JPS626818A - Air conditioner for vehicles - Google Patents

Abstract

PURPOSE:To improve a feeling of comfortableness in cooling the head but warming the feet, by constituting an air conditioner so as to select a by-level mode automatically when outside temperature is below the specified one and a variation in temperature inside a car room or the said temperture is less than the specified value. CONSTITUTION:An air conditioner bearing the above caption makes air passing through a cooling device 1 flow into a heating device 2 according to a degree of opening in a damper device 3 whereby it regulates the extent of blowoff air temperature, blowing the air into a car room 34 via upper and/or lower blowoff ports 31 and 32 selected by a mode selector device 20. In this case, when a fact that outside temperature by an outside temperature detecting device is below the specified one is discriminated by a discriminating device 8-1 as well as when a fact that a car room temperature by an inside temperature detecting device 36 is less than the specified value is discriminated by another discriminating device 8-2, output of a limiter 9 is selected by a selector device 10, and a degree of opening in the damper 3 is regulated to the specified one. And, simultaneously the mode selector device 20 is controlled, making it select these upper and lower blowoff ports 31 and 32.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a vehicle air conditioner, and more particularly, to a vehicle air conditioner that appropriately selects air outlets when the outside temperature is low and there is sunlight.

(Prior art) In a conventional vehicle air conditioner, data T corresponding to the heater core upstream temperature, mix door opening degree, and air outlet temperature for selecting the next air outlet are calculated, and the data T is used. The air outlet can be selected by
It is disclosed in Publication No. 704.

However, according to the conventional vehicle air conditioner as described above, when the value of 7 in the data decreases, that is, when the air outlet temperature becomes low, the air outlet is switched to vent air, so when the outside temperature is low and there is sunlight, If air with a low outlet temperature is required, the vent will blow out, but the occupant's head will be warmed by sunlight, and the temperature at the occupant's feet will not rise, preventing the feeling of cold head and warm feet. There was a problem.

(Object of the Invention) The present invention has been made in view of the above, and uses a conventional heater unit without using a heater with independent upper and lower temperature adjustment, so that the above-mentioned effect can be achieved even when the outside air temperature is low and there is sunlight. To provide an air conditioner for a vehicle that can solve problems and give occupants a feeling of cold head and warm feet.

(Structure and operation of the invention) FIG. 1 is a block diagram showing the configuration of the present invention.

a heating means 2 which acts as a heat exchange means together with the cooling means 1;
The heating means 2 is equipped with a damping means 3 for controlling the ratio of the air flow rate divided into the heating means 2, and the heating means 2 is controlled by the opening degree of the men 24 means 3.
The amount of heat exchange is controlled by controlling the amount of intake air flowing into the pump. The intake air through the heat exchange means 2 undergoes heat exchange and is introduced into the vehicle compartment 34 through the upper air outlet 31 and/or the lower air outlet 32 selected by the mode switching means 20 that selects the air outlet mode.

On the other hand, the vehicle interior temperature detected by the inside air temperature detection sensor 36 and the set temperature set by the temperature setting device 40 are as follows.
The deviation is calculated by the calculation control means 6, and an opening control signal for at least the damper means 3 is calculated in order to bring the vehicle interior temperature to the set temperature, and the signal is supplied to the member 74 means 3. temperature control.

On the other hand, the output of the temperature detection means 4 for detecting the temperature on the upstream side of the heating means 2 and the output of the opening degree detection means 5 for detecting the opening degree of the dank means 3 are supplied to the arithmetic and control means 6 so that both can be operated manually. The temperature of the air flowing into the vehicle compartment 34 is calculated, and the mode switching means 20 is controlled according to the calculated air temperature.

In the present invention, the opening degree control signal outputted from the arithmetic control means 6 is limited by the limiter 9, and the opening degree of the damper means 3 is selectively regulated in order to cause a predetermined ratio of air amount to flow through the heating means 2. That is, the outside air temperature is detected by the outside air temperature detecting means 7, and the determining means 8-1 determines whether the detected outside air temperature is below a predetermined temperature. Further, the determining means 8-2 determines whether the vehicle interior temperature is below a predetermined temperature or whether the vehicle interior temperature change is below a predetermined value. The opening degree control signal from the calculation control means 6 and the output of the limiter 9 are supplied to the selection means 10, and the determination means 8-1 determines that the detected outside air temperature is below a predetermined temperature, and the determination means 8-2 determines that the detected outside air temperature is below a predetermined temperature. When it is determined that the vehicle interior temperature is below a predetermined temperature or that the vehicle interior temperature change is below a predetermined value, the selection means 10 selects the output of the limiter 9.

At this time, the mode switching means 20 is controlled by the arithmetic control means 6 to select the upper and lower air outlets 31 and 32.

Therefore, when the outside air temperature is below a predetermined temperature and the vehicle interior temperature is below a predetermined temperature, or when the vehicle interior temperature change is below a predetermined value, the opening of the member 74 means 3 is controlled by the output of the limiter 9. By regulating the opening degree of the damper means 3, an amount of intake air equal to or higher than a predetermined ratio flows into the heating means 2 and is heated, and the heat-exchanged air is guided to the passenger compartment from the upper air outlet 31 and the lower air outlet. As a result, the occupant feels a cold head and warm feet.

(Example of the invention) 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 body 11 includes an intake door 14, a blower 15, an evaporator 16, a mix door 17, and a heater core 18 arranged in this order from the upstream side of the duct 13, and an air outlet to the vehicle interior 34 on the most downstream side. A mode switching door 19 is provided for selecting between the air outlet 31, 32 and the air outlet 31,32.

The intake door 14 is switched by the motor actuator 21 and driven to select one of a full outside air introduction position, a vehicle interior air introduction position, or a partial outside air introduction position. When the partial outside air introduction position is selected, outside air and vehicle interior air are mixed and sucked.

The air sucked in by the blower 15 through the intake door 14 passes through the evaporator 16 and
When the cooler 26 including 6 is in operation, it is cooled.

22 is a compressor, 23 is a condenser, 24 is a receiver tank, and 25 is an expansion valve, which together with the rotator 16 constitute a cooler 26. The rotation of the output shaft of the vehicle internal combustion engine is transmitted to the pulley 27 . The rotation of the pulley 27 is transmitted to the compressor 22 via the magnetic clutch 28, and the congressor 22 is driven by this transmission.

The heater core 18 is supplied with cooling water for the internal combustion engine mounted on the vehicle and functions as a heater. The mix door 17 is driven by the motor actuator 30.
In the amount of air passing through the evaporator 16 depending on the opening degree of
The amount of air passing through heater core 18 is controlled.

On the other hand, as will be described later, the amount of air blown by the blower 15, the operating timing and period of the cooler 26, and the opening degree of the mix door 17 correspond to values related to the deviation between the indoor air temperature and the set temperature based on the output from the control device 12, as described later. The air temperature inside the vehicle is controlled to a desired temperature by controlling each of them separately.

The air outlet 31 forms an upper outlet, and the air outlet 32
A lower air outlet is formed, and either one or both of the air outlet 31 and 32 can be selected by means of the mode switching door 19. A state in which the air outlet 31 is selected is referred to as a vent mode, a state in which the air outlet 32 is selected is referred to as a heat mode, and a state in which both air outlets 31 and 32 are selected is referred to as a pie level mode. The mode switching door 19 is driven by an actuator 35.

In addition, in FIG. 2, 46 to 50 are the motor actuator 21, the blower 15, and the magnetic clutch 2, respectively.
8. Motor actuator 30° This is a drive circuit that drives the motor actuator 35.

An inside air temperature detection sensor 36 that detects the vehicle interior temperature, a solar radiation amount detection sensor 37 that detects the amount of solar radiation, an evaporator outlet air temperature detection sensor +j38 that detects the enoguporator outlet air temperature, that is, the temperature at point A, and an outside air temperature. An outside air temperature detection sensor 39, a potentiometer 41 for detecting the opening degree of the mix door 17, and a temperature setting device 40 for setting the cabin temperature are provided. Output of the inside air temperature detection sensor 36,
The output of the solar radiation detection sensor 37, the output of the evaporator outlet air temperature detection sensor 38, the output of the outside air temperature detection sensor 39, the setting output of the temperature setting device 40, and the output of the potentiometer 41 are connected to A via a multi-breather (not shown).
/' The data is supplied to a D converter (hereinafter referred to as ADC) 43 and converted into digital data, and the digital data converted by the ADC 43 is supplied to the control device 12.

The control device 12 is basically a CPU 11. , ROM12-2 that stores programs, RAM that stores data
12 bow, input? -G 12-4. It has an output port 12-5.

The output digital data of the ADC 43 is read from the input data 114 according to the program stored in the ROM 12-2, and the data processed and calculated by the CPU 12-1 according to the program stored in the ROM 12-2 is sent to the output port 12. -5 through the drive circuit 46~
50.

The operation of one embodiment of the present invention according to the program stored in the ROM 12-2 will be explained with reference to the flowcharts shown in FIGS. 3 and 4.

If you start the program, RAM12-s will be cleared,
Initial settings such as storing the initial value TR1 of the vehicle interior air temperature are performed (step a), and then digital data from the ADC 43 is read and stored in a predetermined area of the RAM 12-3 (step b). Following step b, T = TR+KIT8+ to 2TA+, T,- to 4T
The total data of □+K5 is calculated (step C).

Here, TR is the indoor air temperature, T8 is the amount of solar radiation, TA is the outside air temperature, T8 is the evaporator outlet air temperature, TD is the set temperature, 5 is a constant for K1-, and the combined data T is the indoor air temperature. This corresponds to a value obtained by correcting the deviation from the set temperature of the temperature setting device 40 by the amount of solar radiation, the outside air temperature, and the evaporator outlet air temperature.

Following the Stella 7'e, known blower control is performed to control the blower 15 via the drive device 47 to an air blowing amount corresponding to the total data T (step d).

Next, in step d, the mix door 17 is controlled via the drive circuit 49 to an opening degree corresponding to the overall data T, and the energization/de-energization of the magnetic clutch 28 is controlled via the drive circuit 48 to control the cooling machine 26. The operating timing and period of the engine are controlled, and known temperature control is performed to control the vehicle interior air temperature to a desired value (step e).

Step eK Subsequently, data of 6θ+β is calculated for T,=T,+ (step f). Here, θ is the opening degree of the mix door 17, K6 is a constant, β is a correction value, and data T
, corresponds to the temperature of the air blown into the vehicle compartment 34. Further, θ=100 is the opening degree when all the air that has passed through the evaporator 16 is allowed to pass through the heater core 18.

Following the stellar 7'f, a mode change is performed in which the air outlet is selected by switching the mode switching door 19 in response to the data T (step g). Following step g, step b is executed.

In one embodiment of the present invention, mode switching control is performed as shown in FIG. That is, following step f, it is determined whether the data T2 is less than or equal to the value r when decreasing, and whether it exceeds the value 5(s)r) when increasing (step g1).

When the data T exceeds the value r or 3 in step g1, the lower air outlet 32 is selected following step g, and the lower air outlet 32 is opened to enter the heat mode (step gz). In Stellar fg1, when the data T is less than or equal to the value r or 3, it is determined whether the data T is less than or equal to the value u (u≦r) when it increases, and whether it exceeds the value t (t(u)) when it decreases. It is determined whether or not (step fgs).

In step g3, when the data T exceeds the value t or U, a pie level mode trap is set in which the upper air outlet 31 and the lower air outlet 32 are selected next to the Stella fg (Stella 7' ga ). If the data T is less than or equal to the value t or U in step g3, it is determined in step g3 whether or not the set temperature of the temperature setting device 40 exceeds the temperature W when increasing, and whether the set temperature of the temperature setting device 40 exceeds the temperature W when decreasing.
W〉Ma) or less is determined (step gs
). When the set temperature is lower than temperature W or M in step gs, the upper outlet 31 is selected following step fg5, and the upper outlet 31 is opened to enter the pent mode (stellar fg6'). By executing Stella fg6 following Stella fg5, Stella fg to be described later is executed.
The control by 7 to g1□·g and 5·T14 is canceled.

In step g5, if the set temperature exceeds temperature M or W, then in step g5, whether or not the outside air temperature exceeds temperature y when increasing, and whether temperature - (x<y) when decreasing. It is determined whether or not (step f gy ). If the outside air temperature exceeds temperature X or y in step g7, step fg6 is executed following step g7.

In step g7, when the outside air temperature is below the temperature
When Tl-T11) increases, it is determined whether the change in temperature exceeds p or q (q>p), and when the change in temperature decreases, it is determined whether the change in temperature is less than or equal to p or q. (Stella 7'ga). Step gaK Subsequently, it is checked whether the T11 change flag is set (steps g, 32g, 4).

If the change in temperature exceeds p or q in step g8, step f T13 is executed following step 8. If the TB1 change flag is not set in step g15, the detected vehicle interior temperature T8 is stored in the RAM 12-s in place of the initial setting value TR1 in step a following step "T13" and the T8. change flag is set. (step g9). Stella 7'
Following gt, step g6 is executed. Also, T at Stella fK1B! If it is detected that the 11 change flag is set, step g9 is jumped and step g6 is executed.

Further, when the change in temperature in step fta is less than p or q, step fg14 is executed following Stella 7'ga. When the TR1 change flag is not set in step g14, following Stella 7'g14, the detected vehicle interior temperature TI is stored in the RAM 12-3 instead of the initial setting value T11, as in step g9, and Ti
A change flag is set (step g, .). STETSU 7°g. Subsequently, the opening degree θ of the mix door 17 is regulated so that it does not become less than a predetermined opening degree (step g
11). If it is detected in step f14 that the Tl11 change flag is set, Stellar "glo" is jumped and step g11 is executed.
Following step 11, the minimum air flow rate under automatic control is increased (step g, 2), and then step g4 is executed.

Stella fb is executed following steps g21 to g41 K6.

As is clear from the above description, the reference temperature when Stellar fKB is first executed is the set initial value T-blade 1. However, when Stella 7'g8 is executed after the first time, the detected vehicle interior temperature T8 is used instead of the set initial value TR1. Furthermore, since the TR1 change flag is fully set, when step g8 is executed for the second time, the change in temperature will be calculated in step g8 based on the replaced detected vehicle interior temperature TB. Thereafter, steps g9 and glo will not be executed unless executed from step fa. This is because the detected vehicle interior temperature at the time of startup is unknown, and from the second execution of step g8 onward, correct changes in temperature are detected based on the first detected vehicle interior temperature TI.

Here step g7 is step g1. ~[12 is the step of determining the outside air temperature to be executed, and when the outside air temperature increases and is y degrees or less, or when it decreases and is 1 degree or less, the opening degree of the mix door 170 becomes less than the predetermined opening degree. Because the low air volume value of the air flow rate of the blower 15 is increased without being controlled, and because the pie level mode is selected, a predetermined amount of air passing through the heater core 18 is secured and heated, and air flows from the lower air outlet 31. Since the air is also blown out, it is possible to give the occupants a feeling of coldness in the head and heat in the legs.

Furthermore, in order to prevent the interior of the vehicle from becoming warm and uncomfortable due to the above, a change in the interior temperature of the vehicle is detected in step g8. Steps 12 and 12 are not executed, and the vent mode is set to prevent discomfort.Furthermore, in step g8, the change in vehicle interior temperature (TRT
l11) was used, but the vehicle interior temperature may be used instead.

In addition, in step g7, depending on the outside temperature, the vent mode (step g6), the top pipe repel mode (stellar fg
4), but since the mixed door opening angle falls below the regulation value when the outside temperature is low and the amount of solar radiation is large, the amount of solar radiation is also determined based only on the outside temperature. It is similar to . Further, in step g7, the amount of solar radiation may be used instead of the outside temperature.

Further, the regulation value of the mix door opening degree in Stella fg11 may be a value corrected based on changes in the intake air temperature of the evaporator 16, the operating status of the temperature control means that controls the operation and stop of the compressor 23, and the like.

(Effects of the Invention) As explained above, according to the present invention, when the outside air temperature is below a predetermined temperature and the vehicle interior temperature or the change in the vehicle interior temperature is below a predetermined temperature, the pie level mode is selected. When the outside temperature is low and there is sunlight, such as in winter, the passenger can feel a cold head and warm feet.

In addition, when the temperature inside the vehicle or the temperature change in the vehicle interior exceeds a predetermined temperature due to the mixed door opening degree being regulated, the normal mode control is returned to which selects the vent mode, so there is no discomfort to the occupants. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention. FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention. 3 and 4 are flowcharts for explaining the operation of an embodiment of the present invention. 1... Cooling means, 2... Heating means, 3... Dan.
Flat means, 4 and 7...Temperature detection means, 5...Opening degree detection means, 6...Arithmetic control means, 8-1 and 8-2
... Discrimination means, 9... Limiter, 10... Selection means, 20... Mode switching means, 31... Upper air outlet, 32... Lower air outlet, 34... Vehicle interior, 36...
Inside air temperature detection sensor, 40...temperature setting device.

Claims (1)

[Claims] A heat exchange means configured of a cooling means and a heating means to exchange heat with the intake air, a damper means for adjusting a ratio of air amount to be diverted to the heating means, and a heat exchange means for directing the intake air through the heat exchange means to the passenger compartment. mode switching means for selecting an upper and/or lower air outlet to guide the vehicle; In a vehicle air conditioner that controls the mode switching means according to a calculated outlet air temperature calculated from the temperature, the air conditioner includes a temperature detection means for detecting outside air temperature, and a first temperature sensing means for determining whether the detected outside air temperature is below a predetermined value. a determining means, a second determining means for determining whether the vehicle interior temperature is below a predetermined value or a change in the vehicle interior temperature is below a predetermined value, and the damper means for causing intake air to flow to the heating means at a predetermined ratio or more. a limiter for regulating an opening control signal to the opening control signal; and a selection means for receiving the outputs of the first and second determining means and selecting either the output of the limiter or the opening control signal; While the first and second determining means are generating outputs, the output of the limiter means is selected to control the opening degree of the damper means, and the mode switching means selects the upper and lower air outlets. Vehicle air conditioner.