JPS6114002B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle air conditioning control method including solar radiation correction.

Conventionally, methods of this kind are known to detect solar radiation from the sun and control air conditioning elements to maintain a constant temperature inside the vehicle, or to increase the amount of air blown to soften the feeling of sunlight hitting the occupants. It is also known to use a heat-sensitive resistance element or a photoresistive element for solar radiation detection. Of these two detection elements, the one currently in use is one that uses a heat-sensitive resistance element placed in a position particularly exposed to sunlight inside the vehicle interior and utilizes the electrical signal. In addition to this, there is a problem in that the response to changes in the amount of solar radiation is slow, and when a vehicle enters or exits a solar radiation blocking area such as a tunnel, there is a delay in response to changes in the control amount of the air conditioning element.
On the other hand, when using a photoresistive element as seen in Publication of Utility Model Publication No. 48-6264, it is not affected by the temperature inside the vehicle, but the response to changes in solar radiation is too fast and the element may move into or out of the shadows of buildings, etc. There is also a drawback that the control amount of the air conditioning elements changes from time to time.
Although it is conceivable to simply electrically smooth the electrical signal of the photoresistive element to solve this problem, doing so has the disadvantage of causing a delay in response as described above.

In view of the above-mentioned problems, the present invention is not affected by the temperature inside the vehicle, and is capable of obtaining stable solar radiation data even when entering and leaving the shadows of buildings during normal daytime driving. It is an object of the present invention to provide an air conditioning control method that does not cause a response delay when entering and exiting a solar radiation blocking area such as a tunnel.

In order to achieve this objective, the present invention uses a photoresistive element to detect the amount of light surrounding the vehicle as an electrical signal, processes this detection signal in two ways, and obtains stable solar radiation data using one of them. On the other hand, it is characterized in that it is determined whether the vehicle enters or exits the solar radiation cutoff area, and the effect on the control of the solar radiation amount data is adjusted based on this determination signal.

The present invention will be described below with reference to embodiments shown in the accompanying drawings. In this embodiment, the present invention is applied to a generally known automobile air conditioner using a cold air/warm air mixing method. An outside air suction port 1a for internal air circulation and an internal air suction port 1b for internal air circulation are formed, and both suction ports are opened and closed by an internal and external air damper 2. Inside the ventilation duct 1, toward the downstream side, there are a blower motor 3,
An evaporator 4 that forms part of the cooling cycle cc, a heater core 5 that forms part of the cooling water cycle HC of the engine EG, and a temperature control damper that adjusts the ratio of air passing through the heater core 5 to air passing through its bypass passage 6. A/M dampers) 7 are arranged in order. At the most downstream part of the ventilation duct 11, upper and lower air outlets 1c and 1d are formed to blow out the temperature-controlled air in the duct to the upper and lower parts of the vehicle interior, and both air outlets are air outlets. It is designed to be opened and closed by a damper 8.

In order to perform temperature control and various operation mode controls, the control device 10 receives various information signals and executes processing based on a preset control program, and electrically controls the operation of the functional elements 1 to 8. It is something that gives specific instructions.

As a means for inputting various information signals to the control device 10, an inside temperature sensor 21 including a heat-sensitive resistor that generates an analog voltage signal corresponding to the temperature Tr inside the vehicle interior, and an analog voltage signal corresponding to the temperature Ta outside the vehicle interior. an outside temperature sensor 22 including a resulting heat-sensitive resistance;
a temperature setting device 23 including a potentiometer that generates an analog voltage signal according to the set temperature Ts (set position); an opening sensor 24 including a potentiometer that generates an analog voltage signal according to the opening degree Ar of the temperature control damper 7; A solar radiation sensor 25 including a photoconductive element that generates an analog voltage signal corresponding to the amount of light Ls ₁ that the vehicle receives from the surroundings, and a switch panel 11 that generates on/off signals by operating a group of switches such as operation, stop, and operation mode selection are provided. There is.

In addition, the engine EG is used as a means for operating functional elements according to electrical commands from the control device 10.
an electromagnetic clutch 31 that intermittents the driving force from to the cooling cycle cc, an electromagnetic valve 32 that opens and closes the cooling water circulation path to the heater core 5 in the heating cycle HC, an internal/external air damper 2, a temperature control damper 7, an outlet damper 8 Negative pressure actuators 33, 34, and 35 controlled by electromagnetic valves are provided to provide opening/closing driving force using engine negative pressure. The display panel 12 displays the operating status of the air conditioner and the control device based on the output signal of the control device 10.

The control device 10 receives power from the vehicle battery 14 when the ignition switch 13 of the vehicle is turned on, and becomes operational.

As shown in FIG. 2, the control device 10a includes a digital computer (microcomputer, e.g. MB8841 manufactured by Fujitsu Ltd.) 10a, which performs information processing based on a preset control program;
Analog input interface 10b selectively converts analog voltage signals from signal input means 21, 22, 23, 24, and 25 into analog and digital signals and inputs them to computer 10a, and shapes on/off signals for each switch from switch panel 11. digital input interface 10c which is input to the computer 10a, an amplifier circuit 10d which amplifies the operation command signals of the functional elements 3, 31 to 35 outputted from the computer 10a, an information processing clock generation circuit 10e, and a constant voltage circuit. , immediately after turning on the ignition switch 13, the computer 1
It consists of an initialization circuit (none of which is shown) that starts the operation of 0a.

3 and 4 show the flow of the control program of the computer 10a.
The operation of the device will be explained with reference to FIGS.

When the ignition switch 13 is turned on, the control device 10 becomes operational, and the digital computer 10a, which is a main component, starts executing the preset control program from step 100. Then, in the initial setting step 101, various variables (b, c,
Ls ₂ , Ls′, LsZ, N, Ms, Mso, etc. Computer 1
(allocated to memory addresses within 0a) are all set to 0. Subsequently, in step 102, the timer function of the computer 10a is started. Note that when the computer 10a is MB8841 manufactured by Fujitsu, the number of overflows may be counted using the built-in timer 1 counter in the memory RAM in the computer 10a. The timer is used to mask the correction based on the solar radiation data created by smoothing processing for a while (6 seconds) after the start of control, as will be described later.
Next, in a mode setting step 103, the operating state of the switch panel 11 is checked, and if the mode is the normal temperature control mode, the electromagnetic clutch 31 and the electromagnetic valve 32 are energized via the amplifier circuit 10d to perform the cooling cycle CC and the heating cycle. The cycle HC is brought into operation, and power is supplied to the blower motor 3 to create a ventilation state within the duct 1. Further, for example, an energizing signal is not applied to the negative pressure actuators 33 and 35, and the inside and outside air damper 2 and the outlet damper 8 are kept in the illustrated state. In addition, in this mode setting step 103, when the control mode is commanded by the switch panel 11 so that the inside/outside air damper or the outlet damper is in a specific open/close state, the negative pressure actuators 33, 35 are set accordingly. give an energizing signal to the

Next, in a data input step 104, the analog voltage signal necessary for temperature calculation is selectively converted into digital data and input via the interface 10b, and in step 104, the necessary temperature of the air to be blown into the vehicle interior is determined based on these input data. That is, the temperature adjustment amount Tao required to obtain the set temperature Tset is calculated. This calculation is expressed by the following equation.

Tao=Kset・Tset−Kr・Tr−Kam・Tam+C (1) However, Tset...Target temperature (set temperature) Tr...Interior temperature Tam...Outdoor temperature Kset, Kr, Kam, C...Preset temperature Constant indicating control gain Next, the process proceeds to solar radiation correction step 106, where the temperature adjustment amount Tao obtained in step 105 is corrected according to the solar radiation amount, and data A ₀ representing the target opening degree of the temperature adjustment damper 7 is obtained. Convert to This conversion is expressed by the following equation.

Ao=Tao+Ms (2) Here, the solar radiation correction term Ms is calculated by the timer interrupt routine shown in FIG. Note that the temperature is set to o for about 3 seconds after temperature control is started, and no correction is made.

Next, determination steps 107, 108 and energizing/deenergizing steps 109, 110, 11 of the negative pressure actuator 34 are performed.
1, the damper opening Ar at that time is the target opening.
Target area centered around Ao (Ao−ao) to (Ao+
ao), and depending on the determination result, an electric signal indicating whether the damper opening degree is large, small, or stopped (maintained) is outputted via the amplifier circuit 10d. Here, "the damper opening degree is large" means that the upstream side of the bypass passage 6 in FIG. 1 is opened more widely,
"The damper opening degree is small" refers to a state in which the upstream side of the heater core 5 is opened more widely. When the amount of solar radiation is detected, the target opening degree Ao is increased by the correction term Ms, and in step 109, the "damper opening degree is set to be large", and the amount of air passing through the bypass passage 6 increases, making it cooler. Air is blown into the passenger compartment. Steps 103 to 111 are cyclically and repeatedly executed.

The timer interrupt routine in Figure 4 is executed by computer 1.
It shows the flow of calculations processed based on an interrupt signal applied from the clock generation circuit 10e at a period of 50 milliseconds to the external interrupt terminal IRQ of 0a. When this interrupt processing is accepted in the start step 200, first in the data input step 201, the analog voltage signal of the solar radiation sensor 25 is inputted as a digital value representing the amount of solar radiation _Ls1 via the interface 10d.

Next, in step 202, the deviation a from the previous input (50 milliseconds ago) of the amount of sunlight Ls ₂ (0 for the first time) is calculated, and in step 203,
A total value A of deviations b and c calculated two times before is calculated. This total deviation value A is used in determination steps 214 and 218, which will be described later, to determine the fall and rise of the amount of solar radiation.

Steps 205 to 212 are for smoothing the input amount of sunlight, and the average value of the amount of sunlight Ls ₁ input for 128 times, that is, about 6 seconds, is calculated every 200 milliseconds, and the process is further advanced. Steps 205, 206, 2
07 and 212 are steps for calculating the four totals of the amount of solar radiation Ls ₁ , step 208 is a step for calculating the average of the total values, and steps 209 and 210.
and 211 is a step to obtain Tsun (solar radiation amount data) from the average value of 128 times.

In determination step 213, it is determined whether 6 seconds have not elapsed since the timer was turned on (started) (YES) or has passed (NO), and if YES, step 2 is immediately executed to mask the solar radiation correction.
Proceed to step 22. In step 222, the new amount of solar radiation is
Replace Ls ₁ with the previous value Ls ₂ and also in step 22
In 3, the previous deviation b is changed to the deviation c from the previous time,
In step 224, deviation a is replaced with the previous deviation b in preparation for the next interrupt process, and in return step 225, the main control program is returned to the interruption point.

Judgment steps 214 and 215 are steps for judging whether the vehicle enters the solar radiation blocking area, and step 21
In step 4, it is determined whether the solar radiation amount has suddenly decreased depending on whether the total deviation value A of the solar radiation amount is larger than the set value a, and in step 215, the solar radiation amount at that time is determined.
It is determined whether Ls ₁ has decreased to below the set value β, and if both determinations are YES, the process proceeds to step 216. In step 216, a plug indicating whether or not the vehicle is in the solar radiation shielding area is turned on, indicating that the vehicle is in the solar radiation shielding area. When this plug is turned on, judgment step 204 is executed from the next interrupt processing.
If the result is YES, the arithmetic processing branches to step 218. In step 217, the solar radiation correction term is set to o, and step 106 of the main control routine in FIG.
This effectively stops solar radiation correction.

Furthermore, if the judgment result in either judgment step 214 or 215 is NO, and therefore the solar radiation blocking area has not been entered, the process proceeds to step 221 and the solar radiation correction parameter is determined.
Calculate Ms using the following formula.

Ms=Ksun・Tsun (3) However, Ksun is a constant indicating control gain and determines the correction amount of the temperature adjustment amount Tao according to the solar radiation data Tsun.

Steps 218 and 219 are steps for determining whether the vehicle leaves the solar radiation blocking area.
In step 219, it is determined whether the amount of solar radiation has increased rapidly based on whether the total deviation value A of the amount of solar radiation is smaller than the set value -a, and in step 219, the amount of solar radiation at that time is determined.
It is determined whether Ls ₁ is greater than or equal to the set value r, and if both determinations are YES, the process proceeds to step 220. In step 220, the flag is turned off to indicate that the vehicle is out of the solar radiation shielding area. Next, the process proceeds to step 221, where the solar radiation correction term Ms is calculated and the solar radiation correction is restored. At this time, the solar radiation data Tsun is
Since the data when the flag was turned on in step 16 is stored as is, the solar radiation correction term Ms is first determined based on the stored data. After that, the smoothing process of steps 205 to 212 is executed, so that the solar radiation data Tsun is advanced according to the actual solar radiation amount, and an appropriate solar radiation correction term Ms is obtained.

Incidentally, if the judgment result in either judgment step 218 or 219 is NO, and therefore the vehicle is within the solar radiation cut-off area, the process proceeds to step 222 and then to return step 225. Therefore, solar radiation data
Tsun continues to be stored as memory data.

Solar radiation correction term by the interrupt processing routine in Figure 4
The calculation of Ms is shown in Figure 5 as a time chart. Before the vehicle enters the solar radiation shielding area, that is, Fig. 5 1
When it is “outside”, the input solar radiation amount Ls ₁
(Fig. 5, 2) is smoothed in steps 205 to 212 to create solar radiation data Tsun (Fig. 5, 3), and in step 221, the solar radiation correction term Ms is calculated according to the solar radiation data Tsun. Figure 5). At this time, the amount of solar radiation Ls ₁ changes slowly, or the amount of change is small, or the amount of solar radiation sensor 2
Even if electrical noise is induced in the signal line from 5 and causes an instantaneous change, the solar radiation correction term Ms is stably determined because a negative determination is made in either determination step 214 or 215.

When the vehicle enters the solar radiation blocking area at point P, if the amount of solar radiation Ls ₁ suddenly decreases below the set value, the flag is turned on in step 216 after passing through determination steps 214 and 215 (FIG. 5, 4), and then in step 217.
At this point, the solar radiation correction term Ms is fixed to o, the solar radiation correction is stopped, and the solar radiation amount data Tsun is stored as is as storage data Tsun'. When the amount of solar radiation before point P is small, the amount of change is also small, so it is not determined that the solar radiation blocking area has entered.

When the vehicle exits the solar radiation blocking area at point Q, the flag is turned off in step 220 after passing through determination steps 218 and 219, and the stored data is initially
The solar radiation data Tsun, which includes Tsun′ and thereafter gradually changes according to the input solar radiation amount Ls ₁ , is calculated and used as the solar radiation correction term Ms for the solar radiation correction of the temperature adjustment amount Tao.

Note that the above-mentioned embodiment is an example of the embodiment of the method of the present invention, and several modifications can be made within the scope of the gist of the present invention. An example is shown below.

(1) The stored data when resuming solar radiation correction due to vehicle exit does not have to completely match the solar radiation data at the time of vehicle entry, and even if the data is determined in stages according to the solar radiation data at vehicle entry. Alternatively, the data may simply be data indicating whether or not there has been solar radiation that requires considerable solar radiation correction.

(2) When the solar radiation correction data at the time of the vehicle approach is sufficiently large, the solar radiation correction may be restarted by making the stored data at the time of restarting the solar radiation correction smaller by an appropriate value than the solar radiation correction data at the time of the vehicle approach. According to this, when the vehicle remains in the solar radiation cut-off area for a long time, there is a high possibility that the solar radiation at the time of exit has changed, so that follow-up control can be performed relatively quickly in that case as well.

(3) To determine whether a vehicle enters or exits a solar radiation cutoff area, instead of checking the slope of the change in the amount of solar radiation itself, it is possible to determine whether a vehicle enters or exits a solar radiation cut-off area. Entry may be determined when the input amount of sunlight exceeds the set value several times in a row, and exit may be determined when the input amount of sunlight exceeds the set value several times in succession. Alternatively, it may be determined whether there is a sudden change in the amount of solar radiation based on the magnitude of the slope of the smoothed solar radiation amount data.

(4) As a safety measure against erroneous determination of exit from the solar radiation blocking area, for example, if the flag is on for more than a few minutes, the flag may be forcibly turned off.

(5) In addition to solar radiation correction by temperature control, when the device operates on the cooling side, the blower motor 3
The amount of air blown may be increased.

(6) Depending on the judgment result of entering or exiting the solar radiation cut-off area, an internal/external air damper may be operated to force internal air circulation, or it may be output as a signal to turn on or off the vehicle's headlights. good.

As described above, in the present invention, the amount of solar radiation received by a vehicle is detected as an electrical signal, the amount of solar radiation data is obtained by smoothing the signal, and the solar radiation cut-off area of the vehicle is determined based on the degree of change in the amount of solar radiation. approach,
It determines the exit and adjusts the solar radiation correction control.
It is not affected by the temperature inside or outside the vehicle, and when the change in the amount of sunlight received is small, such as when entering and leaving the shadow of a building, it is possible to obtain data on the amount of sunlight that changes slowly. enter the area,
This provides an excellent effect in that there is no response delay in correction control when exiting.

[Brief explanation of the drawing]

Figure 1 is an overall configuration diagram of an air conditioning control device to which the method of the present invention is applied, Figure 2 is a block diagram showing the electrical control system, and Figures 3 and 4 are the main components of the electrical control system. These are operation flowcharts showing the control program of a digital computer, in which Fig. 3 shows the main control routine, Fig. 4 shows the interrupt processing routine, and Fig. 5 shows the interrupt processing routine.
The figure is a time chart for explaining the operation. 7...Temperature control damper as an air conditioning element, 1
0...Control device, 25...Solar radiation sensor, 106...Solar radiation correction step, 201...Solar radiation amount input step, 205-212...Smoothing processing step, 214, 215...Entry determination step, 21
7,221...Solar radiation correction term calculation step, 218,
219...Exit judgment step, _Ls1 ...Input value of solar radiation amount, Tsun...solar radiation amount data, Tsun'...memorized data, Ms...solar radiation correction term.

Claims (1)

[Claims] 1. In a vehicle air conditioning control method that controls air conditioning elements according to various control conditions including data indicating the amount of solar radiation on the vehicle, the amount of light that the vehicle receives from the surroundings is detected as an electrical signal, and this detected signal is Smoothing processing is performed to create solar radiation amount data as the control condition, and the entry and exit of the vehicle into the solar radiation cut-off area is determined based on the sudden fall and rise of the detection signal, and when the entrance is determined, then Data corresponding to the amount of solar radiation is stored as storage data, and the amount of solar radiation data is removed from the control conditions, and when the exit is determined, the amount of solar radiation data that temporarily includes the stored data is restored to the control conditions. A vehicle air conditioning control method.