KR20190061687A - Apparatus and method for controlling belt of mild hybrid electric vehicle - Google Patents

Abstract

According to an embodiment, a belt control apparatus to control tension of a belt of a mild hybrid electric vehicle comprises an engine and a mild hybrid starter and generator (MHSG) electrically connected to a battery to assist output of the engine by being connected to the engine through the belt. The belt control apparatus comprises: a tensioner driven to increase or decrease tension of a belt; and a control unit controlling the tensioner for the tension of the belt to be increased when time at which an engine is in a stalling state is greater than critical time.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a belt control device for a mild hybrid vehicle,

The present disclosure relates to a belt control device and a belt control method of a mild hybrid vehicle.

A hybrid electric vehicle (HEV) is a vehicle that uses two or more kinds of different power sources. The hybrid vehicle is driven by an engine that obtains a driving force by burning fuel and a motor that obtains a driving force by battery power.

Hybrid vehicles are divided into hard-type HEV, soft-type HEV, mild HEV, and micro-HEV depending on the capacity of the motor that powers the engine. .

In a hard hybrid vehicle or soft hybrid vehicle, a thin-type motor is mounted between the engine crankshaft and the transmission to assist motor power, and the battery, which is a motor power source, is charged by a hybrid starter and generator (HSG) connected to the engine. The HSG will function as an ISS (Idle Stop & Start), which serves as a starter for idle operation, as well as charging a high voltage battery.

Mild hybrid vehicles use low capacity batteries and motors compared to hard hybrid vehicles. Mild Hybrid Vehicle (MHSG) is not a separate motor for ISS or ISG (Idle Stop & Go) motors, but it has three power generation, ISG, and engine torque aids as Mild Hybrid Starter and Generator . This MHSG is connected to the engine crankshaft by a belt.

Mild hybrid vehicles use MHSG to assist the engine torque according to driving conditions and to charge the battery through regenerative braking. Therefore, the fuel efficiency of the vehicle can be improved and efficient energy utilization is possible.

In a mild hybrid vehicle, the belt that connects the engine to the MHSG is used to provide an organic power transfer between the components connected to the engine. Therefore, it is necessary to optimally maintain the tension of the belt connecting the engine of the mild hybrid vehicle and the MHSG.

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a belt control device capable of controlling a tension of a belt connecting an engine of a mild hybrid vehicle and an MHSG and a belt control method using the belt control device.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

The belt control apparatus according to an embodiment includes a mild hybrid vehicle (MHSG) including an engine and a mild hybrid starter and generator (MHSG) electrically connected to the battery, which is connected to the engine via a belt and assists the output of the engine. A tensioner for driving the belt to increase or decrease the tension of the belt, and a belt tension control device for controlling the tension of the belt when the time in which the engine is in the stall state is greater than the threshold time And a control section for controlling the tensioner so as to increase.

Wherein the control unit controls the tensioner to increase the tension of the belt when the time in which the engine is in the stall state is less than or equal to the threshold time and the outside air temperature is lower than the threshold temperature, Can be controlled.

The tension of the belt when the time the engine is in the stall state is greater than the threshold time may be greater than the tension of the belt when the outside air temperature is lower than the critical temperature.

The control unit controls the tensioner so that the tension of the belt is increased if the mild hybrid vehicle is running and the amount of change in the position of the accelerator pedal position per unit time is larger than the first threshold value (APS: Accelerator Position Sensor) can do.

And a battery management system (BMS) that detects the SOC of the battery, and the control unit can receive the SOC information of the battery if the variation is below the first threshold.

If the amount of change is smaller than the second threshold value, the control unit may determine whether the battery is regeneratively charged using the SOC information. If the battery is regeneratively charged, the controller may control the tensioner so that the tension of the belt is increased.

If the amount of change is equal to or greater than the second threshold value, the control unit determines whether the battery is regeneratively charged using the SOC information, and controls the tensioner so that the tension of the belt increases when the battery is charged.

The tension of the belt when the amount of change is smaller than the second threshold and the amount of change of the belt when the battery is regenerated and charged may be greater than the second threshold and larger than the tension of the belt when the battery is regenerated and charged.

The tensioner includes a tensioner ball that is in direct contact with the belt, a plunger into which the tensioner ball is inserted, a coil that generates an electromagnetic force in response to the applied current so that the plunger can be moved in the first direction, A spring for generating an elastic force, and a housing for housing a tensioner ball, a plunger, a coil, and a spring.

Wherein a current amount of the current is controlled by a PWM signal applied by the control unit.

A method of controlling a belt according to an exemplary embodiment includes a mild hybrid vehicle (MHSG) including an engine and a mild hybrid starter and generator (MHSG) electrically connected to the battery, Wherein the engine stall time sensor detects a time when the engine is in a stall state, and the control unit determines whether the time when the engine is in the stall state is greater than the threshold time And controlling the tensioner to contact the belt such that the tension of the belt increases if the time the engine is in the stall state is greater than the threshold time.

Detecting a temperature of the outside air of the mild hybrid vehicle when the time in which the engine is in the stall state is equal to or less than the threshold time, determining whether the outside air temperature is lower than the threshold temperature, And controlling the tensioner such that the tension of the belt is increased if the outside air temperature is lower than the critical temperature.

The tension of the belt when the time the engine is in the stall state is greater than the threshold time may be greater than the tension of the belt when the outside air temperature is lower than the critical temperature.

The step of detecting the position of the accelerator pedal by an accelerator pedal position sensor (APS: Accelerator Position Sensor) determines whether the amount of change of the accelerator pedal position per unit time is larger than the first threshold value when the mild hybrid vehicle is running And controlling the tensioner to increase the tension of the belt if the amount of change is greater than the first threshold.

The battery management system (BMS) may detect the SOC of the battery if the amount of change is less than the first threshold, and the control unit may receive the SOC information of the battery.

Determining whether the battery is regeneratively charged using the SOC information when the amount of change is smaller than the second threshold value and controlling the tensioner so that the tension of the belt is increased when the battery is regenerated; .

Determining whether the battery is regeneratively charged using the SOC information if the amount of change is equal to or greater than the second threshold value and controlling the tensioner so that the tension of the belt is increased when the battery is regeneratively charged can do.

The tension of the belt when the amount of change is smaller than the second threshold and the amount of change of the belt when the battery is regenerated and charged may be greater than the second threshold and larger than the tension of the belt when the battery is regenerated and charged.

The effect of the belt control device of the mild hybrid vehicle according to the present disclosure and the belt control method using the belt control device will be described as follows.

According to at least one of the embodiments of the present disclosure, there is an advantage that the belt can be prevented from slipping.

According to at least one of the embodiments of the present disclosure, there is an advantage that fuel economy can be improved.

The effects obtainable from the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below will be.

1 is a block diagram schematically showing a mild hybrid vehicle including a belt control device for a mild hybrid vehicle according to an embodiment.
2 is a view showing a structure in which a belt connects an engine and an MHSG according to an embodiment.
3 is a cross-sectional perspective view showing a tensioner of a belt control apparatus for a mild hybrid vehicle according to an embodiment.
4 is a flowchart showing a belt control method at the start of a mild hybrid vehicle according to an embodiment.
5 is a flowchart showing a belt control method during running of a mild hybrid vehicle according to an embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In addition, since the sizes and thicknesses of the respective components shown in the drawings are arbitrarily shown for convenience of explanation, the present invention is not necessarily limited to those shown in the drawings. In the drawings, the thickness is enlarged to clearly represent the layers and regions. In the drawings, for the convenience of explanation, the thicknesses of some layers and regions are exaggerated.

As used herein, the terms "vehicle", "car", "vehicle", "automobile" or other similar terms are intended to encompass passenger cars including sports utility vehicles (SUVs), buses, A hybrid vehicle (EV), an electric vehicle (EV), a plug-in hybrid vehicle (PHEV), and the like, including a boat, an aircraft including a ship, in hybrid electric vehicles, hydrogen-fueled vehicles and other alternative fuels (for example, fuel derived from resources other than petroleum) vehicles.

Additionally, some methods may be executed by at least one controller. The term controller refers to a hardware device comprising a memory and a processor adapted to execute one or more steps that are interpreted as an algorithmic structure. The memory is adapted to store algorithm steps and the processor is adapted to perform the algorithm steps specifically to perform one or more processes described below.

Further, the control logic of the present invention may be embodied in a non-volatile, readable medium on a computer readable medium, including executable program instructions, executed by a processor, controller, or the like. Examples of computer-readable means include, but are not limited to, ROM, RAM, CD-ROM, magnetic tape, floppy disk, flash drive, smart card and optical data storage. The computer readable medium can be distributed to networked computer systems and stored and executed in a distributed manner, for example, by a telematics server or a CAN (Controller Area Network).

Hereinafter, a belt control apparatus for a mild hybrid vehicle according to an embodiment and a belt control method using the same will be described in detail with reference to FIGS. 1 to 5. FIG.

1 is a block diagram schematically showing a mild hybrid vehicle including a belt control device for a mild hybrid vehicle according to an embodiment. At this time, the belt control device of the mild hybrid vehicle shows only the schematic configuration necessary for the explanation according to the embodiment, and is not limited to this configuration.

1, a mild hybrid vehicle according to an embodiment includes a sensor unit 10, an engine 20, a transmission 30, a Mild Hybrid Starter and Generator (MHSG) 40, A battery 50, a battery management system (BMS) 52, and a belt control unit 60.

 The sensor unit 10 senses data for controlling the belt of the mild hybrid vehicle, and transmits the sensed data to the belt control unit 60. The sensor unit 10 includes an engine stall time sensor 11, an outside air temperature sensor 12, and an accelerator pedal position sensor 13.

The engine stall time sensor 11 detects the time when the engine is in the stall state and transmits the signal to the control unit 60

The ambient temperature sensor 12 detects the temperature of the outside air of the vehicle and transmits the signal to the belt control unit 60.

An accelerator pedal position sensor (APS) 13 detects the position of the accelerator pedal depressed by the driver and transmits the signal to the belt control unit 60.

The engine 20 outputs power in a starting-on state as a power source.

The transmission 30 selects an arbitrary speed change stage according to the vehicle speed and the driving condition to output the driving force to the driving wheels. The transmission 30 may be either an automatic transmission (AMT) or a dual clutch transmission (DCT).

The MHSG 40 is connected to the engine 20 via a belt 70. Specifically, the pulley 42 of the MHSG 40 is connected in a powertrainable manner via a crank pulley 22 mounted on a crankshaft, with the MHSG 40 operating as a motor And the engine is started by transmitting the rotational force to the crankshaft through the belt.

In addition, the MHSG 40 operates as a generator during engine operation to generate electrical energy by receiving the rotational force of the engine, that is, the rotational force of the crankshaft, through the belt, thereby charging the battery 50.

In particular, torque boosting is performed in which the MHSG 40 operates as a motor at the time of driving the vehicle and transmits the torque to the engine 20 side through the belt so that the torque of the MHSG 40 is provided as driving torque for running the vehicle And the energy recovery for charging the battery 50 by generating electric energy by the rotational force transmitted from the engine 20 through the belt 70 by the MHSG 40 as a generator at the time of braking or traveling the vehicle Lt; / RTI >

On the other hand, when applying a swinging component including a MHSG 40 and a power transmission link to the engine via a belt, the tension of the belt 70, that is, the swing belt 70 is automatically adjusted and maintained A tensioner 72 is provided.

In the hybrid vehicle, the MHSG 40 receives power from the engine 20 via the belt 70 or transfers power to the engine 20, so that the tension and relaxed state of the take- (20) and the operating conditions of the MHSG (40).

The battery 50 is electrically connected to the MHSG 40. The battery 50 stores a voltage for driving the MHSG 40. The battery 50 may supply a driving voltage to the MHSG 40 when assisting the output of the engine 20 and a voltage generated by the MHSG 40 during regenerative braking. The battery 50 may be a 48V battery.

A BMS (Battery Management System) 52 controls the SOC of the battery 50. The BMS 52 transmits the SOC information of the battery 50 to the belt control unit 60.

The belt control unit 60 includes a diagnosis unit 61 and a tension control unit 62. [ The diagnosis section 61 diagnoses the connection state of the belt 70 using the rotation speed of the engine 20, the rotation speed of the MHSG 40, and the slip ratio of the belt. The diagnosis section 61 calculates the slip ratio of the belt 70 using the rotational speed of the engine 20 and the rotational speed of the MHSG 40 and determines whether or not the belt 70 is faulty using the calculated slip ratio It can be judged.

The tension controller 62 can increase or decrease the tension of the belt 70 by using the tensioner 72. [

The tension control unit 62 controls the tension of the belt 70 to be increased or decreased by using the rotation speed of the engine 20 and the rotation speed of the MHSG 40.

The tension control unit 62 determines whether the stall time of the engine 20 exceeds the threshold time or the outside temperature is below the threshold temperature at the time of vehicle start ON and increases the tension of the belt 70 Or decrement.

The tension control unit 62 also controls the position of the accelerator pedal and the SOC of the battery 50 so as to increase or decrease the tension of the belt 70 when the vehicle travels.

For this purpose, the belt control 60 may be implemented with one or more processors operating by a set program, and the set program may be programmed to perform each step of the belt control method according to one embodiment.

The belt control unit 60 may be included in an electronic control unit (ECU) of the vehicle or may be integrally formed with the ECU and receive values of various sensors in the vehicle from the ECU.

2 is a view showing a structure in which a belt connects an engine and an MHSG according to an embodiment.

Two tensioners 72a and 72b may be mounted on one swivel belt 70 connected between the crank pulley 22 and the pulley 42 of the starting generator 40 as shown in Fig. Although two tensioners 72a and 72b are shown mounted to one belt 70 in FIG. 2, the number of tensioners 72a and 72b is not limited thereto.

The tensioner ball 720 may be moved under the control of the belt control unit 60 so that the tension of the belt 70 may be adjusted. The tensioner ball 720 is coupled to the plunger 721. By moving the plunger 721 inside the housing 723, the tensioner ball 720 can be moved.

Hereinafter, the structure of the tensioners 72a and 72b will be described with reference to FIG.

3 is a cross-sectional perspective view showing a tensioner of a belt control apparatus for a mild hybrid vehicle according to an embodiment.

3, the tensioner 72a may include a tensioner ball 720, a plunger 721, a spring 722, a housing 723, a coil 724, and a plunger position sensor 725 have.

The tensioner ball 720 is in direct contact with the belt 70. The tensioner ball 720 is inserted into the plunger 721, and a part of the tensioner ball 720 protrudes from the plunger 721.

The plunger 721 may be made of a magnetic material and moves in the first direction D1 by an electromagnetic force generated from the coil 724. The plunger 721 can be divided into a portion where the tensioner ball 720 is inserted and protruded outward from the housing 723 and a portion accommodated in the coil 724 in the housing 723. [

The spring 722 generates an elastic force for moving the plunger 721 in the second direction D2 opposite to the first direction D1. The spring 722 is disposed within the housing 723, between the coil 724 and the plunger 721.

The coil 724 generates an electromagnetic force for moving the plunger 721 in the first direction D1. The coil 724 can be formed by winding an electric wire including copper into a cylindrical shape.

As the current is applied to the coil 724, an electromagnetic force is generated from the coil 724, and the direction of the electromagnetic force can be determined by the direction of the current applied to the coil 724. Also, the magnitude of the electromagnetic force is changed according to the amount of current applied to the coil 724, and the amount of current is controlled by the PWM signal applied from the tension control unit 62.

The housing 723 can receive and fix the coil 724. The housing 200 may be formed in a cylindrical shape having at least a part of the upper surface thereof opened.

The plunger position sensor 725 can be installed inside the housing 723 to detect the displacement of the plunger 721 in the housing 723.

2 and 3, the tensioners 72, 72a, and 72b used in the belt control apparatus and method according to the embodiment are limited to the structures described above. It does not.

Next, a belt control method according to an embodiment will be described with reference to Figs. 4 and 5. Fig.

4 is a flowchart showing a belt control method at the start of a mild hybrid vehicle according to an embodiment.

Referring to FIG. 4, the belt control unit 60 determines whether the starting of the vehicle is on (S10).

The belt control unit 60 receives from the ECU of the vehicle a signal indicating whether the vehicle is in the ON state and determines whether the vehicle is in the ON state (S10). The belt control unit 60 receives the engine stall time information detected through the engine stall time detection sensor 11 (S11) when the vehicle stall is on.

The belt control unit 60 determines whether the stall time of the engine 20 is greater than the threshold time (S12). If it is determined that the engine 20 is in the stall state for a time longer than the critical time, the belt control unit 60 generates the first startup mode PWM signal and applies it to the tensioner 72 (S13).

If it is determined that the engine 20 is in the stall state for less than the critical time, the belt control unit 60 receives the outside air temperature information detected through the outside air temperature sensor 12 (S14).

The belt control unit 60 determines whether the outside air temperature is lower than the threshold temperature (S15). If it is determined that the outside temperature is lower than the critical temperature, the belt control unit 60 generates and outputs the second startup mode PWM signal to the tensioner 72 (S16). If it is determined that the outside temperature is equal to or higher than the threshold temperature, Generates a third startup mode PWM signal and applies it to the tensioner 72 (S17).

The tension of the belt in accordance with the first startup mode PWM signal, the second startup mode PWM signal, and the third startup mode PWM signal is greatest when the tensioner 72 is supplied with the first startup mode PWM signal, and the third startup mode PWM The time when the signal is applied is the smallest.

If the engine 20 is in a stall state for a long time, or if the temperature outside the vehicle is lower than the threshold temperature, slipping of the belt 70 may occur. In particular, when the vehicle is in a stall state for a long time, the belt 70 may further slip. The belt control unit 60 controls the tensioner 72 to further increase the tension of the belt 72 when the engine 20 is in the stall state for a long time or when the temperature outside the vehicle is lower than the threshold temperature . As a result, power transmission to the engine 20 via the belt 72 is possible, and stability of starting the vehicle can be ensured.

5 is a flowchart showing a belt control method during running of a mild hybrid vehicle according to an embodiment.

When the vehicle is running, the belt control unit 60 receives the detected pedal position information through the accelerator pedal position sensor 13 (S20).

The belt control unit 60 calculates a pedal position change per unit time and determines whether the pedal change amount is larger than the first threshold value (S21). If it is determined that the pedal change amount is larger than the first threshold value, the belt control unit 60 generates the first driving mode PWM signal and applies it to the tensioner 72 (S22).

The belt control unit 60 receives the SOC information of the battery 50 from the BMS 52 and receives the outside air temperature information detected through the outside air temperature sensor 12 at S23, Is smaller than the second threshold value (S23).

If it is determined that the pedal change amount is smaller than the second threshold value, the belt control unit 60 uses the SOC information of the battery 50 to determine whether it is regenerative charging (S25).

The belt control unit 60 generates the second driving mode PWM signal and applies it to the tensioner 72 (S26). Otherwise, the belt control unit 60 generates the fourth driving mode PWM signal, (Step S27).

If it is determined that the pedal change amount is equal to or greater than the second threshold value, the belt control unit 60 uses the SOC information of the battery 50 to determine whether or not the regenerative charge is performed (S28).

The belt control unit 60 generates the third driving mode PWM signal and applies it to the tensioner 72 (S29). Otherwise, the belt control unit 60 generates the fifth driving mode PWM signal, (Step S30).

In the case of the tension of the belt in accordance with the first to fifth running mode PWM signals, the tensioner 72 sets the first driving mode PWM signal, the second driving mode PWM signal, the third driving mode PWM signal, the fourth driving mode PWM signal, And the fifth running mode PWM signal.

That is, by increasing the tension of the belt 70 in a high-speed or high-load region such as when the mild hybrid vehicle is running at a high speed or traveling on a backing plate, power transmission to the engine 20 is improved to improve fuel economy , The stability of the acceleration section can be secured.

The embodiments of the present invention described above are not implemented only by the apparatus and method, but may be implemented through a program for realizing the function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. Such a recording medium can be executed not only on a server but also on a user terminal.

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 belongs to the scope of right.

Claims (18)

(EN) A control system for controlling the tension of a belt of a mild hybrid vehicle including an engine and a mild hybrid starter and generator (MHSG) connected to the engine via a belt to assist the output of the engine. The belt control device comprising:
A tensioner which is driven to increase or decrease the tension of the belt, and
And a control unit for controlling the tensioner so that the tension of the belt is increased if the time in which the engine is in the stall state is greater than the threshold time,
. The method according to claim 1,
Further comprising an outside air temperature sensor for detecting an outside air temperature of the mild hybrid vehicle,
Wherein the controller controls the tensioner so that the tension of the belt increases when the time in which the engine is in the stall state is less than the threshold time and the outside air temperature is lower than the threshold temperature,
Belt control device. 3. The method of claim 2,
Wherein the tension of the belt when the engine is in the stall state is greater than the threshold time is greater than the tension of the belt when the outside air temperature is lower than the threshold temperature,
Belt control device. The method according to claim 1,
Further comprising an accelerator position sensor (APS)
Wherein the control unit controls the tensioner so that the tension of the belt increases when the mild hybrid vehicle is running and the change amount of the accelerator pedal position per unit time is greater than a first threshold,
Belt control device. 5. The method of claim 4,
Further comprising a battery management system (BMS) for detecting the SOC of the battery,
Wherein the controller receives the SOC information of the battery when the amount of change is less than the first threshold,
Belt control device. 6. The method of claim 5,
Wherein the controller controls the tensioner to increase the tension of the belt when the battery is regeneratively charged by using the SOC information to determine whether or not the battery is regeneratively charged when the amount of change is smaller than a second threshold,
Belt control device. The method according to claim 6,
Wherein the controller controls the tensioner so as to increase the tension of the belt when the battery is regeneratively charged by using the SOC information to determine whether or not the battery is regeneratively charged when the amount of change is equal to or greater than a second threshold,
Belt control device. 8. The method of claim 7,
Wherein the amount of change is smaller than a second threshold and the tension of the belt when the battery is regenerated is greater than a second threshold and greater than a tension of the belt when the battery is regenerated,
Belt control device. The method according to claim 1,
The tensioner includes:
A tensioner ball in direct contact with the belt,
A plunger into which the tensioner ball is inserted,
A coil for generating an electromagnetic force in accordance with an applied current so that the plunger can be moved in a first direction,
A spring for generating an elastic force in a second direction opposite to the first direction,
And a housing for housing said tensioner ball, plunger, coil, and spring.
Belt control device. 10. The method of claim 9,
Wherein the current amount of the current is controlled by a PWM signal applied by the control unit,
Belt control device. (EN) A control system for controlling the tension of a belt of a mild hybrid vehicle including an engine and a mild hybrid starter and generator (MHSG) connected to the engine via a belt to assist the output of the engine. A belt control method for a belt
The engine stall time sensor detecting a time when the engine is in a stall state,
The control unit judges whether the time when the engine is in the stall state is greater than the threshold time, and
Controlling the tensioner in contact with the belt so that the tension of the belt is increased if the time in which the engine is in the stall state is greater than the threshold time
≪ / RTI > 12. The method of claim 11,
When the time in which the engine is in the stall state is equal to or less than the threshold time, detecting an outside air temperature of the mild hybrid vehicle,
Determining whether the outside air temperature is lower than a critical temperature, and
Controlling the tensioner such that the tension of the belt is increased if the outside air temperature is lower than a critical temperature
≪ / RTI > 13. The method of claim 12,
Wherein the tension of the belt when the engine is in the stall state is greater than the threshold time is greater than the tension of the belt when the outside air temperature is lower than the threshold temperature,
Belt control method. 13. The method of claim 12,
Detecting an accelerator pedal position by an accelerator position sensor (APS)
Determining whether the change amount of the accelerator pedal position per unit time is greater than a first threshold value when the mild hybrid vehicle is running,
The control unit controlling the tensioner such that the tension of the belt is increased if the amount of change is larger than the first threshold value
≪ / RTI > 15. The method of claim 14,
Detecting a SOC of the battery by a battery management system (BMS) if the amount of change is less than or equal to the first threshold; and
The control unit receives the SOC information of the battery
≪ / RTI > 16. The method of claim 15,
If the change amount is smaller than the second threshold value, the controller determines whether the battery is regeneratively charged using the SOC information, and
The control unit controls the tensioner so that the tension of the belt increases when the battery is regeneratively charged
≪ / RTI > 17. The method of claim 16,
Determining whether the battery is regeneratively charged using the SOC information if the amount of change is equal to or greater than a second threshold value;
The control unit controls the tensioner so that the tension of the belt increases when the battery is regeneratively charged
≪ / RTI > 18. The method of claim 17,
Wherein the amount of change is smaller than a second threshold and the tension of the belt when the battery is regenerated is greater than a second threshold and greater than a tension of the belt when the battery is regenerated,
Belt control method.

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