KR101340475B1 - Method for controlling air conditioner of vehicle - Google Patents

Abstract

 According to the present invention, an engine cooling state of a vehicle is determined by dividing the vehicle leaving state by a value detected from an indoor temperature sensor and an outdoor temperature sensor provided in a vehicle without separately providing a sensor means for sensing the coolant temperature on the heater core side. After determining the difference, according to the vehicle's neglect state, by performing the differential heating start control, the control method of the vehicle air conditioner so that the cold wind is discharged to the driver or occupant to minimize the more cold feeling For the purpose of providing

In the control method of the vehicle air conditioner according to the present invention for achieving the above object, the indoor and outdoor for detecting the outdoor temperature and the indoor temperature detected by the outdoor temperature sensor and the indoor temperature sensor of the vehicle after the start of the vehicle is turned on A temperature detection step;

When the vehicle interior temperature corresponding to each of the vehicle interior temperatures detected at the time when the vehicle is turned on is within a predetermined range, the vehicle is classified as being partially left and the interior temperature is less than or equal to the temperature region of the partial parking state. An engine cooling state determining step of determining an engine cooling state by dividing the vehicle into a completely left state when it is within the range;

And performing an initial heating control step of differently setting the initial heating control driving time according to whether the vehicle is partially left or completely left.

Engine, cooling, status, heating, start up, control

Description

Method for controlling air conditioner of vehicle

The present invention relates to a control method of an automotive air conditioner, and more particularly, to detect from an indoor temperature sensor and an outdoor temperature sensor that are conventionally provided in a vehicle without separately providing a sensor means for sensing a coolant temperature on a heater core side. The engine cooling state of the vehicle is determined by dividing the vehicle idle state by the set value, and the initial heating start control differentially performed according to the vehicle idle state is performed to minimize the cold wind discharged to the driver or the occupant. It relates to a control method of the vehicle air conditioner to make the feel more.

In general, an air conditioner of a vehicle is a device that cools or heats a vehicle interior by introducing air from the exterior of a vehicle or inside a vehicle to heat or cool the air to blow into the interior of the vehicle. A flow path for inducing air is formed, and on this flow path, heat exchangers for heating or cooling the blower air and cold and warm air heated or cooled while passing through the heat exchangers are distributed to each part of the interior of the vehicle. Several doors are provided for guiding.

1 is a cross-sectional view schematically showing the internal structure of such an air conditioner for a vehicle. In particular, a semi-center comprising an air evaporator unit for cooling the air and a heater unit for heating in order to miniaturize the air conditioner. It shows the internal structure of the semi-center type air conditioner (1).

As shown in the drawing, the evaporator 3 in the inner flow path of the air conditioning case 2 is provided on the upstream side, and the heater core 4 is provided on the downstream side.

A blower case (not shown) is provided at the inlet end of the air conditioning case 1, and a blower fan (not shown) driven by a motor (not shown) is installed in the blower case.

An indoor air suction port (not shown) and an outdoor air suction port (not shown) are provided at the upper portion of the blower case, and these suction ports are opened and closed in accordance with the turning of the switch door (not shown).

Accordingly, the air is introduced into the blower case through the indoor air inlet or outdoor air inlet port by the suction force generated by the rotation of the blowing fan according to the driving of the motor, and blown into the internal flow passage of the air conditioner case 1, And / or the heater core 4, the air can be heat-exchanged to cool or warm.

In addition, a defrost vent connected to a defrost duct (not shown) for guiding air discharge toward the car window at the exit end of the air conditioning case 1 at the rear side of the heater core 4 to remove the defrost of the car window. (5), a face vent 6 connected to a vent duct (not shown) for guiding air discharge toward the upper half of the vehicle interior, and a floor duct (not shown) for guiding air discharge to the lower half of the vehicle interior Floor vents 7 are connected in turn.

In addition, the vents 5, 6, and 7 are controlled to be opened and closed in accordance with a predetermined cooling and heating mode by the doors 6a, 6a, and 7a, respectively.

On the other hand, the heater core 4 is provided so as to occupy the lower half of the cross-sectional area of the internal flow path of the air conditioner case 1 and is disposed in front of the heater core 4 (i.e., between the heater core 4 and the evaporator 3) Is provided with a temperature control door 8 for controlling the opening of the air passage 9 on the side of the heater core 4 and the inner flow path 10 of the air conditioning case 1 on the upper side of the heater core.

The air passing through the evaporator 3 bypasses the heater core 4 without passing through the heater core 4 when the temperature control door 8 blocks the air passage 9 on the side of the heater core 4 The ventilation of the vehicle interior can be performed by discharging the vented air through the open vents among the vents 5, 6, 7 to the vehicle interior.

When the temperature control door 8 closes the inner flow path 10 side of the air conditioning case 1 at the upper side of the heater core 4, all air passing through the evaporator 3 flows through the heater core 4 The ventilation of the vehicle interior can be performed by discharging the vented air through the open vents among the vents 5, 6, 7 to the vehicle interior.

In recent years, such an air conditioning apparatus has been developed from a manual type to a fully automatic type (Full Auto Temperature Control; FATC) in accordance with a trend that all systems of automobiles are automated and electronically. Devices continue to expand.

In general, a manual air conditioner manually controls a mode, air volume, and temperature by directly manipulating a control switch installed in the center of an instrument panel in a vehicle according to a driver's or passenger's degree of indoor temperature. On the contrary, if the air conditioner is set only to the room temperature required by the driver, the mode, air volume, etc. are automatically controlled by the programmed Micom according to external conditions. It can be operated more conveniently and safely without any operation.

The electric air conditioner includes an input signal such as a cooling water temperature sensor for sensing an inside temperature (indoor temperature), an outdoor temperature (outdoor temperature), an evaporator, a water temperature of a heater core, (Mod door motor, temp door motor, internal / external door motor) through logical operation from Micom to keep the room temperature at the set temperature of the driver.

In the current automatic temperature control method, the cold air flowing in from the outside during the engine warm-up is determined by determining the engine cooling state before starting by using the detection value of the coolant temperature sensor installed on the heater core side after the start-up in winter. Initial heating start control logic is also provided which can prevent discharge to the side.

However, when the cooling water temperature sensor breaks down, there is a problem that initial heating start control cannot be performed.

In addition, the coolant temperature sensor separately installed on the heater core side is used in a limited time during initial heating start control, and its use frequency is very low, and there is also an inefficient problem in terms of installation cost.

Therefore, instead of using the detection value of the coolant temperature sensor separately installed on the heater core side, the cooling water temperature sensor can be deleted while using the existing outside air temperature sensor, thereby applying a heating start control method for automobiles. An automatic temperature control method has been proposed in Korean Laid-Open Patent Publication No. 2001-110823.

Pre-applied automotive temperature control method, the step of detecting the outside air temperature using an outside air temperature sensor, determining whether the outside temperature is less than 5 ℃ and the temperature difference between the inside temperature and the outside temperature is less than 10 ℃, If the outside temperature is below 5 ℃ and the temperature difference between the outside temperature is below 10 ℃, auto setting the defroster in heater mode and setting the blower mode to low, and heating operation control after setting the heater mode and blower mode The time is determined by the temperature of the outside air, but if the outside temperature is -15 ℃ or less, the heating start control time is 8 minutes, -14.5 ℃ ~ -10 ℃ 6 minutes, -9.5 ℃ ~ -1 ℃ 4 minutes, -0.5 Determining to 2 minutes if the temperature is ℃ ~ -5 ℃, and comparing the internal temperature and the outdoor temperature if the temperature value of the internal temperature is greater than 10 ℃ comprises the step of releasing the heating operation control.

However, according to the above-described auto temperature control method for automobiles, there are the following problems.

This is simply controlling the initial heating start time and air volume only by the outside air temperature. Even though the coolant temperature is different according to the vehicle's standing level even at the same outside air temperature, the differential initial heating start control should be performed. Since the heater mode is defrosted and the blower mode is set when the temperature difference between the internal and external air when the temperature is equal to or lower than the predetermined value is set to the blower mode, the initial heating start control time is controlled to vary according to the external temperature. As the initial heating is started, the interior of the car cannot be comfortably created.

The present invention has been made to solve the above problems, the value detected from the indoor temperature sensor and the outdoor temperature sensor that is provided in the existing vehicle without a separate sensor means for sensing the coolant temperature on the heater core side After determining the engine cooling state of the vehicle by dividing the vehicle neglected state, and performing the initial heating start control that is differentiated according to the neglected state of the vehicle, the cold wind is discharged further to the driver or the passenger to minimize the cold The object of the present invention is to provide a control method of the vehicle air conditioner to make it feel.

In the control method of the vehicle air conditioner according to the present invention for achieving the above object, the indoor and outdoor for detecting the outdoor temperature and the indoor temperature input and detected by the outdoor temperature sensor and the indoor temperature sensor of the vehicle after the vehicle is started A temperature detection step; When the vehicle interior temperature corresponding to each of the vehicle interior temperatures detected at the time when the vehicle is turned on is within a predetermined range, the vehicle is classified as being partially left and the interior temperature is less than or equal to the temperature region of the partial parking state. An engine cooling state determining step of determining an engine cooling state by dividing the vehicle into a completely left state when it is within the range; And performing an initial heating control step of differently setting the initial heating control driving time according to whether the vehicle is partially left or completely left.

As described above, according to the present invention, without leaving a sensor means for sensing the coolant temperature on the heater core side, the vehicle is left unattended with the values detected from the indoor temperature sensor and the outdoor temperature sensor provided in the vehicle. After distinguishing the engine cooling state of the vehicle, the initial heating start control is differentiated according to the neglected state of the vehicle, so that the cold wind is discharged to the driver or the passenger to minimize the cold, so that the user can feel the cold more. Can be.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of a control method of a vehicle air conditioner according to the present invention will be described in detail.

Figure 2 is a flow chart for showing the control method of the present invention, Figure 3 is an experimental result graph that can know the engine cooling state according to the present invention.

Here, the outdoor temperature sensor and the indoor temperature sensor of the present invention, which will be described later, are embedded in a vehicle having a Full Auto Temperature Control (FATC) air conditioning apparatus, as mentioned in the background art description, and have a separate drawing or part number. Omission of references is omitted. In addition, the portion where the air is discharged during the defrost (Def) discharge mode operation of the present invention described later is the defrost vent (5) in Figure 1, the portion where the air is discharged during the Mix (Mix) discharge mode operation is shown in Figure 1 The defrost vent 5 and the floor vent 7 are also the parts where the air is discharged, and the part where the air is discharged during the floor discharge mode operation is the floor vent 7 in FIG. 1.

The temperature control method, which is a control method of the present invention, provides a control logic that can prevent cold air introduced from the outside at the time of warming up the engine in winter for the first time to be discharged toward the passenger's foot. As shown in FIG. 2, the control logic performs an indoor / outdoor temperature detection step of detecting the input outdoor temperature and the indoor temperature detected by the outdoor temperature sensor and the indoor temperature sensor of the vehicle after the vehicle is started. S5)

Next, when the vehicle interior temperature corresponding to each of the vehicle exterior temperatures detected at the time of starting the vehicle is within a predetermined range, the vehicle is classified as being partially left, and the interior temperature is the temperature range where the vehicle is partially left. If the vehicle is within the following range, the engine is cooled down and the engine cooling state is determined.

Thereafter, an initial heating control performing step is performed by differently setting the initial heating control driving time according to whether the vehicle is partially left or completely left.

Herein, when the vehicle is in a partially left state, it means a state that is about 1 hour, not a long time after the vehicle is turned off, wherein the interior temperature corresponding to each of the outside temperature detected at the time when the vehicle is started is measured. As shown in 3, it is when it is in the temperature range of the section between reference line a and leader line b.

In addition, when the vehicle is in a completely left state, it means a state that has elapsed for a long time after the vehicle is turned off, wherein the interior temperature corresponding to each of the exterior temperature detected at the time when the vehicle is started is shown in FIG. 3. , When the temperature is within a range below the baseline b.

Subsequently, the initial heating control performing step is performed by differently setting the initial heating control driving time according to the case where the vehicle is divided into the partially neglected state (S30) or when the vehicle is divided into the completely neglected state (S40). (S70)

Here, when the vehicle interior temperature range corresponding to each of the vehicle exterior temperatures detected at the time when the vehicle is started on in the engine cooling state determination step S10 is within the range of the temperature range of the partial neglected state, the vehicle is left unattended. When the vehicle is left unattended, it means a state in which the elapsed time from the start of the vehicle to the start of the vehicle is within a few minutes, and corresponds to each of the outside temperature detected at the time of starting of the vehicle. As shown in FIG. 3, the vehicle interior temperature is in a temperature range of a section above the reference line a.

Hereinafter, the reference lines a and b shown in FIG. 3 will be described in more detail.

When the outdoor temperature is in the range of minus 20 ° C. to image 15 ° C., when the outdoor temperature is minus 20 ° C., the indoor temperature is image 13 ° C., and when the outdoor temperature is image 15 ° C., the indoor temperature is image 17.5 ° C., image 13 ° C. The temperature change line connected in a straight line to the image 17.5 ° C is referred to as the reference line a.

When the indoor temperature is minus 2 ° C when the outdoor temperature is minus 20 ° C and the room temperature is minus 17.5 ° C when the outdoor temperature is minus 15 ° C, a temperature change line connected in a straight line from minus 2 ° C to 17.5 ° C Is called the baseline b.

Here, although the range of the outdoor temperature and the outdoor temperature shown in FIG. 3 is in the range of minus 20 ° C. to 15 ° C. and minus 20 ° C. to 20 ° C., the inclination of the reference lines a and b is changed, but the outdoor temperature is below zero. Although the slope change of the baseline a, b at a temperature lower than 20 ℃ is not shown in the figure, the outdoor temperature shows a trend such as the range of minus 20 ℃ ~ image 15 ℃.

In addition, in the temperature range where the outdoor temperature is higher than the image 15 ° C, since the initial heating control of the present invention is not necessary, the gradient change of the baselines a and b is not separately shown, and the initial heating control of the present invention is not performed. It turns out that

In more detail, as can be seen in the graph of FIG. 3, when the outdoor temperature is below 5 ° C., it can be seen that the room temperature is between 16 ° C. and 20 ° C. when the outdoor temperature is above the baseline a. Such a condition is that the coolant temperature is about 80 ° C when viewed from the actual vehicle. Since the initial heating start control is not necessary, the wind direction is set to the floor 7, and the voltage of the blower (not shown) is increased. General heating control is performed to increase and control the air volume by increasing the flow rate (S50).

When it is determined that the area is equal to or less than the reference line b (completely neglected area) and when it is determined that the area between the reference line a and the reference line b (partially neglected area) is determined, the engine is in an initial heating start control entry mode. By judging, as can be seen from the graph of FIG. 3, it can be divided into a complete neglect region and a partial neglect region.

In the case of the complete standing area, when the outdoor temperature is below 5 ° C, the area below the baseline b is when the room temperature ranges from 7 ° C to -5 ° C. Such a condition is that the temperature of the coolant is much lower than about 80 ° C. in the actual vehicle, which means that the vehicle is completely left outside for a long time.

In the case of the partial neglected area, when the outdoor temperature is below 5 ° C, the area (partial neglected area) between the reference line a and the reference line b is the case where the indoor temperature ranges from 7 ° C to 16 ° C. Such a condition is that in the actual vehicle, the coolant temperature is higher than that of the complete neglect and lower than that of the unattended vehicle, which means that the vehicle is left for about 1 hour after driving for a predetermined time.

On the other hand, in the present invention, it is preferable to control the temperature range region of the partially left state by setting the temperature range of the partial neglected state to increase as the outside temperature of the vehicle is decreased.

3 is a graph showing an optimized experimental result for knowing an unattended state of a vehicle in order to determine an engine cooling state. On the basis of the indoor and outdoor temperature data within the area range, initial heating start control or general heating control can be selectively performed according to the vehicle standing state, and in particular, cold wind is discharged to the driver during initial heating start control. It can be reduced to less cold to provide a comfortable air conditioning environment.

As described above, when it is determined that the cooling state of the engine is partially left and completely left (S30) (S40), the wind direction is sequentially changed to the defrost discharge mode, the mix discharge mode, and the floor discharge mode. The air volume is controlled by gradually increasing the voltage of the blower at the low stage. (S60) (S70).

In addition, when the cooling state of the engine is determined to be completely left and partially left, the present invention may vary the defrost discharge mode operation time according to the outdoor temperature, but the vehicle is less than the defrost discharge mode operation time when the vehicle is partially left. In this case, it is possible to control to further extend the defrost discharge mode operation time in the case where it is completely left (S60) (S70).

On the other hand, in the present invention, when the vehicle is partially left and when the vehicle is completely left, the operating time (t) according to the vehicle speed at the time of driving the vehicle is different from the defrost discharge mode operating time, but the vehicle is left unattended. In this case, it is possible to further extend the defrost discharge mode operation time when the vehicle is completely left than the defrost discharge mode operation time.

The operating time (t) according to the vehicle speed of the vehicle is

Calculated by

That is, the time it takes for the engine of the vehicle to be stopped and then restarted to rise to a normal temperature of approximately 80 ° C, depending on the type of vehicle and the performance of the vehicle, is referred to as T. Assume 4 minutes.

For example, when the vehicle is partially left, the operating time t becomes four minutes when the vehicle is operated for four minutes at a high vehicle speed of 40 km / h or more. In this case, the reference time for raising the coolant temperature by 80 ° C. (T ), The defrost discharge mode is performed for 4 minutes.

On the other hand, when the vehicle is completely left, the defrost discharge mode operation time is further extended than when the vehicle is partially left. For example, after the vehicle is operated for 2 minutes at a low vehicle speed of less than 40 km / h, If you drive for more than 40 km / h for two minutes, the operating time (t) is three minutes.

Therefore, since a minute is shorter than the reference time T required to increase the coolant temperature by 80 ° C, the reference time required to increase the coolant temperature by 80 ° C when the vehicle is partially left and the vehicle is completely left unattended ( The defrost discharge mode operation time when the vehicle is completely left than the defrost discharge mode operation time when the vehicle is partially left by subtracting the operating time t calculated according to the vehicle speed when driving the vehicle at T). Control to extend further.

As described above, even when the vehicle is driven for about two minutes at a high vehicle speed of 40 km / h or more and then two minutes at a low vehicle speed of 40 km / h, the defrost discharge mode operation time when the vehicle is partially left as described above. It is further controlled to compensate for the defrost discharge mode operation time when the vehicle is completely left.

That is, since the operating time (t) is three minutes, one minute is shorter than the reference time (T) required to increase the coolant temperature by 80 ° C, and thus, the vehicle at the reference time (T) required to increase the coolant temperature by 80 ° C. The defrost discharge mode operation time when the vehicle is completely left is further extended than the defrost discharge mode operation time when the vehicle is partially left by subtracting the operating time t calculated according to the vehicle speed during driving. To control.

The variable '1' applied at the high vehicle speed and the variable '0.5' applied at the low vehicle speed are not limited thereto, but the variable applied at the low vehicle speed is smaller than the variable applied at the high vehicle speed. Set to lose.

The reason for this is that when the vehicle speed is slow, the engine coolant temperature rises slowly, so the defrost discharge mode operation time is compensated for as slow as the vehicle speed is, but the vehicle is operated more than the defrost discharge mode operation time when the vehicle is partially left. In this case, the defrost discharge mode operation time is further extended.

Hereinafter, an embodiment to which the operating time for each engine cooling state is given in the embodiment applied to the vehicle speed variable of the present invention will be described with reference to Table 1 below.

[Table 1]

Outdoor temperature (℃)
Defrost discharge mode operation time (seconds) Mix Discharge Mode Operating Time (sec)
Partial neglect Completely neglected 15 30 60 30 10 40 75 30 5 50 90 30 0 60 120 30 -5 80 150 40 -10 100 180 50 -15 120 200 60 -20 140 200 60 -40 140 200 60

As can be seen from [Table 1], when the vehicle is left completely, the defrost discharge mode operation time is extended more than when the vehicle is partially left, so that the initial heating start control is performed when the vehicle is left completely. In addition, it is possible to provide a comfortable air-conditioning environment by reducing the cold wind discharged to the driver to a minimum and feeling less cold.

On the other hand, the present invention is carried out by changing the wind direction to the mixed discharge mode, and then changed to the floor discharge mode, the time when the floor discharge mode is carried out when the coolant temperature rises to approximately 80 ℃, from this point on General heating control will be performed.

1 is a cross-sectional view of a general automotive air conditioner.

2 is a flowchart illustrating a control method of the present invention.

Figure 3 is an experimental result graph that can know the engine cooling state according to the present invention.

Claims (4)

An indoor / outdoor temperature detection step of detecting an outdoor temperature and an indoor temperature detected by the outdoor temperature sensor and the indoor temperature sensor of the vehicle after the vehicle is started; When the vehicle interior temperature corresponding to each of the vehicle interior temperatures detected at the time when the vehicle is turned on is within a predetermined range, the vehicle is classified as being partially left and the interior temperature is less than or equal to the temperature region of the partial parking state. An engine cooling state determining step of determining an engine cooling state by dividing the vehicle into a completely left state when it is within the range; And performing an initial heating control step of differently setting the initial heating control driving time according to whether the vehicle is partially left or completely left. And the temperature region in the partially left state is set to increase as the outside temperature of the vehicle is decreased. delete The method of claim 1, When the vehicle is in the partially or completely unattended state, the wind direction is sequentially changed to the defrost discharge mode, the mix discharge mode, and the floor discharge mode, and the blower voltage is gradually increased at the low stage to control the air volume. Control method of a vehicle air conditioning apparatus, characterized in that. The method according to claim 1 or 3, The defrost discharge mode operation time is changed by calculating the operating time t according to the vehicle speed of the vehicle, and the defrost discharge mode operation time when the vehicle is completely left than the defrost discharge mode operation time when the vehicle is partially left. The control method of the automotive air conditioner, characterized in that for controlling to further extend the frost discharge mode operating time.

Images