KR101474400B1 - Apparatus and method for driving vehicle using plural batteries - Google Patents

Abstract

The present invention discloses a vehicle driving apparatus and method using a plurality of batteries that can increase the use time of a battery while enhancing vehicle performance by allowing a battery having an appropriate output and capacity to be used according to the driving situation of the vehicle. A vehicle driving apparatus according to the present invention drives a vehicle using a plurality of batteries, comprising: a first battery; a second battery having a lower output and higher capacity than the first battery; An acceleration measuring unit for measuring a speed change amount per hour of the vehicle; A driving motor for receiving the electric power from the first battery or the second battery and driving the vehicle; A switching unit selectively switching a power supply path from the first battery or the second battery to the driving motor; And a control unit for controlling the switching unit to supply power from the first battery to the driving motor when the measured value of the rate of change per unit time is equal to or greater than a reference value by comparing the rate of change per unit of time measured by the acceleration measuring unit with a reference value, And a control unit for controlling the switching unit so that power is supplied from the second battery to the driving motor when the measured value of the speed change amount is less than the reference value.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vehicle driving apparatus and method using a plurality of batteries,

The present invention relates to an apparatus and method for driving a vehicle, and more particularly, to an apparatus and method for efficiently driving an electric vehicle using two or more batteries having different performances.

In recent years, demand for portable electronic products such as notebook computers, video cameras, and portable telephones has been rapidly increased, and development of batteries, robots, and satellites for energy storage has been accelerated. Thus, a high performance rechargeable battery Researches are being actively conducted.

The secondary rechargeable batteries are nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries have almost no memory effect compared to nickel- It is very popular because of its low self-discharge rate and high energy density.

On the other hand, as carbon energy is gradually depleted and the interest in the environment is increasing, demand for hybrid cars and electric vehicles is gradually increasing worldwide, including the United States, Europe, Japan, and Korea. Since such hybrid vehicles and electric vehicles use the charge / discharge energy of the battery pack to obtain the vehicle driving power, they are more fuel-efficient than the vehicles using only the engine and can not discharge or reduce pollutants. . Therefore, more attention and research are focused on automotive batteries, which are key components of hybrid cars and electric vehicles.

2. Description of the Related Art [0002] Electric vehicles including hybrid electric vehicles currently employ lithium secondary batteries as batteries for supplying vehicle driving power. The power and capacity of a lithium secondary battery may vary depending on the size, material, structure, etc. Generally, an electric vehicle uses one type of battery. For example, in a hybrid vehicle that uses an engine and a motor together, a high-output battery that focuses on output rather than capacity is used. In a pure electric vehicle using only a motor, the output is important. A high capacity battery is adopted.

However, the electric power of the battery may vary depending on the situation of the electric vehicle. In particular, the vehicle may or may not require a high battery output during driving. For example, when starting or accelerating the vehicle requires a high battery output, while at constant speed the vehicle requires a very low battery output.

However, according to the related art, since only one kind of battery is mounted in one electric vehicle, there is a problem that the output demand situation of such a vehicle can not be reflected. Therefore, when the battery having the output performance matching the highest battery output requirement is used, the capacity of the battery may be lowered. Conversely, if you use a battery with a somewhat lower battery output capability, you may not be able to supply an appropriate amount of battery output in situations that require high battery output.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and it is an object of the present invention to provide a vehicle control apparatus and a vehicle control method capable of using a battery having an appropriate output and capacity according to a running condition of a vehicle, It is an object of the present invention to provide a vehicle driving apparatus and method using a battery.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to an aspect of the present invention, there is provided an apparatus for driving a vehicle using a plurality of batteries, the apparatus comprising: a first battery; a second battery having a lower output and a higher capacity than the first battery; An acceleration measuring unit for measuring a speed change amount per hour of the vehicle; A driving motor for receiving the electric power from the first battery or the second battery and driving the vehicle; A switching unit selectively switching a power supply path from the first battery or the second battery to the driving motor; And a control unit for controlling the switching unit to supply power from the first battery to the driving motor when the measured value of the rate of change per unit time is equal to or greater than a reference value by comparing the rate of change per unit of time measured by the acceleration measuring unit with a reference value, And a control unit for controlling the switching unit so that power is supplied from the second battery to the driving motor when the measured value of the speed change amount is less than the reference value.

Preferably, the acceleration measuring unit measures a speed change amount per hour of the vehicle on the basis of an acceleration request by a user.

Further, preferably, the acceleration measuring unit measures the actual speed of the vehicle and measures the speed change amount per hour of the vehicle.

According to another aspect of the present invention, there is provided a vehicle including the above vehicle driving apparatus.

According to another aspect of the present invention, there is provided a method for driving a vehicle, the method comprising: supplying power to a driving motor of the vehicle using a first battery and a second battery having a lower output and a higher capacity than the first battery, A method of driving, comprising: measuring an acceleration of the vehicle; Comparing the measured acceleration of the vehicle with a reference value; And controlling the switching unit to supply power from the first battery to the driving motor when the acceleration is equal to or greater than the reference value and to control the switching unit to supply power from the second battery to the driving motor when the acceleration is less than the reference value .

Preferably, the acceleration of the vehicle is measured based on an acceleration request by a user.

Also preferably, the acceleration of the vehicle is measured based on the actual speed of the vehicle.

According to the present invention, batteries having different capacities and outputs can be mounted on one electric vehicle, so that an appropriate battery can be used according to the battery output requirement situation required by the vehicle.

For example, in a situation where a high battery output is required, such as a vehicle start or acceleration, a high output battery can be used and an appropriate battery output can be supplied to enhance the performance of the vehicle. In addition, in a situation where a battery output that is not high such as a constant speed running is required, a high capacity battery is used so that unnecessary excess battery output is not supplied as compared with a required output of the vehicle, thereby preventing the capacity of the battery from being lowered.

Therefore, according to the present invention, the performance of the electric vehicle and the capacity of the battery can be improved by allowing the battery to be efficiently used.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given above, serve to further the understanding of the technical idea of the invention, And should not be construed as limiting.
1 is a block diagram schematically showing a functional configuration of a vehicle drive apparatus according to an embodiment of the present invention.
2 is a view schematically showing a connection structure of a vehicle drive system according to an embodiment of the present invention.
3 is a view schematically showing a configuration in which the angle of the accelerator pedal is changed when the accelerator pedal of the vehicle is depressed by the user.
4 is a view schematically showing a connection structure of a vehicle drive system according to another embodiment of the present invention.
Fig. 5 is a diagram showing a battery determined to supply driving power according to the acceleration of the vehicle by the control unit in the embodiment of Fig. 4; Fig.
6 is a flowchart schematically showing a vehicle driving method using a plurality of batteries according to an embodiment of the present invention.
7 is a flowchart schematically showing a vehicle driving method according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

FIG. 1 is a block diagram schematically showing a functional configuration of a vehicle driving apparatus according to an embodiment of the present invention, and FIG. 2 is a view schematically showing a connection configuration of a vehicle driving apparatus according to an embodiment of the present invention .

The vehicle driving apparatus according to the present invention can be used as an apparatus for driving an electric vehicle mounted on an electric vehicle. Here, the electric vehicle may include not only a pure electric vehicle driven by a motor but also a hybrid vehicle driven by using a motor and an engine together.

1 and 2, a vehicle driving apparatus according to the present invention includes a first battery 110, a second battery 120, an acceleration measuring unit 200, a driving motor 300, a switching unit 400, And a control unit 500.

The first battery 110 and the second battery 120 are batteries having different capacities and outputs. More specifically, the first battery 110 is a battery having a higher output than the second battery 120, and the second battery 120 is a battery having a capacity higher than that of the first battery 110.

Particularly, the first battery 110 may be a high output battery widely used in a hybrid vehicle, and the second battery 120 may be a high capacity battery widely used in pure electric vehicles. However, the term "high power" or "high capacity" is a relative concept, and does not necessarily mean that it should have an output or capacity exceeding a specific value.

In the present invention, such a high output battery (the first battery 110) and a high capacity battery (the second battery 120) are both mounted in one electric vehicle.

The acceleration measuring unit 200 can measure the acceleration of the vehicle, that is, the speed change amount per hour of the vehicle.

Here, the speed change amount per hour of the vehicle may be based on the acceleration request by the user. That is, the acceleration measuring unit 200 can measure the acceleration of the vehicle according to an acceleration request by the user, rather than the actual acceleration of the vehicle.

In this case, the acceleration measuring unit 200 can measure the acceleration of the vehicle in accordance with the degree of depression of the accelerator pedal provided in the vehicle. Like an ordinary automobile, an electric vehicle can control the acceleration of the vehicle by adjusting the degree to which the user, that is, the driver depresses the accelerator pedal.

For example, with respect to the car that the user is stepping on the running has an acceleration of ² m / s 2 to the accelerator pedal, the user when pedaling further the accelerator pedal greater acceleration than ² m / s 2, for example of 3 m / s ² acceleration So that the vehicle can be driven. On the other hand, the user can cause the vehicle to travel at an acceleration of less than 2 m / s ² , such as an acceleration of 1 m / s ² , when the accelerator pedal is depressed less.

In this way, the user can adjust the acceleration of the vehicle according to the degree of depression of the accelerator pedal, that is, the depression degree of the accelerator pedal. The acceleration measuring unit 200 can measure the acceleration of the vehicle according to the depression degree of the accelerator pedal by the user have.

Here, the acceleration measuring unit 200 may measure the acceleration of the vehicle using the angle of the accelerator pedal.

3 is a view schematically showing a configuration in which the angle of the accelerator pedal 210 is changed when the accelerator pedal 210 of the vehicle is depressed by the user.

Referring to FIG. 3, an electric vehicle is provided with an accelerator pedal 210 for driving the vehicle and adjusting the traveling speed of the vehicle. The user (driver) The speed and acceleration of the motor can be adjusted.

In particular, the acceleration can be determined according to the degree of depression of the accelerator pedal 210, and the degree of depression of the accelerator pedal 210 can be judged as an angle change value of the accelerator pedal 210. That is, when the user depresses the accelerator pedal 210 to change from the position a to the position b, the angle of the accelerator pedal 210 is changed, and the angle change value at this time can be referred to as?.

At this time, the acceleration measuring unit 200 may measure the acceleration of the vehicle according to the degree of change of the angle of the accelerator pedal 210. For example, the acceleration measurement unit 200 may θ is 5 degrees (°) measured at 5 m / s ² acceleration if, it is possible to measure the acceleration with 10m / s ² when θ is 10 degrees .

The speed change amount per hour of the vehicle may be based on the actual speed change amount of the vehicle. That is, the acceleration measuring unit 200 can measure the speed change amount per hour of the vehicle by measuring the actual speed and time of the vehicle.

For example, if the actual speed of the vehicle has increased from 10 m / s to 20 m / s for one second, the acceleration measuring unit 200 calculates the acceleration of the vehicle by using the equation 'acceleration = speed / time' m / s < ² >.

In this way, the acceleration measuring unit 200 can measure the actual acceleration of the vehicle by measuring the actual speed of the vehicle and calculating the variation per unit time. In order to measure the actual speed of the vehicle, the acceleration measuring unit 200 may use a conventional speed meter provided in the electric vehicle, GPS, or various speed measuring devices known at the time of filing of the present invention .

The driving motor 300 receives electric power from the battery and drives the vehicle. Particularly, since the vehicle drive apparatus according to the present invention includes both the high output battery (the first battery 110) and the high capacity battery (the second battery 120), the drive motor 300 can be a high output battery or a high capacity battery As shown in Fig. Then, the drive motor 300 can drive the electric vehicle by converting the supplied electric energy into mechanical energy.

The switching unit 400 is provided in a power supply path from the first battery 110 and the second battery 120 to the drive motor 300. Thus, the switching unit 400 selectively switches the power supply path from the first battery 110 or the second battery 120 to the drive motor 300. That is, the switching unit 400 switches the power supply path from the first battery 110 to the driving motor 300 through the switching, or the power supply path from the second battery 120 to the driving motor 300 .

The control unit 500 receives a measured value of the rate of change per unit time, that is, an acceleration measurement value, from the acceleration measuring unit 200. Then, the control unit 500 compares the received acceleration measurement value with the reference value. Here, the reference value is a reference value to be compared with the measured value with respect to the rate of change per unit time (acceleration). The reference value may be a value that can determine whether the output of the battery is much needed or less. Therefore, when the measured value of the acceleration is larger than the reference value, it can be determined that the output of the battery is much needed, and when the measured value of the acceleration is smaller than the reference value, However, it is apparent to those skilled in the art that various reference values may be employed in consideration of various conditions, depending on various conditions such as the type of battery, vehicle, performance, and specifications.

Since the reference value is compared with the measured value, it can have the same unit as the measured value. For example, if the acceleration is measured in units of 'm / s ² ' by the acceleration measuring unit 200, the reference value may also have such 'm / s ² ' units. Further, if the acceleration is measured by the acceleration measuring unit 200 as an angle (°) in which the pedal is depressed, the reference value may also have a unit of degree (°) corresponding thereto.

Meanwhile, the reference value may be stored in advance in a storage device provided in the control unit 500. However, the present invention is not necessarily limited to such an embodiment, and the reference value may be stored in a separate storage device outside the control unit 500. [

When the acceleration measurement value of the vehicle is compared with the reference value, the control unit 500 controls the switching unit 400 according to the comparison result to determine the battery to supply power to the drive motor 300.

First, when the acceleration measurement value of the vehicle by the acceleration measuring unit 200 is equal to or greater than the reference value, the control unit 500 controls the switching unit 400 to supply power from the first battery 110 to the driving motor 300 . If the acceleration measurement value is equal to or greater than the reference value, it is preferable that the battery has relatively high output because the acceleration of the vehicle is relatively high, that is, the output of the battery should be relatively increased. Accordingly, the control unit 500 can control the switching unit 400 to supply power from the first battery 110, which is a high-output battery, to the driving motor 300. 2, the control unit 500 connects the switch S11 to the positive terminal side of the first battery 110 and connects the switch S12 to the negative terminal side of the first battery 110, So that power can be supplied from the motor 110 to the driving motor 300.

On the other hand, when the acceleration measurement value of the vehicle by the acceleration measurement unit 200 is less than the reference value, the control unit 500 controls the switching unit 400 to supply power from the second battery 120 to the drive motor 300 . If the acceleration measurement value is less than the reference value, since the acceleration of the vehicle is not relatively high, that is, the output of the battery is not increased, the use of a battery having a higher capacity than the battery having a relatively high output desirable. Accordingly, the control unit 500 can control the switching unit 400 to supply power from the second battery 120, which is a high capacity battery, to the driving motor 300. 2, the control unit 500 connects the switch S11 to the positive terminal side of the second battery 120, connects the switch S12 to the negative terminal side of the second battery 120, So that power can be supplied from the motor 120 to the driving motor 300.

For a more specific example, assume that the reference value for the acceleration of the vehicle is 5 m / s ² . In this case, if the acceleration measurement value by the acceleration measuring unit 200 is 7 m / s ² , since the acceleration measurement value is larger than the reference value, the control unit 500 controls the switching unit 400 to control the driving motor 300 1 battery 110 can be connected. Therefore, in such a situation, a high battery output can be supplied to the drive motor 300 by supplying power from the first battery 110 having a high output to the drive motor 300. On the other hand, if the acceleration measurement value by the acceleration measuring unit 200 is 3 m / s ² , since the acceleration measurement value is smaller than the reference value, the control unit 500 controls the switching unit 400, So that the battery 120 can be connected. Therefore, in this situation, power is supplied to the drive motor 300 from the second battery 120 whose output is not high but the capacity is large, thereby preventing an unnecessarily high battery output from being consumed and allowing the battery to be used for a long time have.

As another example, it is assumed that the acceleration of the vehicle is determined as a change angle at which the accelerator pedal is depressed, and the reference value for the acceleration of the vehicle is 10 DEG. At this time, if the angle of change of the accelerator pedal measured by the acceleration measuring unit 200 is 15 degrees, since the acceleration measurement value is larger than the reference value, the control unit 500 controls the switching unit 400 to control the driving motor 300 So that the first battery 110 can be connected. On the other hand, if the angle of change of the accelerator pedal measured by the acceleration measuring unit 200 is 5 °, the acceleration measurement value is smaller than the reference value, so that the control unit 500 controls the switching unit 400 to control the driving motor 300 So that the second battery 120 can be connected.

The control unit 500 may control the switching unit 400 to supply power from the first battery 110 to the driving motor 300 when the vehicle starts. It is preferable that the first battery 110 having a high output power supplies power to the drive motor 300 because a high battery output is required when the vehicle is started. Therefore, it is preferable that the control unit 500 controls the switching unit 400 so that a power supply path from the first battery 110 to the driving motor 300 is formed at the time of starting the vehicle.

At this time, the control unit 500 may control the switching unit 400 when the vehicle is started by the driver so that the first battery 110 and the driving motor 300 are connected. That is, when the driver starts the vehicle, the start signal is transmitted to the control unit 500, and the control unit 500 controls the switching unit 400 so that the first battery 110 and the drive motor 300 So that a power supply path can be formed. In this case, the control unit 500 can maintain the connection between the first battery 110 and the drive motor 300 until the vehicle speed reaches a predetermined speed after the vehicle starts.

Also, preferably, the controller 500 may charge the battery that does not supply power to the drive motor 300. The control unit 500 may control the operation of the first battery 110 and the second battery 120 so that the first battery 110 and the second battery 120 can be charged with the rotation of the driving motor 300. [ Any one of them can be selected and charged.

For example, when the vehicle decelerates, power may not be supplied from the first battery 110 and the second battery 120. In this case, the control unit 500 may control the first battery 110 and the second battery 120, (120), so that the selected battery can be charged through the rotational force of the driving motor (300).

In addition, when power is supplied from any one of the batteries to the drive motor 300, the controller 500 can charge the other batteries that do not supply the drive power. For example, when power is supplied from the first battery 110 to the driving motor 300, the controller 500 may charge the second battery 120 through the rotation of the driving motor 300.

Also, the controller 500 may be implemented by a BMS (Battery Management System). Here, the BMS means a battery management device that controls the charge / discharge operation of the battery as a whole. However, the present invention is not necessarily limited to the embodiment of the control unit 500, and the control unit 500 may be configured separately from the BMS. In addition, the controller 500 may be separately provided outside the battery pack.

Preferably, the vehicle driving apparatus according to the present invention may further include a constant speed request receiving unit 600, as shown in FIG.

The constant speed request receiving unit 600 receives a constant speed travel request from a user (driver). Here, the constant-speed travel request means that the user requests the vehicle to travel at a constant speed. It does not mean that the vehicle running speed is perfectly constant but includes a speed change within a predetermined range. The constant speed request receiving unit 600 may include input means such as a constant speed mode button in the vehicle driver's seat. In this case, when the driver presses the constant speed mode button while driving, the vehicle can continue running at the same speed even if the driver does not press the accelerator pedal. Such cruise control can be used mainly in a road environment such as a highway or an automobile exclusive road where the vehicle running is smoothly interrupted. The cruise control function may be called another term such as a cruise function.

When the constant speed request from the user is received by the constant speed request receiving unit 600, the controller 500 controls the switching unit 400 to supply power from the second battery 120 to the driving motor 300 . When the constant speed driving is requested, the vehicle will travel at a constant speed. Therefore, when the vehicle is traveling at a constant speed, the high output of the battery is not required compared to the acceleration. Therefore, by allowing the second battery 120 having a low output to supply power to the drive motor 300, excessive battery consumption can be prevented.

Also, preferably, the vehicle drive apparatus according to the present invention may further include a display unit 700 as shown in FIG.

The display unit 700 is a component that provides various information related to a battery to a user. In particular, the display unit 700 may display a battery that supplies driving power to the driving motor 300 to the user. That is, the display unit 700 may display to the user information on which of the first battery 110 and the second battery 120 is supplying power to the driving motor 300. In addition, the display unit 700 can display various information such as the remaining capacity and status information of each battery to the user. Accordingly, the user can determine the state of the battery based on the information displayed on the display unit 700, and utilize the information for management and maintenance of the vehicle.

Meanwhile, although the vehicle driving apparatus using two batteries has been described in the above embodiment, it is needless to say that it is also possible to implement a vehicle driving apparatus using three or more batteries.

4 is a view schematically showing a connection structure of a vehicle drive system according to another embodiment of the present invention.

Referring to FIG. 4, the vehicle driving apparatus according to the present invention may include three batteries: a first battery 110, a second battery 120, and a third battery 130. Here, the first battery 110 has a higher output than the second battery 120 and the third battery 130, and the second battery 120 has a higher capacity than the first battery 110 and the third battery 130 high. The output of the third battery 130 is lower than that of the first battery 110 but the capacity thereof is higher than that of the second battery 120, but the output of the third battery 130 is higher than that of the second battery 120. That is, the first battery 110 is a high-power battery, the second battery 120 is a high-capacity battery, and the third battery 130 has a capacity and an output of the first battery 110 and the second battery 120 It can be said that the battery has medium performance.

When these three batteries are included, the driving motor 300 receives power from any one of the first battery 110, the second battery 120 and the third battery 130 to drive the vehicle .

The switching unit 400 may selectively switch the power supply path from the first battery 110, the second battery 120, and the third battery 130 to the drive motor 300.

In such a situation, the control unit 500 may compare the amount of change in speed per unit time measured by the acceleration measuring unit 200 with two reference values, i.e., a first reference value and a second reference value to determine from which battery the driving power is to be supplied . This will be described in more detail with reference to FIG.

5 is a diagram showing a battery determined by the control unit 500 to supply drive power according to the acceleration of the vehicle in the embodiment of FIG.

Referring to FIG. 5, the acceleration measured by the acceleration measuring unit 200 is compared with a first reference value and a second reference value. Here, it is assumed that the first reference value has a value higher than the second reference value.

If the acceleration measurement value is equal to or greater than the first reference value, the control unit 500 controls the switching unit 400 so that the first battery 110 can supply the driving power to the driving motor 300. For example, in the embodiment of FIG. 4, the control unit 500 can turn on only the switch S21, and turn off the remaining switches S22 and S23.

However, if the acceleration measurement value is less than the second reference value, the control unit 500 controls the switching unit 400 so that the second battery 120 can supply power to the driving motor 300. For example, in the embodiment of FIG. 4, the control unit 500 may turn on only the switch S22 and turn off the switches S21 and S23.

However, if the acceleration measurement value has a value between the first reference value and the second reference value, the control unit 500 controls the switching unit 400 so that the third battery 130 can supply power to the driving motor 300 . For example, in the embodiment of FIG. 4, the control unit 500 can turn on only the switch S23 and turn off the switches S21 and S22.

According to this embodiment, a battery of various performances is provided in a vehicle, and a battery having a performance suitable for the acceleration of the vehicle is used, so that the energy of the battery can be utilized more efficiently.

The automobile according to the present invention may include the above-described vehicle drive apparatus. Particularly, the above-described vehicle driving apparatus is preferably applied to an electric vehicle. In such a case, in an environment in which an electric vehicle is used as a driving power supply source in a road environment in which a vehicle can not be driven at a constant speed, such as driving in a city, and a vehicle is frequently accelerated, a high- In general, a high capacity battery can be used as a driving power source. Therefore, according to the present invention, the performance of a battery, which is a core component of an electric vehicle, can be efficiently used, so that the performance of the electric vehicle can be improved and management can be facilitated.

6 is a flowchart schematically showing a vehicle driving method using a plurality of batteries according to an embodiment of the present invention.

Referring to FIG. 6, the acceleration of the vehicle, that is, the velocity change per hour is measured (S110), and the acceleration measurement value is compared with the reference value (S120). As a result of the comparison, if the acceleration measurement value is equal to or greater than the reference value, the switching unit is controlled to supply power from the first battery, which is a high-output battery, to the driving motor at step S130. On the other hand, if the acceleration measurement value is less than the reference value, the switching unit is controlled to supply power from the second battery, which is a high capacity battery, to the driving motor (S140).

Advantageously, in step S110, the acceleration of the vehicle may be measured based on an acceleration request by the user. More preferably, the acceleration of such a vehicle can be judged by measuring the degree of depression of the accelerator pedal provided in the vehicle.

Also preferably, in step S110, the acceleration of the vehicle may be measured based on the actual speed of the vehicle.

Also, preferably, steps S130 and S140 may be performed by the BMS of the battery.

7 is a flowchart schematically showing a vehicle driving method according to another embodiment of the present invention.

Referring to FIG. 7, in the same manner as that shown in FIG. 6, the vehicle acceleration measurement step S220, the acceleration measurement value comparison step S230, and the acceleration measurement value (S240), and controlling the switching unit to supply power from the second battery to the driving motor when the acceleration measurement value is less than the reference value (S250).

In addition, the vehicle driving method according to the present invention may further include a step (S210) of receiving a constant-speed travel request of the vehicle from the user, as shown in Fig. In this case, when the constant-speed running by the user is requested, the switching unit can be controlled so that power is supplied from the second battery to the driving motor.

Also, preferably, the vehicle driving method according to the present invention may further comprise performing charging for a battery that does not supply power to the driving motor, as shown in Fig. That is, when electric power is supplied from the first battery to the drive motor, the second battery can be charged using the rotation of the drive motor (S260). If electric power is supplied from the second battery to the drive motor The first battery may be charged (S270).

Further, preferably, the vehicle driving method according to the present invention may further comprise the step of displaying to the user which battery the battery supplying the driving motor with power is, as shown in Fig. 7 (S280, S290 ).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

In the present specification, the term 'part' is used, such as 'acceleration measuring part', 'switching part', 'control part' and the like, but it is a logical constitutional unit and must be physically separated or physically separated It will be apparent to those skilled in the art that the present invention is not limited to these embodiments.

110: First battery
120: Second battery
200: acceleration measuring unit
300: drive motor
400:
500:
600: constant speed request receiver
700:

Claims (19)

A first battery and a second battery having a lower output and higher capacity than the first battery;
An acceleration measuring unit for measuring a speed change amount per hour of the vehicle;
A driving motor for receiving the electric power from the first battery or the second battery and driving the vehicle;
A switching unit selectively switching a power supply path from the first battery or the second battery to the driving motor; And
Controls the switching unit to supply power from the first battery to the driving motor when the measured value of the rate of change per unit time is equal to or greater than the reference value, And controlling the switching unit so that power is supplied from the second battery to the driving motor when the measured value of the change amount is less than the reference value,
And a plurality of batteries that are connected to the vehicle. The method according to claim 1,
Wherein the acceleration measuring unit measures a speed change amount per hour of the vehicle on the basis of an acceleration request by a user. 3. The method of claim 2,
Wherein the acceleration measuring unit measures a speed change amount per hour of the vehicle in accordance with a degree of depression of an accelerator pedal provided in the vehicle. The method according to claim 1,
Wherein the acceleration measuring unit measures the actual speed of the vehicle and measures the speed change amount per hour of the vehicle. The method according to claim 1,
Wherein the control unit controls the switching unit so that electric power is supplied from the first battery to the driving motor at the start of the vehicle. The method according to claim 1,
Further comprising a constant speed request receiving unit for receiving a constant speed driving request from a user,
Wherein the control unit controls the switching unit to supply power from the second battery to the driving motor when the constant speed request of the user is received by the constant speed request receiving unit. The method according to claim 1,
Wherein the controller is configured to perform charging using a rotation of the driving motor with respect to a battery that does not supply power to the driving motor. The method according to claim 1,
Wherein the control unit is implemented by a BMS. The method according to claim 1,
And a display unit for displaying a battery for supplying driving power to the driving motor to the user. The method according to claim 1,
And a third battery whose output is lower than the first battery, higher than the second battery, lower than the second battery and higher than the first battery,
Wherein the driving motor drives the vehicle by receiving power from the first battery, the second battery or the third battery,
Wherein the switching unit selectively switches the power supply path from the first battery, the second battery or the third battery to the drive motor,
Wherein the control unit controls the switching unit to supply power from the first battery to the driving motor when the rate of change per unit time measured by the acceleration measuring unit is equal to or greater than a first reference value, And controls the switching unit to supply power from the third battery to the driving motor when the detected amount of change in speed per unit time is less than the second reference value, Wherein the control unit controls the switching unit so as to control the switching unit. An automobile comprising the vehicle drive device according to claim 1. A method of driving a vehicle by supplying power to a driving motor of a vehicle using a first battery and a second battery having a lower output and a higher capacity than the first battery,
Measuring an acceleration of the vehicle;
Comparing the measured acceleration of the vehicle with a reference value; And
Controlling the switching unit to supply power from the first battery to the driving motor when the acceleration is equal to or greater than the reference value and controlling the switching unit to supply power from the second battery to the driving motor when the acceleration is less than the reference value
Wherein the vehicle is a vehicle. 13. The method of claim 12,
Wherein the acceleration of the vehicle is measured on the basis of an acceleration request by a user. 14. The method of claim 13,
Wherein the acceleration of the vehicle is measured according to a degree of depression of an accelerator pedal provided in the vehicle. 13. The method of claim 12,
Wherein the acceleration of the vehicle is measured based on the actual speed of the vehicle. 13. The method of claim 12,
Further comprising receiving a constant speed travel request from a user,
Wherein the step of controlling the switching unit controls the switching unit to supply power from the second battery to the driving motor upon receiving the constant speed traveling request. 13. The method of claim 12,
Further comprising the step of performing charging using a rotation of the driving motor with respect to a battery that does not supply power to the driving motor. 13. The method of claim 12,
Wherein the control step of the switching unit is performed by a BMS. 13. The method of claim 12,
Further comprising the step of displaying to the user a battery that supplies power to the drive motor.

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