Hybrid vehicle and method of controlling hybrid vehicle

Abstract

The invention relates to a hybrid vehicle and a method of controlling the same. A hybrid vehicle includes an engine configured to generate power for driving the vehicle by combustion of fuel. The hybrid vehicle also includes a drive motor configured to generate another power for driving the vehicle and selectively generate electrical energy by operating as a generator. The hybrid vehicle also includes a battery configured to supply electric energy to the drive motor or to be charged by electric energy generated by the drive motor. The hybrid vehicle also includes a controller configured to control operation of the engine by using different torque maps based on a driver's requested torque, a state of charge (SOC) of the battery, a driving mode of the vehicle, an operating state of a fully automatic temperature controller (FATC), and a coolant temperature.

Description

Technical Field

[0001] The present invention relates to a hybrid vehicle and a method of controlling the hybrid vehicle, and more particularly, to a hybrid vehicle capable of enhancing heating performance in low-load driving of a vehicle and a method of controlling the hybrid vehicle. Background Art

[0002] A hybrid vehicle is a vehicle that utilizes two or more power sources, and generally refers to a hybrid electric vehicle that utilizes an engine and a motor for driving. A hybrid electric vehicle may take various forms utilizing two or more power sources including an engine and a motor.

[0003] Generally, a hybrid electric vehicle uses a powertrain in a transmission mounted electric drive (TMED) manner in which a drive motor, a transmission, and a drive shaft are connected to each other in series.

[0004] In addition, the clutch is arranged between the engine and the motor, and the hybrid electric vehicle is driven in an electric vehicle (EV) mode, a hybrid electric vehicle (HEV) mode, or an engine-only mode depending on whether the clutch is engaged. The EV mode is a mode in which the vehicle is driven only by the driving torque of the driving motor, the HEV mode is a mode in which the vehicle is driven by the driving torque of the driving motor and the engine, and the engine mode is a mode in which the vehicle is driven only by the driving torque of the engine.

[0005] In the case of a hybrid vehicle, in a low-temperature driving situation where the state of charge (SOC) of the battery is high, the outside air temperature is low, and the coolant temperature is low, the engine is enabled to heat the vehicle interior. At this time, since the SOC is high, the engine torque corresponding to the driver's request torque is output, and the battery's SOC gradually decreases due to the power consumption of the vehicle's electrical components. However, there may be a situation where it becomes challenging to provide enough heat to heat the vehicle interior because the driver's request torque is low and the drive load is low. Although the vehicle interior can be heated by an electric heater, there is a problem of rapid discharge of the battery due to the very low efficiency of the electric heater.

[0006] In other words, in the range where the battery SOC is high, the engine is enabled or disabled based on the SOC operation strategy. Therefore, when the vehicle is running under low temperature and low load conditions, it may be difficult to ensure a heating source (e.g., sufficient heat) for heating the vehicle interior because sufficient engine torque cannot be output.

[0007] The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention 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

[0008] The present invention provides a hybrid vehicle and a method of controlling the hybrid vehicle, which can ensure a heating source for heating the interior of the vehicle when the hybrid vehicle is driven at low temperature and low load conditions in a high state of charge (SOC) range of a battery.

[0009] The hybrid vehicle includes: an engine configured to generate power for driving the vehicle by combustion of fuel. The hybrid vehicle also includes: a drive motor configured to generate another power for driving the vehicle and selectively generate electrical energy by operating as a generator. The hybrid vehicle also includes: a battery configured to supply electrical energy to the drive motor or to be charged by the electrical energy generated by the drive motor. The hybrid vehicle also includes: a controller configured to control the operation of the engine by utilizing different torque mappings based on the driver's requested torque, the battery's state of charge (SOC), the vehicle's driving mode, the operating state of a fully automatic temperature controller (FATC), and the coolant temperature.

[0010] When the SOC of the battery is in the standard high range, the driving mode may be a mode other than the sport mode, and the fully automatic temperature controller may be in an off state, the controller may be configured to control the engine through a first torque mapping to meet the driver's request torque.

[0011] When the SOC of the battery is in the standard high range and the driving mode is the sport mode, the controller may be configured to control the engine through a second torque mapping to meet the driver's request torque.

[0012] When the battery's SOC is in the standard high range, the driving mode is a mode other than the sport mode, the fully automatic temperature controller is on, and the low temperature and low load driving conditions are met, the engine can be controlled by the larger value in the second torque mapping and the third torque mapping to meet the driver's requested torque.

[0013] When the driver's request torque is lower than a predetermined torque and the coolant temperature is lower than a predetermined temperature, low temperature and low load driving conditions may be met.

[0014] In another embodiment of the present invention, a method of controlling a hybrid vehicle includes determining a state of charge (SOC) of a battery, determining a driving mode of the vehicle, and determining an operating state of a fully automatic temperature controller (FATC).

[0015] The method further includes controlling operation of the engine by utilizing different torque maps based on a driver's requested torque, a battery state of charge (SOC), a vehicle drive mode, a fully automatic temperature controller operating state (FATC), and a coolant temperature.

[0016] When the SOC of the battery is in the standard high range, the driving mode is a mode other than the sport mode, and the fully automatic temperature controller is in an off state, the engine may be controlled by the first torque mapping.

[0017] When the battery's SOC is in the standard high range and the driving mode is the sport mode, the engine can be controlled by the second torque mapping.

[0018] When the battery's SOC is in the standard high range, the driving mode is a mode other than the sports mode, the fully automatic temperature controller is on, and the low temperature and low load driving conditions are met, the engine can be controlled by the larger value of the second torque mapping and the third torque mapping.

[0019] When the driver's request torque is lower than a predetermined torque and the coolant temperature is lower than a predetermined temperature, low temperature and low load driving conditions may be met.

[0020] According to the hybrid vehicle according to the present invention, when the SOC of the battery is in the standard high range, the engine torque is controlled by a separate torque mapping according to the vehicle's driving mode and the on / off of the fully automatic temperature controller. When the vehicle is traveling under low temperature and low load driving conditions, the engine torque can be more accurately controlled and the heating performance of the vehicle can be enhanced.

[0021] Other effects that can be obtained or predicted by the embodiment are described explicitly or implicitly in the detailed description of the present invention. In other words, various effects predicted according to the embodiment are described in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] These drawings are only used for reference when describing the embodiments of the present invention, and thus the technical idea of ​​the present invention is not limited by the attached drawings.

[0023] Figure 1 is a schematic diagram showing the configuration of a hybrid vehicle according to one embodiment of the present invention.

[0024] Figure 2 is a block diagram showing the configuration of a hybrid vehicle according to one embodiment of the present invention.

[0025] Figure 3 is a schematic diagram showing a state of charge (SOC) interval of a hybrid vehicle according to an embodiment of the present invention.

[0026] Figure 4 is a flowchart illustrating a method of controlling a hybrid vehicle according to one embodiment of the present invention.

[0027] It should be understood that the above drawings are not necessarily drawn to scale, but are appropriately simplified drawings of various features presented to illustrate the basic principles of the present invention. The specific design features of the present invention (including, for example, specific size, direction, position and shape) should be determined in part by the specific environment to be applied and used.

[0028] Description of Reference Numerals

[0029] 10: Engine

[0030] 11: Combustion Chamber

[0031] 30: Fully automatic temperature controller

[0032] 40: HSG

[0033] 50: Drive motor

[0034] 60: Clutch

[0035] 70: Battery

[0036] 80: Transmission

[0037] 90: Controller

[0038] 100:APS

[0039] 110: BMS

[0040] 120: Mode selection button

[0041] 130: Temperature sensor. DETAILED DESCRIPTION

[0042] The terms used in this article are only used for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. As used herein, the terms "include" and / or "include" refer to the presence of specified features, numerical values, steps, operations, elements and / or components, but should also be understood as not excluding the presence or addition of one or more other features, numerical values, steps, operations, components and / or their groups. As used herein, the term "and / or" includes any or all combinations of one or more related enumeration items.

[0043] In addition, it should be understood that one or more of the following methods or aspects can be performed by at least one controller. The term "controller" can refer to a hardware device including a memory and a processor. The memory is configured to store program instructions, and the processor is specifically programmed to execute the program instructions to perform one or more processes further described below. The controller can control the operation of the unit, module, component, device, etc., as described herein. In addition, it should be understood that the following method can be performed by a device including a controller in combination with one or more other components, as understood by a person of ordinary skill in the art.

[0044] In addition, the controller of the present invention can be implemented as a non-volatile computer-readable medium containing executable program instructions that can be executed by a processor. Examples of computer-readable media include, but are not limited to, ROM, RAM, compact disk (CD)-ROM, magnetic tape, floppy disk, flash drive, smart card, and optical data storage device. The computer-readable recording medium can also be distributed over a computer network so that the program instructions are stored and executed in a distributed manner, for example, by a telematics server or a controller area network (CAN).

[0045] The present invention is described more fully hereinafter with reference to the accompanying drawings, in which the present invention is illustrated. As those skilled in the art would realize, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present invention.

[0046] The drawings and description are to be regarded as illustrative rather than restrictive, and like reference numerals refer to like elements throughout the specification.

[0047] In addition, the size and thickness of each configuration shown in the drawings are arbitrarily shown for ease of understanding and description, but the present invention is not limited thereto. In order to clearly illustrate several parts and intervals, the thickness is increased.

[0048] The terms "module" and "unit" for components used in the following description are used only to facilitate the description. Therefore, these terms themselves do not have meanings or roles distinguished from each other.

[0049] In describing the embodiments of the present specification, when it is determined that a detailed description of known art related to the present invention may obscure the gist of the present invention, it will be omitted.

[0050] The accompanying drawings are provided only to make the embodiments disclosed in this specification easy to understand and should not be interpreted as limiting the spirit of the present invention. It should be understood that the present invention includes all modifications, equivalents and alternatives without departing from the scope and spirit of the present invention.

[0051] Terms including ordinal numbers (e.g., first, second, etc.) are used only to describe various components and should not be interpreted as limiting these components. When a component, device, element, etc. of the present invention is described as having a purpose or performing an operation, function, etc., the component, device, or element should be considered herein as "configured to" meet the purpose or perform the operation or function.

[0052] As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0053] These terms are only used to distinguish one component from other components.

[0054] It will be understood that when a component is referred to as being “connected” or “coupled” to another component, it may be directly connected or coupled to the other component or connected or coupled to the other component with other components interposed therebetween.

[0055] Unless otherwise specifically indicated, the order of operations or steps is not limited to the order shown in the claims or drawings. The order of operations or steps may be changed, several operations or steps may be combined, a certain operation or step may be divided, and a specific operation or step may not be performed.

[0056] Hereinafter, a hybrid vehicle according to the present invention is described in detail with reference to the accompanying drawings.

[0057] Figure 1 is a schematic diagram showing the configuration of a hybrid vehicle according to the present invention. In addition, Figure 2 is a block diagram showing the configuration of a hybrid vehicle according to the present invention.

[0058] The hybrid vehicle according to the embodiment of the present invention is described below based on the structure of a transmission mounted electric drive (TMED) scheme as an example. However, the scope of the present invention is not limited thereto, and the present invention can be applied to hybrid electric vehicles in other schemes as a matter of course.

[0059] According to an embodiment of the present invention, Figure 1 and Figure 2 As shown, the hybrid vehicle may include an engine 10 , a hybrid starter and generator (HSG) 40 , a drive motor 50 , a clutch 60 , a battery 70 , an accelerator pedal sensor, and a controller 90 .

[0060] The engine 10 generates power required to drive the vehicle by burning fossil fuel.

[0061] The HSG 40 may start the engine 10 and may generate electrical energy by selectively operating as a generator after the engine 10 is started.

[0062] The drive motor 50 assists the power of the engine 10 and selectively operates as a generator to generate electrical energy.

[0063] The HSG 40 and the drive motor 50 operate by using electric energy in the battery 70 , and the battery 70 is charged with electric energy generated by the drive motor 50 and the HSG 40 .

[0064] The state of charge (SOC) indicating the state of charge of the battery 70 can be divided into three intervals. Figure 3 , the SOC of the battery 70 can be divided into a high SOC interval, a standard SOC interval and a low SOC interval according to the power level of the battery 70.

[0065] In addition, according to the power level of the battery 70, the high interval can be divided into a very high interval and a standard high interval, the standard interval can be divided into a standard discharge interval and a standard charge interval, and the low interval can be divided into a standard low interval and a very low interval.

[0066] The SOC of the battery 70 is managed by a battery management system (BMS), and information on the SOC of the battery 70 is transmitted to the controller 90 .

[0067] An accelerator pedal sensor (APS) is configured to detect the amount of operation of the accelerator pedal by the driver. The amount of operation of the accelerator pedal detected by the accelerator pedal sensor is sent to the controller 90. The controller 90 can determine the driver's request torque corresponding to the driver's acceleration intention, which is determined based on the amount of operation of the accelerator pedal detected by the accelerator pedal sensor.

[0068] The clutch 60 is provided between the engine 10 and the drive motor 50, and the hybrid vehicle operates in an engine mode, an electric vehicle (EV) mode, or a hybrid electric vehicle (HEV) mode according to the engagement of the clutch 60. The EV mode is a mode in which the vehicle is driven only by the drive torque of the drive motor, the HEV mode is a mode in which the vehicle is driven by the drive torque of the drive motor and the engine 10, and the engine mode is a mode in which the vehicle is driven only by the drive torque of the engine 10.

[0069] The driving force output from the engine 10 and the driving motor 50 is transmitted to the driving wheels provided in the vehicle. At this time, a transmission (TM) 80 is provided between the clutch 60 and the driving wheels. A shifting gear is installed in the transmission 80 so that the torque output from the engine 10 and the driving motor 50 changes according to the shifting gear stage.

[0070] A full automatic temperature controller (FATC) is configured to control the temperature inside a vehicle by adjusting an air conditioning device provided in the vehicle. When an occupant of the vehicle turns on the full automatic temperature controller, the full automatic temperature controller controls the air conditioning device to follow the temperature set by the occupant.

[0071] The air conditioning apparatus may be configured such that when the heat exchange medium output through the operation of the compressor circulates to the condenser, the receiver dryer, the expansion valve, the evaporator, and then returns to the compressor, the interior of the vehicle may be cooled by heat exchange through the evaporator, or the interior of the vehicle may be heated by allowing the coolant that cools the engine 10 or the drive motor 50 to flow into the heater and perform heat exchange.

[0072] A hybrid vehicle is provided with various electrical components that consume the electric energy of the battery, such as a drive motor, an inverter, an electric heater, an air conditioner, and the like.

[0073] The controller 90 is configured to control components of the vehicle including the engine 10 , the HSG 40 , the drive motor 50 , the battery 70 , and the clutch 60 .

[0074] To this end, the controller 90 may be implemented as at least one processor operated by a predetermined program, and program instructions programmed to execute each step of the method of controlling a vehicle provided with a motor through the at least one processor are stored in a memory of the controller.

[0075] Meanwhile, the hybrid vehicle may include a plurality of driving modes, which may include an economy mode (ie, a fuel efficiency mode), a standard mode, a snow mode, a comfort mode, and a sport mode.

[0076] The economy mode is a driving mode for achieving higher fuel efficiency (or electrical efficiency), and refers to a driving mode in which the engine speed is lower than that of the general driving mode when shifting gears. The sports mode is a mode for improving the acceleration performance of the vehicle, and refers to a driving mode in which the vehicle uses a higher driving speed. The snow mode refers to a driving mode that prevents the vehicle from slipping on slippery roads such as snowy roads. The comfort mode refers to a driving mode that makes the vehicle occupants feel comfortable and reduces noise to maximize driving comfort. In addition, the standard mode refers to a vehicle driving mode other than special modes such as the economy mode, the sports mode, the snow mode, and the comfort mode.

[0077] The driver (or passenger) may select a driving mode of the vehicle by operating a mode selection button 120 provided in the vehicle.

[0078] According to one embodiment of the present invention, the hybrid vehicle includes a temperature sensor 130 configured to detect the temperature of the coolant for cooling the engine 10 or the drive motor 50 , and transmit the coolant temperature detected by the temperature sensor 130 to the controller 90 .

[0079] Hereinafter, a method of controlling a hybrid vehicle according to an embodiment of the present invention is described in detail with reference to the accompanying drawings.

[0080] Figure 4 is a flowchart illustrating a method of controlling a hybrid vehicle according to one embodiment of the present invention.

[0081] refer to Figure 4 , in step S10 , the controller 90 determines the SOC of the battery 70 transmitted from the battery management system.

[0082] In step S10 , when the SOC of the battery 70 is in the high range (“YES” in step S10 ), the controller 90 determines whether the driving mode of the hybrid vehicle is the sport mode in step S20 .

[0083] In step S20 , when the driving mode of the hybrid vehicle is a driving mode other than the sport mode (eg, the energy saving mode or the standard mode) (“NO” in step S20 ), the controller 90 determines whether the full-automatic temperature controller is in the on state in step S30 .

[0084] When the driving mode of the hybrid vehicle is a driving mode other than the sport mode (e.g., the energy-saving mode or the standard mode) and the fully automatic temperature controller is in the off state ("No" in step S30), in step S31, the controller 90 outputs the driver's request torque by outputting the engine torque using the first torque map. At this time, the engine torque output through the first torque map may be determined based on the driver's request torque and the engine speed (e.g., rpm). The engine torque output through the first torque map may be an engine torque output in a range below the optimal operating line (OOL) of the engine.

[0085] In step S20, when the driving mode of the hybrid vehicle is the sport mode ("Yes" in step S20), in step S21, the controller 90 outputs the driver's request torque by outputting the engine torque using the second torque map. At this time, the engine torque output through the second torque map can be determined based on the driver's request torque, the engine speed and the SOC.

[0086] In step S30 , when the full-automatic temperature controller is in the on state (“YES” in step S30 ), in step S40 , the controller 90 determines whether the driving conditions of low temperature and low load are satisfied.

[0087] When the driver's requested torque is lower than a predetermined torque (e.g., 100 Nm), the coolant temperature is lower than a predetermined temperature (e.g., 40 degrees Celsius), and the SOC of the battery 70 is in a standard high range in a high range, low temperature and low load driving conditions can be met.

[0088] The low temperature driving condition can be determined based on the coolant temperature, and the low load driving condition can be determined based on the driver's requested torque. When the SOC of the battery is in a very high range, priority is given to the rapid discharge of the battery 70. Therefore, when the SOC is in a very high range, the hybrid vehicle can be driven mainly in EV mode. EV mode is a mode in which the driving force output by the engine is not involved in the driving of the vehicle. In EV mode, the engine can be turned off so that the vehicle travels only by the driving force of the drive motor 50, or the engine can be driven (for example, idling), but the clutch 60 is not engaged, so that the vehicle travels only by the driving force of the drive motor 50.

[0089] In step S40, when the conditions of low temperature and low load are met ("Yes" in step S40), in step S50, the engine torque T2 determined by the second torque map is compared with the engine torque T3 determined by the third torque map, and the larger value of the engine torque T2 determined by the second torque map and the engine torque T3 determined by the third torque map is determined as the engine torque. In other words, in step S51, the controller 90 controls the engine using the larger value of the engine torque T2 determined by the second torque map and the engine torque T3 determined by the third torque map. The engine torque output by the third torque map can be determined based on the driver's request torque, the power consumption of the electrical component load, the coolant temperature, and the SOC.

[0090] In terms of managing SOC in low load intervals, the concepts of the second torque map and the third torque map are basically similar. Specifically, the second torque map used when the driving mode of the vehicle is the sport mode enables the engine for a longer period of time because the performance of the vehicle is more important, and in order to heat the interior of the vehicle, the third torque map that takes into account the electrical load also enables the engine for a longer period of time. Therefore, in a low load (or low torque) interval where the driver's requested torque is small, the engine can be controlled by utilizing the larger value of the engine torque of the third torque map (which takes into account the heating of the interior of the vehicle) and the engine torque of the second torque map (which takes into account the dynamic performance of the vehicle). In other words, by comparing the engine torque of the second torque map and the engine torque of the third torque map having similar characteristics, and then controlling the engine by utilizing the larger value, the diversity for determining the engine torque can be increased, and the heating performance of the vehicle can be enhanced.

[0091] The driver's requested torque (or, requested load) is in the middle load (or, middle torque) and high load (or, high torque) ranges, and the engine torques determined by the first torque mapping, the second torque mapping, and the third torque mapping are similar.

[0092] However, when the driver's requested torque (or, requested load) is in a low load (or, low torque) interval, the engine torque determined by the first torque mapping is substantially similar to the engine torque determined by the third torque mapping, or tends to be slightly larger. In addition, the engine torque determined by the third torque mapping tends to be greater than the engine torque determined by the second torque mapping, but is not necessarily limited thereto.

[0093] In addition, the engine torque determined by each torque map (first torque map to third torque map) cannot exceed the sum of the driver's request torque and the torque required by the electrical components. At this time, when the vehicle interior temperature reaches the temperature set by the driver (or passenger) through the air conditioning device, the engine torque determined by the second torque map and the engine torque determined by the third torque map become substantially the same.

[0094] According to the hybrid vehicle and the method for controlling the hybrid vehicle according to the present invention, when the SOC of the battery is in the standard high range, when the driving conditions of low temperature and low load are met, the engine torque is determined in consideration of the coolant temperature, the power consumption of the electrical components, or the SOC, so that the heating performance of the vehicle can be enhanced. In other words, when the vehicle is running under low temperature and low load conditions, the engine torque is determined by using a new engine torque map (e.g., the third torque map of the present invention) that takes into account the driver's request torque, the coolant temperature, the power consumption of the electrical components, and the SOC, so that the coolant temperature can be quickly increased, so that the heating performance of the vehicle can be enhanced.

[0095] In addition, when the battery's SOC is in the standard high range, the engine torque is controlled by controlling the engine torque according to the vehicle's driving mode and the on / off of the fully automatic temperature controller, which allows the engine torque to be controlled more accurately when the vehicle is running under low temperature and low load conditions.

[0096] While the invention has been described in conjunction with what are presently considered to be practical embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but rather is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A hybrid vehicle comprising: an engine configured to generate power for driving a vehicle through combustion of a fuel; a drive motor configured to generate another power for driving the vehicle and selectively generate electric energy by operating as a generator; a battery configured to supply electric energy to the drive motor or to be charged by electric energy generated by the drive motor; as well as A controller is configured to control operation of the engine by utilizing different torque maps based on a driver's requested torque, a battery state of charge, a vehicle drive mode, an operating state of a fully automatic temperature controller, and a coolant temperature.

2. The hybrid vehicle according to claim 1, wherein: When the state of charge of the battery is in the standard high range, the driving mode is a mode other than the sport mode, and the fully automatic temperature controller is in an off state, the controller is configured to control the engine through a first torque map to meet the driver's request torque.

3. The hybrid vehicle according to claim 2, wherein: When the state of charge of the battery is in the standard high range and the driving mode is the sport mode, the controller is configured to control the engine through the second torque mapping to meet the driver's request torque.

4. The hybrid vehicle according to claim 3, wherein: When the battery's state of charge is in the standard high range, the driving mode is a mode other than the sport mode, the fully automatic temperature controller is on, and low temperature and low load driving conditions are met, the engine is controlled by the larger value of the second torque map and the third torque map to meet the driver's requested torque.

5. The hybrid vehicle according to claim 4, wherein: When the driver's request torque is lower than a predetermined torque and the coolant temperature is lower than a predetermined temperature, the low temperature and low load driving condition is satisfied.

6. A method for controlling a hybrid vehicle, the method comprising: Determine the battery's state of charge; determining a driving mode of the vehicle; Determine the operating status of the fully automatic temperature controller; The engine operation is controlled by utilizing different torque maps based on the driver's requested torque, the battery's state of charge, the vehicle's drive mode, the operating state of the fully automatic temperature controller, and the coolant temperature.

7. The method according to claim 6, wherein: When the state of charge of the battery is in the standard high range, the driving mode is a mode other than the sport mode, and the fully automatic temperature controller is in an off state, the engine is controlled by the first torque mapping.

8. The method according to claim 7, wherein: When the battery's state of charge is in the standard high range and the drive mode is the sport mode, the engine is controlled by the second torque mapping.

9. The method according to claim 8, wherein: When the battery's state of charge is in the standard high range, the driving mode is a mode other than the sport mode, the fully automatic temperature controller is on, and low temperature and low load driving conditions are met, the engine is controlled by the larger value of the second torque map and the third torque map.

10. The method according to claim 9, wherein: When the driver's request torque is lower than a predetermined torque and the coolant temperature is lower than a predetermined temperature, the low temperature and low load driving condition is satisfied.

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