JP2654696B2 - Control unit for automotive air conditioner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle, and more particularly, to a control device for controlling the blowing capacity of the air conditioner.

Automatic as a common parameter for controlling the (prior art) air conditioners, for example, a target air temperature X _M is calculated based on the vehicle interior outside temperature and the set temperature or the like, the rotation of the blower in accordance with the magnitude of the signal The control technique is widely known, for example, in Japanese Patent Publication No. 59-19849. This is because, as shown in FIG. 4, when the signal X _M is in the predetermined intermediate region is the rotational speed of the blower and low speed, the rotational speed of the blower when the signal X _M does not belong to the intermediate region, until reaching the high speed range is intended to X _M was made to gradually set larger as deviated from the intermediate zone.

(Problems to be Solved by the Invention) However, when the control parameter (target blow-off temperature) is in a predetermined intermediate range, the capacity of the blower becomes low. For example, the temperature setter is operated to change the temperature in the vehicle compartment. Even when you do, there is a case that it stays in without leaving the middle area,
In such a case, there is no change in the blowing capacity, and it is not possible to obtain a feeling of lowering the room temperature in accordance with the change in the set temperature.
In addition, when the blowing capacity remains in the low rotation range, only the change of the blown air temperature is required, so that there is a disadvantage that it takes time to reach the changed set temperature in the vehicle interior.

Therefore, in the present invention, when the set temperature is changed, the above-mentioned drawback is eliminated, and a change in the temperature-controlled air corresponding to the change can be sensed from the blown air amount, and the vehicle interior that reaches the set temperature is adjusted. Increase the speed of temperature change,
It is an object of the present invention to provide a control device for an air conditioner for a vehicle, which has improved control performance as a whole.

(Means for Solving the Problems) However, as the gist of the present invention, as shown in FIG. 1, air is sucked into an air-conditioning duct by rotation of a blower 7, and air whose temperature is adjusted is also removed. In an automotive air conditioner to be supplied to a vehicle interior, a temperature setting device 37 for setting the temperature in the vehicle interior, a heat load detecting means 100 for detecting a factor related to a heat load in the vehicle interior, the temperature setting device 37 and the heat Control parameter calculation means for calculating control parameters for controlling the air conditioner based on the output of the load detection means 100
If the control parameter calculated by the control parameter calculation means 200 belongs to a predetermined intermediate range, the air volume becomes low, and if the control parameter does not belong to the intermediate range, it gradually increases as it deviates from the intermediate range until it reaches a high air volume. A first air volume calculating means 300 for calculating an air volume to be a small air volume, and a minimum air volume required at the set temperature based on only the set temperature set by the temperature setting device 37. A second air flow rate calculating means 400 for performing the operation, and the first and second air flow rate calculating means 300 and 400
Selecting means 50 for selecting the larger one of the air volumes calculated in
0 and a blower drive control means 600 for controlling the blower 7 so as to obtain the air volume selected by the selection means 500.

(Operation) Therefore, even if the air volume calculated by the first air volume calculation unit 300 based on the control parameter obtained by the control parameter calculation unit 200 from the set temperature and the vehicle interior temperature is in the low air volume range, the predetermined setting is performed. If the air volume required in advance by the second air volume calculation means 400 at a higher temperature is larger, the larger air volume is selected by the selection device 500, and the temperature-controlled air is supplied into the vehicle compartment. In addition, the amount of air supplied to the passenger compartment can be changed sensitively by changing the set temperature, and the sense of temperature change and the speed of change in room temperature can be increased. Therefore, the above object can be achieved.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 2, the air conditioner for an automobile is an air conditioning duct 1
An intake switching device 2 is provided at the most upstream side of the intake air supply device. In the intake switching device 2, an intake door 5 is disposed at a portion where an inside air inlet 3 and an outside air inlet 4 are separated, and the intake door 5 is operated by an actuator 6. Thus, the air introduced into the air conditioning duct 1 can be selected from inside air and outside air.

The blower 7 sucks air into the air-conditioning duct 1 and blows the air downstream. An evaporator 8 and a heater core 9 are provided behind the blower 7.

The evaporator 8 includes a compressor 10, a condenser 11,
The liquid tank 12 and the expansion valve 13 are connected by piping to form a cooling cycle, and the compressor 10 is connected to an automobile engine 14 via an electromagnetic clutch 15 and is controlled to be turned on and off by intermittently operating the electromagnetic clutch 15. You. Further, the heater core 9 is
Cooling water circulates to heat the air.

An air mix door 16 is provided in front of the heater core 9, and the opening degree of the air mix door 16 is adjusted by an actuator 17 so that the amount of air passing through the heater core 9 and air bypassing the heater core 9 is adjusted. Is changed, so that the temperature of the blown air is controlled.

The downstream side of the air-conditioning duct 1 is divided into a defrost outlet 18, a vent outlet 19 and a heat outlet 20 and opens to the vehicle interior 21. The divided portions are the mode doors 22a and 22a.
b, and the mode doors 22a and 22b are
By operating at 23, a desired blowing mode can be obtained.

25 is a vehicle interior temperature sensor that detects the temperature Tr of the air in the vehicle interior, 26 is a solar radiation sensor that detects the amount of solar radiation Qs, and 27 is the outside air temperature
An outside air temperature sensor for detecting Ta, these sensors constitute a heat load detecting means, and these signals are converted by an A / D converter 30 through a multiplexer 29 for selecting a signal.
, Where it is converted to a digital signal and input to the microcomputer 31. Further, an output signal from the operation panel 32 is input to the microcomputer 31.

The operation panel 32 has an A / C switch 33 for operating the compressor 10 and an ECON switch 34 for economically controlling the compressor.Each air conditioner switches to an automatic control mode when any of these switches is pressed. enter. The operation panel 32 includes an OFF switch for stopping the operation of each air conditioner, a DEF switch 36 for setting the blowing mode to the defrost mode, and a temperature setting device for setting a set temperature Tset in the vehicle compartment.
37, blowing capacity setting device 38 for setting the blowing capacity, blowing mode setting device 3 for setting the blowing mode other than the defrost mode
9, equipped with an inhalation mode setting device 40 that sets the inhalation mode,
The set temperature, the blowing capacity, the blowing mode, and the suction mode are displayed on the display unit 42 controlled by the microcomputer 31 via the display circuit 41.

The microcomputer 31 is a central processing unit (not shown)
CPU, read-only memory ROM, random access memory RA
M, a well-known device having input / output port I / O, etc., based on the various input signals described above, the actuator 6,
17, 23, a control signal is output to the motor of the blower 7 and the electromagnetic clutch 15 via the drive circuits 43a to 43e, respectively,
Drive control of 5,16,22a, 22b, rotation control of blower 7, and ON / OFF control of electromagnetic clutch 15 are performed.

FIG. 3 shows an example of a control routine of the blower control by the microcomputer 31 described above as a flowchart. The microcomputer 31 starts executing this program from step 50, and in the next step 52, executes each of the heat load detecting means. The signals Tr, Qs, Ta and the set temperature Tset set by the temperature setter 37 are input. Then, in the next step 54, a common parameter for controlling each air conditioner is calculated as a total signal T by the equation (1).

T = A · Tr + B · Ta + C · Qs−D · Tset + E (1) where A to E represent arithmetic constants, and the value of T itself is small in winter, for example, because the outside air temperature Ta is low, and the set temperature Tset The smaller is the larger.

After the calculation of the total signal T, the process proceeds to step 56, where the first air volume B _A is calculated from a predetermined characteristic pattern based on the total signal T. The air volume characteristics used here are the same as those in the conventional art. When the total signal T belongs to a predetermined intermediate region, the air volume is set to a low air volume. The air volume is gradually increased as it deviates.

In the next step 58, the second air volume Bset is calculated based only on the set temperature Tset. In setting the Bset, a characteristic pattern of a minimum required air flow which is previously tested and set to obtain a thermal sensation under the set temperature Tset is used. Normally, the temperature is set based on the most comfortable temperature of 25 ° C, so the set temperature is around 25 ° C (from 23 ° C to 27 ° C in this embodiment)
, The minimum required airflow is low, and if it deviates from around 25 ° C., the minimum required airflow gradually increases as it deviates. In addition, in this Example, it is LOW within the range of 23 ° C to 27 ° C, and increases from LOW to MID (medium) within the range of 23 ° C to 19 ° C and 27 ° C to 31 ° C. High air flow (MAX HI or AUTO HI) is supplied.

After the two types of air volume B _A and B set are calculated, the magnitude of B _A and B set are compared in step 60, and if B _A > B set, the air volume of B _A is obtained in step 62. The drive of the blower 7 is controlled as described above, and if B _A ≦ Bset, the drive of the blower 7 is controlled in step 64 so as to obtain the blow amount of Bset.

Therefore, for example, when the vehicle interior temperature is in a stable state approaching the set temperature, the air volume B _A calculated in step 56 is in a low air volume range, and even if the set temperature Tset is changed by a predetermined amount.
In the above-mentioned case where the set temperature Tset deviates from around 25 ° C. (for example, 23 ° C. or less or 27 ° C. or more), there is a case where B _A does not fall out of the low air volume range and the low air volume is calculated. Air volume Bset is larger than B _A ,
The blower is controlled by this Bset, the air volume is increased, and the occupant can know the temperature control change in the vehicle interior due to the change in the set temperature from the air volume through the sensation.

If the temperature setting device is changed, the blowout temperature is changed. Therefore, the speed of the temperature control change as well as the bodily sensation can be increased by changing both the air blowing amounts.

(Effects of the Invention) As described above, according to the present invention, even if the air volume calculated based on the heat load in the vehicle interior and the set temperature is in a low air volume range, it is necessary that the air volume be minimum at the set temperature. If the air volume is larger than the low air volume, the temperature-controlled air can be supplied to the vehicle interior with the large air volume. By changing the air flow rate, the speed at which the temperature in the vehicle compartment changes to the set temperature can be increased, and the control performance can be improved as a whole.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing the present invention, FIG. 2 is a block diagram showing an automotive air conditioner according to the present invention, FIG. 3 is a flowchart showing an example of a control routine of a blower control by a microcomputer used in the above. FIG. 4 is a characteristic diagram showing air volume characteristics. 7 blower, 37 temperature setting device, 100 heat load detecting means, 200 control parameter calculating means, 300 first air flow calculating means, 400 second air flow calculating means, 500 ... Selecting means, 600 ... Blower drive control means.

Claims (1)

(57) [Claims] 1. An air conditioner for an automobile, which sucks air into an air conditioning duct by rotation of a blower and supplies temperature-controlled air to a vehicle compartment, comprising: a temperature setting device for setting a temperature in the vehicle compartment; Heat load detecting means for detecting a factor related to the heat load of the above; control parameter calculating means for calculating a control parameter for controlling an air conditioner based on outputs of the temperature setting device and the heat load detecting means; When the control parameter calculated by the parameter calculation means belongs to a predetermined intermediate range, the air volume is set to be low, and when the control parameter is not belonging to the intermediate range, the air volume is set to gradually increase as the air flow deviates from the intermediate range up to the high air volume. A first air volume calculating means for calculating the temperature, based only on the set temperature set by the temperature setting device,
A second air volume calculating means for calculating a minimum required air volume at the set temperature; a selecting means for selecting a larger one of the air volumes calculated by the first and second air volume calculating means; A control device for an air conditioner for a vehicle, comprising: blower drive control means for driving and controlling the blower so as to obtain the air volume selected by the selection means.