KR-20260062112-A - EV LINE VARIABLE CONTROL SYSTEM AND METHOD FOR ELECTRIFIED VEHICLE

Abstract

The present invention aims to provide a variable EV line control system and method for a hybrid vehicle, which allows the EV line to be lowered to a certain level based on the total driving energy and the energy required for charging and discharging while the vehicle is driving a specific pre-set driving path, thereby enabling the battery SOC to be managed to a higher target battery SOC compared to the reference SOC before reaching the destination for using the stay mode.

Inventors

• 허지욱

Assignees

• 현대자동차주식회사
• 기아 주식회사

Dates

Publication Date

20260507

Application Date

20241025

Claims (20)

1. Input device for inputting whether to control EV line variability; A navigation device that provides information for EV line variable control, including traffic information to a destination for stay mode, current location information, and road gradient information, to a vehicle controller; and A vehicle controller configured to calculate the total driving energy required to reach a destination based on information for EV line variable control provided by the navigation device upon request for EV line variable control through the input device, calculate the energy required for charging and discharging based on the current battery SOC and a preset target battery SOC, and determine the EV line variable amount and the final EV line based on the total driving energy and the energy required for charging and discharging; EV line variable control system for an electrified vehicle characterized by including
2. In claim 1, An EV line variable control system for an electrified vehicle, characterized in that the vehicle controller is configured to determine that the distance to a destination for a stay mode input through the navigation device is an EV line variable control impossible distance if the distance is less than a reference distance, and determine that the distance is an EV line variable control possible distance if the distance is greater than or equal to the reference distance, and to output a message indicating the EV line variable control impossible distance to a display.
3. In claim 1, The above vehicle controller is, An EV line variable control system for an electrified vehicle, characterized by being configured to calculate vehicle air resistance, rolling resistance, climbing resistance, and acceleration resistance based on traffic information, current location information, and road gradient information provided by the navigation device, as well as average vehicle speed information and acceleration/deceleration information of the road to the destination, and predetermined vehicle weight and tire gradient information, and to calculate the total driving energy by integrating the calculated air resistance, rolling resistance, climbing resistance, and acceleration resistance.
4. In claim 1, The above vehicle controller is, An EV line variable control system for an electrified vehicle, characterized by being configured to determine the required SOC for charging and discharging by subtracting the target battery SOC from the reference SOC, and to determine the required energy for charging and discharging based on the determined required SOC and battery capacity.
5. In claim 4, EV line variable control system for an electrified vehicle, characterized in that the above-mentioned charge/discharge required energy is determined by multiplying the above-mentioned charge/discharge required SOC and battery capacity.
6. In claim 1, The above vehicle controller is, An EV line variable control system for an electrified vehicle, characterized by being configured to determine an EV line variable rate based on the total driving energy and charging/discharging required energy, determine an EV line variable amount based on the EV line variable rate, and determine a final EV line that is lowered to a certain level compared to the existing EV line based on the EV line variable amount.
7. In claim 6, An EV line variable control system for an electrified vehicle, characterized in that the above EV line variable rate is determined by the value obtained by dividing the above charging and discharging required energy by the total driving energy.
8. In claim 6, An EV line variable control system for an electrified vehicle, characterized in that the above EV line variable amount is determined by multiplying the existing EV line by the above EV line variable rate.
9. In claim 6, An EV line variable control system for an electrified vehicle, characterized in that the above-mentioned final EV line is determined at a level reduced by the EV line variable amount compared to the existing EV line.
10. In claim 1, An engine controller that performs engine on or off control based on the final EV line commanded by the vehicle controller; A power generation device that generates power by rotational force resulting from engine operation during engine ON control; and A battery controller that controls the charging of the generated power of the above-mentioned power generation device into a battery; EV line variable control system for an electrified vehicle, characterized by further including
11. A step of determining whether EV line variable control is possible in the vehicle controller when a request for EV line variable control is made through an input device; When the above EV line variable control is possible, a step of providing information for EV line variable control, including traffic information to a destination input through a navigation device, current location information, and road gradient information, to the vehicle controller; and Based on information for variable EV line control provided by the navigation device, the vehicle controller calculates the total driving energy required to reach the destination, calculates the energy required for charging and discharging based on the current battery SOC and a preset target battery SOC, and determines the variable EV line amount and the final EV line based on the total driving energy and the energy required for charging and discharging; A method for variable EV line control of an electrified vehicle characterized by including
12. In claim 11, In the step of determining whether variable control of the above EV line is possible, A method for controlling EV line variability in an electrified vehicle, characterized by determining that if the distance to a destination for a stay mode input through the navigation device is less than a reference distance, it is a distance at which EV line variability control is impossible, and if it is greater than or equal to the reference distance, it is a distance at which EV line variability control is possible, and outputting a message indicating the distance at which EV line variability control is impossible on a display.
13. In claim 11, The above total driving energy is, A method for variable EV line control of an electrified vehicle, characterized by calculating vehicle air resistance, rolling resistance, climbing resistance, and acceleration resistance based on traffic information, current location information, and road gradient information provided by the navigation device, as well as average vehicle speed information and acceleration/deceleration information of the road to the destination, and predetermined vehicle weight and tire gradient information, and integrating the calculated air resistance, rolling resistance, climbing resistance, and acceleration resistance.
14. In claim 11, The above required charging and discharging energy is, A variable control method for an EV line of an electrified vehicle, characterized by being determined based on the required charge/discharge SOC and battery capacity determined by subtracting the target battery SOC from the reference SOC.
15. In claim 14, A variable EV line control method for an electrified vehicle, characterized in that the energy required for charging and discharging is determined by multiplying the SOC required for charging and discharging by the battery capacity.
16. In claim 11, When determining the above EV line variable amount and final EV line, A method for controlling EV line variation in an electrified vehicle, characterized by first determining an EV line variation rate based on the total driving energy and charging/discharging required energy, determining an EV line variation amount based on the EV line variation rate, and then determining a final EV line that is adjusted downward to a certain level compared to the existing EV line based on the EV line variation amount.
17. In claim 16, A method for controlling EV line variability in an electrified vehicle, characterized in that the above EV line variability rate is determined by the value obtained by dividing the above charging and discharging required energy by the total driving energy.
18. In claim 16, A method for controlling EV line variation in an electrified vehicle, characterized in that the above EV line variation amount is determined by multiplying the existing EV line by the above EV line variation rate.
19. In claim 16, A method for controlling the variable EV line of an electrified vehicle, characterized in that the above-mentioned final EV line is determined at a level reduced by the variable amount of the above-mentioned EV line compared to the existing EV line.
20. In claim 11, A step in which engine on or off control is performed by an engine controller based on the final EV line commanded by the vehicle controller; A step in which power generation of a power generation device is achieved by rotational force resulting from engine operation during engine ON control; and A step in which the generated power of the above-mentioned power generation device is controlled to charge the battery by a battery controller; A variable EV line control method for an electrified vehicle characterized by further including

Description

EV Line Variable Control System and Method for Electric Vehicle The present invention relates to a variable EV line control system and method for an electric vehicle, and more specifically, to a variable EV line control system and method for an electric vehicle that enables variable control of an EV line based on total driving energy and energy required for charging and discharging within a specific driving path. As is well known, hybrid vehicles, a type of electrified vehicle, are equipped with both a motor and an engine, offering an EV (electric vehicle) mode that drives solely on motor power and an HEV (hybrid electric vehicle) mode that drives using both engine and motor power. In hybrid vehicles, the engine is turned on to switch to HEV mode while driving in EV mode, and turned off to switch back to EV mode while driving in HEV mode; therefore, efficient engine on/off control is required to improve fuel efficiency. To this end, an EV line is used for controlling the engine on or off of hybrid vehicles. The above EV line serves as a reference line for determining the engine on or off time, and includes EV Online, which determines the engine on time, and EV Offline, which determines the engine off time, and can be constructed with approximately tens of map data based on battery SOC (State Of Charge) and driver required power. Accordingly, the controller of the hybrid vehicle can determine the engine on or off time using the map data while driving, and perform engine on or off control according to the determined time. Meanwhile, research and development are underway to utilize vehicles not merely as a means of transportation, but as indoor living spaces for rest, sleeping, and hobbies. For example, a stay mode is being researched and developed that allows for various indoor and outdoor activities while continuously using battery power by enabling the motor to generate power using the rotational power from the engine idling while the hybrid vehicle is parked in a specific location to charge the battery. To use this stay mode, a method is required to manage the battery SOC to a level higher than the standard value during the drive immediately prior to the vehicle reaching the parking location. FIG. 1 is a power transmission system diagram of a high-lead vehicle to which EV line variable control according to the present invention is applied. FIG. 2 is a control configuration diagram illustrating an EV line variable control system of an electrified vehicle according to the present invention. FIG. 3 is a flowchart illustrating a variable EV line control method for an electrified vehicle according to the present invention. FIG. 4 is a graph illustrating a method for extracting a reference SOC for variable EV line control of an electrified vehicle according to the present invention. FIG. 5 is a graph illustrating an example in which the EV line is lowered compared to the existing one based on the method of the EV line variable control system of an electrified vehicle according to the present invention. The specific structural or functional descriptions described in the embodiments of this specification are merely illustrative for the purpose of explaining embodiments according to the concept of the present invention, and embodiments according to the concept of the present invention may be implemented in various forms. Furthermore, the invention should not be interpreted as being limited by the embodiments described in this specification, and should be understood to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. In this specification, terms such as "first" and/or "second" may be used to describe various components, but said components are not limited by said terms. For the sole purpose of distinguishing one component from other components, for example, without departing from the scope of rights according to the concept of the present invention, a first component may be named a second component, and similarly, a second component may be named a first component. Throughout this specification, the same reference numerals denote the same components. The terms used in this specification are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used in this specification, "comprises" and/or "comprising" do not exclude the presence or addition of one or more other components, steps, actions, and/or elements to the mentioned components, steps, actions, and/or elements. An electric vehicle to which the system and method of the present invention are applied may be a hybrid vehicle and a fuel cell vehicle equipped with a high-voltage battery, a self-generating power device that generates power using fuel, and a charging device for charging the battery with the power generated by the generating device. The power g