CN105444852A - TPMS-based vehicle load detection method, device, vehicle real-time load monitoring method and system - Google Patents

Abstract

The invention discloses a TPMS-based vehicle load detection method. The method includes the following steps that: a TPMS acquires gas pressure intensity values of P1, P2,..., Pn and gas temperature values of T1, T2,..., Tn in each tire under the load condition of a vehicle, wherein n is the total number of the tires of the vehicle; a load processing module calculates the load on each tire of the vehicle through adopting a formula mentioned in the descriptions of the invention; and after obtaining the load M1, load M2,..., load Mn on each tire of the vehicle, the load processing module calculates the total load Mz of the vehicle through adopting a formula that Mz=alpha1M1+alpha2M2+...alphanMn, wherein alpha1, alpha2,..., alphan are the weight coefficients of each tire, and alpha1+alpha2+... alphan=1. With the TPMS-based vehicle load detection method of the invention adopted, the total load of the vehicle can be detected more accurately. The invention also discloses a TPMS-based vehicle load detection device, a vehicle real-time load monitoring method and a vehicle real-time load monitoring system.

Description

Based on vehicle load detection method and device, vehicle real-time load method for supervising and the system of TPMS

Technical field

The present invention relates to communications and transportation and intelligent monitoring technical field, particularly relate to a kind of vehicle load detection method based on system for monitoring pressure in tyre (TirePressureMonitoringSystem is called for short TPMS) and device, vehicle real-time load method for supervising and system.

Background technology

When the present load-carrying for vehicle detects, during the method for usual employing, tire is assumed to be hollow cylinder, and the surface of contact on tire outside diameter and ground is considered as rectangular contact face, obtain inside tires pressure to the pressure of rectangular contact face portion and the anchorage force equal (i.e. Mg=PS) of ground in the face of tire according to acting force and reacting force principle, calculated the load on tire by the gas pressure intensity only detecting inside tires.But due to the pressure inside the footprint pressure on tire and ground and tire be not same object, the load-carrying of the vehicle therefore drawn by detection method is accurate not.In addition, the method of existing monitoring vehicle load-carrying, wireless sensor gateway and wireless sensor network is normally utilized to transfer data to Surveillance center, wireless sensor gateway is arranged on the garbage transfer station of urban district fixed point, so just specifically can send data to Surveillance center just now, the object of monitoring in real time can not reached.

Summary of the invention

Fundamental purpose of the present invention is to provide a kind of vehicle load detection method based on TPMS and device, vehicle real-time load method for supervising and system, be intended to the airlift more accurately detecting vehicle, and realize the real-time monitoring of vehicle and easily vehicle dispatched.

To achieve these goals, the invention provides a kind of vehicle load detection method based on TPMS, comprise the steps:

The gas pressure intensity value P of step S10:TPMS collection vehicle under load condition in each tire ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and wirelessly by described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _nbe transferred to load-carrying processing module, wherein n is the tire total number of vehicle;

Step S20: load-carrying processing module receives described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and adopt following formula (1) to calculate load on each tire of vehicle,

$M_i=\frac{K_i}{g}\sqrt[3]{\frac{{\mathrm{\π}}^2{(P_{0i}{T}_i-P_i{T}_{0i})}^2{({R_i}^2-{r_i}^2)}^2{W}_i}{2P_{0i}{T}_{0i}{R}_i}}---\left(1\right)$

Wherein, M _ibe the load on i-th tire, i is positive integer and 1≤i≤n, K _ifor the radial Static stiffness that i-th tire is corresponding under the load-carrying corresponding to its load-carrying index, g is acceleration of gravity, and π is circular constant, P _0igas pressure intensity value when being i-th tire zero load in tire, T _0igas temperature when being i-th tire zero load in tire, T _ibe the gas pressure intensity value of i-th tire under load condition, P _ibe the gas temperature angle value of i-th tire under load condition, R _ibe the external diameter of i-th tire, r _ibe the internal diameter of i-th tire, W _iit is the width of i-th tire;

Step S30: described load-carrying processing module is calculating the load M on each tire of vehicle ₁, M ₂..., M _nafter, adopt following formula (2) to calculate the airlift of vehicle _mz,

M _z＝α ₁M ₁+α ₂M ₂+…α _nM _n(2)

Wherein, α ₁, α ₂..., α _nbe respectively the weight coefficient of each tire, and α ₁+ α ₂+ ... α _n=1.

Especially, in described step S20, for the load M on each tire _i, draw especially by following process:

Tire is considered as hollow cylinder, and the external diameter of tire is R _i, the internal diameter of tire is r _i, tire the W of width _i, and the gas in tire is considered as ideal gas;

Under load condition, the shape generation deformation of tire, if the contact area on tire and ground be one long for L _i, wide be W _irectangle, the deflection that tire is vertically gone up is x _i, the angle that tire heart and described rectangle length direction two edge lines are formed is β _i, tire heart is h to the height on road surface _i, then have:

h _i＝R _i-x _i(3)

$L_i=2\sqrt{{R_i}^2-{h_i}^2}---\left(4\right)$

In tire, the volume change of gas is Δ V _i, then

ΔV _i＝ΔS _iW _i(5)

Wherein Δ S _ican be calculated by following formula (6),

${\mathrm{\ΔS}}_i=\frac{1}{2}{R_i}^2{\mathrm{\β}}_i-\frac{1}{2}{L}_i{h}_i---\left(6\right)$

By the length L of described rectangle _ibe considered as and angle beta _icorresponding arc length is equal, then have:

L _i＝R _iβ _i(7)

Can be obtained by above formula (3), (4), (5), (6), (7)

${x_i}^4-2R_i{x_i}^3+{\left(\frac{{\mathrm{\ΔV}}_i}{W_i}\right)}^2=0---\left(8\right)$

In above-mentioned formula (8), omit x _ibiquadratic item, can obtain

$x_i=\sqrt[3]{\frac{{\left({\mathrm{\ΔV}}_i\right)}^2}{2R_i{W_i}^2}}---\left(9\right)$

Again according to the Ideal-Gas Equation, can obtain

$\frac{P_{0i}{V}_{0i}}{T_{0i}}=\frac{P_i{V}_i}{T_i}---\left(10\right)$

In tire, the volume change of gas is Δ V _ican be expressed as

ΔV _i＝-(V _i-V _0i)(11)

Tire after gassy is considered as the very large spring of a rigidity, the radial Static stiffness of tire under different load-carrying is considered as certain value, and with the radial Static stiffness K of tire under the load-carrying corresponding to its load-carrying index _irepresent, then according to Hooke's law, can obtain

K _ix _i＝M _ig(12)

Described formula (1) can be obtained by above formula (9), (10), (11), (12)

$M_i=\frac{K_i}{g}\sqrt[3]{\frac{{\mathrm{\π}}^2{(P_{0i}{T}_i-P_i{T}_{0i})}^2{({R_i}^2-{r_i}^2)}^2{W}_i}{2P_{0i}{T}_{0i}{R}_i}}---\left(1\right)$

The present invention also provides a kind of vehicle load pick-up unit based on TPMS, comprises TPMS and load-carrying processing module, wherein:

Described TPMS is used for the gas pressure intensity value P of collection vehicle under load condition in each tire ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and wirelessly by described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _nbe transferred to load-carrying processing module, wherein n is the tire total number of vehicle;

Described load-carrying processing module is for receiving described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and adopt following formula (1) to calculate load on each tire of vehicle,

$M_i=\frac{K_i}{g}\sqrt[3]{\frac{{\mathrm{\π}}^2{(P_{0i}{T}_i-P_i{T}_{0i})}^2{({R_i}^2-{r_i}^2)}^2{W}_i}{2P_{0i}{T}_{0i}{R}_i}}---\left(1\right)$

Wherein, M _ibe the load on i-th tire, i is positive integer and 1≤i≤n, K _ifor the radial Static stiffness that i-th tire is corresponding under the load-carrying corresponding to its load-carrying index, g is acceleration of gravity, and π is circular constant, P _0igas pressure intensity value when being i-th tire zero load in tire, T _0igas temperature when being i-th tire zero load in tire, T _ibe the gas pressure intensity value of i-th tire under load condition, P _ibe the gas temperature angle value of i-th tire under load condition, R _ibe the external diameter of i-th tire, r _ibe the internal diameter of i-th tire, W _iit is the width of i-th tire;

Described load-carrying processing module is also for calculating the load M on each tire of vehicle ₁, M ₂..., M _nafter, adopt following formula (2) to calculate the airlift M of vehicle _z,

M _z＝α ₁M ₁+α ₂M ₂+…α _nM _n(2)

Wherein, α ₁, α ₂..., α _nbe respectively the weight coefficient of each tire, and α ₁+ α ₂+ ... α _n=1.

Especially, described load-carrying processing module is especially by the load M on each tire of following process computation _i:

Tire is considered as hollow cylinder, and the external diameter of tire is R _i, the internal diameter of tire is r _i, tire the W of width _i, and the gas in tire is considered as ideal gas;

Under load condition, the shape generation deformation of tire, if the contact area on tire and ground be one long for L _i, wide be W _irectangle, the deflection that tire is vertically gone up is x _i, the angle that tire heart and described rectangle length direction two edge lines are formed is β _i, tire heart is h to the height on road surface _i, then have:

h _i＝R _i-x _i(3)

$L_i=2\sqrt{{R_i}^2-{h_i}^2}---\left(4\right)$

In tire, the volume change of gas is Δ V _i, then

ΔV _i＝ΔS _iW _i(5)

Wherein Δ S _ican be calculated by following formula (6),

${\mathrm{\ΔS}}_i=\frac{1}{2}{R_i}^2{\mathrm{\β}}_i-\frac{1}{2}{L}_i{h}_i---\left(6\right)$

By the length L of described rectangle _ibe considered as and angle beta _icorresponding arc length is equal, then have:

L _i＝R _iβ _i(7)

Can be obtained by above formula (3), (4), (5), (6), (7)

${x_i}^4-2R_i{x_i}^3+{\left(\frac{{\mathrm{\ΔV}}_i}{W_i}\right)}^2=0---\left(8\right)$

In above-mentioned formula (8), omit x _ibiquadratic item, can obtain

$x_i=\sqrt[3]{\frac{{\left({\mathrm{\ΔV}}_i\right)}^2}{2R_i{W_i}^2}}---\left(9\right)$

Again according to the Ideal-Gas Equation, can obtain

$\frac{P_{0i}{V}_{0i}}{T_{0i}}=\frac{P_i{V}_i}{T_i}---\left(10\right)$

In tire, the volume change of gas is Δ V _ican be expressed as

ΔV _i＝-(V _i-V _0i)(11)

Tire after gassy is considered as the very large spring of a rigidity, the radial Static stiffness of tire under different load-carrying is considered as certain value, and with the radial Static stiffness K of tire under the load-carrying corresponding to its load-carrying index _irepresent, then according to Hooke's law, can obtain

K _ix _i＝M _ig(12)

Described formula (1) can be obtained by above formula (9), (10), (11), (12)

$M_i=\frac{K_i}{g}\sqrt[3]{\frac{{\mathrm{\π}}^2{(P_{0i}{T}_i-P_i{T}_{0i})}^2{({R_i}^2-{r_i}^2)}^2{W}_i}{2P_{0i}{T}_{0i}{R}_i}}---\left(1\right)$

Especially, described load-carrying processing module is positioned in the electronic control unit (ElectronicControlUnit, be called for short ECU, Chinese is also called car running computer) of described vehicle or is arranged in remote monitoring center.

The present invention also provides a kind of vehicle real-time load method for supervising, comprises the steps:

Aforesaid vehicle load detection method is adopted to detect the current airlift of vehicle,

Remote monitoring center obtains the current airlift of vehicle, carry out analysis integrated after draw corresponding operating order, and described operational order is sent to the ECU of described vehicle by Wireless Data Transmission mode.

Especially, described load-carrying processing module is arranged in described remote monitoring center, the gas pressure intensity value P that described TPMS gathers ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _nfirst be transferred to the ECU of vehicle by wireless short-range communication mode, then sent to the load-carrying processing module of described remote monitoring center by Wireless Data Transmission mode by the ECU of vehicle.

Especially, the ECU of described vehicle is also by gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _nthe display screen of vehicle is sent to show.

The present invention also provides a kind of vehicle real-time load supervisory system, and comprise vehicle and remote monitoring center, described vehicle comprises TPMS and ECU, wherein:

Described TPMS is used for the gas pressure intensity value P of collection vehicle under load condition in each tire ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and by wireless short-range communication mode by described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _nbe transferred to described ECU, wherein n is the tire total number of vehicle;

Described ECU is used for the described gas pressure intensity value P that will receive ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _ndescribed remote monitoring center is sent to by Wireless Data Transmission mode;

Described remote monitoring center comprises receiver module, load-carrying processing module, analysis module and sending module, wherein:

The described gas pressure intensity value P that described receiver module sends for receiving described ECU ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n;

Described load-carrying processing module is used for according to described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, adopt following formula (1) to calculate load on each tire of vehicle,

$M_i=\frac{K_i}{g}\sqrt[3]{\frac{{\mathrm{\π}}^2{(P_{0i}{T}_i-P_i{T}_{0i})}^2{({R_i}^2-{r_i}^2)}^2{W}_i}{2P_{0i}{T}_{0i}{R}_i}}---\left(1\right)$

Wherein, M _ibe the load on i-th tire, i is positive integer and 1≤i≤n, K _ifor the radial Static stiffness that i-th tire is corresponding under the load-carrying corresponding to its load-carrying index, g is acceleration of gravity, and π is circular constant, P _0igas pressure intensity value when being i-th tire zero load in tire, T _0igas temperature when being i-th tire zero load in tire, T _ibe the gas pressure intensity value of i-th tire under load condition, P _ibe the gas temperature angle value of i-th tire under load condition, R _ibe the external diameter of i-th tire, r _ibe the internal diameter of i-th tire, W _iit is the width of i-th tire;

Described load-carrying processing module is also for calculating the load M on each tire of vehicle ₁, M ₂..., M _nafter, adopt following formula (2) to calculate the airlift M of vehicle _z,

M _z＝α ₁M ₁+α ₂M ₂+…α _nM _n(2)

Wherein, α ₁, α ₂..., α _nbe respectively the weight coefficient of each tire, and α ₁+ α ₂+ ... α _n=1;

Described analysis module be used for the current airlift of vehicle carry out analysis integrated after draw corresponding operating order;

Described sending module is used for the ECU described operational order being sent to described vehicle by Wireless Data Transmission mode.

Especially, described vehicle also comprises display screen, and described display screen is for showing the gas pressure intensity value P of described each tire of vehicle ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and for showing described operational order.

Vehicle load detection method based on TPMS of the present invention and device, vehicle real-time load method for supervising and system, there is following beneficial effect: by the tire after gassy is considered as the very large spring of a rigidity, and introduce tire this concept of radial Static stiffness under load-carrying, utilize the deflection of tire and Hooke's law to calculate the load on single tire, make the detection of the load on single tire more accurate, and determine its weight coefficient in airlift for each tire, take into full account the impact of the installation site of each tire in airlift, relative to existing vehicle load detection method, the vehicle load detection method that the present invention is based on TPMS is more accurate for the testing result of the airlift of vehicle, by can realizing the real-time monitoring of vehicle and conveniently dispatching vehicle.

Accompanying drawing explanation

Fig. 1 is the process flow diagram of vehicle load detection method one embodiment that the present invention is based on TPMS.

Fig. 2 is that tire is Longitudinal cross section schematic under the load-carrying corresponding to its load-carrying index based in the vehicle load detection method of TPMS shown in Fig. 1.

Fig. 3 for tire shown in Fig. 2 is after load-carrying, the contact picture on tire and road surface.

Fig. 4 is the structured flowchart of an embodiment of the vehicle load pick-up unit that the present invention is based on TPMS.

Fig. 5 is the process flow diagram of vehicle real-time load method for supervising one embodiment of the present invention.

Fig. 6 is the structured flowchart of vehicle real-time load supervisory system one embodiment of the present invention.

Fig. 7 is the structured flowchart of vehicle in the real-time load of vehicle shown in Fig. 6 supervisory system.

Fig. 8 is the structured flowchart of the real-time load of vehicle shown in Fig. 6 supervisory system medium-long range Surveillance center.

The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.

Embodiment

Should be appreciated that embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.

The invention provides a kind of vehicle load detection method based on TPMS.As shown in Figure 1, in one embodiment of this invention, the vehicle load detection method based on TPMS comprises the steps:

The gas pressure intensity value P of step S10:TPMS collection vehicle under load condition in each tire ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and wirelessly by described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _nbe transferred to load-carrying processing module, wherein n is the tire total number of vehicle;

Step S20: load-carrying processing module receives described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and adopt following formula (1) to calculate load on each tire of vehicle,

$M_i=\frac{K_i}{g}\sqrt[3]{\frac{{\mathrm{\π}}^2{(P_{0i}{T}_i-P_i{T}_{0i})}^2{({R_i}^2-{r_i}^2)}^2{W}_i}{2P_{0i}{T}_{0i}{R}_i}}---\left(1\right)$

Wherein, M _ibe the load on i-th tire, i is positive integer and 1≤i≤n, K _ifor the radial Static stiffness that i-th tire is corresponding under the load-carrying corresponding to its load-carrying index, g is acceleration of gravity, and π is circular constant, P _0igas pressure intensity value when being i-th tire zero load in tire, T _0igas temperature when being i-th tire zero load in tire, T _ibe the gas pressure intensity value of i-th tire under load condition, P _ibe the gas temperature angle value of i-th tire under load condition, R _ibe the external diameter of i-th tire, r _ibe the internal diameter of i-th tire, W _iit is the width of i-th tire;

Step S30: described load-carrying processing module is calculating the load M on each tire of vehicle ₁, M ₂..., M _nafter, adopt following formula (2) to calculate the airlift M of vehicle _z,

M _z＝α ₁M ₁+α ₂M ₂+…α _nM _n(2)

Wherein, α ₁, α ₂..., α _nbe respectively the weight coefficient of each tire, and α ₁+ α ₂+ ... α _n=1.

System for monitoring pressure in tyre (TirePressureMonitoringSystem, be called for short TPMS), it is a kind of employing Radio Transmission Technology, the high-sensitivity miniature wireless sensing device be fixed in doughnut is utilized to gather automotive tire pressure under driving or static state, the data such as temperature, and data are sent in the main frame in pilothouse, with related datas such as the real-time display automobile tire pressure of digitized form and temperature, and (pre-runflat) reminds driver to carry out the automobile active safety system of early warning with the form such as buzzing or voice when tire occurs abnormal.Thus guarantee that the pressure and temperature of tire maintains in critical field, play the probability reducing tire of blowing out, ruin, reduce the damage of oil consumption and vehicle part.TPMS has had a large amount of production at present, by buying with the tire of built-in TPMS, simple to operate, without the need to sensor installation again.

In step slo, by TPMS in vehicle, can the gas pressure intensity value P of collection vehicle under load condition in each tire easily ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n.During collection, can be Real-time Collection, can accomplish the real-time monitoring to vehicle load like this, can also be timing acquiring, when predetermined time interval or foregone conclusion part occur, TPMS just adopts the gas pressure intensity value P of collection vehicle in live load situation in each tire ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n.

Above-mentioned based in the vehicle load detection method of TPMS, tire after gassy is considered as the very large spring of a rigidity, and introduce tire this concept of radial Static stiffness under load-carrying, utilize the deflection of tire and Hooke's law to calculate the load on single tire, make the detection of the load on single tire more accurate, and determine its weight coefficient in airlift for each tire, take into full account the impact of the installation site of each tire in airlift, relative to existing vehicle load detection method, the vehicle load detection method that the present invention is based on TPMS is more accurate for the testing result of the airlift of vehicle.

With reference to Fig. 2 and Fig. 3, in described step S20, for the load M on each tire _i, draw especially by following process:

Tire is considered as hollow cylinder, and the external diameter of tire is R _i, the internal diameter of tire is r _i, tire the W of width _i, and the gas in tire is considered as ideal gas;

Under load condition, the shape generation deformation of tire, if the contact area on tire and ground be one long for L _i, wide be W _irectangle, the deflection that tire is vertically gone up is x _i, the angle that tire heart and described rectangle length direction two edge lines are formed is β _i, tire heart is h to the height on road surface _i, then have:

h _i＝R _i-x _i(3)

$L_i=2\sqrt{{R_i}^2-{h_i}^2}---\left(4\right)$

In tire, the volume change of gas is Δ V _i, then

ΔV _i＝ΔS _iW _i(5)

Wherein Δ S _ican be calculated by following formula (6),

${\mathrm{\ΔS}}_i=\frac{1}{2}{R_i}^2{\mathrm{\β}}_i-\frac{1}{2}{L}_i{h}_i---\left(6\right)$

By the length L of described rectangle _ibe considered as and angle beta _icorresponding arc length is equal, then have:

L _i＝R _iβ _i(7)

Can be obtained by above formula (3), (4), (5), (6), (7)

${x_i}^4-2R_i{x_i}^3+{\left(\frac{{\mathrm{\ΔV}}_i}{W_i}\right)}^2=0---\left(8\right)$

In above-mentioned formula (8), omit x _ibiquadratic item, can obtain

$x_i=\sqrt[3]{\frac{{\left({\mathrm{\ΔV}}_i\right)}^2}{2R_i{W_i}^2}}---\left(9\right)$

Again according to the Ideal-Gas Equation, can obtain

$\frac{P_{0i}{V}_{0i}}{T_{0i}}=\frac{P_i{V}_i}{T_i}---\left(10\right)$

In tire, the volume change of gas is Δ V _ican be expressed as

ΔV _i＝-(V _i-V _0i)(11)

Tire after gassy is considered as the very large spring of a rigidity, the radial Static stiffness of tire under different load-carrying is considered as certain value, and with the radial Static stiffness K of tire under the load-carrying corresponding to its load-carrying index _irepresent, then according to Hooke's law, can obtain

K _ix _i＝M _ig(12)

Described formula (1) can be obtained by above formula (9), (10), (11), (12)

$M_i=\frac{K_i}{g}\sqrt[3]{\frac{{\mathrm{\π}}^2{(P_{0i}{T}_i-P_i{T}_{0i})}^2{({R_i}^2-{r_i}^2)}^2{W}_i}{2P_{0i}{T}_{0i}{R}_i}}---\left(1\right)$

When calculating the load on single tire, by the tire after gassy is considered as the very large spring of a rigidity, and introduce tire this concept of radial Static stiffness under load-carrying, utilize the deflection of tire and Hooke's law to calculate the load on single tire, make the detection of the load on single tire more accurate.

The present invention also provides a kind of vehicle load pick-up unit based on TPMS.As shown in Figure 4, in one embodiment of this invention, the vehicle load pick-up unit 100 based on TPMS comprises TPMS10 and load-carrying processing module 20, wherein:

Described TPMS10 is used for the gas pressure intensity value P of collection vehicle under load condition in each tire ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and wirelessly by described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _nbe transferred to load-carrying processing module 20, wherein n is the tire total number of vehicle;

Described load-carrying processing module 20 is for receiving described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and adopt following formula (1) to calculate load on each tire of vehicle,

$M_i=\frac{K_i}{g}\sqrt[3]{\frac{{\mathrm{\π}}^2{(P_{0i}{T}_i-P_i{T}_{0i})}^2{({R_i}^2-{r_i}^2)}^2{W}_i}{2P_{0i}{T}_{0i}{R}_i}}---\left(1\right)$

Wherein, M _ibe the load on i-th tire, i is positive integer and 1≤i≤n, K _ifor the radial Static stiffness that i-th tire is corresponding under the load-carrying corresponding to its load-carrying index, g is acceleration of gravity, and π is circular constant, P _0igas pressure intensity value when being i-th tire zero load in tire, T _0igas temperature when being i-th tire zero load in tire, T _ibe the gas pressure intensity value of i-th tire under load condition, P _ibe the gas temperature angle value of i-th tire under load condition, R _ibe the external diameter of i-th tire, r _ibe the internal diameter of i-th tire, W _iit is the width of i-th tire;

Described load-carrying processing module 20 is also for calculating the load M on each tire of vehicle ₁, M ₂..., M _nafter, adopt following formula (2) to calculate the airlift M of vehicle _z,

M _z＝α ₁M ₁+α ₂M ₂+…α _nM _n(2)

Wherein, α ₁, α ₂..., α _nbe respectively the weight coefficient of each tire, and α ₁+ α ₂+ ... α _n=1.

Above-mentioned based in the vehicle load pick-up unit 100 of TPMS10, can the gas pressure intensity value P of collection vehicle under load condition in each tire easily by TPMS10 in vehicle ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, load-carrying processing module 20 is when carrying out vehicle load and calculating, tire after gassy is considered as the very large spring of a rigidity, and introduce tire this concept of radial Static stiffness under load-carrying, utilize the deflection of tire and Hooke's law to calculate the load on single tire, make the detection of the load on single tire more accurate, and determine its weight coefficient in airlift for each tire, take into full account the impact of the installation site of each tire in airlift, therefore the present invention is based on the vehicle load pick-up unit 100 of TPMS10, the accurate detection of the airlift for vehicle can be realized.

Referring to Fig. 2 and Fig. 3, described load-carrying processing module 20 is especially by the load M on each tire of following process computation _i:

Tire is considered as hollow cylinder, and the external diameter of tire is R _i, the internal diameter of tire is r _i, tire the W of width _i, and the gas in tire is considered as ideal gas;

Under load condition, the shape generation deformation of tire, if the contact area on tire and ground be one long for L _i, wide be W _irectangle, the deflection that tire is vertically gone up is x _i, the angle that tire heart and described rectangle length direction two edge lines are formed is β _i, tire heart is h to the height on road surface _i, then have:

h _i＝R _i-x _i(3)

$L_i=2\sqrt{{R_i}^2-{h_i}^2}---\left(4\right)$

In tire, the volume change of gas is Δ V _i, then

ΔV _i＝ΔS _iW _i(5)

Wherein Δ S _ican be calculated by following formula (6),

${\mathrm{\ΔS}}_i=\frac{1}{2}{R_i}^2{\mathrm{\β}}_i-\frac{1}{2}{L}_i{h}_i---\left(6\right)$

By the length L of described rectangle _ibe considered as and angle beta _icorresponding arc length is equal, then have:

L _i＝R _iβ _i(7)

Can be obtained by above formula (3), (4), (5), (6), (7)

${x_i}^4-2R_i{x_i}^3+{\left(\frac{{\mathrm{\ΔV}}_i}{W_i}\right)}^2=0---\left(8\right)$

In above-mentioned formula (8), omit x _ibiquadratic item, can obtain

$x_i=\sqrt[3]{\frac{{\left({\mathrm{\ΔV}}_i\right)}^2}{2R_i{W_i}^2}}---\left(9\right)$

Again according to the Ideal-Gas Equation, can obtain

$\frac{P_{0i}{V}_{0i}}{T_{0i}}=\frac{P_i{V}_i}{T_i}---\left(10\right)$

In tire, the volume change of gas is Δ V _ican be expressed as

ΔV _i＝-(V _i-V _0i)(11)

Tire after gassy is considered as the very large spring of a rigidity, the radial Static stiffness of tire under different load-carrying is considered as certain value, and with the radial Static stiffness K of tire under the load-carrying corresponding to its load-carrying index _irepresent, then according to Hooke's law, can obtain

K _ix _i＝M _ig(12)

Described formula (1) can be obtained by above formula (9), (10), (11), (12)

$M_i=\frac{K_i}{g}\sqrt[3]{\frac{{\mathrm{\π}}^2{(P_{0i}{T}_i-P_i{T}_{0i})}^2{({R_i}^2-{r_i}^2)}^2{W}_i}{2P_{0i}{T}_{0i}{R}_i}}---\left(1\right)$

Described load-carrying processing module 20 is when calculating the load on single tire, by the tire after gassy is considered as the very large spring of a rigidity, and introduce tire this concept of radial Static stiffness under load-carrying, utilize the deflection of tire and Hooke's law to calculate the load on single tire, make the detection of the load on single tire more accurate.

In vehicle, ECU is actually " electronic control unit " (ElectronicControlUnit), and it is made up of three parts such as input circuit, microcomputer and output circuits.Input circuit accepts the signal of sensor and the input of other device, carries out filtration treatment and amplification, then convert the incoming level of certain volt to signal.The existing simulating signal of signal delivering to ECU input circuit from sensor also has digital signal, and simulating signal can be converted to digital signal by the A/D converter in input circuit, then passes to microcomputer.Above-mentioned pretreated signal is carried out calculation process by microcomputer, and process data are delivered to output circuit.Output circuit is by the power amplification of numerical information, and some also will be reduced to simulating signal, makes it drive controlled adjustment servoelement work.

In vehicle load pick-up unit 100, described load-carrying processing module 20 can be the ECU being positioned at described vehicle, like this need not by the gas pressure intensity value P in tire ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _ncarry out the transmission of remote-wireless data, utilize ECU can calculate the heavy duty weight of vehicle, but need ECU to have stronger data-handling capacity like this.Described load-carrying processing module 20 can also be arranged in remote monitoring center, and remote monitoring center is the server with stronger data-handling capacity, so just needs the gas pressure intensity value P in tire ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _ncarry out remote-wireless data and be transferred to remote monitoring center, the data-handling capacity that remote monitoring center is powerful again, calculate the airlift of vehicle rapidly, and remote monitoring center can obtain the airlift of multiple vehicle, can realize the real-time monitoring of vehicle and convenient vehicle to be dispatched.

The present invention also provides a kind of vehicle real-time load method for supervising.As shown in Figure 5, in one embodiment of this invention, vehicle real-time load method for supervising comprises the steps:

The gas pressure intensity value P of step S10:TPMS collection vehicle under load condition in each tire ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and wirelessly by described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _nbe transferred to load-carrying processing module, wherein n is the tire total number of vehicle;

Step S20: load-carrying processing module receives described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and adopt following formula (1) to calculate load on each tire of vehicle,

$M_i=\frac{K_i}{g}\sqrt[3]{\frac{{\mathrm{\π}}^2{(P_{0i}{T}_i-P_i{T}_{0i})}^2{({R_i}^2-{r_i}^2)}^2{W}_i}{2P_{0i}{T}_{0i}{R}_i}}---\left(1\right)$

Wherein, M _ibe the load on i-th tire, i is positive integer and 1≤i≤n, K _ifor the radial Static stiffness that i-th tire is corresponding under the load-carrying corresponding to its load-carrying index, g is acceleration of gravity, and π is circular constant, P _0igas pressure intensity value when being i-th tire zero load in tire, T _0igas temperature when being i-th tire zero load in tire, T _ibe the gas pressure intensity value of i-th tire under load condition, P _ibe the gas temperature angle value of i-th tire under load condition, R _ibe the external diameter of i-th tire, r _ibe the internal diameter of i-th tire, W _iit is the width of i-th tire;

Step S30: described load-carrying processing module is calculating the load M on each tire of vehicle ₁, M ₂..., M _nafter, adopt following formula (2) to calculate the airlift M of vehicle _z,

M _z＝α ₁M ₁+α ₂M ₂+…α _nM _n(2)

Wherein, α ₁, α ₂..., α _nbe respectively the weight coefficient of each tire, and α ₁+ α ₂+ ... α _n=1.

Step S40: remote monitoring center obtains the current airlift of vehicle, carry out analysis integrated after draw corresponding operating order, and described operational order is sent to the ECU of described vehicle by Wireless Data Transmission mode.

Above-mentioned vehicle real-time load method for supervising, by step S10 to S30, i.e. aforesaid vehicle load detection method, more accurately can detect the current airlift of vehicle, and by remote monitoring center, can realize the real-time monitoring of vehicle and convenient vehicle to be dispatched.

Described load-carrying processing module 20 is arranged in described remote monitoring center, the gas pressure intensity value P that described TPMS10 gathers ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _nfirst be transferred to the ECU of vehicle by wireless short-range communication mode, then sent to the load-carrying processing module 20 of described remote monitoring center by Wireless Data Transmission mode by the ECU of vehicle.Wherein, wireless short-range communication mode can adopt such as radio-frequency (RF) identification (RadioFrequencyIdentification, be called for short RFID) etc. communication mode, Wireless Data Transmission mode can be the communication mode such as general packet radio service technology (GeneralPacketRadioService is called for short GPRS), G mobile communication (3G), forth generation mobile communication technology (4G).Carry out data transmission by mobile base station, mobile base station quantity is many, and signal cover is wide, can reach the object of monitoring in real time.

The ECU of described vehicle is also by gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _nthe display screen of vehicle is sent to show.The driver of vehicle can be allowed like this to be well understood to the present situation of tire, to make a response in time when occurring abnormal, try to forestall traffic accidents generation effectively.

The present invention also provides a kind of vehicle real-time load supervisory system.As shown in Figure 6 to 8, in one embodiment of this invention, vehicle real-time load supervisory system 200 comprises vehicle 1 and remote monitoring center 2, and described vehicle 1 comprises TPMS10 and ECU11, wherein:

Described TPMS10 is used for the gas pressure intensity value P of collection vehicle 1 under load condition in each tire ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and by wireless short-range communication mode by described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _nbe transferred to described ECU11, wherein n is the tire total number of vehicle 1, and wherein, wireless short-range communication mode can adopt the communication modes such as such as radio-frequency (RF) identification (RadioFrequencyIdentification is called for short RFID);

Described ECU11 is used for the described gas pressure intensity value P that will receive ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _ndescribed remote monitoring center 2 is sent to by Wireless Data Transmission mode, wherein, Wireless Data Transmission mode can be the communication mode such as general packet radio service technology (GeneralPacketRadioService is called for short GPRS), G mobile communication (3G), forth generation mobile communication technology (4G).

Described remote monitoring center 2, for having the server of stronger data-handling capacity, comprises receiver module 21, load-carrying processing module 20, analysis module 23 and sending module 24, wherein:

The described gas pressure intensity value P that described receiver module 21 sends for receiving described ECU11 ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n;

Described load-carrying processing module 20 is for according to described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, adopt following formula (1) to calculate load on each tire of vehicle 1,

$M_i=\frac{K_i}{g}\sqrt[3]{\frac{{\mathrm{\π}}^2{(P_{0i}{T}_i-P_i{T}_{0i})}^2{({R_i}^2-{r_i}^2)}^2{W}_i}{2P_{0i}{T}_{0i}{R}_i}}---\left(1\right)$

Wherein, M _ibe the load on i-th tire, i is positive integer and 1≤i≤n, K _ifor the radial Static stiffness that i-th tire is corresponding under the load-carrying corresponding to its load-carrying index, g is acceleration of gravity, and π is circular constant, P _0igas pressure intensity value when being i-th tire zero load in tire, T _0igas temperature when being i-th tire zero load in tire, T _ibe the gas pressure intensity value of i-th tire under load condition, P _ibe the gas temperature angle value of i-th tire under load condition, R _ibe the external diameter of i-th tire, r _ibe the internal diameter of i-th tire, W _iit is the width of i-th tire;

Described load-carrying processing module 20 is also for calculating the load M on each tire of vehicle 1 ₁, M ₂..., M _nafter, adopt following formula (2) to calculate the airlift M of vehicle 1 _z,

M _z＝α ₁M ₁+α ₂M ₂+…α _nM _n(2)

Wherein, α ₁, α ₂..., α _nbe respectively the weight coefficient of each tire, and α ₁+ α ₂+ ... α _n=1;

Described analysis module 23 for the current airlift of vehicle 1 is carried out analysis integrated after draw corresponding operating order;

Described sending module 24 is for sending to the ECU11 of described vehicle 1 by Wireless Data Transmission mode by described operational order.

Above-mentioned vehicle real-time load supervisory system 200, can the gas pressure intensity value P of collection vehicle under load condition in each tire easily by TPMS10 in vehicle 1 ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, can calculate by the load-carrying processing module 20 of remote monitoring center 2 the current airlift detecting vehicle rapidly, and by remote monitoring center 2, can realize the real-time monitoring of vehicle and convenient vehicle to be dispatched.

Described vehicle 1 also comprises display screen 13, and described display screen 13 is for showing the gas pressure intensity value P of described each tire of vehicle 1 ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and for showing described operational order, the driver of vehicle 1 can be allowed like this to be well understood to the present situation of tire, to make a response in time when occurring abnormal, and timely operation command, try to forestall traffic accidents generation effectively.

The present invention is not limited to above embodiment, under technology contents disclosed in above-mentioned embodiment, can also carry out various change.Every equivalent structure transformation utilizing instructions of the present invention and accompanying drawing content to do, or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims (10)

1., based on a vehicle load detection method of TPMS, it is characterized in that, comprise the steps:

The gas pressure intensity value P of step S10:TPMS collection vehicle under load condition in each tire ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and wirelessly by described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _nbe transferred to load-carrying processing module, wherein n is the tire total number of vehicle;

Step S20: load-carrying processing module receives described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and adopt following formula (1) to calculate load on each tire of vehicle,

Wherein, M _ibe the load on i-th tire, i is positive integer and 1≤i≤n, K _ifor the radial Static stiffness that i-th tire is corresponding under the load-carrying corresponding to its load-carrying index, g is acceleration of gravity, and π is circular constant, P _0igas pressure intensity value when being i-th tire zero load in tire, T _0igas temperature when being i-th tire zero load in tire, T _ibe the gas pressure intensity value of i-th tire under load condition, P _ibe the gas temperature angle value of i-th tire under load condition, R _ibe the external diameter of i-th tire, r _ibe the internal diameter of i-th tire, W _iit is the width of i-th tire;

Step S30: described load-carrying processing module is calculating the load M on each tire of vehicle ₁, M ₂..., M _nafter, adopt following formula (2) to calculate the airlift M of vehicle _z,

M _z＝α ₁M ₁+α ₂M ₂+…α _nM _n(2)

Wherein, α ₁, α ₂..., α _nbe respectively the weight coefficient of each tire, and α ₁+ α ₂+ ... α _n=1.

2. vehicle load detection method as claimed in claim 1, is characterized in that, in described step S20, for the load M on each tire _i, draw especially by following process:

Tire is considered as hollow cylinder, and the external diameter of tire is R _i, the internal diameter of tire is r _i, tire the W of width _i, and the gas in tire is considered as ideal gas;

Under load condition, the shape generation deformation of tire, if the contact area on tire and ground be one long for L _i, wide be W _irectangle, the deflection that tire is vertically gone up is x _i, the angle that tire heart and described rectangle length direction two edge lines are formed is β _i, tire heart is h to the height on road surface _i, then have:

h _i＝R _i-x _i(3)

In tire, the volume change of gas is Δ V _i, then

ΔV _i＝ΔS _iW _i(5)

Wherein Δ S _ican be calculated by following formula (6),

By the length L of described rectangle _ibe considered as and angle beta _icorresponding arc length is equal, then have:

L _i＝R _iβ _i(7)

Can be obtained by above formula (3), (4), (5), (6), (7)

In above-mentioned formula (8), omit x _ibiquadratic item, can obtain

Again according to the Ideal-Gas Equation, can obtain

In tire, the volume change of gas is Δ V _ican be expressed as

ΔV _i＝-(V _i-V _0i)(11)

Tire after gassy is considered as the very large spring of a rigidity, the radial Static stiffness of tire under different load-carrying is considered as certain value, and with the radial Static stiffness K of tire under the load-carrying corresponding to its load-carrying index _irepresent, then according to Hooke's law, can obtain

K _ix _i＝M _ig(12)

Described formula (1) can be obtained by above formula (9), (10), (11), (12)

。

3. based on a vehicle load pick-up unit of TPMS, it is characterized in that, comprise TPMS and load-carrying processing module, wherein:

Described TPMS is used for the gas pressure intensity value P of collection vehicle under load condition in each tire ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and wirelessly by described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _nbe transferred to load-carrying processing module, wherein n is the tire total number of vehicle;

Described load-carrying processing module is for receiving described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and adopt following formula (1) to calculate load on each tire of vehicle,

Wherein, M _ibe the load on i-th tire, i is positive integer and 1≤i≤n, K _ifor the radial Static stiffness that i-th tire is corresponding under the load-carrying corresponding to its load-carrying index, g is acceleration of gravity, and π is circular constant, P _0igas pressure intensity value when being i-th tire zero load in tire, T _0igas temperature when being i-th tire zero load in tire, T _ibe the gas pressure intensity value of i-th tire under load condition, P _ibe the gas temperature angle value of i-th tire under load condition, R _ibe the external diameter of i-th tire, r _ibe the internal diameter of i-th tire, W _iit is the width of i-th tire;

Described load-carrying processing module is also for calculating the load M on each tire of vehicle ₁, M ₂..., M _nafter, adopt following formula (2) to calculate the airlift M of vehicle _z,

M _z＝α ₁M ₁+α ₂M ₂+…α _nM _n(2)

Wherein, α ₁, α ₂..., α _nbe respectively the weight coefficient of each tire, and α ₁+ α ₂+ ... α _n=1.

4. vehicle load pick-up unit as claimed in claim 3, it is characterized in that, described load-carrying processing module is especially by the load M on each tire of following process computation _i:

Tire is considered as hollow cylinder, and the external diameter of tire is R _i, the internal diameter of tire is r _i, tire the W of width _i, and the gas in tire is considered as ideal gas;

Under load condition, the shape generation deformation of tire, if the contact area on tire and ground be one long for L _i, wide be W _irectangle, the deflection that tire is vertically gone up is x _i, the angle that tire heart and described rectangle length direction two edge lines are formed is β _i, tire heart is h to the height on road surface _i, then have:

h _i＝R _i-x _i(3)

In tire, the volume change of gas is Δ V _i, then

ΔV _i＝ΔS _iW _i(5)

Wherein Δ S _ican be calculated by following formula (6),

By the length L of described rectangle _ibe considered as and angle beta _icorresponding arc length is equal, then have:

L _i＝R _iβ _i(7)

Can be obtained by above formula (3), (4), (5), (6), (7)

In above-mentioned formula (8), omit x _ibiquadratic item, can obtain

Again according to the Ideal-Gas Equation, can obtain

In tire, the volume change of gas is Δ V _ican be expressed as

ΔV _i＝-(V _i-V _0i)(11)

Tire after gassy is considered as the very large spring of a rigidity, the radial Static stiffness of tire under different load-carrying is considered as certain value, and with the radial Static stiffness K of tire under the load-carrying corresponding to its load-carrying index _irepresent, then according to Hooke's law, can obtain

K _ix _i＝M _ig(12)

Described formula (1) can be obtained by above formula (9), (10), (11), (12)

。

5. vehicle load pick-up unit as claimed in claim 3, it is characterized in that, described load-carrying processing module is arranged in the ECU of described vehicle or is arranged in remote monitoring center.

6. a vehicle real-time load method for supervising, is characterized in that, comprises the steps:

Vehicle load detection method as claimed in claim 1 is adopted to detect the current airlift of vehicle,

Remote monitoring center obtains the current airlift of vehicle, carry out analysis integrated after draw corresponding operating order, and described operational order is sent to the ECU of described vehicle by Wireless Data Transmission mode.

7. vehicle real-time load method for supervising as claimed in claim 6, it is characterized in that, described load-carrying processing module is arranged in described remote monitoring center, the gas pressure intensity value P that described TPMS gathers ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _nfirst be transferred to the ECU of vehicle by wireless short-range communication mode, then sent to the load-carrying processing module of described remote monitoring center by Wireless Data Transmission mode by the ECU of vehicle.

8. vehicle real-time load method for supervising as claimed in claim 7, it is characterized in that, the ECU of described vehicle is also by gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _nthe display screen of vehicle is sent to show.

9. a vehicle real-time load supervisory system, is characterized in that, comprises vehicle and remote monitoring center, and described vehicle comprises TPMS and ECU, wherein:

Described TPMS is used for the gas pressure intensity value P of collection vehicle under load condition in each tire ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and by wireless short-range communication mode by described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _nbe transferred to described ECU, wherein n is the tire total number of vehicle;

Described ECU is used for the described gas pressure intensity value P that will receive ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _ndescribed remote monitoring center is sent to by Wireless Data Transmission mode;

Described remote monitoring center comprises receiver module, load-carrying processing module, analysis module and sending module, wherein:

The described gas pressure intensity value P that described receiver module sends for receiving described ECU ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n;

Described load-carrying processing module is used for according to described gas pressure intensity value P ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, adopt following formula (1) to calculate load on each tire of vehicle,

Wherein, M _ibe the load on i-th tire, i is positive integer and 1≤i≤n, K _ifor the radial Static stiffness that i-th tire is corresponding under the load-carrying corresponding to its load-carrying index, g is acceleration of gravity, and π is circular constant, P _0igas pressure intensity value when being i-th tire zero load in tire, T _0igas temperature when being i-th tire zero load in tire, T _ibe the gas pressure intensity value of i-th tire under load condition, P _ibe the gas temperature angle value of i-th tire under load condition, R _ibe the external diameter of i-th tire, r _ibe the internal diameter of i-th tire, W _iit is the width of i-th tire;

Described load-carrying processing module is also for calculating the load M on each tire of vehicle ₁, M ₂..., M _nafter, adopt following formula (2) to calculate the airlift M of vehicle _z,

M _z＝α ₁M ₁+α ₂M ₂+…α _nM _n(2)

Wherein, α ₁, α ₂..., α _nbe respectively the weight coefficient of each tire, and α ₁+ α ₂+ ... α _n=1;

Described analysis module be used for the current airlift of vehicle carry out analysis integrated after draw corresponding operating order;

Described sending module is used for the ECU described operational order being sent to described vehicle by Wireless Data Transmission mode.

10. vehicle real-time load supervisory system as claimed in claim 9, it is characterized in that, described vehicle also comprises display screen, and described display screen is for showing the gas pressure intensity value P of described each tire of vehicle ₁, P ₂..., P _nwith gas temperature value T ₁, T ₂..., T _n, and for showing described operational order.