WO2011069354A1

WO2011069354A1 - Power-assisted device for transport vehicle

Info

Publication number: WO2011069354A1
Application number: PCT/CN2010/072918
Authority: WO
Inventors: 刘如
Original assignee: Liu Ru
Priority date: 2009-12-10
Filing date: 2010-05-19
Publication date: 2011-06-16
Also published as: CN101708743A

Abstract

A power-assisted device for a transport vehicle includes a set of power-assisted baffles, each of which is disposed on the top of said transport vehicle and forms an attack angle of 0 to 9 degrees with respect to the vehicle body in the traveling direction of the vehicle. By applying the aerodynamic principle, the device provides the transport vehicle with extra lifting force and reduces the frictional resistance between the vehicle and a rail or the ground, thereby considerably lowering the energy consumption of the vehicle on electric power and fuel, lessening the environmental pollution, and also reducing the implementation cost of the whole solution at the same time. A transport vehicle equipped with multiple said devices at a preset interval on the top thereof is also provided.

Description

Power assist device for transportation vehicles

The invention relates to the field of land transportation, and in particular to a power assisting device for a transportation vehicle. Background technique

At present, the transportation schemes for passenger and cargo transportation by means of trains, automobiles, subways, light rails and other means have occupied a very important position in economic development. The above-mentioned means of transportation can easily and quickly realize the economic development requirements of passenger transportation and freight transportation, but at the same time, it also brings a lot of energy consumption and environmental pollution problems.

In order to minimize the consumption of energy, in the prior art, technical improvements are often made in the power system and the material of the transportation vehicle, as well as improvements in the road environment. Although this has achieved significant energy saving effects, The cost is also considerable.

In view of this, there is a need to provide a new method of reducing energy consumption, while saving energy while maintaining implementation costs in a lower range. Summary of the invention

Embodiments of the present invention provide a power assisting device for a transportation vehicle, which is used to save energy while reducing implementation cost.

The specific technical solutions provided by the embodiments of the present invention are as follows:

A power assist device for a transportation vehicle includes a set of power assisting baffles, each of which is disposed at a top of the transportation vehicle and forms [0, 9] degrees with the vehicle body in a traveling direction of the vehicle Angle of attack.

A transportation vehicle comprising: a set of power-assisting baffles disposed at a top of the transportation vehicle, each of the power-assist baffles forming an angle of attack of [0, 9] degrees with the vehicle body in a direction of travel of the vehicle as the vehicle travels . In the embodiment of the present invention, by using the aerodynamic principle, a device similar to the wing of the aircraft is installed on a land transportation vehicle such as a train or a car that runs at a high speed, so that additional lift is obtained, and the vehicle and the rail and the ground are reduced. The frictional resistance greatly reduces the energy consumption of the vehicle in terms of electricity and oil, and also reduces the pollution to the environment, and at the same time reduces the realization cost of the overall solution. DRAWINGS

1 is a schematic view showing the structure of a car seat with wings installed in an embodiment of the present invention;

2 is a schematic view showing the principle of force applied to wings according to an embodiment of the present invention;

3 and FIG. 4 are schematic diagrams showing the relationship between the lift coefficient and the drag coefficient and the angle of attack respectively according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a wing angle when a vehicle is traveling at a low speed according to an embodiment of the present invention; FIG.

Figure 6 is a schematic view showing the angle of the wings during braking of the vehicle in the embodiment of the present invention. Detailed ways

In order to reduce the energy (such as electric power and fuel consumption) consumed by a transportation vehicle while traveling, in the embodiment of the present invention, a heavy-duty, high-speed transportation vehicle (such as a train, a car, etc.) is used by using the principle of aerodynamics. The vehicle roof is equipped with a plurality of power assisting devices. In the following embodiments, the device is referred to as a "wing". In this embodiment, the so-called wings are a set of power-assisting baffles, and each boosting baffle is disposed in the The top of the transportation vehicle forms an angle of attack of [0, 9] degrees with the vehicle body in the direction of travel of the vehicle. In this way, when the transportation vehicle is running at a high speed, a certain lift can be obtained, which is equivalent to reducing the load of the transportation vehicle, thereby reducing the power consumption of the traction motor, the engine, and the fuel consumption, thereby achieving energy saving and emission reduction. Environmentally friendly.

In addition, if the "wings" are matched with the brake control system, when the locomotive brakes, the angle of the "wings" can be adjusted to "negative angle", and the lift can be changed into air resistance to achieve the purpose of assisting the brake. In order to reduce the braking distance, it is possible to reduce the wear of the brake system thus generated, and also to reduce the probability of danger in an emergency. Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the prior art, the lift generated by the wings of the aircraft can lift the aircraft up. Similarly, applying this principle to a high-speed land transport vehicle can use the generated lift to offset some of the load, thereby reducing traffic. The frictional resistance between the transport vehicle and the ground or rails, in order to reduce energy consumption.

Based on the above principle, referring to FIG. 1 and FIG. 2, in the embodiment of the present invention, taking a train as an example, after installing the wings on the top of the train, the lift obtained by the wings is set to L, and the air resistance obtained by the wings is set to Fd. Set the total weight of the wings and the related equipment used for installation to G, and assuming that the friction coefficient of the rail and the wheel is μ = 0.1 (data provided in the prior art), then when the above parameters satisfy the relationship shown by the following formula, The technical solution of the invention is feasible:

( L - G ) μ - Fd X)

Studying the content of the wing part in aerodynamics can be known: different wing shapes, different angles of attack (angle of attack, also known as ANGLE OF ATTACK, in the embodiment of the invention refers to the angle of the wings and the horizontal direction) The kinetic characteristics are different, and the lift coefficient and drag coefficient are different. In the embodiment of the present invention, considering the factors of the manufacturing process, the manufacturing cost and the space limitation, it is preferable to adopt a "flat convex" wing, as shown in FIG. 1, the shape of the wing close to the top of the compartment. In the flat shape, the shape away from the top of the compartment is convex (that is, the "flat convex" wing resembles the surface structure of the wing), and the shape, size and area of the wing can be adjusted according to the specific application environment. The design can achieve the desired technical effect as long as its aspect ratio is less than the set threshold. The Aspect Ratio is a term for aircraft aerodynamics and is defined as the ratio of the wing's squared to the wing's area:

Where AR is the aspect ratio, b is the span length, and S is the wing area. The use of a small aspect ratio (that is, setting the aspect ratio is less than the set threshold) is because the shape and size of the wings are limited by the width of the compartment, but it is possible to increase the lifting force by adding a plurality of "wings", between the wings. The spacing is preferably about 50 cm. On the other hand, in the embodiment, the technical effect and the realization cost are taken into consideration, and preferably, the material shield of the wing may be an aluminum alloy or a composite material.

Referring to Figure 3, Figure (a) shows the relationship between the lift coefficient CL and the angle of attack, and Figure (b) shows the relationship between the drag coefficient CD and the angle of attack. It can be seen from Fig. 3 that as the angle of attack increases, both the lift coefficient and the drag coefficient increase, but not linearly. Therefore, the angle between the wing and the roof needs to be controlled within a certain range to achieve the desired. effect.

It can be seen from the above formula (L - G ) μ - Fd X) that the greater the difference between the lift L and the resistance Fd, the better the effect of reducing the load, as shown in Figures 3 and 4, based on experimental data. It is concluded that when the angle of attack is within the range of [0, 9] degrees, the lift obtained by the wings is incremental, and when it is greater than 9 degrees, the airflow on the upper surface of the airfoil will be severely separated, causing a sudden drop in lift. It is called a stall phenomenon. Therefore, the angle of attack with [0, 9] degrees can be achieved as the technical effect of the vehicle's "weight reduction", and when the angle of attack is 9 degrees, the maximum value is upgraded, and the difference between the lift L and the resistance Fd is the largest. It can be seen that the best angle of attack is 9 degrees, that is, the "weight reduction" effect is best at this time.

The following is an example of a specific transportation vehicle with an angle of attack of 9 degrees, which is an example of the "weight reduction" effect of the wings.

Assume that the air density of the ground is p = 1.29 kg/m ³ .

The lift of the wing L is calculated as:

L = l/2 p V ² S CL

Where L is the lift, S is the area of the wing plane, V is the speed at which the vehicle travels in the air, and P is the air density and CL is the lift coefficient.

The formula for the resistance of the wing D is:

D= 1/2 p V ² S CD

Where D is the resistance, S is the area of the wing plane, V is the speed at which the vehicle travels in the air, and P is the air density and CD is the drag coefficient.

In one embodiment, it is assumed that the EMU has eight sets of cars per group, each of which is 24 meters long and 2.85 meters wide. The plane area of each wing is 2.8m (in the width of the carriage) X 1.8m (in the length of the carriage) = 5.04m ² , each wing is 2 meters apart), the motor is designed with 48 wings, and its total wing surface The product is 5.04m ² x 48 = 241.92 m ² , and the friction coefficient between the train and the rail is usually μ=0.1.

When the speed of the EMU is 200 km (excluding the influence of wind speed), it can be seen from Fig. 4 that at 9 degree angle of attack, CL=L48, CD=0.08, the difference between lift L and resistance Fd is the largest, at this time, the motor train Groups can save the most energy.

According to the above calculation formula of upgrade and resistance, you can get:

L=l/2pV ² S CL=0.5*1.29*55.56 ² *241.92*1.48=712,880(N)

D= 1/2 p V ² S Cd=0.5*1.29*55.56 ² *241.92*0.08=38,535(N)

Assuming that the mass of each wing is approximately 50 kg, the total weight W of the wings can be expressed as:

W= (50X48) *g=2,400*9.8=23,520(N)

Then, by changing the weight of the EMU by installing the wings, the effect can be expressed in the following ways:

Converted to saved traction F can be expressed as:

F= (L-W) μ - D=(712880-23520)*0.1-38535=30,401(N)

The converted traction power P can be expressed as:

P=FV=30401 X 55.56=1689(KW)

The percentage of power converted to savings can be expressed as: 1689/8000=21.1%

Industrial electricity is 1 yuan / kWh (kWh), which is equivalent to saving 1689 degrees per hour and saving electricity costs 1689 yuan. If you calculate the daily train for 12 hours, you can save 20,268 degrees per day, save 7.4 million kWh per year, and save 7.4 million yuan in electricity.

Different from the above embodiment, in another embodiment, assuming that the average train speed is 100 km/h (27.78 m/s, regardless of wind speed), the entire group of 15 cars, with a total length of 396 m, can be installed with 100 wings, total wings. The area is 5 X 100=500 m ² , then, when using the 9 degree angle of attack, according to the calculation formula of the above upgrade and resistance:

L=l/2pV ² S CL=368,346(N)

D= 1/2 p V ² S CD=19,912(N)

The weight of each wing is approximately 50kg, and the total weight of wings W can be expressed as:

W= ( 50 X 100) *g=5,000*9.8=49,000(N) Then, the effect of the "lifting weight" of the EMU by installing the wings can be expressed in the following ways:

Converted to saved traction F can be expressed as:

F= (L-W) μ-ϋ=12,023(Ν)

Converted to saved traction power Ρ can be expressed as:

P=FV=12023 X 27.78=334(KW),

It is equivalent to saving 334 degrees per hour and saving electricity costs by 334 yuan. If you calculate by electric train for 12 hours per day, you can save 4008 degrees per day, save electricity by 4008 yuan, save 1.46 million electricity per year, and save electricity costs by 1.46 million yuan.

Different from the above embodiment, in another embodiment, assuming that the freight train has a speed of 100 kilometers per hour (excluding the wind speed), there are 60 cars, each car has a length of 14 meters, and the total length of the list is 840 meters. About 200 wings can be installed. Each wing has an area of 3X2=6m ² and a total wing area of 1200m ² . Then, when using the 9 degree angle of attack, according to the calculation formula of the above upgrade and resistance, you can get:

L=l/2 V ² S CL=884,030(N)

D= 1/2 p V ² S Cd=47,789(N)

The weight of each wing is approximately 50kg, and the total wing weight W can be expressed as:

W= (50X200) *g=10,000*9.8=98,000(N)

Converted to saved traction F can be expressed as:

F= (L-W) μ-ϋ=30,814 (Ν)

Converted to saved traction power Ρ can be expressed as:

P=FV=30814 X 27.78=856(KW),

It is equivalent to saving 856 degrees per hour and saving 856 yuan. If you calculate 12 hours per day by train, you can save 10,272 yuan per day and save electricity by 10,272 yuan. You can save 3.75 million yuan per year and save electricity costs by 3.75 million yuan.

Different from the above embodiment, in another embodiment, it is assumed that the freight truck has a speed of 80. km / Hours (22.22m/s, excluding wind speed), the body length, width and height are 12.0 meters, 2.49 meters, 3.86 meters, and can be installed with 3 4 m ² ( 2X2 ) wings with a total wing area of 12 m ² . The friction coefficient of the normal dry asphalt pavement is μ=0.6. Then, when using the 9 degree angle of attack, according to the calculation formula of the above upgrade and resistance, you can get:

L = l/2 p V ² S CL=5,656(N)

D= 1/2 p V ² S Cd=305.7(N)

The mass of each superbow is about 50kg, and the total weight of wings W can be expressed as:

W= ( 50 X 3 ) *g=150*9.8=l,470(N)

The converted traction power P can be expressed as:

Then, the EMU "weight reduction" effect achieved by installing the wings can be expressed in the following ways:

Converted to saved traction F can be expressed as:

F= ( L-W ) μ - D=2206(N)

The converted traction power P can be expressed as - P = FV = 2206 X 22.22 = 49 (KW),

According to the power consumption calculation, it is equivalent to saving 49 degrees per hour and saving electricity costs 49 yuan. If you calculate the daily freight truck for 12 hours per day, you can save 588 degrees per day, save 588 yuan for electricity, and save 215,000 yuan per year. Yuanyuan, saving electricity costs of 215,000 yuan, the cost of electricity consumption calculation is only a conservative estimate, because in practice, the cost of gasoline and diesel is much higher than the cost of the same power.

Based on the above embodiments, referring to FIG. 5, in order to enable the wings mounted on the various transportation vehicles to better perform their functions, a control device may be installed in the transportation vehicle, connected to the anemometer, and the wind speed is sensed. The change can automatically adjust the angle of the wings. For example, when a transportation vehicle is driving at a low speed, the wings are leveled to reduce the resistance, and when the speed of the transportation vehicle reaches a set threshold, for example, the train speed reaches 70 km/h, the wings are expanded to 9 degrees. Angle of attack.

As shown in FIG. 5, the above control device includes a guide rail, an adjustment motor (also referred to simply as a motor), and a crank link, wherein a guide rail disposed at the top of the transportation vehicle;

The motor is adjusted, disposed in the guide rail, and connected to one end of the wing through a crank link for driving the wing through the crank link to adjust the angle of attack.

In the above embodiment, the wings are also required to be connected to the top of the transportation vehicle through the fixed rod to facilitate the control device to control it.

On the other hand, referring to FIG. 6, when the transportation vehicle brakes, the control device can also change the angle of attack of the wing to an angle of minus 9 degrees or more according to the braking signal, which is specifically described as follows: The angle of the car body is [9, 90] degrees, which will increase the resistance of the transportation vehicle when traveling, thus reducing the braking distance to reduce the risk factor in emergency situations. On the other hand, it can also reduce the wear of the vehicle caused by the brake system and prolong the service life of the brake system. Without departing from the spirit and scope of the invention. Thus, the present embodiments of the invention are intended to cover such modifications and modifications as the modifications and variations of the embodiments of the present invention.

Claims

Rights request

What is claimed is: 1. A power assist device for a transportation vehicle, comprising: a set of power assisting baffles, each of the power assisting baffles being disposed at a top of the transportation vehicle and forming a body along the direction of travel of the vehicle An angle of attack of [0, 9] degrees.

1. The power assist device according to claim 1, wherein the angle of attack is 9 degrees.

The power assisting device according to claim 1, wherein a shape of the side of the power-assisting baffle near the top of the car is flat, and a shape of the side away from the top of the car is convex, and the aspect ratio of the baffle is smaller than Set the threshold.

4. The power assist device according to claim 1, 2 or 3, wherein the booster baffle is made of an aluminum alloy.

5. A transportation vehicle, comprising: a set of power-assisting baffles disposed at a top of the transportation vehicle, each of the power-assist baffles forming a body along the vehicle traveling direction as the vehicle travels [0, 9] degree of attack angle.

6. The transportation vehicle of claim 5, wherein each of the booster baffles is fixedly coupled to the top of the transportation vehicle, the angle of attack being [0, 9] degrees.

7. The transportation vehicle according to claim 5, further comprising: a control device, wherein: each of the booster baffles is movably connected to a top of the transportation vehicle, and the other end is connected to the control device The control device is configured to adjust the angle of attack to [0, 9] degrees when the traveling speed of the transportation vehicle is above a set threshold.

8. The transportation vehicle according to claim 7, wherein the control device is further configured to adjust an angle of an angle of attack of each of the booster baffles to travel along the vehicle according to a braking signal of the transportation vehicle. The opposite direction is [9, 90] degrees above the top of the vehicle.

9. The transportation vehicle of claim 7 or 8, wherein the control device comprises:

a guide rail disposed at the top of the transportation vehicle;

Adjust the motor, set in the guide rail, and connect with one end of the booster baffle through the crank link The power assisting baffle is driven by the crank link to adjust the angle of attack.

The transportation vehicle according to any one of claims 5 to 8, wherein a side of the auxiliary baffle near the top of the compartment is flat, and a side away from the top of the compartment is convex. The board's aspect ratio is less than the set threshold.