JPH01229712A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To contrive the improvement of comfortableness compensating a temperature change of suction air by detecting the actual temperature of air, sucked to an air conditioning unit, and correcting an air mixing door for its opening in accordance with this detection value. CONSTITUTION:An air conditioner for a vehicle respectively provides an air conditioning unit 1 having an air mixing door 28 adjusting a temperature of air blown into a car room and a control means 57 controlling an opening of the air mixing door 28 being based on a function value calculated by an environmental condition inside and outside the car room. In this constitution, a suction air temperature detecting means 58, which detects a temperature of suction air to the air conditioning unit 1, is provided. And a correcting means 59, which corrects an opening of the air mixing door 28 in accordance with a detection value of the suction air temperature detecting means 58, is provided. In this way, the opening of the air mixing door 28 is adjusted so as to compensate a change of the suction air temperature, even when it changes, to the air conditioning unit 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air conditioner installed in a vehicle, and particularly to an auto air conditioner that automatically adjusts the temperature inside the vehicle to a comfortable temperature. The present invention relates to measures to compensate for the decrease in comfort caused by switching the intake air between inside and outside air.

(Prior Art) This type of auto air conditioner has been widely known to the general public. For example, as shown in Japanese Patent Application Laid-Open No. 61-44015, an air conditioning unit is equipped with an air conditioner that adjusts the temperature of the air blown into the passenger compartment. A mixed door is installed to control the room temperature inside the vehicle,
The temperature of the air blown into the vehicle interior from the air conditioning unit is controlled by controlling the opening degree of the air mix door based on the function value calculated from the environmental conditions inside and outside the vehicle interior, such as outside air temperature, solar radiation, and target temperature. The temperature is automatically adjusted to a set comfortable temperature.

(Problem to be Solved by the Invention) By the way, in the above-mentioned air conditioner, when the air conditioner is heated, the humidity of the air inside the vehicle is high, and when the high humidity air is circulated, fogging occurs on the windshield. , an outside air introduction mode is adopted in which outside air, which is drier than the air inside the vehicle, is introduced into the air conditioning unit. On the other hand, during cooling, a circulation mode is adopted in which internal air is sucked into the air conditioning unit and blown back into the vehicle interior in order to increase cooling efficiency.

However, in addition to cases in which the air introduction mode is automatically selected in response to switching between air conditioning and heating, there are situations in which the intake air is switched between inside and outside air through manual operation by the occupant. For example, when operating in the outside air introduction mode during heating, if there is an unpleasant odor in the outside air, the system is temporarily switched to the circulation mode.

In that case, the air introduced into the air conditioning unit is switched from cold outside air to warm outside air, so with the previously set opening degree of the air mix door, the air blowing temperature will temporarily rise from the comfortable temperature, resulting in , there was a problem in which passengers felt uncomfortable.

Therefore, an object of the present invention is to prevent the air from blowing out from the air conditioning unit even if the intake air is manually switched between inside and outside air during operation in auto mode that automatically controls the opening degree of the air mix door. The purpose of the automatic air conditioner is to suppress changes in air temperature, eliminate the resulting discomfort for passengers, and maintain the auto air conditioner's original function of maintaining the indoor temperature at a comfortable temperature.

(Means for Solving the Problem) In order to achieve this object, the present invention detects the temperature of the air actually taken into the air conditioning unit, and adjusts the opening degree of the air mix door based on the intake air temperature. Make corrections from the set values.

That is, as shown in FIG. 1, the present invention includes an air conditioning unit 1 having an air mix door 28 that adjusts the temperature of air blown into the vehicle interior, and the above-mentioned air conditioning unit 1 having an air mix door 28 that adjusts the temperature of air blown into the vehicle interior, and The premise is that the vehicle air conditioner is equipped with a control means 57 that controls the opening degree of the air mix door 28.

In this air conditioner, there is an intake air temperature detection means 58 for detecting the temperature of the intake air to the air conditioning unit 1, and an intake air temperature detection means 58 for detecting the temperature of the intake air to the air conditioning unit 1, and a
A correction means 59 for correcting the opening degree of 8 is provided.

(Function) With the above configuration, in the present invention, the control means 57 calculates a function value based on the environmental conditions inside and outside the vehicle, such as room temperature, outside temperature, solar radiation, and target temperature, and based on this function value, the air conditioning unit The opening degree of the first air mix door 28 is controlled.

On the other hand, the actual temperature of the air taken into the air conditioning unit 1 is detected by the intake air temperature detection means 58, and the opening degree of the air mix door 28 is corrected by the correction means 59 according to this detected value. Since the actual intake air temperature is detected in this way, even when the air intake into the air conditioning unit 1 is switched from inside air to outside air or from outside air to inside air and the intake air temperature changes temporarily, Accordingly, the opening degree of the air mix door 28 is adjusted to compensate for changes in the intake air temperature, that is, when the intake air temperature decreases, the outlet temperature is increased, and conversely, when the intake air temperature increases, the outlet temperature is lowered. is adjusted to Therefore, regardless of whether the intake air is switched between inside and outside air, air at a comfortable temperature is always blown out from the air conditioning unit 1, so that the occupants do not feel uncomfortable and can improve comfort.

(Example) Hereinafter, an example of the present invention will be described based on the drawings from FIG. 2 onwards.

FIG. 2 shows the overall configuration of a vehicle air conditioner according to an embodiment of the present invention, in which 1 is an air conditioning unit composed of blower, cooler, and heater units 2, 10, and 17; A blower 5 driven by a blower motor 4 is provided inside the case 3. Further, the cooler unit 10 has a case 11 connected to the case 3 of the blower unit 2, and an evaporator 1 is disposed in the case 11.
2 (evaporator) is installed. This evaporator 12
is an expansion valve (not shown), a compressor 13 (compressor) drivingly connected to an on-vehicle engine 35 via an electromagnetic clutch 13a, a receiver tank 14, and a condenser 15 (condenser) connected in series via a refrigerant pipe 16. The refrigerant is circulated between these devices 12 to 15, the refrigerant compressed by the compressor 13 is condensed and liquefied in the condenser 15, the liquid refrigerant is expanded in the expansion valve, and then vaporized in the evaporator 12. The heat of vaporization cools the air.

Furthermore, the heater unit 17 is connected to the cooler unit 10.
The heater core has a case 18 connected to the case 11, and one heater core is installed inside the case 18. This one heater core is connected to the engine 3 through a cooling water pipe 20.
The heater core 19 is connected to a water jacket (not shown) of the engine 35, and heats the intake air by supplying coolant whose temperature has increased from the engine 35 to the heater core 19 and radiating heat there.

The case 3 of the blower unit 2 is formed with an outside air introduction port 6 that communicates with the outside of the vehicle, and an inside air introduction lower that communicates with the interior of the vehicle. An inside/outside air switching door 8 which selectively switches and introduces outside air or inside air is rotatably supported, and the door 8 is switched and driven by an inside/outside air switching motor 9.

Further, the case 18 of the heater unit 17 is provided with vent and differential communication ports 21, 22 and a heat outlet 23, and the heat outlet 23 is opened toward the feet of the occupant. On the other hand, the upstream end of a vent duct 24 is connected to the vent communication port 21, and the downstream end of the duct 24 has seven vent outlets 25, 25. ... is formed.

The upstream end of a differential duct 26 is connected to the differential communication port 22, and the downstream end of the duct 26 has four differential air outlets 27, 27.
... is formed.

Furthermore, the case 18 of the heater unit 17 has an air mix door 2 that adjusts the temperature of the air blown into the vehicle interior.
8 and an auxiliary door 29 are rotatably supported, and both doors 28 and 29 are drivingly connected to a mix door motor 30 to control the opening degree of the air mix door 28, that is, the flow path area with respect to the heater core 19. It is designed to adjust the temperature of the blowing air.

The case 18 of the heater unit 17 also includes a vent door 31 for opening and closing the vent communication port 21, a differential door 32 for opening and closing the differential communication port 22, and a heat outlet 23.
A heat door 33 that opens and closes is rotatably supported, and these three doors 31 to 33 are drivingly connected to a mode door motor 34, which drives each door 31 to 33.
The opening and closing of the valve is controlled in a predetermined pattern to switch the blowout mode. And motor 9°30.
By switching and controlling the opening and closing of doors 8, 28, 29, 31 to 33 by means of 34, the inside air or outside air sucked into the blower unit 2 is cooled and heated by the cooler unit 10 and the heater unit 17, respectively, and then blown into the vehicle interior. The system is designed to harmonize the air inside the vehicle to a comfortable condition.

In the figure, 36 indicates the three central vent outlets 25.
25. . . . The swing louver 37 is a swing louver motor for driving the swing louver. 38 is a radiator placed immediately after the capacitor 15;
9 is a fan driven by the engine 35, and 40 is a fan system.

The above blower motor 4, each door 8, 28, 29°31~3
The motors 9, 30, 34, swing louver motor 37, and electromagnetic clutch 13a that drive the opening and closing of the swing louver motor 37 are configured to be operated and controlled by a control unit 50 containing a CPU. The control unit 50 includes information such as the temperature of the air blown into the vehicle interior, the amount of air blown out (air volume),
Operating device 5 for commanding air conditioning conditions such as blowing direction
1 are connected so that signals can be exchanged, and the output signals of the sensor group are input. That is, the operating device 51 includes an auto mode setting section 51a that switches the operating mode of the air conditioner to auto mode, a manual mode switching section 51b that selectively switches the air conditioner to each mode of vent, pie level, and heat, and an air conditioner. an intake mode switching section 51c that switches the air intake mode to the unit 1 to a circulation mode (RFC mode) or an outside air introduction mode;
A temperature setting section 51d that sets a target temperature in the vehicle interior, and an air volume setting section 51 that sets the air volume (output air volume) of the blower 5.
e, and a display section 51f that displays the operating mode of the air conditioner.

On the other hand, the sensor group includes a room temperature sensor 52 (inside air sensor) that detects the temperature tr (room temperature) inside the vehicle compartment 2, an outside air sensor 53 that is disposed at the front end of the engine room of the vehicle and detects the outside air temperature ta, A solar radiation sensor 54 arranged on the instrument panel detects the amount of solar radiation, a water temperature sensor 55 detects the temperature of the cooling water in the heater core 19, and an air mix door 28. 29, and a potentiometer 56 for detecting the actual opening degree.

The CPU of the control unit 50 executes signal processing according to the control flow shown in FIG. That is, in step S1 after the start,
Determine whether circulation mode (RFC mode) is selected as the current operating mode. If YES is determined here, the process proceeds to step S2, where the blower suction temperature t flowing into the evaporator 12 is set as room temperature t'' (t-tr
) Proceed to step S4. Moreover, when the judgment is NO,
The process proceeds to step S3, where the blower suction temperature t is set to the outside air temperature tr (t-ta), and then the process proceeds to step S4. In this step S4, it is determined whether or not the air conditioner is set to ON, in which the cooler unit 10 operates, and when the determination is No, the process proceeds to step S5, where the evaporator 1
After setting the temperature te of step 2 to the blower suction temperature t, select YES.
In this case, the process proceeds to step S6, where the evaporator temperature te is set to 0''C, and then the process proceeds to step S7.

In this step S7, the difference Δ1-1-te between the blower suction temperature t and the evaporator temperature te is calculated, and in the next step S8, the heater inlet air temperature immediately after passing through the evaporator 12 is determined as the intake air temperature in the present invention. 1. Calculate. This heater inlet air temperature t1 is the temperature difference Δt
is multiplied by the heat transfer coefficient K of the evaporator 12 to find the temperature change K・Δt due to passage of the evaporator 12, and the above-mentioned blower suction temperature t is added to this value (t
, -K・Δ1+1). To summarize the above, the heater inlet air temperature t1 is as shown in the table below.

Next, in step S9, the environmental conditions inside and outside the vehicle,
That is, the function value is determined based on the outside air temperature tB detected by the outside air sensor 53, the room temperature tr detected by the room temperature sensor 52, the amount of solar radiation detected by the solar radiation sensor 54, and the target room temperature set by the temperature setting section 51d of the operating device 51. Calculate the heater outlet air temperature tz (required blowout temperature) as . Further, in step SIO, the opening degree of the air mix door 28 is set based on the heater outlet air temperature tz (function value) and the heater inlet air temperature t1, and then the process ends. The opening degree of the air mix door 28 was set in advance as shown in FIG. Based on the characteristics of the heater outlet air temperature t2 and the opening degree of the air mix door 28, the door opening degree is determined by comparing the heater outlet air temperature t2 with the characteristics. It is set according to a change in the range of 0 to 20@C.

Therefore, in this embodiment, step S in the above flow
9.8IO basically constitutes a control means 57 that controls the opening degree of the air mix door 28 based on the heater outlet air temperature t2 (function value) calculated from the environmental conditions inside and outside the vehicle interior. has been done.

Further, steps 81 to S8 constitute an intake temperature detection means 58 that detects the intake air temperature to the air conditioning unit 1, that is, the heater inlet air temperature t1.

Further, in step 5lll, the temperature detecting means 58
A correction means 59 is configured to correct the opening degree of the air mix door 28 in accordance with the detected value, that is, the heater inlet air temperature t1.

Therefore, in the above embodiment, the heater outlet air temperature t2 is calculated in the control means 57 based on the room temperature tr, the outside air temperature ta, the amount of El radiation, and the target temperature, that is, the environmental conditions inside and outside the vehicle interior, and the heater outlet air temperature t2 is calculated according to the air temperature t2. The basic opening degree of the air mix door 28 in the heater unit 17 is set.

Further, the actual temperature t1 of the air sucked into the heater unit 17 is detected by the suction temperature detection means 58. That is, in the circulation mode in which inside air is taken in, the calculation is calculated as t+-(k+1)tr during cooling, and t and -tr during non-cooling. In addition, in the outside air introduction mode that introduces outside air, during cooling, t + -
(k+1)ta, and in non-cooling mode, t and -ta, respectively.

Then, this detected value t] is compared with the characteristics shown in FIG. The operation of the mix door motor 30 is controlled. For example, as shown in FIG. 4, the heater outlet air temperature t
2 is constant, the intake air temperature t1 varies from 0°C to 20°C.
The door opening degree is corrected smaller as the value increases.

Therefore, even when the air taken into the air conditioning unit 1 is switched from inside air to outside air or from outside air to inside air by manual operation by a passenger, and the heater inlet air temperature t1 changes temporarily, the In such a way that the opening degree of the air mix door 28 compensates for the change in the intake temperature, that is, when the heater inlet air temperature t1 decreases, the air flow rate to the heater core 19 is increased by increasing the opening degree to increase the blowout temperature, and vice versa. When the heater inlet air temperature t1 rises, the air flow rate to the heater core 19 is reduced by decreasing the opening degree, and the blowout temperature is adjusted to be lower.

As a result, air at a comfortable temperature can always be blown from the air conditioning unit 1 regardless of whether the intake air is switched between inside and outside air, so that the occupants do not feel uncomfortable and the comfort can be improved.

(Effects of the Invention) As described above, the present invention provides an automatic air conditioner type vehicle air conditioner that controls the opening degree of the air mix door of the air conditioning unit based on a function value calculated based on the environmental conditions inside and outside the vehicle. By detecting the actual temperature of the air drawn into the air conditioning unit and correcting the opening degree of the air mix door according to this detected value, even when the temperature of the air drawn into the air conditioning unit changes, , the opening degree of the air mix door can be adjusted to compensate for the temperature change. Therefore, regardless of the switching of the air intake route, air at a comfortable temperature can always be blown out from the air conditioning unit.
It is possible to improve comfort by eliminating the discomfort felt by the occupants.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention. Figure 2 and the following drawings show embodiments of the present invention; Figure 2 is a schematic sectional view showing the overall configuration of an air conditioner; Figure 3 is a flowchart showing the control flow; Figure 4 is a flow chart showing the opening of the air mix door. It is a characteristic diagram for setting the degree. 1...Air conditioning unit, 2...Prower unit, 8.
...Inside/outside air switching door, 10...Cooler unit, 1
7... Heater unit, 19... Heater core, 28
... air mix door, 50 ... control unit, 52 ... inside air sensor, 53 ... outside air sensor,
54... Solar radiation sensor, 57... Control means, 58...
・Intake air temperature detection means, 59...correction means, ta・
...Outside air temperature, tr...Room temperature, tl...Heater inlet air temperature (intake air temperature), t2...Heater outlet air temperature.

Claims (1)

[Claims] (1) An air conditioning unit having an air mix door that adjusts the temperature of air blown into the vehicle interior, and a control means that controls the opening degree of the air mix door based on a function value calculated based on environmental conditions inside and outside the vehicle interior. The vehicle air conditioner is provided with an intake air temperature detection means for detecting the temperature of intake air to the air conditioning unit, and a correction means for correcting the opening degree of the air mix door according to the detected value of the detection means. A vehicle air conditioner characterized by: