CN110154653A - A vehicle tire automatic inflation and deflation device and its control method - Google Patents

Abstract

The invention discloses an automatic inflation and deflation device for vehicle tires, comprising: an air source; and a control valve, which is connected with the air source; a wheel edge device assembly, which is connected between the control valve and the vehicle tire; The wheel edge device assembly includes: a steering throttle air passage, which is arranged inside the steering knuckle of the vehicle; a half-shaft air passage, which is arranged inside the half-shaft, and one end of the half-shaft air passage is connected to the sealed air chamber The sealed air chamber, which is arranged inside the steering knuckle, is annularly sleeved on the outside of the vehicle half shaft, and one side of the sealed air chamber is connected to the other end of the steering throttle air passage; the rim air passage, which is arranged on the vehicle rim Inside, one end of the rim air channel is connected to the other end of the half-shaft air channel, and the other end of the rim air channel is connected to a vehicle tire. The invention also provides a control method for the automatic tire inflation and deflation device of a vehicle, which can accurately control the tire pressure according to specific road conditions and environments, and improve the service life of the tires.

Description

A vehicle tire automatic inflation and deflation device and its control method

technical field

The invention relates to the technical field of automobile driving, and more specifically, the invention relates to a vehicle tire automatic inflation and deflation device and a control method thereof.

Background technique

With the development of the automobile industry, vehicles are gradually used in more fields, and people's requirements for vehicles are getting higher and higher. The tire automatic inflation and deflation device was originally used on military vehicles. During the Second World War In order to improve the passing performance of military vehicles, a central inflation and deflation device for tires was developed. With the gradual maturity of technology, this device is also gradually applied to civilian passenger cars and off-road vehicles. From the perspective of dynamics, the tire pressure is analyzed according to different road conditions. Adjusting to an appropriate range can maximize the use of ground adhesion conditions to improve vehicle power and passability, and tire pressure directly affects fuel consumption and tire wear. Therefore, controlling tire pressure in an appropriate range is important for improving vehicle passability, fuel Economical and driving safety are of great significance.

Some current high-end models are usually equipped with a tire pressure monitoring device to remind the driver to perform inflation and deflation operations when the tire pressure is in an unsafe state, but it can only serve as a reminder and requires the driver to manually charge and discharge There are also some devices that can be added to the vehicle to automatically adjust the tire pressure, but it requires more components to be installed and the integration of the device is low.

Contents of the invention

An object of the present invention is to design and develop a kind of vehicle tire automatic inflation and deflation device, which is applied to the tire automatic inflation and deflation device of the highly integrated wheel edge assembly part of the automobile, and the air channels of the wheel edge assembly are all integrated into the Inside the device, it is a device that can inflate, deflate, measure and maintain the tires of the car when parking or driving. The car equipped with this device greatly improves the passing performance, economy and driving safety of the car.

Another object of the present invention is to design and develop a control method for a vehicle tire automatic inflation and deflation device, which can accurately control the tire pressure of the vehicle wheel according to specific road conditions and environments, so that the tires can maintain different tire pressures under different road conditions. Extend the life of your tires.

The technical scheme provided by the invention is:

A vehicle tire automatic inflation and deflation device, comprising:

air source; and

a control valve connected to the gas source;

a wheel rim assembly connected between said control valve and a vehicle tire;

Wherein, the wheel rim assembly includes:

Steering throttle passage, which is arranged inside the steering knuckle of the vehicle, and one end of the steering throttle passage communicates with the control valve;

A sealed air chamber, which is arranged inside the steering knuckle and sleeved on the outside of the vehicle half shaft in a ring shape, and one side of the sealed air chamber is connected to the other end of the steering throttle air passage;

A half-shaft air passage, which is arranged inside the vehicle half-shaft, and one end of the half-shaft air passage is connected to the other side of the sealed air chamber;

A rim air channel, which is arranged inside the rim of the vehicle, one end of the rim air channel is connected to the other end of the half shaft air channel, and the other end of the rim air channel is connected to the vehicle tire;

A sealing gasket, which is a hollow disc structure, is rotatably arranged between the half shaft and the rim, and two air holes are provided on the sealing gasket, which are used to connect the air passage of the half shaft and the air passage of the rim connected.

Preferably, the gas source includes:

air compressors; and

The air storage tank is connected with the air compressor.

Preferably, the control valve includes:

a pressure boost control valve, which is connected to the gas source;

A charge and deflation control valve, which is connected to the boost control valve, and the charge and deflation control valve has an air intake station and an air outlet station;

An airway distribution device, the two ends of which are respectively an air inlet and a plurality of air outlets, and the air inlet is connected to the inflation and deflation control valve;

A plurality of outlet control valves, which are respectively fixedly installed at the plurality of air outlets of the airway distribution device;

Wherein, the air source, boost control valve, inflation and deflation control valve, airway distribution device, multiple outlet control valves and the wheel edge device assembly are all arranged on the chassis device of the vehicle.

Preferably, it also includes:

a control unit, which is simultaneously connected with the boost control valve, the inflation control valve, and the plurality of outlet control valves, and can control the boost control valve, the inflation control valve, and the plurality of outlet control valves respectively. a plurality of outlet control valves;

A tire pressure monitoring device is arranged inside the tire, and the tire pressure monitoring device is connected to the control unit.

Preferably, it also includes:

a first high-pressure air passage connected between the air source and the boost control valve,

a second high-pressure air passage connected between the boost control valve and the inflation and deflation control valve;

A third high-pressure air channel, which is connected to the air inlet end of the inflation and deflation control valve and the air channel distribution device;

A plurality of connecting pipes are respectively connected between the plurality of outlet control valves and the other end of the steering throttle passage.

Preferably, the boost control valve is a two-position two-way solenoid valve, the inflation and deflation control valve is a three-position four-way solenoid valve, and the outlet control valve is a two-position two-way solenoid valve.

A control method of a vehicle tire automatic inflation and deflation device, comprising the steps of:

Step 1: Monitor the ambient temperature, road surface temperature and road slope through the sensor, monitor the real-time tire pressure of the tire through the tire pressure monitoring device, and transmit the real-time tire pressure to the control unit;

Step 2: Compare the real-time tire pressure with the tire pressure standard in the control unit:

If the real-time tire pressure is lower than the tire pressure standard, the control unit selects the following inflation modes:

The control unit controls the conduction of the intake station of the boost control valve and the inflation control valve, and at the same time controls the opening of the outlet control valve corresponding to the tire with insufficient tire pressure. Air control valve, airway distribution device, outlet control valve, steering throttle, sealed air chamber, half shaft airway and rim airway, finally connected to the tire;

If the real-time tire pressure is greater than the tire pressure standard, the control unit selects the following deflation modes:

The control unit controls the pressurization control valve to close, controls the air outlet station of the inflation and deflation control valve to conduct, and at the same time controls the outlet control valve corresponding to the tire with high tire pressure to open, and the gas flows out from the tire, passing through the rim air channel, After the half-shaft air passage, sealed air chamber, steering throttle passage, outlet control valve and air passage distribution device, it is discharged into the atmosphere through the inflation and deflation control valve.

Preferably, the tire pressure standard is divided into three modes according to different road conditions:

When the road condition is road mode: the standard tire pressure is 600KPa;

When the road condition is off-road mode: the standard tire pressure is 450KPa;

When the road condition is soft mode: the standard tire pressure is 300KPa.

Preferably, in the inflation mode, the valve opening of the outlet control valve satisfies the following conditions:

If 75% of P _w <P _v <P _w , ov=40%;

If 50% P _w ≤ P _v <75% P _w , ov=75%;

If P _v ≤ 50% P _w , ov = 100%;

Among them, _Pv is the real-time tire pressure, _Pw is the tire pressure standard, and OV is the valve opening of the outlet control valve;

In deflation mode, the valve opening of the outlet control valve meets the following conditions:

If P _w <P _v <125%P _w , ov=40%;

If P _v ≥ 150% P _w , ov = 75%;

If 125% P _w ≤ P _v <150% P _w , ov=100%;

Among them, P _v is the real-time tire pressure, P _w is the tire pressure standard, and OV is the valve opening of the outlet control valve.

Preferably, when the vehicle weight satisfies: 0<m<6000kg, the tire pressure satisfies the following conditions:

When the vehicle speed satisfies 0<V≤80km/h, the tire pressure satisfies:

Among them, P _v is the tire pressure of the electric wheel tire, β is the toe angle of the front wheel of the electric wheel tire, ξ is the slope of the road, m is the weight of the vehicle, _g is the acceleration of gravity, and fr is the friction coefficient between the vehicle tire and the ground , f _v is the rolling resistance of the vehicle tire, T ₀ is the ambient temperature, T ₁ is the road surface temperature, K is the weight coefficient, V is the vehicle speed;

Among them, the road slope satisfies:

Among them, τ is the angle between the vehicle driving road surface and the horizontal plane;

When the vehicle speed meets V>80km/h, the tire pressure meets:

Among them, P _v is the tire pressure of the electric wheel tire, β is the toe angle of the front wheel of the electric wheel tire, ξ is the slope of the road, m is the weight of the vehicle, _g is the acceleration of gravity, and fr is the friction coefficient between the vehicle tire and the ground , f _v is the rolling resistance of the vehicle tire, τ is the angle between the vehicle driving road surface and the horizontal plane, T ₀ is the ambient temperature, T ₁ is the road surface temperature, K is the weight coefficient, V is the vehicle speed;

When the vehicle weight meets 6000kg≤m<20000kg, the tire pressure meets:

Among them, P _v is the tire pressure of the electric wheel tire, β is the toe angle of the front wheel of the electric wheel tire, ξ is the slope of the road, m is the weight of the vehicle, _g is the acceleration of gravity, and fr is the friction coefficient between the vehicle tire and the ground , f _v is the rolling resistance of the vehicle tire, T ₀ is the ambient temperature, T ₁ is the road surface temperature, K is the weight coefficient, S _f is the windward area of the vehicle; and

When the vehicle weight meets m≥20000kg, the tire pressure meets:

Among them, P _v is the tire pressure of the electric wheel tire, β is the toe angle of the front wheel of the electric wheel tire, ξ is the slope of the road, m is the weight of the vehicle, _g is the acceleration of gravity, and fr is the friction coefficient between the vehicle tire and the ground , f _v is the rolling resistance of vehicle tires, τ is the angle between the road surface of the vehicle and the horizontal plane, T ₀ is the ambient temperature, T ₁ is the road surface temperature, K is the weight coefficient, and S _f is the windward area of the vehicle.

Beneficial effects of the present invention:

(1) The vehicle tire automatic inflation and deflation device provided by the present invention can greatly improve the vehicle's ability to travel in complex and harsh areas by adding a vehicle tire central inflation and deflation device, shorten running time, improve operating efficiency, and save fuel , to extend the service life of the vehicle, it can be used to inflate, deflate, measure and maintain the tires of the vehicle when parking or driving. Vehicles, oil field vehicles, construction machinery vehicles, etc., can significantly improve the power and safety of vehicles, and have a good application prospect.

(2) The control method of the vehicle tire automatic inflation and deflation device provided by the present invention can accurately control the tire pressure of the vehicle tire according to specific road conditions and environments, so that the tires can maintain different tire pressures under different road conditions and prolong the life of the tires.

Description of drawings

Fig. 1 is a structural schematic diagram of the vehicle tire automatic inflation and deflation device according to the present invention.

Fig. 2 is a structural schematic diagram of the wheel edge device assembly of the present invention.

Fig. 3 is a schematic cross-sectional structure diagram of the airtight chamber of the present invention.

Fig. 4 is an isometric side view of the structure of the positioning sleeve of the present invention.

Fig. 5 is a schematic structural view of the sealing gasket of the present invention.

Fig. 6 is a structural isometric side view of the wheel edge device assembly of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

The present invention provides a vehicle tire automatic inflation and deflation device, which includes a tire pressure monitoring device 190, an air source device, a control valve, a control unit 170, a plurality of connecting pipes 165 and a wheel edge device assembly 150, wherein the tire pressure monitoring device 190 is arranged inside four or more tires of the vehicle driven by the vehicle, and the air source device, control valve, control unit 170, multiple connecting pipes 165 and wheel edge device assembly 150 are all arranged on the chassis device driven by the vehicle.

As shown in Fig. 1 , it is a schematic diagram of the overall structure of the present invention, and the control valve includes: a boost control valve 110, a charge and discharge control valve 120 and a plurality of outlet control valves, wherein the boost control valve 110 is The two-position two-way solenoid valve, the inflation and deflation control valve 120 is a three-position four-way solenoid valve, and the outlet control valve is a two-position two-way solenoid valve. 141 corresponds to the right front wheel, outlet control valve 142 corresponds to the right rear wheel, outlet control valve 143 corresponds to the right rear wheel, outlet control valve 144 corresponds to the right front wheel, and the number of outlet control valves is the same as the number of tires , the air source device is arranged on the upper part of the chassis device driven by the vehicle, the air source device includes: an air compressor 101, an air storage tank 102, a filter 103 and a plurality of high-pressure pipelines, and the air compressor 101 compresses the air in the environment into a high pressure Gas, and the high-pressure gas is transported into the gas storage tank 102 through the high-pressure pipeline, and the pressure inside it is maintained constant by the pressure gauge, the filter 103 is connected with the gas storage tank 102 through the high-pressure pipeline, and the purpose is to filter the gas entering the device Gas, improve the service life and work stability of the control valve and pipeline; one end of the boost control valve 110 is connected to the filter 103 of the gas source device through the first high-pressure air passage 161, and the other end of the boost control valve 110 is connected through the second The high-pressure air channel 162 is connected to one end of the inflation control valve 120, and the inflation control valve 120 is also connected to the silencer valve 180 through the connection pipe 165. When the device of the present invention deflates the tire, no noise will be emitted, and the inflation The air control valve 120 has two stations, the first station 121 is the air intake station, the second station 122 is the air outlet station, and the other end of the inflation and deflation control valve 120 is connected to the third station through the third high-pressure air passage 163. High-pressure air passage 130, and pressure sensor 164 is installed on the third high-pressure air passage 163, monitors the pressure value of the third high-pressure air passage 163 at any time, the third high-pressure air passage 130 has air inlet and a plurality of air outlets, the third The number of air outlets of the high-pressure air passage 130 is the same as the number of tires, and the air outlets of the third high-pressure air passage 130 correspond to the tires one by one, and a plurality of outlets of the third high-pressure air passage 130 correspond to one by one. The valve is connected to the wheel rim assembly 150 one by one through a plurality of connecting pipes 165 at the other end of the outlet control valve.

As shown in FIG. 1 , the tire pressure monitoring device 190 , the boost control valve 110 , the first station 121 and the second station 122 of the inflation control valve 120 and the third high-pressure airway 130 are all connected to the control unit 170 , The control unit 170 receives the real-time tire pressure signal from the tire pressure monitoring device 190, and the control unit 170 can respectively control the pressure boost control valve 110, the first station 121 and the second station 122 of the inflation control valve 120 and a plurality of outlets Control valve.

As shown in Fig. 2 and Fig. 3, it is a schematic structural view of the rim device assembly 150 of the present invention, the tire 191 of the vehicle is connected to the rim 192, and there is a brake disc 193 between the rim 192 and the half shaft 155, Steering knuckle 194 is connected on the axle shaft 155, and the wheel edge device assembly 150 of the present invention comprises: Steering throttle air passage 151, sealing ring 152, rim air passage 153, half shaft air passage 154, sleeve 156, sealing gas The chamber 157 and the sealing gasket 158, wherein the throttle air channel 151 is arranged inside the steering knuckle 194, one end of the throttle air channel 151 is connected to the connecting pipe 165, and the other end of the throttle air channel 151 is connected to one side of the sealed air chamber 157, The sealed air chamber 157 is arranged inside the steering knuckle 194 and surrounds the outside of the half shaft 155 in a ring shape. When the vehicle steering knuckle 194 rotates around the vehicle half shaft 155, the sealed air chamber 157 can ensure the communication between the steering throttle air passage 151 and the half shaft air passage 154, and a sleeve is arranged between the sealed air chamber 157 and the half shaft 155. Cylinder 156, as shown in Figure 4, the sleeve 156 can ensure the rotation and sealing performance of the sealed air chamber 157 and the half shaft air channel 154, the rim air channel 153 is arranged inside the rim 192, and one end of the rim air channel 153 is connected to the half shaft The other end of the air channel 154 is connected, the other end of the rim air channel 153 is connected with the tire 191, and the sealing gasket 158 is in the middle of the half shaft 155 and the rim 192, and the center of the sealing gasket 158 has an air channel, which ensures the air of the half shaft. For the sealing of the channel 154 and the rim air channel 153, the sealing washer 158 can be selectively rotated to block the semi-axis air channel 154 and the rim air channel 153, thereby disabling the device.

In the automatic tire inflation and deflation device for vehicles provided by the present invention, the distribution pipeline connected by the third high-pressure air channel 130 is connected with the air hole on the steering knuckle 194, and the steering throttle air channel 151 is connected to the half shaft air channel 154 through the sealed air chamber 157. Connected, the half-axis air channel 154 is connected with the rim air channel 153 through the air channel on the sealing gasket 158, and finally communicates with the tires, according to the pressure sensor 164 installed in the third high-pressure air channel 163 and installed in the four tires The tire pressure monitoring device 190 feeds back the signal to the control unit 170, and the function of inflation and deflation of the device is realized through the control of each control valve by the control unit 170.

In addition, in addition to disabling the device by disabling the outlet control valve, the device can also be disabled by changing the connection position of the sealing gasket 158 with the rim 192 and the half shaft 155, as shown in Figure 5 when the device is working normally. The air hole 160 communicates with the half-shaft air channel 154 and the rim air channel 153. To disable the device, the sealing gasket 158 can be rotated 45° clockwise or counterclockwise relative to the rim 192. At this time, the air hole 160 of the sealing gasket is rotated 45° It will not be able to communicate with the half-shaft air passage 154 and the rim air passage 153, and the sealing gasket 158 will seal the communication between the half-shaft air passage 154 and the rim air passage 153, thereby achieving the purpose of manually disabling the device.

As shown in FIG. 6 , it is an overall side view structural view of the tire automatic inflation and deflation device according to the present invention. The entire device is arranged inside the vehicle tire, which is safer, simpler and more space-saving.

The vehicle tire automatic inflation and deflation device provided by the invention can be used to inflate, deflate, measure and maintain the tires of automobiles when parking or driving, and can detect and adjust the tire pressure conveniently and quickly, so that the automobile can be adjusted according to different Choose the right tire pressure on the road surface to improve the passing capacity of the car; when the car is driving for a long distance, the tire heats up, the device can detect and adjust the tire pressure at any time to avoid the occurrence of tire burst; when the tire is punctured, it can be inflated while driving , to keep the car out of the dangerous zone and drive as far as possible; the tire pressure can be reduced through this device, thereby reducing the height of the car so that the car can pass through places with height restrictions. Or by reducing the tire pressure, increase the adhesion of the tire to the ground, and pass through some road conditions that are easy to cause the vehicle to slip or sink, such as sandy beaches, snowy ground, wet ground and other road surfaces.

The present invention also provides a control method of a vehicle tire automatic inflation and deflation device, comprising the following steps:

Step 1: Monitor the ambient temperature, road surface temperature and road slope through the sensor, monitor the real-time tire pressure of the tire through the tire pressure monitoring device, and transmit the real-time tire pressure to the control unit;

Step 2: Compare the real-time tire pressure with the tire pressure standard in the control unit:

If the real-time tire pressure is lower than the tire pressure standard, the control unit selects the following inflation modes:

The control unit controls the conduction of the intake station of the boost control valve and the inflation control valve, and at the same time controls the opening of the outlet control valve corresponding to the tire with insufficient tire pressure. Air control valves, airway distribution devices, outlet control valves, steering throttles, sealed air chambers, half-shaft airways and rim airways, which are finally connected to tires to inflate tires with insufficient air pressure;

If the real-time tire pressure is greater than the tire pressure standard, the control unit selects the following deflation modes:

The control unit controls the pressurization control valve to close, controls the air outlet station of the inflation and deflation control valve to conduct, and at the same time controls the outlet control valve corresponding to the tire with high tire pressure to open, and the gas flows out from the tire, passing through the rim air channel, After the half-shaft air passage, sealed air chamber, steering throttle passage, outlet control valve and air passage distribution device, it is discharged into the atmosphere through the inflation and deflation control valve, thereby realizing deflation of tires.

Step 2.1, the tire pressure standard is divided into three modes according to different road conditions:

Highway mode: mainly includes hard asphalt or cement road conditions, the tire pressure standard is 600KPa;

Off-road mode: mainly includes simple road conditions such as fields, Gobi, and deserts, and the tire pressure standard is 450KPa;

Soft mode: mainly includes sandy, snowy, muddy road conditions, the standard tire pressure is 300KPa.

In step 2, each valve has three opening degrees of 40%, 75% and 100%. The opening degree of the valve can be controlled by the control unit. In the inflation mode, the valve opening degree of the outlet control valve and the real-time tire pressure of the tire satisfy the following condition:

If 75% of P _w <P _v <P _w , ov=40%;

If 50% P _w ≤ P _v <75% P _w , ov=75%;

If P _v ≤ 50% P _w , ov = 100%;

Among them, P _v is the real-time tire pressure, P _w is the tire pressure standard, and OV is the valve opening;

In the deflation mode, the valve opening of the outlet control valve and the real-time tire pressure of the tire meet the following conditions:

If P _w <P _v <125%P _w , ov=40%;

If P _v ≥ 150% P _w , ov = 75%;

If 125% P _w ≤ P _v <150% P _w , ov=100%;

Among them, P _v is the real-time tire pressure, P _w is the tire pressure standard, and OV is the valve opening.

The real-time tire pressure is affected by the speed and weight of the vehicle driven by electric wheels. When the vehicle weight meets: 0<m<6000kg, the tire pressure is mainly affected by the speed.

When the vehicle speed satisfies 0<V≤80km/h, the tire pressure satisfies:

Among them, P _v is the tire pressure of the electric wheel tire, β is the toe angle of the front wheel of the electric wheel tire, ξ is the slope of the road, m is the weight of the vehicle, _g is the acceleration of gravity, and fr is the friction coefficient between the vehicle tire and the ground , f _v is the rolling resistance of the vehicle tire, T ₀ is the ambient temperature, T ₁ is the road surface temperature, K is the weight coefficient, V is the vehicle speed;

Among them, the road slope satisfies:

Among them, τ is the angle between the vehicle driving road surface and the horizontal plane;

When the vehicle speed meets V>80km/h, the tire pressure meets:

Among them, P _v is the tire pressure of the electric wheel tire, β is the toe angle of the front wheel of the electric wheel tire, ξ is the slope of the road, m is the weight of the vehicle, _g is the acceleration of gravity, and fr is the friction coefficient between the vehicle tire and the ground , f _v is the rolling resistance of the vehicle tire, τ is the angle between the vehicle driving road surface and the horizontal plane, T ₀ is the ambient temperature, T ₁ is the road surface temperature, K is the weight coefficient, V is the vehicle speed;

When the vehicle weight is above 6000kg, the tire pressure is mainly affected by the vehicle weight. When the vehicle weight meets 6000kg≤m<20000kg, the tire pressure meets:

Among them, P _v is the tire pressure of the electric wheel tire, β is the toe angle of the front wheel of the electric wheel tire, ξ is the slope of the road, m is the weight of the vehicle, _g is the acceleration of gravity, and fr is the friction coefficient between the vehicle tire and the ground , f _v is the rolling resistance of vehicle tires, T ₀ is the ambient temperature, T ₁ is the road surface temperature, K is the weight coefficient, S _f is the windward area of the vehicle;

When the vehicle weight meets m≥20000kg, the tire pressure meets:

Among them, P _v is the tire pressure of the electric wheel tire, β is the toe angle of the front wheel of the electric wheel tire, ξ is the slope of the road, m is the weight of the vehicle, _g is the acceleration of gravity, and fr is the friction coefficient between the vehicle tire and the ground , f _v is the rolling resistance of vehicle tires, τ is the angle between the road surface of the vehicle and the horizontal plane, T ₀ is the ambient temperature, T ₁ is the road surface temperature, K is the weight coefficient, and S _f is the windward area of the vehicle.

Among them, the windward area of the car satisfies:

S _f =0.81bh

Among them, S _f is the windward area of the vehicle, b is the width of the vehicle, and h is the height of the vehicle.

In one embodiment, the included angle between the driving road surface of the vehicle and the horizontal plane is 18°, that is, the road surface slope is 20°, the ambient temperature is 24°C, the road surface temperature is 36°C, and the toe angle of the front wheel of the vehicle tire is 9°. The friction coefficient between vehicle tires and the ground ranges from 1.1 to 1.5. The rolling resistance coefficient of vehicle tires in road mode ranges from 0.01 to 0.018. The rolling resistance coefficient of vehicle tires in off-road mode ranges from 0.025 to 0.03. When the rolling resistance coefficient is in soft mode, the range is 0.1-0.25, and the rolling resistance of vehicle tires meets:

f _v = f ₁ m

Among them, f _v is the rolling resistance of the vehicle tire, f ₁ is the rolling resistance coefficient of the vehicle tire, and m is the weight of the vehicle.

In road mode, the weight of the vehicle is 2500kg, the friction coefficient between the vehicle tire and the ground is 1.1, the acceleration of gravity is 9.8m/s ² , and the rolling resistance coefficient of the vehicle tire is 0.015, that is, the rolling resistance of the vehicle tire is 37.5N. When it is 80km/h, the weight coefficient is 0.0029, the real-time tire pressure of the vehicle is 593.1KPa, which satisfies 75% P _w < P _v < P _w , so the inflation mode should be selected, and the valve opening is 40%.

In another embodiment, in road mode, the weight of the vehicle is 2500kg, the angle between the road surface of the vehicle and the horizontal plane is 18°, that is, the slope of the road surface is 20°, the ambient temperature is 24°C, and the road surface temperature is 36°C. The toe angle of the front wheel of the tire is 9°, the friction coefficient between the vehicle tire and the ground is 1.1, the acceleration of gravity is 9.8m/s ² , and the rolling resistance coefficient of the vehicle tire is 0.015, that is, the rolling resistance of the vehicle tire is 37.5N. When the vehicle speed is 90km/h, the weight coefficient is 4.63, the real-time tire pressure of the vehicle is 629.22KPa, which satisfies P _w <P _v <125%P _w , so the deflation mode should be selected, and the valve opening is 40%.

In another embodiment, in the road mode, the vehicle weight is 9000kg, the angle between the road surface of the vehicle and the horizontal plane is 18°, that is, the slope of the road surface is 20°, the ambient temperature is 24°C, and the road surface temperature is 36°C. The toe angle of the front wheel of the tire is 9°, the friction coefficient between the vehicle tire and the ground is 1.1, the acceleration of gravity is 9.8m/s ² , and the rolling resistance coefficient of the vehicle tire is 0.015, that is, the rolling resistance of the vehicle tire is 37.5N. The width of the vehicle is 3.3m, and the height of the vehicle is 2.8m, so the frontal area of the vehicle is 7.4844m ² , the weight coefficient is 121.13, and the real-time tire pressure of the vehicle is 617.58KPa, satisfying P _w <P _v <125%P _w , should Select the deflation mode, the valve opening is 40%.

In another embodiment, in the road mode, the vehicle weight is 23000kg, the angle between the road surface of the vehicle and the horizontal plane is 18°, that is, the slope of the road surface is 20°, the ambient temperature is 24°C, and the road surface temperature is 36°C. The toe angle of the front wheel of the tire is 9°, the friction coefficient between the vehicle tire and the ground is 1.1, the acceleration of gravity is 9.8m/s ² , and the rolling resistance coefficient of the vehicle tire is 0.015, that is, the rolling resistance of the vehicle tire is 37.5N. The width of the vehicle is 3.3m, and the height of the vehicle is 2.8m, so the frontal area of the vehicle is 7.4844m ² , the weight coefficient is 27.88, and the real-time tire pressure of the vehicle is 551.26KPa, satisfying 75% _w P < _v P < _w P, so Inflation mode should be selected with a valve opening of 40%.

When the tire of the vehicle is punctured or leaks air, the control unit will control the opening of the boost control valve, the inflation control valve and the outlet control valve to 100%, so that the tires of the vehicle can be inflated while driving, Get the car out of the danger zone and drive as far as possible.

The working process of the control method of an electric wheel tire automatic inflation and deflation device provided by the present invention is as follows:

Inflation mode: monitor the tire information of the vehicle through the tire pressure monitoring device installed inside the tire and send the tire information to the control unit, and make a judgment after comparing with the optimal tire pressure. When the tire pressure is insufficient, the control unit controls The pressurization control valve is opened, and the first station of the inflation and deflation control valve is controlled to conduct, and at the same time, the outlet control valve installed on the airway distribution device corresponding to the tire with insufficient air pressure is controlled to open, and the high-pressure gas passing through the outlet control valve passes through Steering air passages, sealed air chambers, half-shaft air passages are connected to rim air passages, and finally connected to tires to inflate under-inflated tires.

Deflation mode: when the tire pressure is too high, the control unit controls the pressure boost control valve to close, controls the second station of the inflation and deflation control valve to conduct, and at the same time controls the airway distribution device installed on the tire corresponding to the high pressure tire. The outlet control valve is opened for deflation, and the gas flows out from the tire, passing through the rim air passage, half shaft air passage, sealing air chamber, steering throttle passage, outlet control valve and gas distribution device in turn, and then passes through the inflation and deflation control valve and The muffler valve finally discharges into the atmosphere, thereby realizing the function of deflation of the tire.

The control method of the electric wheel tire automatic inflation and deflation device provided by the present invention can accurately control the tire pressure of the electric wheel tire according to the specific road conditions and environment, so that the tire can maintain different tire pressures under different road conditions, and improve the use of the electric wheel tire life and save money.

Although the embodiment of the present invention has been disclosed as above, it is not limited to the use listed in the specification and implementation, it can be applied to various fields suitable for the present invention, and it can be easily understood by those skilled in the art Therefore, the invention is not limited to the specific details and examples shown and described herein without departing from the general concept defined by the claims and their equivalents.

Claims (10)

1. A vehicle tire automatic inflation and deflation device, characterized in that it comprises: air source; and a control valve connected to the gas source; a wheel rim assembly connected between said control valve and a vehicle tire; Wherein, the wheel rim assembly includes: Steering throttle passage, which is arranged inside the steering knuckle of the vehicle, and one end of the steering throttle passage communicates with the control valve; A sealed air chamber, which is arranged inside the steering knuckle and sleeved on the outside of the vehicle half shaft in a ring shape, and one side of the sealed air chamber is connected to the other end of the steering throttle air passage; A half-shaft air passage, which is arranged inside the vehicle half-shaft, and one end of the half-shaft air passage is connected to the other side of the sealed air chamber; A rim air channel, which is arranged inside the rim of the vehicle, one end of the rim air channel is connected to the other end of the half shaft air channel, and the other end of the rim air channel is connected to the vehicle tire; A sealing gasket, which is a hollow disc structure, is rotatably arranged between the half shaft and the rim, and two air holes are provided on the sealing gasket, which are used to connect the air passage of the half shaft and the air passage of the rim connected. 2. The vehicle tire automatic inflation and deflation device according to claim 1, wherein the air source comprises: air compressors; and The air storage tank is connected with the air compressor. 3. The vehicle tire automatic inflation and deflation device according to claim 2, wherein the control valve comprises: a pressure boost control valve, which is connected to the gas source; A charge and deflation control valve, which is connected to the boost control valve, and the charge and deflation control valve has an air intake station and an air outlet station; An airway distribution device, the two ends of which are respectively an air inlet and a plurality of air outlets, and the air inlet is connected to the inflation and deflation control valve; A plurality of outlet control valves, which are respectively fixedly installed at the plurality of air outlets of the airway distribution device; Wherein, the air source, boost control valve, inflation and deflation control valve, airway distribution device, multiple outlet control valves and the wheel edge device assembly are all arranged on the chassis device of the vehicle. 4. The vehicle tire automatic inflation and deflation device according to claim 3, further comprising: a control unit, which is simultaneously connected with the boost control valve, the inflation control valve, and the plurality of outlet control valves, and can control the boost control valve, the inflation control valve, and the plurality of outlet control valves respectively. a plurality of outlet control valves; A tire pressure monitoring device is arranged inside the tire, and the tire pressure monitoring device is connected to the control unit. 5. The vehicle tire automatic inflation and deflation device according to claim 4, further comprising: a first high-pressure air passage connected between the air source and the boost control valve, a second high-pressure air passage connected between the boost control valve and the inflation and deflation control valve; A third high-pressure air channel, which is connected to the air inlet end of the inflation control valve and the air channel distribution device; A plurality of connecting pipes are respectively connected between the plurality of outlet control valves and the other end of the steering throttle passage. 6. The vehicle tire automatic inflation and deflation device according to claim 5, characterized in that, the boost control valve is a two-position two-way solenoid valve, and the inflation and deflation control valve is a three-position four-way solenoid valve, The outlet control valve is a two-position two-way solenoid valve. 7. A control method for an automatic tire inflation and deflation device for a vehicle, comprising the steps of: Step 1: Monitor the ambient temperature, road surface temperature and road slope through the sensor, monitor the real-time tire pressure of the tire through the tire pressure monitoring device, and transmit the real-time tire pressure to the control unit; Step 2: Compare the real-time tire pressure with the tire pressure standard in the control unit: If the real-time tire pressure is lower than the tire pressure standard, the control unit selects the following inflation modes: The control unit controls the conduction of the intake station of the boost control valve and the inflation control valve, and at the same time controls the opening of the outlet control valve corresponding to the tire with insufficient tire pressure. Air control valves, air channel distribution devices, outlet control valves, steering throttle channels, sealed air chambers, half shaft air channels and rim air channels, finally connected to tires; If the real-time tire pressure is greater than the tire pressure standard, the control unit selects the following deflation modes: The control unit controls the pressurization control valve to close, controls the air outlet station of the inflation and deflation control valve to conduct, and at the same time controls the outlet control valve corresponding to the tire with high tire pressure to open, and the gas flows out from the tire, passing through the rim air channel, After the half-shaft air passage, sealed air chamber, steering throttle passage, outlet control valve and air passage distribution device, it is discharged into the atmosphere through the inflation and deflation control valve. 8. The control method of the vehicle tire automatic inflation and deflation device according to claim 7, wherein the tire pressure standard is divided into three modes according to different road conditions: When the road condition is road mode: the standard tire pressure is 600KPa; When the road condition is off-road mode: the standard tire pressure is 450KPa; When the road condition is soft mode: the standard tire pressure is 300KPa. 9. The control method of the vehicle tire automatic inflation and deflation device according to claim 7, characterized in that, in the inflation mode, the valve opening of the outlet control valve satisfies the following conditions: If 75% of P _w <P _v <P _w , ov=40%; If 50% P _w ≤ P _v <75% P _w , ov=75%; If P _v ≤ 50% P _w , ov = 100%; Among them, _Pv is the real-time tire pressure, _Pw is the tire pressure standard, and OV is the valve opening of the outlet control valve; In deflation mode, the valve opening of the outlet control valve meets the following conditions: If P _w <P _v <125%P _w , ov=40%; If P _v ≥ 150% P _w , ov = 75%; If 125% P _w ≤ P _v <150% P _w , ov=100%; Among them, P _v is the real-time tire pressure, P _w is the tire pressure standard, and OV is the valve opening of the outlet control valve. 10. The control method of the vehicle tire automatic inflation and deflation device according to claim 7, characterized in that, when the vehicle weight satisfies: 0<m<6000kg, the tire pressure satisfies the following conditions: When the vehicle speed satisfies 0<V≤80km/h, the tire pressure satisfies: Among them, P _v is the tire pressure of the electric wheel tire, β is the toe angle of the front wheel of the electric wheel tire, ξ is the slope of the road, m is the weight of the vehicle, _g is the acceleration of gravity, and fr is the friction coefficient between the vehicle tire and the ground , f _v is the rolling resistance of the vehicle tire, T ₀ is the ambient temperature, T ₁ is the road surface temperature, K is the weight coefficient, V is the vehicle speed; Among them, the road slope satisfies: Among them, τ is the angle between the vehicle driving road surface and the horizontal plane; When the vehicle speed meets V>80km/h, the tire pressure meets: Among them, P _v is the tire pressure of the electric wheel tire, β is the toe angle of the front wheel of the electric wheel tire, ξ is the slope of the road, m is the weight of the vehicle, _g is the acceleration of gravity, and fr is the friction coefficient between the vehicle tire and the ground , f _v is the rolling resistance of the vehicle tire, τ is the angle between the vehicle driving road surface and the horizontal plane, T ₀ is the ambient temperature, T ₁ is the road surface temperature, K is the weight coefficient, V is the vehicle speed; When the vehicle weight meets 6000kg≤m<20000kg, the tire pressure meets: Among them, P _v is the tire pressure of the electric wheel tire, β is the toe angle of the front wheel of the electric wheel tire, ξ is the slope of the road, m is the weight of the vehicle, _g is the acceleration of gravity, and fr is the friction coefficient between the vehicle tire and the ground , f _v is the rolling resistance of the vehicle tire, T ₀ is the ambient temperature, T ₁ is the road surface temperature, K is the weight coefficient, S _f is the windward area of the vehicle; and When the vehicle weight meets m≥20000kg, the tire pressure meets: Among them, P _v is the tire pressure of the electric wheel tire, β is the toe angle of the front wheel of the electric wheel tire, ξ is the slope of the road, m is the weight of the vehicle, _g is the acceleration of gravity, and fr is the friction coefficient between the vehicle tire and the ground , f _v is the rolling resistance of vehicle tires, τ is the angle between the road surface of the vehicle and the horizontal plane, T ₀ is the ambient temperature, T ₁ is the road surface temperature, K is the weight coefficient, and S _f is the windward area of the vehicle.