JPH03231020A - Air conditioning control device for automobile - Google Patents

Abstract

PURPOSE:To provide a comfortable air conditioning state through the increase of an air temperature and relaxation of lowering of temperature in atmosphere around a head part by displacing an intake door from the FRESH side to the REC side during a compressor OFF-mode wherein an open air temperature is low. CONSTITUTION:The discharge temperature of an evaporator is detected by a means 100. It is detected by a means 200 whether a cold air bypass door is opened. Further, the OFF-mode of a compressor is detected by a means 300. Meanwhile, when the cold air bypass door is opened and a compressor is in an OFF-mode, the discharge target temperature of the discharge temperature of the evaporator is computed by a means 400. A displacement amount of an intake door 5 is computed by a means 500 so that the discharge temperature of the evaporator is adjusted to a value approximately equal to a target temperature, and according to the computed displacement position, the intake door 5 is driven by a means 600. A displacement amount and the control opening of the intake door are regulated by a means 700 so that an open air introduction amount is maintained at a given value.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air conditioning control device for an automobile that adjusts the temperature of air flowing through a cold air bypass passage by controlling an intake door.

(Prior Art) Conventionally, it has been known that a cold air bypass unit is used in an automotive air conditioning control system to control (cool) the temperature of an occupant's head, especially when there is sunlight.

For example, in Japanese Utility Model Publication No. 53-25350, the outlet of the cold air bypass unit is installed separately from the vent outlet of the main air conditioning duct and the foot outlet, for example, facing the head of the passenger, and other outlets It is disclosed that the air-conditioning feeling can be improved by arbitrarily applying cold air to the head of the occupant independently from the vehicle.

Furthermore, as a method that does not use the cold air bypass unit, Japanese Patent Laid-Open No. 58-335'09 discloses a method in which the ventilation duct is partitioned into at least two parts downstream of the air conditioning duct, and each duct is provided with an air mix door. It is disclosed that the conditioned air blown out from the two ventilation ducts is supplied to different air conditioning zones in the vehicle interior.

(Problem to be Solved by the Invention) However, in the conventional example using the above cold air bypass unit, when the outside air temperature becomes low, for example, below O'C, the temperature of the air flowing through the cold air bypass passage becomes too low. The problem was that the air was blown directly onto the occupants' heads, making them feel too cold. Also,
In a system that mixes the air flowing through the cold air bypass passage with the air in the main air conditioning duct and blows it out of the vent outlet, the vent outlet temperature drops more than necessary, and the vent outlet temperature cannot be adjusted to the target value based on the overall signal. The disadvantage was that it could not be controlled.

In addition, in the conventional method that does not use the cold air bypass unit described above, although it is possible to control the desired head cooling feeling, the structure of the heater unit and control device become complicated, making the entire device larger. There was a problem in that the cost increased as a result.

Therefore, this invention solves the above-mentioned conventional problems,
An object of the present invention is to provide an air conditioning control device for an automobile that is capable of controlling the temperature of air flowing through a cold air bypass passage so as to obtain an appropriate head cooling area even when the outside air temperature drops below a predetermined temperature. .

(Means for Solving the Problems) The gist of the present invention is, firstly, as shown in FIG. an inside air population 3 and an outside air population 4 provided in the vehicle, an intake door 5 that selectively opens and closes the inside air population 3 or the outside air population 4, and a cold air bypass passage 20 that blows cold air in the air conditioning passage to the upper body of the occupant. A cold air bypass door 21 that controls the opening and closing of this cold air bypass passage 20, an evaporator blowout temperature detection means 100 that detects the evaporator blowout temperature, and a cold air bypass door control instruction that determines whether or not the cold air bypass door 21 is opened. a determining means 200, a compressor off mode detecting means 300 for detecting a compressor off mode, an evaporator blowing target temperature calculating means 400 for calculating an evaporator blowing target temperature when the cold air bypass door is opened and the compressor is in the off mode, and the evaporator blowing target temperature calculating means 400 The intake door 5 is closed so that the blowout temperature approaches the evaporator blowout target temperature.
The intake door displacement calculating means 500 calculates the displacement of the intake door 5 and outputs the calculated displacement to the intake door driving means 600 for moving the intake door 5.

Second, in addition to the invention of claim 1, there is provided a control opening regulating means 700 for limiting the amount of intake door displacement calculated by the intake door displacement amount calculating means 500 so as to maintain at least a predetermined amount of outside air introduced. There is a particular thing.

(Function) Therefore, when the compressor off mode is detected by the compressor off mode determining means 300 and the occupant's head feels hot due to sunlight at low temperatures, the cold air bypass door 21 is opened. This state is determined by the cold air bypass door control instruction determining means 200.

When this happens, the amount of displacement (opening degree) of the intake door 5 is adjusted so that the evaporator blowout temperature detected by the evaporator blowout temperature detection means 100 becomes the evaporator blowout target temperature calculated by the evaporator blowout target temperature calculation means 400. is calculated by the intake door displacement amount calculating means 500, and is output to the intake door driving means 600 to move the intake door 5. As a result, the amount of outside air introduced is reduced to a predetermined amount of inside air circulation, and the temperature of the air flowing through the cold air bypass passage can be adjusted.

By adding the control opening regulating means, at least the minimum amount of outside air introduced is maintained without completely circulating inside air, and fogging on the windshield surface is prevented.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, the automotive air conditioning control device includes an air conditioning passage 1.
An intake door switching device 2 is provided on the most upstream side of the intake door. The air introduced into the air conditioning passageway 1 can be selected between inside air and outside air.

The blower 7 sucks air into the air conditioning passage 1 and blows it downstream, and an evaporator 8 and a heater core 9 are provided behind the blower 7.

The evaporator 8 is connected to a condenser (not shown) and the like through piping to form a cooling cycle, and cools the air sucked into the air conditioning passage 1. Further, cooling water from an engine (not shown) is circulated through the heater core 9 to heat the air. An air mix door 10 is provided in front of this heater core 9, and the opening degree θX of this air mix door 100 is controlled by an actuator 11.
By adjusting this, the amount of air passing through the heater core 9 and the amount of air bypassing the heater core 9 can be changed, and as a result, the temperature of the blown air can be controlled.

The opening degree θX of the air mix door 10 is 0% when the air mix door 10 is in the full cool position (1 position).
, is 100% at the full heat position (■ position).

The downstream end of the air conditioning passage 1 is divided into a defrost outlet 12, a vent outlet 13, and a heat outlet 14, which open into the vehicle compartment 15.
6, 17 and 18 are provided, and this mode door 16, 17
．． By operating 18 with an actuator 19, a desired blowing motor can be obtained.

Further, this device is provided with a cold air bypass passage 20 that bypasses a part of the air conditioning passage 1.

The cold air bypass passage 20 has one end connected downstream of the evaporator 8 of the air conditioning passage 1 and upstream of the air mix door IO, and the other end connected to the front of the upper outlet 13. A part of the air that has passed through can be directly supplied to the upper air outlet 13.

The amount of cold air supplied through the cold air bypass passage 20 can be adjusted by controlling the opening degree θy of the cold air bypass door 21 using an actuator 22. Note that the opening degree θy of the cold air bypass door 21 is controlled as described later.

Reference numeral 25 denotes a vehicle interior temperature detector for detecting the representative temperature Tr in the vehicle interior, and is attached to an instrument disc or the like. Further, 26 is a head temperature detector that is attached to the ceiling of the automobile and detects the temperature Trh around the head, 27 is an outside temperature detector that detects the outside temperature Ta, and 28 is a solar radiation detector that detects the amount of solar radiation Ts. 29 is an evaporator blowout temperature sensor that is installed at the evaporator 8 or immediately after the evaporator 8 and detects the air cooling capacity of the evaporator 8 as the temperature of the evaporator 8 or the temperature of the air that has passed through the evaporator 8, and these output signals are The signal is selected via a multiplexer (MPX) 31, converted into a digital signal via an A/D converter 32, and input to a microcomputer 33.

Further, 34 is an opening detector that detects the opening degree θy of the bypass door 21, 35 is a position detector that detects the position of the mode door 16, 1718, and 36 is an opening detector that detects the opening degree θX of the air mix door 10. These output signals are also input to a microcomputer 33 via a multiplexer 31 and an A/D converter 32, respectively.

Furthermore, output signals from the control panel 37, temperature setting device 38, and head temperature setting device 39 are input to the microcomputer 33.

The control panel 37 controls the blowout mode, VENT mode, Bl-L mode', HEAT mode, DEF/HE.
Mode switches 40a to 40e are manually set to AT mode and DEF mode, A/C switch 41 is used to operate the cooling cycle, and the rotation speed of the blower 7 is set to low speed (F
AN1), medium speed (FAN2), high speed (FAN3)
fan switches 42a, 42b and 42c, an AUTO switch 43 that automatically controls all air conditioning equipment such as blowers, an OFF switch 44 that stops the air conditioning equipment, and an OFF switch 44 that changes the position of the intake door 5 between FRESH (outside air intake) and RFC (internal air circulation). ).

The temperature setting device 38 is an up/down switch 45a45b
and a display section 46 that displays the set temperature Tset, and the set temperature Tset shown on the display section 46 can be changed within a predetermined range by operating up/down switches 45a and 45b. Further, the head temperature setting device 39 includes, for example, a dial-type knob 39a, and the head temperature setting device 39 can set the head temperature Th5et within a predetermined range set in advance.
can now be changed. Note that the temperature setting device 38 and the head temperature setting device 39 may be of a type in which a template lever is slid.

The microcomputer 33 includes a central processing unit (CPU) (not shown), a read-only memory (RO1'l), a random access memory (RAM), and a human output port (Il'l).
o), etc., and the actuators 6.11. ．． 19
, 22, and a drive circuit 48a to the motor of the blower 7, respectively.
48e to output a control signal to each door 5, 10, 1.
6.17.1821 drive control and motor rotation control.

Next, an example of the control operation of the microcomputer 33 will be explained.

FIG. 3 shows a flowchart of the main routine of the automotive air conditioning control system of the present invention. Ste.
Control is started from the temperature setting device 3, and in step 52, the control panel 37 outputs a setting operation signal and the temperature setting device 3.
A setting signal input process of inputting a setting signal etc. by 8 to the microcomputer 33, and a heat load detection signal, that is,
Outside air temperature detector 27, vehicle interior temperature detector 25, head temperature detector 26, solar radiation detector 28, Eva blowout temperature sensor 29
Each detection signal Ta, Tr, Trh, Ts, etc.
A detection signal input process is performed to input Te to the microcomputer 33, and the process proceeds to step 56.

In step 56, a total signal T corresponding to the heat load inside the vehicle is generated using the signals input in steps 52 and 54 described above.
, is calculated according to equation (1).

T+=ni+(Tr 25)+Kz(Tad 25)
10, Tsc K4 (Td 25) + C++Cz・
...(1) However, in K1-, 4 is a calculation coefficient, and C2 is a calculation constant.

Further, Tad is the outside air temperature Ta detected by the outside air temperature sensor 27 subjected to predetermined signal delay processing, and Tsc is the solar radiation 1jl T s detected by the solar radiation detector 28 subjected to predetermined signal processing. , a detailed explanation will be omitted here.

Furthermore, C5 is determined by the following (2) 2.

C8=to, (0-Tad) 00. (
2) However, this is applied only when Tad is 0°C or less, and when it is greater than 0°C, C+=O. Here, Ks is a calculation coefficient.

In addition, a comprehensive signal T2 for air mix door opening control, which is obtained by adding the evaporator outlet temperature Te as a control factor to this comprehensive signal T1, is calculated using the following equation (3), and furthermore, the opening degree control of the cold air bypass door is calculated. head general signal T that performs
3 is calculated using equation (4).

Tz=T, +Ks(Te-5) ・-・
(3) However, K5 is a calculation coefficient.

T3=Kb・Tsc'Kt (Thset 25)
...(4) However, K6. To? is the calculation coefficient, Ts
c is the signal representing the amount of solar radiation processed above, and Th
5et is the head set temperature. After this calculation, the process proceeds to step 58.

In step 58, T and the signal used as the determination value for switching the blowout mode are calculated by the following (5) 2.

T F −T e = K e ・θXt
...(5) However, Te is the evaporator blowing temperature, K8 is the calculation coefficient, and θxt is the target opening degree of the air mink store. After performing this calculation, the process proceeds to step 60.

In step 60, based on the calculation result of the total signal T, as shown in FIG.
Proceed to Pro 2.

In step 62, as shown in FIG. 5, based on the calculation result of the total signal T2 for air mix door opening control,
The air mix door 10 is controlled, step 63
Proceed to.

In Step 3, the blowout mode is switched as shown in FIG. 6 based on the TF multiplied signal of the judgment value for switching the blowout mode, and the process proceeds to Step Nob 64.

In step 64, the cold air bypass door 21 and the evaporator outlet temperature are controlled by the head comprehensive signal T3 as shown in FIG. 8, and the process proceeds to step 66.

In step 66, the intake door 5 is controlled as in the subroutine shown in FIG.

In Figure 8, 1. A flowchart of an intake door control routine including a control example of adjusting the temperature of air flowing through the cold air bypass passage by operating the intake door 5 when the outside air temperature is low is shown. Control is started from a start step 100, and in step 102, the outside air temperature sensor 2
7. Detection signals such as the evaporator outlet temperature sensor 29 and the opening degree detector 36 of the air mix door 10 and the control panel 3
A signal input process for inputting the operation setting signal No. 7 to the microcomputer 33 is performed. Next step 104
Now, turn on the AUTO switch 43 on the control panel 37.
It is determined whether or not is pressed. If YES (pressed), the process advances to step 106; if No (not pressed), the process advances to step 108.

Here, first, the processing after step 108 will be described, in which the intake switch 45 is manually operated when the AUTO switch 43 is not pressed.

In step 108, the intake switch 47 is set to REC.
Determine whether or not the operation is set to (inside air circulation), and
If ES (set), step 110--
Proceed to set the intake door 5 to RFC, and proceed to return step 150. If No (not REC), proceed to step 112 and set the intake switch 45 to FR.
Determine whether the operation setting is set to ESH (external air intake), and if YES (FRESH), proceed to step 1.
The process proceeds to step 14, where the intake door 5 is set to FRESH, and the process proceeds to return step 150. If NO (the operation setting of the intake switch 45 has not been performed), the process directly advances to return step 150 and returns to the main routine.

Next, in step 104, the AUTO switch 4
The processing after step 106 when 3 is pressed will be described.

In step 56, it is determined whether or not the DEF switch 40d has been pressed, and if YES (it has been pressed), the process proceeds to step 140, where the intake door 5 is set to FRESH (external air intake), and the process proceeds to return step 150. . N
If o (not pressed), the process advances to step 116.

In step 116, it is determined whether the compressor is in OFF mode due to low outside air temperature, that is, whether the outside air temperature is such that the temperature of the air flowing through the cold air bypass passage is too low, and YES (OFF mode) is determined. If so, go to step 118; if No (ON mode), go to step 1
Proceed to 20.

Next, the normal processing after step 120 in which the compressor is in the ON mode in step 116, that is, the temperature of the air flowing through the cold air bypass passage does not become too low, will be described.

In step 120, the vehicle interior temperature set temperature Tset is set to 18°.
If it is YES (Tset = 18 is set at maximum cooling), the process proceeds to step 136, where the intake door 5 is set to REC, and the return stenoop 1 is set to REC.
Go to 50. If NO (Tset +18), the process advances to step 122.

In step 122, the outside air temperature Ta is determined, and T
When a is less than 18°C, the process proceeds to step 140, where the intake door is set to FRESH, and the process proceeds to return step 150. When the outside air temperature Ta is 23°C or higher (1
Hysteresis is provided between 8°C and 23°C. ), the process proceeds to step 124.

In step 124, the near mix door opening degree θX is determined. When the opening degree θX is 20 degrees or less, the process proceeds to step 126, and when the opening degree θX is 50 degrees or more (20 degrees
Hysteresis is provided between 50° and 50°. )
In step 140-1, the intake door 5 is opened.
is set to FRESH and proceeds to return step 150-\.

In step 126, it is determined whether the air volume control of the blower 7 is automatic control. If YES (auto), the process advances to step 12B; if No (manual), the process advances to step 130.
Proceed to.

In step 130, the air volume B of the blower 7 under manual control is compared with the air volume BLA under automatic control.
If LM>BLA, the process proceeds to step 132 and sets the manually controlled air volume BLM to the current air volume (the manual air volume BLM is set to the current air volume BL). BLM≦
If it is BLA, the process proceeds to step 12B and the air volume BLA by auto control is set as the current air volume (auto air volume BL
A is the current air volume B.

). After the processing in step 128 or step 132, the process proceeds to step 134, where the current magnitude of the air volume Bt (for example, divided into five levels) is determined. If the air volume BL is less than one level (small air volume),
Proceed to step 134 and open the intake door 5 with REC and F.
Set RESH to mixed Mlχ position, step 1
Go to 50. If the air volume BL is 5 levels (large air volume) or more, the process proceeds to step 136 and the intake door 5 is opened.
is set in REC, and the process advances to return step 150 to return to the main routine.

If it is determined in step 116 that the compressor is in OFF mode (YES), the process proceeds to step 118.

In step 118, it is determined whether the cold air bypass door is open. If No, the process proceeds to step 120, and if YES, the process proceeds to step 142.

The processing after step 142 is a process for controlling the intake door 5 to appropriately increase the temperature of the air passing through the cold air bypass passage when the temperature of the air passing through the cold air bypass passage is too low. The door opening degree θ, N is displaced from the position of 100% FRESI (when the outside temperature is low) to a position on the REC side by a predetermined amount. This displacement amount (intake door target opening degree θ′,)
e (Te is calculated using the total signals TI and T3, but whichever is smaller is used) and the total signal T1.

First, in step 142, the intake door target opening degree θ IH is calculated, and the intake door target opening degree θ IN is determined by Te' being the evaporator blowing target temperature,
The difference between this Te' and the above Te is ΔTe (ΔTe=Te'
-Te ), then θ'+5-K(ΔTe + z
JΔTe dt) (where K is a constant). The opening degree of the intake door 5 is controlled when the compressor is in the off mode, the outside air temperature is 18° C. or lower, and heating is being performed, so the intake door 5 is completely FRESI ((100%)).

In step 144, as shown in FIG. 9, the internal air circulation is restricted, and the intake door target opening degree is set because it is necessary to maintain the A% position and introduce the minimum amount of outside air. whether θ IN is greater than the above A%;
That is, it is determined whether the opening degree is such that a predetermined minimum amount of outside air can be introduced, and if YES (θ IN>A), the steering knob 14 is opened.
Proceed to step 6, and adjust the intake door opening degrees θ and N according to step 1 above.
The intake door target opening angle θ calculated in step 42 is set to 1N, and the process proceeds to return step 150. No (θ′1≦A
), proceed to step 148, set the intake door opening degree 01N to the above-mentioned opening degree of A%, and then
Proceed to section 150.

For example, when the outside air temperature is low and the compressor is in OFF mode (step 116), in order to appropriately increase the temperature of the air flowing through the cold air bypass passage, the intake door 5 is set to 100x FRESH. RF C from the position to the predetermined limit position (A%) (step 1.42 onwards), the cold outside air is controlled so that it does not enter the passenger compartment too much, and the cold air flows through the cold air bypass passage. Make sure the air temperature isn't too cold.

(Effects of the Invention) As described above, according to the present invention, when the outside air temperature is low, for example, in the compressor OFF mode,
By displacing the cold air by a predetermined amount to the side, the temperature of the air flowing through the cold air 1' pass passage is increased, which makes it possible to raise the temperature of the air from the vent outlet to a temperature close to the target temperature inside the vehicle. It is possible to prevent the head temperature from getting too cold and keep it in a comfortable state. Furthermore, since the amount of outside air introduced is ensured at the minimum necessary level, the occurrence of fogging on the window glass can be suppressed as much as possible.

[Brief explanation of drawings]

Fig. 1 is a functional block diagram of the present invention, Fig. 2 is a configuration diagram of the above-mentioned automobile air conditioning control system, Fig. 3 is a flowchart showing the main routine of the microcomputer used in the above-mentioned, and Fig. 4 is a general signal T. , Figure 5 is a diagram showing the characteristics of the target air mix door opening degree based on the overall signal T2, and Figure 6 is a diagram showing the characteristics of the target opening of the air mix door based on the overall signal T2. value TF
FIG. 7 is a diagram showing the characteristics of the blowout mode based on the general signal T3, FIG. 7 is a diagram showing the characteristics of the evaporator blowout target temperature and the cold air bypass door based on the overall signal T3, FIG. is a characteristic diagram of the opening degree of the intake door. 3... Inside air inlet, 4... Outside air inlet, 5... Intake door, 20... Cold air bypass passage, 21. ,. Cold air bypass door, 100 Eva blowout temperature detection means, 200 Cold air bypass door control instruction determination means, 3
00.・ Combreno Sao τ゛mote detection means, 400
．． , Eva blowout target temperature calculation means, 500...Intake door displacement amount calculation means, 600...Intake door drive means, 700. ... Control opening regulation means. ward 臂 a ward α) ward

Claims (1)

[Scope of Claims] 1. An inside air inlet and an outside air inlet provided upstream of an air conditioning passage that blows out temperature-controlled air into the vehicle interior by a temperature adjustment means, and an intake that selectively opens and closes these inside air inlets or outside air inlets. a door; a cold air bypass passage that blows cold air in the air conditioning passage to the upper body of the occupant; a cold air bypass door that controls opening and closing of the cold air bypass passage; an evaporator blowout temperature detection means that detects an evaporator blowout temperature; and the cold air bypass. a cold air bypass door control instruction determining means for determining whether the door is opened; a compressor off mode detecting means for detecting a compressor off mode; Evaporator blowout target temperature calculating means for calculating; and intake door displacement amount calculating means for calculating the displacement amount of the intake door so that the evaporator blowing temperature approaches the evaporator blowing target temperature, and outputting the displacement amount to the intake door driving means for moving the intake door. An air conditioning control device for an automobile, comprising: 2. The automobile according to claim 1, further comprising control opening regulating means for limiting the intake door displacement amount calculated by the intake door displacement amount calculation means so as to maintain at least a predetermined amount of outside air introduced. Air conditioning control equipment.