JPH0781370A - Aspirator device - Google Patents

Abstract

PURPOSE:To prevent any drop in blowoff air quantity at the time of requiring a large air quantity actually by making an air leak from the primary air passage of an aspilator into the irreducible minimum of necessity. CONSTITUTION:A secondary air suction nozzle 38 is installed in a venturi tube 37 of an aspilator 35, connecting this venturi tube 37 to an inlet port 40 of a draft air duct 20, and a part of air in this air duct 20 is made to flow into the venturi tube 37 from the inlet port 40, and thereby an air intake action is produced in the secondary air suction nozzle 38. An interval between this secondary air suction nozzle 38 and a sensor storage case 33 of an inside air temperature sensor 32 is connected with a hose 41, and air in a car room is inducted into the sensor storage case 33. In addition, an aspilator damper 42 is installed in the inlet port 40 of the venturi tube 37, and when traget blowoff temperature is less than the specified temperature (for example, imnediately after starting the operation of air conditioning under the blazing sun in midsummer), this aspilator damper 42 is closed, preventing an air leak into the venturi tube 37 from occurring, and thus a large air quantity is secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aspirator device for introducing air inside a vehicle into an installation space for an inside air temperature sensor.

[0002]

2. Description of the Related Art Conventionally, in an air conditioner for an automobile, an inside air temperature sensor for detecting the temperature of the air in the passenger compartment is installed inside an instrument panel, and the inside air temperature sensor is installed in a space inside the passenger compartment. Some have an aspirator for introducing air. The conventional aspirator introduces a part of the wind flowing through the inside of the air conditioner for the vehicle to the inside of the vehicle, as described in Nippon Denso Public Technical Report (reference number 81-021) and Japanese Utility Model Laid-Open No. 142304/1990. Primary air passage (venturi pipe) and a secondary air passage (secondary air intake nozzle) that introduces the air in the passenger compartment into the installation space of the inside air temperature sensor by causing an air intake action by the wind flowing through the primary air passage It is configured with and.

[0003]

However, in the above-mentioned conventional configuration, a part of the wind to be blown into the vehicle compartment during the air conditioning operation always leaks from the primary air passage of the aspirator to the inside of the instrument panel. There was a problem that the amount of air blown into the room was reduced.

The present invention has been made in consideration of such circumstances, and an object thereof is to prevent the air leakage from the primary air passage of the aspirator to a necessary minimum and to actually require a large air volume. An object of the present invention is to provide an aspirator device capable of avoiding a decrease in blown air volume.

[0005]

In order to achieve the above object, an aspirator device of the present invention is provided with a primary air passage for introducing a part of the wind flowing in the interior of an air conditioner for an automobile to the passenger compartment side, and the primary air passage. An aspirator damper that opens and closes the primary air passage, and a secondary air passage that causes an air intake action by the wind flowing through the passage to suck the air in the passenger compartment into the installation space of the inside air temperature sensor; And a control means for controlling to close the aspirator damper when the target outlet temperature of the air conditioner for air conditioning is below a predetermined temperature.

[0006]

In an automobile air conditioner called a so-called automatic air conditioner, in the automatic (automatic) operation mode, for example, as shown in FIG. Although the voltage level (blowing air volume) and the like can be switched, in the region where the target blowing temperature is E ° C. or less, the blowing mode, the blower voltage level, and the like are kept constant, so the predetermined temperature G in this region is maintained.
If the temperature is below ℃, even if there is a slight error in the temperature detected by the inside air temperature sensor, it does not affect the control contents such as the blowout mode and the blower voltage level.

Focusing on this point, in the present invention, when the target outlet temperature is equal to or lower than a predetermined temperature (for example, immediately after the start of the air conditioning operation under hot summer conditions), the aspirator damper is closed and the primary air passage of the aspirator device is closed. Shut off. As a result, the temperature inside the passenger compartment is significantly higher than the set temperature, such as immediately after the start of air conditioning operation under hot summer conditions.
When it is actually necessary to blow out the cool air with a large air volume, the air leakage into the primary air passage is eliminated to secure a large air volume.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, the schematic configuration of the entire vehicle air conditioner will be described with reference to FIG. At the upstream side of the blower duct 20, an outside air intake port 2 for taking in air (outside air) outside the vehicle compartment
1 and the inside air intake port 22 for sucking the air (inside air) in the vehicle compartment
And are provided. An inside / outside air damper 23 is provided at an intermediate portion between the outside air intake port 21 and the inside air intake port 22,
By adjusting the opening degree of the inside / outside air damper 23 by the servo motor 24, the introduction ratio of the inside / outside air is switched. A blower 25 is provided on the downstream side of the inside / outside air damper 23, and on the downstream side of the blower 25,
An evaporator 26 of a refrigeration cycle that cools and dehumidifies the intake air is arranged.

Further, on the downstream side of the evaporator 26, a heater core 27 for circulating engine cooling hot water and an air mix damper 28 are provided. By adjusting the opening of the air mix damper 28 by a servo motor 29, The blowing temperature is adjusted by changing the mixing ratio of the air passing through the heater core 27 and the air not passing through the heater core 27. The wind whose temperature has been adjusted in this manner is changed by switching the blowout mode damper (not shown) to the DEF blowout port 30.
a, the FACE outlet 30b, or the FOOT outlet 30c is blown into the vehicle interior.

On the other hand, inside the instrument panel 31, an inside air temperature sensor 32 for detecting the temperature of the air in the vehicle compartment is installed. The inside air temperature sensor 32 is housed in a sensor housing case 33, and the ventilation hole 3 of the instrument panel 31 is housed in the sensor housing case 33.
The air in the vehicle compartment is introduced through 4. The introduction of air into the sensor storage case 33 is caused by an aspirator 35 provided on the downstream side of the air mix damper 28.

As shown in FIG. 2, the aspirator 35 includes a venturi pipe 37 that forms a primary air passage and a secondary air suction nozzle 38 that forms a secondary air passage.
The tip of the secondary air suction nozzle 38 has a venturi tube 3
7 into the large-diameter pipe portion 37a on the upstream side of the venturi pipe 3
7 is arranged so as to face the inlet of the diffuser portion 37b on the downstream side. The upstream large-diameter pipe portion 37a of the venturi pipe 37 has an inlet port 4 formed in the blower duct 20.
0, and a part of the wind flowing in the blower duct 20 is introduced into the venturi pipe 37 from the inlet 40. The Venturi effect is generated around the tip of the secondary air intake nozzle 38 by the air flowing in the venturi pipe 37, so that the inside of the secondary air intake nozzle 38 is made negative pressure and the secondary air intake nozzle 38 is inhaled with air. It causes an action. By connecting a hose 41 between the secondary air suction nozzle 38 and the sensor storage case 33 of the inside air temperature sensor 32, the air in the vehicle compartment is moved to the sensor storage case 33 → hose 41 → secondary air suction nozzle 38 → It is adapted to be inhaled through the Venturi tube 37.

In this embodiment, an aspirator damper 42 is provided at the inlet 40 of the Venturi tube 37. The aspirator damper 42 is connected to the air mix damper 28 via a link mechanism 43. The configuration of the link mechanism 43 will be described below with reference to FIG. The V-shaped first lever 45 is fixed to the output shaft 44 of the servomotor 29 that drives the air mix damper 28.
A second lever 47 is connected to the lever 45 via a connecting bar 46. The second lever 47 is fixed to the rotary shaft 48 of the air mix damper 28, and the rotation of the servo motor 29 is transmitted to the air mix damper 28 through the route of the first lever 45 → the connecting bar 46 → the second lever 47. It has become. Further, a fitting pin 49 is provided on the first lever 45 so as to project, and the fitting pin 49 is slidably fitted in an arcuate cam groove 51 formed on one end side of the third lever 50. At the other end of the third lever 50, a connecting pin 52
The fourth lever 53 is connected via the
3 is fixed to the rotating shaft 54 of the aspirator damper 42. The aspirator damper 4 is attached to the fourth lever 53.
A return spring 55 for urging 2 in the opening direction is attached. The link mechanism 43 described above is equivalent to
-42841, which is the same as the link mechanism shown in FIG.

The aspirator damper 42 and the air mix damper 28 are constructed by the link mechanism 43 having the above-described structure.
The opening characteristic of is designed as shown in FIGS. That is, the servomotor 29 (first lever 45) is set to 98
When rotated from 0 ° (MAX · COOL) to 0 ° (MAX · HOT), the air mix damper 28 starts rotating (opening) after the aspirator damper 42 finishes rotating (opening). At the same time, the end of the rotation of the aspirator damper 42 and the start of the rotation of the air mix damper 28 are deviated by a predetermined amount.

Specifically, as shown in FIG. 4, the rotation angle of the first lever 45 (the rotation angle of the servo motor 29) is 98 °.
When changing from (MAX · COOL) to 0 ° (MAX · HOT), the air mix damper 28 is slightly displaced in the fully closing direction in the range from 98 ° to 82.5 °. The fluctuation is about the compression margin of the packing (not shown) attached to the air mix damper 28, and the fluctuation is within the range where there is no air leakage. After this, 8
The air mix damper 28 substantially maintains the MAX / COOL state (fully closed state) between 2.5 ° and 73.5 ° and rotates from 73.5 ° to 0 ° (MAX / HOT). Sometimes, the air mix damper 28 is changed according to the turning angle.
Is designed to rotate in the opening direction.

On the other hand, as shown in FIG. 5, the first lever 45 of the aspirator damper 42 is 98 ° (MAX.
When it is rotated from (COOL) to 82.5 °, it is rotated from the fully closed position to the fully opened position, and the fully opened state is maintained in the range of 82.5 ° or less. As a result, there is a difference of 9 ° between when the aspirator damper 42 is turned (82.5 °) and when the air mix damper 28 is opened (73.5 °). If there is this difference,
At the same time as the aspirator damper 42 is opened by the overrun of the servo motor 29, the air mix damper 28 is turned to H level.
It can be surely prevented from opening to the OT side.

The operation of the servomotor 29 for driving the aspirator damper 42 and the air mix damper 28 is as follows.
It is controlled by the air conditioning control circuit 56 (see FIG. 1). The air conditioning control circuit 56 is composed of, for example, a microcomputer, and has an inside air temperature Tr detected by the inside air temperature sensor 32, an outside air temperature Tam detected by an outside air temperature sensor 57, and a solar radiation intensity T detected by a solar radiation sensor 58.
s and the set temperature Tset set by the temperature setter 59 are read, and the target outlet temperature TAO is calculated by the following equation (1) based on these data. TAO = Kset-Tset-Kr-Tr-Kam-Tam-Ks-Ts + C (1) In this equation (1), Kset is a temperature setting gain and Kr.
Is the inside air temperature gain, Kam is the outside air temperature gain, Ks is the solar radiation gain, and C is a correction constant.

In accordance with the target outlet air temperature TAO calculated by the equation (1), the air conditioning control circuit 56, as shown in FIG. 6, has the outlet mode, the air mix damper 28 opening, the aspirator damper 42 opening, and the blower 25. It controls the voltage level of. Here, the opening degrees of the air mix damper 28 and the aspirator damper 42 are controlled by changing the target opening degree SW of the servo motor 29 according to the target outlet temperature TAO, as shown in FIG. 7. In this case, the target opening degree SW = 0% of the servo motor 29 is set to the first lever 4 shown in FIG.
5 rotation angle = 98 °, SW = A% is 82.5 °
, SW = B% corresponds to 73.5 °, and SW = 1
00% corresponds to 0 °.

In this embodiment, the aspirator damper 42
Since there is a feature in controlling the opening degree of, the control principle will be described. As shown in FIG. 6, the blowout mode, the opening degree of the air mix damper 28, and the blower 25 are set according to the target blowout temperature TAO.
However, in the region where the target outlet temperature TAO is E ° C. or less, the outlet mode, the opening degree of the air mix damper 28, and the voltage level of the blower 25 are all kept constant. Predetermined temperature G in this area
Below 0 ° C, even if there is a slight error in the temperature detected by the inside air temperature sensor 32, it does not affect the control contents of the blowout mode, the opening degree of the air mix damper 28, and the voltage level of the blower 25.

Paying attention to this point, the aspirator damper 42 is controlled to be closed when the target outlet temperature TAO is equal to or lower than the predetermined temperature G ° C. This control is performed by the air conditioning control circuit 56, which is the control means, executing the servo motor control routine shown in FIG. The control contents of this servo motor control routine will be described below.

First, at step 101, the target outlet temperature T
It is determined whether AO is G ° C (eg 0 ° C) or lower, and T
When AO ≦ G ° C., the routine proceeds to step 102, where the target opening degree SW of the servo motor 29 is set to 0%, and this routine is ended.

On the other hand, when TAO> G ° C., the routine proceeds to step 103, where it is judged if the target outlet temperature TAO is D ° C. or lower. If TAO ≦ D ° C., step 1
04, the target opening SW of the servomotor 29 is set to A%.
To end this routine. On the other hand, TAO> D
In the case of ° C, the routine proceeds to step 105, where the target opening degree SW of the servomotor 29 is calculated by the following equation (2). SW = K1 TAO + K2 (2) (K1, K2; constant) Then, the routine proceeds to step 106, where it is determined whether or not the target opening degree SW of the servo motor 29 calculated by the above equation (2) is larger than 100%. If it is determined that SW ≦ 100%,
This routine ends, but if SW> 100%,
In step 107, SW = 100% is set (because the upper limit value of SW is 100%).

After that, the air conditioning control circuit 56 outputs a command signal of the target opening SW determined by the servo motor control routine to the servo motor 29 to rotate the servo motor 29 to the target opening SW. As a result, the target outlet temperature T
When AO is equal to or lower than the predetermined temperature G ° C. (for example, immediately after the start of air conditioning operation under hot summer), the aspirator damper 42 is closed and the inlet 40 of the venturi pipe 37 is shut off.
As a result, when the temperature inside the vehicle is significantly higher than the set temperature, such as immediately after the start of air conditioning operation under hot summer, and when it is actually necessary to blow out cool air with a large air volume,
A large amount of air is secured by eliminating air leakage into the Venturi pipe 37.

When G <TAO≤D, the target opening SW of the servomotor 29 is A% and the aspirator damper 42 is opened, but the air mix damper 28 is M.
The AX / COOL state (fully closed state) is maintained (see FIG. 6). If the calculated value of the target outlet temperature TAO is accurate, the same control as in the case of TAO ≦ G described above may be performed when G <TAO ≦ D, but when the aspirator damper 42 is closed, the target control is performed. Since the detected temperature Tr of the inside air temperature sensor 32, which is the basic data for the calculation of the blowout temperature TAO, causes an error, G <TAO ≦ before the target blowout temperature TAO = E (° C.) at which the blower voltage level starts changing. In the case of D, the aspirator damper 42 is opened, and the air in the vehicle compartment is introduced into the sensor housing case 33 of the inside air temperature sensor 32 to improve the detection accuracy of the inside air temperature sensor 32.

On the other hand, in the case of TAO> D, as shown in FIG. 6, the aspirator damper 42 is maintained in the open state, and the blowing mode and the air mix damper 28 are set in accordance with the target blowing temperature TAO as in the conventional case. And the voltage level of the blower 25 are variably controlled.

In the first embodiment described above, it is determined whether or not the aspirator damper 42 is to be opened from the closed state.
Although it is performed depending on whether or not AO> G, for example, the opening timing (closing time) of the aspirator damper 42 may be controlled by a timer.

An embodiment embodying this is shown in FIGS.
2 is a second embodiment of the present invention shown in FIG. In the second embodiment, the aspirator damper 42 is driven by a dedicated servomotor (not shown) in place of the link mechanism 43 of the first embodiment, and this servomotor and air mix damper 28 are used. By controlling the servo motor 29, the opening characteristics of the aspirator damper 42 and the air mix damper 28 are controlled to be substantially the same as those in the first embodiment, as shown in FIG.

The control contents in the second embodiment will be described below with reference to the flow charts of FIGS.
First, after initialization processing in step 201, output signals of various sensors such as the inside air temperature sensor 32 and switches such as the temperature setting device 59 are read in step 202, and based on these data, in step 203, the target signal is read. Outlet temperature T
AO is calculated by the above-mentioned formula (1). Next, at step 204, the closing time Tshut of the aspirator damper 42 (hereinafter referred to as "aspirator damper closing time") is shown in FIG.
As shown in 3, it is determined according to the target outlet temperature TAO. The data shown in FIG. 13 is obtained by previously determining the relationship between the target outlet temperature TAO and the aspirator damper closing time Tshut, and this aspirator damper closing time Tshut is substantially the same as that of the first embodiment described above. Is set. The data of FIG. 13 is stored in the ROM (not shown) of the air conditioning control circuit 56 as a data map or a functional formula.

The above-mentioned aspirator damper closing time Tsh
After determining ut, the process proceeds to step 205, and it is determined whether Tshut> 0. If Tshut> 0, step 20
After proceeding to step 6 and outputting the aspirator damper closing signal to close the aspirator damper 42, in step 207 a closing time variable TASP is calculated by the following equation (3). TASP = Tshut × L (3) In this equation (3), L is the number of interrupt processing times per second of the interrupt processing program shown in FIG. This interrupt processing program subtracts the closing time variable TASP by 1 each time the interrupt processing is executed (step 301), and repeats this subtraction processing until the closing time variable TASP becomes "0". . After that, when the number of interrupt processings exceeds "TASP", the closing time variable T determined in step 301
ASP becomes negative, but in this case, step 30
When it is determined to be “YES” in step 2, the process proceeds to step 303,
The closing time variable TASP is set to "0".

In step 207 described above, the closing time variable T
When the ASP is calculated, the process proceeds to step 208 and the TASP is calculated.
It is determined whether or not ≦ 0, that is, whether or not the aspirator damper closing time has reached Tshut determined in step 204, and if “YES”, the process proceeds to step 209,
An aspirator damper release signal is output to open the aspirator damper 42, but if "NO", then
The aspirator damper 42 is kept closed.

Thereafter, in step 210, the output signals of various sensors such as the inside air temperature sensor 32 and switches such as the temperature setter 59 are read, and based on these data, the target outlet air temperature TAO is recalculated in step 211. To do. Next, the routine proceeds to step 212, where the servo motor 29 of the air mix damper 28 is based on this target outlet temperature TAO.
Target opening SW and blown air volume (voltage level of blower 25)
And the blowout mode is determined, these control data are output to each actuator in step 213. After that, returning to step 208, the above-described processing is repeated to control the air conditioning operation according to the target outlet temperature TAO.

In each of the first and second embodiments, the present invention is applied to an air mix type air conditioner for automobiles, but it is applied to a reheat type automobile air conditioner or a car cooler dedicated to cooling. You may apply. In addition, according to the present invention, various changes can be made without departing from the spirit of the invention, such as changing the installation location of the aspirator 35 as appropriate.

[0032]

As is apparent from the above description, according to the present invention, the aspirator damper is closed when the target outlet temperature is equal to or lower than the predetermined temperature (for example, immediately after the start of the air conditioning operation under hot summer). Since the primary air passage of the aspirator device is cut off, the temperature inside the vehicle compartment is significantly higher than the set temperature, for example immediately after the start of the air conditioning operation under hot summer conditions, and the cool air is actually blown out with a large air volume. When necessary, air leakage into the primary air passage can be eliminated and a large air volume can be secured.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an entire automobile air conditioner showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of an aspirator device.

FIG. 3 is a configuration diagram of a link mechanism that drives an aspirator damper.

FIG. 4 is a diagram showing a relationship between an air mix damper opening and a rotation angle of a first lever.

FIG. 5 is a diagram showing a relationship between an opening degree of an aspirator damper and a rotation angle of a first lever.

FIG. 6: Blowout mode, air mix damper opening, aspirator damper opening, blower voltage level and target blowout temperature T
Diagram showing the relationship with AO

[FIG. 7] Servo motor target opening SW and target outlet temperature TAO
Diagram showing the relationship with

FIG. 8 is a flowchart showing a servo motor control routine.

FIG. 9 is a diagram showing a relationship among a servo motor opening, an air mix damper opening, and an aspirator damper opening in the second embodiment of the present invention.

FIG. 10 is a flowchart (part 1) showing the control contents of the second embodiment.

FIG. 11 is a flowchart (part 2) showing the control contents of the second embodiment.

FIG. 12 is a flowchart showing an interrupt processing routine.

FIG. 13 is a diagram showing a relationship between an aspirator damper closing time Tshut and a target outlet temperature TAO.

[Explanation of symbols]

20 ... Blower duct, 25 ... Blower, 26 ... Evaporator, 27 ... Heater core, 28 ... Air mix damper, 2
9 ... Servo motor, 31 ... Instrument panel, 3
2 ... Inside air temperature sensor, 33 ... Sensor storage case, 34 ...
Vent hole, 35 ... Aspirator, 37 ... Venturi tube (primary air passage), 38 ... Secondary air suction nozzle (secondary air passage), 40 ... Inlet port, 41 ... Hose, 42 ... Aspirator damper, 43 ... Link mechanism, 45 ... First lever, 56
... Air conditioning control circuit (control means).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Megumi Araki 1-1-1, Showa-cho, Kariya city, Aichi prefecture, Nihon Denso Co., Ltd.

Claims (1)

[Claims] 1. A primary air passage that introduces a part of the wind that flows toward the passenger compartment inside the air conditioner for an automobile, and an air intake action is generated by the wind that flows through the primary air passage to bring the air inside the passenger compartment to the inside air temperature. In an aspirator device having a secondary air passage introduced into a sensor installation space, an aspirator damper that opens and closes the primary air passage, and the aspirator damper when the target outlet temperature of the vehicle air conditioner is a predetermined temperature or less. An aspirator device, comprising: a control means for controlling to close.