KR101459856B1 - Method for controlling hybrid vehicle - Google Patents

Abstract

A checking step of checking whether a driving destination is specified; A calculation step of calculating a traveling energy required for traveling the EV when the traveling destination is designated and comparing the travel energy with the SOC; Suggesting that the electric charging station should be used as a diesel destination when the SOC is insufficient; And a downward step of lowering the entry SOC to the CS mode to the lowest value when the electric charging station is selected as the diesel destination.

Description

[0001] METHOD FOR CONTROLLING HYBRID VEHICLE [0002]

The present invention relates to a driving control method of a hybrid vehicle capable of preventing unnecessary engine starting by varying a CS MODE entry SOC that distinguishes a CD / CS mode according to a situation.

In the case of a hybrid vehicle, it is divided into two modes, CD (Charge Depletion) and CS (Charge Sustaining), depending on the SOC (state of charge) of the battery.

Specifically, the CD mode is driven by an electric motor through only the discharge of the battery from the maximum SOC region of the battery (eg, 90%) to the CS MODE entry SOC (eg, 30%).

In a system in which the motor size is unsatisfied with the maximum required torque, the engine can be used for satisfying the required torque, but is usually driven only by a motor.

On the other hand, when CS mode enters SOC (eg 30%), CS mode means driving in HEV mode using engine and motor at the same time.

Accordingly, the entering SOC into the CS mode is determined in advance according to the required performance of the vehicle, the performance of the motor and the battery, and the minimum SOC indicating the limit line at a level lower than the entering SOC is determined separately. .

The present invention relates to a traveling mode control method of a plug-in hybrid vehicle, and more particularly to a method of controlling a traveling mode of a plug-in hybrid vehicle, (Hybrid vehicle) in which the EV first driving mode and the HEV first driving mode are arbitrarily selected or automatically selected according to the running distance to the destination (SOC [%] (State of Charge)) and the destination, A step of determining whether to drive the plug-in hybrid vehicle in the EV first driving mode or the HEV first driving mode, and when the EV first driving mode is determined, the SOC EV A first driving mode use region is set to a level lowered to a minimum HEV driving region; The engine is turned on only when the demanded power of the driver requires the power of the motor alone, and the EV preferential traveling mode is continued under the other conditions, and when the HEV preferential driving mode is determined, And the vehicle is driven in the HEV preferential driving mode. The present invention provides a driving mode control method of a plug-in hybrid vehicle, comprising:

However, even with this conventional technique, there is not proposed a control method of a vehicle that can control the driver's will more in accordance with the driving destination and at the same time ensure the stability of the vehicle.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

KR 10-0867808 B1

SUMMARY OF THE INVENTION It is an object of the present invention to provide a driving control method of a hybrid vehicle capable of preventing unnecessary engine starting by varying a CS MODE entry SOC that distinguishes a CD / CS mode according to a situation .

According to another aspect of the present invention, there is provided a driving control method for a hybrid vehicle, the method comprising: checking whether a driving destination is designated; A calculation step of calculating a traveling energy required for traveling the EV when the traveling destination is designated and comparing the travel energy with the SOC; Suggesting that the electric charging station should be used as a diesel destination when the SOC is insufficient; And a downward step of lowering the entry SOC to the CS mode to the lowest value when the electric charging station is selected as the via destination.

And a confirming step of confirming whether or not the EV enforcement mode is selected.

The checking step may further include a downward step of lowering the entry SOC to the CS mode to the lowest value when the EV forcing mode is selected.

The comparing step may further include a downward step of lowering the entry SOC to the CS mode to a minimum value when the SOC is sufficient.

The downward step may further include a maintenance step of keeping the entry SOC into the CS mode at the normal value when the electric charging station is not selected as the light oil destination.

In other words, the driving control method of the hybrid vehicle of the present invention calculates the travel energy required for EV traveling to the destination when the travel destination is designated on the navigation, compares the travel energy with SOC, suggests the electric filling station as the light oil destination, And when the electric charging station is selected as the light oil destination, the entering SOC to the CS mode is lowered to the lowest value.

According to the running control method of the hybrid vehicle having the above-described structure, unnecessary start-up of the engine is prevented, thereby improving fuel economy and preserving the environment.

In addition, by implementing the EV mode or the HEV mode in conjunction with the navigation destination of the user, it is possible to effectively comply with the intention of the driver and to compare the traveling energy, thereby ensuring the stability and efficiency of battery operation.

1 is a flowchart of a driving control method of a hybrid vehicle according to an embodiment of the present invention;
2 to 4 are graphs showing a battery SOC according to a running control method of a hybrid vehicle according to the present invention.

Hereinafter, a driving control method of a hybrid vehicle according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a flowchart of a driving control method of a hybrid vehicle according to an embodiment of the present invention, and FIGS. 2 to 4 are graphs showing a battery SOC according to a driving control method of the hybrid vehicle of the present invention.

A driving control method of a hybrid vehicle according to the present invention includes a checking step (S200) of checking whether or not a traveling destination is designated; A comparison step (S220) of calculating travel energy required for traveling the EV when the travel destination is designated, and comparing it with SOC; A suggestion step (S240) of suggesting an electric charging station as a light oil destination when the SOC is insufficient; And a downward step S320 of lowering the entry SOC into the CS mode to the lowest value when the electric charging station is selected as the via destination.

The present invention improves fuel economy and preserves the environment by preventing unnecessary start of the engine when the SOC is sufficient, and realizes the EV mode or the HEV mode in cooperation with the navigation destination of the user, thereby effectively meeting the driver's intention, And to ensure the stability and efficiency of battery operation by comparing the energy.

To do this, first, a confirmation step (S100) for confirming whether or not the EV forcing mode is selected is performed. The checking step S100 further includes a downward step S320 of lowering the entering SOC to the CS mode to the lowest value when the EV forcing mode is selected.

That is, when the user forcibly selects the EV enforcement mode by manual, the entry SOC to the CS mode designated as the normal value is set to the minimum value, and the vehicle is driven using only the motor in the EV mode until the SOC drops to the minimum value .

If the EV enforcement mode is not selected, a check step (S200) for checking whether or not the travel destination is designated is performed.

When the driver designates the travel destination, the travel energy required for EV travel is calculated and compared with SOC (S220).

Specifically, the traveling energy required for traveling the EV is consumed energy during traveling of the vehicle, and its calculation method can be found as (motor driving power + auxiliary load power + cooling / heating appliance power consumption) X (total travel distance / average speed).

The motor driving power calculation based on the estimation of the vehicle running resistance can be performed using the vehicle average speed (navigation information), the average gradient (navigation information), and the vehicle weight (based on the two-person boarding). This determines the motor drive torque and average motor speed, and the motor drive power can be obtained.

On the other hand, the auxiliary load consumed power calculation can be obtained by taking the average load of the load field as a constant value through the test.

In case of assuming Auto operation, the consumption power of heating and cooling equipment can be obtained through testing by consuming power according to outside temperature.

In case of SOC, SOC is converted into energy by energy conversion table according to SOC according to battery temperature and compared with expected running energy. The values of the SOC to energy conversion table are stored in advance as they can be obtained through testing.

Accordingly, if the current SOC is compared with the calculated travel energy, if it is determined that the SOC is insufficient, a proposal step (S240) of suggesting the electric charging station as a light oil destination is performed.

If the user selects the electric charging station as the light passing destination, the downward step S320 of lowering the entry SOC to the CS mode to the lowest value is performed.

3 is a case where the SOC is in shortage and the electric charging station is selected as the diesel destination, and the SOC of the vehicle may drop to the normal value (30%) or less because the entry SOC is lowered to the lowest value. Then, before reaching the minimum value, the driver will go through the charging station, so that it is recharged, the SOC is increased, and only the EV can be operated to the driving destination.

Meanwhile, the comparison step S220 further includes a downward step S320 of lowering the entry SOC to the CS mode to a minimum value when the SOC is sufficient. That is, if the SOC is compared with the calculated SOC, it is possible to operate the vehicle only in the EV mode for a long time by decreasing the entry SOC to the minimum value. This can prevent the engine starting which does not match the user's intention.

FIG. 2 shows a case where the entry SOC is reduced to the minimum value when the SOC is sufficient or when the driver is in the forced EV mode. In this case, the vehicle is operated only in the EV mode up to the lowest value, and in the HEV mode when the SOC reaches the minimum value, Is maintained at the lowest value.

On the other hand, the downward step S320 further includes a maintenance step (S340) of keeping the entry SOC into the CS mode at the normal value when the electric charging station is not selected as the light oil destination. That is, FIG. 4 shows that the entry SOC is maintained at the normal value. In this case, the SOC is switched from the EV mode to the HEV mode at about 30%, and the SOC of the battery is activated with the engine. To keep the level constant.

The driving control method of the hybrid vehicle according to the present invention calculates driving energy required for EV traveling to a destination when navigation destination is designated on navigation and compares it with SOC, suggests an electric charging station as a light oil destination when SOC is short, And when the charging station is selected as the diesel destination, the entering SOC into the CS mode is reduced to the lowest value.

According to the running control method of the hybrid vehicle having the above-described structure, unnecessary start-up of the engine is prevented, thereby improving fuel economy and preserving the environment.

Also, by implementing the EV mode or the HEV mode in conjunction with the navigation destination of the user, it is possible to effectively comply with the intention of the driver and to compare the traveling energy, thereby ensuring the stability and efficiency of battery operation.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

S100: Identification step S200: Check step
S220: comparison step S240:
S320: Downward step

Claims (6)

A check step (S200) of checking whether or not the travel destination is specified;
A comparison step (S220) of calculating travel energy required for traveling the EV when the travel destination is designated, and comparing it with SOC;
A downward step S320 of lowering the entry SOC to the CS mode when the SOC is sufficient;
A suggestion step (S240) of suggesting an electric charging station as a light oil destination when the SOC is insufficient; And
And a downward step (S320) of lowering the entry SOC to the CS mode to the lowest value when the electric charging station is selected as the diesel destination. The method according to claim 1,
(S100) for confirming whether or not the EV enforcement mode is selected. The method of claim 2,
Further comprising: a step (S320) of lowering the entry SOC to the CS mode to the lowest value when the EV force mode is selected (S100). delete The method according to claim 1,
The downward step S320 further includes a maintenance step S340 of maintaining the entry SOC into the CS mode at the normal value when the electric charging station is not selected as the diesel destination . If the destination of travel is designated in the navigation, the travel energy required for EV travel to the destination is calculated and compared with the SOC. When the SOC is short, an electric charging station is proposed as a transit destination. When the electric charging station is selected as the transit destination, Wherein the control unit lowers the entry SOC to the minimum value and decreases the entry SOC to the CS mode to a minimum value when the SOC is sufficient.

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