CN113108980B - Tire cooling device and method for keeping dynamic balance of tire pressure - Google Patents
Tire cooling device and method for keeping dynamic balance of tire pressure Download PDFInfo
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- CN113108980B CN113108980B CN202110507415.8A CN202110507415A CN113108980B CN 113108980 B CN113108980 B CN 113108980B CN 202110507415 A CN202110507415 A CN 202110507415A CN 113108980 B CN113108980 B CN 113108980B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L17/00—Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/18—Tyre cooling arrangements, e.g. heat shields
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/01—Control of temperature without auxiliary power
- G05D23/13—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures
- G05D23/1393—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures characterised by the use of electric means
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Abstract
The invention provides a tire cooling device and a method for keeping dynamic balance of tire pressure, which can be used for reducing the temperature of a tire and comprises an inflator pump, a gas transmission steel pipe, a spherical rotary ventilation shaft, a hub support, an inflation nozzle, a tire air release control valve and an inflator pump electrification valve. The tire deflation control valve is internally provided with a temperature sensor module and a Bluetooth module, when the temperature sensor monitors that the temperature of air in the tire exceeds a set threshold value, the Bluetooth module sends information for starting an automobile air conditioning system and an inflator pump to an automobile ECU and an inflator pump electrifying valve, and the inflator pump conveys low-temperature air around an air conditioning evaporator into the tire. Meanwhile, the tire deflation control valve is opened to release the high-temperature air in the tire. The rotating speed of the motor of the inflator pump is selected to be in a certain proportion with the sectional area of the air outlet of the tire air release control valve, so that the air quantity of low-temperature air entering the tire is the same as that of high-temperature air released from the tire, and the purpose of cooling the tire is achieved on the premise of keeping dynamic balance of tire pressure.
Description
Technical Field
The invention relates to a cooling device for an automobile tire, in particular to a cooling device for a tire and a method thereof, which are used for controlling the temperature variable of gas in the tire and keeping the dynamic balance of the tire pressure during a tire pressure monitoring test.
Background
Tire pressure monitoring sensors are generally required to be installed in production passenger vehicles, and research and development efforts on tire pressure monitoring systems are continuously increased for various large vehicle enterprises and automobile spare and accessory manufacturers. Due to the advantage of low cost, the research and development of the indirect tire pressure monitoring system based on the tire rolling radius and the spectrum method are favored by various large vehicle enterprises and automobile accessory manufacturers. In the process of developing an indirect tire pressure monitoring system, it is found that: the actual tire pressure of the tire measured by the tire pressure sensor may be affected by the temperature of the gas in the tire. In hot summer, when the test vehicle runs on the road for a period of time at a high speed, the temperature of gas in the tire can be obviously increased, and further, the tire pressure of the tire measured by the tire pressure sensor is also obviously increased. When data of a fixed tire pressure, for example, data of a tire when the tire pressure is 2.3bar, needs to be adjusted to 2.25bar according to experience before a vehicle is started, and the vehicle is driven for a period of time to perform "hot tire", and when the temperature in the tire is relatively stable, the data of the tire is collected. After the test vehicle runs for too long time, the test vehicle often needs to be stopped for a period of time, so that the temperature and the air pressure in the tire are reduced to stable values and then the test vehicle continues to run, obviously, the test time is greatly consumed, the working strength of a tester is increased, and the tire pressure preset according to experience is inaccurate after the tire is heated and has great randomness.
The invention is provided for keeping the temperature of the gas in the tire within a certain threshold value and eliminating the influence of the excessive temperature rise of the tire pressure of the tire during the tire pressure monitoring test.
Disclosure of Invention
Different from other tire cooling modes of water spraying cooling and heat conduction cooling on the surface of the tire, the method of directly filling low-temperature air into the tire by the inflator pump ensures that the temperature of the gas in the tire can be kept within a certain threshold value even after the tire runs for a period of time in high-temperature weather, and eliminates the interference of the continuous rise of the temperature of the gas in the tire on the tire pressure monitoring test process during the tire pressure monitoring test.
In order to solve the technical problems, the invention provides the following technical scheme: a tire cooling device for keeping dynamic balance of tire pressure comprises a cold air collecting wide mouth mask, an air conveying hose, an inflator pump, three bent air conveying steel pipes, a spherical rotary ventilation shaft, one bent air conveying steel pipe, a hub support, an inflator nozzle, a tire discharge control valve and an inflator pump energizing valve, wherein the cold air collecting wide mouth mask is fixed on the right side of an air conditioner evaporator, an air inlet of the cold air collecting wide mouth mask faces the air conditioner evaporator, an air outlet of the cold air collecting wide mouth mask is communicated with an air inlet end of the inflator pump through the air conveying hose, the inflator pump is connected with the inflator pump energizing valve through an electric wire, and the inflator pump energizing valve is connected with a vehicle-mounted power supply through an electric wire; the inflator pump is fixed on the automobile trunk, the air outlet end of the inflator pump is communicated with the air inlet end of the three-bent air delivery steel pipe through the air delivery hose, the three-bent air delivery steel pipe is fixed on the automobile inner wheel cover, the air outlet end of the three-bent air delivery steel pipe is communicated with the air inlet end of the spherical rotary ventilation shaft, and the air outlet end of the spherical rotary ventilation shaft is communicated with the air inlet end of the bent air delivery steel pipe; the spherical rotary ventilation shaft comprises a spherical shell, a sphere and a sealing gasket; a through air hole is arranged at the center of the sphere, and a sealing gasket is arranged between the spherical shell and the sphere; the central axis of the hub support, the central axis of the air inlet end of the bent air transmission steel pipe, the central axis of the spherical rotary ventilation shaft and the central axis of the tire are superposed, and the air outlet end of the bent air transmission steel pipe is communicated with the air inlet end of the inflation nozzle through an air transmission hose; the tire deflation control valve comprises a control valve shell, a spring, a push rod, a piston cavity, an electromagnetic coil, a permanent magnet, a battery, a sealing ring and a control valve circuit system, wherein a shell pressure relief opening is formed in the side wall of the control valve shell, a control valve air outlet and a control valve air inlet are respectively formed in two end faces of the control valve shell, the piston and the push rod are arranged in the piston cavity, two ends of the push rod are respectively connected with the electromagnetic coil and the spring, the spring is fixed on the inner wall of the right side of the control valve shell, the permanent magnet is fixed on the inner wall of the left side of the control valve shell, the battery is arranged between the piston cavity and the inner wall of the lower side of the control valve shell, and the electromagnetic coil and the control valve circuit system are powered; the control valve circuit system is fixed on a control valve air inlet, a power module, a control module, a temperature sensor module, a Bluetooth module and a relay module are arranged in the control valve circuit system, the temperature sensor module arranged on the control valve circuit system is used for monitoring the temperature of air in a tire, the Bluetooth module is used for transmitting information to an automobile ECU and an inflation pump power-on valve, the relay module is used for controlling the power-on and power-off of an electromagnetic coil, the control module is used for judging the temperature, controlling the Bluetooth module to send information and controlling the power-on and power-off of the relay module, and the power module supplies power to other modules; the device utilizes the pump to carry the low temperature air of vehicle air conditioner evaporimeter department to in the tire, utilizes tire bleed air control valve to let out the high temperature air of equivalent volume from the tire simultaneously to guarantee tire pressure dynamic balance and reduce the interior air temperature of tire.
Preferably, the spherical shell comprises an air inlet hemispherical shell and an air outlet hemispherical shell, the air inlet hemispherical shell and the air outlet hemispherical shell can rotate relatively, and four sealing gaskets are arranged in the spherical rotary ventilation shaft to prevent air from entering a gap between the spherical rotary ventilation shaft shell and the sphere, so that the air can only flow through the air holes of the sphere.
Preferably, the air outlet hemisphere shell, the bent air transmission steel pipe and the hub support of the spherical rotary ventilation shaft can synchronously rotate along with the rotation of the tire; the air outlet of the control valve is used as the air outlet of the piston cavity, the air inlet of the control valve is used as the air inlet of the piston cavity, the piston can move left and right in the piston cavity, the air inlet of the control valve is inserted into and fixed on the tire, and the sealing ring is arranged between the air inlet of the control valve and the tire to play a role in fixing and sealing.
Preferably, the air outlet end of the inflation nozzle is clamped on a tire valve, the inflation nozzle is a one-way circulation inflation nozzle, air can only circulate from the air inlet end of the inflation nozzle to the air outlet end of the inflation nozzle, and the tire deflation control valve needs to be inserted into a tire by punching a hole from a rim.
Preferably, the rotation speed of the motor of the inflator pump and the sectional area of the air outlet of the control valve meet a certain proportional relationship, the power-on opening time of the inflator pump is controlled through the power-on valve of the inflator pump, and meanwhile, the control valve circuit system controls the opening and closing of the air outlet of the control valve, so that the air inflow and the air leakage in the tire are the same.
Preferably, when the temperature of the air in the tire measured by the temperature sensor module is greater than a set threshold value of the temperature of the air in the tire, the Bluetooth module sends information for starting the air conditioning system and the inflator pump to the automobile ECU and the inflator pump energizing valve; when the temperature of the air in the tire measured by the temperature sensor module is less than or equal to the set threshold value of the temperature of the air in the tire, the Bluetooth module sends information for closing the air conditioning system and the inflating pump to the automobile ECU and the inflating pump electrifying valve.
Preferably, the tire internal air temperature threshold is set to 20 ℃.
Preferably, the rotating speed r of the inflator and the sectional area A of the air outlet of the control valve satisfy the following proportional relationship:
A/r＝k；
k is a scaling factor, and k can be expressed as:
k＝(C×ρin)/(v×ρout)；
in the formula: c is the cylinder volume of the inflator pump, rhoinDensity of atmosphere, v mean flow velocity of gas discharged, poutIs the density of the gas within the tire.
The second aspect of the invention provides a use method of the tire cooling device for keeping dynamic balance of tire pressure based on the above, which comprises the following steps:
s1, setting a temperature threshold value through a control valve circuit system, when the temperature of gas in a tire is higher than the set temperature threshold value, controlling a Bluetooth module to respectively send information for controlling the opening of an automobile air-conditioning system and controlling the opening of an inflator pump to an automobile ECU and an inflator pump electrifying valve by a control module, starting the automobile air-conditioning refrigeration system by the automobile ECU, and opening the inflator pump by the inflator pump electrifying valve;
s2, sucking low-temperature air around the air conditioner evaporator through a cold air collecting wide mouth mask and an air delivery hose by an inflator pump, and delivering the sucked low-temperature air into the tire through the air delivery hose, a three-bent air delivery steel pipe, a spherical rotary ventilation shaft, a bent air delivery steel pipe, the air delivery hose and an inflation nozzle in sequence;
s3, when the Bluetooth module on the control valve circuit system sends information to the automobile ECU, the control module controls the relay module to close, the electromagnetic coil is electrified to generate a magnetic field, the electromagnetic coil moves leftwards under the attraction effect of the magnetic force of the permanent magnet, the electromagnetic coil drives the piston to move leftwards by the push rod, the port of the control valve air inlet to the piston cavity is opened, and high-temperature gas in the tire is discharged through the control valve air inlet, the piston cavity and the control valve air outlet;
s4, injecting low-temperature air into the tire, discharging high-temperature air from the tire, and reducing the temperature of air in the tire through the replacement of the low-temperature air and the high-temperature air in the tire;
s5, selecting the motor speed when the inflation pump works and the sectional area of the air outlet of the control valve to meet a certain proportional relation, so that the air quantity of low-temperature air entering the tire is the same as that of high-temperature air leaked from the tire, and the tire pressure of the tire is kept in dynamic balance;
s6, when the temperature sensor module in the control valve circuit system monitors that the temperature of the gas in the tire is lower than a set threshold value, the Bluetooth module in the control valve circuit system sends the information of closing the automobile air conditioning system and the inflator pump to the automobile ECU and the inflator pump electrifying valve respectively, the automobile ECU controls the vehicle-mounted air conditioning system to be closed, and the inflator pump electrifying valve controls the inflator pump to be closed;
s7, when the Bluetooth module on the control valve circuit system sends information to the automobile ECU, the control module controls the relay module to be disconnected, the electromagnetic coil is powered off, the magnetic field disappears, the elastic restoring force of the spring pulls the push rod, the piston and the electromagnetic coil move rightwards, the port of the air inlet of the control valve, which leads to the piston cavity, is closed, and air in the tire is not leaked out;
and S8, repeating the air inflation and deflation steps when the temperature of the air in the tire rises again and reaches the set temperature threshold, so that the aim of cooling the tire is achieved on the premise of maintaining the dynamic balance of the tire pressure by replacing the low-temperature air and the high-temperature air in the tire in equal quantity.
By adopting the technical scheme, the following beneficial effects can be achieved:
(1) in the invention, based on the practical requirement of controlling the influence factors of the temperature change of the gas in the tire during the tire pressure monitoring test, the low-temperature air around the automobile air-conditioning evaporator is collected, the power of the inflator pump is utilized to convey the low-temperature air into the tire through the tire valve, the tire deflation control valve is opened at the same time, the rotating speed of the motor of the inflator pump and the sectional area of the air outlet of the control valve are selected to meet a certain proportional relation, so that the gas filling amount and the gas deflation amount in the tire are the same, and the high-temperature air in the tire is replaced by the low-temperature air on the premise of ensuring the dynamic balance of the tire pressure in the tire, thereby achieving the purpose of cooling the tire;
(2) the air inlet end and the air outlet end of the spherical rotary ventilation shaft designed by the invention can rotate relatively, so that low-temperature air can be smoothly introduced into the tire even if the tire rotates at a high speed;
(3) the invention uses the low-temperature air around the air-conditioning radiator of the automobile as a cooling source, does not need an external cooling source device and has low cost.
Drawings
FIG. 1 is a block diagram of the apparatus of the present invention;
FIG. 2 is a view illustrating the structure of a ball-type rotary ventilation shaft according to the present invention;
FIG. 3 is a structural view of a tire air release control valve of the present invention;
FIG. 4 is a system control strategy diagram of the present invention;
FIG. 5 is a diagram of a simulation model for maintaining tire pressure dynamic balance according to the present invention;
FIG. 6 is a diagram of simulation results for maintaining tire pressure dynamic balance according to the present invention;
FIG. 7 is a schematic diagram of the control valve circuitry of the present invention;
FIG. 8 is a schematic diagram of the circuitry within the inflator switch of the present invention.
Reference numerals:
1. automotive air conditioning evaporators; 2. a cold air collecting wide mouth mask; 3. a first gas hose; 4. an inflator pump; 5. a second gas hose; 6. an automobile inner wheel cover; 7. a three-bend gas transmission steel pipe; 8. a spherical rotary ventilation shaft; 9. a bent gas transmission steel pipe; 10. a hub support; 11. a third gas hose; 12. an air charging nozzle; 13. tire relief control valve, 14, tire; 15. an electric valve 16 of the inflator pump and an air inlet hemisphere shell; 17. a sphere; 18. an air outlet hemisphere shell; 19. a gasket; 20. a control valve housing; 21. a housing pressure relief port; 22. a control valve outlet; 23. a spring; 24. a push rod; 25. a piston; 26. a piston cavity; 27. an electromagnetic coil; 28. a permanent magnet; 29. a battery; 30. a seal ring; 31. a control valve air inlet; 32. control valve circuitry.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments that can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
As shown in fig. 1, the whole structure of the present invention is shown, which comprises a cold air collecting wide mouth mask 2, a first air delivery hose 3, an inflator 4, a second air delivery hose 5, a three-bend air delivery steel pipe 7, a ball-shaped rotary ventilation shaft 8, a bend air delivery steel pipe 9, a hub support 10, a third air delivery hose 11, an inflator 12, a tire deflation control valve 13 and an inflator switch 15. The vehicle air conditioner evaporator 1, the vehicle inner wheel cover 6 and the tire 14 are of a typical vehicle standard configuration and are not included in the present invention, and are specifically identified in the drawings for the sake of completeness. Wherein, wide gauze mask 2 is collected to the air conditioning, and the air inlet that wide gauze mask 2 was collected to the air conditioning is big, towards air conditioning 1. The air outlet of the cold air collecting wide-mouth mask 2 is small and is communicated with the air inlet end of the inflator pump 4 through a first air hose 3.
The inflator pump 4 is fixed on the automobile trunk, and the air outlet end of the inflator pump is communicated with the air inlet end of the three-bent air conveying steel pipe 7 through the second air conveying hose 5. The inflator pump 4 is connected with the inflator pump electrifying valve 15 through an electric wire, and the inflator pump electrifying valve 15 is connected with the vehicle-mounted power supply through an electric wire. The three-bent gas transmission steel pipe 7 is fixed on the automobile inner wheel cover 6, and the gas outlet end of the three-bent gas transmission steel pipe 7 is communicated with the gas inlet end of the spherical rotary ventilation shaft 8.
The structure of the ball-type rotary ventilation shaft 8 is shown in fig. 2, and the ball-type rotary ventilation shaft 8 comprises an air inlet hemisphere housing 16, a ball 17, an air outlet hemisphere housing 18 and a sealing gasket 19. The air inlet hemisphere shell 16 and the air outlet hemisphere shell 18 are in non-fixed connection and can rotate relatively, and the air inlet hemisphere shell 16 and the air outlet hemisphere shell 18 form the whole shell of the spherical rotary ventilation shaft; the sphere 17 is provided with an air hole passing through the sphere center and penetrating through the sphere, and air can circulate through the air hole; the sealing gasket 19 is arranged between the spherical rotary ventilation shaft shell and the sphere 17 and is used for preventing gas from entering a gap between the spherical rotary ventilation shaft shell and the sphere 17, so that the gas can only flow through the air hole of the sphere 17; the air outlet end of the spherical rotary ventilation shaft is communicated with the air inlet end of a bent gas transmission steel pipe 9.
A bent gas transmission steel pipe 9 is fixed on a hub of a tire 14 through a hub support 10, the central axis of the hub support 10 and the central axis of the gas inlet end of the bent gas transmission steel pipe are on the same straight line, and the central axis of the spherical rotary ventilation shaft 8 and the central axis of the tire 14 are on the same straight line, so that the gas outlet hemispherical shell 18 of the spherical rotary ventilation shaft 8, the bent gas transmission steel pipe 9 and the hub support 10 can synchronously rotate along with the rotation of the tire 14; the air outlet end of a bent air-conveying steel pipe is communicated with the air inlet end of an inflating nozzle 12 through a third air-conveying hose 11.
The air outlet end of the charging connector 12 is clamped on the tire valve, the charging connector 12 is a one-way circulating charging connector, and air can only circulate from the air inlet end of the charging connector to the air outlet end of the charging connector.
The tire deflation control valve 13 needs to be inserted into the tire 14 through a hole punched on the rim, and the structure of the tire deflation control valve is shown in fig. 3 and comprises a control valve shell 20, a spring 23, a push rod 24, a piston 25, a piston cavity 26, an electromagnetic coil 27, a permanent magnet 28, a battery 29, a sealing ring 30 and a control valve circuit system 32; the control valve shell 20 plays a role in protecting and fixing components, and a shell pressure relief opening 21 is formed in the control valve shell 20, so that air between the control valve shell 20 and the piston cavity 26 can freely enter and exit, and the resistance generated by compressed air during piston movement is reduced; the upper end face of the control valve shell 20 is provided with a control valve air outlet 22, the lower end face is provided with a control valve air inlet 31, the control valve air outlet 22 is also an air outlet of the piston cavity 26, and the control valve air inlet 31 is also an air inlet of the piston cavity 26; a piston 25 and a push rod 24 are arranged in a piston cavity 26, the left side of the push rod is connected with an electromagnetic coil 27, the right side of the push rod is connected with a spring 23, and the spring 23 is fixed on the inner wall of the right side of the control valve shell 20; the piston 25 can move left and right in the piston cavity 26; a permanent magnet 28 is fixed to the left inner wall of the control valve housing 20, and a battery 29 is interposed between the piston chamber 26 and the lower inner wall of the control valve housing 20 to supply power to the electromagnetic coil 27 and the control valve circuitry 32; the control valve inlet 31 is inserted into the tire and fixed, and the seal ring 30 is interposed between the control valve inlet 31 and the tire 14 to perform fixing and sealing functions.
The control valve circuit system 32 is fixed on the control valve air inlet 31, the control valve circuit system 32 is a miniature circuit board, and a power supply module, a control module, a temperature sensor module, a Bluetooth module and a relay module are arranged on the circuit board; the temperature sensor module arranged on the control valve circuit system 32 is used for monitoring the gas temperature in the tire, the Bluetooth module is used for transmitting information to the automobile ECU and the inflator pump electrifying valve 15, the relay module is used for controlling the electrification and the disconnection of the electromagnetic coil 27, and the control module is used for temperature judgment and controlling the Bluetooth module and the relay module.
The operation of the present invention will be described below with reference to the apparatus structure diagram of the present invention:
s1, setting temperature threshold information is contained in a control module of the control valve circuit system 32, when a temperature sensor module in the control valve circuit system 32 monitors that the temperature of gas in a tire is larger than the setting temperature threshold, the control module controls a Bluetooth module to respectively send information for controlling the opening of an automobile air conditioning system and the opening of an inflator pump to an automobile ECU and an inflator pump electrifying valve 15, the automobile ECU opens the automobile air conditioning refrigeration system, and the inflator pump electrifying valve 15 opens the inflator pump 4;
s2, sucking low-temperature air around the air-conditioning evaporator 1 through the cold air collecting wide mouth mask 2 and the first air conveying hose 3 by the inflator pump 4, and conveying the sucked low-temperature air into a tire 14 through the second air conveying hose 5, the three-bent air conveying steel pipe 7, the spherical rotary ventilation shaft 8, the one-bent air conveying steel pipe 9, the third air conveying hose 11 and the inflating nozzle 12 in sequence;
s3, when the Bluetooth module on the control valve circuit system 32 sends information to the automobile ECU and the inflator pump electrifying valve 15, the control module controls the relay module to be closed, the electromagnetic coil 27 is electrified to generate a magnetic field, the electromagnetic coil 27 moves leftwards under the attraction of the magnetic force of the permanent magnet 28, the electromagnetic coil 27 drives the piston 25 to move leftwards by the push rod 24, the port of the control valve air inlet 31 leading to the piston cavity 26 is opened, and high-temperature gas in the tire 14 is discharged through the control valve air inlet 31, the piston cavity 26 and the control valve air outlet 22;
s4, injecting low-temperature air into the tire 14, discharging high-temperature air from the tire 14, and achieving the purpose of reducing the temperature of the air in the tire through the replacement of the low-temperature air and the high-temperature air in the tire 14;
s5, selecting the rotation speed of the motor of the inflator 4 and the sectional area of the air outlet 22 of the control valve to form a certain proportional relationship, so that the air quantity of the low-temperature air entering the tire and the air quantity of the high-temperature air leaking from the tire are the same, and finally the tire pressure of the tire is maintained in a dynamic balance state.
S6, when the temperature sensor module in the control valve circuit system 32 monitors that the temperature of the gas in the tire is lower than or equal to a set threshold value, the Bluetooth module in the control valve circuit system 32 sends the information of closing the automobile air conditioning system and the inflator pump 4 to the automobile ECU and the inflator pump electrifying valve 15 respectively, the automobile ECU controls the vehicle-mounted air conditioning system to be closed, and the inflator pump electrifying valve 15 controls the inflator pump 4 to be closed;
s7, when the Bluetooth module on the control valve circuit system 32 sends information to the automobile ECU, the control module controls the relay module to be switched off, the electromagnetic coil 27 is powered off, the magnetic field disappears, the elastic restoring force of the spring 23 pulls the push rod 24, the piston 25 and the electromagnetic coil 27 move rightwards, the port of the control valve air inlet 31 leading to the piston cavity 26 is closed, and air in the tire 14 is not leaked out any more;
and S8, repeating the air charging and discharging steps when the temperature of the air in the tire rises again and reaches a set temperature threshold value, so that the purpose of cooling the tire is achieved on the premise of maintaining the dynamic balance of the tire pressure through the equivalent replacement of low-temperature air and high-temperature air in the tire, and the interference of continuous rising factors of the temperature in the tire is eliminated when a tire pressure monitoring test is carried out.
The feasibility of dynamic tire pressure balance achieved by selecting a certain proportional relationship between the rotation speed of the motor of the inflator pump and the air outlet of the control valve is described below with reference to the system control strategy diagram 4:
the amount of low-temperature air delivered into the tire by the inflator pump and the amount of high-temperature air leaked out of the tire take the quality of the air as a measurement standard;
mass m of gas released from the tireout＝Q×tout×ρout；
In the formula: q is the gas volume flow, toutTime of opening of control valve for tyre deflation, rhooutIs the gas density within the tire;
the gas volume flow Q ═ v × a;
in the formula: v is the average flow velocity of the discharged gas and A is the sectional area of the channel;
thus, there is mout＝v×A×tout×ρout；
Mass m of air flushed into tire by inflator pumpin＝C×r×tin×ρin；
In the formula: c is the cylinder volume of the inflator pump, r is the rotation speed of the motor of the inflator pump, tinTime, rho for inflating inflatorinDensity of the atmosphere;
controlling the mass of gas entering and exiting the tyre to be the same, i.e. min＝mout；
Namely: v × A × tout×ρout＝C×r×tin×ρin；
In the formula: the average flow velocity v of the discharged gas is determined by the pressure difference between the gas in the tire and the atmosphere, and the pressure difference change is very small in the short time of tire deflation, so that the average flow velocity v of the discharged gas is a fixed value;
when the tire deflation control valve is opened, the Bluetooth module sends start charging to the automobile ECUThe control information of the air pump controls the air pump to be started in time, the time delay of information transmission is millisecond grade and can be ignored, so the opening time t of the tire deflation control valveoutIs equal to the inflation time t of the inflatorin；
Gas density in a tire ρoutThe volume of the gas in the tyre is basically kept constant during the operation of the device, the temperature floats in a small range above and below a set temperature threshold value, and the density rho of the gas in the tyre is determinedoutHas little influence on the gas density rho in the tyre during operation of the deviceoutIs a fixed value;
the volume C of the cylinder of the air charging pump is determined during production and manufacturing and is a fixed value;
ρinthe atmospheric density is also a fixed value in the same area of the altitude;
therefore, A/r ═ C × ρin)/(v×ρout)；
The right sides of the equations are fixed values, which are marked as k;
therefore, there are a/r ═ k;
when the sectional area of the air discharge opening of the air discharge control valve and the rotating speed of the motor of the inflator pump meet a certain proportional relation, m can be realizedin＝moutNamely, the gas discharged from the tire is the same as the gas which is flushed into the tire by the inflator, so that the tire pressure in the tire is maintained in a dynamic balance state.
In order to prove the feasibility of maintaining the dynamic balance of the tire pressure, a Matlab/Simulink model is constructed by utilizing the derivation process and is simulated, and the model is shown in FIG. 5.
As a result of the simulation, as shown in fig. 6, the abscissa represents the simulated inflation time, and the ordinate represents the difference between the amount of air introduced into the tire and the amount of air discharged from the tire.
As shown in fig. 7, the present invention provides a circuit schematic of the control valve circuitry 32, including a power module, a control module, a temperature sensor module, a bluetooth module, and a relay module.
As shown in fig. 8, the present invention provides a schematic circuit diagram of the inflator pump energizing valve 15, which includes a power module, a control module, a bluetooth module, and a relay module.
The principle and the implementation mode of the invention are explained by applying the specific embodiments, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In summary, this summary should not be construed to limit the present invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. As a result of the observation: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Claims (9)
1. A tire cooling device for keeping dynamic balance of tire pressure comprises a cold air collecting wide mouth mask, an air delivery hose, an inflator pump, three bent air delivery steel tubes, a spherical rotary ventilation shaft, one bent air delivery steel tube, a hub support, an inflation nozzle, a tire air release control valve and an inflator pump power-on valve,
the cold air collecting wide-mouth mask is fixed on the right side of the air conditioner evaporator, an air inlet of the cold air collecting wide-mouth mask faces the air conditioner evaporator, an air outlet of the cold air collecting wide-mouth mask is communicated with an air inlet end of an inflator pump through an air conveying hose, the inflator pump is connected with an electric conduction valve of the inflator pump through an electric wire, and the electric conduction valve of the inflator pump is connected with a vehicle-mounted power supply through an electric wire;
the inflator pump is fixed on the automobile trunk, the air outlet end of the inflator pump is communicated with the air inlet end of the three-bent air delivery steel pipe through the air delivery hose, the three-bent air delivery steel pipe is fixed on the automobile inner wheel cover, the air outlet end of the three-bent air delivery steel pipe is communicated with the air inlet end of the spherical rotary ventilation shaft, and the air outlet end of the spherical rotary ventilation shaft is communicated with the air inlet end of the bent air delivery steel pipe;
the spherical rotary ventilation shaft comprises a spherical shell, a sphere and a sealing gasket; a through air hole is arranged at the center of the sphere, and a sealing gasket is arranged between the spherical shell and the sphere;
the central axis of the hub support, the central axis of the air inlet end of the bent air transmission steel pipe, the central axis of the spherical rotary ventilation shaft and the central axis of the tire are superposed, and the air outlet end of the bent air transmission steel pipe is communicated with the air inlet end of the inflation nozzle through an air transmission hose;
the tire deflation control valve comprises a control valve shell, a spring, a push rod, a piston cavity, an electromagnetic coil, a permanent magnet, a battery, a sealing ring and a control valve circuit system, wherein a shell pressure relief opening is formed in the side wall of the control valve shell, a control valve air outlet and a control valve air inlet are respectively formed in two end faces of the control valve shell, the piston and the push rod are arranged in the piston cavity, two ends of the push rod are respectively connected with the electromagnetic coil and the spring, the spring is fixed on the inner wall of the right side of the control valve shell, the permanent magnet is fixed on the inner wall of the left side of the control valve shell, the battery is arranged between the piston cavity and the inner wall of the lower side of the control valve shell, and the electromagnetic coil and the control valve circuit system are powered;
the control valve circuit system is fixed on the control valve air inlet, a power module, a control module, a temperature sensor module, a Bluetooth module and a relay module are arranged in the control valve circuit system, the temperature sensor module arranged on the control valve circuit system is used for monitoring the air temperature in a tire, the Bluetooth module is used for transmitting information to an automobile ECU and an inflation pump electrifying valve, the relay module is used for controlling the electrification and the disconnection of an electromagnetic coil, the control module is used for judging the temperature, controlling the Bluetooth module to send information and controlling the on and the off of the relay module, and the power module supplies power to the control module, the temperature sensor module, the Bluetooth module and the relay module;
the low-temperature air at the evaporator of the automobile air conditioner is conveyed into the tire by the inflator pump, and the same amount of high-temperature air is discharged from the tire by the tire discharge control valve, so that the dynamic balance of the tire pressure of the tire is ensured and the air temperature in the tire is reduced.
2. The tire cooling device for maintaining dynamic balance of tire pressure according to claim 1, wherein the spherical housing comprises an air inlet hemisphere housing and an air outlet hemisphere housing, the air inlet hemisphere housing and the air outlet hemisphere housing can rotate relatively, and four sealing gaskets are disposed in the spherical rotary ventilation shaft to prevent air from entering into the gap between the spherical rotary ventilation shaft housing and the ball body, so that air can only flow through the air holes of the ball body.
3. The tire cooling device for maintaining dynamic balance of tire pressure as claimed in claim 1, wherein the air outlet hemisphere shell, a bent air transmission steel tube and the hub support of the spherical rotary ventilation shaft can synchronously rotate with the rotation of the tire; the air outlet of the control valve is used as the air outlet of the piston cavity, the air inlet of the control valve is used as the air inlet of the piston cavity, the piston can move left and right in the piston cavity, the air inlet of the control valve is inserted into and fixed on the tire, and the sealing ring is arranged between the air inlet of the control valve and the tire to play a role in fixing and sealing.
4. The tire cooling device for maintaining dynamic tire pressure balance according to claim 1, wherein the air outlet end of the inflation nozzle is clamped on the tire valve, the inflation nozzle is a one-way ventilation inflation nozzle, air can only circulate from the air inlet end of the inflation nozzle to the air outlet end of the inflation nozzle, and the tire deflation control valve needs to be inserted into the tire by punching from the rim.
5. The tire cooling device for maintaining dynamic tire pressure balance as claimed in claim 1, wherein the rotation speed of the motor of the inflator and the cross-sectional area of the air outlet of the control valve satisfy a certain proportional relationship, the time for the inflator to be turned on is controlled by the power-on valve of the inflator, and the control valve circuit system controls the opening and closing of the air outlet of the control valve, so that the air input and the air discharge amount in the tire are the same.
6. The tire cooling device for maintaining dynamic balance of tire pressure according to claim 1, wherein when the temperature in the tire measured by the temperature sensor module is higher than the set threshold value of the temperature in the tire, the bluetooth module sends information for turning on the air conditioning system and the inflator pump to the vehicle ECU and the inflator pump energizing valve; when the temperature of the air in the tire measured by the temperature sensor module is less than or equal to the set threshold value of the temperature of the air in the tire, the Bluetooth module sends information for closing the air conditioning system and the inflating pump to the automobile ECU and the inflating pump electrifying valve.
7. A tire temperature reducing device for maintaining dynamic balance of tire pressure as claimed in claim 1, wherein the threshold value of the gas temperature in the tire is set to 20 ℃.
8. The tire cooling device for maintaining dynamic balance of tire pressure according to claim 1, wherein the rotation speed r of the inflator and the sectional area a of the air outlet of the control valve satisfy the following proportional relationship:
A/r＝k；
k is a scaling factor, and k is expressed as:
k＝(C×ρin)/(v×ρout)；
in the formula: c is the cylinder volume of the inflator pump, rhoinDensity of atmosphere, v mean flow velocity of gas discharged, poutIs the density of the gas within the tire.
9. A method for using the tire cooling device for maintaining dynamic balance of tire pressure according to any one of claims 1 to 8, comprising the steps of:
s1, setting a temperature threshold value through a control valve circuit system, when the temperature of gas in a tire is higher than the set temperature threshold value, controlling a Bluetooth module to respectively send information for controlling the opening of an automobile air-conditioning system and controlling the opening of an inflator pump to an automobile ECU and an inflator pump electrifying valve by a control module, starting the automobile air-conditioning refrigeration system by the automobile ECU, and opening the inflator pump by the inflator pump electrifying valve;
s2, sucking low-temperature air around the air conditioner evaporator through a cold air collecting wide mouth mask and an air delivery hose by an inflator pump, and delivering the sucked low-temperature air into the tire through the air delivery hose, a three-bent air delivery steel pipe, a spherical rotary ventilation shaft, a bent air delivery steel pipe, the air delivery hose and an inflation nozzle in sequence;
s3, when the Bluetooth module on the control valve circuit system sends information to the automobile ECU, the control module controls the relay module to close, the electromagnetic coil is electrified to generate a magnetic field, the electromagnetic coil moves leftwards under the attraction effect of the magnetic force of the permanent magnet, the electromagnetic coil drives the piston to move leftwards by the push rod, the port of the control valve air inlet to the piston cavity is opened, and high-temperature gas in the tire is discharged through the control valve air inlet, the piston cavity and the control valve air outlet;
s4, injecting low-temperature air into the tire, discharging high-temperature air from the tire, and reducing the temperature of air in the tire through the replacement of the low-temperature air and the high-temperature air in the tire;
s5, selecting the motor speed when the inflation pump works and the sectional area of the air outlet of the control valve to meet a certain proportional relation, so that the air quantity of low-temperature air entering the tire is the same as that of high-temperature air leaked from the tire, and the tire pressure of the tire is kept in dynamic balance;
s6, when the temperature sensor module in the control valve circuit system monitors that the temperature of the gas in the tire is lower than a set threshold value, the Bluetooth module in the control valve circuit system sends the information of closing the automobile air conditioning system and the inflator pump to the automobile ECU and the inflator pump electrifying valve respectively, the automobile ECU controls the vehicle-mounted air conditioning system to be closed, and the inflator pump electrifying valve controls the inflator pump to be closed;
s7, when the Bluetooth module on the control valve circuit system sends information to the automobile ECU, the control module controls the relay module to be disconnected, the electromagnetic coil is powered off, the magnetic field disappears, the elastic restoring force of the spring pulls the push rod, the piston and the electromagnetic coil move rightwards, the port of the air inlet of the control valve, which leads to the piston cavity, is closed, and air in the tire is not leaked out;
and S8, when the temperature of the air in the tire rises again and reaches the set temperature threshold value, repeating the steps S1 to S7, and reducing the temperature of the tire on the premise of maintaining the dynamic balance of the tire pressure through equal replacement of low-temperature air and high-temperature air in the tire.
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| CN202110507415.8A CN113108980B (en) | 2021-05-10 | 2021-05-10 | Tire cooling device and method for keeping dynamic balance of tire pressure |
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| CN114013224B (en) * | 2021-11-12 | 2024-04-02 | 深圳市元征科技股份有限公司 | Tire pressure control apparatus, tire, vehicle control apparatus, vehicle, and control method |
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