JPH0232487Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a vehicle air conditioner, and more specifically, to a vehicle air conditioner with improved air flow control.

(Prior Art) Conventional air blowing volume control for vehicle air conditioners includes, for example, one in which the maximum air blowing volume is limited depending on the engine cooling water temperature, as disclosed in Japanese Patent Laid-Open No. 56-138639, As disclosed in Japanese Unexamined Patent Publication No. 59-40918, there is a system in which the maximum air volume is controlled based on the calculated value of the total heat load.

In the former case, the amount of air blown at startup reaches its maximum during intermediate seasons such as spring and autumn, causing discomfort.

Furthermore, in the case of the latter, since the amount of air blown reaches its maximum when the outside air is very low, there is a problem that the engine cooling water temperature is still low, especially at startup, and the interior of the vehicle cannot be warmed.

(Purpose of the invention) The present invention has been made in view of the above, and it is an object of the present invention to provide an air conditioner for a vehicle that eliminates the above-mentioned problems and eliminates discomfort when starting up in the middle of the season.

(Structure of the invention) FIG. 1 is a functional block diagram showing the structure of the invention.

Blow air from the blower 15 is supplied to the vehicle compartment 34 via the air conditioning means 1. The air conditioning means 1 includes, for example, a cooler that cools the air blown from the blower 15;
It consists of a heater installed between the cooler and the passenger compartment, and a mix door that adjusts the ratio between the amount of air that passes through the cooler and the amount of air that passes through the heater.

On the other hand, the temperature inside the vehicle compartment 34 is determined by the inside air temperature detection means 2.
Detected by. The detection output of the inside air temperature detection means 2 and the output of the temperature setting device 40 are supplied to the control means 4, and the blower 1 is controlled by a signal related to the difference between the detection output of the inside air temperature detection means 2 and the output of the temperature setting device 40.
5 and the air conditioning means 1 are controlled.

On the other hand, in the present invention, the outside air temperature is detected by the outside air temperature detection means 3. The determining means 5 determines whether the air conditioning means 1 is in a heating mode in which the air blown from the blower 15 is heated. This determination may be made, for example, from the output of the control means 4 that controls the air conditioning means 1.

When the detected outside air temperature is within a certain range higher than a predetermined temperature and the determination means 5 determines that the air conditioning means 1 is in heating mode, the maximum value corresponding to the detection output of the outside air temperature detection means 3 is determined. The limiter 6 limits the blower control signal of the control means 4 to limit the maximum value of the blower airflow in accordance with the detected outside air temperature.

(Example of idea) The present invention will be explained below with reference to examples.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention.

11 is an air conditioner main body, and 12 is a control device consisting of a microcomputer that controls the air conditioner main body 11.

The air conditioner main body 11 includes, from the upstream side of the duct 13, an inside/outside air ratio adjustment door 14, a blower 15, an evaporator 16, a mixer door 17, and a heater core 1.
8 are arranged in sequence, and mode switching doors 19 and 20 are provided on the most downstream side.

The inside/outside air ratio adjustment door 14 is controlled by a motor actuator 21 to adjust the ratio between the outside air amount and the recirculated interior air amount in the intake air, and the intake air is passed through the outside air ratio adjustment door 14 by the blower 15.
The liquid is sucked into the duct 13 through the duct 13. The evaporator 16 includes a compressor 22 that compresses and circulates the refrigerant, a condenser 23, and a receiver tank 24.
The compressor 22 and the expansion valve 25 constitute a cooler 26, and the compressor 22 is driven by a pulley 27 to which the rotation of the output shaft of the on-vehicle internal combustion engine is transmitted.
The rotational force from pulley 27 is applied to magnetic clutch 2.
8. The intake air drawn in by the blower 15 is cooled by passing through the evaporator 16 when the cooler 26 is operating.

The heater core 18 receives cooling water for the internal combustion engine mounted on the vehicle and functions as a heater. Evaporator 16
The ratio of the intake air cooled by the heater core 18 passing through the heater core 18 is controlled by the opening degree of the mix door 17. The mix door 17 is driven by a motor actuator 30.

The mode switching doors 19 and 20 select the vent outlet 31, the defrost outlet 32, and the heat outlet 33 and switch to blow out conditioned air into the vehicle interior 34. The mode switching doors 19 and 20 are driven by a motor actuator 35.

Inside air temperature detection sensor 3 that detects the temperature inside the vehicle interior
6. A solar radiation amount detection sensor 37 that detects the amount of solar radiation, an evaporator outlet air temperature detection sensor 38 that detects the temperature of the evaporator outlet air, that is, the temperature of point A, an outside air temperature detection sensor 39 that detects the outside air temperature, and a setting of the cabin temperature. Setting device 40, mix door 17
A potentiometer 41 is provided to detect the opening degree of the opening. Output of inside air temperature detection sensor 36, output of solar radiation detection sensor 37, output of evaporator outlet air temperature detection sensor 38, outside air temperature detection sensor 39
, the setting output of the setting device 40 , and the output of the potentiometer 41 are supplied to an A/D converter (hereinafter referred to as ADC) 43 via a multiplexer (not shown), where they are converted into digital data and sent to the control device 12 .
It is supplied to

The control device 12 basically includes a CPU _12-1 , a ROM _12-2 for storing programs, a RAM _12-3 for storing data, an input port _12-4 , and an output port _12-5 .

The input port _12-4 reads digital data from the ADC 43 according to the program stored in the ROM _12-2 , and the CPU 1 reads the digital data according to the program stored in the ROM _12-2 .
The data processed and calculated in _2-1 is output port 1.
_2-5 to drive circuits 46-50.

The operation of one embodiment of the present invention is shown in FIGS. 3 and 4 according to the program stored in the ROM _12-2 .
This will be explained according to the diagram.

When the program is started, initial settings are made (step a), and then digital data from the ADC 43 is read through the input port _12-4 ,
Stored in a predetermined area of _RAM12-3 , T=
The combined data of T _r +K ₁ T _S +K ₂ T _a +K ₃ T _E −K ₄ T _D +K ₅ is calculated (step b), where T _r is the detection output of the inside air temperature detection sensor 36, and T _S is The detection output of the solar radiation detection sensor 37, T _a is the detection output of the outside air temperature detection sensor 39, T _E is the detection output of the evaporator outlet air temperature detection sensor 38, T _D is the setting output of the setting device 40, K ₁ to K ₅ is a constant, and the total data T corresponds to a value obtained by correcting the difference between the vehicle interior temperature and the temperature set by the setting device 40 using the amount of solar radiation, the outside air temperature, and the evaporator output air temperature.

Following step b, air blowing amount control is performed to control the rotational speed of the blower 15 via the drive circuit 47 based on the total data T (step c). Next, the motor actuator 21 is controlled through the drive circuit 46 based on the overall data T to control the opening degree of the inside/outside air ratio adjustment door 14, and the drive circuit 4
9 to control the motor actuator 30 to control the opening degree of the mixer door 17, and to control the energization state of the magnetic clutch 28 via the drive circuit 48 to control the operating timing and operating rate of the cooler 26. A known temperature control is performed (step d). Next, based on the output T _E of the evaporator outlet air temperature detection sensor 38 and data corresponding to the opening degree of the mixer door 17, the motor actuator 35 is controlled to drive the mode switching doors 19 and 20 through the drive circuit 50. , a known mode control is performed to select the air outlet (step e). Step b is executed following step e.

In one embodiment of the present invention, step c is the fourth step.
As shown in the figure, following step b, it is determined from the combined data T whether the mode is heating mode or not, that is, the combined data T
It is checked whether or not is less than α (step c ₁ ).
When the total data T is less than α, the heating mode is determined, and when the total data T is equal to or greater than α, the cooling mode is determined.

When it is determined in step _c1 that the mode is heating mode, the maximum air flow rate is calculated according to an arithmetic expression corresponding to a predetermined pattern in accordance with the outside air temperature T _a , and is temporarily stored in a predetermined storage area of the RAM _12-3 . (Step _c2 ). The maximum air flow rate pattern corresponding to the outside air temperature T _a is as shown by the solid line within the frame of step _c2 . For example, when the outside air temperature T _a is -T _a2 (for example, -5°C) or higher, the conventional The maximum airflow is the same as the maximum airflow H _i in the case of airflow control, and the outside temperature T _a is −T _a1 (for example, −20℃)
(-T _a1 <-T _a2 ), the maximum air flow is M _e
(M _e <H _i ), and when the outside air temperature T _a is less than −T _a2 and higher than −T _a1 , the pattern is such that the maximum air flow rate is decreased in proportion to the decrease in the outside air temperature.

Following step _c2 , as in the case of conventional airflow rate control, a calculation is performed in which the airflow rate corresponds to a predetermined pattern (the pattern shown by the solid line within the frame of step _c3 ) corresponding to the total data T. The amount of air blown as a result of this calculation is compared with the maximum amount of air blown stored in step _c2 , and the blower 15 is controlled to the amount of air that is the smaller value (step _c3 ). In other words, in this case, the total data T
is the case where T<α, and as shown in the frame of step _C3 , the maximum air flow rate is limited as shown by the dashed line in accordance with the outside air temperature T _a .

Also, in step _C1 , the total data T is T<
If not α, step C ₁ instead of heating mode
Following this, step _C3 is executed. In this case, it is the same as in the case of conventional air blowing amount control, and the control is performed as shown in the pattern shown by the solid line within the frame of step _C3 , and the maximum air blowing amount is not limited.

Further, in step _C2 , a pattern is formed so that the maximum air flow rate for the outside air temperature T _a is further limited for temperatures above the outside air temperature T _a2 (for example, 5° C.), as in the above case. In this way, the amount of air blown during startup in the middle of the season will not be large and cause discomfort.

This is because even if there is a certain degree of difference between the interior air temperature of the vehicle interior and the set temperature during mid-seasons such as spring and autumn, it will be more comfortable if the air volume is not as strong as in summer or winter.

Further, a step similar to step _C2 may be provided between step _C1 and step _C3 to limit the maximum airflow amount even in the cooling mode.

(Effect of the invention) As explained above, according to the invention, when the outside air temperature is within a certain range higher than a predetermined temperature,
In addition, since the maximum amount of air blown during heating is limited in accordance with the outside temperature, it is possible to eliminate the discomfort caused by too large an amount of air blown at startup in the middle of the season.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing the configuration of the present invention.
FIG. 2 is a block diagram showing one embodiment of the present invention. 3 and 4 are flowcharts for explaining the operation of the present invention. 1...Air conditioning means, 2...Inside air temperature detection means, 3
...Outside temperature detection means, 4...Control means, 5...
Determination means, 6... Limiting means, 15... Blower, 3
4...Car compartment.

Claims (1)

[Scope of utility model registration request] A blower, an air conditioning means provided between the blower and the passenger compartment, a temperature setting device, an inside temperature detection means for detecting the inside temperature of the passenger compartment, and a difference between the output of the temperature setting device and the output of the inside air temperature detection means. In a vehicle air conditioner, the vehicle air conditioner is equipped with a control means for controlling at least the amount of air blown by the blower based on a signal related to the air conditioner, and an outside temperature detection means for detecting the outside air temperature, and a determination that the air conditioning means is in a heating mode. a determining means; and when the detected outside air temperature is within a certain range higher than a predetermined temperature and the determining means determines that the heating mode is set, the maximum value of the air blow rate of the blower corresponds to the output of the outside air temperature detecting means. An air conditioner for a vehicle, comprising: a restriction means for restricting air flow.