Tire inflation and deflation system based on wheel load sensing and vehicle

Abstract

The invention relates to a tire inflation and deflation system based on wheel load sensing and a vehicle, and the tire inflation and deflation system comprises a wheel load sensing unit which comprises a tire sensor for obtaining the tire temperature, the tire pressure and the acceleration data of each wheel position tire in real time, and a tire pressure controller for obtaining the tire load; the axle wheel end unit comprises a wheel end assembly mounted on an axle, a tire is mounted on the wheel end assembly, a tire sensor is arranged in the tire, the wheel end assembly is connected with a rotary air seal, and the rotary air seal is connected with an inflating valve of the tire through an air channel; the tire pressure adjusting unit comprises an air storage cylinder, an air inlet electromagnetic valve which is connected with the air storage cylinder and is used for inflating the tire and an air outlet electromagnetic valve which is used for deflating the tire, and the air inlet electromagnetic valve and the air outlet electromagnetic valve are both connected with the tire pressure controller. The tire pressure of the tire can be adjusted in real time according to the load change of the tire, the automatic inflation and deflation function or the manual inflation and deflation function can be achieved, the abnormal wear of the tire, especially the wear of a tire shoulder, is effectively relieved, and the service life of the tire is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of tire status monitoring, and in particular to a tire inflation and deflation system and a vehicle based on wheel load sensing. Background Art

[0002] At present, most tractor and cargo trucks consider operating costs, and are generally fully loaded on both the outbound and return trips. The load on each tire does not change much, so the air pressure of each tire can be basically maintained unchanged; only when the tire pressure is higher or lower than the normal pressure, manual deflation or inflation operations are performed to maintain the balance of wheel load and tire pressure.

[0003] However, for some special vehicles (such as hazardous chemicals tractor / cargo trucks, resource transport tractors), the outbound trip is generally fully loaded and the return trip is empty, so the wheel load difference between the outbound and return trips is large. Because wheel load and tire pressure correspond to each other, that is, high wheel load corresponds to high tire pressure, low wheel load corresponds to low tire pressure, and the ground contact performance of the tire is related to wheel load and tire pressure.

[0004] Therefore, when the tire pressure remains unchanged and the wheel load increases / decreases alternately, the tire's ground contact performance deteriorates, which may cause abnormal tire wear, especially the steering wheel will have uneven shoulder wear. Under different tire pressures and wheel loads, the tire's ground contact rectangularization is different, and the ground contact performance is different.

[0005] In addition, in order to save fuel, vehicle users usually set the tire pressure to 0.5-1 bar higher than the standard value. If the tire pressure is too high, the tire's ground contact performance will also deteriorate, which will reduce the rectangularization rate of the ground contact footprint and easily cause tire shoulder wear.

[0006] When the tire pressure is high, the tire contact area becomes smaller, the grip is reduced, and it may cause safety problems; when driving in desert areas, too high tire pressure will also reduce the vehicle's passability. Low tire pressure will also cause friction and heat, causing the tire to fail early, reducing its service life, and even causing a tire blowout. Summary of the invention

[0007] The embodiments of the present application provide a tire inflation and deflation system and a vehicle based on wheel load sensing to solve the problem in the related art that the tire pressure cannot be adaptively adjusted according to the change of wheel load when the vehicle is empty or fully loaded, resulting in abnormal tire wear and poor ground contact performance.

[0008] A first aspect of an embodiment of the present application provides a tire inflation and deflation system based on wheel load sensing, comprising:

[0009] A wheel load sensing unit, the wheel load sensing unit includes a tire sensor for acquiring tire temperature, tire pressure, and acceleration data of each wheel position in real time, and a tire pressure controller for processing the tire temperature, tire pressure, and acceleration data to obtain tire load;

[0010] A vehicle axle wheel end unit, the vehicle axle wheel end unit comprises a wheel end assembly mounted on the vehicle axle, a tire is mounted on the wheel end assembly, the tire sensor is built into the tire, the wheel end assembly is connected to a rotary air seal, and the rotary air seal is connected to the tire valve via an air path;

[0011] A tire pressure regulating unit, the tire pressure regulating unit includes an air cylinder, an air intake solenoid valve connected to the air cylinder and used to inflate the tire, and a deflation solenoid valve used to deflate the tire, the air intake solenoid valve and the deflation solenoid valve are both connected to the tire pressure controller.

[0012] In some embodiments: the tire pressure controller includes a processor and a memory, the processor is used to obtain the tire load of each wheel tire according to tire temperature, tire pressure, and acceleration data processing, and the memory is used to store the calibrated tire pressure corresponding to the tire load of each wheel tire;

[0013] When the absolute value of the difference between the calibrated tire pressure and the real-time tire pressure exceeds a set threshold, the tire pressure controller controls the tire pressure adjustment unit to inflate and deflate the tire so that the real-time tire pressure approaches the calibrated tire pressure.

[0014] In some embodiments: the tire sensor includes a temperature sensor, a pressure sensor, and an acceleration sensor built into the tire, and the temperature sensor, the pressure sensor, and the acceleration sensor are all connected to the tire pressure controller.

[0015] In some embodiments: the acceleration data monitored by the tire sensor includes the radial acceleration of the tire and the centripetal acceleration of the tire;

[0016] The tire pressure controller calculates the length of the tire contact footprint when the tire rolls according to the radial acceleration, and calculates the rolling speed of the tire when the tire rolls according to the centripetal acceleration;

[0017] The tire pressure controller establishes a functional relationship according to the footprint length, rolling speed and real-time tire pressure to obtain the vertical load on the tire.

[0018] In some embodiments: the tire pressure regulating unit includes a pressure-stabilizing valve and a pressure-boosting valve connected between the air cylinder and the intake solenoid valve, the pressure-stabilizing valve is used to stabilize the air pressure output by the air cylinder and then connect it to the pressure-boosting valve, and the pressure-boosting valve boosts the stabilized air pressure and then outputs it to the intake solenoid valve.

[0019] In some embodiments: the tire pressure regulating unit also includes a bridge-end solenoid valve connected to the vehicle axle, and the bridge-end solenoid valve is provided in plurality, and the plurality of bridge-end solenoid valves are respectively fixed at both ends of each vehicle axle, and the bridge-end solenoid valve is connected to the rotating air seal of each wheel-end assembly through an air path.

[0020] In some embodiments: the tire sensor includes a temperature sensor, a pressure sensor, and an acceleration sensor built into the tire;

[0021] The tire pressure controller converts tire temperature, tire pressure, and acceleration data collected by the temperature sensor, pressure sensor, and acceleration sensor into tire temperature values, tire pressure values, and acceleration values;

[0022] The tire pressure controller is connected to the automobile instrument and sends the tire temperature value, tire pressure value, acceleration value and tire load value to the automobile instrument for display.

[0023] In some embodiments: the tire pressure adjustment unit further includes a mode selection knob mounted on a vehicle instrument panel, the mode selection knob including an automatic mode and a manual mode;

[0024] When the mode selection knob is switched to the automatic mode and the vehicle speed is less than the set value, the tires are automatically inflated and deflated according to the tire load and tire pressure;

[0025] When the mode selection knob is switched to the manual mode and the vehicle is fully loaded, the tire pressure adjustment unit inflates the tire until the set pressure is reached;

[0026] When the mode selection knob is switched to the manual mode and the vehicle is unloaded, the tire pressure adjustment unit will deflate the tire until the set air pressure is reached.

[0027] In some embodiments: a plurality of tire sensors are provided, each of the plurality of tire sensors is configured with a different ID number, and each of the plurality of tire sensors is connected to the tire pressure controller via wireless communication.

[0028] A second aspect of the embodiments of the present application provides a vehicle, the vehicle comprising the tire inflation and deflation system based on wheel load sensing as described in any of the above embodiments.

[0029] The beneficial effects of the technical solution provided by this application include:

[0030] The embodiment of the present application provides a tire inflation and deflation system and a vehicle based on wheel load sensing. Since the tire inflation and deflation system based on wheel load sensing of the present application is provided with a wheel load sensing unit, the wheel load sensing unit includes a tire sensor for acquiring tire temperature, tire pressure, and acceleration data of tires at each wheel position in real time, and a tire pressure controller for deriving tire load based on tire temperature, tire pressure, and acceleration data processing; an axle wheel end unit, the axle wheel end unit includes a wheel end assembly mounted on the axle, a tire is mounted on the wheel end assembly, the tire sensor is built in the tire, the wheel end assembly is connected to a rotary air seal, and the rotary air seal is connected to the tire valve via an air path; a tire pressure regulating unit, the tire pressure regulating unit includes an air cylinder, and an intake solenoid valve connected to the air cylinder and inflating the tire and a deflation solenoid valve for deflation of the tire, the intake solenoid valve and the deflation solenoid valve are both connected to the tire pressure controller.

[0031] Therefore, the tire inflation and deflation system based on wheel load perception of the present application uses tire sensors to obtain tire temperature, tire pressure, and acceleration data of each wheel position in real time. The tire pressure controller uses tire temperature, tire pressure, and acceleration data to process and obtain tire load. The size of the tire load can reflect the load change of the vehicle. The tire pressure controller determines whether the current tire pressure is within the tire pressure threshold calibrated by the current tire load based on the tire load data. If the current tire pressure is less than the tire pressure threshold, the tire pressure controller opens the air intake solenoid valve, and the compressed air in the air reservoir enters the air intake solenoid valve and the rotating air seal in turn through the air path channel to inflate the tire until the tire pressure reaches the tire pressure threshold. If the current tire pressure is greater than the tire pressure threshold, the tire pressure controller first opens the deflation solenoid valve, and then sends a pulse signal to the air intake solenoid valve to open the valve. The valve releases the gas in the tire and then discharges it from the deflation solenoid valve to the atmosphere. The present application can adjust the tire pressure in real time according to the load change of the tire, and can realize automatic inflation and deflation or manual inflation and deflation functions, effectively reducing abnormal tire wear, especially shoulder wear, and improving the service life of the tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 A structural block diagram of a tire inflation and deflation system provided in an embodiment of the present application;

[0034] Figure 2 A schematic diagram of the air circuit fluid in the inflated state of the tire inflation and deflation system provided in an embodiment of the present application;

[0035] Figure 3A schematic diagram of the air flow of the tire inflation and deflation system in a deflated state provided in an embodiment of the present application;

[0036] Figure 4 This is a structural block diagram of the tire pressure controller provided in an embodiment of the present application.

[0037] Reference numerals:

[0038] 10. Wheel load sensing unit; 11. Tire sensor; 12. Tire pressure controller; 20. Axle wheel end unit; 21. Tire; 22. Rotary air seal; 23. Valve; 30. Tire pressure regulating unit; 31. Air reservoir; 32. Intake solenoid valve; 33. Deflation solenoid valve; 34. Air path; 35. Pressure regulating valve; 36. Boost valve; 37. Axle end solenoid valve; 40. Vehicle instrument. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0040] The embodiments of the present application provide a tire inflation and deflation system and a vehicle based on wheel load sensing, which can solve the problem in the related art that the tire pressure cannot be adaptively adjusted according to the change of wheel load when the vehicle is empty or fully loaded, resulting in abnormal tire wear and poor ground contact performance.

[0041] See also Figure 1 As shown, the first aspect of the embodiment of the present application provides a tire inflation and deflation system based on wheel load sensing, comprising:

[0042] The wheel load sensing unit 10 includes a tire temperature T and a tire pressure P of each wheel position tire 21 in real time. 0 , the tire sensor 11 of the acceleration A data, and the tire temperature T, the tire pressure P 0 , Acceleration A data processing to obtain tire load F Z Tire pressure controller 12.

[0043] The axle wheel end unit 20 includes a wheel end assembly mounted on the axle, a tire 21 is mounted on the wheel end assembly, a tire sensor 11 is built into the tire 21, and the wheel end assembly is connected to a rotary air seal 22, which is connected to a valve 23 of the tire 21 through an air path 34.

[0044] The tire pressure regulating unit 30 includes an air cylinder 31 , an air intake solenoid valve 32 connected to the air cylinder 31 for inflating the tire 21 , and a deflation solenoid valve 33 for deflation of the tire 21 . Both the air intake solenoid valve 32 and the deflation solenoid valve 33 are electrically connected to the tire pressure controller 12 .

[0045] The tire inflation and deflation system based on wheel load sensing in the embodiment of the present application uses the tire sensor 11 to obtain the tire temperature T and tire pressure P of each wheel position tire 21 in real time. 0 , acceleration A data, the tire pressure controller 12 uses tire temperature T, tire pressure P 0 , Acceleration A data processing to obtain tire load F Z , tire load F Z The size can reflect the load change of the vehicle.

[0046] The tire pressure controller 12 is based on the tire load F Z Data determines whether the current tire pressure is within the current tire load F Z Within the calibrated tire pressure threshold, if the current tire pressure is less than the tire pressure threshold, the tire pressure controller 12 opens the air intake solenoid valve 32, and the compressed air in the air reservoir 31 passes through the air path 34 and sequentially enters the air intake solenoid valve 32 and the rotary air seal 22 to inflate the tire 21 until the tire pressure reaches the tire pressure threshold.

[0047] If the current tire pressure is greater than the tire pressure threshold, the tire pressure controller first opens the deflation solenoid valve 33 and then sends a pulse signal to the intake solenoid valve 32 to open the valve mouth 23. The valve mouth 23 releases the gas in the tire 21 and then discharges it to the atmosphere from the deflation solenoid valve 33.

[0048] The present invention can adjust the tire pressure of the tire 21 in real time according to the load change of the tire 21, and can realize the automatic inflation and deflation or manual inflation and deflation function so that the tire pressure of the tire 21 is consistent with the tire load F of the tire 21. Z The tire 21 is matched to effectively reduce abnormal tire wear, especially shoulder wear, and increase the service life of the tire 21.

[0049] In some alternative embodiments: See Figure 4 As shown, the embodiment of the present application provides a tire inflation and deflation system based on wheel load sensing, wherein the tire pressure controller 12 of the tire inflation and deflation system includes a processor and a memory, and the processor is used to adjust the tire pressure according to the tire temperature T and the tire pressure P. 0 , acceleration A data processing to obtain the tire load F of each wheel position tire Z The memory is used to store the tire load F of each wheel position tire Z The corresponding calibrated tire pressure P.

[0050] When the calibrated tire pressure P is equal to the real-time tire pressure P 0When the absolute value of the difference between the tire pressure controller 12 and the tire pressure regulating unit 30 exceeds the set threshold, the tire pressure controller 12 controls the tire pressure regulating unit 30 to inflate and deflate the tire 21, so that the real-time tire pressure P of the tire 21 is 0 Tend to calibrate the tire pressure P until P0=P.

[0051] When the difference is positive (i.e. the calibrated tire pressure P is greater than the real-time tire pressure P 0 ), the tire pressure controller 12 opens the air path connected to the tire 21 by controlling the air intake solenoid valve 32 to inflate the tire 21 until the pressure in the tire 21 reaches the calibrated tire pressure P and then stops inflating.

[0052] When the difference is negative (i.e. the calibrated tire pressure P is less than the real-time tire pressure P 0 ), the tire pressure controller 12 opens the pressure relief passage by controlling the deflation solenoid valve 33 to discharge the gas in the tire 21 until the pressure in the tire 21 reaches the calibrated tire pressure P and then stops deflation.

[0053] In some alternative embodiments: See Figure 1 As shown, an embodiment of the present application provides a tire inflation and deflation system based on wheel load sensing, wherein the tire sensor 11 of the tire inflation and deflation system includes a temperature sensor, a pressure sensor, and an acceleration sensor built into the tire, and the temperature sensor, the pressure sensor, and the acceleration sensor are all connected to a tire pressure controller 12.

[0054] The temperature sensor, pressure sensor, and acceleration sensor are all connected to the tire pressure controller 12 by wireless means. The tire pressure controller 12 uses the tire temperature T and tire pressure P collected by the temperature sensor, pressure sensor, and acceleration sensor to 0 The acceleration A data is converted into tire temperature value, tire pressure value, and acceleration value and then sent to the automobile instrument 40 for display.

[0055] In some alternative embodiments: See Figure 1 As shown, the embodiment of the present application provides a tire inflation and deflation system based on wheel load sensing. The acceleration data monitored by the tire sensor 11 of the tire inflation and deflation system includes the radial acceleration and the centripetal acceleration of the tire. The tire pressure controller 12 calculates the footprint length a of the tire when it rolls according to the radial acceleration, and calculates the rolling speed V of the tire when it rolls according to the centripetal acceleration. The tire pressure controller 12 calculates the tire pressure according to the footprint length a, the rolling speed v and the real-time tire pressure P 0 Establish a functional relationship to obtain the vertical load F on the tire Z .

[0056] Vertical load F on tire Z =f(P0, v, a);

[0057] Where: P 0is the real-time tire pressure; V is the rolling speed of the tire when it rolls; a is the length of the footprint of the tire when it rolls.

[0058] Imprint length

[0059] Where:

[0060] a is the length of the tire's contact patch when it rolls;

[0061] R0 is the free rolling radius of the tire;

[0062] F Z is the tire vertical force;

[0063] C Z is the vertical stiffness of the tire;

[0064] a1 and b1 are the coefficients to be fitted;

[0065] m and n are the number of fits to be performed.

[0066] In some alternative embodiments: See Figures 1 to 3 As shown, an embodiment of the present application provides a tire inflation and deflation system based on wheel load sensing, wherein the tire pressure regulating unit of the tire inflation and deflation system includes a pressure-stabilizing valve 35 and a pressure-boosting valve 36 connected between an air reservoir 31 and an air intake solenoid valve 32, wherein the pressure-stabilizing valve 35 is used to stabilize the air pressure output by the air reservoir 31 and then connect to the pressure-boosting valve 36, and the pressure-boosting valve 36 boosts the stabilized air pressure and then outputs it to the air intake solenoid valve 32.

[0067] The tire pressure regulating unit 30 further includes a bridge end solenoid valve 37 connected to the vehicle axle. A plurality of bridge end solenoid valves 37 are provided. The plurality of bridge end solenoid valves 37 are respectively fixed at both ends of each vehicle axle. The bridge end solenoid valves 37 are connected to the rotary air seal 22 of each wheel end assembly through the air passage 34. Each bridge end solenoid valve 37 is respectively connected to the rotary air seal 22 of the wheel end assembly of a single tire 21 to inflate the single tire 21.

[0068] The gas pressure in the air reservoir 31 is in a changing state, and the air pressure range is 800-1200 kPa. The pressure stabilizing valve 35 stabilizes the compressed air discharged from the air reservoir 31 to 600 kPa. The pressure stabilizing valve 35 is used to prevent the pressure fluctuation of the air reservoir 31 from adversely affecting the inflation of the tire 21. After the compressed air stabilized by the pressure stabilizing valve 35 enters the boosting valve 36, the boosting valve 36 boosts the compressed air to 1200 kPa to meet the pressure requirement of the tire 21.

[0069] See also Figure 2As shown, when the tire pressure regulating unit 30 inflates the axle wheel end unit 20, the air flow direction between the tire pressure regulating unit 30 and the axle wheel end unit 20 is as follows: the compressed air in the air storage cylinder 31 passes through the pressure regulating valve 35, the boost valve 36, the air intake solenoid valve 32, the air path channel 34, the axle end solenoid valve 37, the air path channel 34, the rotary air seal 22, and the valve nozzle 23 in sequence, and then enters the tire 21 to inflate the tire 21, thereby increasing the tire pressure of the tire 21.

[0070] See also Figure 3 As shown, when the tire pressure regulating unit 30 deflates the axle wheel end unit 20, the air flow direction between the tire pressure regulating unit 30 and the axle wheel end unit 20 is as follows: the compressed air in the tire 21 passes through the valve nozzle 23, the rotary air seal 22, the air path channel 34, the axle end solenoid valve 37, the air path channel 34, and the deflation solenoid valve 33 in sequence and then is discharged into the atmosphere, thereby reducing the tire pressure of the tire 21.

[0071] In some alternative embodiments: See Figure 1 As shown, an embodiment of the present application provides a tire inflation and deflation system based on wheel load sensing, wherein the tire pressure adjustment unit 30 of the tire inflation and deflation system further comprises a mode selection knob installed on a vehicle instrument 40, and the mode selection knob comprises an automatic mode and a manual mode.

[0072] When the mode selection knob is switched to automatic mode and the vehicle speed is less than the set value, the tires are automatically inflated and deflated according to the tire load and tire pressure. When the mode selection knob is switched to manual mode and the vehicle is fully loaded, the tire pressure adjustment unit inflates the tires until the set pressure is reached. When the mode selection knob is switched to manual mode and the vehicle is unloaded, the tire pressure adjustment unit deflates the tires until the set pressure is reached.

[0073] There are multiple tire sensors 11, and the specific number of tire sensors 11 is the same as the number of tires 21 of the vehicle. Each tire 21 is adapted to the tire sensor 11. In order for the tire pressure controller 12 to accurately distinguish the signal data wirelessly transmitted by each tire sensor 11, the multiple tire sensors 11 are configured with different ID numbers, and the multiple tire sensors 11 are connected to the tire pressure controller 12 through wireless communication.

[0074] A second aspect of the embodiments of the present application provides a vehicle, wherein the vehicle uses the tire inflation and deflation system based on wheel load sensing as described in any of the above embodiments.

[0075] How it works

[0076] The embodiment of the present application provides a tire inflation and deflation system and a vehicle based on wheel load sensing. Since the tire inflation and deflation system based on wheel load sensing of the present application is provided with a wheel load sensing unit 10, the wheel load sensing unit 10 includes a tire sensor 11 for obtaining tire temperature, tire pressure, and acceleration data of tires 21 of each wheel position in real time, and a tire pressure controller 12 for obtaining tire load according to tire temperature, tire pressure, and acceleration data processing;

[0077] The axle wheel end unit 20 comprises a wheel end assembly mounted on the axle, a tire 21 is mounted on the wheel end assembly, the tire sensor 11 is built into the tire 21, the wheel end assembly is connected to a rotary air seal 22, and the rotary air seal 22 is connected to a tire valve 23 through an air passage 34;

[0078] The tire pressure regulating unit 30 includes an air cylinder 31 , an air intake solenoid valve 32 connected to the air cylinder 31 and used to inflate the tire 21 , and a deflation solenoid valve 33 used to deflate the tire 21 . Both the air intake solenoid valve 32 and the deflation solenoid valve 33 are connected to the tire pressure controller 12 .

[0079] Therefore, the tire inflation and deflation system based on wheel load perception of the present application utilizes the tire sensor 11 to obtain the tire temperature, tire pressure, and acceleration data of the tire 21 of each wheel position in real time, and the tire pressure controller 12 utilizes the tire temperature, tire pressure, and acceleration data to process and obtain the tire load. The size of the tire load can reflect the load change of the vehicle.

[0080] The tire pressure controller 12 determines whether the current tire pressure is within the tire pressure threshold calibrated by the current tire load based on the tire load data. If the current tire pressure is less than the tire pressure threshold, the tire pressure controller 12 opens the air intake solenoid valve 32, and the compressed air in the air cylinder 31 passes through the air path 34 and enters the air intake solenoid valve 32 and the rotary air seal 22 in turn to inflate the tire 21 until the tire pressure reaches the tire pressure threshold.

[0081] If the current tire pressure is greater than the tire pressure threshold, the tire pressure controller 12 first opens the deflation solenoid valve 33, and then sends a pulse signal to the intake solenoid valve 32 to open the valve 23. The valve 23 releases the gas in the tire 21 and then discharges it to the atmosphere from the deflation solenoid valve 33. The present application can adjust the tire pressure of the tire 21 in real time according to the load change of the tire 21, and can realize automatic inflation and deflation or manual inflation and deflation functions, effectively reducing abnormal wear of the tire 21, especially shoulder wear, and increasing the service life of the tire 21.

[0082] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0083] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0084] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A tire inflation and deflation system based on wheel load sensing, characterized in that: include: A wheel load sensing unit (10), the wheel load sensing unit (10) comprising a tire sensor (11) for acquiring tire temperature, tire pressure and acceleration data of tires (21) at each wheel position in real time, and a tire pressure controller (12) for processing the tire temperature, tire pressure and acceleration data to obtain tire load; A vehicle axle wheel end unit (20), the vehicle axle wheel end unit (20) comprising a wheel end assembly mounted on the vehicle axle, a tire (21) mounted on the wheel end assembly, the tire sensor (11) being built into the tire (21), the wheel end assembly being connected to a rotary air seal (22), the rotary air seal (22) being connected to a valve (23) of the tire (21) via an air passage (34); A tire pressure regulating unit (30), the tire pressure regulating unit (30) comprising an air storage cylinder (31), an air intake solenoid valve (32) connected to the air storage cylinder (31) for inflating the tire (21), and a deflation solenoid valve (33) for deflation of the tire (21), the air intake solenoid valve (32) and the deflation solenoid valve (33) both being connected to the tire pressure controller (12).

2. A tire inflation and deflation system based on wheel load sensing as claimed in claim 1, characterized in that: The tire pressure controller (12) comprises a processor and a memory, wherein the processor is used to obtain the tire load of each wheel position tire (21) according to tire temperature, tire pressure and acceleration data processing, and the memory is used to store the calibrated tire pressure corresponding to the tire load of each wheel position tire (21); When the absolute value of the difference between the calibrated tire pressure and the real-time tire pressure exceeds a set threshold, the tire pressure controller (12) controls the tire pressure adjustment unit (30) to control the inflation and deflation of the tire (21) so that the real-time tire pressure of the tire (21) tends to the calibrated tire pressure.

3. A tire inflation and deflation system based on wheel load sensing as claimed in claim 1, characterized in that: The tire sensor (11) comprises a temperature sensor, a pressure sensor and an acceleration sensor which are built into the tire, and the temperature sensor, the pressure sensor and the acceleration sensor are all connected to a tire pressure controller (12).

4. A tire inflation and deflation system based on wheel load sensing as claimed in claim 1, characterized in that: The acceleration data monitored by the tire sensor (11) includes the radial acceleration of the tire and the centripetal acceleration of the tire; The tire pressure controller (12) calculates the length of the contact patch of the tire (21) when it rolls based on the radial acceleration, and calculates the rolling speed of the tire (21) when it rolls based on the centripetal acceleration; The tire pressure controller (12) establishes a functional relationship based on the footprint length, rolling speed and real-time tire pressure to obtain the vertical load on the tire (21).

5. A tire inflation and deflation system based on wheel load sensing as claimed in claim 1, characterized in that: The tire pressure regulating unit (30) further comprises a pressure stabilizing valve (35) and a pressure boosting valve (36) connected between the air reservoir (31) and the air intake solenoid valve (32); the pressure stabilizing valve (35) is used to stabilize the air pressure output by the air reservoir (31) and then connect to the pressure boosting valve (36); the pressure boosting valve (36) boosts the stabilized air pressure and then outputs it to the air intake solenoid valve (32).

6. A tire inflation and deflation system based on wheel load sensing as claimed in claim 5, characterized in that: The tire pressure regulating unit (30) further comprises a bridge end solenoid valve (37) connected to the vehicle axle, wherein a plurality of the bridge end solenoid valves (37) are provided, and the plurality of bridge end solenoid valves (37) are respectively fixed at the two ends of each vehicle axle, and the bridge end solenoid valves (37) are connected to the rotary air seal (22) of each wheel end assembly through an air passage.

7. A tire inflation and deflation system based on wheel load sensing as claimed in claim 1, characterized in that: The tire sensor (11) includes a temperature sensor, a pressure sensor, and an acceleration sensor built into the tire; The tire pressure controller (12) converts tire temperature, tire pressure, and acceleration data collected by the temperature sensor, the pressure sensor, and the acceleration sensor into tire temperature values, tire pressure values, and acceleration values; The tire pressure controller (12) is connected to the automobile instrument and sends the tire temperature value, tire pressure value, acceleration value and tire load value to the automobile instrument (40) for display.

8. A tire inflation and deflation system based on wheel load sensing as claimed in claim 7, characterized in that: The tire pressure adjustment unit (30) further comprises a mode selection knob installed on the automobile instrument (40), wherein the mode selection knob comprises an automatic mode and a manual mode; When the mode selection knob is switched to the automatic mode and the vehicle speed is less than a set value, the tire (21) is automatically inflated and deflated according to the tire load and tire pressure; When the mode selection knob is switched to the manual mode and the vehicle is fully loaded, the tire pressure adjustment unit inflates the tire (21) until the set air pressure is reached; When the mode selection knob is switched to the manual mode and the tire is unloaded, the tire pressure adjustment unit deflates the tire (21) until the set air pressure is reached.

9. A tire inflation and deflation system based on wheel load sensing as claimed in claim 1, characterized in that: The tire sensors (11) are provided in plurality, each of the plurality of tire sensors (11) is provided with a mutually different ID number, and each of the plurality of tire sensors (11) is connected to the tire pressure controller (12) via wireless communication.

10. A vehicle, characterized in that: The vehicle comprises the tire inflation and deflation system based on wheel load sensing according to any one of claims 1 to 9.

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