JPS6342649Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in a device for controlling the amount of air blown into a vehicle interior by adjusting the rotational speed of a blower in an air conditioner for an automobile.

As this type of air volume control device, for example, JP-A-56
As shown in Publication No. 146416, the target air volume is calculated according to a predetermined control pattern using the overall signal T as a parameter, and the rotation speed of the blower is adjusted to achieve the calculated target air volume. An example of this control pattern is shown in FIG. 1.

Here, the total signal T is expressed as T=tr+ata+bts+ctm-dtd+A, where tr is the temperature inside the car from the inside temperature sensor, ta is the outside temperature from the outside temperature sensor, and ts is the temperature corresponding to the amount of solar radiation from the solar radiation sensor. tm is the temperature of the air passing through the evaporator from the mode sensor, td is the set temperature from the temperature setting device, a, b,
c and d are gains of each sensor or setting device, and A is a correction value. This comprehensive signal T comprehensively determines the amount of heat _load on the air conditioner, and _is
If it falls between the two, the target air volume Q is set to the lowest value, "Low." Therefore, when entering between this predetermined zone T ₁ and T ₂ ,
Since it is possible to reduce noise and energy consumption while maintaining a good air conditioning feeling, this predetermined zone T ₁ to T ₂ is made as wide as possible, and before and after the predetermined zone T ₁ to _{T 2} , In order to achieve a stable state as quickly as possible, the rate of increase/decrease in the target air volume Q is made relatively large.

However, in such a control pattern, even during cool-down or warm-up, or when the set temperature is changed significantly, the predetermined zone T ₁ to _{T 2} is entered early, so the increase in air volume reduces the heating and cooling of the occupants. I felt a lack of emotion. That is,
Conventionally, the air volume is always controlled according to one control pattern, so even when a large disturbance occurs, only uniform control is possible.
It was not possible to fully satisfy the passenger's desire for air volume control.

Therefore, this idea has been developed to solve the conventional drawbacks caused by controlling the air volume according to one control pattern, and to create an air volume control device for an automobile air conditioner that can fully satisfy the passenger's desire for air volume control. The structure for achieving this goal is shown in FIG. 2.

That is, in FIG. 2, the air volume control device according to this invention has a first target air volume calculation means 60a and a second target air volume calculation means 60a.
The first target air volume calculation means 60a has a control pattern in which the target air volume changes according to the difference between the inside temperature and the set temperature. The minimum air volume is reached at the point where the difference between the vehicle interior temperature and the set temperature is zero, and as the absolute value of the difference between the vehicle interior temperature and the set temperature increases, the target air volume increases toward the maximum air volume. The maximum air volume is reached at the point where the absolute value of The target air volume calculation means 60b has a control pattern in which the target air volume changes according to the magnitude of the overall signal based on at least the interior temperature and the set temperature, and the target air volume is determined to be the lowest air volume in a predetermined area of the overall signal including the zero point of the overall signal. The target air volume increases toward the maximum air volume as the overall signal increases or decreases before and after the predetermined area of the overall signal, and the air volume reaches the maximum at the predetermined value of the overall signal in each area. , the target air volume is calculated based on the control pattern by inputting output signals from at least the temperature setting device 27 and the vehicle interior temperature sensor 23. Furthermore, an in-vehicle temperature level determining means 50 is provided which compares the deviation of the output signal values from the temperature setting device 27 and the in-vehicle temperature sensor 23 with a predetermined value to determine the level of the in-vehicle temperature. Further, the control means 70 determines whether the first target air volume calculation means 60a or the second target air volume calculation means 60a or the second
One of the target air volume calculation means 60b is selected and the rotational speed of the blower 5 is adjusted so as to reach the target air volume.

Therefore, if the level of temperature inside the vehicle differs, the target air volume is calculated according to a different control pattern in the first target air volume calculation means 60a or the second target air volume calculation means 60b, and the blower is adjusted to reach the target air volume. Since the rotational speed of No. 5 is adjusted, during the above-mentioned cool-down or warm-up, or when there is a large disturbance such as changing the set temperature, the air volume can be controlled accordingly, thus achieving the above object. It is something that can be done.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 3, an embodiment of the invention is shown,
An air conditioner for an automobile is formed in such a way that an inside air inlet 2 and an outside air inlet 3 are split into two on the most upstream side of an air conditioning case 1, and an inside/outside air switching door 4 is installed in the divided part.
is provided, and the air to be introduced into the air conditioning case 1 can be selected between inside air and outside air using this inside/outside air switching door 4.

The blower 5 is for sucking air into the air conditioning case 1 and blowing it to the downstream side, and an evaporator 6 and a heater core 7 are provided on the downstream side of the blower 5. The evaporator 6 constitutes a cooling cycle together with a compressor 8 and the like connected to the engine 9 via an electromagnetic clutch 8a, while the heater core 7 is inserted into the hot water circuit of the engine 9 and generates air using the cooling water of the engine 9 as a heat source. It's starting to heat up.

An air mix door 10 is provided in front of the heater core 7, and the ratio of air sent to the heater core 7 and air that bypasses the heater core 7 is adjusted depending on the opening degree of the air mix door 10.

The rear end of the air conditioning case 1 is divided into a defrost outlet 12, a vent outlet 13, and a heat outlet 14, which open into the vehicle interior 15, and mode doors 16, 17 are provided in the separated parts. By opening and closing the mode doors 16 and 17,
It can be switched to vent mode, bilevel mode, heat mode, or defrost mode.

The inside/outside air switching door 4 and the air mix door 10
The mode doors 16 and 17 are operated by actuators 18a to 18c, respectively, and the actuators 18a to 18c are operated by a drive circuit 19a.
-19c based on the output signal from the microcomputer 20. Further, the rotational speed of the blower 5 and the on/off of the compressor 8 are similarly controlled based on output signals from the microcomputer 20 via respective drive circuits 19d and 19e.

The microcomputer 20 is a central processing unit.
The microcomputer 20 is a known device that includes a CPU, a read-only memory ROM, a random access memory RAM, and a clock generator that generates reference pulses with a crystal oscillator 21. The microcomputer 20 includes a multiplexer and an A-D converter. Each input data is inputted via an input interface 22 consisting of. This input data includes the vehicle interior temperature Tr from the vehicle interior temperature sensor 23, the outside air temperature Ta from the outside temperature sensor 24, and the solar radiation sensor 25.
solar radiation data Ts from the mode sensor 26, air temperature Tm immediately after passing through the evaporator 6 from the mode sensor 26,
The set temperature Td from the temperature setting device 27 and the opening degree θ of the air mix door 10 from the potentiometer 28 are included. Furthermore, the temperature of the cooling water of engine 9
On/off data of the water temperature switch 29 that detects Tw is input, and these input data are appropriately processed by the microcomputer 20 to control each of the control devices.

Next, the first example of the control operation of the microcomputer 20 will be explained based on FIG. Enter each data mentioned above.

Then, the process proceeds to the next step 32, in which it is determined from the on/off signal of the water temperature switch 29 whether the temperature Tw of the cooling water of the engine 9 has risen to a predetermined value or more. When the water temperature switch 29 is on and the temperature is low, the heating ability of the heater core 7 is still insufficient, so step 35 is performed.
Go to and set the target air volume Q to the lowest setting, "Low." On the other hand, when the water temperature switch 29 is turned off and the temperature Tw of the cooling water of the engine 9 rises above a predetermined value, the process proceeds to the next step 33.

In this step 33, the difference between the set temperature Td and the vehicle interior temperature Tr is determined, and this difference is, for example, 8°C.
If the temperature falls below 12°C, it is determined to be "A", and if it rises to, for example, 12°C or more, it is determined to be "B". If it is determined to be "B", it means that the heating capacity of the heater core 7 has not yet increased sufficiently in the heat mode, so it is possible to prevent the air volume from suddenly increasing and causing discomfort to the occupants. To do this, step 3
Proceed to step 6 and set the target air volume Q to the intermediate “Med”. On the other hand, if the determination is "A", the process advances to the next step 34.

In this step 34, the deviation |Td-Tr| between the set temperature Td and the vehicle interior temperature Tr is determined, and this deviation is compared with predetermined values α and β. The predetermined values α, β
is α<β, and the deviation |Td−Tr| exceeds the predetermined value β during cool-down or warm-up, or during a transition period when the set temperature Td is significantly changed, and when it enters a stable period, it becomes less than the predetermined value α. It is determined that it will become. If the deviation |Td-Tr| is determined to be "D" which has increased above the predetermined value β, the process proceeds to step 37, and if it is determined to be "C" which has decreased to the predetermined value α or less, the process proceeds to step 38. Step 34 constitutes the vehicle interior temperature level determining means 50 shown in FIG.

In step 37, the target air volume Q is calculated in accordance with the control pattern programmed as SUB, for example, as shown by the dotted line in FIG. This control pattern is based on the difference Tr− between the vehicle interior temperature Tr and the set temperature Td.
Td is used as a parameter, and as the vehicle interior temperature Tr approaches the set temperature Td, the target air volume Q is gradually lowered, and is set to be "Low" when the temperature becomes almost equal. On the other hand, in step 38, the target air volume Q is calculated in accordance with the conventional control pattern programmed as SUB.
When the processing of steps 36 to 38 is completed, the process proceeds to step 39, where a control signal is sent to the drive circuit 19d, the rotational speed of the blower 5 is adjusted to obtain the respective target air volume Q, and the process proceeds to the next step 40.
This will return you to the main routine.

Therefore, during cool-down or warm-up, or during a transition period when the set temperature Td is greatly changed, control is performed according to the SUB control pattern, so the rate of decrease in air volume is small and the "Low"
It takes a long time for the air conditioner to reach this point, and as a result, the feeling of cooling and heating becomes stronger. Then, when the vehicle interior temperature Tr gradually approaches the set temperature Td and becomes |Td−Tr|≦α (α≒0 in this example), the control pattern shifts to the SUB control pattern and normal stable control is performed. At steps 37 and 38, the target air volume calculation means 60a and 60b shown in FIG.
However, the control means 70 is constituted by the step 39 and the drive circuit 19d.

In FIG. 6, the microcomputer 2
A second control operation example of 0 is shown, and this second control operation example is compared with the first control operation example above.
Step 4 is inserted between step 33 and step 34.
The difference is that 1 was inserted. In this step 41, it is determined whether or not the blowing mode is the heat mode. If the blowing mode is the heat mode, step 38 is performed.
If the mode is not the heat mode, the process proceeds to step 34. That is, if the SUB is controlled in the heat mode, the degree of heating will become too large, so this is prevented and appropriate control is performed.

Further, in FIG. 7, a third example of control operation of the microcomputer 20 is shown, and in this third example of control operation, when compared with the first example of control operation, there is a difference between step 33 and step 34. The difference is that step 42 is inserted. This step 42
, the temperature Ts corresponding to solar radiation and the temperature inside the car
Tr (i.e., the relative amount of solar radiation with respect to the vehicle interior temperature Tr), and set this to predetermined values γ, δ (however,
γ<δ), if the difference is determined to be “F” with a large amount of solar radiation that has increased to a predetermined value δ or more,
The process proceeds to step 37 in order to increase the air volume to emphasize the feeling of cooling, and if it is determined that the solar radiation amount is small and the difference has fallen below a predetermined value γ, the process proceeds to step 34.

As described above, according to this invention, the first target air volume calculation means has a control pattern in which the target air volume changes according to the deviation between the set temperature and the inside temperature of the car. and a second target air volume calculation means having a control pattern in which the target air volume changes according to a comprehensive signal based on the set temperature and the interior temperature of the vehicle, etc., and the control pattern of the first target air volume calculation means is based on the set temperature and the interior temperature The air volume is the lowest only at the point where the temperature deviation becomes zero, and at other points, as the absolute value of the deviation increases, the target value is set higher than the control pattern of the second target air volume calculation means, and its rate of change is smaller. Since one of the first target air volume calculation means and the second target air volume calculation means is selected, it is possible to fully satisfy the passenger's desire for air volume control. When the amount of air is changed significantly, the first target air volume calculation means is selected, and as a result, the rate at which the air volume decreases can be kept high, and the feeling of cooling and heating can be emphasized. In addition, by changing the control pattern in this way, it is possible to counter various disturbances, and in some cases, the time required to reach the set temperature can be shortened, increasing the degree of freedom in control. It is something that can be made larger.

[Brief explanation of the drawing]

Fig. 1 is a characteristic diagram showing the control pattern in a conventional air volume control device, Fig. 2 is a block diagram of this invention, Fig. 3 is a block diagram of an embodiment of this invention, and Fig. 4 is a diagram showing the control pattern of a conventional air volume control device.
The figure is a flowchart showing the first control operation example of the microcomputer used in the above, Fig. 5 is a characteristic diagram showing the control pattern in the same, and Fig. 6 is the second control of the microcomputer used in the above. FIG. 7 is a flowchart showing an example of the operation, and FIG. 7 is a flowchart showing a third example of the control operation. 5...Blower, 23...In-vehicle temperature sensor, 27
...Temperature setting device, 50...In-vehicle temperature level determination means, 60a...First target air volume calculation means, 60b
. . . second target air volume calculation means, 70 . . . control means.

Claims (1)

[Claims for Utility Model Registration] A control pattern in which the target air volume changes according to the difference between the inside temperature of the car and a set temperature, wherein the air volume is the lowest at a point where the difference between the inside temperature of the car and the set temperature is zero; As the absolute value of the difference between the temperature and the set temperature increases, the target air volume increases toward the maximum air volume, and the maximum air volume is reached when the absolute value of the difference between the vehicle interior temperature and the set temperature reaches a predetermined value. a first target air volume calculation means for calculating a target air volume based on the control pattern by inputting the output signals of the temperature setting device and the vehicle interior temperature sensor; and a comprehensive signal based on at least the vehicle interior temperature and the set temperature. is a control pattern in which the target air volume changes depending on the magnitude of the total signal, and the air volume is the lowest in a predetermined area of the overall signal including the zero point of the overall signal, and as the overall signal increases or decreases before and after the predetermined area of the overall signal. The target air volume increases toward the maximum air volume, has a maximum air volume at a predetermined value of the overall signal in each region, and inputs output signals from at least a temperature setting device and a vehicle interior temperature sensor. a second target air volume calculation means for calculating a target air volume based on the control pattern; and determining the level of the vehicle interior temperature by comparing the deviation of the output signal values from the temperature setting device and the vehicle interior temperature sensor with a predetermined value. and selecting either the first target air volume calculation means or the second target air volume calculation means according to the determination result of the inside temperature level determination means, and controlling the blower so that the target air volume is achieved. An air volume control device for an automobile air conditioner, comprising: a control means for adjusting the rotation speed;