KR102374071B1 - Electric vehicle installed high efficiency generator - Google Patents

Abstract

The present invention relates to a four wheel steering-available electric vehicle, which can increase power efficiency by having a high-efficient generator mounted therein. According to an embodiment of the present specification, an electric vehicle comprises: an electric motor for driving front wheels; a battery for storing electric energy for driving the electric motor; a generator for converting the rotational energy of rear wheels into electric energy and supplying the electric energy to the battery or the electric motor; a flywheel connected to the rear wheels by a first pulley and connected to the generator by a second pulley; and a controller for monitoring and controlling the charge/discharge state of the battery, monitoring the required power of the electric motor, and performing control so that the battery is charged with the electric energy generated by the generator, or the electric energy is directly supplied to the electric motor. The rear wheels and the flywheel have substantially the same gear ratio and are connected by the first pulley. The flywheel has a higher gear ratio than the generator, and the flywheel and the generator are connected by the second pulley.

Description

Electric vehicle capable of four-wheel steering equipped with a high-efficiency generator {ELECTRIC VEHICLE INSTALLED HIGH EFFICIENCY GENERATOR}

The present invention relates to an electric vehicle driven by a battery and an electric motor, and more particularly, to an electric vehicle capable of four-wheel steering and having improved power efficiency by mounting a high-efficiency generator.

An electric vehicle is a vehicle that drives a vehicle by rotating a motor with electric energy accumulated in a battery.

Such electric vehicles are subdivided into battery electric vehicles (BEVs), plug-in hybrids (PHEVs), and mileage extension vehicles (eREVs). A battery electric vehicle (BEV) uses a motor as a driving source and only a battery as an energy source to drive the vehicle. However, it takes a lot of time to charge the battery, and the battery capacity is still insufficient to keep up with the internal combustion engine, so there is a problem in that the mileage is short.

Hybrid (HEV) and plug-in hybrid (PHEV) use an engine as a main driving source and a motor as a secondary driving means to selectively use an internal combustion engine and an electric motor. A plug-in hybrid is a vehicle capable of charging a battery. However, since an internal combustion engine is used as a main driving means, there is a problem in that pollution such as exhaust gas is still generated.

Although such electric vehicles have had difficulties in disseminating technology due to problems such as long charging times and short driving distances, they are gradually becoming more popular due to strengthening environmental regulations, support from governments in each country, and falling battery prices. However, currently commercialized electric vehicles have a problem in that there is a limit to increasing the electric energy efficiency because the energy charging efficiency of the battery is not high.

An object of the present invention is to provide an electric vehicle that maximizes energy efficiency by using a high-efficiency generator.

An object of the present invention is to provide an electric vehicle using a high-efficiency generator capable of four-wheel steering.

However, the object of the present invention is not limited to the above, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

An electric vehicle capable of four-wheel steering according to an embodiment of the present specification includes an electric motor for driving a front wheel; a battery storing electric energy for driving the electric motor; a generator converting the rotational energy of the rear wheel into electric energy and supplying electric energy to the battery or the electric motor; a flywheel connected to the rear wheel wheel and a first pulley, and connected to the generator and a second pulley; and a controller that monitors and controls the charging/discharging state of the battery, and controls the electric energy generated by the generator to be charged to the battery or directly supplied to the electric motor by monitoring the required power of the electric motor, wherein the rear wheel wheel And the flywheel is configured to have substantially the same gear ratio and is connected to the first pulley, and the flywheel and the generator are configured to have a higher gear ratio of the flywheel and are connected to the second pulley.

Preferably, the controller operates the battery in a discharging mode from a vehicle stop state to a predetermined speed or less to supply the charged electric energy to the electric motor. It characterized in that the control to operate the battery in the charging mode so that the electric energy generated by the generator is charged to the battery through the.

Also, preferably, the controller monitors the driving state of the vehicle and, when the electric energy required by the electric motor is greater than or equal to a predetermined range, calculates the electric energy charged in the battery and the electric energy generated by the generator to calculate the electric energy of the electric motor. It is characterized in that by distributing the amount of electrical energy required in the battery and the generator, respectively, to control to supply the electrical energy to the electric motor from the battery and the generator at the same time.

According to an embodiment of the present invention, an electric vehicle maximizing energy efficiency can be provided by using a high-efficiency generator to continuously maintain the rotational force of the rear wheel while charging it with electric energy or using it as energy for driving the front wheel there is

In addition, the present invention has the advantage of being able to steer at a desired angle even in a small area by proposing an electric vehicle capable of four-wheel steering using a steering shaft and a steering guide bar.

1 and 2 are diagrams schematically showing the structure of an electric vehicle according to an embodiment of the present invention.
3 is a diagram schematically showing the structure of an electric bike according to an embodiment of the present invention.
4 is a block diagram schematically showing the configuration of an electric vehicle equipped with a high-efficiency generator according to an embodiment of the present invention.
5 is a reference diagram schematically illustrating a connection relationship between a generator and a rear wheel according to an embodiment of the present invention.
6 and 7 are diagrams for explaining an energy charging mode in an electric vehicle equipped with a high-efficiency generator according to an embodiment of the present invention.
8 is a view for explaining an energy discharge mode in an electric vehicle equipped with a high-efficiency generator according to an embodiment of the present invention.
9 illustrates an electric vehicle capable of four-wheel steering according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in adding reference numerals to the components of each drawing, the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, preferred embodiments of the present invention will be described below, but the technical spirit of the present invention is not limited thereto and may be variously implemented by those skilled in the art without being limited thereto.

1 and 2 are diagrams schematically showing the structure of an electric vehicle according to an embodiment of the present invention.

The electric vehicle according to an embodiment of the present invention is a two-wheeled, three-wheeled, or four-wheeled bike or electric vehicle, and any means of movement that is driven by electric energy as a main power source or an auxiliary power source may be applied. Accordingly, battery electric vehicles (BEVs) and extended range vehicles (eREVs) may be included as well as hybrids (HEVs) and plug-in hybrids (PHEVs).

1 illustrates a representative four-wheeled electric vehicle by way of example, and an electric motor 10 for driving a front wheel (FW), a rear wheel (BW), a front wheel (FW) and/or a rear wheel (BW), the electric motor It includes a battery 20 that is charged and discharged with electric energy for driving, a generator 30 that converts rotational energy into electric energy, and a controller 50 . The generator 30 may be mounted on the rear wheel, the front wheel, or the center of the vehicle, but it is preferably mounted on the rear wheel (BW) portion as shown so that it can be easily interlocked with the rear wheel. An auxiliary wheel or a flywheel (not shown) is configured inside the generator 30 and is connected to the rear wheel through the flywheel, thereby converting the rotational energy of the rear wheel into electrical energy.

FIG. 2 shows a typical two-wheeled electric vehicle by way of example, and the electric motor 10 is installed on the front wheel FW and driven by the front wheel, and the rear wheel BW is connected to the generator 30 through the flywheel. The rotational energy of the rear wheel is converted into electrical energy.

3 is a diagram schematically showing the structure of an electric motorcycle according to an embodiment of the present invention.

In the present embodiment, an electric motorcycle is described as an example, but the present invention is not limited to the electric motorcycle. The electric motorcycle according to the present embodiment may be a two-wheeled or three-wheeled or more multi-wheeled motorcycle.

The electric motorcycle according to the present embodiment has a rechargeable battery 20 like a general electric motorcycle. Since this battery 20 is substantially the same as a generally used battery, a description thereof will be omitted herein.

Such a battery 20 can be easily charged using 220V power used in a general household, and has the advantage of being charged using late-night electricity, which is relatively inexpensive, and used during the day. Also, if there is a better battery than a normal battery, you can use that battery. Therefore, the motorcycle according to the present embodiment is characterized in that the energy use efficiency is high while using the same battery.

Next, the arrangement structure of the wheels, the coupling structure with the body, the steering system, the shock absorption system, etc. are substantially the same as those of a general electric motorcycle, and thus will not be described herein. However, when the electric motorcycle according to the present embodiment is a two-wheeled motorcycle, all wheels may be configured as independent driving wheels independently driven. Therefore, both the front wheel FW and the rear wheel BW are provided as independent driving wheels, and they may be driven by separate driving means. When the front wheel (FW) and the rear wheel (BW) are driven independently in this way, the force is dispersed and the overall energy consumption can be reduced.

In addition, in this embodiment, since the front wheel (FW) and the rear wheel (BW) are driven independently, there is a possibility that a difference may occur in the rotation speed of the front wheel and the rear wheel, so the rotation speed for synchronizing the rotation speed of the front wheel (FW) and the rear wheel (BW) A synchronization system may further be provided.

Meanwhile, when the electric motorcycle according to the present embodiment is a three-wheeled motorcycle or a four-wheeled motorcycle, two or more wheels are provided as independent driving wheels among all wheels. Of course, the entire wheel may be provided as an independent driving wheel. In this case, rotation speed synchronization means for synchronizing the rotation speed of each independent driving wheel may be further provided.

Hereinafter, for convenience of description, it is assumed that the vehicle is driven by the front wheel (FW).

The electric motor 10 is installed on the front wheel FW and receives electric energy from the battery 20 and/or the generator 30 to drive the front wheel FW.

The generator 30 converts the rotational energy of the rear wheel BW into electric energy and supplies the electric energy to the battery 20 or the electric motor 10 .

The flywheel 40 is connected to the rear wheel BW and a first pulley, and is connected to the generator 30 by a second pulley, and converts the rotational force of the rear wheel BW into electrical energy.

The controller 50 monitors and controls the charging/discharging state of the battery 20 , and by monitoring the required power of the electric motor 10 , the electric energy generated by the generator 30 is charged into the battery 20 or the electric motor 10 . control to be supplied directly to At this time, the rear wheel (BW) and the flywheel 40 are configured with substantially the same gear ratio and are connected to the first pulley, and the flywheel 40 and the generator 30 are configured to have a higher gear ratio of the flywheel and are connected to the second pulley. can

4 is a block diagram schematically illustrating the configuration of an electric vehicle equipped with a high-efficiency generator according to an embodiment of the present invention.

The electric motor 10 is connected to the front wheel FW through the reduction gear 70 and corresponds to a driving motor for driving the front wheel FW. At this time, when the motor is directly connected to the front wheel (FW), which is a rotating body, the force generated while the rotating body rotates is transmitted to the motor, thereby shortening the life of the motor or causing abrasion, thereby causing damage to the motor. Accordingly, by connecting the electric motor 10 as a driving motor and the front wheel FW as a rotating body through the reducer 70 , it is possible to protect the electric motor 10 . In addition, when the number of revolutions is reduced in a state where the power of the electric motor 10 is constant, the torque increases. The reducer 70 reduces the operating speed of the electric motor 10 to apply greater force to the front wheel FW as a rotating body. be able to transmit

The generator 30 converts the rotational energy of the rear wheel BW into electrical energy, and as illustrated, the generated electrical energy can be charged into the battery 20 or directly supplied to the electric motor 10 . At this time, in order to increase the efficiency of the generator 30 , the generator 30 and the rear wheel BW are connected through the flywheel 40 .

The flywheel 40 is a means of maximizing the generation of centrifugal force as a heavy-duty rotating body, and it is connected to the rear wheel (BW) by a pulley and rotates together while synchronizing, but the size of the centrifugal force due to its own weight increases, so that the rotational force is doubled. can That is, the flywheel 40 is a high-weight rotating body and is configured to increase the moment of inertia, and while receiving the rotational force of the rear wheel (BW), a large centrifugal force is generated through the moment of inertia of the flywheel 40 to generate rotational energy loss can be minimized or increased. Therefore, since the rotational energy generated from the rear wheel BW is transmitted to the generator 30 through the flywheel 40, it is larger than the generator 30 while preventing a decrease in rotational energy due to a change in vehicle speed or an increase in load. electrical energy can be generated.

At this time, according to an embodiment of the present invention, the rear wheel BW and the flywheel 40 have substantially the same gear ratio and are connected to the first pulley so that the rear wheel BW acts as a load in a state in which rotational force is generated to some extent. to minimize or prevent the flywheel 40 from being over-rotated.

In addition, it is preferable that the flywheel 40 and the generator 30 have a higher gear ratio of the flywheel and are connected to the second pulley so that the rotational energy transmitted to the rotational shaft of the generator 30 can be doubled.

5 is a reference diagram schematically illustrating a connection relationship between a generator and a rear wheel according to an embodiment of the present invention.

As shown, the rear wheel (BW) and the flywheel 40 may be connected to the first pulley 81 at the same gear ratio, and the flywheel 40 and the generator 30 have a higher gear ratio of the flywheel 40. to be connected to the second pulley 82 .

According to an embodiment of the present invention, the gear ratio of the rear wheel BW and the flywheel 40 is approximately 1:1, and the gear ratio of the flywheel 40 and the generator 30 is approximately 2:1. That is, the overall gear ratio of the rear wheel BW, the flywheel 40 and the generator 30 may be approximately 2:2:1. By having such a gear ratio, it is possible to maximize the rotational force generated from the rear wheel while maximizing the rotational force generated from the rear wheel and maintain the rotational force through the flywheel 40 as much as possible through the flywheel 40 and transmit it to the generator 30, through this (30) makes it possible to generate high-efficiency electric energy by utilizing the maximized rotational energy.

On the other hand, according to an embodiment of the present invention, the generator 30 has a capacity of 1KW, it is possible to use a product of a standard having a rotational capacity of up to 3,600rpm.

6 and 7 are diagrams for explaining an energy charging mode in an electric vehicle equipped with a high-efficiency generator according to an embodiment of the present invention.

The embodiment of FIG. 6 is an embodiment in which the electric motor 10 is installed on the front wheel shaft, and the embodiment of FIG. 7 shows an embodiment in which the electric motor 10 is installed in the front wheel FW in the form of an In-Wheel. .

Since the rotational force of the rear wheels BW is not sufficient from the stationary state of the vehicle to below a predetermined speed, the controller 50 transfers the electric energy charged in the battery 20 to the electric motor 10 to drive the vehicle.

On the other hand, when the rotational force of the rear wheel (BW) exceeds the predetermined speed and meets the minimum requirement for generating electrical energy, the rotational force of the rear wheel (BW) is transmitted to the generator 30 through the flywheel 40 The generator 30 converts rotational energy into electrical energy, and the controller 50 operates the battery in a charging mode so that the electrical energy generated by the generator 30 is charged into the battery 20 .

On the other hand, the in-wheel motor shown in FIG. 7 is a system in which a driving motor, a brake, and a suspension are integrated and attached to a vehicle wheel, and has the advantage of independently controlling each wheel according to the driving state of the vehicle.

6 and 7, the rotational energy generated from the rear wheel BW is converted into electric energy in the generator 30 through the flywheel 40, and then is charged into a battery.

8 is a view for explaining an energy discharge mode in an electric vehicle equipped with a high-efficiency generator according to an embodiment of the present invention.

The controller 50 periodically calculates the electric energy Pt required by the electric motor 10 by monitoring the driving state of the vehicle. That is, if the electric energy Pt for driving the vehicle is within the power range P2 that can be supplied from the battery, the electric energy charged in the battery 20 is controlled to be provided to the electric motor 10 .

However, when the electric energy Pt required by the electric motor 10 is greater than or equal to a predetermined range, the electric energy charged in the battery 20 and the electric energy generated by the generator 30 are calculated and requested by the electric motor 10 . The amount of electric energy Pt used is controlled to be distributed to the battery and the generator, respectively, and the electric energy is supplied to the electric motor 10 from the battery P2 and the generator P1 at the same time.

As described above, when controlling to supply energy from the battery 20 and the generator 30 at the same time, for example, when an uphill road or rapid acceleration is required, the electric motor 10 instantaneously requires a lot of electrical energy, and this In the same case, not only the energy charged in the battery 20 but also the energy generated by the generator 30 can be simultaneously supplied to the electric motor, so that the driving output of the vehicle can be prevented from being lowered.

9 illustrates an electric vehicle capable of four-wheel steering according to an embodiment of the present invention. Hereinafter, an electric vehicle capable of four-wheel steering according to an embodiment of the present invention will be described in detail with reference to FIG. 9 .

Referring to FIG. 9 , an electric vehicle capable of four-wheel steering includes a first axle, a first steering shaft, a second axle, a second steering shaft, and a steering guide bar. Of course, other configurations other than the above-described configuration may be included in the electric vehicle capable of four-wheel steering proposed by the present invention.

The first axle 902 is located at the front end of the electric vehicle, and the two front wheels located at the front end are fastened thereto. A first front wheel is indirectly fastened to one end of the first axle 902 , and a second front wheel is indirectly fastened to the other end of the first axle 902 . The first steering shaft 906 is connected to the first axle 902 using connecting members 912 and 914 . One end of the first steering shaft 906 is hinge-connected to one end of the first connecting member 912 , and a bending point of the first connecting member 912 is hinge-connected to one end of the first axle 902 . The other end of the first connecting member 912 is connected to one end of the first axle 902 and at the same time the first front wheel is fastened. The other end of the first steering shaft 906 is hingedly connected to one end of the second connecting member 914 , and a bending point of the second connecting member 914 is hingedly connected to the other end of the first axle 902 . The other end of the second connecting member 914 is connected to the other end of the first axle 902 and at the same time the second front wheel is fastened. As shown in FIG. 9 , the first front wheel and the second front wheel are steered by the left and right movement of the first steering shaft 906 .

In detail, the connecting member is formed at a bending point bent at a certain angle, and is hinge-coupled to the own shaft at the bending point, and the other end of the connecting member is fastened to the front wheel.

The second axle 904 is located at the rear end of the electric vehicle, and two rear wheels located at the rear end are fastened thereto. The first rear wheel is indirectly fastened to one end of the second axle 904 , and the second rear wheel is indirectly fastened to the other end of the second axle 904 . The second steering shaft 908 is connected to the second axle 904 using connecting members 9016 and 918 . One end of the second steering shaft 908 is hinge-connected to one end of the third connecting member 916 , and a bending point of the third connecting member 916 is hinge-connected to one end of the second axle 904 . The other end of the third connecting member 916 is connected to one end of the second axle 904 and is coupled to the first rear wheel. The other end of the second steering shaft 908 is hinge-connected to one end of the fourth connecting member 918 , and a bending point of the fourth connecting member 918 is hinge-connected to the other end of the second axle 904 . The other end of the fourth connecting member 918 is connected to the other end of the second axle 904 and is coupled to the second rear wheel.

The steering guide bar 910 is fastened to the first steering shaft 906 and the second steering shaft 908 . One end of the steering guide bar 910 is fastened to the first steering shaft 906 , and the other end of the steering guide bar 910 is fastened to the second steering shaft 908 . In particular, the steering guide bar 910 is fastened to a left point with respect to the central point on the first steering shaft 906 and is fastened to a right point based on the central point on the second steering shaft 908 .

Accordingly, the first steering shaft 906 moves to the left and the second steering shaft 908 moves to the right by the counterclockwise rotation of the steering guide bar 910 . In addition, the first steering shaft 906 moves to the right and the second steering shaft 908 moves to the left by the clockwise rotation of the steering guide bar 910 . As described above, the present invention proposes an electric vehicle capable of four-wheel steering using a steering shaft and a steering guide bar.

Even though all the components constituting the embodiment of the present invention described above are described as being combined or operated in combination, the present invention is not necessarily limited to this embodiment. That is, within the scope of the object of the present invention, all the components may operate by selectively combining one or more. In addition, all of the components may be implemented as one independent hardware, but a part or all of each component is selectively combined to perform some or all of the functions combined in one or a plurality of hardware program modules It may be implemented as a computer program having In addition, such a computer program is stored in a computer readable media such as a USB memory, a CD disk, a flash memory, etc., read and executed by a computer, thereby implementing an embodiment of the present invention. The computer program recording medium may include a magnetic recording medium, an optical recording medium, a carrier wave medium, and the like.

In addition, all terms including technical or scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined in the detailed description. Terms commonly used, such as those defined in the dictionary, should be interpreted as being consistent with the contextual meaning of the related art, and are not interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains may make various modifications, changes and substitutions within the scope without departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are for explaining, not limiting, the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments and the accompanying drawings . The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

10: electric motor 10: battery
30: generator 40: flywheel
50: controller 60: inverter
70: reducer 81: first pulley
82: second pulley 902: first axle
904: second axle 906: first steering axle
908: second steering shaft 910: steering guide bar

Claims (7)

In an electric vehicle having a front wheel and a rear wheel,
an electric motor driving the front wheel;
a battery storing electric energy for driving the electric motor;
a generator converting the rotational energy of the rear wheel into electric energy and supplying electric energy to the battery or the electric motor;
a flywheel connected to the rear wheel wheel and a first pulley, and connected to the generator and a second pulley; and
and a controller for controlling the charging/discharging state of the battery and controlling the electric energy generated by the generator to be charged to the battery or directly supplied to the electric motor by monitoring the required power of the electric motor,
The rear wheel and the flywheel are configured to have substantially the same gear ratio and are connected to the first pulley, and the flywheel and the generator are configured to have a higher gear ratio of the flywheel and are connected to the second pulley. An electric vehicle equipped with a high-efficiency generator capable of steering.
According to claim 1, wherein the controller,
From the stationary state of the vehicle to below a predetermined speed, the battery is operated in a discharging mode to control the charged electric energy to be supplied to the electric motor,
When the predetermined speed is exceeded, a high-efficiency generator capable of four-wheel steering is mounted, characterized in that the battery is controlled to operate in a charging mode so that the electric energy generated by the generator is charged to the battery through the rotational force of the rear wheel. old electric vehicle.
According to claim 1, wherein the controller,
When the electric energy required by the electric motor is greater than or equal to a predetermined range by monitoring the driving state of the vehicle, the electric energy charged in the battery and the electric energy generated by the generator are calculated to determine the amount of electric energy required by the electric motor, respectively. An electric vehicle equipped with a high-efficiency generator capable of four-wheel steering, characterized in that it is controlled to supply electric energy from the battery and the generator to the electric motor at the same time by distributing it to the battery and the generator.
According to claim 1,
The gear ratio of the rear wheel and the flywheel is approximately 1:1,
An electric vehicle equipped with a high-efficiency generator capable of four-wheel steering, characterized in that the gear ratio between the flywheel and the generator is approximately 2:1.
The electric vehicle of claim 1, wherein the electric motor is an in-wheel motor included in the front wheel.
The method of claim 1,
The front wheel includes a first front wheel and a second front wheel,
The rear wheel includes a first rear wheel and a second rear wheel,
The first front wheel is connected to the other end of the first connecting member having a bending point bent between one end and the other end,
The bending point of the first connecting member is hingedly fastened with one end of the first axle, and one end of the first connecting member is hingedly fastened with one end of the first steering shaft,
The second front wheel is connected to the other end of the second connecting member having a bending point bent between one end and the other end,
The bending point of the second connecting member is hingedly fastened to the other end of the first axle, and one end of the second connecting member is hingedly fastened to the other end of the first steering shaft,
The first rear wheel is connected to the other end of the second connecting member having a bending point bent between one end and the other end,
The bending point of the third connecting member is hinged with one end of the second axle, and one end of the third connecting member is hinged with one end of the second steering shaft,
The second rear wheel is connected to the other end of the fourth connecting member having a bending point bent between one end and the other end,
An electric vehicle equipped with a high-efficiency generator capable of four-wheel steering, characterized in that the bending point of the fourth connecting member is hinged to the other end of the second axle, and one end of the fourth connecting member is hinged to the other end of the second steering shaft.
7. The method of claim 6,
One end is fastened at a point on the left side of the center point of the first steering shaft,
An electric vehicle equipped with a high-efficiency generator capable of four-wheel steering, characterized in that it includes a steering guide bar to which the other end is fastened at a point on the right side of the second steering shaft based on the central point.

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