KR20200016560A - Hybrid vehicle and method of driving control for the same - Google Patents

Abstract

The present invention relates to a hybrid vehicle and a method of driving mode control for the same and, more specifically, to a hybrid vehicle and a control method thereof which consider a specific area where exhaust gas emission reduction is recommended or compelled to determine a driving mode. According to an embodiment of the present invention, the method of driving control of a hybrid vehicle comprises: a step of determining whether a current location corresponds to a specific area associated with exhaust gas emission; a step of determining a condition for first mode driving using only an electric motor when the current location corresponds to the specific area; a step of controlling a powertrain to perform the first mode driving if the first mode driving is possible as a result of determining the condition; and a step of outputting information indicating that the first mode driving is performed by entering the specific area.

Description

HYBRID VEHICLE AND METHOD OF DRIVING CONTROL FOR THE SAME

The present invention relates to a hybrid vehicle and a driving mode control method therefor, and more particularly, to a hybrid vehicle and a control method thereof capable of determining a driving mode in consideration of a specific region in which emission reduction is recommended or forced.

A hybrid electric vehicle (HEV) is a vehicle that generally uses two power sources together. The two power sources are mainly an engine and an electric motor. Such hybrid vehicles have been developed in recent years because they are superior in fuel efficiency and superior in power performance as well as in reducing exhaust gas, compared to a vehicle having only an internal combustion engine.

Such a hybrid vehicle may operate in two driving modes depending on which power train is driven. One of them is an electric vehicle (EV) mode that runs only with an electric motor, and the other is a hybrid electric vehicle (HEV) mode that operates by driving an electric motor and an engine together. Hybrid cars switch between the two modes depending on conditions while driving.

Such switching between driving modes is generally performed for the purpose of maximizing fuel efficiency or driving efficiency, depending on the efficiency characteristics of the powertrain. As a result, the control schemes for switching between driving modes are focused only on efficiency in the operation of the green vehicle, which is far from the ultimate goal for the green vehicle to move forward.

Of course, there may be considered a method of forcibly driving in the EV mode according to the driver's selection in a specific section by providing a manual mode change button, but this method is less convenient and travels in the EV mode where the emission reduction is desirable. There is a problem that it is difficult to secure the SOC necessary to do so in advance.

Accordingly, there is a demand for a method capable of preventing engine starting without a user's separate operation based on a driving position in an area where emission reduction of exhaust gas is required.

The present invention is to provide a method of suppressing engine starting in consideration of the vehicle state and position, and a hybrid vehicle performing the same.

In particular, the present invention is to provide a method for determining the driving mode in consideration of the vehicle condition, road surface conditions and the driver's will when the location of the vehicle is an area that is not suitable for engine starting, and the vehicle performing the same.

Technical problems to be achieved in the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

In order to solve the above technical problem, the driving control method of a hybrid vehicle according to an embodiment of the present invention, determining whether the current location corresponds to a specific region associated with the exhaust gas emissions; Determining a condition for driving the first mode using only an electric motor when the operation corresponds to the specific region; Controlling the power train to perform the first mode driving when the first mode driving is possible as a result of the determination of the condition; And outputting information indicating that the first mode driving is performed by entering the specific region.

In addition, the hybrid vehicle according to an embodiment of the present invention, the recognition unit for determining whether the current location corresponds to a specific area associated with the exhaust gas emissions; A mode determination unit determining whether to enter the first mode according to a condition for entry into the first mode using only an electric motor, when the recognition unit determines that it corresponds to the specific region; And when the mode determining unit determines to enter the first mode, performs a control to control a power train to perform the first mode driving and to output information indicating that the first mode driving is performed by entering the specific region. It may include wealth.

The hybrid vehicle according to at least one embodiment of the present invention configured as described above may perform engine start or engine start suppression in consideration of the vehicle state and position.

In particular, when the location of the vehicle is an area that is not suitable for starting the engine, the driving mode may be determined in consideration of the vehicle condition, the road surface situation, and the driver's will.

Effects obtained in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

1 is a view for explaining the concept of a specific area to which embodiments of the present invention can be applied.
2 shows an example of a power train structure of a hybrid vehicle to which embodiments of the present invention can be applied.
3 is a block diagram illustrating an example of a control system of a hybrid vehicle to which embodiments of the present invention can be applied.
4 is a block diagram illustrating an example of a hybrid vehicle structure for performing green zone determination and driving mode determination according to an embodiment of the present invention.
5 is a flowchart illustrating an example of a driving mode control process according to whether a green zone is entered according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it may further include other components, except to exclude other components unless specifically stated otherwise. In addition, parts denoted by the same reference numerals throughout the specification means the same components.

According to embodiments of the present invention, when entering an area affected by exhaust gas emissions, a method of controlling a driving mode in consideration of a vehicle condition, a road surface condition, and a driver's will, and a hybrid vehicle for performing the same. Suggest.

Prior to describing a driving mode control method according to an exemplary embodiment of the present invention, a structure and a control system of a hybrid vehicle applicable to the concept and embodiments of a region affected by exhaust gas emissions will be described first.

First, with reference to FIG. 1, the concept of the area where engine operation should be suppressed will be described. 1 is a view for explaining the concept of a specific area to which embodiments of the present invention can be applied.

Referring to FIG. 1, in the embodiments of the present invention, it is assumed that a specific region 30 is required between the destination 10 and the destination 20 in which emission reduction or emission restriction is required. The specific area 30 may be a predetermined area or may be variably set according to the current / recent situation. In this case, the preset case may be a region (for example, an emission management region such as London or Seoul) set by a law or a government policy, or an area (eg, child protection) that requires emission reduction due to regional characteristics. Areas, indoor car parks, residential areas, etc.). In addition, the area that is set variably refers to an area where the current setting can be confirmed through wireless information such as telematics, and a pedestrian dense area determined by an image information (vision) system (ADAS system, etc.) provided in the vehicle. And the like may correspond to this. For example, if it is determined that the area where pedestrians are concentrated based on big data based on the location information of the smartphone, it is estimated that a large amount of emission gas is generated based on the average speed and traffic volume collected through the telematics service. This particular area 30 may be set.

The specific area 30 may be set in any administrative area unit, or may be set as an area connecting a plurality of coordinates which are boundary points, and set as an area within a certain radius of a specific facility itself / part of or a specific facility / coordinate. May be

Of course, the above-described setting example of the specific region is exemplary, and the present invention is not limited by the setting criteria, setting range, setting period, etc. of the specific region. In addition, it is assumed that a particular region 30 is located between the origin 10 and the destination 20, but the destination 20 must be explicitly provided by the user on the navigation function of the AVN (Audio / Video / Navigation) system. It is not required to be set. For example, the destination 20 may be arbitrarily set in the vehicle according to the driver's driving pattern or preset driving conditions (time, area, etc.). The presence and range of the specific area 30 in the path may be acquired by the vehicle before entering the area, or may be dynamically recognized according to the surrounding situation.

More specifically, the method of determining the specific region 30 will be described later with reference to FIG. 4. In the following description, for convenience, a specific area where exhaust gas reduction / emission prohibition is required will be referred to as a "green zone".

Next, a hybrid vehicle structure to which embodiments of the present invention can be applied will be described with reference to FIG. 2. 2 shows an example of a power train structure of a hybrid vehicle to which embodiments of the present invention can be applied.

Referring to FIG. 2, an electric motor (or driving motor 140) and an engine clutch (EC) 130 are mounted between an internal combustion engine engine ICE 110 and a transmission 150 in parallel. A power train of a hybrid vehicle employing a hybrid system is shown.

In such a vehicle, in general, when the driver steps on the accelerator after starting, the motor 140 is first driven using the power of the battery in the state where the engine clutch 130 is opened, and the power of the motor is transmitted to the transmission 150 and the sub-decelerator. The wheel moves through (FD: Final Drive, 160) (ie EV mode). When the vehicle is gradually accelerated and needs a larger driving force, the auxiliary motor (or the start generation motor 120) may operate to drive the engine 110.

Accordingly, when the rotation speeds of the engine 110 and the motor 140 are the same, the engine clutch 130 is engaged with the engine 110 and the motor 140 together, or the engine 110 drives the vehicle (that is, the engine 110). , Transition from HE mode to HEV mode). When the preset engine off condition is satisfied that the vehicle is decelerated, the engine clutch 130 is opened and the engine 110 is stopped (ie, the EV mode transition in the HEV mode). In addition, in a hybrid vehicle, the driving force of the wheel may be converted into electric energy during braking to charge the battery, which is referred to as braking energy regeneration or regenerative braking.

The starting generation motor 120 serves as a start motor when the engine is started, and operates as a generator after starting the engine or recovering rotational energy of the engine when the engine is turned off, and thus, "hybrid start generator (HSG: Hybrid Start). Generator ", and in some cases, may be referred to as" auxiliary motor ".

The interrelationship between the controllers in a vehicle to which the above-described power train is applied is shown in FIG. 3.

3 is a block diagram illustrating an example of a control system of a hybrid vehicle to which embodiments of the present invention can be applied.

Referring to FIG. 3, in a hybrid vehicle to which embodiments of the present invention may be applied, the internal combustion engine 110 is controlled by the engine controller 210, and the start-generation motor 120 and the electric motor 140 are motor controllers (MCUs). : Torque may be controlled by the Motor Control Unit 220, and the engine clutch 130 may be controlled by the clutch controller 230, respectively. The engine controller 210 may be an engine control system (EMS). In addition, the transmission 150 is controlled by the transmission controller 250. In some cases, a controller for each of the start-up motor 120 and the controller for the electric motor 140 may be provided separately.

Each controller is connected to a Hybrid Controller Unit (HCU) that controls the overall mode switching process as its upper controller, and is required for changing the driving mode and controlling the engine clutch when shifting gears under the control of the hybrid controller 240. Information and / or information necessary for engine stop control may be provided to the 240 or an operation according to a control signal.

More specifically, the hybrid controller 240 determines whether to perform mode switching according to the driving state of the vehicle. For example, the hybrid controller determines the release time of the engine clutch 130 and performs hydraulic pressure (when wet EC) control or torque capacity control (when dry EC) at the time of release. In addition, the hybrid controller 240 may determine the state of the EC (Lock-up, Slip, Open, etc.) and control the fuel injection stop point of the engine 110. In addition, the hybrid controller may transmit the torque command for controlling the torque of the start-up motor 120 to the motor controller 220 to control the engine rotation energy recovery for engine stop control. In addition, the hybrid controller 240 may control the lower controller for determining and switching the mode switching condition during the driving mode switching control.

Of course, it is apparent to those skilled in the art that the above-described control period connection relationship and the function / division of each controller are exemplary and not limited to the names thereof. For example, the hybrid controller 240 may be implemented so that the corresponding function is provided in place of one of the other controllers except that, or the function may be distributed in two or more of the other controllers.

Hereinafter, a vehicle configuration for determining a green zone in a hybrid vehicle according to an embodiment and determining a driving mode according to various conditions when determining to enter a green zone, which will be described later, will be described.

4 is a block diagram illustrating an example of a hybrid vehicle structure for performing green zone determination and driving mode determination according to an embodiment of the present invention.

Referring to FIG. 4, the hybrid vehicle 300 according to the present embodiment may include a green zone recognition unit 310, a mode determination unit 320, and a control execution unit 330.

The green zone recognition unit 310 may include an image recognition unit 311 performing image recognition, a GPS receiver 313 for obtaining current location information, a map database 315 for storing map information, and a navigation system 317. And a green zone determination unit 319.

The image recognition unit 311 may include at least one image acquisition device such as a camera, and may acquire an image around the vehicle. The acquired image is processed through feature extraction, sign recognition, object recognition, etc. to determine whether the current location is indoor or outdoor, whether the location corresponds to the green zone such as parking lot, park, drive through, hospital, and population density. You can judge.

The GPS receiver 313 may include at least one GPS module to acquire current location information of the vehicle, and transmit the current location information to the navigation system.

The map database 315 stores map information and may store information such as road type, slope, distance information, green zone setting information, and the like.

The navigation system 317 applies the location information transmitted from the GPS receiver 313 to the map information of the map database 315 to determine whether the current location corresponds to the green zone set in the map information and the driving route when the destination is input. It is possible to determine whether there is a green zone positioned on the top, the location of the green zone, the length of the green zone, the topographical characteristics of the green zone, and the like.

The green zone determination unit 319 may finally determine whether the current location corresponds to the green zone by combining the information acquired by the image recognition unit 311 and the navigation system 317.

When the green zone determination unit 319 determines that the current position corresponds to the green zone, the mode determination unit 320 determines whether the EV mode is driven according to at least one of the vehicle state, the road surface state, and the driver's will (required driving force, etc.). You can decide.

The control performing unit 330 may include a mode display unit 331 and a driving control unit 333, and the mode display unit 331 may output the driving mode corresponding to the determination result of the mode determination unit 320 in a predetermined form. Can be. In addition, the driving controller 333 may control the power train in a driving mode corresponding to the determination result of the mode determination unit 320.

For example, the determination and operation forms of the mode determiner 320 and the control performer 330 may be summarized as shown in Table 1 below.

Green Zone Judgment Mode judgment Take control Vehicle location Judgment condition EV status Powertrain control Display status Not Green Zone Default judgment Default judgment Default control Default display Green zone Low SOC
Overtaking acceleration
High demand power Not entering HEV mode control Display without EV mode by green zone Green zone Normal SOC
Required power below the maximum motor output enter EV mode control By Green Zone
EV mode application indication

Details of the matters summarized in Table 1 are as follows.

First, when not in the green zone, the mode determination unit 320 and the control execution unit 330 may switch between the EV mode and the HEV mode according to a default setting (for example, a criterion for satisfying fuel economy and power demand). .

In contrast, when the current position corresponds to the green zone, the mode determination unit 320 determines whether to enter the EV mode in consideration of determination conditions such as a vehicle state, a road surface state, and a driver's intention. This is because even if the current location is a green zone, it may not be possible to enter the EV mode when the system needs to be protected.

For example, when the state of charge (SOC) of the high-voltage battery driving the electric motor 140 is low in the vehicle state, the EV mode cannot be entered, and thus, the EV mode is only entered when the SOC value is higher than or equal to a predetermined SOC value that can be viewed as a normal state. May be allowed to enter.

As another example, when at least one of the electric motor and the high voltage battery is overheated, an additional power limitation may occur when driving the continuous EV mode, and there is a risk of damage, so that the EV mode is only available when the temperature of the corresponding component is in the normal temperature range. Entry into the furnace may be allowed.

In addition, in a road surface state, such as a sudden inclination may be difficult to drive only by the output of the electric motor 140, and the sudden SOC is expected to drop during continuous driving, it may be allowed to enter the EV mode only when the inclination is less than the preset value. have.

In addition, at the driver's will, a rapid acceleration (eg, full APS) for avoiding or overtaking a dangerous situation is required, or a required power that exceeds the maximum output of the electric motor 140 is generated to drive in accordance with traffic flow. In this case, entry into the EV mode may be restricted.

Next, an operation of the control execution unit 330 in the green zone will be described.

When the mode determination unit 320 determines to enter the EV mode, the driving controller 333 may control the power train to the EV mode, and the mode display unit 331 may indicate that the mode is changed to the EV mode because the green zone has been entered. May be output.

On the contrary, when the mode determining unit 320 determines not to enter the EV mode, the driving controller 333 may control the power train to the HEV mode, and the mode display unit 331 enters the green zone but does not switch to the EV mode. Information indicating no can be output.

According to an aspect of the present embodiment, the image recognition unit 311 may use an image acquisition means provided in the advanced driving assistance apparatus (ADAS), or may be implemented in a form included in the ADAS.

In addition, according to an aspect of the present embodiment, the navigation system 317 may be implemented in the form of an AVN (Audio / Video / Navigation) system.

In addition, according to an aspect of the present embodiment, the green zone determination unit 319 may be implemented as a controller separate from the AVN system, or may be implemented in a form included in the AVN system. When implemented as a separate controller, the green zone determination unit 319 may be a hybrid controller, but is not necessarily limited thereto. When the green zone determination unit 319 is a hybrid controller, the hybrid controller determines energy required to drive the green zone in the EV mode, chargeable amount before entering the green zone, and the like based on the information obtained from the above-described components. Accordingly, it is possible to determine whether to bypass the green zone or to select a path in case of detour, and provide the determination result to the navigation system 317 so that the navigation system can reset the path. In addition, the hybrid controller may control driving of the HEV mode so that battery charging is performed before entering the green zone, and controlling driving of the EV mode when entering the green zone.

In addition, according to an aspect of the present embodiment, the green zone determination unit 319 weights any one when the recognition result of the image recognition unit 311 and the recognition result of the navigation system 317 are different in determining the final green zone. Or may be finally determined that the current position is the green zone only when the recognition result is the same as the green zone.

In addition, according to an aspect of the present embodiment, the image recognizing unit 311 provides the green zone determination unit 319 with the acquired image or image processing result, and whether the green zone determination unit 319 is a green zone. It may be implemented to determine whether the green zone is performed using the transferred image. In addition, according to an aspect of the present embodiment, the driver may directly input the current region corresponding to the green zone in a command form through a predetermined button operation or menu operation.

In addition, according to an aspect of the present embodiment, the mode determining unit 320 and the driving control unit 333 may be implemented as a hybrid controller, and the mode display unit 331 may be a display of a cluster or an AVN system, but is not limited thereto. It is not.

The above-described operation is shown in FIG. 5.

5 is a flowchart illustrating an example of a driving mode control process according to whether a green zone is entered according to an embodiment of the present invention.

Referring to FIG. 5, first, through image recognition 510 and map recognition 520, it may be determined whether a current location corresponds to a green zone (S530). Here, the order of the image recognition step 510 and the map recognition 520 may be reversed or may be simultaneously performed.

When the current position does not correspond to the green zone (No in S540), mode control according to a default setting may be performed, and the current driving mode may be displayed according to the operation (S550).

In contrast, when the current position corresponds to the green zone (Yes in S540), the EV mode entry condition in the green zone may be determined, such as a system / vehicle state, a road surface state, and a driver's will (S560).

If it is determined to enter the EV mode according to the determination result (Yes in S570), information indicating the EV mode entry by the green zone is displayed (S580) and the power train may be controlled to the EV mode.

On the contrary, when it is determined that entry into the EV mode is not allowed according to the determination result (No in S570), information indicating that the green zone is entered but not the EV mode is displayed (S590) and the power train is HEV. Can be controlled in mode.

Therefore, in the case of general HEV, only forced EV mode switching by manual operation of the EV button when entering the green zone was possible, but according to the present embodiment, the green zone is automatically recognized by using map information and vision information, Therefore, by providing the EV mode automatically, it provides convenience to the driver and environmental protection through emission reduction.

The present invention described above can be embodied as computer readable codes on a medium on which a program is recorded. The computer readable medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable media include hard disk drives (HDDs), solid state disks (SSDs), silicon disk drives (SDDs), ROMs, RAMs, CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and the like. There is this.

Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

Claims (19)

In the traveling control method of a hybrid vehicle,
Determining whether the current location corresponds to a specific region associated with exhaust gas emission;
Determining a condition for driving the first mode using only an electric motor when the operation corresponds to the specific region;
Controlling the power train to perform the first mode driving when the first mode driving is possible as a result of the determination of the condition; And
And outputting information indicating that the first mode driving is performed by entering the specific area. According to claim 1,
The condition is
And at least one of a current vehicle state, a road surface state currently being driven, and a driver's will. The method of claim 2,
The current vehicle state is,
And a state of charge of a battery (SOC), and whether the battery and the electric motor are overheated. The method of claim 2,
The road surface state,
Running control method of a hybrid vehicle, including the slope of the road surface currently running. The method of claim 2,
The driver will
A traveling control method for a hybrid vehicle, including a required power by the driver's operation. According to claim 1,
Controlling the power train to perform at least a second mode driving using an engine when the first mode driving is impossible as a result of the determination of the condition; And
And outputting information indicating that the specific mode is entered but the first mode driving is not performed. According to claim 1,
Determining whether it corresponds to the specific region,
The driving control method of the hybrid vehicle, which is performed through at least one of image recognition and map recognition. According to claim 1,
And determining that the vehicle corresponds to the specific region, and if not corresponding to the specific region, performing driving mode control based on a preset criterion in consideration of fuel consumption and required power. According to claim 1,
The specific area,
And a region in which the exhaust emission reduction is forced or recommended. A computer-readable recording medium storing a program for executing the traveling control method of a hybrid vehicle according to any one of claims 1 to 9. In a hybrid car,
Recognizing unit for determining whether the current location corresponds to a specific region associated with the exhaust gas emissions;
A mode determination unit determining whether to enter the first mode according to a condition for entry into the first mode using only an electric motor, when the recognition unit determines that it corresponds to the specific region; And
When the mode determiner determines to enter the first mode, the control unit controls the power train to perform the first mode driving and outputs information indicating that the first mode driving is performed by entering the specific region. Including, hybrid cars. The method of claim 11, wherein
The condition is
And at least one of a current vehicle condition, a road surface condition currently being driven, and a driver's will. The method of claim 12,
The current vehicle state is,
Hybrid vehicle, including the state of charge (SOC) of the battery, the battery and the electric motor is over temperature. The method of claim 12,
The road surface state,
Hybrid vehicle, including the slope of the road surface currently running. The method of claim 12,
The driver will
A hybrid vehicle, which includes the required power by the driver's operation. The method of claim 11, wherein
If it is determined by the mode determination unit that the entry of the first mode is impossible,
The control execution unit,
And controlling the power train to perform at least a second mode travel using the engine and output information indicating that the particular mode has been entered but the first mode travel is not performed. The method of claim 11, wherein
The recognition unit,
And at least one of an image recognition unit and a navigation system. The method of claim 11, wherein
If it is determined that the recognition unit does not correspond to the specific area,
The control execution unit,
A hybrid vehicle which performs driving mode control according to a predetermined criterion in consideration of fuel consumption and power demand. The method of claim 11, wherein
The specific area,
A hybrid vehicle, comprising an area in which the emission reduction is forced or recommended.

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