KR20200129208A - Vehicle and method of controlling the same - Google Patents

Abstract

The present invention relates to a vehicle and a control method thereof. The object of the present invention is to improve fuel economy by operating a vehicle drive system in an optimal driving range when in transition between the HEV mode and EV mode of the vehicle. To this end, the control method of a vehicle according to the present invention includes the steps of: determining a driving tendency of a driver based on an average vehicle speed of the vehicle, a charge state of a battery, and an accelerator pedal operation amount; and determining a driving mode of the vehicle based on the driving tendency of the driver.

Description

Vehicle and its control method {VEHICLE AND METHOD OF CONTROLLING THE SAME}

The present invention relates to a vehicle, and to a hybrid vehicle including both a motor and an engine.

Efforts to recognize the driving situation of a vehicle and use it for control are continuously being performed, and accurate driving pattern classification is a very important factor in fuel efficiency optimization techniques.

Driving patterns have evolved in various ways, from the basic technique of classifying the vehicle speed based on the method of classifying the environment (outdoor temperature) and the driver's driving habits (driving load).

According to an aspect of the present invention, an object of the present invention is to improve fuel economy by operating a vehicle drive system in an optimal driving range when the HEV mode and the EV mode of a hybrid vehicle transition.

A vehicle control method according to the present invention for the above object comprises the steps of determining whether a driver's driving tendency is a moderate driving tendency based on an average vehicle speed of the vehicle, a battery state of charge, and an accelerator pedal operation amount; And controlling the driving of the vehicle in a preset high-speed driving mode to consider the moderate driving tendency when the driving tendency of the driver is the moderate driving tendency.

In the vehicle control method described above, the average vehicle speed of the vehicle is divided into a plurality of preset sections, and it is determined which section of the plurality of sections belongs to the average speed of the vehicle during a preset time period.

In the vehicle control method described above, it is predicted through the average vehicle speed whether the vehicle will enter either an EV mode running only with a motor or an HEV mode running using both an engine and the motor.

In the vehicle control method described above, the battery charging state is divided into a plurality of sections corresponding to each of a plurality of sections of the average vehicle speed, and it is determined which section of the plurality of sections belongs to the battery charging state.

In the vehicle control method described above, it is predicted whether the vehicle will enter into one of an EV mode running only with a motor and an HEV mode running using both an engine and the motor through the battery charging state.

In the vehicle control method described above, when the accelerator pedal operation amount is less than or equal to a preset operation amount, it is determined that the driving tendency of the driver is a moderate tendency.

In the vehicle control method described above, it is predicted whether the vehicle will enter into one of an EV mode running only with a motor and an HEV mode running using both an engine and the motor based on the accelerator pedal operation amount.

In the vehicle control method described above, controlling the vehicle includes controlling the number of transmission stages of the vehicle and the number of revolutions (rpm) of the engine.

A vehicle according to the present invention for the above object includes a motor; Engine; A battery provided to supply power to the motor; A high speed set in advance to determine whether the driver's driving tendency is a moderate driving tendency based on the average vehicle speed of the vehicle, the battery charging state, and the accelerator pedal operation amount, and to consider the moderate driving tendency when the driving tendency of the driver is the moderate driving tendency. And a control unit for controlling the driving of the vehicle in a driving mode.

In the vehicle control method described above, the controller divides the average vehicle speed of the vehicle into a plurality of preset sections, and determines which section of the plurality of sections belongs to the average speed of the vehicle during a preset time period.

In the vehicle control method described above, the control unit predicts whether the vehicle will enter either an EV mode running only with the motor or an HEV mode running using both the engine and the motor based on the average vehicle speed.

In the vehicle control method described above, the controller divides the battery charge state into a plurality of sections corresponding to each of a plurality of sections of the average vehicle speed, and determines which section of the plurality of sections the battery charge state belongs to. .

In the vehicle control method described above, the control unit predicts whether the vehicle will enter either an EV mode running only with the motor or an HEV mode running using both the engine and the motor through the battery charging state. .

In the vehicle control method described above, the controller determines that the driving tendency of the driver is a moderate tendency when the accelerator pedal operation amount is less than or equal to a preset operation amount.

In the vehicle control method described above, the control unit predicts whether the vehicle will enter either an EV mode running only with the motor or an HEV mode running using both the engine and the motor through the accelerator pedal operation amount. .

In the vehicle control method described above, controlling the vehicle includes controlling the number of transmission stages of the vehicle and the number of revolutions (rpm) of the engine.

Another vehicle control method according to the present invention for the above-described object includes the steps of detecting an average vehicle speed of the vehicle, a state of charge of a battery, and an accelerator pedal operation amount; Determining that the driving tendency of the driver is a moderate tendency when the average vehicle speed, the battery charging state, and the accelerator pedal operation amount satisfy a preset condition; And controlling the driving of the vehicle in a preset high-speed driving mode to consider the moderate driving tendency when the driving tendency of the driver is the moderate driving tendency.

Another vehicle according to the present invention for the above object includes a motor; Engine; A battery provided to supply power to the motor; The average vehicle speed, the battery charge state, and the accelerator pedal operation amount of the vehicle are detected, and when the average vehicle speed, the battery charge state, and the accelerator pedal operation amount satisfy a preset condition, it is determined that the driving tendency of the driver is a moderate tendency, and the And a controller for controlling the driving of the vehicle in a preset high-speed driving mode to consider the moderate driving tendency when the driver's driving tendency is the moderate driving tendency.

According to an aspect of the present invention, when a hybrid vehicle transitions between an HEV mode and an EV mode, a driving system of the vehicle is operated in an optimal driving range to improve fuel economy.

1 is a view showing a vehicle according to an embodiment of the present invention.
2 is a view showing a power system of a vehicle according to an embodiment of the present invention.
3 is a view showing a vehicle control method according to an embodiment of the present invention.
4 is a diagram showing a preset section (range) of an average vehicle speed according to an embodiment of the present invention.
5 is a diagram illustrating a preset section (range) of an SOC according to an embodiment of the present invention.
6 is a diagram showing a criterion for determining a'moderate driver' according to an embodiment of the present invention.

The same reference numerals refer to the same elements throughout the specification. This specification does not describe all elements of the embodiments, and general content or content overlapping between the embodiments in the technical field to which the present invention pertains will be omitted. The term'unit, module, member, block' used in the specification may be implemented as software or hardware, and according to embodiments, a plurality of'units, modules, members, blocks' may be implemented as one component, It is also possible for one'unit, module, member, block' to include a plurality of components.

Throughout the specification, when a part is said to be "connected" with another part, this includes not only the case of being directly connected, but also the case of indirect connection, and the indirect connection includes connection through a wireless communication network. do.

In addition, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

Throughout the specification, when a member is said to be positioned "on" another member, this includes not only the case where a member is in contact with another member, but also the case where another member exists between the two members.

Terms such as first and second are used to distinguish one component from other components, and the component is not limited by the above-described terms.

Singular expressions include plural expressions, unless the context clearly has exceptions.

In each step, the identification code is used for convenience of explanation, and the identification code does not describe the order of each step, and each step may be implemented differently from the specified order unless a specific sequence is clearly stated in the context. have.

Hereinafter, the operating principle and embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a view showing a vehicle according to an embodiment of the present invention.

The vehicle 100 shown in FIG. 1 is a plug-in hybrid vehicle (PHEV) including both an internal combustion engine engine and an electric motor.

The vehicle 100 is a hybrid vehicle and thus requires a battery 102 to store power for driving a motor (see FIG. 2 ). A battery is provided on one side of the engine room even in a general internal combustion engine vehicle, but since a large-capacity battery is required in the case of a hybrid vehicle, the vehicle 100 according to the exemplary embodiment of the present invention requires relatively more space than the engine room. The battery 102 may be installed in the lower space of the second row passenger seat, which is advantageous.

The power stored in the battery 102 may be used to generate power by driving a motor (208 in FIG. 2). The battery 102 according to the embodiment of the present invention may be a lithium battery.

2 is a view showing a power system of a vehicle according to an embodiment of the present invention.

The control unit 202 may be an Electronic Control Unit (ECU) that controls the overall operation of the vehicle 100 according to an embodiment of the present invention. In an embodiment of the present invention, the control unit 202 drives the driver based on the speed information of the vehicle 100, the state of charge (SOC) information of the battery 102, and the accelerator pedal operation amount information (APS information). The propensity is determined, and an optimal high-speed driving pattern is determined according to the determined driving propensity. Here, the'high-speed driving pattern' refers to a high-speed driving pattern set in advance to consider the moderate driving tendency of the'moderate driver' whose usual driving habit is moderate. Since the'moderate driver' usually has a moderate driving habit, the driving mode (HEV/EV) of the vehicle 100, the type of shifting, and the engine speed (rpm) so that the moderate driver can adequately cope with even high-speed driving. It is desirable to control the back according to the driver's'moderate tendency'. Therefore, in the high-speed driving pattern when the driving tendency of the driver is determined as the'moderate driver', the vehicle 100 is allowed to enter either of the EV mode and the HEV mode, and the number of transmission stages and the engine 204 of the vehicle 100 ) May include controlling the number of revolutions (rpm). The EV mode is a driving mode using only the motor 208, and the HEV mode is a driving mode using both the engine 204 and the motor 208.

SOC (State of Charge) means the current state of charge of the battery 102. That is, it indicates what percentage of the current battery 102 is charged of the total charge capacity. It can be thought of as a fuel gauge for vehicles equipped with an internal combustion engine.

In FIG. 2, the dashed arrows of the controller 202, the battery 102, and the generator 204 indicate the flow of control signals transmitted through the CAN communication network, and the solid arrows indicate the flow of electric power. Is shown.

The engine 204 generates power by burning fuel such as gasoline/diesel.

The generator 206 is connected to the output shaft of the engine 204 to generate electric power by using power generated from the engine 204 as energy to generate electric power.

Battery 102 stores power produced by generator 206. The power stored in the battery 102 is used as driving energy of the motor 210 to be described later.

The inverter 208 converts the voltage of the battery 102 into polyphase AC power (for example, three-phase AC power of U, V, W) according to a control signal generated from a driving unit (not shown), and transmits the voltage to the motor 210. to provide.

The motor 210 is driven by the three-phase AC power of the inverter 208 to generate power (rotation power). The rotational force of the motor 210 is used to rotate the wheels of the vehicle 100.

The DC/DC converter 212 boosts the DC power provided from the battery 102 or the generator 206 to a predetermined level. DC power output from the DC/DC converter 212 is transmitted to various electric elements provided in the vehicle 100.

The memory 214 is for storing data or software/firmware required for the control unit 202 to perform control. In particular, the memory 214 may store speed information of the vehicle 100, state of charge information (SOC information) of the battery 102, and information on an accelerator pedal operation amount (APS information).

3 is a view showing a vehicle control method according to an embodiment of the present invention. In the vehicle control method shown in FIG. 3, the driver's driving tendency is determined based on the speed information of the vehicle 100, the state of charge information (SOC information) of the battery 102, and the accelerator pedal operation amount information (APS information), and the determined Determine the optimal high-speed driving pattern that fits your driving tendency.

The control unit 202 calculates the average vehicle speed Va of the vehicle 100 based on the speed information of the vehicle 100, and a plurality of sections (ranges) (i) (j) in which the calculated average vehicle speed Va is preset. )(k), which section (range) belongs to (312) (314) (316).

4 is a diagram showing a preset section (range) (i) (j) (k) of an average vehicle speed according to an embodiment of the present invention. As shown in Fig. 4, the average vehicle speed Va of the vehicle 100 is defined as '50km/h or less section (i)', '51km/h-70km/h section (j)', '71km/h or more section ( k)'. In this case, since the '50km/h or less section (i)' is a relatively low-speed section, it can be classified into a section with a high possibility of entering the EV mode in which the vehicle 100 runs only with the motor 208. In addition, since the '71km/h or more section (k)' is a relatively high-speed section, it can be classified into a section with a high probability of entering the HEV mode in which the vehicle 100 travels using both the engine 204 and the motor 208.

Returning to FIG. 3, the control unit 202 includes a plurality of sections in which a state of charge (SOC) of the battery 102 is preset based on the state of charge information (SOC information) of the battery 102 provided in the vehicle 100. Range) (X) (Y) (Z), which section (range) belongs to (322) (324) (326).

5 is a diagram showing a preset section (range) (X) (Y) (Z) of an SOC according to an embodiment of the present invention. As shown in FIG. 5, the state of charge of the battery 102 can be divided into a '0-60% section', a '61-70% section', and a '71-100% section'. In this case, the '0-60% section' is a section with a high possibility of entering the HEV mode using both the engine 204 and the motor 208 in order to reduce power consumption because the charging power of the battery 102 is relatively low. Can be distinguished. In addition, since the '71-100% section' is a state in which sufficient power can be supplied because the charging power of the battery 102 is relatively high, it can be divided into a section with a high possibility of entering the EV mode using only the motor 208 without considering power consumption. I can.

Returning to FIG. 3, the controller 202 determines whether the driver of the vehicle 100 is a'submissive driver' (332) (334) (336) (338) (340) (342). The'submissive driver' refers to a driver who refrains from sudden acceleration or speeding when driving the vehicle 100 and drives relatively quietly. The criteria for rapid acceleration and speeding can be classified through the amount of operation of the accelerator pedal. For example, if the accelerator pedal operation amount exceeds a preset size, it is recognized as a sudden acceleration or overspeed.

6 is a diagram showing a criterion for determining a'moderate driver' according to an embodiment of the present invention. As shown in Fig. 6, the operation amount of the accelerator pedal is divided from 0% (operation amount 0) to 100% (maximum operation amount), and if the operation amount of the accelerator pedal is 0-5%, it can be determined that the driver is moderate. The range of the accelerator pedal operation amount for determining the moderate driver is not limited to 0-5%, and may be determined in consideration of overall performance of the vehicle 100 such as the size of the engine output of the vehicle 100 and driving performance. In this case, since a driver's moderate driving tendency can be satisfied with only a relatively small power, it can be regarded as a section with high possibility of driving in the EV mode driving only with the motor 208. On the other hand, if the accelerator pedal operation amount is 6-100%, it can be determined that the driver is not a moderate driver (non-moderate). In this case, it can be said that relatively large power is required to meet the driver's non-moderate (for example, extreme) driving tendency, so there is a possibility of driving in the HEV mode in which the engine 204 and the motor 208 are both used. It can be seen as a high section.

Returning to FIG. 3, the control unit 202 drives the driver based on a plurality of information including the average vehicle speed Va of the vehicle 100, the state of charge (SOC) of the battery 102, and the amount of accelerator pedal operation (APS). Determine whether the propensity is moderate. Since the determination of the driver's driving tendency is based on a plurality of pieces of information, as shown in FIG. 3, judgments of the plurality of moderate drivers may be derived according to whether each condition is satisfied. For example, when the average vehicle speed (Va) is'i section' and the state of charge (SOC) of the battery 102 is'X section' or not'X section', two different types (332) (334) The result of determining the'moderate driver' of can be derived. In addition, when the average vehicle speed Va is'J section' and the state of charge (SOC) of the battery 102 is'Y section' or not'Y section', two different forms 336 and 338 The determination result of'moderate driver' can be derived. In addition, when the average vehicle speed (Va) is'k section' and the state of charge (SOC) of the battery 102 is'Z section' or'Z section', two different forms 340 and 342 are ' The determination result of'moderate driver' can be derived.

The control unit 202 derives a plurality of'moderate drivers' determination results 332, 334, 336, 338, 340, 342 through the same process as shown in FIG. 3, and the current driver If it is determined that the driver is a'moderate driver' ('Yes' for each of 332 to 342), a plurality of'moderate driver' determination results 332, 334, 336, 338, 340, and 342 respectively Determine suitable plurality of high-speed driving patterns (#1) (#2) (#3) (#4) (#5) (#6) (352) (354) (356) (358) (360) (362) ). The'high-speed driving pattern', as described above, refers to a high-speed driving pattern set in advance to consider the moderate driving tendency of a'moderate driver' whose usual driving habit is moderate. Since the'moderate driver' usually has a moderate driving habit, the driving mode (HEV/EV) of the vehicle 100, the type of shifting, and the engine speed (rpm) so that the moderate driver can adequately cope with even high-speed driving. It is desirable to control the back according to the driver's'moderate tendency'. Accordingly, in the high-speed driving pattern when the driver's driving tendency is determined as a'moderate driver', the vehicle 100 is allowed to enter either the EV mode or the HEV mode, and the number of transmission stages and the engine 204 ) May include controlling the number of revolutions (rpm). The EV mode is a driving mode using only the motor 208, and the HEV mode is a driving mode using both the engine 204 and the motor 208. Next, the control unit 202 uses a plurality of high-speed driving patterns (#1) (#2). )(#3)(#4)(#5)(#6), the vehicle 100 is controlled to drive in a preset high-speed driving pattern suitable for the driving tendency of the current driver (372).

Alternatively, if it is determined that the driver is not a “moderate driver” (“No” for each of 332 to 342), the control unit 202 maintains the existing driving pattern (382).

Meanwhile, the disclosed embodiments may be implemented in the form of a recording medium storing instructions executable by a computer. The instruction may be stored in the form of a program code, and when executed by a processor, a program module may be generated to perform the operation of the disclosed embodiments. The recording medium may be implemented as a computer-readable recording medium.

Computer-readable recording media include all kinds of recording media in which instructions that can be read by a computer are stored. For example, there may be read only memory (ROM), random access memory (RAM), magnetic tape, magnetic disk, flash memory, optical data storage device, and the like.

The disclosed embodiments have been described with reference to the accompanying drawings. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be practiced in a form different from the disclosed embodiments without changing the technical spirit or essential features of the present invention. The disclosed embodiments are illustrative and should not be construed as limiting.

100: vehicle
102: battery
202: control unit (ECU)
204: engine
206: generator
208: inverter
210: motor
212: DC/DC converter
214: memory

Claims (18)

Determining whether the driver's driving tendency is a moderate driving tendency based on an average vehicle speed of the vehicle, a state of charge of the battery, and an accelerator pedal operation amount;
And controlling the driving of the vehicle in a preset high-speed driving mode to consider the moderate driving tendency when the driving tendency of the driver is the moderate driving tendency. The method of claim 1,
A vehicle control method for dividing the average vehicle speed of the vehicle into a plurality of preset sections, and determining which section of the plurality of sections belongs to the average speed of the vehicle during a preset time period. The method of claim 2,
A vehicle control method for predicting whether the vehicle will enter one of an EV mode running only with a motor and an HEV mode running using both an engine and the motor through the average vehicle speed. The method of claim 2,
A vehicle control method for dividing the battery charging state into a plurality of sections corresponding to each of a plurality of sections of the average vehicle speed, and determining which section of the plurality of sections the battery charging state belongs. The method of claim 4,
A vehicle control method for predicting whether the vehicle will enter into one of an EV mode driving only with a motor and an HEV mode driving using both an engine and the motor through the battery charging state. The method of claim 1,
A vehicle control method for determining that the driving tendency of the driver is moderate when the accelerator pedal operation amount is less than or equal to a preset operation amount. The method of claim 6,
A vehicle control method for predicting whether the vehicle will enter one of an EV mode running only with a motor and an HEV mode running using both an engine and the motor through the accelerator pedal operation amount. The method of claim 1, wherein the control of the vehicle,
A vehicle control method comprising controlling the number of transmission stages of the vehicle and the number of revolutions (rpm) of the engine. With a motor;
Engine;
A battery provided to supply power to the motor;
A high speed set in advance to determine whether the driver's driving tendency is a moderate driving tendency based on the average vehicle speed of the vehicle, the battery charge state, and the accelerator pedal operation amount, and to consider the moderate driving tendency when the driving tendency of the driver is the moderate driving tendency. A vehicle comprising a control unit for controlling the driving of the vehicle in a driving mode. The method of claim 9, wherein the control unit,
A vehicle for dividing the average vehicle speed of the vehicle into a plurality of preset sections, and determining which section of the plurality of sections belongs to the average speed of the vehicle during a preset time period. The method of claim 10, wherein the control unit,
A vehicle for predicting whether the vehicle will enter one of an EV mode running only with the motor and an HEV mode running using both the engine and the motor through the average vehicle speed. The method of claim 10, wherein the control unit,
A vehicle for dividing the battery charging state into a plurality of sections corresponding to each of a plurality of sections of the average vehicle speed, and determining which section of the plurality of sections belongs to the battery charging state. The method of claim 12, wherein the control unit,
A vehicle for predicting whether to enter one of an EV mode in which the vehicle runs only with the motor and an HEV mode in which the vehicle runs using both the engine and the motor through the battery charging state. The method of claim 9, wherein the control unit,
A vehicle for determining that the driving tendency of the driver is moderate when the accelerator pedal operation amount is less than or equal to a preset operation amount. The method of claim 14, wherein the control unit,
A vehicle for predicting whether the vehicle will enter into one of an EV mode running only with the motor and an HEV mode running using both the engine and the motor through the accelerator pedal operation amount. The method of claim 9, wherein the control of the vehicle,
And controlling the number of transmission stages of the vehicle and the number of revolutions (rpm) of the engine. Detecting an average vehicle speed of the vehicle, a state of charge of the battery, and an accelerator pedal operation amount;
Determining that the driving tendency of the driver is a moderate tendency when the average vehicle speed, the battery charging state, and the accelerator pedal operation amount satisfy a preset condition;
And controlling the driving of the vehicle in a preset high-speed driving mode to consider the moderate driving tendency when the driving tendency of the driver is the moderate driving tendency. With a motor;
Engine;
A battery provided to supply power to the motor;
The average vehicle speed, the battery charge state, and the accelerator pedal operation amount of the vehicle are detected, and when the average vehicle speed, the battery charge state, and the accelerator pedal operation amount satisfy a preset condition, it is determined that the driving tendency of the driver is a moderate tendency, and the And a controller for controlling the driving of the vehicle in a high-speed driving mode set in advance to consider the moderate driving tendency when the driver's driving tendency is the moderate driving tendency.

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