KR102474809B1 - Apparatus and method for controlling regenerative braking of vehicle, vehicle system - Google Patents

Abstract

The present invention relates to an apparatus and method for controlling regenerative braking of a vehicle, and a vehicle system. An apparatus for controlling regenerative braking of a vehicle according to the present invention includes an information collection unit that collects vehicle driving information, a creep power calculation unit that calculates creep power based on a creep torque among the collected vehicle driving information, and a low voltage DC conversion (Low Voltage DC Conversion). voltage DC-DC Converter) When controlling the variable voltage of the system, the mode entry setting value and mode release setting value of the regenerative braking mode according to the driving situation of the vehicle are determined based on the calculated creep power and the default value of the motor power of the vehicle. and a mode control unit that controls entry or release of a regenerative braking mode based on a mode entry setting value and a mode exit setting value according to driving conditions of the vehicle and motor power of the vehicle.

Description

Apparatus and method for controlling regenerative braking of a vehicle, and vehicle system

The present invention relates to an apparatus and method for controlling regenerative braking of a vehicle, and a vehicle system.

Regenerative braking mode at the time of variable voltage control of a general low voltage DC-DC converter system is determined to enter or release depending on the slope of the road and the speed of the vehicle. For example, it does not enter the regenerative braking mode when driving on a flat terrain, and enters the regenerative braking mode when driving on a steel plate coasting or when braking with brakes.

Since the control logic of the variable voltage control logic of the LDC system is composed of the motor power threshold and the compensation factor map according to the vehicle speed and inclination, when the creep torque mapping is changed or a difference in the creep torque mapping value for each vehicle type occurs, the entire mapping is performed. , the efficiency may decrease and the possibility of human error may increase.

In addition, the LDC system needs to enter the LDC regenerative braking mode even on level ground to increase the regenerative energy recovery rate in various main battery charging limit situations, but the conventional control logic does not consider the situation of the main or auxiliary battery and enters the regenerative braking mode and/or Or, it was difficult to enter the LDC regenerative braking mode on level ground because it judged release.

An object of the present invention is to secure logic robustness by increasing efficiency and reducing the possibility of human error by variably controlling a motor power set value for entering and/or releasing a regenerative braking mode in consideration of a vehicle state and/or LDC system efficiency. An apparatus and method for controlling regenerative braking of a vehicle and a vehicle system are provided.

Another object of the present invention is an apparatus and method for controlling regenerative braking of a vehicle for variably controlling a motor power set value for entering and/or releasing a regenerative braking mode based on the calculated creep power by calculating the current creep power of the vehicle. , and to provide a vehicle system.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

In order to achieve the above object, an apparatus for controlling regenerative braking of a vehicle according to an embodiment of the present invention includes an information collection unit that collects vehicle driving information, and creep power based on creep torque among the collected vehicle driving information. Regenerative braking mode according to the driving situation of the vehicle based on the default values of the calculated creep power and the motor power of the vehicle when controlling the variable voltage of the creep power calculation unit and the low voltage DC-DC converter system. A setting unit for setting a mode entry setting value and a mode exit setting value of the vehicle, and entry or release of a regenerative braking mode based on the mode entry setting value and the mode exit setting value according to the driving situation of the vehicle and the motor power of the vehicle. It is characterized in that it comprises a mode control unit for controlling.

The setting unit sets the mode entry setting value to a first setting value based on the calculated creep power and sets the mode release setting value to a second setting value during flatland coasting driving or brake braking. to be characterized

The first set value is a value obtained by adding a first mapping constant to the calculated creep power, and the second set value is a default value of the motor power.

The mode controller enters the regenerative braking mode when the motor power of the vehicle is less than the first set value in the regenerative braking mode release state during flatland coasting driving or brake braking, and enters the regenerative braking mode, the motor power It is characterized in that the control is performed so that the regenerative braking mode is released when A exceeds the second set value.

The setting unit may variably set the mode entry setting value to a first variable setting value and variably set the mode release setting value to a second variable setting value during steel plate coasting driving.

The first variable set value is a default value of the motor power, and the second variable set value is a value obtained by adding a second mapping constant to the default value of the motor power.

The mode control unit enters the regenerative braking mode when the motor power of the vehicle is less than the first variable set value in the regenerative braking mode release state during steel coasting driving, and enters the regenerative braking mode when the motor power is changed to the first variable setting value. 2 It is characterized in that the regenerative braking mode is controlled to be released when the variable setting value is exceeded.

The setting unit resets the mode entry setting value and the mode release setting value to the first setting value and the second setting value when the steel plate coasting driving ends, and the mode control unit resets the steel plate course in a regenerative braking mode entry state. When the driving is finished, if the motor power does not exceed the second set value, the regenerative braking mode entry state is maintained.

The mode control unit controls to enter the regenerative braking mode when charging of the high voltage battery is restricted, and to release the regenerative braking mode when the charging restriction of the high voltage battery is lifted.

The default value of the motor power is 0 [kW].

The information collection unit collects at least one of the braking state information of the vehicle, charge limit information of the high voltage battery, SOC information of the low voltage battery, coasting driving information, road gradient, vehicle speed, and creep torque information. It is characterized by doing.

In addition, a method for controlling regenerative braking of a vehicle according to an embodiment of the present invention for achieving the above object includes collecting driving information of the vehicle, and determining creep power based on creep torque among the collected driving information of the vehicle. The calculating step, when controlling the variable voltage of the low voltage DC-DC converter system, the regenerative braking mode according to the driving situation of the vehicle based on the default values of the calculated creep power and motor power of the vehicle. Setting an entry set value and a mode release set value, and controlling entry or release of a regenerative braking mode based on the mode entry set value and mode release set value according to the driving situation of the vehicle and the motor power of the vehicle It is characterized by including steps.

The setting may include setting the mode entry setting value to a first setting value and setting the mode release setting value to a second setting value based on the calculated creep power during flatland coasting driving or brake braking. It is characterized in that it includes the step of doing.

The controlling of entering or releasing the regenerative braking mode may include controlling entry into the regenerative braking mode when the motor power of the vehicle is less than the first set value in a regenerative braking mode release state during flatland coasting or braking. and controlling the regenerative braking mode to be released when the motor power exceeds the second set value in a regenerative braking mode entry state.

The setting may further include the step of variably setting the mode entry setting value to a first variable setting value and the mode release setting value to a second variable setting value during steel plate coasting driving. to be

Controlling entry or release of the regenerative braking mode may include controlling entry into the regenerative braking mode when the motor power of the vehicle is less than the first variable set value in the regenerative braking mode release state during steel coasting driving; and controlling the regenerative braking mode to be released when the motor power exceeds the second variable set value in a regenerative braking mode entry state.

In addition, in the method for controlling regenerative braking of a vehicle according to an embodiment of the present invention, the mode entry setting value and the mode release setting value are reset to the first setting value and the second setting value when the steel plate coasting driving ends. and controlling the regenerative braking mode entry state to be maintained if the motor power does not exceed the second set value when the steel plate coasting driving ends in the regenerative braking mode entry state. .

The step of controlling entry or release of the regenerative braking mode includes controlling entry into the regenerative braking mode when charging of the high voltage battery is limited, and controlling the regenerative braking mode to be released when the charging restriction of the high voltage battery is lifted. It is characterized by doing.

In addition, a vehicle system according to an embodiment of the present invention for achieving the above object is a vehicle brake system, a battery management system, a driving control system, and at least one of one or more sensors that collect driving information of the vehicle. A communication unit that receives vehicle driving information, collects the vehicle driving information received through the communication unit, calculates creep power of the vehicle, and calculates the creep power when controlling the variable voltage of a low voltage DC-DC converter system. The mode entry setting value and mode release setting value of the regenerative braking mode according to the driving situation of the vehicle are set based on the creep power and the default value of the motor power of the vehicle. It is characterized in that it includes a regenerative braking control device that controls entry or release of a regenerative braking mode based on a mode release setting value and motor power of the vehicle, and an interface unit that outputs operation information of the regenerative braking control device.

According to the present invention, by variably controlling the motor power setting value for entering and/or releasing the regenerative braking mode in consideration of the vehicle state and/or system efficiency, efficiency is increased and the possibility of human error is reduced to secure logic robustness. It works.

1 is a diagram illustrating a vehicle system to which a regenerative braking control device for a vehicle according to an embodiment of the present invention is applied.
2 to 5 are diagrams illustrating an embodiment referred to for explaining an operation of a regenerative braking control device for a vehicle according to an embodiment of the present invention.
6 to 9 are diagrams illustrating an operation flow of a method for controlling regenerative braking of a vehicle according to an embodiment of the present invention.
10 is a diagram illustrating a computing system on which a method according to an embodiment of the present invention is executed.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function hinders understanding of the embodiment of the present invention, the detailed description will be omitted.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term. In addition, unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

A vehicle according to an embodiment of the present invention performs variable voltage control of a low-voltage direct current (LDC) system such as an electric vehicle, a hybrid electric vehicle, and a plug-in hybrid electric vehicle. It goes without saying that any vehicle equipped with a function of controlling regenerative braking through the system can be applied.

In addition, the regenerative braking control device of a vehicle according to the present invention may be implemented inside the vehicle. In this case, the regenerative braking control device of the vehicle may be integrally formed with the internal control units of the vehicle, or may be implemented as a separate device and connected to the control units of the vehicle by a separate connection means.

1 is a diagram showing the configuration of a vehicle system to which a regenerative braking control device for a vehicle according to an embodiment of the present invention is applied.

Referring to FIG. 1 , a vehicle system according to an embodiment of the present invention may include an interface unit 10, a communication unit 20, a storage unit 30, and a regenerative braking control device 100.

The interface unit 10 may include an input unit for receiving a control command from a user and an output unit for outputting an operating state and result of the regenerative braking control device 100 of the vehicle.

Here, the input means may include a key button, and may include a mouse, a joystick, a jog shuttle, a stylus pen, and the like. Also, the input means may include soft keys implemented on a display.

The output unit may include a display and may also include an audio output unit such as a speaker. The display may display information about the regenerative braking mode entry state caused by the operation of the regenerative braking control device 100 of the vehicle.

In addition, when a touch sensor such as a touch film, a touch sheet, or a touch pad is provided in a display, the display operates as a touch screen, and an input unit and an output unit may be integrated.

At this time, the display includes a liquid crystal display (LCD), a thin film transistor liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), and a flexible display. , a field emission display (FED), and a three-dimensional display (3D display).

The communication unit 20 may include a communication module supporting a communication interface with electrical components, control units, and/or systems implemented in the vehicle. As an example, the communication module may receive braking state information from the brake system of the vehicle and SOC information of the high voltage battery from the battery management system. In addition, the communication module may receive coasting driving information from the driving control system of the vehicle. Here, the coasting driving means driving forward by the inertia of the vehicle without manipulating the accelerator or brake of the vehicle. The communication module may receive coasting driving information from a vehicle driving control system. Also, the communication module may receive road gradient information and/or vehicle speed information from sensors in the vehicle.

Here, the communication module may include a module supporting vehicle network communication such as CAN (Controller Area Network) communication, LIN (Local Interconnect Network) communication, and Flex-Ray communication.

The storage unit 30 may store data and/or algorithms necessary for the operation of the regenerative braking control device 100 of the vehicle.

For example, the storage unit 30 stores vehicle information collected by the information collecting unit 120 of the regenerative braking control device 100 of the vehicle, which will be described later. In addition, the storage unit 30 may store condition information for entering and/or releasing the regenerative braking mode. Also, the storage unit 30 may store commands and/or algorithms for controlling entry into and/or release of the regenerative braking mode.

In the embodiment of FIG. 1 , it has been described that data and/or algorithms for the operation of the regenerative braking control device 100 are stored in the storage unit 30 of the vehicle system. A storage device may be implemented.

Here, the storage unit 30 includes RAM (Random Access Memory, RAM), SRAM (Static Random Access Memory), ROM (Read-Only Memory, ROM), PROM (Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read -Only Memory) may be included.

When the vehicle is coasting, the regenerative braking control device 100 determines whether to enter or release the regenerative braking mode by controlling a variable voltage of a low voltage direct current conversion (hereinafter referred to as 'LDC') system.

At this time, the regenerative braking control apparatus 100 variably sets a motor power setting value for entering or releasing the regenerative braking mode in consideration of the state and/or efficiency of the vehicle. For example, the regenerative braking control device 100 may include motor power (creep power) in a low vehicle speed section, brake braking situation, high-voltage battery charging limit situation, steel plate (downhill slope) coasting driving condition, and/or flatland coasting driving condition. Depending on this, it is possible to control entry or release of the regenerative braking mode. Here, the regenerative braking control apparatus 100 may control entry or release of the regenerative braking mode by variably setting a motor power setting value to enter or release the regenerative braking mode during coasting driving on a steel plate (downhill slope).

Looking more closely at the detailed configuration of the regenerative braking control device 100 with reference to FIG. 1 , the vehicle regenerative braking control device 100 includes a control unit 110, an information collection unit 120, a creep power calculation unit 130, a setting A unit 140 and a mode controller 150 may be included. Here, the control unit 110 may process a signal transmitted between each component of the device 100.

First, the information collection unit 120 collects vehicle driving information through a communication unit. For example, the information collection unit 120 may collect vehicle information from the vehicle's braking system, battery management system, and/or driving control system, and sensors that measure the state of the vehicle through the communication unit. At this time, the information collection unit 120 collects vehicle braking state information, high-voltage battery charge limit information, low-voltage battery SOC information, coasting driving information, road gradient, vehicle speed, and/or creep torque information. can do.

The creep power calculation unit 130 calculates the creep power of the current vehicle based on the creep torque information collected by the information collection unit 120 . For example, the creep power calculation unit 130 may calculate the creep power from a value obtained by multiplying the creep torque collected by the information collection unit 120 by the motor RPM. Here, the creep torque is applied as a mapping value according to the vehicle speed, and may be mapped to, for example, a + value at low speed and a - value at high speed. Accordingly, the creep torque may implement a sense of deceleration at a medium speed and a feeling of start at a low speed by using a motor for the purpose of reducing a feeling of dissimilarity with a gasoline (or diesel) vehicle during coasting.

The setting unit 140 performs regenerative braking based on the creep power calculated by the creep power calculation unit 130 and the vehicle information collected by the information collection unit 120 when controlling the variable voltage of the LDC system. Set the motor power setpoint for entering and/or releasing the mode.

The setting unit 140 sets a motor power setting value for entering the regenerative braking mode based on the creep power calculated by the creep power calculation unit 130 when coasting on a flat terrain or when braking with brakes (hereinafter referred to as 'mode entry setting value'). ) is set as the first set value. In this case, the setter 140 may define a value obtained by adding the first mapping constant α to the creep power value calculated by the creep power calculator 130 as the first set value.

In addition, the setting unit 140 sets the motor power set value for releasing the regenerative braking mode (hereinafter, referred to as a 'mode release set value') as a second set value when coasting on a flat terrain or when braking with brakes. do. Here, the second set value may be defined as a default motor power value. For example, the motor power default value may be 0 [kW].

Meanwhile, the setting unit 140 may variably set a motor power setting value for entering and releasing the regenerative braking mode based on a preset mode entry setting value and mode release setting value during coasting driving on a steel plate (downhill slope).

At this time, the setting unit 140 may set the mode entry setting value as the first variable setting value. Here, the first variable set value may be defined as a default motor power value, for example, 0 [kW].

Also, the setting unit 140 may set the mode release setting value as the second variable setting value. Here, the second variable set value may be defined as a value obtained by adding a second mapping constant β to a default motor power value, for example, 0 [kW].

Here, the setting unit 140 may reset the mode entry setting value and the mode release setting value to the first setting value and the second setting value when the steel plate (downhill slope) coasting operation ends.

The mode controller 150 controls entry or release of the regenerative braking mode based on a mode entry setting value, a mode exit setting value, and motor power of the vehicle according to driving conditions of the vehicle.

The mode controller 150 may assign a priority to each driving situation of the vehicle and control entry or release of the regenerative braking mode according to the priority of each driving situation.

For the priority of each driving situation, refer to the embodiment of FIG. 2 .

As shown in FIG. 2, the priority for each driving situation of the vehicle is a low vehicle speed section entry situation, a brake braking situation, a high voltage battery charging limit situation, a regenerative braking (regen) efficiency control mode entry situation, and a steel plate coasting driving situation. , it may be given in order of flatland coasting driving situation.

Accordingly, the mode controller 150 generates a low vehicle speed section entry situation, a brake braking situation, a high voltage battery charging restriction situation, a regenerative braking (regen) efficiency control mode entry situation, a steel coasting driving situation, and/or a flat terrain coasting driving situation. The vehicle's regenerative braking mode can be controlled based on driving conditions with high priority.

First, in the situation of entering a low vehicle speed section, the priority is '1', which is the highest. Accordingly, the mode control unit 150 releases the regenerative braking mode in preference to other driving situations when a low vehicle speed section entry situation occurs.

The brake braking situation has a priority of '2'. Therefore, the mode control unit 150 controls to enter the regenerative braking mode when a brake braking situation occurs in a state where the vehicle has not entered a low vehicle speed section.

In addition, the mode control unit 150 controls to enter the regenerative braking mode when a charging limitation situation of the high voltage battery occurs, and releases the regenerative braking mode when a situation of entering the regenerative efficiency control mode occurs. In addition, the mode controller 150 controls to enter the regenerative braking mode when a steel plate coasting driving situation occurs, and releases the regenerative braking mode when a flatland coasting driving situation occurs.

Meanwhile, the mode controller 150 may control entry or release of the regenerative braking mode by comparing motor power with a preset mode entry setting value and/or mode release setting value for each driving situation.

For an embodiment in which the mode controller 150 controls entry or release of the regenerative braking mode for each driving situation of each vehicle, refer to FIGS. 3 to 5 .

3 illustrates an embodiment of controlling entry or release of a regenerative braking mode when a steel plate coasting driving situation occurs.

Referring to FIG. 3 , the initial L section is a low vehicle speed section, and since the low vehicle speed section is a section in which the motor power is greater than 0, the regenerative braking mode is not entered. Accordingly, the mode controller 150 controls the regenerative braking mode to be released.

Sections t11 to t12 are flatland coasting driving sections, where reference numeral 311 denotes motor power, reference numeral 321 indicates a mode entry setting value, and reference numeral 331 indicates a mode release setting value. The period from T11 to t12 becomes 'motor power > mode entry set value (= first set value)' in the regenerative braking mode release state. Here, the first set value may be defined as a value obtained by adding the first mapping constant value (α, α<0) to the motor power value. Accordingly, the mode controller 150 controls the regenerative braking mode to be released.

Sections T12 to t13 are steel plate coasting driving sections, and in this section, the setting unit 140 variably sets the mode entry setting value to the first variable setting value (=default), and sets the mode release setting value to the second variable setting value (= default + β) can be set variably. Here, the first variable set value is the default value 0 [kW], and the second variable set value is β [kW] obtained by adding the second mapping constant value (β, β > 0) to the default value, as shown by reference numeral 335. . Therefore, the mode control unit 150 controls to enter the regenerative braking mode at the time when 'motor power < the variable mode entry setting value (= the first variable setting value)' in the period from T12 to t13.

The section after T13 is a flat coasting section where the steel plate coasting driving is canceled, and the mode controller 150 compares the motor power value with the mode entry setting value and/or the mode release setting value in the flatland coasting situation to enter the regenerative braking mode. It is possible to control the entry or release of Therefore, since 'motor power < mode release set value' is maintained in the period after T13, the mode control unit 150 can control to maintain the regenerative braking mode entry state.

4 illustrates an embodiment of controlling entry or release of a regenerative braking mode when a high voltage battery charging limit entry situation occurs.

Referring to FIG. 4 , the initial L section is a low vehicle speed section, and since the low vehicle speed section is a section in which the motor power is greater than 0, the regenerative braking mode is not entered. Accordingly, the mode controller 150 controls the regenerative braking mode to be released.

Sections T21 to t22 are flatland coasting driving sections. Reference numeral 411 indicates motor power, reference numeral 421 indicates a mode entry setting value, and reference numeral 431 indicates a mode release setting value. The period from T21 to t22 becomes 'motor power > mode entry set value (= first set value)' in the regenerative braking mode release state. Here, the first set value may be defined as a value obtained by adding the first mapping constant value (α, α<0) to the motor power value. Accordingly, the mode controller 150 controls the regenerative braking mode to be released.

Sections T22 to t23 are high-voltage battery charging limit entry sections. When the high-voltage battery enters the charging limit, the regenerative braking mode is entered regardless of motor power, and when the high-voltage battery charging limit is released, the regenerative braking mode must be released. Therefore, the mode control unit 150 controls to enter the regenerative braking mode during the period from T22 to t23, and controls to enter the regenerative braking mode release state in the period after t23 in which the charging restriction of the high voltage battery is released.

5 illustrates an embodiment of controlling entry or release of a regenerative braking mode when a brake braking situation occurs.

Referring to FIG. 5 , the initial L section is a low vehicle speed section, and since the motor power is greater than 0 in the low vehicle speed section, the regenerative braking mode is not entered. Accordingly, the mode controller 150 controls the regenerative braking mode to be released.

Sections T31 to t32 are flatland coasting driving sections. Reference numeral 511 indicates motor power, reference numeral 521 indicates a mode entry setting value, and reference numeral 531 indicates a mode release setting value. Sections T31 to t32 become 'motor power > mode entry set value (= first set value)' in the regenerative braking mode release state. Here, the first set value may be defined as a value obtained by adding the first mapping constant value (α, α<0) to the motor power value. Accordingly, the mode controller 150 controls the regenerative braking mode release state to be maintained.

Sections T32 to t33 are brake braking sections, and the mode control unit 150 compares the motor power value with the mode entry setting value and/or the mode release setting value in a brake braking situation to control entry or release of the regenerative braking mode. . In this case, when the brake is applied, the motor power value is reduced. Therefore, the mode control unit 150 controls to enter the regenerative braking mode at the time when 'motor power < mode entry set value (= first set value)' in the period from T32 to t33.

The section after T33 is an acceleration section, and the motor power becomes 'motor power > 0' during acceleration.

Therefore, the mode control unit 150 controls the regenerative braking mode to be released at the time when 'motor power > mode release set value (= second set value)' in the section after T33. Here, the second set value becomes the default value of 0 [kW].

The regenerative braking control device 100 of a vehicle according to the present embodiment operating as described above may be implemented in the form of an independent hardware device including a memory and a processor that processes each operation, and may be implemented with a microprocessor or a general-purpose computer system. It can be driven in the form included in other hardware devices such as In addition, the control unit 110, the information collection unit 120, the creep power calculation unit 130, the setting unit 140, and the mode control unit 150 of the device 100 according to the present embodiment may include at least one processor can be implemented as

The operation flow of the device according to the present invention configured as described above will be described in more detail.

FIG. 6 is a diagram showing an operation flow for a method for controlling regenerative braking of a vehicle according to the present invention, and FIGS. 7 to 9 are diagrams showing detailed operation flows for process S700 of FIG. 6 .

Referring to FIG. 6 , the regenerative braking control device of the vehicle collects vehicle information (S100). The vehicle information collected in the 'S100' process may include information on the driving mode, fuel injection status, creep torque, and/or accelerator status of the low voltage direct current (LDC) system.

The regenerative braking control device of the vehicle checks whether the driving mode of the low voltage direct current (LDC) system of the vehicle is the regenerative braking mode from the vehicle information collected in the 'S100' process. If the driving mode of the LDC system is not the regenerative braking mode (S200), the regenerative braking control device of the vehicle checks the fuel injection state of the vehicle. At this time, if the fuel injection is off (S300), the regenerative braking control device of the vehicle calculates the creep power of the current vehicle, that is, the motor power, based on the creep torque of the vehicle (S400). The regenerative braking control device of the vehicle ends the related operation when the creep power calculated in step 'S400' is 0 [kw] or more (S500), and checks whether the accelerator is off. At this time, if the accelerator is off (S600), the regenerative braking control device of the vehicle controls the regenerative braking mode of the LDC system (S700).

In the process of 'S700', the regenerative braking control device of the vehicle determines the relationship between the motor power and the mode entry setting value and/or the mode exit setting value, the auxiliary battery SOC state, the road slope, the charging limit situation of the high voltage battery, the brake braking situation, etc. Accordingly, the regenerative braking mode of the LDC system may be entered or the regenerative braking mode may be released.

Accordingly, with reference to FIGS. 7 and 9 , the detailed operation flow for the 'S700' process is as follows.

First, FIG. 7 illustrates a regenerative braking mode control operation of an LDC system according to a road gradient. The regenerative braking mode control of the LDC system according to the road gradient may be performed when the SOC of the auxiliary battery is less than the SOC set value γ for entering the regenerative braking efficiency control in a state where the high voltage battery does not enter the charging limit.

As shown in FIG. 7 , the regenerative braking control device of the vehicle sets a setting value for entering and releasing the regenerative braking mode, that is, a mode entry setting value and a mode release setting value (S711). Here, the mode entry setting value may be set to a value obtained by adding the first mapping constant value (α, α<0) to the creep power calculated in step 'S400' of FIG. 6 . In addition, the mode release setting value may be set to the default value of motor power, that is, 0 [kw].

When the vehicle's regenerative braking control device is not in the high-voltage battery charging limit entry state (S712) and the SOC of the auxiliary battery is less than the SOC set value (γ) for regenerative braking efficiency control entry (S713), it determines whether the road ramp is a downhill slope. judge

If it is determined that the vehicle has entered a downhill slope (steel coasting driving) (S714), the vehicle's regenerative braking control device variably sets the mode entry setting value and mode release setting value set in step 'S711' (S715). ). For example, the regenerative braking control device of the vehicle changes the mode entry set value from a first set value to a first variable set value. Here, the first variable set value may be set to a default value of motor power, that is, 0 [kw]. Also, the regenerative braking control device of the vehicle changes the mode release setting value from the second setting value to the second variable setting value. Here, the second variable setting value may be set to a value obtained by adding the second mapping constant value (β, β>0) to the default value of motor power, that is, 0 [kw].

At this time, when the motor power of the vehicle is less than the first variable set value (S716), the regenerative braking control device of the vehicle controls to enter the regenerative braking mode of the LDC system (S717).

Subsequently, when the motor power of the vehicle exceeds the second variable set value (S718), the regenerative braking control device of the vehicle may release the regenerative braking mode of the LDC system (S719). If the motor power of the vehicle continues to be equal to or less than the second variable set value, the regenerative braking control device of the vehicle may control the LDC system to maintain the regenerative braking mode entry state.

Meanwhile, in step 'S716', if the state in which the motor power is equal to or greater than the first variable set value continues, the regenerative braking control device of the vehicle may control the LDC system to maintain the release state of the regenerative braking mode.

8 illustrates a regenerative braking mode control operation of an LDC system according to a charging limit situation of a high voltage battery.

When the charging limit of the high voltage battery is entered in step 'S712' of FIG. 7 , the regenerative braking control device of the vehicle performs an operation after 'A' of FIG. 8 .

Accordingly, as shown in FIG. 8 , the regenerative braking control device of the vehicle activates the regenerative braking mode of the LDC system when the high voltage battery enters the charging limit (S721).

Thereafter, the regenerative braking control device of the vehicle determines whether or not it is a coasting driving situation, and if it is a coasting driving situation (S722), controls to enter the regenerative braking mode of the LDC system (S723). At this time, the regenerative braking control device of the vehicle maintains the state of entering the regenerative braking mode of the LDC system until the coasting operation ends, and controls the regenerative braking mode of the LDC system to be released when the coasting operation ends (S724). Do (S725).

9 illustrates a regenerative braking mode control operation of the LDC system according to brake braking situations.

In step 'S714' of FIG. 7 , when the slope of the road is not a downhill slope, the regenerative braking control device of the vehicle performs operations after 'B' of FIG. 9 .

Accordingly, as shown in FIG. 9 , the regenerative braking control device of the vehicle, when the motor power of the vehicle becomes less than the first set value due to brake braking while driving on a flat terrain (S731), the regenerative braking control device of the vehicle LDC Control to enter the regenerative braking mode of the system (S732). At this time, the regenerative braking control device of the vehicle maintains the regenerative braking mode entry state of the LDC system until the brake braking is completed and acceleration is started.

Thereafter, when the motor power of the vehicle exceeds the second set value due to acceleration (S733), the regenerative braking control device of the vehicle may release the regenerative braking mode of the LDC system (S734).

10 is a diagram illustrating a computing system on which a method according to an embodiment of the present invention is executed.

Referring to FIG. 10 , a computing system 1000 includes at least one processor 1100, a memory 1300, a user interface input device 1400, a user interface output device 1500, and a storage connected through a bus 1200. 1600, and a network interface 1700.

The processor 1100 may be a central processing unit (CPU) or a semiconductor device that processes commands stored in the memory 1300 and/or the storage 1600 . The memory 1300 and the storage 1600 may include various types of volatile or nonvolatile storage media. For example, the memory 1300 may include read only memory (ROM) and random access memory (RAM).

Accordingly, the steps of a method or algorithm described in connection with the embodiments disclosed herein may be directly implemented as hardware executed by the processor 1100, a software module, or a combination of the two. A software module resides in a storage medium (i.e., memory 1300 and/or storage 1600) such as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM. You may. An exemplary storage medium is coupled to the processor 1100, and the processor 1100 can read information from and write information to the storage medium. Alternatively, the storage medium may be integral with the processor 1100. The processor and storage medium may reside within an application specific integrated circuit (ASIC). An ASIC may reside within a user terminal. Alternatively, the processor and storage medium may reside as separate components within a user terminal.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

10: interface unit 20: communication unit
30: storage unit 100: regenerative braking control device
110: control unit 120: information collection unit
130: creep power calculation unit 140: setting unit
150: mode control

Claims (19)

an information collection unit that collects driving information of the vehicle;
a creep power calculating unit calculating creep power based on creep torque among the collected driving information of the vehicle;
When controlling the variable voltage of the low voltage DC-DC converter system, the mode entry setting value of the regenerative braking mode according to the driving situation of the vehicle based on the calculated creep power and the default value of the motor power of the vehicle, and a setting unit for setting a mode release setting value; and
The mode control unit controls entry or release of the regenerative braking mode based on the mode entry setting value and the mode exit setting value according to the vehicle's driving situation and the motor power of the vehicle.
including,
The setting unit,
A vehicle characterized in that the mode entry setting value is set to a first setting value and the mode release setting value is set to a second setting value based on the calculated creep power during flatland coasting driving or brake braking. regenerative braking control device. delete The method of claim 1,
The first set value is,
A value obtained by adding a first mapping constant to the calculated creep power;
The second set value is,
Regenerative braking control device for a vehicle, characterized in that the default value of the motor power. The method of claim 1,
The mode controller,
When the motor power of the vehicle is less than the first set value in the regenerative braking mode release state during flatland coasting driving or brake braking, the vehicle enters the regenerative braking mode, and in the regenerative braking mode entry state, the motor power reaches the second set value. A regenerative braking control device for a vehicle, characterized in that for controlling the regenerative braking mode to be released when the value is exceeded. The method of claim 1,
The setting unit,
The regenerative braking control device for a vehicle, characterized in that the mode entry setting value is variably set to a first variable setting value and the mode release setting value is variably set to a second variable setting value during steel coasting driving. The method of claim 5,
The first variable set value is,
is the default value of the motor power,
The second variable set value is,
The regenerative braking control device of a vehicle, characterized in that the value obtained by adding the second mapping constant to the default value of the motor power. The method of claim 5,
The mode controller,
During steel coasting driving, if the motor power of the vehicle is less than the first variable set value in the regenerative braking mode release state, the vehicle enters the regenerative braking mode, and in the regenerative braking mode entry state, the motor power exceeds the second variable set value. A regenerative braking control device for a vehicle, characterized in that it controls so that the regenerative braking mode is released when it exceeds. The method of claim 5,
The setting unit,
Reset the mode entry setting value and the mode release setting value to the first setting value and the second setting value at the end of the steel plate coasting run,
The mode controller,
The regenerative braking control device of a vehicle, characterized in that in the regenerative braking mode entry state, control is maintained so that the regenerative braking mode entry state is maintained when the motor power does not exceed the second set value when the steel plate coasting driving ends. The method of claim 1,
The mode controller,
A regenerative braking control device for a vehicle, characterized in that it controls to enter a regenerative braking mode when charging of the high-voltage battery is limited, and to release the regenerative braking mode when the charging restriction of the high-voltage battery is lifted. The method of claim 1,
The default value of the motor power is,
A regenerative braking control device for a vehicle, characterized in that 0 [kW]. The method of claim 1,
The information collection unit,
Collecting at least one of the braking state information of the vehicle, the charging limit information of the high voltage battery, the SOC information of the low voltage battery, the coasting driving information, the slope of the road, the vehicle speed and creep torque information. Vehicle regenerative braking control device. Collecting driving information of the vehicle;
calculating creep power based on creep torque among the collected driving information of the vehicle;
When controlling the variable voltage of the low voltage DC-DC converter system, the mode entry setting value of the regenerative braking mode according to the driving situation of the vehicle based on the calculated creep power and the default value of the motor power of the vehicle, and setting a mode release setting value; and
Controlling entry or release of a regenerative braking mode based on a mode entry setting value and a mode exit setting value according to driving conditions of the vehicle and motor power of the vehicle
including,
In the setting step,
Setting the mode entry setting value as a first setting value and setting the mode release setting value as a second setting value based on the calculated creep power during flatland coasting driving or brake braking A method for controlling regenerative braking of a vehicle. delete The method of claim 12,
The step of controlling entry or release of the regenerative braking mode,
Controlling to enter a regenerative braking mode when motor power of the vehicle is less than the first set value in a regenerative braking mode release state during flatland coasting or braking; and
and controlling the regenerative braking mode to be released when the motor power exceeds the second set value in a regenerative braking mode entry state. The method of claim 12,
In the setting step,
The regenerative braking of the vehicle further comprising the step of variably setting the mode entry setting value to a first variable setting value and the mode release setting value to a second variable setting value when driving on a steel plate coasting. control method. The method of claim 15
The step of controlling entry or release of the regenerative braking mode,
Controlling to enter a regenerative braking mode when motor power of the vehicle is less than the first variable set value in a regenerative braking mode release state during steel coasting driving; and
and controlling the regenerative braking mode to be released when the motor power exceeds the second variable set value in a regenerative braking mode entry state. The method of claim 15
resetting the mode entry setting value and the mode release setting value to the first setting value and the second setting value when the steel plate coasting driving ends; and
Regenerative braking of the vehicle, characterized in that it further comprises the step of controlling so that the regenerative braking mode entry state is maintained when the motor power does not exceed the second set value when the steel plate coasting driving ends in the regenerative braking mode entry state. control method. The method of claim 12,
The step of controlling entry or release of the regenerative braking mode,
Controlling to enter a regenerative braking mode when charging of the high voltage battery is limited; and
and controlling the regenerative braking mode to be released when the charging restriction of the high voltage battery is released. a communication unit configured to receive driving information of the vehicle from at least one of an in-vehicle brake system, a battery management system, a driving control system, and one or more sensors collecting driving information of the vehicle;
The creep power of the vehicle is calculated by collecting driving information of the vehicle received through the communication unit, and the calculated creep power and the motor power of the vehicle are used when controlling the variable voltage of the low voltage DC-DC converter system. By setting the mode entry setting value and mode release setting value of the regenerative braking mode according to the driving situation of the vehicle based on the default value of a regenerative braking control device that controls entry or release of a regenerative braking mode based on motor power; and
An interface unit outputting operation information of the regenerative braking control device
including,
The regenerative braking control device,
A vehicle characterized in that the mode entry setting value is set to a first setting value and the mode release setting value is set to a second setting value based on the calculated creep power during flatland coasting driving or brake braking. system.

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