KR102335347B1 - Apparatus and method of controlling charge/discharge for vehicle - Google Patents

Abstract

The present invention relates to a vehicle charging/discharging control device, and more particularly, to a vehicle charging/discharging control device and method capable of charging and discharging a battery by controlling a variable voltage of an alternator during shifting.
To this end, the vehicle charging/discharging control apparatus according to an embodiment of the present invention includes an alternator connected to an engine and a belt through a belt, a transmission connected to the engine and receiving driving force from the engine, and electrically connected to the alternator for charging. A data detector that detects state data for controlling the discharged battery, the alternator, the transmission and the battery, and the state data are used to determine the occurrence of a shift, and when a shift occurs, the reference voltage of the alternator is changed to a set voltage. and a controller for controlling charging and discharging of the battery.

Description

A vehicle charging/discharging control device and method {APPARATUS AND METHOD OF CONTROLLING CHARGE/DISCHARGE FOR VEHICLE}

The present invention relates to a vehicle charging/discharging control device, and more particularly, to a vehicle charging/discharging control device and method capable of charging and discharging a battery by controlling a variable voltage of an alternator during shifting.

BACKGROUND ART In general, a vehicle is equipped with many electric devices such as a lamp, an air conditioner, as well as an electric device for an engine starting device or an ignition device. A battery and an alternator are used as means for supplying power to such an electric device.

The electric power required by the vehicle is generated from the alternator driven by the engine output, charged in the battery, and distributed to each necessary electric system such as lighting, instrumentation, warning display device, and heating and cooling system as needed. will be supplemented

The vehicle varies the power generation voltage of the alternator to improve fuel efficiency. That is, in the acceleration and constant speed sections, the voltage is lowered to reduce the load on the alternator to discharge the battery, and in the deceleration section, the voltage is increased to increase the load on the alternator and charge the battery.

In the engine, RPM (Revolution Per Minute) changes due to changes in vehicle speed and gear while the vehicle is driving. Accordingly, when the vehicle accelerates, the RPM of the engine rises, and when the vehicle is up-shifted, the RPM of the engine decreases and the RPM of the alternator also changes.

When upshifting, the friction force of the engine is a factor that causes the RPM to drop, and the rotational inertia of the alternator is a factor that prevents the RPM from dropping. These two different forces act as a pulling force on the belt connecting the engine and the alternator, reducing the lifespan of the belt. That is, during the upshift, the belt tension increases due to the rotational inertia of the alternator and the durability is deteriorated.

In addition, during downshifting during deceleration, the load on the alternator increases and becomes a factor that prevents the increase of the RPM, so the belt tension increases and durability decreases.

Matters described in this background section are prepared to improve understanding of the background of the invention, and may include matters that are not already known to those of ordinary skill in the art to which this technology belongs.

An embodiment of the present invention provides a vehicle charging/discharging control apparatus and method capable of controlling a variable voltage of an alternator during shifting.

In addition, an embodiment of the present invention provides an apparatus and method for controlling charging and discharging of a vehicle capable of varying a voltage of an alternator according to a shift.

In an embodiment of the present invention, the alternator is connected to the engine and the belt; a transmission connected to the engine and receiving driving force from the engine; a battery electrically connected to the alternator for charging and discharging; a data detector for detecting state data for controlling the alternator, the transmission and the battery; and a controller for determining shift occurrence using the state data, and changing the reference voltage of the alternator to a set voltage when shift occurs to control charging and discharging of the battery. have.

Also, when the shift occurs, the controller determines whether the shift is up-shift or down-shift, and when the shift occurs, lowers the reference voltage of the alternator to a first set voltage to control discharging of the battery.

Also, when the shift occurs, the controller determines whether the shift is upshift or downshift, and increases the reference voltage of the alternator to a second set voltage when the shift occurs to control charging of the battery.

In addition, the controller may determine shift completion by using the state data, and return from the set voltage to the reference voltage when the shift is completed.

In addition, after determining shift occurrence using the state data, the delay time passes at the shift occurrence judgment time, and then, the controller controls the transmission to perform shift, and sets the reference voltage of the alternator from the shift occurrence judgment timing to the actual shift timing. It can be changed to the set voltage.

In addition, the data detector includes a speed sensor for detecting the speed of the vehicle; an acceleration sensor that detects the acceleration of the vehicle; and an accelerator pedal position sensor configured to detect a position value of the accelerator pedal.

And in another embodiment of the present invention, in a method for controlling the charging and discharging of a battery in a vehicle charging/discharging control device including an alternator connected to the engine and a belt through a belt and a battery electrically connected to the alternator to be charged and discharged, the state verifying the data; determining shift occurrence by using the state data; changing the reference voltage of the alternator to a set voltage when the shift occurs; and controlling the charging and discharging of the battery by using the set voltage.

According to an embodiment of the present invention, since the battery can be charged and discharged by controlling the variable voltage of the alternator during shift, durability of the belt connecting the engine and the alternator can be improved.

In addition, since the voltage to be supplied to the alternator can be varied according to the speed change, the tension of the belt can be minimized.

In addition, the effects obtainable or predicted by the embodiments of the present invention are to be disclosed directly or implicitly in the detailed description of the embodiments of the present invention. That is, various effects predicted according to an embodiment of the present invention will be disclosed in the detailed description to be described later.

1 is a diagram illustrating an apparatus for controlling charge and discharge of a vehicle according to an embodiment of the present invention.
2 is a flowchart illustrating a method for controlling charging and discharging of a vehicle according to an embodiment of the present invention.
3 is a graph illustrating an engine RPM and an alternator voltage during acceleration in a method for controlling vehicle charge/discharge according to an embodiment of the present invention.
4 is a graph illustrating an engine RPM and an alternator voltage when decelerating in a method for controlling charging and discharging of a vehicle according to an embodiment of the present invention.
5 is a graph illustrating an engine RPM and an alternator voltage during acceleration in a method for controlling charging and discharging of a vehicle according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings and description, an operating principle of a vehicle charge/discharge control apparatus and method according to an embodiment of the present invention will be described in detail. However, the drawings shown below and the detailed description given below relate to one preferred embodiment among various embodiments for effectively explaining the features of the present invention. Accordingly, embodiments of the present invention should not be limited only to the following drawings and description.

In addition, when it is determined that a detailed description of a related well-known function or configuration may unnecessarily obscure the gist of the present invention in describing embodiments of the present invention, the detailed description thereof will be omitted. And the terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

In addition, in the following embodiments, terms will be appropriately modified, integrated, or separated so that those of ordinary skill in the art can clearly understand them in order to effectively describe the key technical features of the present invention. , the present invention is by no means limited.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a vehicle charging/discharging control apparatus according to an embodiment of the present invention.

Referring to FIG. 1 , an apparatus for controlling charge and discharge of a vehicle according to an embodiment of the present invention includes an engine 10 , an alternator 20 , a battery 50 , a transmission 60 , a data detector 110 and a controller 150 . includes

The engine 10 generates driving force by burning fuel. That is, the engine 10 may be various known engines 10 such as a gasoline engine or a diesel engine using an existing fossil fuel. The rotational driving force generated by the engine 10 is transmitted to the transmission 60 side.

The alternator 20 is connected to the engine 10 through a belt. That is, the alternator 20 is connected to the engine 10 through a belt and a pulley. Accordingly, when the engine 10 rotates, the alternator 20 rotates by the rotational force transmitted through the belt.

The alternator 20 charges the battery 50 when the voltage is higher than the reference voltage under the control of the controller 150 and discharges the battery 50 when the voltage is lower than the reference voltage.

The battery 50 includes a plurality of unit cells, and supplies power to an electric load (not shown). Such an electric load may represent a component driven with low power, such as lighting, instruments, warning display devices, and heating and cooling devices.

The battery 50 may be charged or discharged according to the voltage of the alternator 20 .

The transmission 60 converts the output torque of the engine 10 into a target torque. That is, the transmission 60 converts the torque received by selecting a gear stage according to the vehicle speed and the position value of the accelerator pedal into a target torque, and outputs the converted target torque to the driving wheel as a driving force to drive the vehicle.

The data detector 110 detects state data to control the alternator 20 , the battery 50 , and the transmission 60 . The data detector 110 may detect the state data periodically or aperiodically according to the control of the controller 150 .

To this end, the data detector 110 includes a speed sensor 113, an acceleration sensor 115, an accelerator pedal position sensor (hereinafter referred to as 'APS', 117) and a brake pedal position sensor (Brake Position Sensor: Hereinafter referred to as 'BPS', 119) is included.

The speed sensor 113 detects the speed of the vehicle. The speed sensor 113 provides the detected vehicle speed to the controller 150 .

The speed sensor 113 may be mounted on a driving wheel of a vehicle. Meanwhile, when the speed sensor 113 is not provided, the controller 150 may calculate the vehicle speed using the GPS signal received from the GPS.

The acceleration sensor 115 detects an acceleration of the vehicle and provides the detected vehicle acceleration to the controller 150 .

When the acceleration sensor 115 is not provided, the controller 150 may calculate the vehicle acceleration using the vehicle speed.

The APS 117 detects the degree to which the driver depresses the accelerator pedal. That is, the APS 117 detects the position value of the accelerator pedal (the degree to which the accelerator pedal is pressed) and provides a signal corresponding thereto to the controller 150 . When the accelerator pedal is fully depressed, the position value of the accelerator pedal may be 100%, and when the accelerator pedal is not depressed, the position value of the accelerator pedal may be 0%.

Meanwhile, instead of using the APS 117 , a throttle valve opening degree sensor mounted on the intake passage may be used.

The BPS 119 detects the degree to which the driver depresses the brake pedal. That is, the BPS 119 detects the position value of the brake (the degree to which the accelerator pedal is pressed) and provides a signal corresponding thereto to the controller 150 . When the brake pedal is fully pressed, the position value of the brake pedal may be 100%, and when the brake pedal is not pressed, the position value of the brake pedal may be 0%.

The controller 150 controls the overall operation of the vehicle, and controls the engine 10 , the alternator 20 , the battery 50 , the transmission 60 , and the data detector 110 which are components of the charge/discharge control device.

The controller 150 receives status data from the data detector 110 . The controller 150 determines whether a shift occurs based on the state data, and changes the reference voltage of the alternator 20 to a set voltage when the shift occurs. The controller 150 controls charging and discharging of the battery 50 through the alternator 20 changed to a set voltage.

The controller 150 may be implemented as one or more processors operating according to a set program, and the set program may be programmed to perform each step of the charge/discharge control method according to an embodiment of the present invention. Such a charging/discharging control method will be described in detail with reference to FIGS. 2 to 5 .

Since the normal operation in the vehicle according to the embodiment of the present invention including the above function is performed in the same or similar manner to that of the conventional vehicle, a detailed description thereof will be omitted.

Hereinafter, a method of controlling charging and discharging in a vehicle will be described with reference to FIGS. 2 to 5 .

2 is a flowchart illustrating a method for controlling charging and discharging of a vehicle according to an embodiment of the present invention, and FIG. 3 is a graph showing engine RPM and alternator voltage during acceleration in a method for controlling charging and discharging of a vehicle according to an embodiment of the present invention. 4 is a graph showing engine RPM and alternator voltage during deceleration in a method for controlling charge and discharge of a vehicle according to an embodiment of the present invention, and FIG. 5 is a method for controlling charge and discharge of a vehicle according to another embodiment of the present invention. It is a graph showing engine RPM and alternator voltage during acceleration.

Referring to FIG. 2 , the controller 150 checks the state data ( S210 ). That is, the data detector 110 detects the state data including the vehicle speed, the vehicle acceleration, the position value of the accelerator pedal, and the position value of the brake pedal, and provides the detected state data to the controller 150 . The controller 150 receives and confirms the state data from the data detector 110 .

Meanwhile, although it is described herein that the state data is checked before determining whether a shift occurs, the present invention is not limited thereto, and the controller 150 may periodically or aperiodically receive and confirm the state data from the data detector 110 .

The controller 150 determines whether a shift occurs using the state data (S220). In other words, the controller 150 determines whether a shift occurs using the vehicle speed of the state data, the position value of the accelerator pedal, and the vehicle acceleration. That is, the controller 150 may check the target gear stage matched to the vehicle speed and the position value of the accelerator pedal through the shift map. Here, the shift map indicates a map preset to perform shifting, and may include gear stages matched to position values of a plurality of accelerator pedals and vehicle speeds.

When the shift occurs, the controller 150 determines whether it is a downshift (S230). In other words, when a shift occurs, the controller 150 determines whether it is a downshift using the current gear stage and the target gear stage engaged with the transmission 60 .

The controller 150 changes the reference voltage of the alternator 20 to the first set voltage when the down shift is performed (S240). That is, the controller 150 controls the discharge of the battery 50 by lowering the reference voltage of the alternator 20 to the first set voltage when the downshift is performed. For example, when the vehicle speed increases, the reference voltage 350 of the alternator 20 can be changed to the first set voltage 360 if it is a downshift 310 as shown in the graph 300 of FIG. 3 . have. In addition, when the vehicle speed decreases, as shown in the graph 400 of FIG. 4 , the reference voltage 350 of the alternator 20 may be changed to the first set voltage 360 when the down shift 410 is performed.

Here, the reference voltage may be set based on the voltage of the battery 50 . For example, if the voltage of the battery 50 is 12.8V, the reference voltage may be 12.7V.

The first set voltage is lower than the reference voltage, and may be a voltage at which the battery 50 is discharged. In this case, the first set voltage may be set by an operator or set through a predetermined algorithm (eg, a program and a probability model). For example, the first set voltage may be 12.5V.

Accordingly, since the charging/discharging control device according to an embodiment of the present invention lowers the voltage of the alternator 20 during downshift, the load of the alternator 20 decreases, and as the RPM of the engine 10 increases, the alternator Since the RPM of (20) rises, the tension of the belt can be reduced and durability can be improved.

The controller 150 changes the reference voltage of the alternator 20 to the second set voltage when it is upshifted (S250). That is, the controller 150 controls the charging of the battery 50 by increasing the reference voltage of the alternator 20 to the second set voltage when it is upshifted. For example, when the vehicle speed increases, the reference voltage 350 of the alternator 20 is set to the second set voltage 370 in the case of the upshift 320 as shown in the graph 300 of FIG. 3 . can be changed

In addition, when the vehicle speed decreases, as shown in the graph 400 of FIG. 4 , the reference voltage 350 of the alternator 20 may be changed to the second set voltage 370 in an upshift 420 .

In addition, although it is indicated that the vehicle speed is increased at the time point 450 of FIG. 4 , this means that the vehicle speed is increased even if the accelerator pedal is not pressed when going downhill. That is, if the position value of the accelerator pedal is 0%, it may be determined that the vehicle speed is decelerated even if the vehicle speed increases.

Here, the second set voltage is higher than the reference voltage, and may be a voltage at which the battery 50 is charged. In this case, the second set voltage may be set by an operator or set through a predetermined algorithm (eg, a program and a probability model). For example, the second set voltage may be 14.8V.

Accordingly, since the charging/discharging control device according to an embodiment of the present invention increases the voltage of the alternator 20 during upshift, the load of the alternator 20 increases, and as the RPM of the engine 10 decreases, the alternator Since the RPM of (20) is reduced, the tension of the belt is reduced, and durability can be improved.

Meanwhile, the controller 150 determines that a shift occurs through the shift map using the state data, and when a shift occurs, the controller 150 controls the transmission 60 to perform the shift after a delay time elapses at the time when the shift occurs. The controller 150 changes the reference voltage of the alternator 20 to the set voltage from the time of determining that the shift occurs until the actual shift.

For example, as shown in the graph 500 of FIG. 5 , the controller 150 determines that the shift occurs at the shift occurrence determination time 530 , and confirms that the shift occurs in the upshift 510 , and determines the shift occurrence determination time ( 530 ). 530), the reference voltage 350 of the alternator 20 is changed to the second set voltage 370 until the actual shift time 540, which is after the delay time has elapsed.

The reason for changing the voltage of the alternator 20 during the delay time is to prevent the dimming phenomenon from occurring because the voltage supplied to the electric load suddenly changes when the voltage is changed during this period because the shift time is short. .

The controller 150 determines shift completion by using the state data (S260). That is, the controller 150 determines that the shift is completed using the vehicle speed, vehicle acceleration, the position value of the accelerator pedal, and the position value of the brake pedal of the state data.

Meanwhile, if the shift is not completed, the controller 150 may periodically determine whether the shift is complete.

When the shift is completed, the controller 150 returns from the set voltage to the reference voltage (S270). In this case, the controller 150 may return to the reference voltage from the set voltage for a set time. In this case, the set time may be a time set in advance as a time set to prevent a sudden change in the voltage of the alternator 20 .

Although the above has been described with reference to a preferred embodiment of the present invention, those of ordinary skill in the art may change the present invention in various ways within the scope not departing from the spirit and scope of the present invention described in the claims below. It will be appreciated that modifications and variations are possible.

10: engine
20: alternator
40: belt
50: battery
60: gearbox
110: data detector
113: speed sensor
115: acceleration sensor
117: APS
119: BPS
150: controller

Claims (11)

alternator connected via a belt to the engine;
a transmission connected to the engine and receiving driving force from the engine;
a battery electrically connected to the alternator to be charged and discharged;
a data detector for detecting state data for controlling the alternator, the transmission and the battery; and
A controller that determines whether a shift occurs by using the state data and controls the charging and discharging of the battery by changing the reference voltage of the alternator to a set voltage when the shift occurs.
After determining shift occurrence by using the state data, the controller controls the transmission to perform shift after a delay time elapses at the shift occurrence judgment timing, and sets the reference voltage of the alternator from the shift occurrence judgment timing to the actual shift timing. A vehicle charging/discharging control device, characterized in that it is changed to According to claim 1,
the controller
When a shift occurs, it is determined whether an upshift or a downshift is performed, and when the shift occurs, the reference voltage of the alternator is lowered to a first set voltage to control the discharge of the battery. According to claim 1,
the controller
The device for controlling charging and discharging of a vehicle, characterized in that, when a shift occurs, it is determined whether an upshift or a downshift is performed, and when the shift occurs, a reference voltage of the alternator is increased to a second set voltage to control charging of the battery. According to claim 1,
the controller
The charging/discharging control apparatus of a vehicle, wherein the shift completion is determined using the state data, and the set voltage is returned to the reference voltage when the shift is completed. delete According to claim 1,
The data detector
a speed sensor that detects the speed of the vehicle;
an acceleration sensor that detects the acceleration of the vehicle; and
an accelerator pedal position sensor detecting a position value of the accelerator pedal;
Charging/discharging control device for a vehicle, characterized in that it comprises at least one of. A method for controlling charging and discharging of a battery in a vehicle charging/discharging control device comprising an alternator connected to an engine and a belt through a belt and a battery electrically connected to the alternator and charged/discharged, the method comprising:
checking status data;
determining shift occurrence by using the state data;
changing the reference voltage of the alternator to a set voltage when the shift occurs; and
Including; controlling the charging and discharging of the battery using the set voltage;
The step of changing to the set voltage includes the steps of, when the shift occurs, controlling the transmission after a delay time has elapsed at the time when the shift occurs, and setting the reference voltage of the alternator from the time when the shift occurs to the actual shift time The charging/discharging control method of the vehicle, characterized in that it further comprises the step of changing the voltage. 8. The method of claim 7,
The step of changing to the set voltage is
determining whether an upshift or a downshift is performed when the shift occurs; and
lowering the reference voltage of the alternator to a first set voltage if the down-shift is performed;
A vehicle charging/discharging control method comprising a. 8. The method of claim 7,
The step of changing to the set voltage is
determining whether an upshift or a downshift is performed when the shift occurs; and
raising the reference voltage of the alternator to a second set voltage if the up-shift is performed;
A vehicle charging/discharging control method comprising a. 8. The method of claim 7,
After the step of controlling the charging and discharging of the battery
determining shift completion by using the state data; and
returning from a set voltage to a reference voltage when the shift is completed;
Charging/discharging control method of a vehicle, characterized in that it further comprises.

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