TWI565602B - A method of judging vehicle load abnormality - Google Patents

Description

Method for judging vehicle load anomaly

The invention relates to a detection method applied to a vehicle, in particular to a method for judging an abnormality of a vehicle load.

As the public's awareness of driving safety rises, many car manufacturers begin to deploy detection devices that monitor driving safety on a vehicle, such as a vehicle display that records the progress of the vehicle, or a tire pressure monitoring system that senses the tire pressure of the vehicle (Tire pressure monitoring). System, referred to as TPMS). Wherein, in the vehicle load abnormality detection, the so-called vehicle load abnormality is when the vehicle is loaded with a load, and when a tire on the vehicle is deformed by the load of the vehicle, the inner tube space of the tire is made smaller. The tire pressure is raised to support the load of the vehicle.

Today's vehicle load anomaly detection is mainly based on a general Hell formula to obtain a tire load data of the tire. However, due to the general complexity of the tire structure, the GM Haier formula gives the tire load data, but the GM Haier formula does not take into account the actual deformation of the tire during the estimation of the tire load data, and it is easy to produce the tire load. The situation does not match the actual situation.

The main object of the present invention is to solve the problem that the conventional detection method does not take into account the actual change of the tire and is prone to errors.

In order to achieve the above object, the present invention provides a method for determining an abnormality of a vehicle load, which is applied to a vehicle having a plurality of tires, each of the tires including at least one representative of the tire. Each of the tires is equipped with a tire pressure detecting unit, and each of the tire pressure detecting units normally detects the in-cylinder state of one of the tires and outputs a tire tire pressure every other detection time. The method comprises the steps of: step one, receiving one of the tire tire pressures generated by the tire pressure detecting unit at a plurality of detecting times, and calculating a variation amount of each tire tire pressure in each of the detecting times, Converting into a slope data; in step 2, obtaining the slope data of one of the tires and the slope data of the other tire, and comparing the slope data of the tires, if the slope data is the same, the vehicle is normal, If the slope data is different, the vehicle is tilted, and the slope data is continuously determined to be a positive value. If the value is positive, the process proceeds to the next step. If the value is negative, the process proceeds to step 1. The third step is to use a tire to sink. The amount calculation formula calculates the tire tire pressure and the tire parameter obtained at the end to obtain a tire deformation amount, and calculates the tire tire pressure finally obtained by using a load calculation formula. The tire parameter is calculated to obtain a tire load data; and in step 4, the tire load data and the tire deformation amount are compared by using a tire abnormal condition, and the vehicle load is determined if the tire load data and the tire deformation amount meet the tire abnormal condition abnormal.

In an embodiment, the formula for calculating the amount of tire sinking is: Wherein, R, V0, P0 and b are respectively one of the tire parameters of the tire, R is a tire radius, V0 is a tire empty original volume, P0 is a tire empty original tire pressure, b is a tire The width of the section, f is the amount of deformation of the tire.

In an embodiment, the load calculation formula is: Wherein, P, b and R are respectively one of the tire parameters of the tire, P is a tire tire pressure, b is a tire section width, R is a tire radius, f is the tire deformation amount, and W is the tire Load data.

In one embodiment, the tire abnormal condition is a tire sinking threshold for comparing the tire deformation amount, and a tire load threshold for comparing the tire load data. In an embodiment, the step 2 further includes a sub-step of starting to determine the vehicle load abnormality: comparing the slope data with a slope abnormality reference, and entering the step if the value of the slope data is greater than or equal to the slope abnormality reference. 3. If the value of the slope data is less than the slope abnormality reference, repeat step two.

In an embodiment, before the step one is performed, a sub-step of obtaining the original state of the tire is included: maintaining the vehicle in an unloaded state, and using a tire volume calculation formula to obtain a tire unloaded original volume of each of the tires. Further, the tire volume is calculated as: V ₀ = πR ² b where R is a tire radius, b is a tire section width, and the V0 is a tire empty original volume.

In one embodiment, a sub-step of providing tire parameters is included prior to execution of the step one.

Through the above method of the present invention, the following features are compared with the conventional ones:

1. The invention determines the abnormality of the vehicle load based on the tire deformation amount and the tire load data, and more accurately conforms to the tire state of the vehicle, and can provide an accurate judgment result to avoid accidents caused by misjudgment.

1‧‧‧ Vehicles

11, 13‧‧‧ tires

111‧‧‧ tire pressure detection unit

12‧‧‧Electronic devices

A‧‧‧ Tire grounding mark length

B‧‧‧ tire section width

F‧‧‧ tyre deformation

M1, M2‧‧‧ slope data

P‧‧‧ tire pressure

R‧‧‧ tire radius

R1‧‧‧ Slope Abnormality Benchmark

T‧‧‧Test time

V ₀ ‧‧‧ tire empty original volume

S1, S10, S11, S2, S21, S22, S3, S4‧‧

1 is a schematic view showing the implementation of a vehicle according to an embodiment of the present invention.

2 is a schematic view of a tire parameter according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of an implementation flow of an embodiment of the present invention.

FIG. 4 is a schematic diagram of an implementation flow of another embodiment of the present invention.

5-1 is a schematic view of a tire tire pressure according to an embodiment of the present invention.

Fig. 5-2 is a schematic view showing the tire tire pressure of the vehicle which is not tilted according to an embodiment of the present invention.

Fig. 5-3 is a schematic view showing the tire tire pressure of the vehicle tilted according to an embodiment of the present invention.

The detailed description and technical contents of the present invention will now be described with reference to the following drawings: Referring to FIG. 1 and FIG. 2, the method for vehicle load abnormality of the present invention is applied to a vehicle 1 having a plurality of tires 11, each having The tire 11 includes at least one tire parameter representing the characteristics of the tire 11, and please refer to FIG. 2. The tire parameter of the present invention may be the specification data before the tire 11 is manufactured, such as a tire radius R and a tire grounding mark length. a, a tire section width b, a tire empty original volume V0 and the like. Furthermore, each of the tires 11 of the present invention is further equipped with a tire pressure detecting unit 111, and each of the tire pressure detecting units 111 normally detects the in-cylinder state of one of the assembled tires 11, and each of the tires The pressure detecting unit 111 outputs a tire tire pressure P every other detection time T (not shown), and each of the tire pressure detecting units 111 may be an intra-fetal sensing type or a fetal feeling in an embodiment. Measurement type. Moreover, in an embodiment of the present invention, the vehicle 1 can be provided with one and each of the The tire pressure detecting unit 111 is connected to the electronic device 12, and the method of the present invention can be loaded into the electronic device 12 by means of a program logic language.

Referring to FIG. 3, the method for loading an abnormality of the vehicle of the present invention includes the following steps: Step 1 S1, accepting one of the tire tires generated by the tire pressure detecting unit 111 at a plurality of detecting times T Pressing P, and calculating the amount of change of each tire tire pressure P in each of the detection time T, converting into a slope data M1; step 2 S2, determining whether the slope data M1 is a positive value, if a positive value enters the next In one step, if it is a negative value, step 2 is re-executed; in step 3 S3, the tire tire pressure P and the tire parameter are calculated by using a tire sinking amount calculation formula to obtain a tire deformation amount f, and a The load calculation formula calculates the tire load P and the tire parameters obtained in the tire to obtain a tire load data; in step 4 S4, the tire load data and the tire deformation amount f are compared using a tire abnormal condition, if the tire load data And the tire deformation amount f is in accordance with the tire abnormal condition, that is, the vehicle 1 load abnormality is determined.

Specifically, in the initial implementation of the present invention, the electronic device 12 is first used to connect one of the tire pressure detecting units 111 mounted on the vehicle 1 , and the tire pressure detecting unit 111 is continuously obtained for continuous multiple detection. The plurality of tire tire pressures P generated by the time T, and then calculating the amount of change of the tire tire pressure P obtained during the above-mentioned detection time T, converting into a slope data M1 (as shown in FIG. 5-1), and proceeding to step two S2. In the second step S2, the electronic device 12 can be used to determine whether the slope data M1 is a positive value. If the value is positive, the vehicle 1 is in a state in which the load is continuously increased and proceeds to step S3, and if it is a negative value, The vehicle 1 is in a state where the load is continuously reduced. In step 3 S3, the tire tire pressure P and the tire parameters obtained by calculating the tire sinking amount calculation formula are first calculated to obtain a tire deformation amount. The calculation formula of the tire sinking amount is mainly used to calculate the overall deformation amount of the tire 11 after loading, and the formula for calculating the sinking amount of the tire is as follows: Wherein R, V0, P0 and b are respectively one of the tire parameters of the tire 11, R is the tire radius, V0 is the original empty volume of the tire, P0 is a tire empty original tire pressure, b is the The tire section width, f is the tire deformation. After obtaining the tire deformation amount f, the tire load data is obtained by calculating the load calculation formula, and the load calculation formula is as follows: Wherein, P, b, and R are respectively one of the tire parameters of the tire 11, P is the tire tire pressure finally obtained, b is a tire section width, R is a tire radius, and f is the tire deformation amount. W is the tire load data. According to the present invention, after the tire deformation amount calculation formula and the load calculation formula respectively obtain the tire deformation amount f and the tire load data, the process proceeds to step S4, and the tire deformation amount f is compared with the tire abnormal condition. According to the tire load data, if the tire load data and the tire deformation amount f meet the tire abnormal condition, the vehicle 1 load abnormality is determined. Further, the tire abnormal condition may be that the tire manufacturer allows the tire 11 to change during use during the design of the tire, such as the volume deformation amount of the tire 11 or the tire pressure change after the tire load. Specifically, in an embodiment, the tire abnormal condition includes a tire sinking threshold for comparing the tire deformation amount f, and a tire load threshold for comparing the tire load data.

With reference to FIG. 4 and FIG. 5-1, in an embodiment, the step S2 further includes a sub-step S21 of starting to determine the vehicle load abnormality: using a slope abnormal reference R1 and the slope data M1. If the value of the slope data M1 is greater than or equal to the slope abnormality reference R1, the process proceeds to step S3, and if the value of the slope data M1 is less than the slope abnormality reference, the step S2 is re-executed. More specifically, during the implementation, when the vehicle 1 is smoothly loaded with the load, the slope data M1 generated by each of the tires 11 is detected to rise steadily. When the vehicle 1 suddenly increases the load, the slope data M1 detected by each of the tires 11 generates a drastic change and is greater than or equal to the slope abnormality reference R1. At this time, the present invention can initially determine the possibility of the vehicle load abnormality and enter. This step is three S3.

In addition, in conjunction with FIG. 5-3, in an embodiment, the step S2 may further include a sub-step S22 of determining the tilt of the vehicle: obtaining the slope data M1 of one of the tires 11 and another tire. Another slope data M2 of 13 is compared with the slope data M1 and M2 of the tires 11, 13 . If the slope data M1 and M2 are the same, it is determined that the vehicle is normal, and if the slope data M1 and M2 are phase The difference is judged as the vehicle is tilted. More specifically, when the vehicle 1 suddenly increases the load on one side of the vehicle 1, the tire 13 disposed on the corresponding side is subjected to a larger load pressure than the tire 11, and the tire of the tire 13 is caused. The internal pressure is significantly increased, so that the slope data M2 is greater than the slope data M1 calculated by the tire 11, so that the slope data M1 and M2 are inconsistent, and it can be determined that the vehicle 1 has a tilting event.

In addition, referring to FIG. 4, in an embodiment, before the step S1 is performed, the sub-step S11 of acquiring the original state of the tire may be included: maintaining the vehicle 1 in an unloaded state, using a tire volume. The calculation formula obtains the tire empty original volume V _{0 of} each of the tires 11. The steps of the present embodiment are mainly for the vehicle 1 to replace the new tire 11 and re-measure the in-cylinder volume after each of the tires 11 is inflated and in an unloaded state, so that the judgment made by the present invention can be better in the future. It conforms to the specific implementation state of the tire 11. Furthermore, the tire volume is calculated as: V ₀ = πR ² b where R is the tire radius, b is the tire section width, and the V _{0 is} the tire no-load original volume. As described above, in order to more accurately measure the number of tires sold in the market today, in an embodiment, the present invention may further include a sub-step S10 of providing tire parameters before the step S1 is performed.

In summary, the method for determining the abnormality of the vehicle load of the present invention firstly receives a plurality of tire tire pressures generated by a tire pressure detecting unit at a plurality of detection times, and calculates a change amount of the tire tire pressures into a slope data. After that, it is judged whether the slope data is a positive value. If it is a positive value, the tire tire pressure and the tire parameter are calculated by using a tire sinking amount calculation formula to obtain a tire deformation amount, and a load calculation formula is used. Finally, the tire tire pressure and the tire parameters are calculated to obtain a tire load data, and the tire load data and the tire deformation amount are compared by using a tire abnormal condition, and if the tire load data and the tire deformation amount meet the tire abnormality The condition determines that the vehicle load is abnormal. Therefore, it is easy to have a judgment misalignment in order to solve the conventional judgment method without considering the actual tire state.

The present invention has been described in detail above, but the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Variations and modifications are still within the scope of the patents of the present invention.

S1, S10, S2, S3, S4‧‧ steps

Claims (8)

A method for determining an abnormality of a vehicle load is applied to a vehicle having a plurality of tires, each of the tires comprising at least one tire parameter representing a characteristic of the tire, each of the tires being equipped with a tire pressure detecting unit, each of the tires The tire pressure detecting unit normally detects the in-cylinder state of one of the tires and outputs a tire tire pressure every other detection time. The method comprises the steps of: step one, accepting one of the tire pressure detecting units in plural Detecting the tire pressure generated by the time, and calculating the amount of change of each tire tire pressure in each of the detection times, converting into a slope data; and step 2, obtaining the slope data of one of the tires and another The slope data of the tire is compared with the slope data of the tire. If the slope data is the same, the vehicle is normal. If the slope data is different, the vehicle is tilted, and the slope data is continuously determined. Positive value, if it is positive value, go to the next step, if it is negative value, re-execute step one; step three, use a tire sinking amount calculation formula to obtain the last Tire tire pressure and the tire parameters are calculated to obtain a tire deformation amount, and a tire load calculation method is used to calculate the tire tire pressure and the tire parameter obtained by using a load calculation formula; and step 4, using a tire abnormal condition Comparing the tire load data and the tire deformation amount, if the tire load data and the tire deformation amount meet the tire abnormal condition, the vehicle load abnormality is determined. The method for determining an abnormality of a vehicle load according to claim 1, wherein the calculation formula of the tire sinking amount is: Wherein, R, V ₀ , P ₀ and b are respectively one of the tire parameters of the tire, R is a tire radius, V ₀ is a tire empty original volume, and P ₀ is a tire empty original tire pressure, b is the width of a tire section, and f is the amount of deformation of the tire. A method for determining a vehicle load abnormality as claimed in claim 1 or 2, wherein the load calculation formula is: Wherein, P, b and R are respectively one of the tire parameters of the tire, P is a tire tire pressure, b is a tire section width, R is a tire radius, f is the tire deformation amount, and W is the tire Load data. The method for determining an abnormality of a vehicle load according to claim 1, wherein the tire abnormal condition is a tire sinking threshold for comparing the tire deformation amount, and a tire load threshold for comparing the tire load data. The method for determining an abnormality of a vehicle load according to claim 1, wherein the step 2 further comprises a sub-step of starting to determine a vehicle load abnormality: comparing the slope data with a slope abnormality reference, if the value of the slope data is greater than or If it is equal to the slope abnormality reference, the process proceeds to step 3. If the value of the slope data is less than the slope abnormality reference, step 2 is performed again. The method for determining an abnormality of a vehicle load according to claim 1, wherein before the step 1 is executed, a sub-step of obtaining an original state of the tire is included: maintaining the vehicle in an unloaded state, and obtaining each of the tire volume calculation formulas The tire's tire has an empty original volume. The method for determining an abnormality of a vehicle load according to claim 6, wherein the tire volume calculation formula is: V ₀ = πR ² b wherein R is a tire radius, b is a tire section width, and the V0 is a tire No load of original volume. A method for determining a vehicle load anomaly as described in claim 1, wherein a sub-step of providing tire parameters is included prior to execution of the step one.