A load-matched tire self-adaptive automatic inflation and deflation control system and method

Abstract

The application provides a load-matched tire self-adaptive automatic inflation and deflation control system and method, and belongs to the technical field of automatic inflation and deflation control of tires.The system comprises a vehicle-mounted control box and a tire.The vehicle-mounted control box is connected with a load measuring device, a tire pressure monitoring device and a tire automatic inflation and deflation device.The vehicle-mounted control box obtains the current load of the tire measured by the load measuring device, obtains the current air pressure value of the tire measured by the tire pressure monitoring device, inputs the current load of the tire into a pre-stored tire wear amount mathematical model to obtain an optimal tire air pressure value, calculates the amount of inflation or deflation according to the relationship between the current air pressure value of the tire and the optimal tire air pressure value, and controls the tire automatic inflation and deflation device to perform inflation or deflation operation on the tire.The tire wear amount mathematical model is trained offline, the optimal tire air pressure value is calculated online, and the tire is subjected to self-adaptive inflation and deflation operation in real time, so that the tire wear can be effectively reduced, and the economy of the tire can be greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of automatic tire inflation and deflation control technology, specifically relating to a load-matching adaptive automatic tire inflation and deflation control system and method. Background Technology

[0002] As the only part of a vehicle in contact with the ground, the tire plays a crucial role in supporting the vehicle, mitigating impacts from the ground, and transmitting friction. Therefore, tires are an essential component of a vehicle. Tire pressure, a critical parameter, is related to the vehicle load and determines tire wear and rolling resistance. In other words, tire pressure and load must be matched to ensure good tire performance and prevent tire wear.

[0003] Currently, commercial vehicles often experience large and frequent variations in tire load between loaded and unloaded states. Since service stations cannot provide real-time and accurate inflation / deflation services, tires are often used with a fixed maximum pressure that matches the full load. This results in a mismatch between tire pressure adjustment under unloaded and other load conditions and the tire's wear and rolling resistance performance, leading to abnormal tire wear and a significant reduction in tire life.

[0004] Tires perform optimally when tire pressure is matched to load. Commercial vehicles have a wide range of load variations, and due to the inconvenience of inflating and deflating, tire pressure is often used at the highest pressure under maximum load. However, when the vehicle is not fully loaded, the tire pressure will be mismatched with the load, and tire performance cannot be guaranteed.

[0005] This is a shortcoming of the existing technology. Therefore, it is very necessary to provide a load-matching adaptive automatic tire inflation and deflation control system and method to address the above-mentioned defects in the existing technology. Summary of the Invention

[0006] The existing tires have optimal performance when the tire pressure is matched with the load. However, commercial vehicles have a large load variation range, and due to the inconvenience of inflation and deflation, the tire pressure is often the highest pressure at the maximum load. When the vehicle is not fully loaded, the tire pressure will be mismatched with the load, which cannot guarantee the tire performance. The present invention provides a load-matching adaptive automatic inflation and deflation control system and method for tires to solve the above technical problems.

[0007] In a first aspect, the present invention provides a load-matching tire adaptive automatic inflation and deflation control system, including an on-board control box and a tire; The vehicle control box is connected to a load measuring device, a tire pressure monitoring device, and an automatic tire inflation / deflation device. The vehicle control box obtains the current tire load measured by the load measuring device and the current tire pressure value measured by the tire pressure monitoring device. It then inputs the current tire load into a pre-saved mathematical model of tire wear to obtain the optimal tire pressure value. Based on the relationship between the current tire pressure value and the optimal tire pressure value, it calculates the required inflation or deflation amount and controls the automatic tire inflation / deflation device to inflate or deflate the tire.

[0008] Furthermore, the vehicle control box contains a vehicle ECU and a first communication CAN line; The vehicle ECU is connected to the load measuring device, tire pressure monitoring device, and automatic tire inflation / deflation device via the first communication CAN line.

[0009] Furthermore, the tire pressure monitoring device includes an MES integrated sensor module, an RF receiver module, and a second communication CAN line; The MES integrated sensor module includes an accelerometer, a first pressure sensor, and a transmitter unit; The acceleration sensor and the first pressure sensor are located at the tire. The accelerometer sensor collects the tire acceleration and sends a start signal to the first pressure sensor; After the first pressure sensor is activated, it collects the tire pressure value and sends the tire pressure value to the RF receiver module via wireless signal; The FR receiver module converts the received tire pressure wireless signal into an electrical signal, which is then transmitted to the vehicle control box via the second communication CAN line. The MES integrated sensor module uses micro-mechanical sensors, with an embedded acceleration sensor and a first pressure sensor.

[0010] Furthermore, the load measuring device includes a second pressure sensor, a height sensor, and a third communication CAN line; The second pressure sensor is located at the bellows of the tire's air spring, and the height sensor is located at both ends of the tire's air bladder. The load measuring device uses a second pressure sensor to collect the air pressure inside the bellows as the tire airbag stiffness under the current gas conditions, and a height sensor to collect the compression height of the tire airbag. Based on the tire airbag stiffness and compression height, the current tire load is calculated and then transmitted to the vehicle control box via a third communication CAN line. The height sensor is an ultrasonic sensor.

[0011] Furthermore, the automatic tire inflation / deflation device includes an air reservoir, a solenoid valve, and an on-board air source; One end of the air tank is connected to the vehicle's air source, and the other end is connected to the tire via a solenoid valve; The solenoid valve is also connected to the vehicle control box via the fourth communication CAN line; The solenoid valve receives instructions from the vehicle control box and controls the air tank to inflate and deflate the tires.

[0012] Secondly, the present invention provides a load-matching adaptive automatic tire inflation / deflation control method, comprising the following steps: S1. Based on the tire wear data collected from the test vehicle under different tire pressures and loads, a mathematical model of tire wear was constructed through offline training. S2. Obtain the current tire load and current tire pressure value, input the current tire load into the tire wear mathematical model to obtain the optimal tire pressure value, and then calculate the required inflation or deflation amount based on the relationship between the current tire pressure value and the optimal tire pressure value, and control the tire to perform inflation or deflation operations online.

[0013] Furthermore, the specific steps of step S1 are as follows: S11. Select a set number of test vehicles equipped with tires of the same specifications and parameters and with the same configuration; S12. Select typical tire pressure and typical tire load for matching, and use the matched typical tire pressure and typical load as test conditions to assign to the test vehicles, with each test vehicle having different test conditions. S13. Start the test vehicle with the assigned test conditions and conduct a road test of the same mileage, and measure the tire wear. S14. Fit the tire wear data under different test conditions to obtain a mathematical model of tire wear data under different tire pressures and different tire loads, and obtain the fitted surface.

[0014] Furthermore, in step S13, a tread depth gauge is used to measure the tire wear of each test vehicle.

[0015] Further, in step S14, the tire wear under different test conditions is fitted to the following mathematical model of tire wear: Where J is the wear amount per 10,000 kilometers of the tire's set mileage, F is the tire load, and P is the tire pressure value.

[0016] Furthermore, the specific steps of step S2 are as follows: S21. The on-board control box acquires the current tire load collected periodically by the load measuring device; S22. The vehicle control box periodically collects the current tire pressure value through the tire pressure monitoring device; S23. The vehicle control box inputs the current tire load into the tire wear mathematical model, outputs the optimal tire pressure value, and compares the relationship between the current tire pressure value and the optimal tire pressure value. If the difference between the current tire pressure and the optimal tire pressure is less than or equal to a set threshold, proceed to step S24; If the difference between the current tire pressure and the optimal tire pressure is greater than a set threshold, proceed to step S25; S24. Determine that tire pressure adjustment is not required, return to step S21; S25. Compare the current tire pressure with the optimal tire pressure. If the current tire pressure is greater than the optimal tire pressure, proceed to step S26; If the current tire pressure is less than the optimal tire pressure, proceed to step S27; S26. Calculate the current tire pressure and the optimal tire pressure as the deflation amount, and control the tire to deflate according to the deflation amount through the automatic tire inflation and deflation device, and return to step S21. S27. Calculate the optimal tire pressure value and the current tire pressure value as the inflation amount, and control the tire to inflate according to the inflation amount through the automatic tire inflation and deflation device, and return to step S21.

[0017] The beneficial effects of this invention are as follows: The load-matching tire adaptive automatic inflation and deflation control system and method provided by this invention calculates the optimal tire pressure value online through an offline trained mathematical model of tire wear, and performs adaptive inflation and deflation operations on the tire in real time, which can effectively reduce tire wear and greatly improve tire economy.

[0018] Furthermore, the design principle of this invention is reliable, the structure is simple, and it has a very wide range of application prospects.

[0019] Therefore, it is evident that the present invention has outstanding substantive features and significant progress compared with the prior art, and the beneficial effects of its implementation are also obvious. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of an embodiment of the load-matching adaptive automatic tire inflation / deflation control system of the present invention.

[0022] Figure 2 This is a schematic diagram of another embodiment of the load-matching tire adaptive automatic inflation / deflation control system of the present invention.

[0023] Figure 3 This is a schematic flowchart of an embodiment of the load-matching adaptive automatic tire inflation / deflation control method of the present invention.

[0024] Figure 4 This is a schematic flowchart of another embodiment of the load-matching adaptive automatic tire inflation / deflation control method of the present invention.

[0025] In the diagram, 1-Vehicle control box; 2-Tire; 3-Load measuring device; 4-Tire pressure monitoring device; 5-Automatic tire inflation / deflation device; 6-Vehicle ECU; 7-Acceleration sensor; 8-First pressure sensor; 9-RF receiver module; 10-Second pressure sensor; 11-Altitude sensor; 12-Air tank; 13-Solenoid valve; 14-Vehicle air source. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0027] Example 1: like Figure 1 As shown, the present invention provides a load-matching adaptive automatic tire inflation and deflation control system, including an on-board control box 1 and a tire 2; The vehicle control box 1 is connected to a load measuring device 3, a tire pressure monitoring device 4, and an automatic tire inflation / deflation device 5; The vehicle control box 1 acquires the current tire load measured by the load measuring device 3, acquires the current tire pressure value measured by the tire pressure monitoring device 4, and inputs the current tire load into the pre-saved tire wear mathematical model to obtain the optimal tire pressure value. Then, based on the relationship between the current tire pressure value and the optimal tire pressure value, it calculates the required inflation or deflation amount and controls the automatic tire inflation / deflation device 5 to perform inflation or deflation operations on the tire.

[0028] Example 2: like Figure 1 As shown, the present invention provides a load-matching adaptive automatic tire inflation and deflation control system, including an on-board control box 1 and a tire 2; The vehicle control box 1 is connected to a load measuring device 3, a tire pressure monitoring device 4, and an automatic tire inflation / deflation device 5; The vehicle control box 1 acquires the current tire load measured by the load measuring device 3, acquires the current tire pressure value measured by the tire pressure monitoring device 4, and inputs the current tire load into the pre-saved tire wear mathematical model to obtain the optimal tire pressure value. Then, it calculates the required inflation or deflation amount based on the relationship between the current tire pressure value and the optimal tire pressure value, and controls the automatic tire inflation / deflation device 5 to perform inflation or deflation operations on the tire. like Figure 2 As shown, the vehicle control box 1 contains a vehicle ECU 6 and a first communication CAN line; The vehicle ECU 6 is connected to the load measuring device 3, the tire pressure monitoring device 4, and the automatic tire inflation / deflation device 5 via the first communication CAN line; The tire pressure monitoring device 4 includes an MES integrated sensor module, an RF receiver module 9, and a second communication CAN line; The MES integrated sensor module includes an accelerometer 7, a first pressure sensor 8, and a transmitting unit; Acceleration sensor 7 and first pressure sensor 8 are installed at tire 2; Accelerometer 7 collects tire acceleration and sends a start signal to first pressure sensor 8; After the first pressure sensor 8 is activated, it collects the tire pressure value and sends the tire pressure value wireless signal to the RF receiver module 9 through the transmitting unit. The FR receiver module 9 converts the received tire pressure value wireless signal into an electrical signal, and then sends it to the vehicle control box 1 via the second communication CAN line; the MES integrated sensor module adopts a micro-mechanical sensor, with an embedded acceleration sensor 7 and a first pressure sensor 8. The load measuring device 4 includes a second pressure sensor 10, a height sensor 11, and a third communication CAN line; The second pressure sensor 10 is located at the bellows of the air spring of the tire 2, and the height sensor 11 is located at both ends of the airbag of the tire 2. The load measuring device 4 collects the air pressure inside the bellows through the second pressure sensor 10 as the tire airbag stiffness under the current gas conditions, and collects the compression height of the tire airbag through the height sensor 11. It calculates the current load of the tire based on the tire airbag stiffness and compression height, and then sends it to the vehicle control box 1 through the third communication CAN line. The height sensor 11 is an ultrasonic sensor. The automatic tire inflation / deflation device 5 includes an air reservoir 12, a solenoid valve 13, and an on-board air source 14; One end of the air tank 12 is connected to the vehicle air source 14, and the other end is connected to the tire 2 through the solenoid valve 13; Solenoid valve 13 is also connected to vehicle control box 1 via the fourth communication CAN line; The solenoid valve 13 receives the command from the vehicle control box 1 and controls the air tank 12 to inflate and deflate the tire 2.

[0029] Example 3: like Figure 3 As shown, the present invention provides a load-matching adaptive automatic tire inflation / deflation control method, comprising the following steps: S1. Based on the tire wear data collected from the test vehicle under different tire pressures and loads, a mathematical model of tire wear was constructed through offline training. S2. Obtain the current tire load and current tire pressure value, input the current tire load into the tire wear mathematical model to obtain the optimal tire pressure value, and then calculate the required inflation or deflation amount based on the relationship between the current tire pressure value and the optimal tire pressure value, and control the tire to perform inflation or deflation operations online.

[0030] Example 4: like Figure 4 As shown, the present invention provides a load-matching adaptive automatic tire inflation / deflation control method, comprising the following steps: S1. Based on the tire wear data collected from the test vehicle under different tire pressures and loads, an offline mathematical model of tire wear is constructed through training. The specific steps of step S1 are as follows: S11. Select a set number of test vehicles equipped with tires of the same specifications and parameters and with the same configuration; for example, you can select 6 cargo test vehicles equipped with tires of a certain brand with a specification of 12R22.5. S12. Select typical tire pressures and typical tire loads for matching, and use the matched typical tire pressures and typical loads as test conditions, assigning them to the test vehicles, with each test vehicle having different test conditions; for example, select tire pressures of 600, 700, 800, 900, and 1000 kPa as typical tire pressures, and select tire loads of 2500, 2800, 3100, 3400, and 3700 kg as typical loads; S13. Conduct road tests on the same mileage for the test vehicles assigned to the test conditions, and measure the tire wear; use a tread depth gauge to measure the tire wear of each test vehicle; for example, conduct a 10-kilometer road test with typical tire pressure and typical load combination, and the wear statistics are shown in Table 1: Table 1 S14. Fit the tire wear data under different test conditions to obtain a mathematical model of tire wear data under different tire pressures and loads, and obtain the fitted surface; fit the tire wear data under different test conditions to the following mathematical model of tire wear data: Where J is the tire wear rate over 100,000 kilometers in mm, F is the tire load in kg, and P is the tire pressure in kPa. S2. Obtain the current tire load and current tire pressure value, input the current tire load into the tire wear mathematical model to obtain the optimal tire pressure value, and then calculate the required inflation or deflation amount based on the relationship between the current tire pressure value and the optimal tire pressure value, and control the tire to perform inflation or deflation operations online. The specific steps of step S2 are as follows: S21. The on-board control box acquires the current tire load collected periodically by the load measuring device; S22. The vehicle control box periodically collects the current tire pressure value through the tire pressure monitoring device; S23. The vehicle control box inputs the current tire load into the tire wear mathematical model, outputs the optimal tire pressure value, and compares the relationship between the current tire pressure value and the optimal tire pressure value. If the difference between the current tire pressure and the optimal tire pressure is less than or equal to a set threshold, proceed to step S24; If the difference between the current tire pressure and the optimal tire pressure is greater than a set threshold, proceed to step S25; S24. Determine that tire pressure adjustment is not required, return to step S21; S25. Compare the current tire pressure with the optimal tire pressure. If the current tire pressure is greater than the optimal tire pressure, proceed to step S26; If the current tire pressure is less than the optimal tire pressure, proceed to step S27; S26. Calculate the current tire pressure and the optimal tire pressure as the deflation amount, and control the tire to deflate according to the deflation amount through the automatic tire inflation and deflation device, and return to step S21. S27. Calculate the optimal tire pressure value and the current tire pressure value as the inflation amount, and control the tire to inflate according to the inflation amount through the automatic tire inflation and deflation device, and return to step S21.

[0031] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the invention should also be covered within the protection scope of the invention. Therefore, the protection scope of the invention should be determined by the scope of the claims.

Claims

1. A load-matching adaptive automatic tire inflation / deflation control system, characterized in that, Including the vehicle control box and tires; The vehicle control box is connected to a load measuring device, a tire pressure monitoring device, and an automatic tire inflation / deflation device. The vehicle control box obtains the current tire load measured by the load measuring device and the current tire pressure value measured by the tire pressure monitoring device. It then inputs the current tire load into the pre-saved tire wear mathematical model to obtain the optimal tire pressure value. Based on the relationship between the current tire pressure value and the optimal tire pressure value, it calculates the required inflation or deflation amount and controls the automatic tire inflation / deflation device to inflate or deflate the tire. The load measuring device includes a second pressure sensor, a height sensor, and a third communication CAN line; The second pressure sensor is located at the bellows of the tire's air spring, and the height sensor is located at both ends of the tire's air bladder. The load measuring device collects the air pressure inside the bellows through the second pressure sensor as the tire airbag stiffness under the current gas conditions, collects the compression height of the tire airbag through the height sensor, calculates the current load of the tire based on the tire airbag stiffness and compression height, and then sends it to the vehicle control box through the third communication CAN line. The automatic tire inflation / deflation device includes an air tank, a solenoid valve, and an on-board air source; One end of the air tank is connected to the vehicle's air source, and the other end is connected to the tire via a solenoid valve; The solenoid valve is also connected to the vehicle control box via the fourth communication CAN line; The solenoid valve receives instructions from the vehicle control box and controls the air tank to inflate and deflate the tires. The pre-saved mathematical model of tire wear is obtained through the following methods: S1. Based on the tire wear data collected from the test vehicle under different tire pressures and loads, a mathematical model of tire wear was constructed through offline training. The specific steps of step S1 are as follows: S11. Select a set number of test vehicles equipped with tires of the same specifications and parameters and with the same configuration; S12. Select typical tire pressure and typical tire load for matching, and use the matched typical tire pressure and typical load as test conditions to assign to the test vehicles, with each test vehicle having different test conditions. S13. Start the test vehicle with the assigned test conditions and conduct a road test of the same mileage, and measure the tire wear. S14. Fit the tire wear data under different test conditions to obtain a mathematical model of tire wear data under different tire pressures and different tire loads, and obtain the fitted surface.

2. The load-matching adaptive automatic tire inflation / deflation control system as described in claim 1, characterized in that, The vehicle control box contains the vehicle ECU and the first communication CAN line; The vehicle ECU is connected to the load measuring device, tire pressure monitoring device, and automatic tire inflation / deflation device via the first communication CAN line.

3. The load-matching adaptive automatic tire inflation / deflation control system as described in claim 1, characterized in that, The tire pressure monitoring device includes an MES integrated sensor module, an RF receiver module, and a second communication CAN line; The MES integrated sensor module includes an accelerometer, a first pressure sensor, and a transmitter unit; The acceleration sensor and the first pressure sensor are located at the tire. The accelerometer sensor collects the tire acceleration and sends a start signal to the first pressure sensor; After the first pressure sensor is activated, it collects the tire pressure value and sends the tire pressure value to the RF receiver module via wireless signal; The FR receiver module converts the received tire pressure value wireless signal into an electrical signal, which is then sent to the vehicle control box via the second communication CAN line.

4. A load-matching adaptive automatic tire inflation / deflation control method, applicable to the load-matching adaptive automatic tire inflation / deflation control system of any one of claims 1-3, characterized in that, Includes the following steps: S1. Based on the tire wear data collected from the test vehicle under different tire pressures and loads, a mathematical model of tire wear was constructed through offline training. S2. Obtain the current tire load and current tire pressure value, input the current tire load into the tire wear mathematical model to obtain the optimal tire pressure value, and then calculate the required inflation or deflation amount based on the relationship between the current tire pressure value and the optimal tire pressure value, and control the tire to perform inflation or deflation operations online. The specific steps of step S1 are as follows: S11. Select a set number of test vehicles equipped with tires of the same specifications and parameters and with the same configuration; S12. Select typical tire pressure and typical tire load for matching, and use the matched typical tire pressure and typical load as test conditions to assign to the test vehicles, with each test vehicle having different test conditions. S13. Start the test vehicle with the assigned test conditions and conduct a road test of the same mileage, and measure the tire wear. S14. Fit the tire wear data under different test conditions to obtain a mathematical model of tire wear data under different tire pressures and different tire loads, and obtain the fitted surface.

5. The load-matching adaptive automatic tire inflation / deflation control method as described in claim 4, characterized in that, In step S13, the tire wear of each test vehicle is measured using a tread depth gauge.

6. The load-matching adaptive automatic tire inflation / deflation control method as described in claim 4, characterized in that, The specific steps of step S2 are as follows: S21. The vehicle control box acquires the current tire load collected periodically by the load measurement device; S22. The vehicle control box periodically collects the current tire pressure value through the tire pressure monitoring device; S23. The vehicle control box inputs the current tire load into the tire wear mathematical model, outputs the optimal tire pressure value, and compares the relationship between the current tire pressure value and the optimal tire pressure value. If the difference between the current tire pressure and the optimal tire pressure is less than or equal to a set threshold, proceed to step S24; If the difference between the current tire pressure and the optimal tire pressure is greater than a set threshold, proceed to step S25; S24. Determine that tire pressure adjustment is not required, return to step S21; S25. Compare the current tire pressure with the optimal tire pressure. If the current tire pressure is greater than the optimal tire pressure, proceed to step S26; If the current tire pressure is less than the optimal tire pressure, proceed to step S27; S26. Calculate the current tire pressure and the optimal tire pressure as the deflation amount, and control the tire to deflate according to the deflation amount through the automatic tire inflation and deflation device, and return to step S21. S27. Calculate the optimal tire pressure value and the current tire pressure value as the inflation amount, and control the tire to inflate according to the inflation amount through the automatic tire inflation and deflation device, and return to step S21.

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