Real-time pressure maintaining device of new energy automobile tire and control method

Abstract

The invention discloses a real-time pressure maintaining device of a new energy automobile tire and a control method. The real-time pressure maintaining device comprises a hub motor arranged in a hub, a tire pressure sensor arranged on the inner side of the tire and an inflating valve arranged on the inner side of the tire. A rotating shaft is arranged in the hub and connected with the rotating end of the hub motor. An air pump machine is arranged on the side wall of the rotating shaft, the output end of the air pump machine is connected with an electromagnetic regulating valve, and the electromagnetic regulating valve is connected with an inflating valve of a tire through a pipeline; one end of the rotating shaft is provided with a conductive slip ring, the conductive slip ring comprises a rotor arranged in the rotating shaft, one end of the rotor is electrically connected with the air pump machine, the other end of the rotor is sleeved with a rotor bearing, the outer end of the rotor bearing is provided with a stator end cover, the other end of the stator end cover is provided with a stator, and the stator is provided with a stator interface connected with a vehicle body power supply and a signal end. Real-time pressure maintaining of the tire can be achieved, the service life of the tire is prolonged, and the reliability of the tire is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile tire pressure maintenance, and specifically to a real-time pressure maintaining device and control method for new energy automobile tires. Background Art

[0002] With the continuous development of new energy vehicles, the performance and functional requirements of various vehicle components are increasing. In actual use, the stability of tire pressure has an important impact on the driving safety, comfort and energy efficiency of the vehicle. Traditional tire pressure monitoring and maintenance devices cannot be well integrated with wheel hub motors and have functional limitations. Existing tire pressure maintenance devices lack linkage functions with wheel hub motors. Ordinary tire pressure monitoring systems may only be able to monitor pressure changes, but when responding to pressure changes, such as timely inflation, deflation, or filling tire sealant when tire pressure drops sharply, operations are not real-time enough. Summary of the invention

[0003] The purpose of the present invention is to provide a real-time pressure-maintaining device and control method for tires of new energy vehicles. The present invention can achieve real-time pressure maintenance of tires and improve the service life and reliability of tires.

[0004] The technical solution of the present invention is as follows: a real-time pressure-maintaining device for a tire of a new energy vehicle, comprising a hub motor arranged in a wheel hub, a tire pressure sensor arranged on the inner side of the tire and an air valve arranged on the inner side of the tire; a rotating shaft is arranged in the wheel hub, and the rotating shaft is connected to the rotating end of the hub motor; an air pump is arranged on the side wall of the rotating shaft, and an electromagnetic regulating valve is connected to the output end of the air pump, and the electromagnetic regulating valve is connected to the air valve of the tire via a pipeline; a conductive slip ring is arranged at one end of the rotating shaft, and the conductive slip ring comprises a rotor arranged inside the rotating shaft, one end of the rotor is electrically connected to the air pump, and the other end of the rotor is sleeved with a rotor bearing, the outer end of the rotor bearing is provided with a stator end cover, and the other end of the stator end cover is provided with a stator, and the stator is provided with a stator interface connected to the power supply and signal end of the vehicle body.

[0005] In the aforementioned real-time pressure-maintaining device for new energy vehicle tires, a connecting seat is provided on the side wall of the rotating shaft, a plurality of hole groups are provided on the connecting seat, and the connecting seat is connected to the air pump machine screws through the hole groups.

[0006] In the aforementioned real-time pressure maintaining device for new energy vehicle tires, the electromagnetic regulating valve includes an electromagnetic valve seat, and the two ends of the electromagnetic valve seat are respectively provided with a first pipeline connection end cover and a second pipeline connection end cover, and the air pump is connected to one end of the electromagnetic valve seat through the first pipeline connection end cover; a valve port is provided in the electromagnetic valve seat, and a slide is provided at the side end of the electromagnetic valve seat, and a coil is provided in the slide, and a power supply end electrically connected to the coil is provided on the side of the slide, a fixed iron core is fixed at one end of the slide, and a first spring is connected to the fixed iron core, and one end of the first spring is connected to a moving iron core valve core inserted in the coil, and the moving iron core valve core is driven along the slide to cooperate with the valve port by the coil after power is supplied.

[0007] In the aforementioned real-time pressure-maintaining device for new energy vehicle tires, a safety valve and a valve nozzle interface are connected in sequence between the electromagnetic regulating valve and the valve nozzle.

[0008] In the aforementioned real-time pressure maintaining device for new energy vehicle tires, the safety valve includes a third pipe connecting end cover connected to the pipe, the third pipe connecting end cover is connected to an inner cavity, a second spring is fixed at one end of the inner cavity, and a valve stem with one end fixed in the inner cavity is arranged in the second spring; a safety valve seat is arranged at the bottom of the inner cavity, an air hole is arranged in the safety valve seat, and a valve flap cooperating with the valve stem is arranged at the upper end of the air hole.

[0009] In the aforementioned real-time pressure maintaining device for new energy vehicle tires, a tire repair fluid tank is provided at one end of the air pump.

[0010] The control method of the real-time pressure maintaining device of the above-mentioned new energy vehicle tire, the tire pressure sensor is responsible for transmitting real-time tire pressure information, and the air pump controls the gas flow through the electromagnetic regulating valve; when the tire pressure sensor detects that the tire pressure becomes high, the air pump is used to deflate; when the tire pressure sensor detects that the tire pressure is slightly reduced, the air pump is started to realize dynamic inflation.

[0011] In the control method of the real-time pressure-maintaining device of the tire of the new energy vehicle mentioned above, when the tire pressure sensor detects a sharp drop in tire pressure, the air pump draws tire repair fluid from the tire repair fluid tank and fills it into the tire.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The present invention can monitor the tire pressure in real time through the tire pressure sensor, and realize dynamic inflation through the air pump machine, so as to ensure that the tire always maintains the appropriate tire pressure, which helps to improve the driving safety, fuel economy or cruising range of the car. The present invention can accurately control the flow of gas or tire repair fluid through the setting of the electromagnetic regulating valve, ensure the flow is adjusted during the process of inflation, deflation or filling of tire repair fluid, and improve the working efficiency and accuracy of the pressure maintaining device. The present invention makes full use of the space around the hub motor by setting the air pump machine below the rotating end of the hub motor and realizing electrical connection through a conductive slip ring. It is not necessary to open up a large installation space for the pressure maintaining device separately, which helps to improve the space utilization of the vehicle and will not have a significant impact on the overall layout of the vehicle. In addition, the present invention can prevent structural damage, explosion and leakage through the setting of the safety valve to ensure safe operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of the present invention;

[0015] Figure 2 is a cross-sectional view of the present invention;

[0016] Figure 3 is a side view of the present invention;

[0017] Figure 4 It is a schematic diagram of a conductive slip ring of the present invention;

[0018] Figure 5 It is a schematic diagram of the electromagnetic regulating valve of the present invention;

[0019] Figure 6 It is the principle diagram of the present invention;

[0020] Figure 7 It is the work flow chart of the present invention.

[0021] The markings in the attached drawings are: 1. tire; 2. wheel hub; 3. valve; 4. rotating shaft; 5. tire pressure sensor; 6. air pump; 7. conductive slip ring; 8. tire repair fluid tank; 9. electromagnetic regulating valve; 10. connecting seat; 11. rotor; 12. rotor bearing; 13. stator end cover; 14. stator; 15. electromagnetic valve seat; 16. first pipeline connecting end cover; 17. second pipeline connecting end cover; 18. valve port; 19. slideway; 20. coil; 21. power supply end; 22. fixed iron core; 23. first spring; 24. moving iron core valve core; 25. safety valve; 26. valve mouth interface; 27. third pipeline connecting end cover; 28. inner cavity; 29. ​​second spring; 30. valve stem; 31. safety valve seat; 32. air hole; 33. valve disc. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0023] Embodiment: A real-time pressure-maintaining device for a tire of a new energy vehicle, such as Figure 1-5 As shown, the wheel hub motor is arranged in the wheel hub 2, the tire pressure sensor 5 is arranged on the inner side of the tire 1, and the valve 3 is arranged on the inner side of the tire 1. The wheel hub motor and the wheel hub 2 are fixed by bolt connection. The bolt connection can be easily disassembled and reassembled, and is convenient for maintenance and replacement of parts. The bolt connection can achieve uniform distribution of load, reduce local stress concentration, and extend the service life of the connection. Due to its detachability, it is convenient for inspection, maintenance and replacement in the later stage.

[0024] The wheel hub 2 is provided with a rotating shaft 4, which is connected to the rotating end of the wheel hub motor. The side wall of the rotating shaft 4 is provided with an air pump 6, and the side wall of the rotating shaft 4 is provided with a connecting seat 10, which is provided with two hole groups. The connecting seat 10 is screwed to the air pump 6 through the hole group, which is convenient for disassembly and reassembly, and is convenient for maintenance and replacement of parts. The screws and related accessories are relatively low in cost, which reduces the material cost of the overall connection. The screw connection has good tensile strength and shear strength, can withstand large loads, and ensure the stability of the connection. This fixing form allows the vehicle to be inflated and deflated in real time while in motion.

[0025] The working principle of the air pump machine 6 is as follows: when the motor is started, the impeller of the fan starts to rotate. The shape of the impeller is designed so that the gas is driven along the edge of the impeller during the rotation. The rotation of the impeller causes the gas to be sucked into the inlet of the pump body, forming a negative pressure area. The gas is accelerated during the flow process and the speed gradually increases. As the gas enters the inside of the pump body, the rotating impeller further compresses the gas, causing its pressure to increase. In this process, the kinetic energy of the gas is converted into pressure energy. The compressed gas is discharged through the outlet of the pump body. Because of the flow of the gas and the pressure difference, continuous gas flow is achieved.

[0026] One end of the rotating shaft 4 is provided with a conductive slip ring 7 electrically connected to the air pump 6. The conductive slip ring 7 includes a rotor 11 arranged inside the rotating shaft 4. One end of the rotor 11 is electrically connected to the air pump 6. The other end of the rotor 11 is sleeved with a rotor bearing 12. The outer end of the rotor bearing 12 is provided with a stator end cover 13. The rotor 11 is rotatably connected to the stator end cover 13 via the rotor bearing 12. The other end of the stator end cover 13 is provided with a stator 14. The stator 14 is provided with a stator interface connected to the power supply and signal end of the vehicle body. The stator 14 is connected to the power supply and signal end. The air pump 6 and other devices in the pressure-maintaining device need electricity. With the basic characteristics of the conductive slip ring 7 that can transmit electric energy and signals in the rotating tire 1, the electrical connection between the fixed vehicle body part and the rotating wheel part is realized, ensuring that the equipment can continuously and stably obtain the required electric energy and signals during operation.

[0027] The output end of the air pump 6 is connected to an electromagnetic regulating valve 9, which is connected to the valve 3 via a pipeline. The electromagnetic regulating valve 9 includes an electromagnetic valve seat 15, and the two ends of the electromagnetic valve seat 15 are respectively provided with a first pipeline connection end cover 16 and a second pipeline connection end cover 17. The air pump 6 is connected to one end of the electromagnetic valve seat 15 via the first pipeline connection end cover 16. A valve port 18 is provided in the electromagnetic valve seat 15, and a slide 19 is provided at the side end of the electromagnetic valve seat 15. A coil 20 is provided in the slide 19, and a power supply end 21 electrically connected to the coil 20 is provided on the side of the slide 19. A fixed iron core 22 is fixed at one end of the slide 19, and a first spring 23 is connected to the fixed iron core 22. One end of the first spring 23 is connected to a moving iron core valve core 24 inserted in the coil 20. The moving iron core valve core 24 is driven by the energized coil 20 to cooperate with the valve port 18 along the slide 19, thereby controlling the gas flow. The electromagnetic regulating valve 9 is located between the air pump 6 and the safety valve 25. As a component for adjusting the air-hydraulic pressure, it changes different flow control states according to the control signal transmitted by the vehicle electronic control unit. When the tire pressure of the vehicle tire 1 is insufficient and needs to be filled with air, the system calculates the condition of the tire 1, and the electronic control unit drives the electromagnetic regulating valve 9 to inflate the tire 1; when the vehicle tire 1 has a puncture, the flow is adjusted by changing the voltage or current that drives them, ensuring the flow control of the tire 1 when filling with different substances, so that the device can maintain stable operation.

[0028] A safety valve 25 and a valve nozzle interface 26 are connected in sequence between the electromagnetic regulating valve 9 and the valve nozzle 3. The safety valve 25 includes a third pipe connection end cap 27 connected to the pipeline, the third pipe connection end cap 27 is connected to an inner cavity 28, a second spring 29 is fixed at one end of the inner cavity 28, and a valve stem 30 with one end fixed in the inner cavity 28 is arranged in the second spring 29. A safety valve seat 31 is arranged at the bottom of the inner cavity 28, an air hole 32 is arranged in the safety valve seat 31, and a valve flap 33 cooperating with the valve stem 30 is arranged at the upper end of the air hole 32. The safety valve 25 is located between the electromagnetic regulating valve 9 and the valve nozzle interface 26, and as a component to ensure the safety and stability of the gas-liquid pressure of the device, the safety valve 25 is combined with the pipeline through the third pipe connection end cap 27, and the safety valve 25 is connected to the electromagnetic regulating valve 9 and the valve nozzle interface 26. The safety valve 25 is an important safety device, and its main function is to protect the pressure vessel and the pipeline system. Specific functions include: Preventing excessive pressure: The safety valve 25 will automatically open when the system pressure reaches the set value to release excess gas or liquid, thereby preventing the pressure from rising to a dangerous level. By discharging excess pressure, the safety valve 25 can prevent structural damage, explosion and leakage of the equipment, ensuring the safe operation of the equipment.

[0029] A tire sealant tank 8 is provided at one end of the air pump 6 for storing tire sealant. When the vehicle tire 1 loses pressure, the air pump 6 extracts tire sealant from the tank to seal the tire. After the tire sealant is filled into the tire 1 in an oxygen-free state, when the tire 1 leaks, the tire sealant is discharged and reacts instantly with air to generate a high molecular polymer with certain plasticity, certain elasticity and strength, thereby plugging the leak.

[0030] The real-time pressure-maintaining device uses the tire pressure sensor 5 as a data receiving end, which is used to monitor and report the air pressure of the tire 1 during the driving process of the vehicle, provide a data basis for the pressure-maintaining device, and help the driver receive tire pressure information. The air pump 6 is used as an actuator; the conductive slip ring 7 is used as a power supply element of the air pump 6, the fixed end is connected to the vehicle power supply, and the rotating end is connected to the air pump 6 through the gear shaft hole, providing power and signals for the air pump 6; the electromagnetic regulating valve 9 and the safety valve 25 are used to adjust the flow of gas and tire repair fluid and ensure that the pipeline pressure is within the normal range, as control elements; the tire repair fluid tank 8 is used as an auxiliary element, which is used to load the tire repair fluid and is connected to the air pump 6 to extract when needed.

[0031] like Figure 6-7 As shown, the control method of the real-time pressure maintaining device of the new energy vehicle tire is:

[0032] First, the tire pressure sensor 5 transmits real-time tire pressure information to the on-board ECU, and then the on-board ECU receives and processes the information, sends a signal to the tire pressure alarm, and transmits a control signal to the air pump 6 in the wheel hub 2. The main transmission mode of the pressure-maintaining device is composed of pneumatic transmission and hydraulic transmission, with the air pump 6 as the actuator. The air pump 6 is fixed inside the wheel hub 2 and controls the flow of gas or tire repair fluid through the electromagnetic regulating valve 9. When the tire temperature rises and the tire pressure of the tire 1 becomes higher, and the ground adhesion becomes lower, the device can be used to deflate; when the tire pressure sensor 5 detects that the tire pressure has dropped slightly, the device is activated to achieve dynamic inflation; when the tire pressure sensor 5 detects that the tire pressure has dropped sharply, while the tire pressure alarm is activated, the electronic control unit will control the inflation and deflation control device to select to draw tire repair fluid from the tire repair fluid tank 8 to fill the tire 1, to ensure that the driver has sufficient time to react.

[0033] Specifically, the real-time pressure maintaining device is set to two modes, mode one under normal conditions and modes two and three under abnormal conditions.

[0034] Normal operating mode 1: The tire pressure and vehicle are normal, reaching the standard vehicle design mileage and normal energy consumption. The tire pressure should be between the low pressure threshold P1 and the high pressure threshold P2 (in bar).

[0035] Abnormal situation:

[0036] (1) Mode 2: When the tire pressure is lower than P1, the friction between the tire and the ground will increase, so that it will take a longer distance to stop when braking. Too low tire pressure will also increase the contact area between the tire 1 and the ground, posing a hidden danger of tire blowout, and increase energy consumption, reducing the life of the tire 1.

[0037] (2) Mode 3: When the tire pressure is higher than P2, the friction will be reduced, resulting in a longer braking distance. The bounce of tire 1 will be increased, causing the vibration of the vehicle to intensify while driving, affecting the ride comfort. Abnormal tire pressure will increase the energy consumption of the vehicle body, increase the wear of tire 1, and may be accompanied by a tire blowout.

[0038] When the system determines that it is mode 2 and the tire pressure does not continue to decrease, the air pump 6 acts as an actuator to compress the external air source, and inputs the compressed gas into the pipeline to control the required gas pressure and flow through the electromagnetic regulating valve 9. The safety valve 25 is used for possible emergencies that may cause abnormal air pressure.

[0039] When the system determines that it is mode 2 and the tire pressure drops sharply, the air pump 6, as an actuator, connects the input end to the tire sealant tank 8 to extract tire sealant from the tire sealant tank 8, connects the output end to the pipeline to input the tire sealant into the pipeline, and controls the hydraulic pressure and tire sealant flow in the pipeline by adjusting the opening of the electromagnetic regulating valve 9 to ensure that the tire sealant can fully exert its chemical effect in the tire 1.

[0040] When the system determines that it is mode three, when the air pressure is higher than the adjustment value set by the safety valve 25, the pipeline air pressure is unloaded to ensure that the air pressure in the pipeline is within the normal range.

[0041] Here, a parallel indirect verification action will be performed based on the tire 1 rotation speed information obtained from the public CAN of the whole vehicle, and the judgment result in the real-time pressure maintaining device will be checked to detect whether the tire pressure is stable.

[0042] The present invention can monitor the tire pressure in real time through the tire pressure sensor 5, and realize dynamic inflation through the air pump machine 6, so as to ensure that the tire 1 always maintains the appropriate tire pressure, which helps to improve the driving safety, fuel economy or cruising range of the vehicle. The present invention can accurately control the flow of gas or tire repair fluid through the setting of the electromagnetic regulating valve 9, ensure the flow is adjusted during the process of inflation, deflation or filling of tire repair fluid, and improve the working efficiency and accuracy of the pressure maintaining device. The present invention makes full use of the space around the wheel hub motor by setting the air pump machine 6 below the rotating end of the wheel hub motor and realizing electrical connection through the conductive slip ring 7, and does not need to open up a large installation space for the pressure maintaining device separately, which helps to improve the space utilization of the vehicle and will not have a significant impact on the overall layout of the vehicle. In addition, the present invention can prevent structural damage, explosion and leakage through the setting of the safety valve 25 to ensure safe operation.

[0043] In summary, the present invention can achieve real-time tire pressure maintenance and improve the service life and reliability of the tire.

Claims

1. A real-time pressure-maintaining device for a tire of a new energy vehicle, comprising a hub motor arranged in a wheel hub (2), a tire pressure sensor (5) arranged on the inner side of a tire (1), and a valve (3) arranged on the inner side of the tire (1); a rotating shaft (4) is arranged in the wheel hub (2), and the rotating shaft (4) is connected to the rotating end of the hub motor; the characteristics are: An air pump (6) is arranged on the side wall of the rotating shaft (4), and an output end of the air pump (6) is connected to an electromagnetic regulating valve (9), and the electromagnetic regulating valve (9) is connected to the air valve (3) of the tire (1) through a pipeline; a conductive slip ring (7) is arranged at one end of the rotating shaft (4), and the conductive slip ring (7) comprises a rotor (11) arranged inside the rotating shaft (4), one end of the rotor (11) is electrically connected to the air pump (6), and the other end of the rotor (11) is sleeved with a rotor bearing (12), and the outer end of the rotor bearing (12) is provided with a stator end cover (13), and the other end of the stator end cover (13) is provided with a stator (14), and the stator (14) is provided with a stator interface connected to a vehicle body power supply and a signal end.

2. The real-time pressure maintaining device for new energy vehicle tires according to claim 1, characterized in that: A connecting seat (10) is provided on the side wall of the rotating shaft (4), and a plurality of hole groups are provided on the connecting seat (10). The connecting seat (10) is screw-connected to the air pump (6) via the hole groups.

3. The real-time pressure maintaining device for new energy vehicle tires according to claim 1, characterized in that: The electromagnetic regulating valve (9) comprises an electromagnetic valve seat (15), and the two ends of the electromagnetic valve seat (15) are respectively provided with a first pipeline connection end cover (16) and a second pipeline connection end cover (17), and the air pump (6) is connected to one end of the electromagnetic valve seat (15) via the first pipeline connection end cover (16); a valve port (18) is provided in the electromagnetic valve seat (15), and a slideway (19) is provided at the side end of the electromagnetic valve seat (15), and a wire is provided in the slideway (19). A power supply end (21) electrically connected to the coil (20) is provided on the side of the slideway (19); a fixed iron core (22) is fixed to one end of the slideway (19); a first spring (23) is connected to the fixed iron core (22); one end of the first spring (23) is connected to a moving iron core valve core (24) inserted into the coil (20); the moving iron core valve core (24) is driven by the energized coil (20) to cooperate with the valve port (18) along the slideway (19).

4. The real-time pressure maintaining device for new energy vehicle tires according to claim 3 is characterized in that: A safety valve (25) and a valve port interface (26) are sequentially connected between the electromagnetic regulating valve (9) and the valve nozzle (3).

5. The real-time pressure maintaining device for new energy vehicle tires according to claim 4 is characterized in that: The safety valve (25) comprises a third pipe connection end cover (27) connected to the pipe, the third pipe connection end cover (27) is connected to an inner cavity (28), a second spring (29) is fixed at one end of the inner cavity (28), a valve stem (30) with one end fixed in the inner cavity (28) is arranged in the second spring (29); a safety valve seat (31) is arranged at the bottom of the inner cavity (28), an air hole (32) is arranged in the safety valve seat (31), and a valve flap (33) cooperating with the valve stem (30) is arranged at the upper end of the air hole (32).

6. The real-time pressure maintaining device for new energy vehicle tires according to claim 1, characterized in that: One end of the air pump machine (6) is provided with a tire repair liquid tank (8).

7. The control method of the real-time pressure maintaining device of the new energy vehicle tire according to any one of claims 1 to 6, characterized in that: The tire pressure sensor (5) is responsible for transmitting real-time tire pressure information, and the air pump (6) controls the gas flow rate through the electromagnetic regulating valve (9); when the tire pressure sensor (5) detects that the tire pressure of the tire (1) becomes high, the air pump (6) is used to deflate; when the tire pressure sensor (5) detects that the tire pressure is slightly reduced, the air pump (6) is started to achieve dynamic inflation.

8. The control method of the real-time pressure maintaining device of the new energy vehicle tire according to claim 7 is characterized in that: When the tire pressure sensor (5) detects that the tire pressure drops sharply, the air pump (6) draws tire repair fluid from the tire repair fluid tank (8) and fills the tire (1).

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