, fully loaded synchronizing adhesion coefficient generates braking deceleration and stopping distance curve under the Different Ground adhesion value respectively less than 1 with greater than braking deceleration that obtains under 1 four kinds of situation and corresponding stopping distance;

Under the different braking intensity that calculates; Hydraulic pressure in sky, the actual front and back of the fully loaded brake piping; Hydraulic pressure in sky, the desirable front and back of the fully loaded brake piping, the hydraulic pressure under generation sky, the full load conditions in the front and back brake piping of ideal and reality and the relation curve of rate of braking.

(4) according to the sky, the braking deceleration under the full load conditions and the treadle effort that calculate, the relation curve of braking deceleration and brake pedal force under generation sky, the full load conditions.

Like Fig. 5, show the characteristic curve scheme drawing of vacuum booster, input, the output characteristic curve of vacuum booster under the promptly different degree of vacuum;

This figure is to be abscissa with the input force, and output hydraulic pressure is ordinate.

Like Fig. 6, show under sky, the full load conditions relation curve of ground attaching coefficient and brake efficiency;

This figure is to be abscissa with the rate of braking, utilizes adhesion value to be ordinate.

In actual the enforcement, can adopt the MATLAB drawing instrument to draw, but be not limited to this, also can adopt other drawing instrument.

Wherein, the said curve calibrated curve that submodule 10323 is used to prestore and generates according to preset standard of comparison that prestores;

Each curve that generates submodule 10322 generations with curve is corresponding; The said curve submodule 1032 that prestores prestores the calibrated curve that generates according to preset standard of comparison; These calibrated curves are the curve that car load design objective parameter or the test parameters of competition vehicle in the development and Design process generates, the standard of the curve that generates for each parameter according to this brake system.

Wherein, Said curve judges that submodule 10324 is used for said appraisal curve and said calibrated curve are carried out matching ratio, when comparative result is pre-conditioned for not satisfying, judges that said original data lost efficacy; When comparative result satisfies when pre-conditioned, judge that said original data is effective.

Curve is generated appraisal curve that submodule 10322 generates according to each result of calculation and curve prestore that cooresponding calibrated curve carries out matching ratio in the submodule 10323; When all appraisal curves all satisfied the curve ranges of calibrated curve cooresponding with it, the cooresponding original data of this appraisal curve was valid data.

And when number range comparison or curve ranges relatively in; When the appraisal curve that arbitrary result of calculation number range or result of calculation satisfied and its corresponding preset generate does not satisfy the curve ranges of calibrated curve cooresponding with it; The original data of this brake system all lost efficacy; Promptly this brake system does not meet design requirement, and need change one group of original data again, calculates check again.

From the above; A kind of brake system that present embodiment 1 provides is checked device and is comprised: getter, calculator and comparator; Getter obtains the original data of this brake system, and calculator calculates result of calculation according to preset computation rule to said original data, and comparator carries out matching ratio with said calculator result calculated and preset standard of comparison; According to the coupling comparative result, judge whether said original data lost efficacy.Adopt a kind of brake system that provides in this enforcement to check device and carry out the check of brake system, it is short to calculate required time, and the check cycle is short, and check efficient is high.

Show the structural representation that a kind of brake system provided by the invention is checked device embodiment 2 referring to Fig. 7, said device also comprises in structure shown in Figure 2: display unit 104 and annunciator 105.

Wherein, said display unit 104 is used for compared result and shows;

Show for compared result more intuitively, be provided with display unit 104 specially, but the display area compared result comprises that numerical value comparative result and curve comparative result show in the display unit 104.

Like Fig. 8, show in the practical application scene page scheme drawing of curve plotting.

This page comprises: graph area, rules district, computational item and result of calculation district.

Graph area is used to show the curve and the calibrated curve of drafting;

The rules district is used to show each and uses the standard of comparison of number range;

Computational item is used to show the kind of original data;

The result of calculation district is used for showing calculates the result of calculation that obtains according to original data.

Said annunciator 105 is used for when judging that said original data lost efficacy, reporting to the police.

When number range comparison or curve ranges relatively in; When the appraisal curve that arbitrary result of calculation number range or result of calculation satisfied and its corresponding preset generate does not satisfy the curve ranges of calibrated curve cooresponding with it; The original data of this brake system all lost efficacy; Promptly this brake system does not meet design requirement, and annunciator 105 sends alerting signal promptings such as buzzing or flash of light.

From the above, a kind of brake system that provides of present embodiment 2 is checked device and is also comprised: display unit and annunciator.But the display unit compared result comprises numerical value comparative result and curve comparative result and shows.When judging that original data lost efficacy, annunciator sends this group original data of alerting signal prompting and lost efficacy.

Corresponding with above-mentioned a kind of brake system check device embodiment, the embodiment of a kind of brake system check method that the present invention also provides.

Referring to Fig. 9, show the diagram of circuit of a kind of embodiment 1 of brake system check method, comprising:

Step S101: the original data of obtaining said brake system;

Original data is each element of forming this brake system to be experimentized to obtain in advance, and is input in the original data parameter database.When needs are checked this brake system, directly from the original data parameter database, obtain these original data.

In actual the enforcement; Can be through the stand test of vacuum booster band brake master cylinder; Obtain input, the output characteristic test figures of vacuum booster under a certain degree of vacuum; With each Parameters Transformation in the test figures is that mutual cooresponding vector form is stored in the raw data databases, can only adopt stand test to obtain data but be not limited to.

Comprise the data parameters of the actual drg, vacuum booster etc. of this brake system in these original data, they can reflect the actual conditions of this brake system.

Step S102: the computation rule according to preset calculates said original data;

Be preset with the computation rule that original data is carried out computational analysis in the calculator 102, calculator 102 calculates original data according to this computation rule.Calculator 102 is according to calculating the original data of obtaining the calculating needs in the original data of target from getter 101; And the computation rule that will calculate target calculates the calculating target to the original data that acquires; Calculating target can be a plurality of; Each calculates the cooresponding computation rule of target and has formed computation rule preset in the calculator 102, and the original data that each calculates the cooresponding calculating of target needs is not quite similar, but all derives from the original data in the getter 101.

Following casehistory, the concrete computation process of step S102 is following:

(1) respectively input, the output characteristic test figures of vacuum booster under the different degree of vacuum carried out the one dimension interpolation, obtain required vacuum booster input, output characteristic interpolated data.

Like the input of vacuum booster, input force and the power output that the output characteristic test figures is vacuum booster, stand test obtain original vacuum booster input force and power output for (500N, 2000N), (800N; 3000N), (1300N; 5500N), obtain input force and the power output that the vacuum booster input force is spaced apart a plurality of vacuum boosters of 500N, then can carry out the one dimension interpolation like present needs; Obtain a multiple spot input force, power output characteristic interpolated data is respectively (500N; 1872N), (1000N, 4092N), (1500N, 6311N).

(2) adopt the method for the one dimension interpolation that adopts with (1) similar,, obtain brake hose swell increment test figures according to the brake hose parameter.

(3) calculate empty, at full load is desirable and actual conditions under before and after brake braking force:

According to formula

${\mathrm{<figure-callout\; id="2"\; label="F\; u"\; filenames="HDA00001936879100031.png"\; state="\{\{state\}\}">F</figure-callout>}}_u=\frac{1}{2}[\frac{G}{{\mathrm{<figure-callout\; id="2"\; label="h\; g\; L"\; filenames="HDA00001936879100031.png"\; state="\{\{state\}\}">h</figure-callout>}}_g}\sqrt{L_{}^{}}\sqrt{{}_2^2+\frac{4h_g{L}_1}{G}{F}_{u1}}-(\frac{G{L}_2}{h_g}+2F_{u1})]---(2-1)$

Wherein, G is a complete vehicle weight, N; H is a height of gravitational center, the mm of unit (millimeter); L1 be front axle to centroid distance, the mm of unit (millimeter); L2 be rear axle to centroid distance, the mm of unit (millimeter); F _U1Be the required brake braking force of front axle, the N of unit (newton); F _U2Be the required brake braking force of rear axle, the N of unit (newton); With F _U1With value uniformly-spaced, F _U11, F _U12, F _U13F _U1nThe above-mentioned formula of substitution is tried to achieve F _U2Value is respectively F _U21, F _U22, F _U23F _U2n, obtain the vector form (F that both form _U11, F _U21), (F _U12, F _U22), (F _U13, F _U23) ... (F _U1n, F _U2n).

Further, calculate front axle braking force and back axle braking force:

According to formula

F _u1=2*π*d12*P*r1*BEF1/4R （2-2）

Calculate front axle braking force;

According to formula

F _u2=2*π*d22*P*r2*BEF2/4R （2-3）

Calculate the back axle braking force.

Wherein, d12 is a front brake wheel cylinder diameter, the mm of unit (millimeter); D22 is a rear brake wheel cylinder diameter, the mm of unit (millimeter); P is a brake piping hydraulic pressure, units MPa (MPa); R1 is that front brake is effectively braked radius, the mm of unit (millimeter); R2 is that rear brake is effectively braked radius, the mm of unit (millimeter); BEF1 is a front wheel brake usefulness factor; BEF2 is the trailing wheel braking effectiveness factor; R is the front and back wheel theoretical running radius of tire, the mm of unit (millimeter).

Brake braking force partition ratio when calculating ABS+EBD system does not work:

β=Fu1/(Fu1+Fu2) （2-4）

According to above-mentioned formula (2-3) and front axle braking force that (2-4) calculates and back axle braking force calculating β value, and the F to calculate _U1Be initial value, with F _U1Value uniformly-spaced, F _U11, F _U12, F _U13F _U1nSubstitution (2-1) formula is tried to achieve F _U2Value is respectively F _U21, F _U22, F _U23F _U2n, obtain the vector form (F that both form _U11, F _U21), (F _U12, F _U22), (F _U13, F _U23) ... (F _U1n, F _U2n).

Calculate forward and backward axle respectively and utilize adhesion value:

According to formula Ψ f=L*z* β/(L2+z*hg) (2-5)

Calculate front axle and utilize adhesion value;

According to formula Ψ r=L*z* (1-β)/(L1+z*hg) (2-6)

Calculate rear axle and utilize adhesion value.

Wherein, Ψ f is that front axle utilizes adhesion value; Ψ r is that rear axle utilizes adhesion value; Z is a rate of braking.

Rate of braking z is with same intervals value z1, z2, z3 ... Zn substitution following formula calculates forward and backward axle respectively and utilizes adhesion value.

Calculate forward and backward axle brake efficiency respectively:

According to formula F uf_E=(L1/L) * 100/ (β-Fuf*Hg/L) (2-7)

Calculate front axle brake efficient;

According to formula F ur_E=(L1/L) * 100/ (β-Fur*Hg/L) (2-8)

Calculate the rear axle brake efficiency.

Wherein, Fuf_E is a front axle brake efficient; Fur_E is the rear axle brake efficiency.

Calculate the relation between coefficient of road adhesion and braking deceleration and the stopping distance:

According to formula jmax=z*g (2-9)

Calculate braking deceleration;

According to formula S min=(τ 2'+ τ 2 ＂/2) * v/3.6+v2/ (25.92 * jmax) (2-10)

Calculated braking distance;

Wherein, v is an initial speed of braking; Jmax is a maximum braking deceleration, and τ 2 '+τ 2 ＂ are the in-service time of drg.

Calculate empty, fully loaded synchronizing adhesion coefficient respectively all less than 1, empty, fully loaded synchronizing adhesion coefficient is all greater than 1, and empty, fully loaded synchronizing adhesion coefficient is respectively less than 1 with greater than braking deceleration and corresponding stopping distance under 1 four kinds of situation.

Calculate brake-pipe pressure under the at full load 0.1g-1g deceleration/decel:

According to formula P=2* β * 0.8*z*m*g*R/ (3.14*d12*r1*BEF1) (2-11)

Calculate under the different braking intensity hydraulic pressure in sky, the actual front and back of the fully loaded brake piping, the hydraulic pressure in sky, the desirable front and back of the fully loaded brake piping.

(4) calculate braking deceleration and the stopping distance of braking under inefficacy of single tube road and the vacuum booster inefficacy respectively:

The vacuum booster power output formula that calculates under the different line pressures is:

F_OUT_F=P/η*pi*D_MC2/4 （2-12）

Before maximum power-assisted point, the input force under the different power outputs is:

F_in=(F_OUT_F-J(2))/i_bt+J(1)； （2-13）

After maximum power-assisted point, the input force under the different power outputs is:

F_in=F_OUT_F-(MX(2)-MAX(1))。（2-14）

Wherein, η is a servo-unit conversion efficiency 0.98; D_MC is the master cylinder diameter; J (1) is beginning power; J (2) is the jump value; I_bt is the power-assisted ratio; MAX (1) is maximum power-assisted point input force; MAX (2) is maximum power-assisted point power output; Calculate braking deceleration and treadle effort under sky, the full load conditions respectively.

According to formula (1-9) (1-10) calculate when the ground adhesion value be 0.8 when being the adhesion value of normal asphalt coating, the braking rate of onset is 100km/h, the braking deceleration when lost efficacy in braking single tube road, and corresponding stopping distance.In the time of can obtaining the inefficacy of single tube road, deceleration/decel is the half the of normal deceleration/decel.

When servo-unit lost efficacy, the power output of vacuum booster equaled input force.(1-10) calculate according to formula (1-9) at initial speed of braking 100km/h, treadle effort 500N, the fully loaded hydraulic pressure of pipe line value when vacuum booster lost efficacy is calculated braking deceleration and the stopping distance of this moment according to formula.

(5) calculate wheel cylinder actual displacement, master cylinder volume, master cylinder traveled distance and treadle effort:

According to formula V=π * dm^2* σ/4 (2-15)

Calculate the front and rear wheel actual displacement respectively;

According to formula Vm=1.1 * 2 (V1+V2) (2-16)

Calculate the master cylinder volume;

According to formula S ₀=Vm* (π * dm ²/ 4) (2-17)

Calculate the master cylinder traveled distance;

According to formula L _p=k _p[S ₀+ 2] (2-18)

Pedal stroke when the calculating hydraulic pressure of pipe line is 12MPa.

When the ground adhesion value is 0.8, according to formula $F_F=\frac{\mathrm{\&pi;}}{4}\&CenterDot;{D^2}_m\&CenterDot;p\&CenterDot;\frac{1}{\mathrm{Kp}\&CenterDot;\mathrm{\&eta;}}---(2-19)$

When calculating vacuum booster and losing efficacy, promptly do not have vacuum servo than the time different hydraulic pressure of pipe line values cooresponding treadle efforts;

When the ground adhesion value is 0.8, according to formula F _P=F _FThe cooresponding treadle effort of different hydraulic pressure of pipe line values when/is (1-20) calculating vacuum booster is effective.

Wherein, V1, V2 are respectively front and back wheel cylinder working volume; Vm is the master cylinder volume; S0 is a master cylinder real work stroke; Kp is the brake pedal ratio; Lp is a pedal real work stroke; η is a pedal machines efficient; Is is the vacuum servo ratio.

(6) calculating limit is stayed sloping ability and is stayed sloping maximum grip power:

According to formula

Calculate automobile and on uphill road, park the possible slope that Shi Suoneng stops;

According to formula

Calculate automobile and on the downhill path, park the possible slope that Shi Suoneng stops;

And calculate the unloaded upgrade of adhesion value decision, fully loaded upgrade, unloaded descending slope and fully loaded descending slope;

According to formula

Calculate Parking bar handle power.

Wherein, F _HandBe braking during standstill bar handle power; i ₀Be braking during standstill bar handle lever ratio; i _zBe Parking drag-line back segment lever ratio; η is a braking during standstill drag-line mechanical efficiency; α is the Parking angle; K is the efficiency factor of rear brake; R _BrBraking radius for rear brake.

Step S103: result calculated and preset standard of comparison are carried out matching ratio,, judge whether said original data lost efficacy according to the coupling comparative result.

Be preset with and the corresponding standard of comparison of each computational item, each result of calculation and standard of comparison corresponding with it are compared, each standard of comparison can be numerical value or number range, curve or curve ranges.

The standard of comparison that provides in the present embodiment comprises number range and curve ranges.

Referring to Figure 10, show another diagram of circuit of a kind of embodiment 1 of brake system check method, said step S103 specifically comprises:

Step S1031: the numerical value according to the numerical value of result of calculation and preset standard of comparison carries out matching ratio; When comparative result is pre-conditioned for not satisfying; Judge that said original data lost efficacy,, judge that the original data that generates result of calculation is effective when comparative result satisfies when pre-conditioned;

Pre-conditioned is exactly that the numerical difference between of numerical value and the preset standard of comparison of result of calculation satisfies preset range, and when this difference satisfied preset range, comparative result was pre-conditioned for satisfying, otherwise, satisfied.

The result of calculation of wherein using the standard of comparison of number range comprises:

At initial speed of braking 100km/h, treadle effort 500N, the fully loaded hydraulic pressure of pipe line value when vacuum booster lost efficacy is calculated braking deceleration and the stopping distance of this moment according to formula;

The master cylinder traveled distance;

The cooresponding treadle effort of different braking deceleration/decel;

Calculate the unloaded upgrade of adhesion value decision, fully loaded upgrade, unloaded descending slope and fully loaded descending slope;

Require numerical value to meet the regulation of GB GB12676-1999.

Parking bar handle power.

Regulation according to GB7258-2004: braking during standstill should be through pure mechanical device the working part locking, and chaufeur puts on the power on the operating control: during hand operation, manned vehicle should be greater than 400N.Regulation according to GB12676-1999: braking during standstill is a hand-guided, its control effort: M1 class car is no more than 400N.

When each above-mentioned result of calculation all satisfied the number range with its corresponding preset, this numerical value was checked part and is satisfied condition, and cooresponding original data is valid data.

The standard of comparison of remaining result of calculation application curves scope.

Step S1032: generate appraisal curve according to said result of calculation;

Specifically comprise:

(1) input, output characteristic test figures and the difference data according to vacuum booster generates vacuum booster input, output characteristic curve;

With the input force of vacuum booster as abscissa, power output as ordinate, draw input, the output characteristic curve of vacuum booster under the different degree of vacuum.

(2) adopt the method that adopts with (1) similar, generate the swell increment-hydraulic pressure of pipe line curve of brake hose according to brake hose swell increment test figures;

(3) distribution curve of the generation off-line and the front and back brake braking force of reality;

According to formula

${\mathrm{<figure-callout\; id="2"\; label="F\; u"\; filenames="HDA00001936879100031.png"\; state="\{\{state\}\}">F</figure-callout>}}_u=\frac{1}{2}[\frac{G}{{\mathrm{<figure-callout\; id="2"\; label="h\; g\; L"\; filenames="HDA00001936879100031.png"\; state="\{\{state\}\}">h</figure-callout>}}_g}\sqrt{L_{}^{}}\sqrt{{}_2^2+\frac{4h_g{L}_1}{G}{F}_{u1}}-(\frac{G{L}_2}{h_g}+2F_{u1})]---(2-1)$

With value F uniformly-spaced _U1Calculate cooresponding F respectively _U2Value, vector form (F _U11, F _U21), (F _U12, F _U22), (F _U13, F _U23) ... (F _U1n, F _U2n) coordinate points, draw empty, fully loaded ideal I curve respectively.

Further, draw empty, fully loaded desirable beta curve according to formula (2-4).

Forward and backward axle according to calculating utilizes adhesion value, generates and utilizes adhesion value and rate of braking relation curve;

Utilize adhesion value according to formula (2-5) and the forward and backward axle that (2-6) calculates respectively, draw out rate of braking z and the relation curve that utilizes adhesion value.

Forward and backward axle brake efficiency according to calculating is created under sky, the full load conditions relation curve of ground attaching coefficient and brake efficiency;

According to calculating empty, fully loaded synchronizing adhesion coefficient respectively all less than 1; Empty, fully loaded synchronizing adhesion coefficient is all greater than 1; Empty, fully loaded synchronizing adhesion coefficient generates braking deceleration and stopping distance curve under the Different Ground adhesion value respectively less than 1 with greater than braking deceleration that obtains under 1 four kinds of situation and corresponding stopping distance;

Under the different braking intensity that calculates; Hydraulic pressure in sky, the actual front and back of the fully loaded brake piping; Hydraulic pressure in sky, the desirable front and back of the fully loaded brake piping, the hydraulic pressure under generation sky, the full load conditions in the front and back brake piping of ideal and reality and the relation curve of rate of braking.

(4) according to the sky, the braking deceleration under the full load conditions and the treadle effort that calculate, the relation curve of braking deceleration and brake pedal force under generation sky, the full load conditions.

In actual the enforcement, can adopt the MATLAB drawing instrument to draw, but be not limited to this, also can adopt other drawing instrument.

Step S1033: said appraisal curve and the calibrated curve that generates according to preset standard of comparison are carried out matching ratio; When comparative result is pre-conditioned for not satisfying; Judge that said original data lost efficacy,, judge that the original data that generates appraisal curve is effective when comparative result satisfies when pre-conditioned.

The appraisal curve and the cooresponding calibrated curve that generate according to each result of calculation carry out matching ratio, and when all appraisal curves all satisfied the curve ranges of calibrated curve cooresponding with it, the cooresponding original data of this appraisal curve was valid data.

And when number range comparison or curve ranges relatively in; When the appraisal curve that arbitrary result of calculation number range or result of calculation satisfied and its corresponding preset generate does not satisfy the curve ranges of calibrated curve cooresponding with it; The original data of this brake system all lost efficacy; Promptly this brake system does not meet design requirement, and need change one group of original data again, calculates check again.

From the above, a kind of brake system check method of providing of present embodiment 1 comprises: the original data of obtaining said brake system; Computation rule according to preset calculates said original data; Result calculated and preset standard of comparison are carried out matching ratio,, judge whether said original data lost efficacy according to the coupling comparative result.Adopt a kind of brake system check method that provides in this enforcement to carry out the check of brake system, it is short to calculate required time, and the check cycle is short, checks the efficient height.

Referring to Figure 11, show the diagram of circuit of a kind of embodiment 2 of brake system check method, after step S103, also comprise:

Step S104: compared result is showed;

Show for compared result more intuitively, be provided with display unit 104 specially, but the display area compared result comprises that numerical value comparative result and curve comparative result show in the display unit 104.

Step S105: when judging that said original data lost efficacy, report to the police.

When number range comparison or curve ranges relatively in; When the appraisal curve that arbitrary result of calculation number range or result of calculation satisfied and its corresponding preset generate does not satisfy the curve ranges of calibrated curve cooresponding with it; The original data of this brake system all lost efficacy; Promptly this brake system does not meet design requirement, and sends alerting signal promptings such as buzzing or flash of light.

From the above, a kind of brake system check method of providing of present embodiment 2 also comprises: compared result comprises that numerical value comparative result and curve comparative result show; When judging that original data lost efficacy, send this group original data of alerting signal prompting and lost efficacy.

Ground attaching coefficient in the embodiment of the invention is 0.8, but is not limited to this, and in actual the enforcement, this ground attaching coefficient can be according to actual conditions value between 0 ~ 1.

Alerting signal in the embodiment of the invention is buzzing or flash of light, but is not limited to this, also can adopt other type of alarm in actual the enforcement.

First compared result is showed in the embodiment of the invention, and then when judging that said original data lost efficacy, reports to the police, and sequencing is not limited to this, also can be to report to the police earlier in actual the enforcement and afterwards shows, perhaps carries out simultaneously.

The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.

Claims (10)

1. a brake system is checked device, it is characterized in that, comprising:

Getter is used to obtain the original data of said brake system;

Calculator is used for according to preset computation rule said original data being calculated;

Comparator is used for said calculator result calculated and preset standard of comparison are carried out matching ratio, according to the coupling comparative result, judges whether said original data lost efficacy.

2. brake system according to claim 1 is checked device, it is characterized in that said original data comprises:

Car load input parameter, drg parameter, braking during standstill parameter, brake pedal parameter, vacuum booster parameter, master brake cylinder parameter and brake hose parameter.

3. brake system according to claim 1 is checked device, it is characterized in that said comparator comprises:

Receiver module is used to receive the result of calculation of said calculator;

Comparison module is used for said result of calculation and preset standard of comparison are carried out matching ratio, when comparative result is pre-conditioned for not satisfying, judges said original data inefficacy, when comparative result satisfies when pre-conditioned, judges that said original data is effective.

4. brake system according to claim 3 is checked device, it is characterized in that said comparison module comprises:

Numerical value is judged submodule; Be used for carrying out matching ratio, when comparative result is pre-conditioned for not satisfying, judge said original data inefficacy according to the numerical value of the numerical value of result of calculation and preset standard of comparison; When comparative result satisfies when pre-conditioned, judge that the original data that generates result of calculation is effective;

Curve generates submodule, is used for generating appraisal curve according to result of calculation;

The curve submodule that prestores is used to the calibrated curve that prestores and generate according to preset standard of comparison;

Curve is judged submodule; Be used for said appraisal curve and said calibrated curve are carried out matching ratio, when comparative result is pre-conditioned for not satisfying, judge that said original data lost efficacy; When comparative result satisfies when pre-conditioned, judge that the original data that generates appraisal curve is effective.

5. brake system according to claim 1 is checked device, it is characterized in that, also comprises:

Display unit is used for compared result and shows.

6. brake system according to claim 1 is checked device, it is characterized in that, also comprises:

Annunciator is used for when judging that said original data lost efficacy, reporting to the police.

7. a brake system check method is characterized in that, comprising:

Obtain the original data of said brake system;

Computation rule according to preset calculates said original data;

Result calculated and preset standard of comparison are carried out matching ratio,, judge whether said original data lost efficacy according to the coupling comparative result.

8. brake system check method according to claim 7 is characterized in that, saidly carries out matching ratio according to result of calculation with preset standard of comparison and comprises:

Numerical value according to the numerical value of result of calculation and preset standard of comparison carries out matching ratio; When comparative result is pre-conditioned for not satisfying; Judge that said original data lost efficacy,, judge that the original data that generates result of calculation is effective when comparative result satisfies when pre-conditioned;

Generate appraisal curve according to said result of calculation;

Said appraisal curve and the calibrated curve that generates according to preset standard of comparison are carried out matching ratio; When comparative result is pre-conditioned for not satisfying; Judge that said original data lost efficacy,, judge that the original data that generates appraisal curve is effective when comparative result satisfies when pre-conditioned.

9. brake system check method according to claim 7 is characterized in that, also comprises:

Compared result is showed.

10. brake system check method according to claim 7 is characterized in that, also comprises:

When judging that said original data lost efficacy, report to the police.

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