CN110217056A - A kind of Electric Motor Wheel tire automatic inflatable device of air and its control method - Google Patents

Abstract

The invention discloses a kind of Electric Motor Wheel tire automatic inflatable device of air, comprising: gas source；And control valve, it is connect with the gas source；Side assembly of devices is taken turns, is connected between the control valve and Electric Motor Wheel tire；Wheel side assembly of devices includes: hub motor shell air flue, and the inside of the hub motor shell is arranged in, and one end of the hub motor shell air flue is connected with the control valve；The inside of wheel rim is arranged in wheel rim air flue, and wheel rim air flue one end is connect with the other end of the hub motor shell air flue, and the other end of the wheel rim air flue is connect with Electric Motor Wheel tire.The present invention also provides a kind of control methods of Electric Motor Wheel tire automatic inflatable device of air, and the tire pressure of Electric Motor Wheel tire can be accurately controlled according to specific road conditions and environment, improves the adaptability of electric wheel truck, and improve the service life of Electric Motor Wheel tire.

Description

An electric wheel 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 an electric wheel 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.

In-wheel motor-driven vehicles are vehicles in which motors, deceleration devices, braking devices and other structures are centrally arranged in the wheel hubs, that is, vehicles driven by electric wheels. This arrangement is more compact in structure, has a higher energy conversion rate and increases the cruising range of electric vehicles. In recent years, the research on electric wheel technology has attracted more and more attention. It is precisely because of the high integration of electric wheel devices that automatic filling and discharging of tires The design and integration of air has brought a lot of difficulty, and some high-end models in the field of traditional vehicles are usually equipped with tire pressure monitoring devices to remind the driver to perform inflation and deflation operations when the tire pressure is in an unsafe state. It cannot realize the function of automatic inflation and deflation, and some devices need to add other components to realize the function of automatic inflation and deflation of the device, but it has complex structure, low integration and can only be applied to traditional vehicles with sufficient space However, there is not yet a set of perfect tire automatic inflation and deflation devices in the electric wheel drive vehicle field.

Contents of the invention

One object of the present invention is to design and develop an automatic tire inflation and deflation device for electric wheels, which is applied to the automatic tire inflation and deflation device of the highly integrated wheel assembly part of the electric wheel drive vehicle. The roads are all integrated into the device and arranged reasonably. It 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 and economy of the car. sex and driving safety.

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

The technical scheme provided by the invention is:

An electric wheel tire automatic inflation and deflation device, comprising:

air source; and

a control valve connected to the gas source;

Wheel side device assembly, which is connected between the control valve and the electric wheel tire;

The wheel rim assembly includes:

The wheel hub motor housing is arranged on the outer side of the wheel hub motor;

The hub motor housing air passage is arranged inside the hub motor housing, and one end of the hub motor housing air passage communicates with the control valve;

The rim air passage is arranged inside the rim, and one end of the rim air passage is connected to the other end of the hub motor casing air passage, and the other end of the rim air passage is connected to the electric wheel tire.

Preferably, the gas source includes:

air compressors; and

An 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, pressure boost control valve, inflation and deflation control valve, airway distribution device, multiple outlet control valves and the wheel side device assembly are all arranged on the chassis device driven by electric wheels.

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 air passage of the hub motor housing.

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 for an electric wheel 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 said 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, air channel distribution device, outlet control valve, hub motor housing air channel and rim air channel, 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 air passage of the wheel hub motor housing, the outlet control valve and the 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, 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.

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 electric wheel tire automatic inflation and deflation device provided by the present invention can greatly improve the ability of the electric wheel drive vehicle to travel in complex and harsh areas by adding it to the electric wheel drive vehicle, shorten the running time, and improve the operating efficiency , save fuel, prolong the service life of the vehicle, can monitor the tire pressure of the car tire in real time when the vehicle is running and parking, inflate, deflate, measure and maintain the pressure of the car tire, suitable for off-road vehicles driven by electric wheels, Heavy vehicles, mining 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 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 specific road conditions and environments, so that the tires can maintain different tire pressures under different road conditions and prolong the service life of the tires. life.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a schematic structural view of the wheel-side device assembly of the present invention.

Fig. 3 is a schematic diagram of the structure of the external side of the device of the present invention.

Fig. 4 is a schematic diagram of the structure of the other side of the device 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 an electric wheel 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 The device 190 is arranged inside four or more tires of the automobile driven by the electric wheel, and the air source device, the control valve, the control unit 170, a plurality of connecting pipes 165 and the wheel edge device assembly 150 are all arranged on the chassis device driven by the electric wheel. superior.

As shown in FIG. 1 , it is a schematic diagram of the overall structure of the present invention. The control valve includes: a pressure boost control valve 110 , a charge and discharge control valve 120 and a plurality of outlet control valves 141 , 142 , 143 , 144 , wherein , the boost control valve 110 is a two-position two-way solenoid valve, the inflation control valve 120 is a three-position four-way solenoid valve, and the outlet control valve is a two-position two-way solenoid valve. The tires correspond one by one, the outlet control valve 141 corresponds to the right front wheel, the outlet control valve 142 corresponds to the right rear wheel, the outlet control valve 143 corresponds to the right rear wheel, the outlet control valve 144 corresponds to the right front wheel, and the outlet control valve 142 corresponds to the right rear wheel. The number of valves is the same as the number of tires, and the air source device is arranged on the upper part of the chassis device driven by electric wheels. 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 transports the high-pressure gas to the gas storage tank 102 through a high-pressure pipeline, and maintains the internal pressure at a constant level through a pressure gauge. The filter 103 passes through the high-pressure pipeline and the gas storage tank 102 The purpose is to filter the gas entering the device, improve the life and work stability of the control valve and pipeline; one end of the booster control valve 110 is connected to the filter 103 of the gas source device through the first high-pressure air channel 161, and the booster The other end of the control valve 110 is connected with one end of the inflation and deflation control valve 120 through the second high-pressure air channel 162, and the inflation and deflation control valve 120 is also connected with the silencer valve 180 through the connection pipeline 165, when the device of the present invention deflates the tire , will not make noise, and the inflation and deflation control valve 120 has two stations, the first station 121 is the intake station, the second station 122 is the outlet station, and the inflation and deflation control valve 120 passes through the other end The third high-pressure air passage 163 is connected to the third high-pressure air passage 130, and a pressure sensor 164 is installed on the third high-pressure air passage 163 to monitor the pressure value of the third high-pressure air passage 163 at any time. The third high-pressure air passage 130 has an intake port and a plurality of air outlets, the number of air outlets of the third 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. A plurality of outlet control valves are arranged in one-to-one correspondence of the gas ports, and the other end of the outlet control valves is connected to the wheel rim assembly 150 in one-to-one correspondence through a plurality of connecting pipes 165 .

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 Figure 2, it is a structural schematic diagram of the wheel edge device assembly 150 according to the present invention. The automobile driven by the electric wheel is to arrange the structures such as the motor, the deceleration device and the braking device in the hub of the automobile. The tire 151 is connected to the rim 152, and the rim 152 is connected to the wheel hub motor housing 156. The inside of the hub motor housing 156 is a housing cavity, and the hub motor is inside the housing cavity. The hub motor shaft 155 drives the rotation of the tire. The wheel edge device assembly 150 described above includes: hub motor housing 156, hub motor housing air channel 157 and rim air channel 158; hub motor housing 156, which is arranged outside the hub motor and surrounded by the hub motor around; the hub motor housing air passage 157 is arranged inside the hub motor housing 156, and one end of the hub motor housing air passage 157 is connected to the outlet control valve through a connecting pipe 165, and the hub motor housing air passage 157 The other end of the rim air passage 158 is connected to the rim air passage 158, which is arranged inside the rim 11, and the other end of the rim air passage 158 is directly connected to the automobile tire 151, so that the gas can be transported to the interior of the automobile tire 151. Sealing rings 153 and 154 are used between the body air passage 157 and the rim air passage 158 to increase the sealing performance, and the air passages of the rim device assembly 150 are all integrated inside the electric wheel device.

As shown in Figure 3 and Figure 4, it is the overall structure diagram of the electric wheel tire automatic inflation and deflation device according to the present invention. The air passages of this device are all concentrated in the inside of the electric wheel device, and all other components are installed on the chassis device of the automobile. The upper part is highly integrated as a whole.

In the electric wheel tire automatic inflation and deflation device provided by the present invention, the distribution pipeline connected by the third high-pressure air passage 130 is connected with the hub motor casing air passage 157, and the hub motor casing air passage 157 is connected with the rim air passage 158 connected to each other, and finally communicated with the tires, according to the signal fed back to the control unit 170 by the pressure sensor 164 installed in the third high-pressure air channel 163 and the tire pressure monitoring device 190 installed in the four tires, the control unit 170 controls each The control of the valve realizes the function of charging and deflation of the device.

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 between the rim 152 and the hub motor shaft 155. The rim air passage 158 is connected, and to disable the device, the rim 152 can be rotated 90° clockwise or counterclockwise with respect to the hub motor shaft 155 on the basis of the normal working position. The airway 158 will not be connected, thereby achieving the purpose of manually disabling the device.

The electric wheel tire automatic inflation and deflation device provided by the present 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 Choose suitable tire pressure on different road surfaces to improve the passing capacity of the car; when the car is driving for a long distance, the tire heats up, and the device can detect and adjust the tire pressure at any time to avoid the occurrence of tire burst; Drive the car out of the dangerous zone and drive as far as possible; the device can reduce the tire pressure, thereby lowering 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 for an electric wheel 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 said 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, air channel distribution device, outlet control valve, hub motor housing air channel and rim air channel, 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 air passage of the wheel hub motor housing, the outlet control valve and the air passage distribution device, it is discharged into the atmosphere through the inflation and deflation control valve.

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 road mode, the weight of the vehicle 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% P _w < P _v < P _w , 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 pressure boost 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 The hub motor housing air passage connects to the rim air passage and ultimately the tire to inflate an under-inflated tire.

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 air channel distribution device installed on the tire corresponding to the high pressure tire. The outlet control valve is opened for deflation, the gas flows out from the tire, passes through the rim air passage, hub motor housing air passage, outlet control valve and gas distribution device in turn, and finally discharges to the In the atmosphere, so as to realize the function of deflating 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 (9)

1. a kind of Electric Motor Wheel tire automatic inflatable device of air characterized by comprising

Gas source；And

Control valve is connect with the gas source；

Side assembly of devices is taken turns, is connected between the control valve and Electric Motor Wheel tire；

Wherein, wheel side assembly of devices includes:

Hub motor shell is arranged on the outside of hub motor；

Hub motor shell air flue, is arranged in the inside of the hub motor shell, and the one of the hub motor shell air flue End is connected with the control valve；

The inside of wheel rim, and wheel rim air flue one end and the hub motor shell air flue is arranged in wheel rim air flue Other end connection, the other end of the wheel rim air flue are connect with Electric Motor Wheel tire.

2. Electric Motor Wheel tire automatic inflatable device of air as described in claim 1, which is characterized in that the gas source includes:

Air compressor；And

Air accumulator is connect with the air compressor.

3. Electric Motor Wheel tire automatic inflatable device of air as described in claim 1, which is characterized in that the control valve includes:

Supercharger control valve is connect with the gas source；

Charge and discharge gas control valve is connect with the supercharger control valve, and the charge and discharge gas control valve has air inlet station and goes out Gas station；

Air flue distributor, both ends are respectively air inlet and multiple gas outlets, and the air inlet and the charge and discharge gas control Valve connection processed；

Multiple discharge control valves are respectively corresponded and are fixedly mounted at multiple gas outlets of the air flue distributor；

Wherein, the gas source, supercharger control valve, charge and discharge gas control valve, air flue distributor, multiple discharge control valves and the wheel Side assembly of devices is arranged on the base apparatus using In-wheel-motor driving.

4. Electric Motor Wheel tire automatic inflatable device of air as claimed in claim 3, which is characterized in that further include:

Control unit is connect with the supercharger control valve, the charge and discharge gas control valve and the multiple discharge control valve simultaneously, And the supercharger control valve, the charge and discharge gas control valve and the multiple discharge control valve can be controlled respectively；

Device for monitoring tyre pressure is arranged in inside tires, and the device for monitoring tyre pressure is connect with described control unit.

5. Electric Motor Wheel tire automatic inflatable device of air as claimed in claim 3, which is characterized in that further include:

First high pressure air flue, is connected between the gas source and the supercharger control valve,

Second high pressure air flue is connected between the supercharger control valve and the charge and discharge gas control valve；

Third high pressure air flue is connected to air inlet one end of the charge and discharge gas control valve Yu the air flue distributor；

Multiple connecting pipes are connected to the other end of the multiple discharge control valve Yu the hub motor shell air flue Between.

6. a kind of control method of Electric Motor Wheel tire automatic inflatable device of air, which comprises the steps of:

Step 1: environment temperature, pavement temperature and road gradient being monitored by sensor, tire is monitored by device for monitoring tyre pressure Real-time tire pressure, and real-time tire pressure is transmitted to control unit；

Step 2: tire pressure standard of the real-time tire pressure in control unit is compared:

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

Control unit controls the air inlet station conducting of supercharger control valve and charge and discharge gas control valve, while controlling and the insufficient wheel of tire pressure The corresponding discharge control valve of tire is opened, and high pressure gas is successively from gas source by supercharger control valve, charge and discharge gas control valve, air flue distribution Device, discharge control valve, hub motor shell air flue and wheel rim air flue, are finally connected to tire；

If real-time tire pressure is greater than tire pressure standard, control unit selects following air bleeding mode:

Control unit controls supercharger control valve and closes, the outlet station conducting of control charge and discharge gas control valve, while control and tire pressure The corresponding discharge control valve of excessively high tire is opened, and gas is flowed out out of tire, successively passes through wheel rim air flue, hub motor shell After air flue, discharge control valve and air flue distributor, it is discharged into atmosphere by charge and discharge gas control valve.

7. the control method of Electric Motor Wheel tire automatic inflatable device of air as claimed in claim 6, which is characterized in that the tire pressure Standard is divided into Three models according to different road conditions:

When the road conditions are highway mode: tire pressure standard is 600KPa；

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

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

8. the control method of Electric Motor Wheel tire automatic inflatable device of air as claimed in claim 6, which is characterized in that filled described Under gas mode, the discharge control valve valve opening meets following condition:

If 75%P_w< P_v< P_wWhen, ov=40%；

If 50%P_w≤P_v< 75%P_wWhen, ov=75%；

If P_v≤ 50%P_wWhen, ov=100%；

Wherein, P_vFor real-time tire pressure, P_wFor tire pressure standard, OV is discharge control valve valve opening；

Under air bleeding mode, discharge control valve valve opening and meet following condition:

If P_w< P_v< 125%P_wWhen, ov=40%；

If P_v>=150%P_wWhen, ov=75%；

If 125%P_w≤P_v< 150%P_wWhen, ov=100%；

Wherein, P_vFor real-time tire pressure, P_wFor tire pressure standard, OV is discharge control valve valve opening.

9. the control method of Electric Motor Wheel tire automatic inflatable device of air as claimed in claim 6, which is characterized in that when car weight is full Foot: when 0 < m < 6000kg, tire pressure meets following condition:

When speed meets 0 < V≤80km/h, tire pressure meets:

Wherein, P_vFor the tire pressure of Electric Motor Wheel tire, β is beam angle in the front-wheel of Electric Motor Wheel tire, and ξ is road gradient, and m is vehicle Weight, g are acceleration of gravity, f_rFor the coefficient of friction of vehicle tyre and ground, f_vFor the rolling resistance of vehicle tyre, T₀For ring Border temperature, T₁For pavement temperature, K is weight coefficient, and V is Vehicle Speed；

Wherein, road gradient meets:

Wherein, τ is the angle of vehicle running surface and horizontal plane；

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

Wherein, P_vFor the tire pressure of Electric Motor Wheel tire, β is beam angle in the front-wheel of Electric Motor Wheel tire, and ξ is road gradient, and m is vehicle Weight, g are acceleration of gravity, f_rFor the coefficient of friction of vehicle tyre and ground, f_vFor the rolling resistance of vehicle tyre, τ is vehicle The angle of track and horizontal plane, T₀For environment temperature, T₁For pavement temperature, K is weight coefficient, and V is Vehicle Speed；

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

Wherein, P_vFor the tire pressure of Electric Motor Wheel tire, β is beam angle in the front-wheel of Electric Motor Wheel tire, and ξ is road gradient, and m is vehicle Weight, g are acceleration of gravity, f_rFor the coefficient of friction of vehicle tyre and ground, f_vFor the rolling resistance of vehicle tyre, T₀For ring Border temperature, T₁For pavement temperature, K is weight coefficient, S_fFor front face area of automobile；And

When car weight meets m >=20000kg, tire pressure meets:

Wherein, P_vFor the tire pressure of Electric Motor Wheel tire, β is beam angle in the front-wheel of Electric Motor Wheel tire, and ξ is road gradient, and m is vehicle Weight, g are acceleration of gravity, f_rFor the coefficient of friction of vehicle tyre and ground, f_vFor the rolling resistance of vehicle tyre, τ is vehicle The angle of track and horizontal plane, T₀For environment temperature, T₁For pavement temperature, K is weight coefficient, S_fFor front face area of automobile.