JPH0358926B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) 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 _F corresponding to the heater core upstream temperature, mixer door opening degree, and outlet air temperature for air outlet selection
Japanese Utility Model Publication No. 54-31704 discloses that the air outlet is selected according to the data _TF .

However, according to the conventional vehicle air conditioner as described above, when the value of the data T _F decreases, that is, when the temperature of the blown air becomes low, the air conditioner switches to vent blowing. However, even if the outside temperature is low, if there is sunlight, the cabin temperature control signal value increases, and the air conditioning control controls the blowing air temperature to be low. Therefore, the vent blows out, and air at a low blowing temperature hits the occupant's head regardless of solar radiation, improving the feeling of the head. However, the room temperature is low, and the temperature at the feet of the occupants does not rise due to the low blowout temperature of the air, so there is a problem in that the so-called cold head and warm feet sensation cannot be obtained.

This problem occurs during the winter season just before the transition to the intermediate season.
It also occurs frequently during the intermediate period.

(Objective of the Invention) The present invention has been made in view of the above, and generally in the bilevel mode, due to its structure, the top blowout tends to be cold air and the bottom blowout tends to be warm air, so the heater has independent temperature adjustment for the top and bottom. By using a conventional heater unit without using a heater, etc., and utilizing the characteristics of a conventional heater unit, it is possible to eliminate the above-mentioned problems and give the occupants a feeling of cold head and warm feet even when the outside temperature is low and there is sunlight. The purpose is to provide a vehicle air conditioner that can achieve

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

It is equipped with a heating means 2 that works as a heat exchange means together with the cooling means 1, and a damper means 3 that controls the ratio of the air flow rate branched to the heating means 2, and the amount of intake air flowing into the heating means 2 is controlled by the opening degree of the damper means 3. to control the amount of heat exchange. The intake air that has passed through the heat exchange means 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 , the predetermined temperature set by the temperature setting device 40 , the outside air temperature detected by the outside air temperature sensor 39 , and the amount of solar radiation detected by the amount of solar radiation detection sensor 37 is supplied to the arithmetic and control means 6, where the arithmetic and control means 6 calculates an opening control signal for at least the damper means 3 according to the vehicle interior temperature, set temperature, outside temperature, and amount of solar radiation. 3 and the temperature is controlled.

On the other hand, the output of the temperature detection means 4 that detects the upstream temperature of the heating means 2 and the output of the opening degree detection means 5 that detects the opening degree of the damper means 3 are supplied to the calculation control means 6, and both input The temperature of the air blown into the vehicle compartment 34 is calculated, and as the calculated air temperature decreases, one of the lower air outlet 32, both the lower air outlet 32 and the upper air outlet 31, or the upper air outlet 31 is Mode switching mode switching means 2 to select
0 is controlled.

In the present invention, the opening degree control signal outputted from the calculation control means 6 is limited by the limiter 9,
The opening degree of the damper means 3 is selectively regulated in order to cause a predetermined ratio of air to flow through the heating means 2. That is, 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. The opening 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, the selection means 10 selects the output of the limiter 9. Also, 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, the opening of the damper means 3 is controlled by the output of the limiter 9, and the opening of the damper means 3 is regulated to a predetermined value. The intake air amount exceeding the ratio flows to the heating means 2 and is heated. However, when the bilevel mode is generally selected, the temperature of the air blown from the upper outlet 31 is relatively low and the temperature of the air blown from the lower outlet 32 is relatively high due to the characteristics of the heating means 2. maintained, the upper blowing air is maintained as cold air,
The blowing air will be maintained as warm air. 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 one 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 has an intake door 14, a blower 15, an evaporator 16, a mixer door 17, and a heater core 18 arranged in this order from the upstream side of the duct 13, and an air outlet 31 to the vehicle compartment 34 on the most downstream side. 32 and a mode switching door 19 for selecting the air outlets 31 and 32.

Here, when the heater core 18 selects air blowing from the air blowing ports 31 and 32, the mix door opening degree is a predetermined amount or more, the temperature of the air blowing from the air blowing ports 31 does not rise much within a predetermined range, and the air The temperature of the air blown out from the outlet 32 is configured to rise.

The intake door 14 is the motor actuator 2
1, and is 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. Air taken in by the military transport aircraft 15 through the intake door 14 passes through the evaporator 16 and is cooled when the cooler 26 including the evaporator 16 is in operation.

22 is a compressor, 23 is a capacitor, 24
25 is a receiver tank, and 25 is an expansion valve, which together with the evaporator 16 constitutes a cooler 26. The rotation of the output shaft of the vehicle internal combustion engine is transmitted to the pulley 27 . The rotation of pulley 27 is transmitted to compressor 22 via magnet clutch 28, and compressor 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 a motor actuator 30, and the amount of air passing through the heater core 18 in the amount of air passing through the evaporator 16 is controlled by the opening degree of the mix door 17.

On the other hand, as will be described later, the amount of air blown by the blower 15, the operation timing and period of the cooler 26, and the opening degree of the mixer door 17 are controlled by the output from the control device 12 in accordance with values related to the deviation between the vehicle interior temperature and the set temperature. Each of these is controlled separately to control the vehicle interior temperature to a desired temperature.

The air outlet 31 forms an upper outlet, the air suction outlet 32 forms a lower outlet, and the mode switching door 19 switches between the air outlets 31 and 32.
You can choose one or both. 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 bilevel mode. The mode switching door 19 is driven by an actuator 35.

In FIG. 2, numerals 46 to 50 are drive circuits for driving the motor actuator 21, the blower 15, the magnetic clutch 28, the motor actuator 30, and the motor actuator 35, respectively.

Inside air temperature detection sensor 3 that detects the temperature inside the vehicle
6. A solar radiation detection sensor 37 that detects solar radiation; an evaporator exit air temperature detection sensor 3 that detects the evaporator exit air temperature, that is, the temperature at point A;
8. Outside air temperature detection sensor 3 that detects outside air temperature
9. Potentiometer 41 that detects the opening degree of mixer door 17; Temperature setting device 4 that sets the cabin temperature
0 is set. The 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 shown in the figure. The signal is supplied to an A/D converter (hereinafter referred to as ADC) 43 via a multiplexer (not shown) 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 basically includes a CPU 12 _-1 , a ROM 12 _-2 that stores programs, a RAM 12 _-3 that stores data, an input port 12 _-4 , and an output port 12 _-5 . From input port 12 _-4
The output digital data of the ADC 43 is read 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 _12-2. Drive circuit 46 through ₅
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.

When the program is started, initial settings such as clearing _RAM12-3 and storing the initial value T _R1 of the vehicle interior temperature are made (step a), and then
Digital data from ADC43 is read,
The data is stored in a predetermined area of RAM _12-3 (step b). Following step b, T=T _R +K ₁ T _S +
The total data of K ₂ T _A +K ₃ T _E -K ₄ T _D +K ₅ is calculated (step c). Here, T _R is the vehicle interior temperature, T _S
is the amount of solar radiation, T _A is the outside air temperature, T _E is the evaporator outlet air temperature, T _D is the set temperature, K ₁ to _{K 5} are constants, and the comprehensive data T is the temperature inside the vehicle and the temperature setting device 40.
It corresponds to the value obtained by correcting the deviation from the set temperature by the amount of solar radiation, outside air temperature, and evaporator outlet air temperature.

Following step c, 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). After step d, the mix door 1 is adjusted to the opening degree corresponding to the total data T via the drive circuit 49.
7 is controlled, and energization and de-energization of the magnetic clutch 28 is controlled via the drive circuit 48 to control the operating timing and period of the cooler 26, and the temperature within the vehicle is controlled to a desired value. Control is performed (step e).

Following step e, data of T _F =T _E +K ₆ θ+β is calculated (step f). Here, θ is the opening degree of the mixer door 17, K ₆ is a constant, β is a correction value, and data T _F 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 step f, mode switching is performed in which the mode switching door 19 is switched in accordance with the data _TF to select the air outlet (step g). Step g and then step b are executed.

In one embodiment of the present invention, mode switching control is performed as shown in FIG. That is, when the data T _F decreases following step f, the value r
Whether it is less than or equal to the value s(s
>r) (step g ₁ ). When the data T _F exceeds the value r or s in step _g1 , the lower outlet 32 is selected following step _g1 , and the lower outlet 32 is opened to enter the heat mode (step _g2 ). When the data T _F is less than or equal to the value r or s in step g ₁ , it is determined whether the data T _F is less than or equal to the value u (u≦r) when increasing, and exceeds the value t (t<u) when decreasing. It is determined whether or not it is true (step _g3 ). When the data T _F exceeds the value t or u in step _g3 , _the bilevel mode is set in which the upper air outlet 31 and the lower air outlet 32 are selected (step g3).
_g4 ). When the data T _F is less than or equal to the value t or _u in step _g3 , it is determined whether the set temperature of the temperature setting device 40 exceeds the temperature w when increasing, and the temperature v( when decreasing). lol
>v) It is determined whether or not it is less than or equal to (step
_g5 ). When the set temperature is lower than the temperature w or v in step _g5 , the upper outlet 31 is selected following step _g5 , and the upper outlet 31 is opened to enter the vent mode (step _g6 ). step g ₅
Subsequently, by executing step _g6 , the control by steps _g7 to _g12 , _g13 , and _g14 , which will be described later, is canceled.

In step g ₅ , the set temperature is set to temperature v or w.
If the outside air temperature exceeds y, then it is determined in step _g5 whether or not it exceeds temperature y when the outside air temperature increases, and whether it is below temperature x (x<y) when it decreases (step g5). _g7 ). If the outside air temperature exceeds the temperature x or y in step _g7 , step _g6 is executed following step _g7 . When the outside air temperature is below the temperature x or y in step _g7 , and when the cabin temperature increases following step _g7 , the cabin interior temperature is p or q.
It is determined whether the temperature inside the vehicle exceeds (q>q) or whether the temperature inside the vehicle is below p or q when the temperature inside the vehicle is decreasing (step g ₈ ). Following step _g8 , it is checked whether the T _r1 change flag is set (steps _g13 , _g14 ). If the temperature inside the vehicle exceeds p or q _{in step g8, step g13 is executed} following step g8. If the T _R1 change flag is not set in step _g13 , the detected vehicle interior temperature T _R is stored in the RAM _12-3 in place of the initial value T _R1 set _in step a following step g13.
The _TR1 change flag is set (step _g9 ).
Following step _g9 , step _g6 is executed. Further, if it is detected in step _g13 that the _TR1 change flag is set, step _g9 is jumped and step _g6 is executed.

If the temperature inside the vehicle is below p or q in step _g8 , step _g14 follows step g8 _.
is executed. If the T _R1 change flag is not set in step _g14 , the detected vehicle interior temperature T _R is stored in the RAM _12-3 in place of the initial setting value T _R1 following step _g14 , as in step _g9 . T _R1 change flag is set (step
_g10 ). Following step _g10 , the opening degree θ of the mixer door 17 is regulated so that it does not become less than a predetermined opening degree (step _g11 ). At step g ₁₄
When it is detected that the T _R1 change flag is set, step _g10 is jumped and step _g11 is executed. Following step _g11 , the minimum air flow rate under automatic control is increased (step _g12 ), and then step _g4 is executed.

Step b is executed following steps g ₂ , g ₄ and g ₆ .

As is clear from the above description, the reference temperature when step _g8 is first executed is the set initial value _TR1 . However, when step _g8 is executed after the first time, the detected vehicle interior temperature _TR is used instead of the set initial value _TR1 . In addition, since the T _R1 change flag is also set, when step _g8 is executed from the second time, the detected vehicle interior temperature replaced above will be set.
The temperature will be calculated in step _g8 based on T _R. Thereafter, steps _g9 and _g10 will not be executed unless they are executed from step a.
This is because the detected vehicle interior temperature at the time of startup is unknown.
This is to detect a more accurate temperature change based on the first detected vehicle interior temperature _TR from the second time onwards when step _g8 is executed.

Here, step _g7 is a step for determining the outside air temperature at which steps _g11 to _g12 are executed, and when the outside air temperature increases, it is y degrees or less, or when it decreases, it is x degrees or less, The opening degree of the mixer door 17 is not controlled below the predetermined opening degree and the blower 1
Since the low air volume value of No. 5 is increased and the bi-level mode is selected, a predetermined amount of air passing through the heater core 18 is secured and heated. Therefore, the air blown out from the lower outlet 32 is heated to a temperature sufficient to warm the feet, and the air blown out from the upper outlet 31 has a lower temperature than the air blown out from the lower outlet 32. It can give the occupants a feeling of cold head and warm feet.

Furthermore, in order to prevent the interior of the vehicle from becoming warm and uncomfortable due to the above, the vehicle interior temperature is detected in step _g8 , and if the vehicle interior temperature exceeds a predetermined value, steps _g11 and _g12 are executed. Instead, it is placed in vent mode to prevent discomfort.

However, when the amount of solar radiation is large, the total data becomes large and the mix door 17 is controlled to the full cool side, that is, to the θ=0% side, but when the outside temperature drops, the mix door opening is limited to a predetermined value. It is not controlled below the opening degree and is controlled in bi-level mode. Therefore, when the amount of solar radiation is large and the outside temperature drops, a predetermined amount of air is ensured to flow into the heater core 18, and in addition, since it is controlled in bi-level mode, warm air is blown out from the lower air outlet 32. Air with a temperature lower than that blown out from the lower air outlet 32 is blown out from the upper air outlet 31, thereby eliminating the inconvenience of cooling the feet of the occupant and giving the occupant a feeling of cold head and warm feet.

(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 is below a predetermined temperature, the opening degree of the damper means is limited and the air volume is increased to a predetermined ratio or above. Since the heated air is caused to flow into the heating means and the bilevel mode is selected, warm air is blown out from the lower air outlet and warmed air is blown out from the lower air outlet due to the above-mentioned characteristics of the heating means. Since the air is blown out at a temperature lower than the air temperature at which the vehicle is operated, it is possible to give the occupants a cold head and warm feet when the outside air is low and there is sunlight, which occurs in winter and mid-season.

Further, when the temperature inside the vehicle exceeds a predetermined temperature, the opening degree of the damper means is not limited and the bi-level mode is not selected, so that the occupant does not feel uncomfortable.

Furthermore, when the temperature inside the vehicle exceeds a predetermined temperature as a result of limiting the opening degree of the damper means, the opening degree limit and bi-level selection of the damper means are canceled and normal mode control in which the vent mode is selected is performed. Since it is returned to its original position, it does not cause any discomfort to the occupants.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. Second
The figure is a block diagram showing the configuration of an embodiment of the present invention.
3 and 4 are flowcharts for explaining the operation of one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Cooling means, 2...Heating means, 3...Damper means, 4...Temperature detection means, 5...Opening degree detection means, 6...Arithmetic control means, _8-1 and _8-2 ...Discrimination Means, 9... Limitation, 10... Selection means, 2
0...Mode switching means, 31...Upper air outlet, 3
2... Lower air outlet, 34... Vehicle interior, 36... Inner air temperature detection sensor, 37... Solar radiation amount detection sensor, 3
9...Outside temperature detection sensor, 40...Temperature setting device.

Claims (1)

[Claims] 1. A heating means provided so that the temperature of the air blown from the lower air outlet is higher than the temperature of the air blown from the upper air outlet when the upper and lower air outlets are selected for blowing air into the cooling means and the vehicle compartment. and a heat exchange means for exchanging heat with intake air, and an opening controlled to an opening calculated according to signals from at least a vehicle interior temperature setting device, a vehicle interior temperature sensor, an outside temperature sensor, and a solar radiation detection sensor. A damper means for adjusting the ratio of the amount of air to be diverted to the heating means; mode switching means for selecting either one of the outlet and the upper air outlet and guiding the intake air through the heat exchange means to the passenger compartment, and controlling at least the opening degree of the damper means; In a vehicle air conditioner that controls vehicle interior temperature by a limiter that regulates an opening control signal to the damper means in order to cause an amount of air equal to or higher than a predetermined ratio to flow into the heating means; and upon receiving the outputs of the first and second determining means; selection means for selecting control of the damper means by the output of the limiter instead of control of the damper means by the opening degree control signal; and a lower air outlet.