JPH0422721B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an automatically controlled air conditioner, and particularly to improved control of demist mode.

(Prior Art) Generally, the number of revolutions of a blower motor is arbitrarily selected by a driver by operating a switch, or automatically controlled by a controller.

Examples of this automatic control include:
NISSAN Service Bulletin No. 484 by Sedryk Gloria, pages 435-453 [June 1981 Issue Publisher:
The device described in Nissan Motor Co., Ltd.] is known, and such a device is known as a potentiometer control ( Control to achieve the set temperature in the vehicle cabin based on the set temperature set by the PTC (hereinafter referred to as PTC) and signals sent from sensors such as the solar radiation sensor, inside air sensor, outside air sensor, water temperature sensor, and intake temperature sensor. It is becoming more and more common to do this. Furthermore, as stated on page 449 of the bulletin, air volume control compares the set temperature set by the PTC and the room temperature obtained by the indoor air sensor, and when this temperature difference becomes smaller, the air volume is reduced. It is under strict control.

(Problem to be Solved by the Invention) By the way, in such an air conditioner, in order to remove fog from the window glass, the air outlet is placed on the defroster side, or the defroster side and the floor side, In addition, a mode called a demist mode for controlling the temperature of the blown air is set.

However, with such conventional devices, even when the demist mode is set, the normal air volume control that lowers the rotation speed when the cabin temperature approaches the set temperature is read, resulting in the following problems. Ta.

In other words, if you select this demisting mode when the rotation speed of the blower motor is in a low state due to arbitrary selection or automatic control, the blower motor will remain at a low rotation speed. Therefore, there was a problem that the fogging on the glass could not be quickly removed by the demist mode, and the effect of the demist mode could not be exhibited.

In addition, as mentioned above, the state where the blower motor is at a low rotation speed is a desirable state for bringing the room temperature close to the set temperature when it is controlled automatically, and on the other hand, it is a state where the blower motor is at a low rotation speed when it is controlled automatically. If this is the case, the blower speed may be set to a low speed because the strong airflow is uncomfortable or the noise from the blower motor interferes with having a conversation or listening to music. Therefore, it is preferable to return to the original low rotation speed after the car window is defogged, but this operation is troublesome.

The present invention solves the above problems of the prior art,
A sufficient demisting effect can be expected even when switching to demisting mode when the rotational speed of the blower motor is within the low rotational speed range, and moreover, if defogging is achieved without the need for troublesome operations by the passenger, the original state will be restored. It is an object of the present invention to provide an automatically controlled air conditioner in which the rotation speed of a blower motor is returned to a low rotation speed, and at the same time, a sudden change in the rotation speed of a blower motor that causes discomfort to an occupant does not occur.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the automatic control air conditioner of the present invention includes a detection means for detecting a physical environmental factor related to temperature and outputting it as an electric signal;
a blower motor whose rotation speed is controlled by an output from a motor control circuit to adjust the amount of air blown;
A switching actuator that is driven to open and close a door related to air outlet switching that blows out air, an air mix door opening adjustment actuator that is driven to adjust the opening of the air mix door to adjust the air blowing temperature, and an air conditioning environment in the vehicle interior. It is a means to send an electric signal according to the setting operation by the passenger to set the temperature, and it defogs the car window based on the drive of the switching actuator while controlling the temperature to the set temperature based on the drive of the air mix door opening adjustment actuator. a setting means having a demist switch for forming a demisting mode in which a predetermined air outlet is opened in order to In order to set the motor control circuit,
an arithmetic and control device that sends a command signal to a switching actuator and an air mix door opening adjustment actuator; When the rotation speed is within the range, the rotation speed of the blower motor is increased to a high rotation speed higher than a predetermined rotation speed for a certain period of time, and then a command signal is outputted to gradually reduce the rotation speed to the original rotation speed. And so.

(Function) The automatically controlled air conditioner of the present invention operates as described below.

For example, if the passenger arbitrarily selects the low speed rotation mode due to consideration of blower motor noise, or if the air conditioning is in automatic mode and the temperature environment set by the passenger is almost achieved. A command signal for rotating the blower motor at a low rotation speed is output from the arithmetic and control unit to the motor control circuit.

If the demist switch is turned on when the blower motor is running at a low rotational speed, the arithmetic and control unit increases the rotational speed of the blower motor to a predetermined high rotational speed for a certain period of time, and then returns to the original rotational speed. A command signal is output to the motor control circuit in order to gradually return to the number of motors.

As a result, the blown air volume is increased for a certain period of time, and then the original rotation speed is gradually restored.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Note that the same reference numerals in each figure indicate the same objects.

FIG. 1 is a system diagram showing an embodiment of the present invention.

According to the figure, a system chamber 10, a drive device 20, a detection/setting section 30 including a detection means, a setting means, etc., and an arithmetic and control device 40 are shown separately.

The system chamber 10 includes an outside air introduction duct 1
1, inside air introduction duct 12, inside/outside air switching door 13,
Blower motor 14, evaporator 15, heater core 16, air mix door 17A, 17B, 17C
It also includes a floor door 18A, a defroster door 18B, and a ventilator door 18C. The system in the figure is for each door 17A to 17C, 18A to 1.
By opening/closing and opening degree of 8C, foot outlet A, ventilator outlet B,
Control (two-layer blowout control) for adjusting the airflow volume and blowout temperature from the defroster outlet C is executed.

The outside air introduction duct 11 is a duct for introducing air outside the vehicle interior, and the inside air introduction duct 12 is a duct for reintroducing air inside the vehicle interior. Or, choose whether to take in air from 12 or from both ducts 11 and 12.

The blower motor 14 blows out air introduced from the ducts 11 and 12 into the vehicle interior. An evaporator 15 is disposed immediately after the blower motor 14 to form cold air.

The heater core 16 forms warm air based on engine cooling water, and is used to generate warm air based on engine cooling water.
The mixing ratio of the cold air from the evaporator 15 and the warm air that has passed through the heater core 16 is adjusted by the opening degree of 7C. This mixing of cold air and warm air is carried out in both the first air mixture chamber D and the second air mixture chamber E downstream of the warm air outlet 16b of the heater core 16 (downstream of the air flowing in the system chamber 10). be exposed.

Note that this mixture of cold air and warm air may be mixed in the first air mix chamber D, depending on the opening/closing and opening degrees of the air mix doors 17A to 17C, floor door 18A, defroster door 18B, and ventilator door 18C.
This may be performed only on either side of the second air mix chamber E.

In addition, 19 is the first air mix chamber D and the second air mix chamber D.
16a is an air intake port of the heater core 16, 51 is a first cold air passage, 52 is a second cold air passage,
53 is a first hot air passage, and 54 is a second hot air passage.

Then, the opening degrees of the air mix doors 17A to 17C are adjusted appropriately, and both air mix chambers D and E are opened.
For example, the ventilator door 18
C, the floor door 18A is driven to open the ventilator outlet B and the foot outlet A, and the ventilator outlet B blows more cold air than the foot outlet A, making it possible to control head cold and foot heat. Close at 18C and defroster outlet C
Open the floor door 18A, and open the foot air outlet A.
By opening the door, you can heat your feet while keeping the windshield from fogging up. Note that it is also possible to open only one of the air outlets. For example, in the initial stage of defrosting the windshield, if the ventilator outlet B is closed by the ventilator door 18C (defroster outlet C is open), the defroster door 18B is opened, and the floor door 18A is closed, all the air will flow from the defroster outlet C. It's blown out. The control of the air conditioning system described above is called double-layer blowout control.
It is known from the publication No. 130809.

In addition, each element 13, 14, 17A to 17C, 18
A to 18C are operated by a passenger or automatically, and are referred to as "operating elements" in this specification as necessary.

The drive device 20 is for driving the aforementioned temperature-related operation elements 13, 14, 17A to 17C, and 18A to 18C, and includes an internal/external air switching actuator 21 for an internal/external air switching door, a motor control circuit 22, Air mix opening adjustment actuator 2
3 and each door 18A to 18 related to air outlet switching
It is equipped with an air outlet switching actuator 24 that opens and closes the air outlet. The inside/outside air switching actuator 21 drives the inside/outside air switching door 13 in a predetermined switching direction based on the command signal CC1. The motor control circuit 22 controls the rotation speed of the blower motor 14 based on the command signal CC2.

Air mix door opening adjustment actuator 23
is a command signal for air mix doors 17A to 17C.
It is driven to an appropriate opening degree including fully open and fully closed by CC3. The air outlet switching actuator 24 opens and closes the doors 18A to 18C in response to a command signal CC4, and selectively opens and closes the air outlet as described above.

The detection/setting section 30 is a detection means that detects physical environmental factors related to temperature and outputs them as electrical signals, and sends out electrical signals according to setting operations by the occupant to adjust the environment in the vehicle interior related to temperature. and other means.

As the detection means, an outside temperature sensor 31 that detects the temperature of outside air and outputs an electric signal SS1, and a vehicle room temperature sensor 32 that detects the temperature inside the vehicle interior and outputs an electric signal SS2 are provided. Note that an outlet temperature sensor that detects the temperature of the air blown from each outlet and outputs an electric signal, and a solar radiation sensor that detects the amount of solar radiation and outputs an electric signal may be provided.

As setting means, a temperature setting switch 35 is provided to set a desired vehicle interior temperature, and a demist switch 37 is provided to select a demist mode to defog the window glass. The temperature setting switch 35 outputs an electric signal CS in accordance with a setting operation, and the demist switch 37 outputs electric signals DS1 and DS2 in accordance with a closing operation. this signal
The air outlet switching actuator 24 is driven by the DS2, so that air is blown from at least the defroster air outlet C.

Other means are an AD converter 38 and a temperature display device 39. The AD converter 38 converts the analog signals of the sensors 31 to 34 into digital signals for post-processing. The temperature display device 39 displays the temperature set by the temperature setting switch 35, and various methods such as segment display using fluorescent tubes, LEDs, liquid crystals, etc. are possible.

In this specification, "physical environmental factors related to temperature" may include not only temperature but also the amount of solar radiation, and may also include humidity and the like.
Further, factors that affect the temperature inside the vehicle, such as vehicle speed, may be included as necessary.

The arithmetic and control device 40 sends command signals CC1 to CC4 based on signals SS1, SS2, CS, DS1, and DS2 from the detection means, setting means, etc., and creates an optimal environment in the vehicle interior. That is, by controlling the switching direction of the inside/outside air switching door 13, the rotation speed of the blower motor 14, the opening degree of the air mix doors 17A to 17C, and the opening/closing state of each door 18A to 18C, using the command signal of the arithmetic and control device 40, This allows optimal air to be delivered into the vehicle interior.

The configuration of the portions of this arithmetic and control device 40 that are relevant to the present invention is as shown in FIG. According to the figure, an indoor target temperature calculation circuit 41, an indoor temperature difference calculation circuit 42, an air volume calculation circuit 43, and an air volume change circuit 44 are shown.

The indoor target temperature calculation circuit 41 is connected to the outside temperature sensor 3
Based on the outside temperature signal SS1 given by 1,
In order for the vehicle interior temperature to approach the set temperature, it is calculated at what temperature the air should be blown into the vehicle interior (target blowout temperature). This target outlet temperature signal is
It is TRO. Note that the temperature signal of the blown air and the solar radiation amount signal may be input to the indoor target temperature calculation circuit 41.

The indoor temperature difference calculation circuit 42 uses this target temperature signal.
The difference ΔT between TRO and the current temperature inside the vehicle based on the signal SS2 from the vehicle room temperature sensor 32 is calculated.

The air volume calculation circuit 43 is the indoor temperature difference calculation circuit 42.
The amount of air blown out is calculated based on the signal ΔT from. This output signal is R.

When the change command signal DS1 is input by turning on the demist switch 37, the air volume change circuit 44 changes the output signal R based on the calculation result of the air volume calculation circuit 43 as necessary to generate the signal R'. Output.

That is, when the output signal R is higher than the voltage V _L that forms the predetermined low rotational speed, the signal R passes through the air volume changing circuit 44 without being changed. However, as shown in FIG. 3, when the demist switch 37 is turned on, if the output signal R is a voltage V _L that forms a predetermined low rotation speed, the rotation speed is higher than that. The output signal R' is changed to a voltage V _M that forms a predetermined rotational speed (in this embodiment, a rotational speed exactly in the middle of the capacity of the blower motor 14).
Furthermore, after a certain period of time T ₁ has passed,
The voltage of the output signal R' is gradually lowered over time T ₂ and is returned to the output signal R of the air volume calculation circuit 43.

As can be seen from the above, the air volume changing circuit 44 has timers with time constants T ₁ and T ₂ .

In the above explanation, it has been explained that the change command signal DS1 from the demist switch 37 is accepted when V=V _L , but this command signal DS1 is accepted whenever V=V _M or less. It may be acceptable.

The demist switch 37 has a change command signal DS1
In addition, the switching actuator 24 is driven by a signal DS2 based on the operation, so that air is blown from the defroster air outlet C and the foot air outlet A.

Next, the operation of this embodiment will be explained with reference to the flowchart shown in FIG. In addition, in the following explanation
Numbers such as (1), (2), etc. correspond to the numbers in the flowchart.

When the air conditioner is turned on, the system starts (1) and reads the outside air temperature, cabin temperature, and set temperature from each sensor 31, 32 and temperature setting switch 35 (2). Note that a solar radiation amount sensor may be provided to read the solar radiation amount, and an outlet temperature sensor may be provided to read the outlet temperature.

Based on these read signals SS1, SS2, and CS, the air volume calculation circuit 43 calculates the currently required air volume via the indoor target temperature calculation circuit 41 and the indoor temperature difference calculation circuit 42 (3).

After this, it is determined whether the demist switch 37 is turned on (on or not) (4).

When this demist switch 37 is not turned on, the system is controlled in the normal control mode (6). In addition, in the case of this example, the judgment in (4) is as follows:
The voltage V of the output signal R from the air volume calculation circuit 43 is
This is performed only when V _L , and when V>V _L , normal control mode control is performed without making this determination.

On the other hand, when the voltage V of the output signal R is V=V _L , the demist switch 37 is turned on (turned on).
In this case, the timer of the air volume changing circuit 44 is activated, and the motor control circuit 22 is further instructed to increase the rotation speed of the blower motor 14 to a predetermined high rotation speed.
A signal R' in which the voltage V is V _M is output, and the rotation speed of the blower motor 14 is increased. At the same time, in this embodiment, the switching actuator 24 forms a mode in which the defroster outlet C and the foot outlet A are opened, and this increase in air volume quickly removes fog.

In the case of this embodiment, the voltage V of the output signal R is automatically controlled, and is set to V _L when the set temperature and the actual vehicle interior temperature are approximately equal. Even when the rotation setting switch is operated to select a low rotation speed, the same operation as described above may be performed.

The demisting mode will remain in the demisting mode when the rotation speed reaches the specified high speed until the timer operation ends.
T Lasts for ₁ hour.

When this timer operation ends after a certain period of time _T1 has passed (10), the next timer having a time constant _T2 is started (11), and at the same time the voltage V of the signal R' to the motor control circuit 22 is , begins to gradually decrease from V _M to V _L (12).

The demist mode state where this voltage V is gradually decreased from V _M to V _L and the rotation speed gradually becomes lower is until the timer operation ends after time T ₂ has elapsed. last.

Then, when the timer operation ends (13), the signal
The voltage V of R' becomes V _L , and the normal control mode is returned (14).

This invention is not limited to the above embodiments, but includes the following:
This includes various modifications.

In the example, after the rotation speed of the blower motor was increased by turning on the demist switch, when returning to the original low rotation speed, the rotation speed was set to decrease linearly, but it was changed in multiple steps. It may be made to change in a curved manner or in a curved manner.

In addition, although a two-layer air conditioner was shown in the example, for example,
436 pages (June 1981, published by Nissan Motor Co., Ltd.)
The present invention may be applied to a single-layer air conditioner such as that described in .

In this single-layer air conditioner, unlike the two-layer air conditioner shown in the example, the air mix door is provided only on the air intake port side of the heater core, and the cold air passage is provided only on one side of the heater core. , the air mix door is controlled to an appropriate opening degree from a fully closed position that closes the air intake port of the heater core to a fully open position that closes the cold air passage, so that the warm air that has passed through the heater core and the cold air that has not passed are mixed downstream of the heater core. One air mix chamber is provided in the air mix chamber, and a foot outlet, a ventilator outlet, and a defroster outlet are provided downstream of the air mix chamber, and each outlet has its own outlet. It is equipped with a floor door, ventilator door, and defroster door that open and close the air.

Therefore, even if a plurality of air outlets are opened, the temperature of the air blown out from each air outlet is the same.

Then, the air mix door opening adjustment actuator of the embodiment may be set to drive the air mix door, and the air outlet switching actuator may be set to drive the floor door, ventilator door, and defroster door.

(Effects of the Invention) The automatically controlled air conditioner of the present invention has the following effects by having the above configuration.

In other words, even when the rotation speed of the blower motor is controlled to a low rotation speed (low speed rotation), when the demist switch is turned on, the rotation speed of the blower motor is kept at a predetermined high rotation speed for a certain period of time, and the blowing is stopped. Since the air volume is increased, a quick demisting effect (defogging effect on window glass) can be obtained.

Furthermore, the increased rotation speed of the blower motor automatically returns to the low rotation speed based on the original control operation after a certain period of time has passed, eliminating the need for re-operation to switch back to the original mode, thereby reducing the hassle of operation. can be avoided. By the way, when the rotation speed of the blower motor is low, for example, when the cabin temperature is close to the set temperature and is in a stable state, or when you want to reduce the blower motor noise, the demist effect It is necessary to return to such a stable state or noise reduction state after increasing the rotation speed to obtain a high rotation speed, and in the present invention,
This saves time and effort for this operation.

In addition, since such a return from a high rotational speed to a low rotational speed is performed gradually, the occupant can avoid discomfort caused by the sudden change in the rotational speed of the blower motor.

[Brief explanation of drawings]

Fig. 1 is a system diagram of an embodiment of the present invention, Fig. 2 is a system diagram showing the main parts of the embodiment of Fig. 1, and Fig. 3 is a system diagram for explaining the main points of the operation of the embodiment of Fig. 1. The characteristic diagram, FIG. 4, is a flowchart for explaining the operation of the embodiment shown in FIG. DESCRIPTION OF SYMBOLS 10... System chamber, 14... Blower motor, 22... Motor control circuit, 24... Air outlet switching actuator, 31... Outside temperature sensor (detection means), 32... Vehicle room temperature sensor (detection means), 3
5... Temperature setting switch (setting means), 37...
Demist switch, 40... Arithmetic control device.

Claims (1)

[Scope of Claims] 1. A detection means for detecting a physical environmental factor related to temperature and outputting it as an electrical signal; and a blower motor whose rotation speed is controlled by an output from a motor control circuit to adjust the amount of air blown out. , a switching actuator that is driven to open and close a door related to air outlet switching that blows out air, an air mix door opening adjustment actuator that is driven to adjust the opening of the air mix door to adjust the air blowing temperature, and an air conditioning system in the vehicle interior. It is a means to send an electric signal according to the setting operation by the occupant to set the environment, and it controls the temperature to the set temperature based on the drive of the air mix door opening adjustment actuator, and fogs the car window based on the drive of the switching actuator. a setting means having a demist switch for forming a demisting mode in which a predetermined air outlet is opened for removal; In order to set the temperature, there is provided an arithmetic and control device that sends a command signal to the motor control circuit, the switching actuator, and the air mix door opening adjustment actuator, and the arithmetic and control device controls the rotation of the blower motor when the demist switch is turned on. When the number of rotations is within a low rotation speed region below a predetermined rotation speed, the rotation speed of the blower motor is increased to a high rotation speed above the predetermined rotation speed for a certain period of time, and then gradually lowered to the original rotation speed. An automatically controlled air conditioner characterized by outputting a command signal.