WO2012086911A1

WO2012086911A1 - Method for controlling air conditioning of electric car

Info

Publication number: WO2012086911A1
Application number: PCT/KR2011/008054
Authority: WO
Inventors: 조동호; 서인수; 이흥열; 이준호; 박미현
Original assignee: 한국과학기술원
Priority date: 2010-12-22
Filing date: 2011-10-27
Publication date: 2012-06-28
Also published as: KR101194778B1; KR20120071088A

Abstract

The present invention relates to a method for controlling the air conditioning of an electric car, and more specifically, to a method for controlling the air conditioning system to maintain the room temperature within an appropriate range even when the SOC of a battery is reduced. The present invention controls the room temperature to prevent rapid increase thereof in case the air conditioning system turns off unintentionally due to lack of electric power in the electric car, thereby preventing the passenger from being exposed to excessive heat change, and thus stably enhancing the comfort of the car ride.

Description

Air Conditioning Control Method of Electric Vehicle

The present invention relates to an air conditioning control method for an electric vehicle, and more particularly, to a method for controlling the air conditioning system to maintain the room temperature in an appropriate range even when the battery SOC is reduced.

The air-conditioning system of electric vehicles is only a facility that is not directly related to driving, and thus has a lower power supply priority than driving essentials. Accordingly, the air conditioning system of the electric vehicle cannot receive enough power when the power supply margin of the battery is low, and sometimes it cannot receive the power supply at all, so that the passengers are exposed to excessive heat change and degrade the riding comfort. There was this.

The present invention was devised to solve such a problem, and by controlling the cabin temperature not to increase suddenly even if the air conditioning system OFF due to the lack of power energy of the electric vehicle, so as not to expose passengers to excessive heat changes The aim is to reliably improve the riding comfort.

In order to achieve the above object, according to the present invention, the air-conditioning control method of the plug-in electric vehicle driven by the battery charged by the plug-in method, (a) the difference between the preset proper room temperature and the current room temperature has a certain range; Checking a state of charge (SOC) of the battery and driving the air conditioner when the deviation is greater than or equal to a preset driving reference value; (b) Revolutions per minute (RPM) of the compressor in the air conditioner using the energy stored in the battery in order to accumulate air conditioning energy in the air conditioner in advance when the SOC falls below a predetermined energy reserve accumulation reference value. Increasing; (c) stopping the operation of the air conditioner when the SOC falls below the driving reference value; And (d) operating the evaporator fan when the indoor temperature of the electric vehicle is out of an appropriate range, and discharging the air cooled or warmed by the heating and cooling energy accumulated in the step (b) to the room. It includes.

After the step (a), it may further comprise the step of increasing the RPM of the compressor by using the instantaneous regenerative braking energy generated in the motor.

The compressor RPM increase can be achieved by increasing the mass flow rate of the refrigerants.

According to another aspect of the present invention, the air conditioning control method of an on-line electric vehicle driven by collecting electric power in a self-induction method from a power supply device embedded in the road, (a) the difference between the preset room temperature and the current room temperature Checking a state of charge (SOC) of the battery when the predetermined range is out of a predetermined range, and driving the air conditioner when the predetermined reference value is equal to or greater than a preset driving reference value; (b) Revolutions per minute (RPM) of the compressor in the air conditioner using the energy stored in the battery in order to accumulate air conditioning energy in the air conditioner in advance when the SOC falls below a predetermined energy reserve accumulation reference value. Increasing; (c) When the current collecting energy collected from the power feeding device is equal to or greater than a predetermined value, in order to accumulate air conditioning energy in the air conditioning device in advance, RPM (revolutions per minute) of the compressor in the air conditioning device is used by using the current collecting energy. Increasing; (d) stopping the operation of the air conditioner when the SOC falls below the driving reference value; And (e) operating the evaporator fan when the indoor temperature of the electric vehicle is out of an appropriate range, thereby cooling the air cooled or warmed by the heating and cooling energy accumulated in the steps (b) and (c). Sending to the room.

According to the present invention, the cabin temperature is controlled so as not to increase suddenly even when the air conditioner system is unintentionally turned off due to the lack of power energy of the electric vehicle, thereby preventing passengers from being exposed to excessive heat changes, thereby improving the riding comfort stably. have.

1 is a view showing the configuration of a power control system of an online electric vehicle.

2 is a view showing the configuration of a power control system of a plug-in electric vehicle.

3 is a view showing the configuration of an electric vehicle air conditioner according to the present invention.

Figure 4 is a flow chart showing the air conditioning control method of the electric vehicle air conditioner according to the present invention.

5 is a view showing the room temperature and SOC graph according to the simulation of the electric vehicle air conditioning control method according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

FIG. 1 is a diagram illustrating a configuration of a power control system of an online electric vehicle 100, and FIG. 2 is a diagram illustrating a configuration of a power control system of a plug-in electric vehicle 100.

An online electric vehicle refers to an electric vehicle that is charged by a non-contact magnetic induction method, and a plug-in electric vehicle refers to an electric vehicle that is charged by inserting a charging wire into the electric vehicle by a plug-in method.

Referring to the drawings, the online electric vehicle 100 of FIG. 1 is connected to the power supply device 200 and is supplied with power in a non-contact magnetic induction manner from a current flowing in a feed line 210 buried close to the ground. That is, the magnetic field 211 is generated from the current flowing in the feed line 210, from the magnetic field 211, the current collector 150 installed in the on-line electric vehicle 100 collects electric power to be charged in the battery 110. .

In the plug-in electric vehicle 100 of FIG. 2, the charging line 220 connected to the power supply device 200 is directly plugged in to the battery 110 of the electric vehicle 100 to perform charging.

The other structure is the same as the on-line electric vehicle 100 of FIG. 1 and the plug-in electric vehicle 100 of FIG. 2, and in the following description with reference to FIGS. 1 and 2, the on-line electric vehicle 100 and FIG. The plug-in electric vehicle 100 is collectively referred to as an 'electric vehicle' (100).

The energy storage device 110 includes a super capacitor or a battery. A super capacitor is a component that is designed to be used for the purpose of a battery, with an emphasis on the performance of a capacitor, especially an electric capacity. It is a part that collects power and releases it as needed. It operates stably even after a long time in an environment where charge and discharge are repeated. It is usually used for charging power supplied from AC power and for supplying small power when the power is cut off. It is used for safety devices that temporarily supply power to the setting memory or operate during power failure.

The air conditioning apparatus 120 is installed in the electric vehicle 100 and operates using the energy storage device 110 as a power source, and is a device that is responsible for cooling, heating, and ventilation of the electric vehicle interior. The configuration thereof will be described later with reference to FIG. 3, and the air conditioning control method will be described later with reference to FIG. 4.

The power controller 130 is responsible for controlling the flow of power of the electric vehicle. The total available power amount is calculated from the capacity of the energy storage device 110, and the power distribution plan to the traveling motor unit 140 and the air conditioner 120 is determined therefrom. In the case of an online electric vehicle, the power collected by the current collector 150 in a magnetic induction manner is taken into account in addition to the capacity of the energy storage device 110 when calculating the total available power amount. In the case of an online electric vehicle, the charging speed of the battery while driving is also determined from the calculated total available power.

The driving motor unit 140 includes a driving motor and a driving motor controller. The traveling motor is a motor driven while driving an electric vehicle. The driving motor controller controls the speed of the driving motor and may be controlled by a feedback control. In the case of an online electric vehicle, power is collected by the current collector 150 in a magnetic induction manner from a power supply device embedded in a road surface, and the collected power is transferred to a driving motor, a battery, a super capacitor, and the like.

The power consumption of the driving motor is proportional to the power demand for driving, and as an example, may be represented by Equations 1 and 2 below.

Equation 1

Equation 2

Where Pn is the input power to the motor, Pm is the output power from the motor, Fd is the driving resistance force, V is the speed,

Power transmission efficiency,

Means motor efficiency.

In Equation 2, Fd may be calculated by Equation 3.

Equation 3

Here, Frol means rolling resistance from ground friction, Fair means air resistance, accelerating resistance, and Faoc means grad-ability resistnace.

3 is a view showing the configuration of an electric vehicle air conditioner 120 according to the present invention.

In the case of this figure, the structure for cooling is shown.

The air conditioning controller 121 plays a role of controlling a process of air conditioning control of the air conditioning apparatus. Such a control process will be described later with reference to the flowchart of FIG. 4.

Compressor 122 is responsible for compressing the refrigerant into a gas of high temperature, high pressure to send to the condenser (123). The condenser 123 converts the high temperature and high pressure gas refrigerant that has passed through the compressor 122 into a cold cooled liquid refrigerant. An expansion valve 124 lowers the pressure and temperature of the refrigerant to facilitate the heat absorption of the refrigerant liquid from the condenser and evaporates the refrigerant liquid. It controls the flow rate. The evaporator 125 absorbs heat from the surroundings of the low pressure and low temperature liquid refrigerant exiting the expansion valve 124 so as to be a low pressure and high temperature gas refrigerant. At this time, since the vaporization occurs by the absorbed heat, the surrounding air temperature suddenly drops. An evaporator fan 126 allows the air thus flowed down into the interior of the electric vehicle.

4 is a flowchart illustrating a method for controlling air conditioning of the electric vehicle air conditioner 120 according to the present invention.

The air conditioning control process described below is controlled by the air conditioning control unit 121 of the air conditioning apparatus 120.

The difference between the preset proper room temperature and the current indoor temperature is calculated (S401) to determine whether the difference is out of a predetermined range (S402). In case of departure, the air conditioner 120 is driven when the state of charge (SOC) of the battery is checked (S403) or more than the preset driving reference value (S404). In the embodiment of Fig. 5, the driving reference value of this SOC is 40%.

The SOC continues to decrease due to the operation of the electric vehicle and the operation of the air conditioner 120. When the SOC falls below a reference value for starting the preliminary energy reserve accumulation (S406), the cooling and heating energy in the air conditioner 120 is applied. In order to accumulate in advance, the revolutions per minute (RPM) of the compressor 122 in the air conditioner 120 is increased using the energy stored in the battery 110 (S407). RPM control of the compressor 122 is achieved by controlling the mass flow rate of the refrigerants. By increasing the RPM in this way, cold air, ie cooling energy, is rapidly accumulated in the air conditioning apparatus through the refrigerant.

The compressor outlet pressure and the mass flow rate of refrigerants can be represented by equations (4) and (5), respectively.

Equation 4

Equation 5

Where P ₃ is the compressor inlet pressure, P ₄ is the compressor outlet pressure, n is the polytropic index, η _m is the motor efficiency, η _e is the mechanical efficiency, W Is the power supplied to the compressor, m is the mass flow rate of refrigerants, v3 is the specific volume, V _st is the saturated volume of the comprossor, ρ _g is the refrigerant density ( refrigerants density, η _v is the volumetric efficiency, f is the compressor RPM.

In addition, in the case of an online electric vehicle capable of collecting current and charging the battery by a self-induction method from a power supply device embedded in a road surface while driving, the energy accumulation process is not only the power charged in the battery 110, but also the current collector in some cases. It may be made directly by the energy accumulated in the 150 (S408). That is, when the current collecting energy collected from the power feeding device is greater than or equal to a predetermined value, the battery 110 is charged by the current collecting energy, and at the same time, regardless of the battery SOC, the compressor in the air conditioner 120 uses the current collecting energy. By increasing the revolutions per minute (RPM) of 122, it is possible to accumulate air conditioning energy in the air conditioner 120 in advance.

In addition, the instantaneous regenerative braking energy generated by the motor may be directly used to increase the compressor RPM (S409).

Thereafter, when the SOC falls below the driving reference value, the operation of the air conditioner is stopped (S410). Accordingly, when the indoor temperature of the electric vehicle is out of an appropriate range value, by operating the evaporator fan (S411), by sending the air that is cold or warmed by the heating and cooling energy accumulated in the room to the room temperature suddenly Changes can be prevented.

5 is a diagram illustrating a room temperature 510 and a battery state of charge (520) graph according to a simulation of the electric vehicle air conditioning control method according to the present invention.

In particular, this drawing is a simulation diagram of an online electric vehicle capable of collecting current and charging a battery in a self-induction manner from a power feeding device embedded in a road surface while driving. Referring to the drawings, after the first charging section 521 is passed while driving the electric vehicle, the battery SOC is continuously reduced by the driving of the electric vehicle and the operation of the air conditioner in the non-charging section 522. In electric vehicles, the priority distribution of electric power is the driving of the vehicle, and the air conditioning unit is pushed backwards, so that the air conditioner is stopped when the SOC decreases. This figure shows an example in which the SOC reference value for stopping the operation of the air conditioner is set at 40%. When the battery SOC reaches 40%, that is, after 1000 sec in the figure, the air conditioner is turned off. Afterwards, the indoor temperature of the electric vehicle is rapidly increased due to external temperature (511). In this case, the passenger feels very uncomfortable due to the high temperature.

Application of the electric vehicle air conditioning control method of the present invention increases the RPM (revolutions per minute) of the air conditioner compressor just before reaching the SOC reference value of 40% to stop the operation of the air conditioner, that is, a certain time up to 1000 sec in the figure. . This is done by increasing the mass flow rate of the refrigerants. From this, cold air, that is, cooling energy, is rapidly accumulated in the air conditioning apparatus through the refrigerant. In addition, the rotational speed of the evaporator fan can be reduced to prevent the temperature change rapidly. After the SOC reference value of 40% is reached, the air conditioner is turned off. In this case, in order to prevent a sudden increase in the indoor temperature (511), the rotation speed of the evaporator fan (evaporator fan) is increased again to introduce the cooling energy accumulated previously into the room. In this way, regardless of the air conditioner Off, the room temperature does not change significantly (512) it is possible to maintain a comfortable room. In addition, by accumulating cooling and heating energy by properly adjusting the RPM of the compressor as described above, it is possible to comfortably maintain the room temperature at an appropriate level without frequently performing ON / OFF of the air conditioner.

Claims

The air conditioning control method of a plug-in electric vehicle driven by a plug-in charged battery,

(a) checking a state of charge (SOC) of the battery when the difference between the preset proper room temperature and the current room temperature is outside the predetermined range, and driving the air conditioner when the preset driving reference value is greater than or equal to the preset driving reference value;

(b) Revolutions per minute (RPM) of the compressor in the air conditioner using the energy stored in the battery in order to accumulate air conditioning energy in the air conditioner in advance when the SOC falls below a predetermined energy reserve accumulation reference value. Increasing;

(c) stopping the operation of the air conditioner when the SOC falls below the driving reference value; And

(d) operating the evaporator fan when the indoor temperature of the electric vehicle is out of an appropriate range, and discharging the air cooled or warmed by the heating and cooling energy accumulated in the step (b) to the room;

Air conditioning control method of the plug-in electric vehicle comprising a.
The method according to claim 1,

After step (a),

Increasing the RPM of the compressor by using the instantaneous regenerative braking energy generated by the motor

Air conditioning control method of the plug-in electric vehicle further comprising a.
The method according to claim 1,

The compressor RPM increase,

By increasing the mass flow rate of the refrigerants

Air conditioning control method for a plug-in electric vehicle characterized in that.
An air conditioning control method for an online electric vehicle driven by collecting electric power in a magnetic induction method from a power supply device embedded in a road,

(a) checking a state of charge (SOC) of the battery when the difference between the preset proper room temperature and the current room temperature is outside the predetermined range, and driving the air conditioner when the preset driving reference value is greater than or equal to the preset driving reference value;

(b) Revolutions per minute (RPM) of the compressor in the air conditioner using the energy stored in the battery in order to accumulate air conditioning energy in the air conditioner in advance when the SOC falls below a predetermined energy reserve accumulation reference value. Increasing;

(c) When the current collecting energy collected from the power feeding device is equal to or greater than a predetermined value, in order to accumulate air conditioning energy in the air conditioning device in advance, RPM (revolutions per minute) of the compressor in the air conditioning device is used by using the current collecting energy. Increasing;

(d) stopping the operation of the air conditioner when the SOC falls below the driving reference value; And

(e) If the indoor temperature of the electric vehicle is out of an appropriate range value, the evaporator fan is operated so that the air cooled or warmed up by the heating and cooling energy accumulated in the above steps (b) and (c) is indoors. Send to

Air conditioning control method of an online electric vehicle comprising a.
The method according to claim 4,

After step (a),

Increasing the RPM of the compressor by using the instantaneous regenerative braking energy generated by the motor

Air conditioning control method for an online electric vehicle further comprising a.
The method according to claim 4,

The compressor RPM increase,

By increasing the mass flow rate of the refrigerants

Air conditioning control method for an online electric vehicle, characterized in that.