JPH0785963B2 - Intake door switching device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake door switching device for controlling selection of inside air circulation and outside air introduction in an automobile air conditioner in consideration of an external load.

(Prior Art) Conventionally, an intake door switching device in an air conditioner for an automobile controls whether to introduce outside air or to circulate inside air according to the opening of an air mix door. For example, Japanese Examined Japanese Patent Sho 62
-34204 publication introduces some outside air when the opening of the emmix door detected by the air mix door opening detector is above a certain opening, but once the opening of the air mix door is below the opening In the case of, it is disclosed that the internal air circulation or a part of the external air is introduced by the control data of the blower to suppress an increase in the heat load on the evaporator and increase the cooling effect, thereby contributing to power saving. Has been done.

(Problems to be Solved by the Invention) However, in actuality, under the condition that the outside air temperature and the air volume of the blower are present, even if the whole outside air is introduced, the cooling effect is not impaired. Even in such a state, there was a problem that ventilation was insufficient because the outside air was partially introduced, and the noise of the blower could not be ignored.

Therefore, the present invention solves the above-mentioned conventional problems,
An object of the present invention is to provide an intake door switching device that introduces outside air into the intake door so as not to impair the cooling capacity of the evaporator, and that can perform comfortable cooling without humidity rise, odor, and noise of the blower. .

(Means for Solving the Problem) However, the gist of the present invention is that, as shown in FIG.
Intake door 5 that switches between partial outside air introduction and total outside air introduction
And an actuator 6 that drives the intake door 5.
When the opening of the air mix door 16 detected by the air mix door opening detector 30 is equal to or more than a certain opening, the outside air is partially introduced, and when the opening is less than the certain opening, the internal air circulation or the control data of the blower is used. In an intake door switching device having an intake door control means 100 for outputting a control signal to the actuator 6 so that a part of outside air is introduced, the control data of the blower is input and the air volume of the blower is below a predetermined amount. And an outside air temperature detecting means 300 for detecting that the outside air temperature is below a predetermined value, and the intake door control means 100 includes the outside air temperature detecting means 200.
When the air volume of the blower is detected to be less than or equal to a predetermined air volume and the outside air temperature detection unit 300 detects that the outside air temperature is less than or equal to a predetermined value, the intake door 5 is set to the all outside air introduction position. A signal is output to the actuator 6.

(Operation) Therefore, if the amount detected by the air volume detecting means is equal to or greater than the predetermined amount, the intake door control means instructs the actuator to cause the intake door to circulate inside air (REC). On the other hand, when the amount detected by the air volume detection unit is less than or equal to the predetermined amount and the outside air temperature detection unit detects that the outside air temperature is less than or equal to the predetermined value, the intake control unit introduces the entire outside air into the intake door via the actuator. It is set to the (FRESH) position, so that the above problems can be achieved.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, first, an outline of the air conditioning value for a vehicle will be described. An intake switching device 2 is provided on the most upstream side of the air conditioning case 1, and the intake switching device 2 has an inside air inlet 3 and an outside air inlet 4. An intake door 5 is arranged in a divided portion, and the intake door 5 is operated by an actuator 6 to adjust the intake ratio of the inside air and the outside air taken into the air conditioning case 1.

The blower 7 sucks air into the air conditioning case 1 and blows the air to the downstream side, and an evaporator 8 and a heater core 9 are provided on the downstream side of the blower 7. Evaporator 8
Is connected together with a compressor 10, a condenser 11, a liquid tank 12 and an expansion valve 13 to form a cooling cycle.The compressor 10 is connected to an engine 14 of an automobile via an electromagnetic clutch 15, and the electromagnetic clutch 15 is connected to the engine 10. The drive stop control is performed by the intermittent operation.
The heater core 9 is adapted to circulate the cooling water of the engine 14 to heat the air. An air mix door 16 is provided in front of the heater core 9, and a mode sensor 17 for detecting the temperature of air passing through the evaporator 8 or the temperature of the evaporator itself is provided in front of the air mix door 16. The air mix door 16 determines the ratio of air that passes through the heater core 9 and air that does not pass through the opening degree Θ _x , and a full heat position to a full cool position can be set by an actuator 18 connected via a link mechanism. Operated.

The rear end of the air conditioning case 1 has a defrost outlet.
19, Vent outlet 20 and Heat outlet 21
The mode doors 23a, 23b, 23c are opened in the
And the mode doors 23a to 23c are provided with actuators 24.
The blowout mode can be switched to a vent mode, a bi-level mode, a foot mode or a defrost mode.

The electromagnetic clutch 15 of each of the actuators 6, 8, 24 blower 7 and the compressor 10 has a drive circuit 25a-2.
It is controlled based on the output signal from the microcomputer 26 via 5d. The microcomputer 26 includes a central processing unit (CPU), a read-only memory (R
OM), a random access memory (RAM), an input / output port (I / O), etc., which are known per se, and output to the microcomputer 26 from a vehicle interior temperature sensor 27 for detecting the temperature inside the vehicle interior. Signal, output signal from the outside air temperature sensor 28 that detects the outside air temperature, output signal from the insolation sensor 29 that detects the amount of solar radiation, output signal from the opening detector 30 that detects the opening of the air mix door 16 described above. And an output signal from the temperature setter 31 for setting the air conditioning temperature in the vehicle compartment is selected via the multiplexer (MPX) 32, converted into a digital signal via the A / D converter 33, and input. Has become.

Further, a water temperature switch 34 which detects the water temperature of the heater core 9 and opens / closes at a predetermined temperature is provided, and this output signal is also input to the microcomputer 26.

Next, an example of control operation of the microcomputer 26 will be described. The blower 7, the compressor 10, the air mix door 16
The control of the mode doors 23a, 23b, 23c is omitted because it is the same as the conventional one, and only the control routine of the intake door 5 regarding the introduction of the outside air will be described below.

As shown in FIG. 3, first, at step 50, it is determined whether the control of the intake door 5 is manual or automatic.
If it is automatic, the routine proceeds to step 51, if it is manual, the routine is exited, and the intake door 5 is set to the position according to the setting of the changeover switch (not shown).

In step 51, the switch of the fan of the blower 7
If it is ON, proceed to step 52, and switch off the fan.
If so, proceed to step 65. If the compressor 10 is in the ON mode in step 52, the process proceeds to step 53, and in the OFF mode, the process proceeds to step 65. In step 53, if the vehicle compartment set temperature Td is the maximum cooling position (MAX cool), the process proceeds to step 53, and if it is not MAX cool, the process proceeds to step 54. In step 54, the vehicle compartment temperature T _R or the outside air temperature
It is determined whether or not the detection sensors 27 and 28 have a failure in T _A. If there is a failure, the routine is exited, and if not, the process proceeds to step 55. In step 55, when the outside air temperature T _A is 18 ° C. or less, the process proceeds to step 65, where the outside air temperature T _A is
When the temperature is 23 ° C. or higher (the hysteresis is provided between 18 ° C. and 23 ° C.), the process proceeds to step 56.

In step 56, the opening Θ _x of the air mix door 16
If the angle is less than 20 degrees, proceed to step 57. If the angle is more than 50 degrees (20
Hysteresis is provided between 0 and 50 degrees)
Go to step 62. In step 57, it is determined whether the fan switch of the blower 7 is automatic or manual. If it is automatic, the process proceeds to step 60, and if it is manual, the process proceeds to step 58. In step 58, the air volume BLM of the blower 7 is manually compared with the air volume BLA of the auto, and BLM> B
If it is LA, go to step 59 and manually set the air volume BLM.
After setting to the air volume BL, the process proceeds to step 61. Also, BLM
If ≦ BLA, proceed to step 60 and automatically set the air volume BLA.
After setting to the air volume BL, also proceed to step 61. In step 61, the amount of air flow BL (for example, LOW, MED, HI
It is divided into three stages. ) Is determined, the process proceeds to step 62 when the air volume BL is LOW (low air volume) or less, and proceeds to step 63 when the air volume BL is MED (medium air volume) or more.

In step 62, the outside air temperature T _A is determined and T _A >
If 22 ° C, proceed to step 65. If T _A > 27 ° C (22 ° C
≤ T _A ≤ 27 ° C is the hysteresis range) is step 64
Proceed to. On the other hand, in step 63, the intake door 5 is set to REC (internal air circulation). In step 64, the intake door is set to MIX (mixing the inside air and the outside air). Then, in step 65, FRESH the intake door 5.
(Introduce outside air). Therefore, the air volume BL in step 61
In the determination of, if the air volume is HI, the intake door 5 is controlled so as to circulate the inside air (step 63) to prevent introduction of, for example, humid and odorous outside air into the vehicle interior. become. Also, in step 61, the air volume
Even if BL is judged to be LOW, if the outside air temperature T _A is higher than 27 ° C and is relatively high, the outside air introduction is not set to 100%, but a part of the outside air is introduced and mixed with the inside air. This prevents the air from deteriorating. Then, in step 61, when the air volume BL is LOW and the outside air temperature T _A is 22 ° C. or less and is relatively low (step 62), that is, when the humidity of the outside air is not high and the influence of outside air is small because the air volume is small. , Intake door 5 FRESH (100% outside air introduced)
In this way, the cooling capacity of the evaporator is supplemented.

Therefore, for example, in the control of the intake door 5 when the outside air temperature T _A is 20 to 25 ° C. and there is solar radiation, the start-up initial stage of the cooling system in which the air volume is HI is set to REC (internal air circulation), and when the start-up is stable If it is set to FRESH (100% introduction of outside air) for LO), it is possible to send a cool and refreshing breeze that is not so much affected by outside air into the vehicle interior without impairing the cooling capacity of the evaporator.

In this way, the outside air is introduced (the intake door 5 is set to FRESH) only when the air volume is small and the outside air temperature is relatively small, so that moist air or odor does not enter the vehicle interior, and Since the air volume when introducing is small,
The noise of the blower can also be suppressed as much as possible.

(Effects of the Invention) As described above, according to the present invention, the amount of air introduced into the outside air (FRESH) by controlling the intake door is small (LOW).
Since it was done only when the outside air temperature is relatively low (humidity is relatively low), it is possible to avoid introducing high temperature or odorous outside air into the vehicle interior as much as possible By using the introduction (FRESH), the cooling capacity of the evaporator can be supplemented, so that passengers can experience cool and refreshing cooling. Also,
The outside air introduction (FRESH) has a much lower noise level of the blower than the inside air introduction (REC), so it is possible to prevent the noise inside the vehicle as much as possible.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing the configuration of the present invention, FIG. 2 is a configuration diagram showing an automobile air conditioner in an embodiment of the present invention, and FIG. 3 is an intake door control routine of the microcomputer used in the above. It is a flowchart. 5 ... Intake door, 6 ... Actuator, 16 ...
Air mix door, 28 ... outside temperature sensor, 30 ... air mix door opening detector, 100 ... intake door control means, 200 ... air volume detection means, 300 ... outside air temperature detection means.

Front page continuation (72) Inventor Tsutomu Fujiki 3-1, Fuchu-cho Shinchi, Aki-gun, Hiroshima Mazda Co., Ltd. (72) Inventor Koji Nakazaki 3-3-1 Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd.

Claims (1)

[Claims] 1. An intake door for switching air introduction from the upstream side of an air conditioning duct to internal air circulation, partial external air introduction, and total external air introduction, an actuator for driving the intake door, and an air mix door opening detector. When the opening of the air mix door is more than a certain opening, the outside air is partially introduced, and when it is less than the certain opening, a control signal is output to the actuator to circulate the inside air or partially introduce the outside air according to the control data of the blower. In the intake door switching device equipped with the intake door control means, the air volume detection means for inputting the control data of the blower to detect that the air volume of the blower is below a predetermined air volume, and the outside air temperature being below a predetermined value. And an intake air control means for detecting the air temperature of the blower by the intake air control means. When the outside air temperature is detected to be below a predetermined value and the outside air temperature detecting means detects that the outside air temperature is below a predetermined value, a control signal for setting the intake door to the entire outside air introduction position is output to the actuator. An intake door switching device characterized in that