JPS5945212A - Air conditioner device for car - Google Patents

Abstract

PURPOSE:To enable air conditioning without giving any uncomfortableness to passengers in a device that automatically switches a blowoff port vertically depending upon the degree of opening of an air mix door by computing the degree of opening of the door assuming the atmospheric temperature as the intake air temperature during air conditioning operation with a conpressor in halt. CONSTITUTION:A desired blowoff temperature TO is computed from the output of atmospheric and room temperature sensor 17 and 19 and the output of a room temperature setting device 18 by using an arithmetic circuit 22 and the degree X of opening of an air mix door is determined based on the temperature TO by using an arithmetic circuit 23. An actuator 27 for actuating the air mix door is controlled based on the deviation of the degree of opening X from the output X' of a degree of opening sensor 12 and actuators 30 and 31 for actuating the respective blowoff port doors are controlled according to the mode determined depending upon the degree of opening X. In this case, an arithmetic circuit 33 that is provided to estimate the air temperature TIN at the evaporator exit side computes the air temperature TIN by sucking the atmospheric temperature as the intake air temperature during air conditioning operation with a compressor in halt.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an automatic air conditioner that lowers the air outlet depending on the opening degree of the air mix door. During off operation or when the compressor is off.

The present invention relates to a vehicle air conditioner that prevents the discomfort of riding due to the air outlet being cut when the humidity of a blown air bag changes significantly due to an outside air switching operation.

Recently, many vehicles are equipped with a near conditioner (hereinafter referred to as an "air conditioning system") that adjusts the temperature inside the vehicle to a set temperature. FIG. 1 shows a schematic configuration of a conventional dual-use air conditioner.

In the figure, a proa fan 2 rotated by a motor 1
The empty space is taken in from the 9 sudden inlet.

After being cooled by the evaporator 4, a part of the air is heated by the heater core 6 depending on the opening degree of the air mix door 5, and then mixed with the unheated part to obtain air at the desired humidity. It's bubbling out. 71.81.9
1 is an actuator 71a for operating the blowing rod door.

81a and 91a are solenoid pulps that operate actuators 71, 81 and 91, respectively; 6IO is a compressor; ]] Main air mix door operating actuator; 120-piece mix door opening sensor; 14 and ]5
is a solenoid valve that operates the actuator 11,
14 is a solenoid valve that guides the actuator 11 to the 9 pressure of the engine intake pipe, and 15 is a solenoid valve that opens the actuator 11 to a large receiving pressure.Empty cartridges taken in by the proafan 2 are switched by the outside air switching door 16. The air intake lever (
(not shown)-fc and turn the lever 1 ('Rt; 8
When the door 16 is set to the 11 position, the door 16 becomes the position shown in the diagram, and the outside air is brought in from A, and the power is input. The air conditioning operation of the air conditioning system described above is controlled by an air conditioning control circuit as shown in Figure 2. 17 is an outside temperature sensor, 18 is a room vortex setting gain, 19d is a room temperature 1 sensor, 20 is a suction temperature sensor, 21 is an analog-to-digital (A/D) converter that digitizes these six outputs, 36 is a calculation section, which includes a calculation circuit 22 composed of a microcomputer, etc., which calculates the target blowout temperature, and a microcomputer, which calculates the opening degree of the air mix door.
') The configured opening degree calculation n1 circuit 23 and the opening degree calculation circuit 2
A comparator 24 that compares the opening IFX output from the air mix door opening sensor 12 with the opening X' detected by the air mix door opening sensor 12, and the opening degree output from the opening calculation circuit 23 determine the blowout mode. Comparison 1: The suction temperature of the empty package at the river disconnection circuit 28 and the evaporator inlet 11411 is 1 degree Tin at the evaporator outlet fiIll K.
The calculation circuit 32 is configured to perform estimation based on a flowchart as shown in FIG.

25 is a digital/analog (1)/A)* converter.

26 is an actuator drive circuit that outputs an actuator drive signal based on the output of the comparator 24; 27 is an actuator for operating the air mix door that is operated by the drive signal from the actuator drive circuit 26; 111: ¥1
This corresponds to the actuator 11 of . Actuator ii
No: Actuator drive 1←1 circuit that outputs the heavy j1 signal, 30.31 is the actuator drive [Blowout rod operation IJ+ 1 operated by the thought signal from 01 road 29
1 actuator, actuator 71' in FIG.
It corresponds to 81.

Calculate the volumetric outlet temperature 1
Based on the temperature 1'PTo set by 8, the external body i￥1TA not detected by the outside temperature sensor 17, and the 1 room circle #1 degree TR detected by the room temperature sensor 19, the following formula is calculated. Accordingly, the target j speech bubble 'b 11' To ka performance 1-sa).

To =A"l'FTc++13-TA +C('l'
Pro-'l'R)+D-J'(TPI・.-1'R
) dt+E In the above formula, the number of feet is A, 13. C, D, and E are stored in advance in the internal memory. When the target blowout control 'o is increased in this way, the opening: FT calculating circuit 23 calculates the air mix door's I;1ffi U.
X is determined. Here, the target blowing temperature T is set in advance. , the relationship between the air mix door opening degree X and the air-q temperature TIN is stored as shown in FIG. Ru. For example, the air mix door opening degree for the target outlet temperature To K is the suction temperature T.
When DJ is 20°C, it is xl, when TIN is 10°C, it is X2°, and when TDl is 0°C, it is X3. Here, it is a value calculated from the flowchart shown in Fig. 4 from the suction temperature T NH, the compressor on/off, and the suction temperature @T NK. temperature.

When the air mix door opening degree is determined in this way, the air outlet mode is determined from the relationship between the air mix door opening degree and the outlet mode, which is stored in advance, as shown in FIG. 5. There are two modes: HEAT mode, which blows warm air from the foot air outlet, and VENT mode, which blows out dehumidified air at an appropriate temperature from the instrument air outlet.
is shown.

The near-mix door opening number X obtained in this way is compared with the near-mix door opening number X' detected by the near-mix door opening sensor 12 and the comparator 24r. In this case, a drive signal is output from the actuator drive circuit 26 and the actuator 27 does not operate.

Specifically, solenoid valves 14 and 15 in FIG.
is activated, actuating the actuator 11 to change the opening degree of the air mix door 5.

Further, the air outlet is determined by operating the drive signal from the actuator and drive circuit 29 and operating the f11!7ζ output rod door operating actuator 30.31 based on the mode determined as explained in n9 above. . Specifically, the solenoid pulps 71a, 81a in FIG. 1 are actuated, and as a result, the actuators 71, 81'! 5 to operate the blowout mode door 7.8.

In the above air conditioner, &:I:', as shown in Figure 3, when the suction temperature changes, the opening of the air mix door increases, and the blowout low mode is established in conjunction with the change in the opening of the air mix door. Due to the aging process, when the estimated mud ml at the evaporator outlet 1Ill changes, the compressor turns on.

When switching off or switching between inside and outside air, hot air may blow out of the instrument outlet, or cold air may blow out from under your feet. This point will be explained in detail using FIGS. 6 and 7.

First, in Fig. 6, when the compressor is operated with internal circulation at 25°C, the coffin foot humidity TiN at the evaporator outlet 11+ will be 5°C by the calculation in Fig. 4, and for the target blowout temperature To) In LIDAT mode, gentle warm air is blown out from under my feet.

When the compressor is turned off at this time, the estimated temperature TIN on the evaporator outlet side reaches 25°C, so the blowout mode with respect to the target blowout pressure To is V E N 'l
'When the mode changes, warm air of the same temperature changes from the foot outlet in the shelter to the instrument outlet, causing discomfort to the crew.'Furthermore, the compressor is turned on from completely off. However, the same discomfort was felt all the time.As shown in Figure 7, a similar problem occurs when the outside temperature is, for example, 5℃ and the compressor is completely turned off. Jogyo Naka Takumi'; Li fJi'
This occurs when switching to +V (25℃) or when switching from Enyu to External Pump. At this time, the estimated temperature on the evaporator outlet side j is 25''C, and the opening degree of the air mix door relative to the target blowout temperature, degree 'J'o VC, is II OT (from jlJi to co, t,
, when moving to the t+ side, the blowout mode is also switched from Il+ mode to V IJ N'J'' mode in conjunction with the sound, and the wind that had been blowing out from the feet until it comes out from the instrument outlet. , 'out.

This will cause discomfort to the passengers.

The non-invention was made in view of the above points, and selectively injects the outside or inside of the vehicle.

Based on the outside temperature, the flow rate inside the vehicle, and the one-car foot groove, the target air outlet i altitude of air outlet j mixture is calculated from the required calculation formula, and based on the target air outlet mA IJIo and the temperature of the intake air. At Takumi, an air conditioning system blows hot or cold air at the target blowout temperature from a predetermined blowout port according to the opening degree of the air mix door to adjust the temperature inside the vehicle to the desired temperature.

When the compressor is turned on and off during internal circulation 1
In order to eliminate the discomfort caused by the change in air or cold air outlet when the air intake method is switched from inside to outside air when the compressor is off, the compressor is turned off and the air inside the vehicle is sucked into the inside air. When the circulating air conditioning is in operation, the temperature of the air drawn in from outside is used to control the opening of the air mix door and, accordingly, the outlet.

The present invention will be explained below based on all the drawings.

FIG. 8 is a block diagram of an embodiment of an air conditioning control circuit for an air conditioner according to the present invention, in which the same reference numerals as in FIG. 2 indicate the same components.

In this embodiment, 33 is an arithmetic circuit that estimates the temperature TiN of the empty cartridge on the evaporator outlet side from the air suction temperature TiN on the evaporator inlet side, and this arithmetic circuit 33 operates as shown in FIG. This is different from the conventional arithmetic circuit 32 shown in FIG.

Therefore, to explain the operation of the pre-fishing p1 path 33 from Figure 9, first, it is determined whether the compressor is on or not, and if it is on, the suction humidity III and N are estimated as before, and the compressor is turned off. Then, t is the next υζ forced input switch (91
Switch to cycle) 1 (Turns off whether EC8W is on or not. As a result, 9t LI within 1 forced
Y-included switch it E C8W is not turned on.
1 is the same as the conventional day 1, and the suction humidity IXtTi is
If it is turned on, the output range of the external sensor 17 is used as the suction temperature.

Now, assuming that the outside temperature is 15°C and the compressor is operating with internal air circulation at 25°C, the 919th operation will change the estimated temperature Ti of the evaporator Llj O (1iiiI).
N is 5°C, and I- for target air humidity TO.
IE to III mode, the so-called crystal wind is blowing out from under my feet. At this time, when the compressor is turned off, the estimated temperatures IJI and N are set to 15°C, which is the outside temperature.
The opening degree of the air mix door that is controlled by the circuit 22 moves slightly, but the opening degree (indicated by the broken line) for TiN=25°C in Fig. 6 is on the COL'D side. does not move, therefore the blowout mode fd
l → Leave the EAT mode at - and the warm air will continue to blow out from the outlet at your feet. Similarly, as shown in Figure 11,
For example, when the outer groove is heated at 5℃ with the compressor turned off and outside air is introduced, if you switch to internal circulation, the T
Since iN=5° C., the opening degree of the air mix door does not change, and therefore the blowout mode is set to 1) FAT mode 1, so hot air continues to be blown out from the footwell outlet.

In this way, when the compressor is turned on or off during cooling with inside air intake, or when switching between outside air intake and inside air circulation with the compressor turned off, the estimated temperature of the evaporator outlet shaft is Since the outside air temperature is used, the airflow mode does not change easily even if the opening degree of the air mix door changes, and there is no cold air blowing out from the feet or hot air blowing out from the instrument air outlet, and the air flow mode is less likely to change even if the opening degree of the air mix door changes. Discomfort and strain can be avoided.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of the air conditioner 4-1, and Figure 2 is the air conditioner shown in Figure 1. Conventional air conditioning control circuit 1 which controls the air of the il device, air mix door opening 1'lj Th, 3' of the air conditioning control circuit shown in Figure 3 and Figure 2.
A diagram showing the 1Wfl relation between the air mix door once and the target blowout of 7 mm and 11 degrees, which is the basis of the calculation by L times 1 shift 1. Axis 111 (-Act on foot temperature calculation aid 1:
KtlJfv flowchart, 5th and 4th (d 7
ii”, 1-Diagram showing the relationship between the air mix door opening at the empty IM4 position and 1y'+ (exit upper door shown in Figure 1),
Figure 6 and Figure 71 ¥1 are air conditioning controls shown in Figure 12 ()
1st road tζ and tJ air mix door opening and blowing hot stone. Suspicious 9
1¥1 is the sky 4 shown in Figure 8;'a! 1tfl tr
il mouth + road (neno (porator exit t (11
Flowchart of calculation operation to Q to 1st path, 1st
0 and 11 are diagrams showing the relationship between the air mix door opening degree and the target blowout temperature in the air conditioning control circuit shown in FIG. 8. l...Motor, 2...Proa fan, 4...Evaporator, 5...Air mix door, 6...Heater core, 7, 8.9...Blower outlet, JO...Compressor, 11, 27.3 (1, 31, 71, 81...actuator, 12, 17, 19, 20... sensor, 14.15... solenoid valve. 16... door, 18... room temperature Setting device, 21.25
Converter, 22.23, 32.33 Arithmetic circuit, 24 Comparator, 26.29 Drive circuit, 28
...-Comparative judgment 1 judgment circuit. Patent Applicant: Nissan Motor Co., Ltd. Representative Patent Attorney Hiroshi Suzuki Figure 3 Air Mig entrance door Figure 10 Air mix door M & Figure 11 Air mix, door Bn degree

Claims (1)

[Claims] By selectively inhaling air from outside the vehicle or inside the vehicle, the external temperature and
A-indoor mud black and set 5 n τlI, i! The target blowout temperature of the blowout air is calculated from a set of roasters with a predetermined calorific value balance based on the temperature of the blowout air of the one frame and the temperature of the suction air raid. l
5) The viscosity of the air outlet from the outlet determined in advance to the opening degree of the air mix door. Wind! When the compressor is off and the air conditioner is operating by sucking air inside the cabin, the outside air + = The humidity at the tip of the suction is the function of the air mix door opening above? -4 II '14. A vehicle adjustment device characterized by being equipped with a means.