JPH0573604B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air conditioner for a vehicle, and more specifically, it corrects the amount of solar radiation, limits the upper limit of the correction value, and detects the upper limit. The present invention relates to a vehicle air conditioner that changes depending on the outside temperature.

(Prior Art) In a vehicle air conditioner, the air conditioning control means is controlled using the amount of solar radiation as one of the limiting factors.

In this case, it is practical to control the cabin air temperature in a way that adapts to the senses of the occupants by changing the gain on the input/output characteristics of the solar radiation sensor depending on whether it is heating or cooling. Shown in Kosho 54-31468.

On the other hand, photoelectric conversion elements are also used as solar radiation detection sensors. Although photoelectric conversion elements are advantageous because they are not directly affected by temperature, their response speed is too fast, and there is a problem in that even temporary light shielding causes the air conditioning control means to operate unnecessarily.

For this purpose, a device is known in which the output of the detected amount of solar radiation is delayed, as shown in Japanese Patent Publication No. 19484/1984.

(Problems to be Solved by the Invention) As described above, changing the gain on the input/output characteristics of the solar radiation sensor between summer and winter is not necessarily comfortable for the occupant. This is because when the outside temperature is low, for example in winter, the altitude of solar radiation is low, so the solar radiation hits the occupants directly, and the amount of direct solar radiation hitting the occupants is not much different between summer and winter, so the heat on the upper body is almost the same. Similarly, there is a problem in that in winter, passengers wear thick clothes, so unless the correction value is equal to or higher than that in summer, it will not be comfortable for the passengers.

Furthermore, when a photoelectric conversion element is used as a solar radiation detection sensor, there is a problem that simply delaying the output does not allow for good control that matches the changes in the occupant's sense of sensation.

An object of the present invention is to provide an air conditioner for a vehicle that solves the above-mentioned problems by making it possible to change the upper limit of the correction value based on the amount of solar radiation in winter and summer depending on the outside temperature.

(Means for Solving the Problems) In order to solve the above problems, the present invention has the following features:
As shown in the figure, a vehicle interior temperature detection means 1, a vehicle interior temperature setting means 2, an outside temperature detection means 3, a solar radiation amount detection means 4 for detecting the amount of solar radiation received by the vehicle, a detected vehicle interior temperature and a set vehicle interior temperature. (In Figure 1, this calculation means is
₁ ) and corrects the calculated output according to the detected outside air temperature and the detected amount of solar radiation (in Fig. 1, the correction means for this correction are 5 2 and 5 ₂ , respectively).
5) A vehicle air conditioner comprising a calculation means 5 (shown in ₃ ), which uses the output of the calculation means 5 as a vehicle interior temperature control signal to control a temperature control means 6 such as mix damper opening and air blowing amount based on the signal. In the apparatus, a limit means 7 is provided which limits the upper limit of the correction value based on the detected amount of solar radiation and changes the upper limit based on the detected outside air temperature.

(Function) According to the present invention configured as described above, the vehicle interior temperature control signal for controlling the temperature control means 6 is based on the detected vehicle interior temperature detected by the vehicle interior temperature detection means 1 and the vehicle interior temperature setting device. The calculation means 5 ₁ calculates the signal related to the deviation from the set cabin temperature according to 2, and corrects it by the correction means 5 ₂ based on the outside air temperature detected by the outside air temperature detection means 3.
The correction means ₅₃ corrects the amount of solar radiation detected by the amount of solar radiation detection means 4, and the signal related to the deviation is corrected by the calculation means 5 based on the outputs of the correction means ₅₂ and ₅₃ . Output as a control signal. In this case, the correction means 5 ₃
The correction value is supplied via the limiter 7, and the limiter 7 limits the upper limit of the correction value. The upper limit of this correction value changes in accordance with the outside temperature, and is smaller than in the case where the correction is made in accordance with the detected amount of solar radiation without a limiter. Also,
In the range where the upper limit of the correction value is not restricted, the correction value based on solar radiation in winter is equal to the correction value based on solar radiation in summer, and when the amount of solar radiation increases, the upper limit of the correction value based on solar radiation increases with the outside temperature. As a result, the occupants no longer experience any discomfort.

(Example of the invention) The present invention will be explained below with reference to Examples.

FIG. 2 is a block diagram of a vehicle air conditioner according to an embodiment of the present invention.

21 is an air conditioner main body, and 22 is a control device that controls the air conditioner main body 21.

The air conditioner main body 21 sucks in air from the upstream side to the downstream side of the duct 23 via an intake damper 24 that controls whether to circulate internal air, introduce some outside air, or introduce all outside air. A blower 25 that blows air into the vehicle interior 30, an evaporator 26 that exchanges heat with the blown air while a cooler 34 (described later) is in operation
A mix dump 27 controls the amount of air that is diverted to a heater 28 (to be described later) in the air that has passed through, a heater core 28 that circulates the cooling water of the vehicle internal combustion engine and acts as a heater to heat the passing air, and an air blower to the passenger compartment 30. A mode switching damper 29 for selecting the exit is provided.

The compressor 35, condenser 36, receiver tank 37, and expansion valve 38 together with the evaporator 26 constitute a cooler 34. Furthermore, the rotation of the output shaft of the vehicle-mounted internal combustion engine is transmitted to the pulley 39. The rotation of the pulley 39 is controlled by the magnetic clutch 4.
0 to the compressor 35, and this transmission drives the compressor 35.

The air outlet to the passenger compartment 30 includes a vent outlet 31 that blows air toward the face of the occupant, and a heat outlet 32 that blows air from the feet of the occupant. Both are selected.

The intake damper 24 is driven by a motor actuator 33, the mix damper 27 is driven by a motor actuator 41, and the mode switching damper 29 is driven by a motor actuator 42. In addition, in FIG. 2, 44 to 48 are the motor actuator 33, the blower 25, the magnetic clutch 40, the motor actuator 41, and
42 separately.

On the other hand, an inside air temperature sensor 50 detects the indoor air temperature, a solar radiation sensor 51 detects the amount of solar radiation, an evaporator outlet air temperature sensor 52 that detects the evaporator exit air temperature, that is, the temperature at point A, and an outside air temperature sensor 52 that detects the outside air temperature. A sensor 53, a setting device 54 for setting the vehicle interior temperature, and a potentiometer 55 for detecting the opening degree of the mix damper are provided. The output of each sensor, the output of the setting device 54 and the output of the potentiometer 55 are supplied to an A/D converter (hereinafter referred to as ADC) 57 via a multiplexer 56 and converted into digital data, which is converted by the ADC 57. The digital data thus obtained is supplied to a microcomputer 58.

The microcomputer 58 is basically a CPU,
It is equipped with ROM for storing programs, RAM for storing data, input ports, and output ports. Digital data output from the ADC 57 according to the program stored in the ROM is read through the input port, and the data processed and calculated by the CPU is output to the drive circuits 44 to 48 through the output port. The amount of air blown by the blower 25, the operating timing and period of the compressor 35 controlled via the magnetic clutch 40, the opening control of the mix damper 27, and the intake damper 24
The opening degree is controlled to bring the vehicle interior temperature to the set temperature. In addition, intake damper 24
The ratio between the amount of internal air circulation and the amount of outside air introduced is controlled by the degree of opening.

The operation of one embodiment of the present invention will be explained with reference to the flowchart of FIG. 3 in accordance with the program stored in the ROM.

When the program starts running, initial settings such as clearing the RAM are performed (step a).
Next, the digital data converted outputs of the sensors 50 to 53, the output of the setting device 54, and the output from the potentiometer 55 are read through the input port, and are temporarily stored in a predetermined area of the RAM to generate the vehicle interior temperature control signal ( (hereinafter referred to as total data) T=
T _R +K ₁ T _E +K ₂ T _A +K ₃ T _S -K ₄ T _D +K ₅ is calculated and stored (step b). Here, T _R is the vehicle interior air temperature, T _E is the evaporator outlet air temperature, T _A
represents the outside air temperature, and T _S represents the amount of solar radiation, which are detected by the sensors 50 to 53. T _D is the set temperature set by the setting device 54, and K ₁ to _{K 5}
is a constant. Therefore, the integrated data T is related to the deviation between the set cabin temperature and the detected cabin air temperature, and is also related to the evaporator outlet air temperature T _E , the amount of solar radiation T _S ,
Corresponds to the value corrected by the outside air temperature T _A ,
It can also be said to be a value related to the heat load for controlling the vehicle interior temperature to the set vehicle interior temperature.

Following step b, the total data T is corrected as described below (FIG. 5) (step c). below,
The corrected combined data will also be simply referred to as combined data.

Following step c, data T _F =T _E +K ₆ θ+β
is calculated and stored (step d). Here, θ indicates the opening degree of the mix damper 27, and all the air passing through the evaporator 26 is transferred to the heater core 2.
The opening degree when passing through 8 is θ = 100%
(FH). Furthermore, K ₆ and β are constants. Therefore, the data T _F corresponds to the temperature of the air blown into the vehicle compartment 30.

Following step d, the amount of air blown by the blower 25 is controlled according to the pattern shown in FIG. 4a (step e). Next, the opening degree of the mix damper 27 is controlled according to the pattern shown in FIG. 4b (step f), and then the driving set temperature of the compressor 35 is controlled according to the pattern shown in FIG. 4c. (Step g). In step g, when the evaporator outlet air temperature T _E is equal to or higher than the temperature pattern shown in FIG. 4c, the magnetic clutch 40 is energized to drive the compressor 35, and when it is less than the temperature pattern shown in FIG. Compressor control is performed in which the magnetic clutch 40 is de-energized. The horizontal axes of FIGS. 4a, b and c are the combined data corrected in step c. Following step g, the opening degree of the intake damper 24 is controlled to be in the state of air circulation, outside air introduction, or partial outside air introduction in relation to the blower air volume and compressor drive (step h). Through steps e to h, the vehicle interior temperature is controlled to the set vehicle interior temperature. Following step h, blowout mode control is performed to select the vent outlet 31 and/or the heat outlet 32 according to the data T _F (step i);
Following step i, step b is executed again.

The total data correction step c is executed as shown in FIG.

In FIG. 5, T _s and T _s ' are values converted to integrated data, T _s is a correction value, and T _s ' is a target correction value.

In the total data correction step c, a correction value _Ts is added to the total data T, and the total data T is adjusted to the correction value.
Correct by T _s (step c ₁ ). Following step _c1 , it is checked whether the correction value _Ts is equal to the correction target value Ts _' (step _c2 ). Here, the corrected target value
T _s ′ is a value obtained by multiplying the amount of solar radiation detected by the solar radiation amount sensor 51 by a constant K ₃ and converted into integrated data. For example, when sunlight becomes intermittent, the corrected target value T _s ′ is When the response speed of the amount detection sensor is fast, the change occurs as shown in FIG. 6a.

When the correction value T _s and the target value T _s ' are equal in step c ₂ , following step c _2, the A flag can be set to enable the timer setting when the correction value increases, and the timer setting when the correction value is decreased. The B flag is set (steps C ₃ and C ₄ ), and step d is executed. This route is executed when the target correction value T _s ′ and the limited correction value T _s described later are equal, and when the target correction value T _s ′ changes and the value falls within the limit range. This is the case. From step d onwards, the corrected combined data is used.

In step _c2 , the correction value T _s and the target correction value
If T _s ′ are not equal, it is checked whether [target correction value T _s ′ > correction value T _s ] (step
_c5 ). When the solar radiation correction starts to be performed, that is _, when the target correction value T _{s '} in _FIG . This is a case where the value is increased. In this case, following step _c5 , the B flag is set (step _c6 ), and it is checked whether the A flag is set (step c6).
_c7 ). The reason why the B flag is set in step _c6 is to enable the setting of the B timer when the correction value decreases, which will be described later, even when the correction value increases, which will be described later, shifts to the correction value decrease.

When the A flag is set in step _c7 , that is, when steps _c5 to _c7 are entered for the first time from another route, the A flag is set, and following step _c7 , the A timer starts counting. The program is started (step _c8 ), and the A flag is reset (step _c9 ). Following step _c9 , it is checked whether the time set by the A timer, for example _t2 seconds, has elapsed (step _c10 ). A at step c ₇
If the flag has been reset, step _c10 is executed following step _c7 .

If it is determined in step _c10 that the time _t2 set by the A timer has not elapsed, step d is executed, and if the time _t2 has elapsed, following step _c10 , the outside air temperature T _A is It is checked whether T _a1 or more is reached (step c ₁₁ ). The outside temperature T _A
If T _a1 or more, following step c ₁₁ , it is checked whether the correction value T _s is equal to the predetermined value T _L1 (step c11).
c ₁₂ ), if they are equal, the correction value is set to the predetermined value T _L1 and step d is executed. When the correction value T _S is not equal to the predetermined value T _L1 in step c ₁₂ , that is, in this case, [T _L1 > T ₅ ], and following step c ₁₂ , the value obtained by adding ΔT _s to the correction value T _s Step d is executed with Tss as the new correction value _Tss . Therefore, in this case, when the outside air temperature T _A is equal to or higher than the predetermined value T _a1 , wait until the set time t ₂ of the A timer has elapsed from the time when the target correction value T _s ' increases, and the correction value T _s becomes ΔT. is increased by _s (step _c14 ) to a predetermined value.
At T _L1 , the increase stops and the state is limited to a predetermined value T _L1 . In this case, the time required to execute the entire routine is approximately constant, and ΔT _s is also fixed, so the correction value T _s is a slope determined by ΔT _s and the time required to execute the entire routine, and the predetermined value T _L1 , and is limited to a predetermined value T _L1 .

If the outside air temperature T _A is less than T _a1 in step c ₁₁ , it is checked whether the correction value T _s is larger than a predetermined value T _L2 (T _L1 > T _L2 ) (step c ₁₃ ), and the correction value T _{s is}
is not larger than the predetermined value T _L2 , the correction value T _s =
Step c15 until the predetermined value T _L2 is reached (step _c15 ).
c ₁₄ is executed. Therefore, in this case, when the outside air temperature T _A is less than the predetermined value T _a1 , the set time of the A timer starts from the time when the target correction value T _s ' increases.
Waiting until t ₂ has elapsed, the correction value T _s is increased by ΔT _s up to a predetermined value T _L2 , and at the predetermined value T _L2 , the increase stops and the correction value T s is limited to the predetermined value T _L2 . Moreover, the gradient at the time of this increase is as described above. In this embodiment, in step _c11 , a hysteresis of (T _a1 - T _{a2 )} is provided for determining the outside air temperature, where (T _a1 < T _a2 ).

Also, in step _c13 , the correction value T _s becomes [T _s >
When it _{is determined} that [ _{T s =}
T _L2 ]) steps c ₁₆ , c ₁₅ ).

Therefore, if the correction value T _s is not limited in FIG. 6b, it would change to the value shown by the broken line, but the upper limit is now limited to the value shown by the solid line.

When the solar radiation disappears, the target correction value in Figure 6 a
T _s ′ becomes a falling state, and in step _c5 ,
This is a case where it is determined that [target correction value T _s ′<correction value T _s ], and the correction value is decreased. In this case, the A flag is set following step _c5 (step _c17 ). Compatible with Coreha Step _C6 . Next, it is checked whether the B flag is set (step _c18 ), and if the B flag is set, timing of the B themer is started (step c18).
c ₁₉ ), the B flag is reset (step
_c20 ). Next, it is checked whether the time set by the B timer, for example, t ₁ (t ₁ >t ₂ ) seconds has elapsed (step c ₂₁ ). Steps c ₁₇ to _{c 21} are steps c ₆ to _{c 10}
, and the explanation thereof will be omitted as it is the same. If it is determined in step _c21 that time t ₁ second has not elapsed, step _c16 is bypassed and step d is executed, and if it is determined in step _c21 that time t ₁ second has elapsed, step c16 is executed.
Step d is executed via _c16 . As a result,
When the target correction value T _s ′ falls, the correction value T _s decreases with a delay of t ₁ second from the start of the fall of the target correction value T _s ′. Therefore, even if the response of the solar radiation sensor 51 is fast, it is possible to prevent the total data T from fluctuating.

(Effects of the Invention) As explained above, according to the present invention, the upper limit of the correction value due to solar radiation is limited by the outside temperature, and in the range where the upper limit of the correction value is not limited, the correction value due to the amount of solar radiation in winter and the amount of solar radiation in summer. The correction value is almost the same as the correction value, so it does not cause discomfort to the passengers, and the upper limit of the correction value prevents unnecessary correction in winter, so the blowout mode can also be changed to heat mode, bi-level mode, and vent mode. The frequency of switching is reduced, and the temperature of the blown air will no longer drop below an appropriate temperature that can maintain the temperature at your feet.

In addition, due to the directivity that exists when a photoelectric conversion element is used as a solar radiation sensor, even if the correction value is determined when the sun is located at a low altitude, the correction value is limited, so when the sun is located at a high altitude, No unnecessary excessive correction is made even when the

Furthermore, even if the inclination of the vehicle changes, excessive correction will not be made.

[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 the configuration of an embodiment of the present invention. 3 and 5 are flowcharts for explaining the operation of one embodiment of the present invention. FIG. 4 and FIG. 6 are diagrams for explaining the operation of one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Vehicle interior temperature detection means, 2... Vehicle interior temperature setting means, 3... Outside temperature detection means, 4... Solar radiation amount detection means, 5... Calculation means, 6... Temperature control means, 7... ...Limitsuta.

Claims (1)

[Claims] 1 Vehicle interior temperature detection means, vehicle interior temperature setting means, outside air temperature detection means, solar radiation amount detection means for detecting the amount of solar radiation received by the vehicle, and a signal related to the deviation between the detected vehicle interior temperature and the set vehicle interior temperature. and a calculation means for calculating the calculation output according to the detected outside air temperature and the detected amount of solar radiation, the output of the calculation means is used as a vehicle interior temperature control signal, and the temperature control means is controlled based on the signal. What is claimed is: 1. An air conditioner for a vehicle, characterized in that the air conditioner comprises a limiter that limits an upper limit of a correction value based on the detected amount of solar radiation, and that changes the upper limit based on the detected outside air temperature.