JPH04113917A - Intake controlling device for air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To avoid a temperature rise at an evaporator, and perform ventilation sufficiently by controlling an intake door to be at the optimum position for the capacity of a compressor, and introducing outer air in the optimum quantity for the degree of an excessive ability of the compressor. CONSTITUTION:The ratio of the quantity of introduced outer air to the quantity of introduced inner air is adjusted by an inner/outer air introducing quantity adjusting means by an opening of an intake door. The temperature of air just after passing an evaporator is detected by a duct sensor 2. A cooling cycle is composed of a capacity changeable compressor 3 as well as the evaporator. The capacity of the compressor 3 is controlled by a compressor capacity controlling means 4. In this constitution, the capacity of the compressor 3 is detected by a means 5. A control signal is supplied to the inner/outer air introducing quantity adjusting means 1 to an intake door control means 6 based on a detected value. The intake door is thus moved to the optimum position for the capacity of the compressor 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an intake control device in a vehicle air conditioner using a variable capacity compressor.

[Prior Art] In a conventional vehicle air conditioner, for example,
As described in Japanese Patent No. 53366, the required blowout air temperature is calculated based on the vehicle interior temperature, outside air temperature, amount of solar radiation, and set temperature, and the intake door is controlled according to the calculation result.

On the other hand, recently, air conditioners using variable capacity compressors have appeared, and in this type of air conditioner, the capacity of the compressor is controlled according to the air temperature immediately after the evaporator detected by a duct sensor.

[Problems to be Solved by the Invention] As described above, conventionally, the intake door is controlled regardless of the capacity of the compressor. Therefore, for example, even though the compressor's cooling capacity is insufficient, the intake door may be controlled to increase the amount of outside air introduced, causing the evaporator temperature to rise, or even when the compressor has sufficient excess capacity, the intake door may be There were cases where the door was controlled to increase the amount of inside air introduced, resulting in insufficient ventilation.

[Means for Solving the Problems] In order to solve the above problems, the intake control device of the present invention adjusts the ratio of the amount of outside air introduced and the amount of inside air introduced according to the opening degree of the intake door, as shown in FIG. a duct sensor 2 that detects the temperature of the air immediately after passing through the evaporator, a variable capacity humbre nosa 3 that forms a cooling cycle together with the evaporator, and a duct sensor 2 that detects the temperature of the air immediately after passing through the evaporator; A compressor capacity control means 4 for controlling the capacity of the compressor according to the above, further comprising a means 5 for detecting the capacity of the compressor, and a means for adjusting the amount of air introduced into the inside and outside 1 according to the detected value of the means 5. The present invention is characterized in that an intake door control means 6 for supplying a control signal is provided.

Here, the intake door control means 6 in the invention of claim 1 supplies a control signal to the inside/outside air introduction N adjustment means 1 so as to move the intake door to an optimal position according to the detected value of the compressor capacity detection means 5. It is something.

Further, the intake door control means 6 in the invention of claim 2 periodically compares the detected value of the compressor capacity detection means 5 with a preset reference value, and opens the intake door by a minute unit amount according to the comparison result. A control signal for increasing or decreasing the temperature is supplied to the internal/external air introduction amount adjusting means 1.

[Operation] According to the device of the invention of claim 1, the intake door is controlled to the optimum position according to the compressor capacity. Therefore, an optimal amount of outside air is introduced according to the degree of surplus capacity of the compressor, an increase in the temperature of the evaporator is avoided, and sufficient ventilation is performed.

According to the apparatus of the second aspect of the invention, the compressor capacity is compared with a reference value by the intake door control means 6, and the intake door opening degree is increased or decreased by a minute unit amount in accordance with the comparison result. Then, due to the change in the opening degree of the intake door, the temperature of the evaporator changes, and this change is detected by the duct sensor. When the detected value of the duct sensor changes, the capacity of the compressor changes.

By repeating this process periodically, the intake door is controlled so that the intake amount of internal and external air is optimized, and accordingly, the compressor capacity is controlled within a predetermined range determined by the reference value. Therefore, an optimal amount of outside air is introduced in accordance with the surplus capacity of the compressor, an increase in the temperature of the evaporator is avoided, and sufficient ventilation is performed.

[Example] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 2 shows a schematic configuration of an automobile air conditioner incorporating the intake control device of the embodiment. In this air conditioner, an inside air population 10A and an outside air inlet 10B are formed at the most upstream part of the air conditioning duct 10, and the inside air and outside air to be introduced into the air conditioning duct 10 are controlled by controlling the opening of the intake door 11. It is now possible to adjust the proportion of

The air conditioning duct io is provided with a blower fan 12, an evaporator 13, an air mix door 14, and a heater 15 in this order toward the downstream side. The evaporator J3 is connected to the compressor 16, the condenser 17, the evaporator tank 18, and the expander valve 19 by piping.
It constitutes a refrigeration cycle.

As the compressor 16, Japanese Patent Application Laid-Open No. 52-9640
A wobble plate type variable capacity compressor of the same type as that shown in Japanese Patent Publication No. 7, Japanese Patent Application Laid-Open No. 63-9682, etc. is used.

To explain this compressor 16 simply, the capacity is determined by the inclination angle of the swash plate (oscillating plate), the inclination angle of the swash plate is determined by the pressure in the crank chamber, and the pressure in the crank chamber is determined by the actual opening of the solenoid valve. Determined by degree. In other words, increasing the current supplied to the solenoid valve will reduce the compressor capacity, and decreasing the current supplied to the solenoid valve will increase the combined capacity. Therefore, in this compressor, the strain/id valve constitutes the capacity adjustment mechanism 16A.

Further, the compressor 16 is equipped with a stroke sensor 16B that detects the inclination of the swash plate, and the current discharge capacity can be determined from the detected value of the stroke sensor 16B.

The variable capacity compressor 16 is driven by power transmitted from the engine, and is controlled by engaging and connecting an electromagnetic clutch (not shown).

The air mix door 14 adjusts the ratio of air passing through the heater 15 to air not passing through the heater 5, depending on the degree of opening. The air that has passed through the heater 15 and the air that has not passed through the heater 15 are mixed on the downstream side of the heater 15, the temperature of which is adjusted, and the air is blown out from the outlet into the vehicle.

The rear end of the air conditioning duct 10 has a Tefrost outlet 2 that blows air toward the inner surface of the front window, a Ghent outlet 22 that blows air toward the occupant's face, and a Ghent outlet 22 that blows air toward the occupant's feet. The air outlet 23 is divided into two air outlets D21, 22.
23 are each provided with a mode door 24, 25, 26.

By selectively opening and closing these mode doors 24, 25, and 26, the blowing mode can be changed.

The above-mentioned intake door 11, air mix door 14,
Each of the mode doors 24-26 is operated by an actuator 27.
Opening/closing is controlled by 28 and 29.

Each of these actuators 27 to 29, the blower fan 12,
The capacity adjustment mechanism 16A of the compressor 16 and the electromagnetic clutch are each driven and controlled by a control unit 50.

The control unit 50 controls each actuator 2 mentioned above.
7-29, ventilation fan 12, capacity adjustment mechanism 16A, 1!
It includes a drive circuit that drives a magnetic clutch etc., a microcomputer that supplies control signals to each drive circuit, an A/D converter connected to the microcomputer, and a multiplexer.

And A included in this control unit 5o
The /D converter includes a potentiometer 5 which detects the opening degree of the near mix door 140, a solar radiation sensor 52 which detects the amount of solar radiation entering the vehicle interior, an outside temperature sensor 53 which detects the outside air temperature, and a representative sensor inside the vehicle interior. An inside air temperature sensor 54 that detects the temperature, and a temperature setting device 55 that sets the temperature inside the vehicle interior.
and a duct sensor 56 that detects the temperature of the air immediately after passing through the evaporator 13, and the detection data from each sensor is input to the microcomputer.

Next, an example of the control operation of the microcombination unit in the control unit 5o will be described.

Note that the ventilation control, air mix door control, and mode door control are the same as the conventional ones, so their explanations will be omitted here.

Compressor control is also the same as before, but to briefly explain, the microcomputer controls the duct sensor 5.
Based on the evaporator temperature detected by 6, a drive signal is supplied to the capacity adjusting means 16A to control the compressor capacity. That is, the higher the evaporator temperature, the more the compressor capacity increases, and the lower the evaporator temperature, the lower the compressor capacity.

Next, the contents of intake control will be explained.

FIG. 3 is a flowchart of intake control shown as a first embodiment of the present invention. This control routine is repeatedly executed at regular intervals. When the processing of this routine starts, in the first step 101, various switch signals and sensor (outside air temperature sensor, stroke sensor) signals are input. Next, in step 102, intake AUT○
(a mode for automatically controlling the intake door) is selected.

If intake AUTO is not selected, the determination in step 102 is NO, and steps 103 and 104
Proceeding to step 105, it is determined whether the manual switch is operated to ``rFRESH (outside air introduction)'' or ``rREc (residence air circulation)''. If it is operated to rFREs)Ij, proceed to step 105. Control the intake door to the FRESH position. If the rRECJ is being operated, the process proceeds to step 106 and the intake door is controlled to the REC position. If neither is the case, the judgments in Steps 103 and 104 are all No, and the process returns to the main routine (not shown).

On the other hand, if intake AUTO is selected, the determination in step 102 is YES, and the following steps are performed in order: whether the air outlet mode is DEF (defrost), whether the fan switch (FAN SW) is ON, and whether the air conditioner switch (A /CSW) Check to see if it is turned on.

If the blowout mode is DEF, the fan switch is OFF, or the air conditioner switch is OFF, the process advances to step 105 and the intake door is controlled to the FRESH position.

Also, if the blowout mode is not DEF and the fan switch is ON, and the air conditioner switch is also ON,
Proceed to step 110. In this step 110, it is determined whether the outside temperature q T a is larger or smaller than a reference value having a predetermined hysteresis. That is, it is determined whether the temperature is on either side A or H with respect to a reference value a (for example, 18°C) on the downward side and an M quasi-value b (for example, 22°C) on the upward side.

If it is on the A side, it means that the outside air temperature is below the standard, and in order to fully introduce outside air, the process proceeds to step 105 and the intake door is controlled to the FRESH position. If it is on the B side, the outside air temperature is above the standard, so the intermediate opening degree control of the intake door described below is performed.

That is, first, in step 111, the detected value p of the stroke sensor is read, and the process proceeds to the next step 112. The stroke sensor 112 calculates the optimal position (opening degree) of the intake door corresponding to the stroke p from a map stored in advance in the ROM based on the detected value p of the stroke sensor, and moves the intake door to the calculated optimal position. Control position.

Then return to the main routine.

In this way, when the intake AUTO is selected, the intake door is controlled to the optimum position according to the current capacity of the intake door. Therefore, an optimum amount of outside air is introduced according to the surplus capacity of the evaporator, and an increase in the temperature of the evaporator is avoided, and sufficient ventilation is achieved.

Next, the intake control operation of the second embodiment of the present invention will be described. The control operation in this embodiment is as shown in step 112 in FIG.
The feature is that step 112° in FIG. 4 is executed instead of . The rest is the same as in the first embodiment, so a description thereof will be omitted.

The above step 112° is further divided into smaller steps, and first, in step 112°-1,
It is determined whether the ratio ST of the stroke sensor detection value to the maximum value (hereinafter referred to as stroke ratio) is larger or smaller than a reference value having preset hysteresis. That is, it is determined whether the ST value is on the A or B side with respect to the descending reference value of 90% and the ascending reference value of 95%.

If it is on the A side, proceed to step 112°-2 and increase the opening degree of the intake door by β%. Moreover, if it is the B side, the process proceeds to step 112°-3, and the opening degree of the intake door is decreased by α%. Note that the values of α% and β% are minute unit amounts, and the minimum opening adjustment unit amount determined from the mechanism is ~5%.
Set to a value of about The values of α and β may be different from each other, but of course they may be equal. After adjusting the intake door opening degree by α% and β%, the process returns to the main routine.

Since the intake control of this second embodiment is executed periodically, the following effects can be obtained.

The capacity of the compressor in one process! (corresponding to the detected value of the stroke sensor), the intake door opening degree is increased or decreased by a minute unit amount. Then, as the opening degree of the intake door changes, the amount of outside air introduced changes, so the temperature of the evaporator changes, and the change is detected by the duct sensor. When the detected value of the duct sensor changes, the capacity of the compressor changes accordingly.

Therefore, in the next process, the intake door opening degree is readjusted based on this changed capacity. By repeating this process, the optimal intake door opening degree is determined according to the compressor capacity. Further, in conjunction with this, the compressor capacity is controlled within a predetermined range determined by a reference value, in this case a range of 90% to 95% (corresponding to the stroke ratio).

For this reason, the amount of outside air introduced can be set to the maximum without leaving almost any remaining capacity of the compressor, and sufficient ventilation can be performed. Furthermore, since the intake door is controlled in accordance with the compressor capacity, an increase in the temperature of the evaporator is avoided.

Next, the intake control operation of the third embodiment of the present invention will be described. The control operation in this embodiment is as shown in step 112 in FIG.
The feature is that step 112'' in FIG. 5 is executed instead of step 112'' in FIG. 5.The rest is the same as in the first embodiment, so a description thereof will be omitted.

The above step 12'' is further divided into smaller steps, and first, in step 112''-1, it is determined whether the timer that determines the adjustment cycle of the intake door opening degree has been cleared.

If it is cleared, start the timer in step 112"-2 and count 60 seconds. Then, in step 1
Based on the determination of 12''-3, the following process is performed every 60 seconds.

In other words, first clear the timer in step 11.
2”-4), then step 112”-5 and step 1
12"-6 to check the capacity ratio of the compressor. The capacity ratio is (current capacity) / (maximum capacity) and corresponds to the stroke ratio mentioned above. This capacity ratio is referred to as "operation rate." It can also be replaced with .

Then, step 112"-5 and step 112"
-6, it is determined whether the current capacity ratio is 60% or more or 40% or less, and if it is 60 or more, the process proceeds to step 112"-7, and the intake door is moved by 5% to the FRESH side.

In addition, if the capacity ratio is 40% or less, step 112''-
Proceed to step 8 and move the intake door 5% to the REC side. Moreover, if it is between 40% and 60%, the process returns to the main routine without changing anything.

According to the intake control of the third embodiment, the opening degree of the intake door is adjusted every 60 seconds. And the second above
As in the embodiment, the optimum intake door opening degree is determined according to the compressor capacity.

Further, the compressor capacity is accordingly controlled within a predetermined range determined by a reference value, in this case a range of 40% to 60% (capacity ratio). For this reason, it is possible to introduce an optimal amount of outside air while achieving power savings for the compressor. Furthermore, since the intake door is controlled in accordance with the compressor capacity, an increase in the temperature of the evaporator is avoided.

In addition, in the above-mentioned embodiment, a case was shown in which a wobble plate type variable capacity compressor was used, but the present invention can of course be applied to cases in which other compressors such as a rotary type variable capacity compressor are used. . However, in that case, the structure of the capacitance detection means also needs to be changed accordingly.

[Effects of the Invention] As explained above, according to the intake control device of the present invention, the intake door is controlled according to the capacity of the compressor. Therefore, an optimum amount of outside air is introduced according to the surplus capacity of the combination 7, and an increase in the temperature of the evaporator is avoided, and sufficient ventilation is performed.

In addition, in the apparatus of the invention of claim 2, since the compressor capacity is controlled within a predetermined range determined by the reference value, power-saving operation can be performed depending on the way the reference value is set, and the compressor capacity is It is also possible to operate by reducing the capacity and increasing the amount of outside air introduced as much as possible.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is a schematic diagram showing the configuration of one embodiment of the present invention, FIG. 3 is a flowchart showing control details of one embodiment of the present invention, and FIG. 4 is a flowchart showing the control details of another embodiment, and FIG. 5 is a flowchart showing the control details of another embodiment. 1... Introduce air inside and outside! 1 Adjustment means 2... Duct sensor 3... Variable capacity compressor 4 - Compressor capacity control means 5 Fumbrenosa capacity detection means 6 - Intake door control means 10A - Inside air inlet, IOB, Outside air population 11...
... Intake door 13 ... Evaporator 16 ... Variable capacity compressor 16A Capacity adjustment mechanism 16B ... Stroke sensor (capacity detection means) 2
7. Intake door actuator 50... control controller, 56... duct sensor,

Claims (2)

[Claims] (1) A cooling cycle is configured together with an evaporator, an inside/outside air introduction amount adjusting means that adjusts the ratio of outside air introduction amount and inside air introduction amount depending on the opening degree of the intake door, and a duct sensor that detects the temperature of the air immediately after passing through the evaporator. A vehicle air conditioner comprising a variable capacity compressor and compressor capacity control means for controlling the capacity of the compressor in accordance with a detected value of the duct sensor, comprising means for detecting the capacity of the compressor and a detected value of the means. 1. An intake control device for a vehicle air conditioner, comprising: an intake door control means for supplying a control signal to the inside/outside air introduction amount adjusting means so as to move the intake door to an optimal position according to the above. (2) A cooling cycle is configured together with an evaporator, an inside/outside air introduction amount adjusting means that adjusts the ratio of outside air introduction amount and inside air introduction amount depending on the opening degree of the intake door, and a duct sensor that detects the temperature of the air immediately after passing through the evaporator. A vehicle air conditioner comprising a variable capacity compressor and compressor capacity control means for controlling the capacity of the compressor according to a detected value of the duct sensor, comprising: means for detecting the capacity of the compressor; and a means for periodically detecting the capacity of the compressor. an intake door control means that compares the detected value with a preset reference value and supplies a control signal to the inside/outside air introduction amount adjusting means to increase or decrease the intake door opening degree by a minute unit amount according to the comparison result; An intake control device in a vehicle air conditioner, characterized by comprising: