Device and method for controlling an engine including an electric supercharger

Abstract

The present invention relates to a device for controlling an engine including an electric supercharger and a method thereof. A device for controlling an engine including an electric supercharger comprises: an engine that burns fuel to generate power; a drive motor that assists the power of the engine and selectively acts as a generator to generate electric energy; a battery configured to supply electric energy to the drive motor and to be charged by the electric energy generated from the drive motor; a plurality of electric superchargers, respectively installed in a plurality of intake lines through which ambient air flows to be supplied to a combustion chamber of the engine; and a controller that adjusts the target speed of the electric superchargers of the plurality of electric superchargers, determines the driving mode of the electric superchargers, limits the maximum output of the engine, and variably adjusts the SOC power generation area of ​​the engine to charge the battery based on the determined driving tendency.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2019-0148924, filed on November 19, 2019, which is hereby incorporated by reference in its entirety. Technical Field

[0003] The present disclosure relates to an apparatus for controlling an engine including an electric supercharger. Background Art

[0004] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0005] A hybrid vehicle is a vehicle that uses two or more power sources, and generally refers to a hybrid electric vehicle that is driven using an engine and a motor. A hybrid electric vehicle can be formed in various structures using two or more power sources including an engine and a motor.

[0006] Generally, a hybrid electric vehicle uses a powertrain in the form of a transmission mounted electronic device (TMED) in which a drive motor, a transmission, and a drive shaft are connected to each other in series.

[0007] In addition, a clutch is provided between the engine and the motor, and the hybrid electric vehicle is driven in an electric vehicle (EV) mode or a hybrid electric vehicle (HEV) mode depending on whether the clutch is engaged.

[0008] The EV mode is a mode in which the vehicle is driven only by the driving torque of the driving motor, and the HEV mode is a mode in which the vehicle is driven by the driving torque of the driving motor and the engine.

[0009] In hybrid vehicles, it is very important to manage the state of charge (SOC), which is the charge level of the battery that provides power to the drive motor and electrical components provided in the vehicle.

[0010] When the battery SOC is low and the vehicle is traveling only by the output power of the engine without the assistance of the drive motor, when a high driving load of the vehicle is expected (for example, ultra-high-speed driving conditions, continuous climbing driving conditions, high-altitude driving conditions, etc.), the driving speed may deteriorate due to the excessively required output and the high engine speed of the engine, and the fuel efficiency and exhaust may deteriorate.

[0011] On the other hand, customer satisfaction with the vehicle's driving performance depends on how closely the vehicle matches the customer's driving tendencies. Although customer tendencies may vary, since a single vehicle type generally has only a single vehicle performance feature, a difference may occur between the customer's driving tendencies and the vehicle's response. Therefore, customers often complain about the vehicle's driving performance. That is, by grasping the customer's driving tendencies and controlling the gear shift so that the vehicle responds appropriately to the customer's driving tendencies, customer satisfaction with the driving performance can be maximized.

[0012] However, we have found that it may be difficult to stably maintain the battery SOC regardless of the driver's driving tendency. For example, although the drive motor should assist the engine output to meet the driving tendency of a sporty driver, there is a limit to increasing the output power of the drive motor when the battery SOC is low.

[0013] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0014] The present disclosure provides an apparatus for controlling an engine including an electric supercharger based on a driver's tendency and a method thereof, which have advantages of ensuring the driving performance of a vehicle having an engine system including an electric supercharger and stably managing the SOC of a battery.

[0015] An apparatus for controlling an engine including an electric supercharger based on a driver's tendency comprises: an engine configured to burn fuel to generate power; a drive motor configured to assist the power of the engine and selectively function as a generator to generate electric energy; a battery configured to supply electric energy to the drive motor and to be charged by the electric energy generated from the drive motor; a plurality of electric superchargers respectively installed in a plurality of intake lines through which ambient air flows to be supplied to a combustion chamber of the engine; and a controller that adjusts a target speed of an electric supercharger among the plurality of superchargers, determines a drive mode of the electric supercharger, limits a maximum output of the engine, and variably adjusts a state of charge (SOC) power generation region in which the engine charges the battery, based on a determined driving tendency of the driver.

[0016] The controller may adjust the target speed by adjusting the magnitude of the gain of the speed filter applied to the target speed of the electric superchargers of the plurality of superchargers in different ways based on the driving tendency of the driver.

[0017] In one form, the driving tendency can be divided into a sport tendency, a normal tendency, and a mild tendency. When the driver's driving tendency is a sport tendency, the controller can apply a maximum value to the magnitude of the gain. When the driving tendency is a mild tendency, the controller can apply a minimum value to the magnitude of the gain. When the driving tendency is a normal tendency, the controller can determine the magnitude of the gain to be a value between the maximum value and the minimum value.

[0018] The controller may adjust the target speed by changing a speed change rate of the target speed applied to the electric supercharger based on the driving tendency of the driver.

[0019] In another form, when the driver's driving tendency is a sport tendency, the controller may set the slope of the speed change rate applied to the target speed to a maximum value. When the driving tendency is a gentle tendency, the controller may set the slope of the speed change rate applied to the target speed to a minimum value. When the driving tendency is a normal tendency, the controller may set the slope of the speed change rate applied to the target speed to a value between the maximum value and the minimum value.

[0020] In other forms, when the driver's driving tendency is a sporty tendency, the controller may set the engine to output a maximum torque. When the driving tendency is a normal tendency, the controller may set the engine to output an intermediate torque less than the maximum torque. When the driving tendency is a gentle tendency, the controller may set the engine to output a minimum torque less than the intermediate torque.

[0021] In some forms of the present disclosure, the driver's driving tendency may be classified into a sport tendency, a normal tendency, and a gentle tendency. The SOC power generation region may correspond to a region covering an SOC start value at which the engine starts charging the battery to an SOC end value at which the engine completes charging the battery.

[0022] When the driver's driving tendency is a gentle tendency, the controller may set the SOC start value to the SOC minimum value in the SOC low area, and set the SOC end value to the SOC minimum value in the SOC normal area. When the driving tendency is a sporty tendency, the controller may set the SOC start value to the SOC maximum value in the SOC low area, and set the SOC end value to the SOC maximum value in the SOC normal area. When the driving tendency is a normal tendency, the controller may set the SOC start value to the SOC intermediate value between the SOC minimum value in the SOC low area and the SOC maximum value in the SOC normal area, and set the SOC end value to the SOC intermediate value between the SOC minimum value in the SOC normal area and the SOC maximum value in the SOC normal area.

[0023] An exemplary method of controlling an engine including an electric supercharger includes: determining, by a controller, a driving tendency of a driver; adjusting, by the controller, target speeds of a plurality of electric superchargers based on the determined driving tendency; determining, by the controller, a driving mode of the plurality of electric superchargers based on the determined driving tendency; and variably adjusting, by the controller, a state of charge (SOC) power generation region in which the engine charges a battery based on the determined driving tendency.

[0024] In adjusting the target speed, the target speed may be adjusted by adjusting the magnitudes of the gains of the speed filters applied to the target speeds of the plurality of electric superchargers in different ways, according to the determined driving tendency of the driver.

[0025] The determined driving tendency of the driver may be divided into a sport tendency, a normal tendency, and a gentle tendency. When the determined driving tendency is a sport tendency, a maximum value may be applied to the magnitude of the gain. When the determined driving tendency is a gentle tendency, a minimum value may be applied to the magnitude of the gain. When the determined driving tendency is a normal tendency, the magnitude of the gain may be determined as a value between the maximum value and the minimum value.

[0026] When adjusting the target speed, the target speed may be adjusted by changing the magnitude of the speed change rate of the target speed applied to the plurality of electric superchargers according to the determined driving tendency of the driver.

[0027] The determined driving tendency of the driver may be divided into a sport tendency, a normal tendency, and a gentle tendency. When the determined driving tendency is a sport tendency, the slope of the speed change rate applied to the target speed may be set to a maximum value. When the determined driving tendency is a gentle tendency, the slope of the speed change rate applied to the target speed may be set to a minimum value. When the determined driving tendency is a normal tendency, the slope of the speed change rate applied to the target speed may be set to a value between the maximum value and the minimum value.

[0028] The determined driving tendency of the driver may be divided into a sport tendency, a normal tendency, and a gentle tendency. When the determined driving tendency is a sport tendency, the engine may be set to output a maximum torque. When the determined driving tendency is a normal tendency, the engine may be set to output an intermediate torque less than the maximum torque. When the determined driving tendency is a gentle tendency, the engine may be set to output a minimum torque less than the intermediate torque.

[0029] In other forms, the determined driving tendency of the driver may be classified into a sport tendency, a normal tendency, and a gentle tendency. The SOC power generation area may correspond to an area covering from an SOC start value at which the engine starts charging the battery to an SOC end value at which the engine stops charging the battery.

[0030] When the determined driving tendency is a gentle tendency, the SOC start value may be set to the SOC minimum value in the SOC low region, and the SOC end value may be set to the SOC minimum value in the SOC normal region. When the determined driving tendency is a sporty tendency, the SOC start value may be set to the SOC maximum value in the SOC low region, and the SOC end value may be set to the SOC maximum value in the SOC normal region. When the determined driving tendency is a normal tendency, the SOC start value may be set to the SOC intermediate value between the SOC minimum value in the SOC low region and the SOC maximum value in the SOC normal region, and the SOC end value may be set to the SOC intermediate value between the SOC minimum value in the SOC normal region and the SOC maximum value in the SOC normal region.

[0031] According to an exemplary form of the present disclosure, according to an apparatus and method for controlling an engine including an electric supercharger based on a driver's tendency, the SOC of a battery and the operation of the electric supercharger are controlled by changing the driving characteristics of the engine based on the driver's tendency, thereby achieving improvements in fuel consumption and driving performance of a vehicle at the same time.

[0032] Further areas of applicability will become apparent from the description provided herein.It should be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to make the present disclosure easier to understand, various forms of the present disclosure will now be described by way of example with reference to the accompanying drawings, in which:

[0034] Figure 1 is a schematic diagram of an apparatus for controlling an engine including an electric supercharger based on a driver's tendency according to an exemplary form;

[0035] Figure 2 is a schematic diagram showing a relationship between a hybrid vehicle and an electric supercharger according to an exemplary form of the present disclosure;

[0036] Figure 3 is a block diagram illustrating an apparatus for controlling an engine including an electric supercharger based on a driver's tendency according to an exemplary form of the present disclosure;

[0037] Figure 4 is a schematic diagram showing the SOC region of a battery according to an exemplary form of the present disclosure;

[0038] Figure 5 is a flow chart illustrating a method of controlling an engine including an electric supercharger based on a driver's tendency according to an exemplary form of the present disclosure;

[0039] Figure 6is a graph showing a target speed of an electric supercharger when a gain of a speed filter of the electric supercharger is adjusted according to a tendency of a driver in an apparatus for controlling an engine including an electric supercharger based on a tendency of a driver according to an exemplary form of the present disclosure;

[0040] Figure 7 is a graph showing a target speed of an electric supercharger when a speed change rate of the electric supercharger is adjusted according to a tendency of a driver in an apparatus for controlling an engine including an electric supercharger based on a tendency of a driver according to an exemplary form of the present disclosure;

[0041] Figure 8 is a diagram showing an engine driving point according to a driver's tendency in an apparatus for controlling an engine including an electric supercharger based on a driver's tendency according to an exemplary form of the present disclosure; and

[0042] Fig. 9 is a schematic diagram showing, in an apparatus for controlling an engine including an electric supercharger based on a driver's tendency according to an exemplary form of the present disclosure, a power generation area through the engine according to a driver's tendency.

[0043] The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. DETAILED DESCRIPTION

[0044] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate the same or corresponding parts and features.

[0045] The present disclosure will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary forms of the present disclosure are shown. As will be appreciated by those skilled in the art, the described forms can be modified in various different ways, all without departing from the spirit or scope of the present disclosure.

[0046] The drawings and description are to be regarded as illustrative in nature and not restrictive, and like reference numerals refer to like elements throughout the specification.

[0047] Furthermore, the size and thickness of each element is arbitrarily shown in the drawings, but the present disclosure is not limited thereto, and in the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity.

[0048] Hereinafter, an apparatus for controlling an engine including an electric supercharger based on a driver's tendency and a method thereof according to exemplary forms will be described in detail with reference to the accompanying drawings.

[0049] Figure 1is a schematic diagram of an apparatus for controlling an engine including an electric supercharger based on a driver's tendency according to an exemplary form of the present disclosure. Figure 2 is a schematic diagram showing the relationship between a hybrid vehicle and an electric supercharger according to another exemplary form. Figure 3 is a block diagram illustrating an apparatus for controlling an engine including an electric supercharger based on a driver's tendency according to an exemplary form of the present disclosure.

[0050] Hereinafter, an example of a transmission mounted electronic device (TMED) structure is adopted for a hybrid vehicle according to an exemplary form. However, the scope of the present disclosure is not limited thereto and may be applied to another type of hybrid electric vehicle.

[0051] like Figures 1 to 3 As shown, according to an exemplary form, a hybrid vehicle to which an apparatus for controlling an engine including an electric supercharger based on a driver's tendency is applied may include an engine 10 , an HSG 40 , a drive motor 50 , a clutch 60 , a battery 70 , an accelerator pedal position sensor, and a controller 90 .

[0052] The engine 10 generates power by burning fuel.

[0053] Reference Figure 2 Intake air supplied to the combustion chamber 11 of the engine 10 is supplied through a plurality of intake lines, and exhaust gas exhausted from the combustion chamber 11 of the engine 10 is exhausted through an exhaust manifold 15 and an exhaust line 17. A catalytic converter 19 for purifying exhaust gas is installed in the exhaust line 17.

[0054] The plurality of intake lines may include a first intake line 21 through which ambient air supplied to the combustion chamber 11 flows, and a second intake line 22 through which ambient air supplied to the combustion chamber 11 flows. However, the scope of the present disclosure is not limited thereto.

[0055] A connection line 23 connecting the first intake line 21 and the second intake line 22 is installed between the first intake line 21 and the second intake line 22. That is, the connection line 23 branches from the first intake line 21 and joins the second intake line 22.

[0056] Each electric supercharger installed in the first intake line 21 and the second intake line 22 is used to supply supercharged air to the combustion chamber 11, and includes a motor and an electric compressor. The electric compressor is operated by the motor, compresses ambient air according to driving conditions, and supplies the compressed air to the combustion chamber 11.

[0057] The first intake valve 25 is installed in the first intake line 21. In more detail, the first intake valve 25 may be installed at the downstream side of the first electric supercharger 31 installed in the first intake pipe 21. The amount of intake air supplied through the first intake line 21 is adjusted by opening of the first intake valve 25.

[0058] The second intake valve 26 is installed in the second intake line 22. In more detail, the second intake valve 26 may be installed on the downstream side of the second electric supercharger 32 installed in the second intake pipe 22. The amount of intake air supplied through the second intake line 22 is adjusted by opening of the second intake valve 26.

[0059] The first intake line 21 and the second intake line 22 are joined at a main intake line 24, and a main intercooler 36 may be installed in the main intake line 24. The air compressed by the electric supercharger is cooled by the main intercooler 36.

[0060] The bypass valve 27 is installed on the connecting line 23. In one form, an auxiliary intercooler 35 may be installed in the connecting line 23. The air compressed by the first electric supercharger 31 is cooled by the auxiliary intercooler 35.

[0061] Air filters 29 for filtering ambient air flowing in from the outside are installed at the inlets of the first intake line 21 and the second intake line 22 .

[0062] The intake air flowing through the first intake line 21 and the second intake line 22 is supplied to the combustion chamber 11 through the intake manifold 13. The intake manifold 13 is equipped with a throttle valve 14 to adjust the amount of air supplied to the combustion chamber 11.

[0063] In an exemplary form, the two electric superchargers 31, 32 can operate in three driving modes. The three driving modes may include a single mode, a series mode, and a parallel mode.

[0064] The single mode is a mode in which only one electric supercharger operates to supply boosted air to the combustion chamber 11 of the engine 10. In the single mode, only one of the two electric superchargers (e.g., the first electric supercharger 31) is operated, and the other electric supercharger (e.g., the second electric supercharger 32) is not operated. At this time, the second intake valve 26 and the bypass valve 27 are closed, and the amount of boosted air supplied to the combustion chamber 11 can be determined by the opening of the first intake valve 25 and the rotation speed of the first electric supercharger 31. The electric supercharger can be operated in the single mode in the low load area.

[0065] The series mode is a mode in which two electric superchargers are operated to supply dual supercharged air to the combustion chamber 11 of the engine 10. At this time, the first intake valve 25 and the second intake valve 26 are both closed, and the amount of supercharged air supplied to the combustion chamber 11 is adjusted by adjusting the opening of the bypass valve 27. In addition, the controller 90 operates the first electric supercharger 31 and the second electric supercharger 32, and supplies the air supercharged by the first electric supercharger 31 and the second electric supercharger 32 to the combustion chamber 11.

[0066] That is, the ambient air flowing into the first intake line is mainly pressurized by the first electric supercharger 31, and then flows into the second intake line 22 through the connecting line 23. In addition, the air is additionally pressurized by the second electric supercharger 32.

[0067] The electric supercharger can be operated in series mode in the low-speed and high-load region. Since a high compression ratio is required in the low-speed and high-load region, the compression ratio of the ambient air supplied to the combustion chamber 11 can be increased by driving the first electric supercharger 31 and the second electric supercharger 32 in series.

[0068] The parallel mode is a mode in which each of the two electric superchargers supplies supercharged air to the combustion chamber 11 of the engine 10. At this time, the controller 90 controls the bypass valve 27 to be closed, and controls the first intake valve 25 and the second intake valve 26 to be opened, so as to control the amount of supercharged air supplied to the combustion chamber 11. In addition, the controller 90 operates the first electric supercharger 31 and the second electric supercharger 32, and supplies the air supercharged by the first electric supercharger 31 and the second electric supercharger 32 to the combustion chamber 11, respectively.

[0069] The electric supercharger can be operated in parallel mode in the high-speed and high-load region. Since a large amount of ambient air is required in the high-speed and high-load region, intake air is supplied to the combustion chamber 11 through the first intake line 21 and the second intake line 22. That is, by driving the first electric supercharger 31 and the second electric supercharger 32 in parallel, a large amount of intake air can be supplied to the combustion chamber 11.

[0070] Return to reference Figure 1 When the engine 10 is started, the HSG 40 starts the engine 10 and selectively operates as a generator to generate electrical energy.

[0071] The drive motor 50 assists the power of the engine 10 and selectively operates as a generator to generate electrical energy.

[0072] The driving motor 50 is operated by using electric energy charged in the battery 70 , and electric energy generated by the driving motor 50 and the HSG 40 is charged in the battery 70 .

[0073] In the hybrid vehicle according to the exemplary form, the power of the engine 10 and the power of the drive motor 50 are distributed in the SOC (state of charge) area of ​​the battery 70. In the exemplary form, the SOC of the battery 70 can be divided into three areas. Figure 4 , the SOC region of the battery 70 can be divided into a high region, a normal region, and a low region. In addition, the high region can be divided into a critical high (CH) and a high (H) region, the normal region can be divided into a normal high (NH) and a normal low (NL) region, and the low region can be divided into a low (L) and a critical low (CL) region.

[0074] The accelerator pedal position sensor detects the operation of the accelerator pedal. The accelerator pedal position detected by the accelerator pedal position sensor is sent to the controller 90. The controller 90 can determine the required power based on the driver's acceleration intention according to the accelerator pedal position detected by the accelerator pedal position sensor, and the driving mode can be selectively switched from the EV mode to the HEV mode.

[0075] The controller 90 controls constituent elements of the vehicle including the engine 10 , the HSG 40 , the drive motor 50 , the electric superchargers 31 and 32 , the battery 70 , and the clutch 60 .

[0076] The controller 90 may be provided as at least one processor operable by a predetermined program, wherein the predetermined program may include instructions to perform respective steps of a method of controlling an engine including an electric supercharger based on a tendency of a driver according to an exemplary form.

[0077] The clutch 60 is provided between the engine 10 and the drive motor 50, and the hybrid vehicle operates in an electric vehicle (EV) mode or a hybrid electric vehicle (HEV) mode depending on whether the clutch 60 is engaged. The EV mode is a mode in which the vehicle is driven only by the drive torque of the motor, and the HEV mode is a mode in which the vehicle is driven by the drive torque of the motor and the engine 10.

[0078] The driving force output from the engine 10 and the drive motor 50 is transmitted to the drive wheels provided in the vehicle. At this time, a transmission 80 is provided between the clutch 60 and the drive wheels. The transmission gear is installed in the transmission 80, and the torque output from the engine 10 and the drive motor 50 is switched according to the gear stage.

[0079] Hereinafter, a method of controlling an engine including an electric supercharger based on a driver's tendency according to an exemplary form will be described in detail with reference to the accompanying drawings.

[0080] Figure 5 is a flow chart illustrating a method of controlling an engine including an electric supercharger based on a driver's tendency according to an exemplary form.

[0081] Reference Figure 5 , first in step S10 , the controller 90 determines the driving tendency of the driver based on the data detected by the data detection unit.

[0082] The data detection unit detects data for determining the driving tendency of the driver and sends the data detected by the data detection unit to the controller. For this purpose, the data detection unit may include an accelerator pedal position sensor, a vehicle speed sensor, a navigation device, and a global positioning system (GPS).

[0083] The accelerator pedal position sensor measures the degree to which the driver depresses the accelerator pedal. That is, the accelerator pedal position sensor measures data related to the driver's acceleration intention.

[0084] Vehicle speed sensors measure the speed of the vehicle and are mounted on the wheels.

[0085] A navigation device is a device that notifies a driver of a path to a destination. The navigation device includes: an input-output unit that inputs and outputs information about route guidance; a current position detection unit that detects information about the current position of the vehicle; a memory that stores map data required for route calculation and data required for guidance; and a controller that is used to perform route search or route guidance. However, in an exemplary form, it is sufficient for the navigation device to provide information about the shape of the road, such as the slope of the road or the radius of curvature of the road. Therefore, it should be understood that the navigation device in this specification and claims may include any device that can provide information about the shape of the road to the controller.

[0086] GPS receives radio waves sent from GPS satellites and sends signals to navigation devices.

[0087] The controller 90 determines the driver's short-term driving tendency in a relatively short time based on the data detected by the data detection unit. That is, the controller 90 can determine the driver's driving tendency, for example, during the current drive or during a predetermined time in the current drive. The driver's short-term driving tendency can be determined based on the degree to which multiple fuzzy rules related to the driver's tendency are satisfied, and the driver's short-term driving tendency can be determined using fuzzy control theory. To this end, the controller 20 can be provided as at least one processor that can be operated by a predetermined program, wherein the predetermined program may include instructions for executing the various steps of the method for determining the driver's tendency according to an exemplary form.

[0088] The driving tendency of the driver determined by the controller 90 may be classified into gentle, normal, and sporty tendencies. The gentle driving tendency may indicate a driver of a defensive driving mode with a medium driving habit, the sporty driving tendency may indicate a driver of an aggressive driving mode with a fast acceleration habit, and the normal driving tendency may indicate a driver having a medium driving tendency between the gentle driving tendency and the sporty driving tendency.

[0089] The controller 90 may control a target speed of the electric supercharger based on the driving tendency of the driver, determine a driving mode of the electric supercharger, limit a maximum output of the engine, and variably adjust an SOC power generation region in which the battery is charged by the engine.

[0090] First, in step S20 , the controller 90 adjusts the target speed of the electric supercharger based on the driving tendency of the driver.

[0091] At this time, the controller 90 adjusts the target speed by adjusting the magnitude of the gain of the speed filter applied to the target speed of the electric supercharger in different ways according to the driving tendency of the driver.

[0092] At this time, the target speed of the electric supercharger can be determined as follows. First, the target torque of the engine is determined according to the current speed of the vehicle and the required torque of the driver. In addition, the target air volume and target boost pressure to be supplied to the combustion chamber 11 are determined from the target torque of the engine.

[0093] The amount of air passing through the electric supercharger is determined according to a target amount of air to be supplied to the combustion chamber 11, and the pressure ratio of the pressures on the upstream side and the downstream side of the electric supercharger is determined according to a target supercharging pressure.

[0094] The target speed of the electric supercharger is determined by the pressure ratio and the amount of air passing through the electric supercharger. The target speed of the electric supercharger according to the pressure ratio and the amount of air passing through the electric supercharger may be stored in the controller 90 in advance in a map data format.

[0095] Reference Figure 6 When the target speed of the electric supercharger input to the controller 90 is suddenly changed to a step input, the controller 90 adjusts the target speed by applying a speed filter to the target speed. At this time, the speed filter may be a first-order filter or a low-pass filter.

[0096] That is, the controller 90 may adjust the change in the target speed by adjusting the gain of the speed filter according to the target speed of the electric supercharger.

[0097] For example, when the driver's driving tendency is a gentle driving tendency, the target speed of the electric supercharger can be adjusted to be gentle by applying a speed filter having a maximum value gain to the target speed of the electric supercharger input as a step input (refer to Figure 6 In this way, by maximizing the gain of the speed filter to adjust the target speed smoothly, the speed of the electric supercharger can be prevented from changing suddenly, and the power consumption at the peak of the target speed can be limited.

[0098] When the driving tendency of the driver is a sporty driving tendency, by applying a speed filter having a minimum value gain to the speed filter of the target speed of the electric supercharger input as a step input, the target speed of the electric supercharger (reference Figure 6 Thus, the engine responsiveness can be maximized by minimizing the gain of the speed filter to follow the changes in the target speed as closely as possible.

[0099] When the driver's driving tendency is a normal driving tendency, the target speed of the electric supercharger that changes sharply can be adjusted to an intermediate level by applying a gain size of an intermediate value between the maximum value and the minimum value to the target speed of the electric supercharger as a step input (refer to Figure 6 In this way, by adjusting the gain size of the speed filter to an intermediate level, the reaction speed of the electric supercharger is adjusted to an intermediate level between the gentle driving tendency and the point driving tendency. Therefore, the balance between the engine responsiveness and the power consumption at the peak of the target speed can be maintained.

[0100] The controller 90 may adjust the target speed by changing the speed change rate of the target speed applied to the electric supercharger according to the driving tendency of the driver.

[0101] Reference Figure 7 , the target speed of the electric supercharger input to the controller 90 is suddenly changed to a step input, the controller 90 can limit the speed change rate of the target speed (speed change per unit time) to adjust the target speed.

[0102] For example, when the driver's driving tendency is a gentle driving tendency, the slope of the speed change rate of the target speed applied to the electric supercharger input as a step input is set to the minimum value, and the target speed that changes suddenly can be adjusted to be gentle (refer to Figure 7 In this way, by adjusting the target speed to be gentle, it is possible to prevent the speed of the electric supercharger from changing suddenly, and to limit the power consumption at the peak of the target speed.

[0103] When the driver's driving tendency is a sporty driving tendency, the slope of the speed change rate of the target speed of the electric supercharger applied as a step input is set to the maximum value, and the change of the target speed of the electric supercharger that changes sharply can be made as small as possible (refer to Figure 7 This way, engine responsiveness can be maximized by following changes in target speed as closely as possible.

[0104] When the driver's driving tendency is a normal driving tendency, the slope of the speed change rate of the target speed applied to the electric supercharger input as a step input is set to an intermediate value between the maximum value and the minimum value, and the abruptly changed target speed of the electric supercharger can be adjusted to an intermediate level (reference Figure 7 In this way, by adjusting the reaction speed of the electric supercharger to an intermediate level between the gentle driving tendency and the sporty driving tendency, it is possible to maintain a balance between the engine responsiveness and the power consumption at the peak of the target speed.

[0105] Then in step S30 , the controller 90 determines a driving mode of the electric supercharger based on the driving tendency of the driver.

[0106] When the driver's driving tendency is gentle, since the maximum torque of the engine is limited, a single electric supercharger may be sufficient for boosting. In this case, the controller 90 may control the electric supercharger to operate in a single mode.

[0107] When the driver's driving tendency is normal or sporty, and a high boost pressure is required in a low-medium-speed high-load region, the controller 90 may control the electric supercharger in the series mode.

[0108] In addition, when the driver's driving tendency is normal or sporty, and a large amount of air needs to be supplied to the combustion chamber 11 as in a high-speed high-load area, the controller 90 may control the electric supercharger in the parallel mode.

[0109] In step S40 , the controller 90 limits (or adjusts) the maximum output of the engine based on the driving tendency of the driver.

[0110] Reference Figure 8 When the driver's driving tendency is a sporty driving tendency, the controller 90 sets the engine to output the maximum torque in all speed ranges (reference Figure 8 ), thereby maximizing the engine's output and driving performance.

[0111] When the driver's driving tendency is normal, the controller 90 sets the engine to output an intermediate torque (refer to Figure 8 ), thereby controlling the engine to maintain appropriate output performance.

[0112] When the driver's driving tendency is a gentle driving tendency, the controller 90 sets the engine to output a minimum torque (reference torque) less than the intermediate torque in all speed regions. Figure 8 ), thereby actively limiting the engine's output and preventing the engine from entering an inefficient driving point.

[0113] In step S50 , the controller 90 variably adjusts the SOC power generation region in which the battery is charged by the engine based on the driving tendency of the driver.

[0114] The SOC power generation area may refer to an area from the SOC start value (starting to charge the battery by the engine) to the SOC end value (completing the engine charging the battery) to maintain the SOC at an appropriate level. The SOC start value may be set in the SOC low area, and the SOC end value may be set in the SOC normal area.

[0115] Reference Fig. 9 When the driver's driving tendency is a gentle driving tendency, the controller 90 sets the SOC start value to the SOC minimum value in the SOC low area, thereby minimizing the engine's charging of the battery. In addition, by setting the SOC end value to the SOC minimum value in the SOC normal area, the engine can be prevented from overcharging.

[0116] When the driver's driving tendency is a sporty driving tendency, the controller 90 sets the SOC start value to the SOC maximum value in the SOC low area and sets the SOC end value to the SOC maximum value in the SOC normal area, thereby ensuring the power for driving the electric supercharger and minimizing the charging of the battery by utilizing the engine output when high-load driving is required.

[0117] When the driver's driving tendency is a normal driving tendency, the controller 90 sets the SOC start value to an SOC middle value between the SOC minimum value in the SOC low area and the SOC maximum value in the SOC normal area, and sets the SOC end value to an SOC middle value between the SOC minimum value in the SOC normal area and the SOC maximum value in the SOC normal area, thereby maintaining the battery's state of charge at an appropriate level.

[0118] That is, as the driver's driving tendency tends toward gentle, normal, and sporty, the SOC start value and the SOC end value gradually increase.

[0119] Although the present disclosure has been described in connection with what are presently considered to be practical exemplary forms, it should be understood that the present disclosure is not limited to the forms disclosed. On the contrary, the present disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the present disclosure.

[0120] <Description of symbols>

[0121] 10: Engine

[0122] 11: Combustion Chamber

[0123] 13: Intake manifold

[0124] 14: Throttle valve

[0125] 15: Exhaust manifold

[0126] 17: Exhaust line

[0127] 19: Catalytic converter

[0128] 21: First air intake line

[0129] 22: Second air intake line

[0130] 23: Connecting pipelines

[0131] 24: Main air intake line

[0132] 25: First intake valve

[0133] 26: Second intake valve

[0134] 27: Bypass valve

[0135] 29: Air filter

[0136] 31: The first electric supercharger

[0137] 32: Second electric supercharger

[0138] 35: Auxiliary intercooler

[0139] 36: Main intercooler

[0140] 40: HSG

[0141] 50: Drive motor

[0142] 60: Clutch

[0143] 70: Battery

[0144] 80: Transmission

[0145] 90: Controller

[0146] 100: Data detection unit.

Claims

1. A device for controlling an engine including an electric supercharger, the device comprising: an engine, configured to combust fuel to produce power; a drive motor configured to assist said power of said engine and selectively function as a generator to produce electrical energy; a battery configured to supply the electric energy to the drive motor and to be charged by the electric energy generated from the drive motor; a plurality of electric superchargers respectively installed in a plurality of intake lines through which ambient air flows to be supplied to the combustion chambers of the engine; as well as a controller configured to adjust a target speed of an electric supercharger among the plurality of electric superchargers, determine a driving mode of the plurality of electric superchargers, limit a maximum output of the engine, and variably adjust a state-of-charge power generation region in which the engine charges the battery based on a driving tendency of a driver; The driving tendency of the driver is divided into a sport tendency, a normal tendency and a gentle tendency; The state-of-charge power generation region corresponds to a region covering a state-of-charge start value at which the engine starts charging the battery to a state-of-charge end value at which the engine ends charging the battery; The battery state of charge region is divided into three different regions: a high state of charge region, a normal state of charge region, and a low state of charge region; wherein, when the driving tendency is the gentle tendency, the controller is configured to set the state of charge start value to the state of charge minimum value within the state of charge low region, and to set the state of charge end value to the state of charge minimum value within the state of charge normal region; When the driving tendency is the sport tendency, the controller is configured to set the state of charge start value to a state of charge maximum value within the state of charge low region, and to set the state of charge end value to a state of charge maximum value within the state of charge normal region; and When the driving tendency is the normal tendency, the controller is configured to set the state of charge start value to a state of charge intermediate value between the state of charge minimum value in the low state of charge area and the state of charge maximum value in the normal state of charge area, and to set the state of charge end value to a state of charge intermediate value between the state of charge minimum value in the normal state of charge area and the state of charge maximum value in the normal state of charge area.

2. The device according to claim 1, wherein: The controller is configured to adjust the target speed by differently adjusting a magnitude of a gain of a speed filter applied to the target speed of the electric superchargers among the plurality of electric superchargers based on the driving tendency of the driver.

3. The apparatus according to claim 2, wherein: When the driving tendency is the sport tendency, the controller is configured to apply a maximum value to the magnitude of the gain; When the driving tendency is the gentle tendency, the controller is configured to apply a minimum value to the magnitude of the gain; and When the driving tendency is the normal tendency, the controller is configured to determine the magnitude of the gain to be a value between the maximum value and the minimum value.

4. The device according to claim 1, wherein: The controller is configured to adjust the target speed by changing a speed change rate of the target speed of the electric superchargers applied to the plurality of electric superchargers based on the driving tendency of the driver.

5. The apparatus according to claim 4, wherein: When the driving tendency is the sport tendency, the controller is configured to set the slope of the speed change rate applied to the target speed to a maximum value; When the driving tendency is the gentle tendency, the controller is configured to set the slope of the speed change rate applied to the target speed to a minimum value; and When the driving tendency is the normal tendency, the controller is configured to set the slope of the speed change rate applied to the target speed to a value between the maximum value and the minimum value.

6. The apparatus of claim 1, wherein: When the driving tendency is the sport tendency, the controller is configured to set the engine to output maximum torque; When the driving tendency is the normal tendency, the controller is configured to set the engine to output an intermediate torque that is less than the maximum torque; and When the driving tendency is the gentle tendency, the controller is configured to set the engine to output a minimum torque that is smaller than the intermediate torque.

7. A method of controlling an engine including an electric supercharger, the method comprising the steps of: The controller determines the driving tendency of the driver; adjusting, by the controller, target speeds of a plurality of electric superchargers based on the determined driving tendency; determining, by the controller, a driving mode of the plurality of electric superchargers based on the determined driving tendency; and variably adjusting, by the controller, a state-of-charge power generation region in which the engine charges a battery based on the determined driving tendency; The driving tendency of the driver is divided into a sport tendency, a normal tendency and a gentle tendency; The state-of-charge power generation region corresponds to a region covering a state-of-charge start value at which the engine starts charging the battery to a state-of-charge end value at which the engine ends charging the battery; The battery state of charge region is divided into three different regions: a high state of charge region, a normal state of charge region, and a low state of charge region; wherein, when the driving tendency is the gentle tendency, the controller is configured to set the state of charge start value to the state of charge minimum value in a low state of charge region, and to set the state of charge end value to the state of charge minimum value in a normal state of charge region; When the driving tendency is the sport tendency, the controller is configured to set the state of charge start value to a state of charge maximum value within the state of charge low region, and to set the state of charge end value to a state of charge maximum value within the state of charge normal region; and When the driving tendency is the normal tendency, the controller is configured to set the state of charge start value to a state of charge intermediate value between the state of charge minimum value in the low state of charge area and the state of charge maximum value in the normal state of charge area, and to set the state of charge end value to a state of charge intermediate value between the state of charge minimum value in the normal state of charge area and the state of charge maximum value in the normal state of charge area.

8. The method according to claim 7, wherein: In adjusting the target speed, the target speed is adjusted by adjusting the magnitudes of gains of speed filters applied to the target speeds of the plurality of electric superchargers in different ways based on the determined driving tendency.

9. The method according to claim 8, wherein: When the determined driving tendency is the sport tendency, applying a maximum value to the magnitude of the gain; When the determined driving tendency is the gentle tendency, applying a minimum value to the magnitude of the gain; and When the determined driving tendency is the normal tendency, the magnitude of the gain is determined to be a value between the maximum value and the minimum value.

10. The method according to claim 7, wherein: In adjusting the target speed, the target speed is adjusted by changing a magnitude of a speed change rate of the target speed applied to the plurality of electric superchargers based on the determined driving tendency.

11. The method according to claim 10, wherein: when the determined driving tendency is the sport tendency, setting a slope of the speed change rate applied to the target speed to a maximum value; When the determined driving tendency is the gentle tendency, setting the slope of the speed change rate applied to the target speed to a minimum value; and When the determined driving tendency is the normal tendency, the slope of the speed change rate applied to the target speed is set to a value between the maximum value and the minimum value.

12. The method according to claim 7, wherein: When the determined driving tendency is the sport tendency, the engine is set to output maximum torque; When the determined driving tendency is the normal tendency, the engine is set to output an intermediate torque that is less than the maximum torque; and When the determined driving tendency is the gentle tendency, the engine is set to output a minimum torque that is smaller than the intermediate torque.

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