JPH02127121A - Compressor controlling device of air conditioner for automobile - Google Patents

Abstract

PURPOSE:To make it possible to use a variable capacity compressor for an air conditioner capable of independent temperature control with an automobile cabin divided into a plural number of air conditioning zones, by determining a compressor capacity using one with the lowest temperature when there is a plural number of setting for target blowoff temperature. CONSTITUTION:A microcomputer 46 calculates a target blowoff temperature T1 for the front seat and then a target blowoff temperature T2 for the rear seat after putting in output signals from various sensors 47-49 and setting apparatus 50, 51 including a cabin temperature sensor 47. Next, if T1=T2, capacity control is made of a compressor 8. That is, the capacity control is achieved by determining a target evaporator temperature under a characteristic curve for T1 and adjusting the amount of power conduction Isol to a solenoid coil 21 to assure the temperature TE of an evaporator 7 becomes a target evaporator temperature. On the other hand, if a case is judged to be T1>T2 instead of T1=T2, the capacity control of the compressor 8 is performed as described above in accordance with the target blowoff temperature T2 for the rear seat, i.e., corresponding to a lower target blowoff temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) This invention relates to a compressor control device for a vehicle air conditioner;
In particular, it relates to capacity control of variable capacity compressors.

(Prior art) An externally controlled type B variable capacity compressor is connected to an evaporator installed in an air conditioning duct to form a cooling cycle, and its discharge capacity can be changed by an external control signal. . As a cooling cycle control device using such a compressor, Japanese Patent Laid-Open No. 58-43
There is a device described in Japanese Patent No. 340, in which the discharge capacity of the compressor is controlled in stages according to the temperature inside the vehicle or the temperature of the air taken into the air conditioning duct and, for example, the temperature immediately after the evaporator. It is known that the discharge capacity of the compressor is made smaller as the vehicle interior temperature or intake air temperature is lower, or as the blowout temperature immediately after the evaporator is lower.

(Problem to be Solved by the Invention) However, the cooling cycle using such a variable capacity compressor cannot be used in a vehicle air conditioner that divides a vehicle interior into a plurality of air conditioning zones and can set the temperature for each zone. In this case, the problem is which set temperature should be used to control the compressor capacity.

Therefore, the present invention solves the above-mentioned problems in a vehicle air conditioner that uses a single variable capacity compressor to control temperature in multiple air conditioning zones, and provides a vehicle that can comfortably air condition the vehicle. An object of the present invention is to provide a compressor control device for an air conditioner.

(Means for solving the problem) As shown in FIG. 1, the gist of the invention is as follows.
A plurality of air conditioners that divide a vehicle interior into a plurality of air conditioning zones, and calculate a target temperature of the blown air blown to the plurality of air conditioning zones based on at least a set temperature for each of the plurality of air conditioning zones and a representative temperature in the vehicle interior. a target outlet temperature calculation means 110, a determination means 120 for determining the magnitude of the calculated values of the plurality of target outlet temperature calculation means, and a variable capacity compressor based on the target outlet temperature determined to be the smallest by the determination means 120. 8, and a control means 130 for controlling the capacity of 8.

(Function) Therefore, the determining means determines which of the plurality of target outlet temperatures has a lower lining, and the capacity of the variable capacity compressor is controlled by the control means in accordance with the lowest target outlet temperature, which solves the above-mentioned problem. can be achieved.

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

In FIG. 2, one embodiment of the main body of the automobile air conditioner according to the present invention is shown. and the outside air population 4 are formed in a form that is divided into two parts, and an inside/outside air switching door 5 is provided at the divided part, and the inside/outside air switching door 5 divides the air to be introduced into the main duct 2 into inside air and outside air. You get to choose.

The main blower 6 is for taking air into the main duct 2 and sending it downstream, and an evaporator 7 is provided further downstream of the main blower 6.

The evaporator 7 constitutes a cooling cycle together with a variable capacity compressor 8 and other evaporators (not shown), etc.
The air passing through this evaporator turf is cooled.

The compressor 8 is of a variable capacity type, for example, a wobble plate type, and as shown in FIG.
A drive shaft 10 connected to an engine (not shown) through a compressor body 11 is inserted into the compressor body 11, and a wobble plate 12 is connected to the drive shaft 10 through a hinge ball 13. This wobble plate 12 has a hinge ball 13 in a crank chamber 14 formed in the compressor body ll.
A piston 15 is supported swingably with respect to the drive shaft 10 using the piston 15 as a fulcrum, and is connected to the wobble plate 12.
is made to reciprocate within the cylinder bore 16 according to the swing angle. The compressor 8 also has a pressure control valve 1.
The pressure control valve 17 has a stress-responsive member 20 that moves a valve body 19 that establishes communication between the crank chamber 14 and the suction chamber 18 leading to the suction side. a solenoid 22 that moves the valve body 19 according to the amount of current ts'ot applied to the electromagnetic coil 21;
Amount of electricity to the electromagnetic coil 21! ,. , by controlling the piston 15 and the cylinder bore 16 from the outside.
The amount of blow bypass leaking into the crank chamber 14 from between the two and returning to the suction side is adjusted. However,
A variable capacity mechanism 23 is configured to change the capacity of the compressor 8 from a pressure control valve 17, etc., and the amount of current flowing through the electromagnetic coil 21 is 3°.

rises and the magnetic force of the solenoid 22 increases, the valve body 1
A force acts on the crank chamber 9 to restrict communication between the crank chamber 14 and the suction chamber 18, and the amount of blow-by gas leaking from the crank chamber 14 to the suction chamber 18 is reduced.

Therefore, the pressure inside the crank chamber 14 increases, and the force acting on the back surface of the piston 15 increases, causing the wobble plate 12 to rotate about the hinge ball 13 in a direction that reduces the swing angle, and the piston 15 The stroke of the compressor, that is, the capacity of the compressor becomes smaller.

The variable capacity mechanism 23 is not limited to the one that adjusts the amount of blow-by gas to the suction side using the pressure control valve 17 as described above, but also one that changes the number of cylinders used by the compressor, and a belt transmission device that connects the compressor and the engine. Any method that substantially changes the capacity may be used, such as a method that changes the pulley ratio of a compressor, or a method that changes the number of effective vanes in a vane type compressor.

Further, a heater core 24 is provided on the downstream side of the evaporator tough.
is arranged, and a front seat air mix door 25 is provided in front of this heater core 24.

The air mix door 25 for the front seat adjusts the amount of air that is heated by passing through the heating passage 26 in which the heater core 24 is arranged and the amount of air that passes through the bypass passage 27 that bypasses the heater core 24 depending on its opening degree. The heating passage 26 and the bypass passage 27 meet in the main air mix chamber 28 on the downstream side of each, and the air that has passed through each is mixed in the main air mix chamber 28 and then flows into the front seat space. The temperature of the air blown out is controlled. In addition, the air mix door 25 for the front seat
is connected to a first actuator 29 and is moved by this first actuator 29.

The air mixed in the main air mix chamber 28 is then divided into a front seat vent outlet 30, a front seat heat outlet 31, or a defrost outlet 32 and blown out into the front seat space in the vehicle interior, and the blowout mode can be selected. is the front seat mode door 33a
, 33b.

The rear seat blower unit 34 has a rear seat blower 36 that sucks air into a rear seat duct 35 and sends it to the downstream side. An air mix chamber 37 for seats is provided. This rear seat air mix chamber 37 and the main duct 2
are connected to each other via first and second connection passages 38a and 38b. Therefore, the first connection passage 38a is
It opens between the evaporator 7 and the heater core 24, that is, into a cold air passage 39. In addition, the second connection a path 38b
is connected to the main duct 2 on the downstream side of the heater core 24.

A rear seat air mix door 40 is provided at the portions of the first and second connection passages 38a and 38b that open into the rear seat air mix chamber 37. The amount of air introduced into the rear seat air mix chamber 37 through the connection passages 38a and 38b is adjusted according to the opening degree. This air mix door 4° for the rear seat is connected to a second actuator 41, and is moved by this second actuator 41 to change its opening degree, which allows hot air and cold air to be blown into the rear seat space. The mixture ratio is adjusted to adjust the temperature of the air in the rear seat space.

The rear seat duct 35 is divided into two parts on the downstream side of the rear seat blower 36, and the rear seat mode door 4 is connected to the divided part.
2 is provided, and this rear seat mode door 42 is connected to a rear seat mode setting lever 4 provided on a rear seat operation panel (not shown).
Moved by 3. In addition, one of the divided ducts opens into the rear seat space via the rear seat center vent outlet 44, and the other duct is further divided into left and right sides and opens into the rear seat heat outlet 29.
a.

It opens into the rear seat space via 29b, and by operating the rear seat mode door 42, it is possible to select the air outlet from which air is blown into the rear seat space.

FIG. 4 shows the aforementioned main blower 6, first actuator 29, rear seat blower 36, and second actuator 4.
1 and a schematic configuration of an electric control circuit portion for controlling the operation of the variable capacity mechanism 23 is shown, and this electric control circuit is mainly configured with a microcomputer 46.

That is, the microcomputer 46 includes a central processing unit (CPU), a read-only memory (ROM), a random access memory (RAM), and an input/output board (Il.
o) etc., and the microcomputer 46 includes a vehicle interior temperature TR from a vehicle interior temperature sensor 47 that detects the temperature inside the vehicle interior, an outside air temperature TR from an outside air temperature sensor 48 that detects the outside air temperature, Temperature TA, Cooling degree TE from the evaporator 7 or the mode sensor 49 which is installed downstream of the evaporator 7 and detects the cooling degree of the evaporator tuff as the temperature of the evaporator 7 or the temperature of the air that has passed through the evaporator 7; A first set temperature Td from the first temperature setting device 50 that sets the air conditioning temperature of the space, and a second set temperature Td from the second temperature setting device 51 that sets the air conditioning temperature of the rear seat space. is multiplexer 5
2, and is converted into a digital signal by an A/D converter 53 and input. and,
The input signal is arithmetic-processed according to a predetermined program to determine a control signal, and according to this control signal, the main processor 6 and the first
and second actuator 29, 41, rear seat blower 3
6. Each operation of the variable capacity mechanism 23 is controlled.

FIG. 5 shows an example of the control operation of the variable capacity compressor 8 by the above-mentioned microcomputer 46 as a flowchart, and the contents thereof will be explained below with reference to the same figure.

First, the microcomputer 46 starts executing the program at step 70, and proceeds to step 72 to check various sensors 47 to 49 such as the vehicle interior temperature sensor 47 and the setting device 5.
Input the output signal of 0.51. After this sensor input processing, the process proceeds to step 74, where the front seat target air outlet temperature T is calculated according to equation (11), for example.

TI = ni, -T maju ni 2・'ra-KS・Td,
...(Formula 11, where K, ~ and 3 are calculation constants, and TR
is the vehicle interior temperature, TA is the outside air temperature, and Tdl is the first set temperature.

After step 74, the process proceeds to step 76, where the rear seat target air temperature Tt is calculated, for example, according to equation (2).

T 2 = K 4・T+t+ KS・TA− &, T
d,...Equation (2) where K4~ are calculation constants, and TdO is the second set temperature.

After the processing in step 76, the process proceeds to step 78, where T,=T
! If T t = T z (YES
) proceeds to step 80, where the capacity of the compressor 8 is controlled. That is, the capacity Q of the compressor 8 is changed according to the above-mentioned front seat target air outlet temperature TI. Specifically, the target evaporator temperature is set under the characteristic curve shown in FIG. 6 for T+. Capacity control is achieved by adjusting the amount of current supplied to the electromagnetic coil 21 (3 degrees) so that the temperature T of the evaporator 8 becomes the target evaporator temperature.

Incidentally, the above-mentioned characteristic curve shown in FIG. 6 may be stored in the ROM in advance, for example.

Next, proceed to step 82 and open the front seat air mix door 2.
5 and the rear seat air mix door 40 are both set to the full cool position, and the routine proceeds to another routine via step 102.

On the other hand, if it is determined in step 78 that T,=T is not true (NO), the process proceeds to step 84, and 'rl+Tz
Compare the size of. First, if 'r+>Tg (YE
S) proceeds to step 86 and sets the rear seat target air temperature T!
In other words, the capacity of the compressor 8 is controlled in accordance with the lower target blowout temperature, but the details are basically the same as the explanation at step 80, and the explanation here will be omitted. After this step 86, step 88
Step 90 calculates the opening degree of the front seat air mix door 25 so that the front seat space has the same room temperature as the rear seat space.

In step 90, the front seat air mix door 25 is driven to the opening determined in step 88, and step 92
Proceed to. Then, in step 92, the rear seat air mix door 40 is driven to the full cool position, and the process proceeds to another routine via step 102.

In this way, while the rear seat air mix door 40 is set to the full cool position, by adjusting the opening degree of the front seat air mix door 25, both the front seat space and the rear seat space are set to the target blowing temperature T2. There is.

Next, in step 84, if it is determined that T is not > T (NO), that is, if T1 is lower than T2, the temperature in both the front and rear seats is basically set to T. Processing similar to steps 86 to 92 described above is performed in step 9.
4 to 100. However, compressor capacity IQ
is determined for T (step 94), and control is performed in which the front seat air mix door 25 in steps 88 to 92 described above is replaced with the rear seat air mix door 40 (see steps 96 to 100).

(Effects of the Invention) As described above, according to the present invention, when there are multiple target blowout temperature settings, the compressor capacity is determined using a low-temperature one. The variable capacity compressor can be used in an air conditioner that divides the interior of a vehicle into a plurality of air conditioning zones and can independently control the temperature, and the variable capacity compressor has the effect of being able to appropriately control the capacity. .

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of a variable capacity compressor control device for a vehicle air conditioner according to the present invention, FIG. 2 is a configuration diagram of a main body portion of an embodiment of a vehicle air conditioner including this control device, and FIG. 3 is a sectional view of the wobble plate type compressor used in this control device, FIG. 4 is a block diagram showing the configuration of the electric control circuit used in the above embodiment, and FIG. FIG. 6 is a flowchart showing an example of control operation, and is a characteristic diagram showing the relationship between the target blowout temperature and the target evaporator temperature used when controlling the capacity of the compressor in the present control device. 8... Variable capacity compressor, 17... Pressure control valve, 21... Electromagnetic coil, 25... Air mix door for front seat, 40... Air mix door for rear seat, 110d
~110n...Target outlet temperature calculation means, 120...
- Determination means, 130...control means.

Claims (1)

[Claims] The vehicle interior is divided into a plurality of air-conditioning zones, and the target temperature of the blown air blown to the plurality of air-conditioning zones is at least equal to a set temperature for each of the plurality of air-conditioning zones and a representative temperature inside the vehicle interior. a plurality of target air outlet temperature calculation means that calculate based on the target air outlet temperature; a determination means that determines the magnitude of the calculated values of the plurality of target air outlet temperature calculation means; and a target air outlet temperature that is determined to be the smallest by the determination means. 1. A compressor control device for a vehicle air conditioner, comprising: control means for controlling the capacity of a variable capacity compressor.