KR101601485B1 - Apparatus for controlling battery SOC of hybrid vehicle using driving circumstance and method for the same - Google Patents

Abstract

The present invention relates to a method and an apparatus for controlling battery charging of a hybrid vehicle considering driving circumstances. More specifically, the method of the present invention comprises the steps of: acquiring data of the difference between high parts and low parts on a path where a vehicle will drive; calculating the charging capacity of the battery according to the inclined driving on the acquired path; and controlling the regenerative braking quantity of the vehicle according to the calculated charging capacity of the battery. The step of calculating the charging capacity of the battery is to consider the remaining mileage of the vehicle on a downward path and to subtract the difference from the value of the charging capacity (ΔSOC) from the battery charging capacity (SOC_0) which is set.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery charging control method and apparatus for a hybrid vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method and an apparatus for controlling charge of a battery in a hybrid vehicle considering a traveling environment, and more particularly to a method of controlling a charge capacity of a battery by controlling a SOC (state of charge) And apparatus.

Recently, demand for environmentally friendly automobiles has been increasing due to the continuous improvement of automobile fuel efficiency and strengthening of emission regulations of each country. As a real alternative, hybrid electric vehicles are attracting attention.

A hybrid vehicle refers to a vehicle driven by two power sources, and a high voltage battery is used as an energy storage device of a hybrid vehicle.

The hybrid vehicle includes an engine and a motor as direct drive sources, and includes a clutch and a transmission for power transmission, an inverter for driving the engine and the motor, a high-voltage battery, and the like. (HCU), a motor control unit (MCU), and a battery management system (BMS), which are communicably connected to each other.

As described above, there is a problem in that unnecessary regenerative braking is performed when the state of charge (SOC) of the hybrid vehicle battery including the motor as a power source is sufficient at the same time as the internal combustion engine. Further, when the vehicle is running on a flat surface or when traveling uphill, the vehicle requires more driving force than a vehicle running on a downhill slope. Therefore, there is a need to control the size of the battery charging capacity according to a slope. Further, a simple control method is required through the remaining distance traveled to the steel plate, not the control depending on the back plate and the steel plate on the above route.

As a conventional technique, Japanese Laid-Open Patent Application No. 2007-0126145 (hereinafter referred to as Document 1) discloses a technique for controlling a battery charging capacity. However, there is a disadvantage in that the battery charging capacity is controlled using a separate set value depending on the backing plate and the steel plate in the path, and the battery charging capacity is controlled when the vehicle is traveling through complicated logic. That is, there is a problem that the battery charging capacity control step is complicated.

SUMMARY OF THE INVENTION The present invention provides a method and apparatus for controlling a battery charging capacity by measuring a remaining traveling distance to a steel plate on a traveling path of a vehicle, The battery charging capacity is controlled so that the charging capacity of the battery is controlled in order to provide the optimum driving state when the vehicle is driven by switching to the motor driving force by the difference value of the battery charging capacity at the step of running on the back plate and the flat plate It has its purpose.

Obtaining a downhill travel remaining distance on the entire route that the vehicle wishes to travel; Calculating a charge capacity difference value (? SOC) from an amount of energy change according to a downhill travel remaining distance on the route and a speed of the vehicle; Determining a real charge capacity (SOC _ref ) by subtracting the calculated charge capacity difference value (? SOC) from a previously set battery charge capacity (SOC ₀ ). to provide.

Further, the charging capacity difference value (? SOC)

(S=내리막 주행 잔여거리, Vm=차량의 평균속도, P=회생제동파워) 에 의해 연산되는 것을 특징으로 하는 주행환경을 고려한 하이브리드 차량의 배터리 충전 제어방법을 제공한다.

(S = a downhill running remaining distance, Vm = average speed of the vehicle, and P = regenerative braking power). The battery charging control method of the hybrid vehicle takes into account the traveling environment.

Also, in the step of acquiring the downhill traveling remaining distance on the entire route that the vehicle wishes to travel, the vehicle receives the destination information to which the vehicle wants to arrive, receives GPS (Global Positioning System) information, ; And determining a downhill travel distance of the vehicle based on the current position information of the vehicle and the destination information.

Further, the present invention provides a battery charge control apparatus for a hybrid vehicle that takes into account a traveling environment, the battery charge control apparatus comprising: a sensor unit for measuring running data and battery data of the vehicle; A navigation unit for setting a route of the vehicle and calculating a downhill travel remaining distance on the set route; A battery unit in which charging is performed through regenerative braking; (SOC ₀ ), calculates a charging capacity difference value (? SOC) in consideration of the amount of energy change due to the downhill traveling distance of the vehicle and the speed of the vehicle, And a control unit for calculating a required actual charge capacity SOC _ref according to the running environment of the hybrid vehicle.

In addition, the navigation unit receives the destination information to which the vehicle wants to arrive, receives current position information of the vehicle on the basis of GPS (Global Positioning System) information, and displays the current position information of the vehicle based on the current position information and the destination information And determines a downhill traveling distance of the vehicle in the traveling section. The apparatus for controlling the battery charging of a hybrid vehicle according to claim 1, further comprising:

In addition,

(S=내리막 주행 잔여거리, Vm=차량의 평균속도, P=회생제동파워)에 의해 상기 충전용량 차이값(ΔSOC)을 연산하는 것을 특징으로 하는 주행환경을 고려한 하이브리드 차량의 배터리 충전 장치를 제공한다.

(? SOC) is calculated by the following equation (S = remaining distance for running downhill, Vm = average speed of vehicle, P = regenerative braking power) do.

The control unit may include a Hybrid Control Unit (HCU), a Motor Control Unit (MCU), and a Battery Management System (BMS). Device.

According to the present invention, it is possible to control the charging capacity of the battery by considering only the downhill travel remaining distance from the current position to the arrival point on the travel route without distinguishing the uphill section and the downhill section on the entire route. It is possible to control the charging capacity of the battery through a simple information processing process in which the inclination is calculated or the geographic information processing process according to each location is not required.

Further, as described above, by changing the fixed battery charging capacity, it is possible to minimize fuel consumption in a situation where a sufficient amount of regenerative braking amount is predicted, and to maximize the use of the battery to further improve the running fuel economy of the vehicle can do.

Fig. 1 shows a block diagram of a battery charge control apparatus for a hybrid vehicle in consideration of a traveling environment.
Fig. 2 shows a change in the actual charge capacity SOC _ref value when passing through a path having a high level difference, according to an embodiment of the present invention.
Fig. 3 shows a flowchart of a battery charging control method of a hybrid vehicle in consideration of a traveling environment.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The present invention provides a method and an apparatus for controlling a battery charging capacity (SOC) of a hybrid vehicle by calculating a remaining traveling distance on a steel plate and controlling the charging method. As a result, fuel consumption can be minimized in a situation where a sufficient amount of regenerative braking is predicted, thereby further improving fuel economy.

FIG. 1 is a block diagram of a battery charge control apparatus 100 of a hybrid vehicle in consideration of a traveling environment according to an embodiment of the present invention.

As shown in FIG. 1, in the case of the battery charging control apparatus 100 of a hybrid vehicle considering a traveling environment, a sensor unit 110 for measuring traveling data and battery data of the vehicle, A navigation unit 120 for calculating a downhill traveling distance on the route, a battery unit 130 for charging through regenerative braking, and a predetermined battery charging capacity SOC ₀ , A control unit 140 for calculating a charging capacity difference value? SOC in consideration of the relationship with the regenerative braking power according to the remaining distance and calculating a value of the actual filling capacity SOC _ref necessary for the traveling stage according to the difference in height of the route . The actual charge capacity SOC _ref required for the actual driving phase is calculated by subtracting the charge capacity difference value? SOC from the previously set battery charge capacity SOC ₀ .

The average speed of the sensor unit 110, the average regenerative braking amount, the voltage of the battery, the battery capacity data, and the like. The navigation unit 120 includes a GPS (Global Positioning System) for setting a destination of the vehicle and determining the current position of the vehicle. The navigation unit 120 controls the navigation unit 120, The distance data can be calculated.

Based on the measured data value, the controller 140 calculates the position and kinetic energy change and the charging efficiency of the battery, based on the energy recovery rate due to the regenerative braking and the rate of change in energy due to the downhill traveling distance on the path. Further, the controller 140 calculates the charge capacity difference value? SOC through the measured value.

The battery unit 130 is controlled by a control unit to charge the battery, and serves as a power source for generating driving force of the motor through discharge of the battery unit. However, in the case of the battery unit, in the case of regenerative braking travel of the hybrid vehicle, the battery charge capacity (SOC) is set by the bar controller 140 capable of charging the battery.

The controller 140 may include a central processing unit (CPU), a hybrid control unit (HCU), a motor control unit (MCU), and a battery management system (BMS) The motor controller can control driving force generation and regenerative braking performance of the motor, and the battery controller can control the battery charging capacity value. In the case of the hybrid controller, the battery charging capacity (SOC) of the high voltage battery is continuously monitored and the charge discharge of the battery is controlled. Further, the control unit stores the previously set battery charge capacity (SOC ₀ ), calculates the charge capacity difference value (ΔSOC) in consideration of the energy change amount corresponding to the downhill travel remaining distance of the vehicle, And controls charging and discharging of the battery according to a required battery charging capacity (SOC).

In addition, the control unit 140 calculates a change amount of a kinetic energy according to a predicted value of an average vehicle speed along a route, based on a change amount of the position energy according to a difference between a starting point and a destination point on the entire path of the vehicle, Further, the control unit 140 can store the regenerative braking power value and the energy recovery rate obtained through the regenerative braking, and calculate the charging capacity difference value (ΔSOC) through calculation with the calculated values. That is, the control unit 140 receives the measurement value measured by the sensor unit 110 and calculates the charge capacity difference value? SOC based on the received measurement value. In this regard, the charge capacity difference value calculated by the controller 140 is determined by the following equation.

[Equation 1]

&Quot; (2) "

In the case of Equation (1), the downward travel remaining distance S (m) is calculated by the navigation unit, divided by the vehicle average speed Vm (m / s) And multiplied by the regenerative braking power P (w) to calculate the amount of energy change. In the case of the average regenerative braking power P, it means a set value stored in the control unit through the running of the vehicle. Further, the average speed of the vehicle means a predicted value of the average speed during traveling of the vehicle, which is expressed through the route data.

The charging capacity difference value calculated according to the downhill traveling remaining distance on the moving route of the vehicle is calculated as the battery charging capacity (SOC ₀ ) preset in the controller, The actual charge capacity SOC _ref required for the actual running phase is subtracted from the charge capacity difference value.

Further, in the case of (Equation 2) for calculating the charging capacity difference value? SOC, the charging capacity difference value can be calculated by calculating the downhill traveling remaining distance S in the above equation (1) to the current speed Vi of the vehicle.

As described above, the control unit 140 calculates the actual charge capacity SOC _ref required for the actual driving step, which is obtained by subtracting the calculated charge capacity difference value (SOC) from the previously set battery charge capacity (SOC ₀ ) .

FIG. 2 shows the actual charge capacity SOC _ref according to the traveling route.

2, when the vehicle moves up the slope, the actual charge capacity SOC _ref value is smaller than the previously set battery charge capacity SOC ₀ as the running step with the back plate, In order to switch the difference between the battery charge capacity SOC ₀ and the actual charge capacity SOC _ref , which is set by lowering the actual charge capacity SOC _ref at the running stage of the inclination, to the driving force of the motor.

When the vehicle travels on a downward slope, the initial charge capacity SOC _ref is smaller than the previously set battery charge capacity SOC ₀ , but the downhill travel remaining distance The actual charge capacity SOC _ref is reset to the preset value of the battery charge capacity SOC ₀ and when the downhill travel remaining distance is 0, the battery charge capacity SOC ₀ and the actual charge capacity SOC ₀ , (SOC _ref ) are controlled to have the same value.

3 is a flowchart showing a battery charge control method of a hybrid vehicle in consideration of a traveling environment.

The navigation unit 120 acquires the high level difference data on the traveling route (S201) to measure the downhill traveling distance. Thereafter, a charging capacity difference value (ΔSOC) is calculated according to the amount of energy change in the traveling stage of the vehicle through the measured downhill travel remaining distance, and the required actual charging capacity (SOC _ref ) is calculated (S202).

The calculation of the actual charge capacity is calculated by subtracting the charge capacity difference value (? SOC) from the predetermined battery charge capacity (SOC ₀ ). (S203) of controlling charging and discharging of the battery in accordance with the actual charge capacity SOC _ref .

The charging capacity difference value? SOC includes calculating a charging capacity of the battery through an energy change amount according to a downhill traveling distance on the route, a vehicle speed, an average regenerative braking amount, and a measured value of the battery. That is, according to one embodiment, the charging capacity difference value? SOC is calculated by the above Equations (1) to (4).

The embodiments of the battery charging control method and method of the hybrid vehicle taking into account the traveling environment are described as embodiments of the present invention. However, the scope of the technical idea of the present invention is not limited by the embodiments disclosed in the present invention, The method of calculating the energy change amount, the method of calculating the difference in charge capacity value (? SOC), and the method of calculating the actual charge capacity (SOC _ref ) should be interpreted as having a protection range for the same range and the same range.

100: Battery charging control device of hybrid vehicle considering traveling environment
110:
120: Navigation section
130: Battery section
140:

Claims (7)

Obtaining a downhill travel remaining distance on the entire route that the vehicle wishes to travel;
Calculating a charge capacity difference value (? SOC) from an amount of energy change according to a downhill travel remaining distance on the route and a speed of the vehicle;
And determining an actual charge capacity (SOC _ref ) by subtracting the calculated charge capacity difference value (? SOC) from a previously set battery charge capacity (SOC ₀ ).
The method according to claim 1,
The charging capacity difference value (? SOC)

(S = remaining distance for downhill travel, Vm = average speed of vehicle, P = regenerative braking power)
The battery voltage of the hybrid vehicle is calculated by the following equation.
The method according to claim 1,
In the step of obtaining the downhill travel remaining distance on the entire route the vehicle is intended to travel,
Receiving destination information on which the vehicle desires to arrive and obtaining current position information of the vehicle by receiving GPS (Global Positioning System) information;
And determining a downhill traveling distance of the vehicle based on the current position information of the vehicle and the destination information.
1. A battery charge control apparatus for a hybrid vehicle,
A sensor unit for measuring running data and battery data of the vehicle;
A navigation unit for setting a route of the vehicle and calculating a downhill travel remaining distance on the set route;
A battery unit in which charging is performed through regenerative braking; And
(SOC ₀ ), calculates a charging capacity difference value (ΔSOC) in consideration of the amount of energy change according to the downhill traveling distance of the vehicle and the speed of the vehicle, And a control unit for calculating a required actual charge capacity (SOC _ref ) based on the running state of the battery.
5. The method of claim 4,
The navigation unit receives the destination information to which the vehicle desires to arrive, receives current position information of the vehicle based on GPS (Global Positioning System) information, and displays the current position information of the vehicle on the basis of the current position information of the vehicle and the destination information. Determining a running section in which the vehicle travels, and determining a downhill running distance of the vehicle in the running section.
5. The method of claim 4,
Wherein,

(S = remaining distance for downhill travel, Vm = average speed of vehicle, P = regenerative braking power)
Wherein the charging capacity difference value calculation unit calculates the charging capacity difference value (? SOC) by using the charging capacity difference value (? SOC).
5. The method of claim 4,
Wherein the control unit includes a Hybrid Control Unit (HCU), a Motor Control Unit (MCU), and a Battery Management System (BMS) .

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