CN105480030A - Method for judging vehicle load abnormity - Google Patents

Abstract

The invention provides a method for judging vehicle load abnormity, which comprises the following steps: firstly, receiving a plurality of tire pressures generated by a tire pressure detection unit at a plurality of detection time points, and calculating the variation of the tire pressures so as to be converted to slope data; then, judging whether the slope data is a positive value; if the slope data is the positive value, calculating the finally acquired tire pressure and tire parameter by utilizing a tire deflection calculation formula so as to acquire tire deformation; calculating the finally acquired tire pressure and tire parameter by utilizing a load calculation formula so as to acquire tire load data; comparing the tire load data with the tire deformation by utilizing a tire abnormity condition; and if the tire load data and the tire deformation conform to the tire abnormity condition, determining that the vehicle load is abnormal. Thus, a more accurate detection result is provided.

Description

Judge the method for vehicle load exception

Technical field

The present invention relates to a kind of method of inspection be applied on vehicle, particularly relate to a kind of method judging vehicle load exception.

Background technology

Along with the common people come back for the consciousness of traffic safety, many depots start the checking device of configuration monitoring traffic safety on a vehicle, as noted down the vehicle display of vehicular motion, or the tire air pressure monitoring system of sense vehicle tire pressure (Tirepressuremonitoringsystem is called for short TPMS).Wherein, with vehicle load abnormality detection, so-called vehicle load is when this vehicle carries a load extremely, when the tire on this vehicle bears the load of this vehicle and produces distortion, the inner tube of a tyre space of this tire is diminished, and this pressure of tire raises with the load supporting this vehicle.

And vehicle load abnormality detection now mainly utilizes general Haier (Hell) formula to carry out evaluates calculation, to obtain tire load-carrying data of this tire.But because tire construction is generally complicated, although general Haier formula gives this tire load-carrying data, but general Haier formula is in the process of these tire load-carrying data of estimation, do not consider the deflection of this tire reality, and easily produce the situation that these tire load-carrying data and reality be not inconsistent and occur.

Summary of the invention

Main purpose of the present invention, is that solving existing detection mode reckons without tire actual change and easily have the problem that error occurs.

For reaching above-mentioned purpose, the invention provides a kind of method judging vehicle load exception, be applied on a vehicle, this vehicle has multiple tire, each this tire comprises at least one tire parameter representing this tire characteristics, each this tire is equipped with a tire pressure detecting unit, each this tire pressure detecting unit normality detect assemble wherein this tire tire in state and export a pressure of tire every a detection time, the method comprises step to be had:

Step one, accepts those pressure of tire that wherein this tire pressure detecting unit produced multiple detection time, and calculates the variable quantity of each this pressure of tire within each this detection time, convert a slope data to;

Step 2, judge this slope data be whether on the occasion of, if on the occasion of entering next step, if negative value then re-executes step one;

Step 3, utilize a tyre deflection computing formula to calculate a squeegee action amount to this pressure of tire finally obtained and this tire parameter, and utilize a load-carrying computing formula to calculate tire load-carrying data to this pressure of tire finally obtained and this tire parameter; And

Step 4, utilizes an abnormal tyre condition to compare these tire load-carrying data and this squeegee action amount, if these tire load-carrying data and this squeegee action amount meet this abnormal tyre condition namely determine that this vehicle load is abnormal.

In an embodiment, this tyre deflection computing formula is:

$P=\frac{P_0{V}_0}{V_0-[\frac{2{\sin }^{-1}\left(\frac{\sqrt{2\mathrm{Rf}-f^2}}{R}\right){\mathrm{\πR}}^2}{360}-\frac{\left(2\sqrt{2\mathrm{Rf}-f^2}\right)(R-f)}{2}]b}$

Wherein, R, V0, P0 and b are respectively wherein this tire parameter of this tire, and R is a tire radius, and V0 is the unloaded initial volume of a tire, and P0 is the unloaded crude tyre tire pressure of a tire, and b is a deflected width of tyre, and f is then this squeegee action amount.

In an embodiment, this load-carrying computing formula is:

$W=2\mathrm{Pb}\sqrt{2\mathrm{Rf}-f^2}$

Wherein, P, b and R are respectively wherein this tire parameter of this tire, and P is a pressure of tire, and b is a deflected width of tyre, and R is a tire radius, and f is this squeegee action amount, and W is these tire load-carrying data.

In an embodiment, this abnormal tyre condition is one in order to compare the tire sinking critical value of this squeegee action amount, and one in order to compare the loading of tire critical value of these tire load-carrying data.

In an embodiment; this step 2 more includes the sub-step that a startup judges vehicle load exception: utilize the abnormal benchmark of a slope and this slope data to compare; if the numerical value of this slope data enters step 3 when being more than or equal to this slope exception benchmark, if the numerical value of this slope data is less than the abnormal benchmark of this slope, re-execute step 2.

In an embodiment, this step 2 more includes the sub-step of a judgement inclination of vehicle: obtain wherein this slope data of this tire and this slope data of another this tire, and compare those slope datas of two these tires, if those slope datas are identically be judged as that vehicle is normal, if those slope datas are differently be judged as inclination of vehicle.

In an embodiment, before this step one performs, include the sub-step that obtains tire virgin state: keep this vehicle to be a no-load condition, utilize a tire volume computing formula to obtain the unloaded initial volume of a tire of each this tire.Further, this tire volume computing formula is:

V ₀＝πR ²b

Wherein, R is a tire radius, and b is a deflected width of tyre, and this V0 is a tire zero load initial volume.

In an embodiment, before this step one performs, include the sub-step that provides tire parameter.

By said method of the present invention, compared to existing, there is following characteristics:

1. with this squeegee action amount and this tire load-carrying data, the present invention judges that vehicle load is abnormal, more can meet this tire condition of this vehicle of reality, and can provide judged result accurately, avoids judging the accident caused by accident and occurs.

Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.

Accompanying drawing explanation

Fig. 1, schematic diagram implemented by the vehicle of one embodiment of the invention;

Fig. 2, the tire parameter schematic diagram of one embodiment of the invention;

Fig. 3, the implementing procedure schematic diagram of one embodiment of the invention;

Fig. 4, the implementing procedure schematic diagram of another embodiment of the present invention;

Fig. 5-1, the pressure of tire schematic diagram of one embodiment of the invention;

Fig. 5-2, the pressure of tire schematic diagram that the vehicle of one embodiment of the invention does not tilt;

Fig. 5-3, the pressure of tire signal of the inclination of vehicle of one embodiment of the invention.

Detailed description of the invention

Below in conjunction with accompanying drawing, structural principle of the present invention and principle of work are described in detail:

Refer to Fig. 1 and Fig. 2, the method of vehicle load exception of the present invention, be applied to a vehicle 1, this vehicle 1 has multiple tire 11, each this tire 11 comprises at least one tire parameter representing this tire 11 feature, and the Fig. 2 that please arrange in pairs or groups, this tire parameter of the present invention can be this tire 11 make rear use before specification data, as a tire radius R, a tire ground connection patch length a, a deflected width of tyre b, the unloaded initial volume V0 of a tire etc.Moreover, each this tire 11 of the present invention is more equipped with a tire pressure detecting unit 111, state in the tire that each this tire pressure detecting unit 111 normality detects wherein this tire 11 assembled, and each this tire pressure detecting unit 111 is every a T detection time (this figure does not show), and output has a pressure of tire P, each this tire pressure detecting unit 111, in an embodiment, can be sensing kenel or tire external sensed kenel in tire.Again, the present invention is in an embodiment, and this vehicle 1 can be provided with an electronics package 12 be connected with each this tire pressure detecting unit 111 information, and the inventive method then loads in this electronics package 12 by the mode of programming logic language.

And please arrange in pairs or groups and consult Fig. 3, from the above, the method for vehicle load exception of the present invention includes following steps:

Step one S1, accepts wherein this tire pressure detecting unit 111 those pressure of tire P that T produces multiple detection time, and calculates the variable quantity of each this pressure of tire P in each this detection time T, converts a slope data M1 to;

Step 2 S2, judge this slope data M1 be whether on the occasion of, if on the occasion of entering next step, if negative value then re-executes step 2;

Step 3 S3, utilize a tyre deflection computing formula to calculate a squeegee action amount f to this pressure of tire P finally obtained and this tire parameter, and utilize a load-carrying computing formula to calculate tire load-carrying data to this pressure of tire P finally obtained and this tire parameter;

Step 4 S4, utilizes an abnormal tyre condition to compare these tire load-carrying data and this squeegee action amount f, if these tire load-carrying data and this squeegee action amount f meet this abnormal tyre condition namely determine that this vehicle 1 load-carrying is abnormal.

Illustrate, in initially of the invention process, first this electronics package 12 information is utilized to be linked and packed wherein this tire pressure detecting unit 111 on this vehicle 1, and obtain this tire pressure detecting unit 111 continuously in continuous print multiple pressure of tire P that multiple detection time, T produced, calculate the variable quantity of acquired those pressure of tire P in above-mentioned those detection times T subsequently, convert a slope data M1 (as Fig. 5-1) to, and enter step 2 S2.In step 2 S2, can utilize this electronics package 12 judge this slope data M1 be whether on the occasion of, if on the occasion of namely representing that this vehicle 1 is in state that load continuous increases the weight of and enters step 3 S3, if negative value then represents the state that this vehicle 1 is in load continuous and alleviates.In step 3 S3, this tyre deflection computing formula is first utilized to calculate a squeegee action amount f to this pressure of tire P finally obtained and this tire parameter.This tyre deflection computing formula alleged is mainly used in the bulk deformation amount after calculating this tire 11 load, and this tyre deflection computing formula is as follows:

$P=\frac{P_0{V}_0}{V_0-[\frac{2{\sin }^{-1}\left(\frac{\sqrt{2\mathrm{Rf}-f^2}}{R}\right){\mathrm{\πR}}^2}{360}-\frac{\left(2\sqrt{2\mathrm{Rf}-f^2}\right)(R-f)}{2}]b}$

Wherein, R, V0, P0 and b are respectively wherein this tire parameter of this tire 11, and R is this tire radius, and V0 is the unloaded initial volume of this tire, and P0 is the unloaded crude tyre tire pressure of a tire, and b is this deflected width of tyre, and f is then this squeegee action amount.After obtaining this squeegee action amount f, carries out calculating with this load-carrying computing formula immediately and obtain this tire load-carrying data, and this load-carrying computing formula is as follows:

$W=2\mathrm{Pb}\sqrt{2\mathrm{Rf}-f^2}$

Wherein, P, b and R are respectively wherein this tire parameter of this tire 11, and P is this pressure of tire finally obtained, and b is a deflected width of tyre, and R is a tire radius, and f is this squeegee action amount, and W is these tire load-carrying data.Hold, after the present invention utilizes this tyre deflection computing formula and this load-carrying computing formula to obtain this squeegee action amount f and this tire load-carrying data respectively, enter step 4 S4 immediately and compare this squeegee action amount f and this tire load-carrying data with this abnormal tyre condition, if these tire load-carrying data and this squeegee action amount f meet this abnormal tyre condition namely determine that this vehicle 1 load-carrying is abnormal.Further illustrate, this abnormal tyre condition can be tiremaker in designing tyre process, allow this change of tire 11 in use procedure, such as, tire pressure change etc. after the cubic deformation amount of this tire 11 or this tyre load.Illustrate, in an embodiment, this abnormal tyre condition comprises one in order to compare the tire sinking critical value of this squeegee action amount f, and one in order to compare the loading of tire critical value of these tire load-carrying data.

Hold; and Fig. 4 and Fig. 5-1 that please arrange in pairs or groups; in an embodiment; this step 2 S2 more includes the sub-step S21 that a startup judges vehicle load exception: utilize the abnormal benchmark R1 and this slope data M1 of a slope to compare; if when the numerical value of this slope data M1 is more than or equal to this slope exception benchmark R1; namely enter this step 3 S3, if the numerical value of this slope data M1 is less than the abnormal benchmark of this slope, re-execute this step 2 S2.More specifically illustrate, in implementation process, when this vehicle 1 steadily loads and bears a heavy burden, this slope data M1 that each this tire 11 is produced after testing all steadily rises.And when load uprushed by this vehicle 1, each this tire 11 detects this slope data M1 produced and produces acute variation and be more than or equal to the abnormal benchmark R1 of this slope, now the present invention can judge the possibility of vehicle load exception the initial stage, enters this step 3 S3.

Moreover, and the Fig. 5-3 that please arrange in pairs or groups, the present invention is in an embodiment, this step 2 S2 more can include the sub-step S22 of a judgement inclination of vehicle: obtain this slope data M1 of wherein this tire 11 and another slope data M2 of another tire 13, and compare those slope datas M1, M2 of two these tires 11,13, if those slope datas M1, M2 are identically judged as that vehicle is normal, if those slope datas M1, M2 are different, is judged as inclination of vehicle.More specifically illustrate, when increase is carried on the wherein side of this vehicle 1 to this vehicle 1 suddenly, to should namely bear the load pressure that comparatively this tire 11 is larger by this tire 13 set by side, and the tire internal pressure of this tire 13 can be made obviously to raise, this slope data M1 making this slope data M2 can be greater than this tire 11 to calculate, make two this slope data M1, M2 inconsistent, and then can assert that this vehicle 1 has the inclination facts to occur.

Again, refer to Fig. 4 again, the present invention is in an embodiment, before this step one S1 performs, more can include the sub-step S11 that obtains tire virgin state: keep this vehicle 1 to be a no-load condition, utilize a tire volume computing formula to obtain the unloaded initial volume V0 of this tire of each this tire 11.The present embodiment sub-step is mainly used for this tire 11 that this vehicle 1 more renews, and after again inflating for each this tire 11 and tire inner volume under being in no-load condition measure, make the present invention in the future make to judge more can meet the concrete enforcement state of this tire 11.Moreover this tire volume computing formula is:

V ₀＝πR ²b

Wherein, R is this tire radius, and b is this deflected width of tyre, and this V0 is this tire zero load initial volume.From the above, the tyre kind sold due to market is now many, and for can more accurate measurement, the present invention, in an embodiment, more can include the sub-step S10 that provides tire parameter before this step one S1 performs.

In sum, the present invention judges the method for vehicle load exception, first multiple pressure of tire that a tire pressure detecting unit produced multiple detection time are accepted, and the variable quantity calculating those pressure of tire is converted to a slope data, after this judge this slope data be whether on the occasion of, if calculate a squeegee action amount on the occasion of namely utilizing a tyre deflection computing formula to this pressure of tire finally obtained and this tire parameter, and utilize a load-carrying computing formula to calculate tire load-carrying data to this pressure of tire finally obtained and this tire parameter, the abnormal tyre condition that recycles compares these tire load-carrying data and this squeegee action amount, if these tire load-carrying data and this squeegee action amount meet this abnormal tyre condition namely determine that this vehicle load is abnormal.By this, with solve existing judgment mode do not consider actual tire state and easily have judge misalignment the facts occur.

Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection domain that all should belong to the claim appended by the present invention.

Claims (9)

1. one kind judges the method for vehicle load exception, be applied on a vehicle, this vehicle has multiple tire, each this tire comprises at least one tire parameter representing this tire characteristics, each this tire is equipped with a tire pressure detecting unit, each this tire pressure detecting unit normality detect assemble wherein this tire tire in state and export a pressure of tire every a detection time, it is characterized in that, the method comprises step to be had:

Step one, accepts those pressure of tire that wherein this tire pressure detecting unit produced multiple detection time, and calculates the variable quantity of each this pressure of tire within each this detection time, convert a slope data to;

Step 2, judge this slope data be whether on the occasion of, if on the occasion of entering next step, if negative value then re-executes step one;

Step 3, utilize a tyre deflection computing formula to calculate a squeegee action amount to this pressure of tire finally obtained and this tire parameter, and utilize a load-carrying computing formula to calculate tire load-carrying data to this pressure of tire finally obtained and this tire parameter; And

Step 4, utilizes an abnormal tyre condition to compare these tire load-carrying data and this squeegee action amount, if these tire load-carrying data and this squeegee action amount meet this abnormal tyre condition namely determine that this vehicle load is abnormal.

2. judge the method for vehicle load exception as claimed in claim 1, it is characterized in that, this tyre deflection computing formula is:

$P=\frac{P_0{V}_0}{V_0-[\frac{2{\sin }^{-1}\left(\frac{\sqrt{2\mathrm{Rf}-f^2}}{R}\right){\mathrm{\πR}}^2}{360}-\frac{\left(2\sqrt{2\mathrm{Rf}-f^2}\right)(R-f)}{2}]b}$

Wherein, R, V0, P0 and b are respectively wherein this tire parameter of this tire, and R is a tire radius, and V0 is the unloaded initial volume of a tire, and P0 is the unloaded crude tyre tire pressure of a tire, and b is a deflected width of tyre, and f is then this squeegee action amount.

3. judge the method for vehicle load exception as claimed in claim 1 or 2, it is characterized in that, this load-carrying computing formula is:

$W=2\mathrm{Pb}\sqrt{2\mathrm{Rf}-f^2}$

Wherein, P, b and R are respectively wherein this tire parameter of this tire, and P is a pressure of tire, and b is a deflected width of tyre, and R is a tire radius, and f is this squeegee action amount, and W is these tire load-carrying data.

4. judge the method for vehicle load exception as claimed in claim 1, it is characterized in that, this abnormal tyre condition is one in order to compare the tire sinking critical value of this squeegee action amount, and one in order to compare the loading of tire critical value of these tire load-carrying data.

5. judge the method for vehicle load exception as claimed in claim 1; it is characterized in that; this step 2 more includes the sub-step that a startup judges vehicle load exception: utilize the abnormal benchmark of a slope and this slope data to compare; if the numerical value of this slope data enters step 3 when being more than or equal to this slope exception benchmark, if the numerical value of this slope data is less than the abnormal benchmark of this slope, re-execute step 2.

6. judge the method for vehicle load exception as claimed in claim 1, it is characterized in that, this step 2 more includes the sub-step of a judgement inclination of vehicle: obtain wherein this slope data of this tire and this slope data of another this tire, and compare those slope datas of two these tires, if those slope datas are identically be judged as that vehicle is normal, if those slope datas are differently be judged as inclination of vehicle.

7. judge the method for vehicle load exception as claimed in claim 1, it is characterized in that, before this step one performs, include the sub-step that obtains tire virgin state: keep this vehicle to be a no-load condition, utilize a tire volume computing formula to obtain the unloaded initial volume of a tire of each this tire.

8. judge the method for vehicle load exception as claimed in claim 7, it is characterized in that, this tire volume computing formula is:

V ₀＝πR ²b

Wherein, R is a tire radius, and b is a deflected width of tyre, and this V0 is a tire zero load initial volume.

9. judge the method for vehicle load exception as claimed in claim 1, it is characterized in that, before this step one performs, include the sub-step that provides tire parameter.