KR102370971B1 - appratus for controlling a driving mode for plug-in hybrid vehicle and a method the same - Google Patents

Abstract

The present invention sets the driving mode of the vehicle in consideration of the elevation difference on the driving route. The calculation is performed considering the amount of SOC used from the time of calculation to the downhill road and the amount of SOC recovered through regenerative braking of the vehicle in the downhill road section. It relates to a technology for setting a vehicle to perform a CD driving mode from a starting point to a downhill road section. A driving mode conversion control apparatus and control method of a plug-in hybrid vehicle according to an embodiment of the present invention includes: a navigation system for outputting a driving route including a gradient according to a destination input of the vehicle; and a control unit configured to receive the driving route from the navigation and convert the CD driving mode and the CS driving mode to each other in consideration of the charge amount of the high voltage battery, wherein the control unit includes: and a driving mode conversion control device of the plug-in hybrid vehicle configured to maintain the CD driving mode in the downhill road section even when the current SOC is equal to or less than the CD/CS driving mode conversion SOC.

Description

A driving mode conversion control apparatus and control method of a plug-in hybrid vehicle TECHNICAL FIELD

The present invention relates to an apparatus and control method for changing a driving mode of a plug-in hybrid vehicle, and more preferably, to a technology for converting a driving mode in consideration of a gradient on a driving route. It relates to an efficient driving mode conversion control apparatus and control method based on a driving route by controlling the amount of charge.

A hybrid vehicle system includes an engine and a motor as a driving source for vehicle driving, and includes an inverter, a DC/DC converter, a high voltage battery, etc. Control Unit) and BMS (Battery Management System).

The high-voltage battery is an energy source that drives the motor and DC/DC converter of the hybrid vehicle, and its controller BMS (Battery Management System) monitors the high-voltage battery voltage, current, and temperature, and the charge amount (SOC [%] ( State of Charge)).

As is well known, the main driving modes of a hybrid vehicle based on such a configuration include an electric vehicle mode, which is a pure electric vehicle mode using only motor power, and a rotational force of the motor while using the rotational power of the engine as the main power. Including a hybrid electric vehicle, which is an auxiliary mode used as power, wherein the hybrid driving mode recovers braking and inertia energy of the vehicle through power generation from the motor and charging the battery when driving by braking or inertia of the vehicle It includes a regenerative braking (RB) mode.

Furthermore, with the recent advent of plug-in hybrids, a CD driving mode (hereinafter, CD driving mode) accompanied by consumption of the battery charge amount and a CS driving mode (hereinafter, CS driving mode) for maintaining the battery charge amount ), research on vehicles that drive using

As such, the high voltage battery of the plug-in hybrid vehicle can be charged from an external power source. However, there are practical limitations on the pure electric driving distance that can be moved by the amount of battery charge through external charging. Accordingly, after driving in the CD driving mode in which the driving battery charge amount (SOC) is consumed above the preset battery charge amount, the vehicle is driven in the CS driving mode driving mode in which the battery charge is maintained below the preset battery charge amount.

Among the methods for improving the fuel efficiency of hybrid vehicles, when the vehicle needs to be driven in a low-output region where the engine’s efficiency is poor, a method of changing the output to a high-efficiency section and charging the battery by generating the remaining output with a motor is disclosed. (Republic of Korea Patent No. 10-0491572, hereafter document 1).

That is, since the lower limit of the engine target power is set and the engine is not operated within the low output range where the efficiency with respect to the engine output is low and the efficiency change with respect to the change in the engine output is severe, the engine efficiency is improved and at the same time , the fuel efficiency can be further improved, and since the value at which the efficiency with respect to the engine output becomes the optimum efficiency is set, the fuel efficiency of the engine can be further improved, Disclosed is a hybrid vehicle capable of charging a battery by using excess power.

However, in the case of Document 1, a technology for determining driving conditions and setting a driving mode according to each route is not provided. Furthermore, a technology for setting a driving mode in consideration of a gradient set on a driving path of a vehicle in consideration of a charge amount of a vehicle's battery has not been provided.

Therefore, when the driving mode of the vehicle is simply set in consideration of the charge amount of the high voltage battery, the driving mode is set without considering the charge amount of the high voltage battery according to the gradient, so there is a problem that the fuel efficiency of the plug-in hybrid vehicle cannot be improved. did

The present invention has been devised to solve the above problems, and sets the driving mode of the vehicle in consideration of the elevation difference on the driving route. In consideration of the amount of SOC recovered through the regenerative braking of

In addition, based on the setting of the driving mode in consideration of the downhill road section, the driving mode conversion control device and control method of a plug-in hybrid vehicle that sets the driving mode in consideration of the gradient information of the driving route rather than simply considering only the charge amount of the high voltage battery is to provide

The objects of the present invention are not limited to the above-mentioned objects, and other objects of the present invention not mentioned can be understood by the following description, and can be seen more clearly by the examples of the present invention. In addition, the objects of the present invention can be realized by means and combinations thereof indicated in the claims.

A driving mode conversion control apparatus and control method of a plug-in hybrid vehicle for achieving the above object of the present invention includes the following configuration

a navigation system that outputs a driving route including a gradient according to a destination input of the vehicle; and a control unit configured to receive the driving route from the navigation and convert the CD driving mode and the CS driving mode to each other in consideration of the charge amount of the high voltage battery, wherein the control unit includes: The present invention provides a driving mode change control apparatus for a plug-in hybrid vehicle, configured to maintain the CD driving mode in the downhill road section even when the current SOC is equal to or less than the CD/CS driving mode conversion SOC.

In addition, the control unit is configured to maintain the CD driving mode even at or below the CD/CS driving mode conversion SOC. It provides a driving mode conversion control device of a plug-in hybrid vehicle, characterized in that configured.

(SOC: The amount of charge of the high-voltage battery at the current position (calculation time), SOC1: The amount of charge of the high-voltage battery consumed from the current position (the time of calculation) before entering the downhill road section, SOC2: The charge amount charged by regenerative braking when entering the downhill road section SOC2 )

In addition, the control unit converts the CD/CS driving mode only when the difference between the SOC at the current location and the CD/CS driving mode conversion SOC is smaller than the amount of charge SOC1 of the high voltage battery consumed from the current location before entering the downhill road section. There is provided a driving mode conversion control device for a plug-in hybrid vehicle, characterized in that it is configured to maintain the CD driving mode even under SOC.

의 합과 동일한지 판단하는 단계; 2) 상기 1) 단계를 만족하지 못하는 경우, 로직을 종료하고, 상기 1) 단계를 만족하는 경우, 주행 경로 전방에 내리막 도로 구간이 존재하는지 판단하는 단계; 3) 상기 2) 단계를 만족하지 못하는 경우, 로직을 종료하고, 상기 2)단계를 만족하는 경우, 현재 차량의 SOC가 상기 CD/CS 주행모드 변환 SOC 이하인 경우에도 상기 내리막 도로 구간에서 CD 주행모드를 유지하도록 구성되는 플러그인 하이브리드 차량의 주행모드 변환 제어방법을 제공한다.In addition, 1) CD/CS driving mode conversion SOC and calculation time preset in the control unit for the SOC of the current location

determining whether it is equal to the sum of 2) if step 1) is not satisfied, terminating the logic, and if step 1) is satisfied, determining whether a downhill road section exists in front of the driving route; 3) If step 2) is not satisfied, the logic is terminated, and if step 2) is satisfied, the CD driving mode in the downhill section even if the current vehicle SOC is less than or equal to the CD/CS driving mode conversion SOC To provide a driving mode conversion control method of a plug-in hybrid vehicle configured to maintain

In addition, in step 3),

보다 큰 경우인지 판단하는 단계; 3-3)상기 3-2) 단계를 만족하지 못하는 경우, 로직을 종료하고, 상기 3-2) 단계를 만족하는 경우, 내리막 도로 구간 진입시 회생제동으로 충전되는 충전량 SOC2을 연산하는 단계; 3-4) 상기 연산시점

, 상기 연산된 SOC1 및 상기 연산된 SOC2값들의 일정 조건을 만족하는 경우, 내리막 도로 진입 이전에 CD 주행모드를 유지하는 것을 특징으로 하는 플러그인 하이브리드 차량의 주행모드 변환 제어방법을 제공한다.In the configuration to maintain the CD driving mode even at the CD/CS driving mode conversion SOC or lower, 3-1) calculating SOC1 consumed from the current position of the vehicle before entering the downhill section; 3-2) The calculated SOC1 value is the calculation time

determining whether the case is greater than; 3-3) if step 3-2) is not satisfied, terminating the logic, and if step 3-2) is satisfied, calculating the amount of charge SOC2 charged by regenerative braking when entering a downhill road section; 3-4) the above calculation time

, when a predetermined condition of the calculated SOC1 and the calculated SOC2 values is satisfied, the driving mode conversion control method of a plug-in hybrid vehicle, characterized in that the CD driving mode is maintained before entering the downhill road.

, 상기 연산된 SOC1 및 연산된 SOC2값들의 일정 조건의 경우, 아래 수학식에 의해 산출되는 조건을 만족하는 경우, 상기 내리막 도로 구간에서 CD 주행모드를 유지하도록 구성되는 것을 특징으로 하는 것을 특징으로 하는 플러그인 하이브리드 차량의 주행모드 변환 제어방법을 제공한다.In addition, the calculation time in 3-4) above

, characterized in that in the case of a certain condition of the calculated SOC1 and calculated SOC2 values, the CD driving mode is maintained in the downhill road section when the condition calculated by the following equation is satisfied. A driving mode conversion control method of a plug-in hybrid vehicle is provided.

: 연산시점을 결정하는 설정값, SOC1: 현 위치부터 내리막 도로 구간 진입 이전까지 소모되는 고전압배터리의 충전량, SOC2: 내리막 도로 구간 진입시 회생제동으로 충전되는 충전량)
(

: A set value that determines the time of calculation, SOC1: Amount of high-voltage battery consumed from the current location before entering a downhill section, SOC2: Amount of charge charged by regenerative braking when entering a downhill section)

The present invention is a technology for setting a driving path in consideration of driving conditions of a plug-in hybrid vehicle, by setting a driving path including a gradient and setting a driving mode of the vehicle according to a section on the driving path, thereby improving the driving efficiency of the driver. can be stocked

In addition, when the driving mode is set by reflecting the gradient of the driving route, the vehicle is driven in the CD driving mode from the viewpoint of fuel efficiency and high power and high speed driving are required from the viewpoint of efficient operation of the vehicle's battery charge, CS Since the vehicle is driven in the driving mode, there is an effect of providing vehicle performance that meets the driving request of the driver.

In addition, the driving mode is set by reflecting the gradient, and the driving mode conversion standard and time point are changed to perform the driving mode conversion from the CD driving mode to the CS driving mode. exists

1 is a block diagram of a driving mode change control apparatus of a plug-in hybrid vehicle as an embodiment of the present invention.
FIG. 2 shows a driving mode change point of the plug-in hybrid vehicle as an embodiment of the present invention.
3 is a prior art, and shows a configuration for changing the driving mode at a preset SOC reference point.
4 illustrates a position at which a driving mode conversion time point is changed according to a driving gradient of a plug-in hybrid vehicle as an embodiment of the present invention.
5 is a flowchart illustrating a driving mode change control method of a plug-in hybrid vehicle as an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in more detail with reference to the accompanying drawings. Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the following embodiments. This embodiment is provided to more completely explain the present invention to those of ordinary skill in the art.

In the driving mode of the present invention, in the case of the electric driving mode, the driving mode in which driving power is obtained by the motor 20 generated by the high voltage battery 40 and driven by receiving electric energy through an inverter and a DC/DC converter means That is, as the driving mode using pure electric energy, the pure electric driving distance is set according to the amount of charge of the high voltage battery 40 capable of external charging.

Unlike this, in the case of the hybrid driving mode, it means a driving mode in which power is obtained through driving of the engine 30 . In this way, driving according to the hybrid driving mode performs battery charging through regenerative braking in order to charge the high voltage battery 40 constant.

In addition, in the case of a plug-in hybrid vehicle, a CD driving mode (charge depeleting: CD driving mode) in which the vehicle is driven by exhausting the battery charge is included, and the CS driving mode is driven while maintaining the battery charge amount below a preset battery charge amount. (charge sustaining: CS driving mode) exists.

As described above, when driving in the current CD driving mode, when the current SCO amount is the same as the charge amount of the high voltage battery 40 performing the driving mode change, the CD driving mode of the vehicle is switched to the CS driving mode, the battery Switch the driving mode to maintain the charge.

Furthermore, in the prior art, the CD/CS driving mode conversion was performed in consideration of only the charge amount of the high voltage battery 40 without considering the gradient on the driving path, and thus the actual path could not be reflected.

1 is a block diagram of a driving mode conversion control apparatus of a plug-in hybrid vehicle as an embodiment of the present invention.

As shown, in the case of the driving mode conversion control device of the plug-in hybrid vehicle, it includes a motor 20 and an engine 30 that provide driving force of the vehicle, and telematics to set the driving route of the vehicle according to the user's input information. A control unit capable of measuring the charge amount of the communication-enabled navigation device 50 and the high voltage battery 40, switching the driving mode to the measured charge amount, and setting the driving mode on the driving route according to the gradient driving condition received through telematics (10).

The controller 10 receives the destination data of the navigation device 50 and serves to receive driving conditions through telematics communication. The navigation 50 may use an ADAS map.

In the case of the navigation 50 using the high-precision map, it may be provided to the vehicle including the elevation difference on the driving route and the gradient condition of the road.

The control unit 10 is configured to include a hybrid control unit (HCU), a motor control unit (MCU), a battery management system (BMS), and the like.

The control unit 10 receives the charge amount of the high voltage battery 40 and stores the charge amount of the high voltage battery 40 for performing the preset driving mode conversion. The received high voltage battery 40 charge amount SOC is preset. It performs a function of converting the CD driving mode to the CS driving mode when the amount of charge of the high voltage battery 40 performing the set driving mode switching is less than that of the high voltage battery 40 .

In addition, the controller 10 may receive the driving route according to the input of the navigation 50 , and further, based on the driving route including the gradient information, may receive location information at which the downhill road section starts, and further, the downhill road section may receive location information. It is possible to receive road information such as a slope and a length of a road section.

Furthermore, the control unit 10 can calculate SOC1, which is the charge amount of the high voltage battery 40 used up to the downhill road section, for the vehicle currently driving in the CD driving mode, and enters the downhill road section to obtain by regenerative braking. A possible high-voltage battery 40 charge amount SOC2 can be calculated.

Furthermore, the control unit 10 is configured to maintain the CD driving mode even at or below the CD/CS driving mode conversion SOC through the received and calculated high voltage battery 40 charge amount data, the condition of Equation 1 is satisfied. In this case, it is set to maintain the CD driving mode while passing through the downhill road section.

(SOC: the amount of charge of the high-voltage battery 40 at the current location, SOC1: the amount of charge of the high-voltage battery 40 consumed from the current location before entering the downhill road section, SOC2: the high-voltage battery (40) charged with regenerative braking when entering the downhill road section ) of charge)

FIG. 2 discloses a technique for performing an operation when a preset charge amount of a high voltage battery 40 and a current charge amount of the high voltage battery 40 are the same as an embodiment of the present invention.

That is, as shown, the calculation is performed at the same point in time when the vehicle's current high voltage battery 40 charge amount SOC is equal to the high and low voltage battery charge amount preset in the control unit 10, and the SOC used until the downhill road section starts A configuration is disclosed in which SOC1 is calculated as a value, and SOC2 value is calculated as a charging SOC value obtainable by regenerative braking of the vehicle in a downhill road section.

를 합한 값으로 설정된다.That is, the SOC value at the time of calculation is the CS/CD driving mode switching SOC value preset in the control unit 10 and an arbitrary set value that determines the time of calculation.

is set as the sum of

값은 시험 및 평가를 통해 적정값으로 설정되는바, 일반적으로 최대 충전 SOC값의 3에서 5%로 설정할 수 있다.More preferably,

The value is set to an appropriate value through testing and evaluation, and can generally be set to 3 to 5% of the maximum charging SOC value.

값과, 현재 차량이 내리막 도로 구간 이전까지 사용하는 충전량 SOC1 및 내리막 도로 구간에 의해 충전되는 SOC2값의 합이 0보다 큰 경우, 내리막 도로 구간에서 CD/CS 주행모드 전환 SOC값에 도달하더라도, CS 주행모드를 전화하지 않고 CD 주행모드를 유지하여 주행을 수행하도록 구성된다.As described above, the set calculation time

If the sum of the value and the current vehicle's charging amount SOC1 used before the downhill section and the SOC2 value charged by the downhill section is greater than 0, even if the CD/CS driving mode conversion SOC value is reached in the downhill section, CS It is configured to perform driving by maintaining the CD driving mode without changing the driving mode.

That is, as described above, by maintaining the CS driving mode, unnecessary switching of the driving mode of the CS driving mode may not be performed, thereby providing an effect of improving fuel efficiency on the road.

보다 큰 경우에만 적용이 되는바, 이는 SOC1이

보다 작을 경우, CD/CS 주행모드 전환 SOC에 도달하지 않아 CD 주행모드 주행을 유지되기 때문이다.However, in the case of driving while maintaining the CD driving mode up to the downhill road section as described above, SOC1 is

It is applied only in the case of greater than SOC1

This is because, if it is smaller than the CD/CS driving mode switching SOC, the CD driving mode driving is maintained.

3 is a prior art, and discloses a CD/CS driving mode switching section when the gradient is not taken into account.

3, the CD section is maintained until the point where the CD/CS driving mode conversion SOC and the vehicle SOC meet before the downhill road section starts, and the CD/CS driving mode conversion SOC and the vehicle SOC meet After the point, the configuration for performing the CS driving mode is disclosed.

As such, the vehicle is set to be switched to the CS driving mode before the downhill road section, and the CD driving mode and the CS driving mode are set without considering the amount of charge due to regenerative braking obtained in the downhill road section.

4 shows a driving mode conversion control method of a plug-in hybrid vehicle of the present invention having a predetermined calculation time in consideration of a downhill road section, compared with FIG. 3 .

를 연산하고, 연산된

과 내리막 도로 구간까지 CD주행으로 사용되는 SOC의 충전량인 SOC1 및 내리막 도로 구간에서 차량의 회생제동에 의해 획득되는 충전량 SOC2를 연산하는 과정을 수행한다.As shown, the calculation point is at a preset position before the downhill section, and an arbitrary set value that is the difference between the SOC of the vehicle's SOC and the CD/CS driving mode conversion SOC.

computed, and the calculated

The process of calculating SOC1, which is the charge amount of SOC used for CD driving, and SOC2, the charge amount obtained by regenerative braking of the vehicle in the downhill road section, is performed.

-SOC1+SOC2 값이 0보다 큰 경우, 차량의 SOC가 CD/CS 주행모드 전환 SOC보다 낮은 경우에도 CD 주행모드를 유지하여 내리막 구간을 통과하는 구성을 개시하고 있다.through the above calculation process

When the value of -SOC1+SOC2 is greater than 0, even when the vehicle's SOC is lower than the CD/CS driving mode switching SOC, the CD driving mode is maintained to pass through the downhill section.

That is, in the case of the driving mode switching configuration disclosed in FIG. 4 , compared to FIG. 3 , the configuration for switching to the CS driving mode after passing the downhill road section is disclosed, and the configuration for maintaining the CD driving mode including the downhill road section is starting

5 is a flowchart illustrating a driving mode change control method of a plug-in hybrid vehicle according to the present invention.

의 합인지 판단하는 단계를 수행한다(S10). 즉 미리 설정된

값은 연산시점을 설정하기 위해 사용자의 실험 및 평가를 통해 설정된 값으로서, 통상 최대 충전량 SOC의 3~5%로 설정될 수 있다. At the time of calculation, the current SOC charge is equal to the CD/CS conversion SOC

A step of determining whether it is the sum of (S10) is performed. i.e. preset

The value is a value set through a user's experiment and evaluation to set the calculation time, and may be usually set to 3 to 5% of the maximum charging amount SOC.

의 합이 아닌 경우, 로직을 종료하고, 연산시점에서 현재 SOC 충전량이 CD/CS전환 SOC와

의 합인지 판단하는 단계를 만족하는 경우, 주행 경로 전방에 내리막 도로가 존재하는지 판단하는 단계를 수행한다(S20).Hereinafter, at the time of calculation, the current SOC charge amount is equal to the CD/CS conversion SOC

If it is not the sum of , the logic is terminated, and the current SOC charge amount is equal to the CD/CS conversion SOC at the time of calculation.

If the step of determining whether the sum of , is satisfied, a step of determining whether a downhill road exists in front of the driving path is performed (S20).

If there is no downhill road ahead of the driving path, the logic is terminated, and if there is a downhill road ahead of the driving path, SOC consumption SOC1 consumed from the current position (calculation time) before entering the downhill road is calculated (S30 ).

가 SOC1 이하의 값을 갖는지 판단하는 단계를 수행한다(S40). 상기

가 SOC1 이하의 값을 갖지 않는 경우, 로직을 종료하고,

가 SOC1 이하의 값을 갖는 경우, 내리막 도로 구간에서 회생제동으로 충전되는 SOC의 양인 SOC2 량을 연산하는 단계를 수행한다(S50).After calculating SOC1,

A step of determining whether has a value less than or equal to SOC1 is performed (S40). remind

does not have a value less than or equal to SOC1, exit the logic,

If has a value less than or equal to SOC1, a step of calculating the amount of SOC2, which is the amount of SOC charged by regenerative braking in the downhill road section, is performed (S50).

-SOC1+SOC2가 0보다 큰 값을 갖는지 판단하는 단계(S60)를 수행한다.

-SOC1+SOC2 값이 0보다 작은 값을 갖는 경우, 로직을 종료하고,

-SOC1+SOC2가 0보다 큰 값을 갖는 경우, 내리막 도로 진입 전 CS 주행모드로 전환을 금지(S70)하도록 설정한다.After calculating the SOC2 charge,

- A step (S60) of determining whether SOC1+SOC2 has a value greater than 0 is performed.

-If the value of SOC1+SOC2 has a value less than 0, exit the logic,

-If SOC1+SOC2 has a value greater than 0, it is set to prohibit the transition to the CS driving mode before entering the downhill road (S70).

As described above, in the present invention, the CD/CS driving mode conversion of the plug-in hybrid is performed according to the driving route received through the navigation 50, and the CD driving mode is converted to the CS driving mode based on the gradient information included in the driving route. It provides a transition method that delays the transition time after driving downhill.

The above detailed description is illustrative of the present invention. In addition, the above description shows and describes preferred embodiments of the present invention, and the present invention can be used in various other combinations, modifications, and environments. That is, changes or modifications are possible within the scope of the concept of the invention disclosed herein, the scope equivalent to the described disclosure, and/or within the scope of skill or knowledge in the art. The described embodiment describes the best state for implementing the technical idea of the present invention, and various changes required in specific application fields and uses of the present invention are possible. Accordingly, the detailed description of the present invention is not intended to limit the present invention to the disclosed embodiments. Also, the appended claims should be construed to include other embodiments.

10: control
20: motor
30: engine
40: high voltage battery
50: navigation

Claims (6)

a navigation system that outputs a driving route including a gradient according to a destination input of the vehicle;
a control unit configured to receive a driving route from the navigation system and convert the driving route into a CD driving mode and a CS driving mode in consideration of the charge amount of the high voltage battery;
The control unit is configured to maintain the CD driving mode in the downhill road section, even if the current SOC is equal to or less than the CD/CS driving mode conversion SOC when there is a downhill road section on the driving route, and the SOC at the time of calculation and A plug-in configured to maintain the CD driving mode even below the CD/CS driving mode conversion SOC only when the difference from the CD/CS driving mode conversion SOC is less than the amount of charge SOC1 of the high voltage battery consumed from the current location to before entering the downhill road section A driving mode change control device for a hybrid vehicle.
The method of claim 1,
The control unit is configured to maintain the CD driving mode even below the CD/CS driving mode conversion SOC,
When the condition of the following equation is satisfied, the driving mode conversion control apparatus of a plug-in hybrid vehicle, characterized in that it is configured to maintain the CD driving mode even at or below the CD/CS driving mode conversion SOC.

(SOC: the amount of charge of the high-voltage battery at the current position (calculation time),
SOC1: The amount of charge of the high-voltage battery consumed from the current location (at the time of calculation) to before entering the downhill section,
SOC2: The amount of charge charged by regenerative braking when entering the downhill road section SOC2)
delete 1) CD/CS driving mode conversion SOC and calculation time point where SOC of the current position is preset in the control unit

determining whether it is equal to the sum of
2) if step 1) is not satisfied, terminating the logic, and if step 1) is satisfied, determining whether a downhill road section exists in front of the driving route;
3) If step 2) is not satisfied, the logic is terminated, and if step 2) is satisfied, the CD driving mode in the downhill section even if the current vehicle SOC is less than or equal to the CD/CS driving mode conversion SOC is configured to maintain
In step 3) above,
In the configuration to maintain the CD driving mode even below the CD/CS driving mode conversion SOC,
3-1) calculating SOC1 consumed from the current location of the vehicle before entering the downhill road section;
3-2) The calculated SOC1 value is the calculation time

determining whether the case is greater than;
3-3) if step 3-2) is not satisfied, terminating the logic, and if step 3-2) is satisfied, calculating the amount of charge SOC2 charged by regenerative braking when entering a downhill road section;
3-4) the above calculation time

, when certain conditions of the calculated SOC1 and the calculated SOC2 values are satisfied, the CD driving mode is maintained before entering the downhill road.
delete 5. The method of claim 4,
The calculation time in 3-4) above

, in the case of a certain condition of the calculated SOC1 and calculated SOC2 values,
The driving mode conversion control method of a plug-in hybrid vehicle, characterized in that it is configured to maintain the CD driving mode in the downhill road section when the condition calculated by the following equation is satisfied.

(

: Setting value that determines the time of calculation,
SOC1: The amount of charge of the high-voltage battery consumed from the current location before entering the downhill section,
SOC2: The amount of charge charged by regenerative braking when entering the downhill road section)

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