JPS6213210B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an air conditioner for an automobile, and the mode is automatically switched based on the temperature of the air blown from the face outlet and the foot outlet and the outside air temperature. This is what I did.

Established in 1977 for air conditioners for automobiles.
As in No. 69250, mode switching is manually operated using a mode lever, and operation while driving poses a safety problem, and it is not always possible to switch to the optimal mode. Warm or cold air was often blown out from the vents at the feet, causing discomfort. There is also a device that automatically switches using air pressure, such as Utility Model Publication No. 48-29087, but the structure is larger.

For this reason, the present invention was created with the aim of eliminating the hassle of manual operation, and moreover, the mode is switched at the temperature most closely related to the feeling, so that the mode can be switched properly.

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

In FIG. 1, the illustrated automobile air conditioner is of the so-called air mix type, and an evaporator 1 is installed on the upstream side and a heater core 2 is installed on the downstream side.The evaporator 1 has the function of cooling incoming air. The evaporator 1,
It is composed of a compressor 3, a condenser 6, a liquid receiver 7, and an expansion valve 8 that are connected via piping, and is driven by turning the electromagnetic clutch 4 of the compressor 3 ON and OFF.
The drive control is performed by the output from the mode setting control circuit 5.

The heater core 2 has the function of warming the incoming air, and the inflow of engine cooling water is controlled by opening and closing the water tap 9. In this embodiment, the actuator 11 for controlling the air mix door 10 described below is used to control the inflow of engine cooling water. It is something that is controlled.

The air mix door 10 is provided upstream of the heater core 2, and the temperature is appropriately controlled by changing the mixing ratio of cold air and hot air depending on the opening degree of the air mix door 10. This air mix door 1
0 is an actuator whose opening degree can be changed by an actuator 11, but the actuator 11 is not shown in the figure, but uses various types such as one that uses negative pressure and one that uses electromagnetic force, and is not shown. The degree of opening is controlled by the output from the temperature control device.

The blower 12 selectively sucks outside air or inside air from an outside air port 13 or an inside air port 14 depending on the position of the inside/outside air switching door 15, and sends it to the evaporator 1 described above. The rotation speed of the blower 12 is sequentially controlled from stop to maximum rotation by the output of an air flow rate control device (not shown). The inside/outside air switching door 15 is also controlled by the output of the mode setting control circuit 5 via the actuator 16.

The most downstream part of this device is the face outlet 1.
The face outlet passage 17 is connected to the foot outlet 7', and the foot outlet passage 18 is connected to the foot outlet 18'. A door 20 for mode switching is also provided in the foot outlet passage 18, and the door 19 is controlled by the output of the control circuit 5 via an actuator 22, and the door 20 is also controlled for mode setting via an actuator 23. It is controlled by the output of the circuit 5 and can be switched to close the passage 18, send air to the footwells, or send air to the defrost outlet 28.

The mode setting control circuit 5 controls the drive of the compressor 3, the displacement of the inside/outside air switching door 15, and the mode switching doors 19, 2 according to various input conditions described below.
an outside air temperature detector 24 that controls the displacement of 0 and detects outside air temperature as an input to the control circuit 5;
There are a detector 25 for detecting the temperature of air blown from the face, a detector 26 for detecting the temperature of the air blown from the feet, and a detector 27 for detecting the opening degree of the air mix door 10. The signals inputted from these detectors 24, 25, 26, and 27 to the control circuit 5 are analog signals preferably as resistance values or voltage values corresponding thereto.

A detector 25 for detecting the temperature of the air blown from the face is provided at the above-mentioned face air outlet 17' or, if necessary, within the face air outlet passage 17, and detects the temperature of the air blown from the face.

The detector 26 for detecting the temperature of the air blown from the foot is provided at the foot air outlet 18' or, if necessary, within the foot air outlet passage 18, and detects the temperature of the air blown from the foot.

A detector 27 that detects the opening degree of the air mix door 10 is connected to the actuator 1 that moves the door 10.
1, and its displacement is detected by a potentiometer or the like.

The mode switching is based on the above-mentioned facial air temperature.
Doors 19, 2 such as the inside/outside air switching door 15, doors 19, 20, etc. based on the temperature of the air blown out at the feet and the outside air temperature
The displacement of the compressor 3 and the drive of the compressor 3 are controlled.

A flowchart of mode switching is shown in FIG. 2, and will be explained according to this flowchart. First, in this embodiment, COOL, VENT, BI-
It explains four modes: LEVEL and HEAT. In the COOL mode, the door 19 is open, the door 20 is closed, the compressor 3 is in a state where it can be operated depending on the temperature in the vehicle interior, etc. 30% depending on the need to close the inside/outside air switching door 15
The opening may be such that outside air can be introduced.

In the VENT mode, the door 19 is opened, the door 20 is closed, the inside/outside air switching door 15 is in a position where outside air can be introduced, and the compressor 3 is in a stopped state. In the BI-LEVEL mode, the doors 19 and 20 are both open (not fully open but narrowed to some extent), and the air mix door 10 is at an intermediate opening depending on the temperature inside the vehicle. In many cases, cold air is blown out from the face outlet 17', and warm air, which has been superheated because some of the air passes through the heater core 2, is blown out from the foot outlet 18'. The inside/outside air switching door 15 is in a position where outside air can be introduced, and the compressor 3 is in a stopped state.

In the HEAT mode, the door 19 is closed, the door 20 is open, and the inside/outside air switching door 15 is in a position where outside air can be introduced. In order to heat the introduced air, the air mix door 10 is opened to the full heater side, and hot air is blown out from the foot outlet 18'.

In the flowchart of FIG. 2, an example of mode switching of the present invention is shown. When the engine key switch is turned on, the microcomputer starts calculating from the start step, and the mode is set in the next mode initial setting. For example, when the COOL mode is set, the next step is to determine whether or not 2 minutes have elapsed in the cooler mode, that is, it is fixed for 2 minutes, and after 2 minutes, it is determined whether the outside air is higher than, for example, 15 degrees. If the outside temperature is higher than 15 degrees, it will continue to be set to cooler mode.

If the outside temperature is lower than 15 degrees, it is determined whether the face air temperature is higher than 20 degrees, and if the face air temperature is higher than 20 degrees, the cooler mode is continuously set. but if it is lower than
Setting is made to VENT mode.

When set to VENT mode, it will be fixed at VENT mode until 2 minutes have elapsed, and after 2 minutes, if the air mix door is on the full cool side, VENT mode will be set if the face outlet air temperature is lower than 22 degrees.
It remains in the COOL mode, but if the temperature of the air blown to the face reaches 22 degrees or higher, it switches to the COOL mode. Also, if the air mix door is not on the full cool side, if the face air temperature is lower than 22 degrees,
Although it remains in VENT mode, it switches to BI-LEVEL mode when the temperature of the air blown to the face reaches 22 degrees or higher.

When set to BI-LEVEL mode, it will be fixed to BI-LEVEL mode until 2 minutes have elapsed, and after 2 minutes, if the outside air is 15 degrees or higher, the temperature of the air blowing out at your feet will be 30 degrees or lower. for,
Switched to VENT mode. If the air temperature at your feet reaches 30 degrees or higher, the air temperature at your face will change.
If it is below 30 degrees, it will remain at BI-LEVEL, but
When the temperature of the face-blown air reaches 30 degrees or higher, it switches to HEAT mode. Also, if the outside air temperature is 15 degrees or less, if the face air temperature is 30 degrees or less, BI−
Although it remains in LEVEL mode, it switches to HEAT mode when the temperature of the air blown to the face reaches 30 degrees or higher.

When set to HEAT mode, it will be fixed to HEAT mode until 2 minutes have elapsed, and after 2 minutes, if the foot air temperature is 35 degrees or higher, it will remain in HEAT mode, but the foot air When the temperature drops below 35 degrees, it switches to BI-LEVEL mode.

In this way, mode switching is done after initial mode setting.
This is automatically performed sequentially among COOL, VENT, BI-LEVEL, and HEAT.

A specific example of the control circuit 5 is shown in FIG. The comparator 29 compares the output signal of the foot outlet air temperature detector 26 with a reference voltage to determine whether the foot outlet air temperature _tFT is 35°C or higher. The output signal is compared with a reference signal to determine whether t _FT is below 30°C. The comparator 31 compares the output signal of the outside air temperature detector 24 with a reference voltage and determines whether the outside air temperature _tA is 15°C or higher,
Comparator 32 is face blowing air temperature detector 25
The output signal is compared with a reference voltage to determine whether the facial air blowing air temperature t _FA is 30° C. or higher. The comparator 33 compares the output signal of the face air temperature detector 25 with a reference voltage to determine whether _tFA is 20°C or less, and the comparator 34 uses the output signal of the face air temperature detector 25 as a reference. The comparator 35 compares the voltage with the air mix door opening detector 27 to determine whether _tFA is 22°C or higher.
The output signal of is compared with a reference voltage to determine whether the opening degree θ _M of the air mix door is on the full cool side. In addition, mode initial setting inputs C, V,
BI and HE are signals that become H only during initial settings, and when the COOL mode is initialized and input C becomes H, the output of NOR circuit NOR ₁ becomes L and the output of inverter IN ₁ becomes H. . When the VENT mode is initialized and the input V becomes H, the output of the NOR circuit NOR ₂ becomes L and the inverter
When the output of IN ₂ becomes H and the initial setting of BI-LEVEL mode is made, the output of NOR circuit NOR ₃ becomes L.
Then, the output of inverter IN ₃ becomes H,
The initial setting of HEAT mode is done and the input HE is high.
When this happens, the output of the NOR circuit NOR ₄ becomes H, and the output of the inverter IN ₄ becomes H. Memory M stores the setting mode, and the oscillator OSC
When a clock pulse is input from the NOR circuit _NOR5 , the data from the inverters _IN1 to _IN4 is captured and stored, and its inverted outputs are output ₁ to ₄ .
issue. Among these inverted outputs ₁ to ₄ , those corresponding to the setting mode become 1 (H) and the others become 0 (L), and are output as mode setting output signals to drive the compressor 3 and the inside/outside air switching door 15. , and the displacement of the mode switching doors 19 and 20 are controlled to set the mode. Assuming that the COOL mode is currently set, only the inverted output ₄ of the memory M is set to 0. At this time, if t _A ≧ 15 and the output of the comparator 31 is H, the output of the NOR circuit NOR ₆ becomes L, the output of the NOR circuit NOR ₇ becomes H, the output of the NOR circuit NOR ₁ becomes L, and the inverter
The output of IN ₁ becomes H, and the inverted output ₄ of memory M remains 0, continuing the COOL mode. Also t _A
<15, and the output of the comparator 31 becomes L. If t _FA ≦20 and the output of the comparator 33 becomes H, the output of the NOR circuit NOR ₆ becomes L, and similarly, the inverted output ₄ of the memory M becomes 0. COOL mode continues. However, if the output of the comparator 31 becomes L when t _A < 15, and the output of the comparator 33 becomes L when t _FA > 20, the output of the NOR circuit NOR ₆ becomes H and the output of the inverter IN ₅ becomes L, resulting in a NOR The output of circuit NOR ₈ becomes H and the output of NOR circuit NOR ₂
The output of inverter IN 2 becomes L and the output of inverter IN ₂ becomes H. At the same time, the output of NOR circuit NOR ₇ becomes L, the output of NOR circuit NOR ₁ becomes H, and inverter IN ₁
The output becomes L. Therefore, the inverted output of memory M
₄ becomes H, the inverted output ₃ becomes L, and the COOL mode is switched to the VENT mode.

Each of the inverted outputs ₁ to ₄ of the memory M is differentiated by the differentiating circuits DF ₁ to _{DF 4} and input to the NAND circuit NA ₁ , and the monostable circuit MM is triggered by the output of the NAND circuit NA ₁ to keep the output high for 2 minutes. become.
Therefore, when the setting mode is switched or initialized, the memory M will not receive the clock pulses from the oscillator OSC until 2 minutes have elapsed, and will not receive the outputs of the inverters IN1 to IN4, and the inverted outputs ₁ to _IN4 will not be input to the memory _{M. 4} remains the same and the setting mode is fixed.

When set to VENT mode, if t _FA < 22 and the output of the comparator 34 is L, it is a NAND circuit.
The outputs of NA ₂ and NA ₃ become H, the output of NAND circuit NA ₄ becomes L, the output of NOR circuit NOR ₉ becomes H, the output of NOR circuit NOR ₂ becomes L, and the inverter
The output of IN ₂ becomes H and the inverted output of memory M becomes L.
VENT mode continues. t _FA ≧
When the output of the comparator 34 becomes H at 22, if the air mix door is on the full cool side and the output of the comparator 35 is H, the output of the NAND circuit NA ₃ becomes L and the output of the NOR circuit NOR ₁₀ becomes H. The output of NOR circuit NOR ₁ becomes L and the inverter
The output of IN ₁ becomes H. At the same time, the output of NAND circuit NA ₄ becomes H, the output of NOR circuit NOR ₉ becomes L, the output of NOR circuit NOR ₂ becomes H, and the inverter
The output of IN ₂ becomes L. Therefore, the inverted output ₃ of memory M becomes H, and the inverted output _Q4 becomes L.
You can switch from VENT mode to COOL mode.
Even if the output of the comparator 34 becomes H when t _FA ≧22, if the air mix door is not on the full cool side and the output of the comparator 35 is L, the NAND circuit NA ₃
When the output of NAND circuit NA becomes H, the output of NAND circuit NA ₂ becomes L and the NOR circuit becomes H. The output of NOR ₁₁ becomes H and the NOR circuit
The output of NOR ₃ becomes L and the output of inverter IN ₃ becomes H. At the same time, the output of NAND circuit NA ₄ becomes H, the output of NOR circuit NOR ₉ becomes L, and NOR circuit
The output of NOR ₂ becomes H and the output of inverter IN ₂ becomes L. Therefore, the inverted output ₃ of memory M is H.
Then, the inverted output ₂ becomes L, and the VENT mode is switched to the BI-LEVEL mode.

When set to BI-LEVEL mode, the output of the comparator 31 is L at t _A < 15 and t _FA < 30
If the output of comparator 32 is L, the outputs of NAND circuits NA ₅ and NA ₆ are H, the output of NAND circuit NA ₇ becomes L, the output of NOR circuit NOR ₁₂ becomes H, and the output of NOR circuit NOR ₃ becomes H. The output of the inverter _IN3 becomes H, and the inverted output ₃ of the memory M remains L, continuing the BI-LEVEL mode. t _A
When ≧15, the output of the comparator 31 becomes H and t _FT ≦
30, when the output of the comparator 30 becomes H, the output of the NAND circuit NA ₅ becomes L, the output of the NOR circuit NOR ₁₃ becomes H, the output of the NOR circuit NOR ₂ becomes L, and the output of the inverter IN ₂ becomes H. become. At the same time, the output of the NAND circuit _NA7 becomes H, the output of the NOR circuit _NOR12 becomes L, the output of the NOR circuit _NOR3 becomes H, and the output of the inverter _IN3 becomes L. Therefore, the inverted output ₃ of the memory M becomes H and the inverted output ₂ becomes L.
The mode can be switched from BI-LEVEL mode to VENT mode. Also, when t _A < 15, the output of the comparator 31 becomes L, and when t _FA ≧ 30, the output of the comparator 32 becomes H, the output of the NAND circuit NA ₅ becomes H, and the output of the NAND circuit NA ₆ becomes L, resulting in a circuit
The output of NOR ₁₄ becomes H, the output of NOR circuit NOR ₄ becomes L, and the output of inverter IN ₄ becomes H. At the same time, the output of NAND circuit NA ₇ becomes H and the NAND circuit becomes H.
The output of NOR ₁₂ becomes L, the output of NOR circuit NOR ₃ becomes H, and the output of inverter IN ₃ becomes L. Therefore, the inverted output ₂ of memory M becomes H, the inverted output ₁ becomes L, and the HEAT changes from BI-LEVEL mode.
mode can be switched.

When set to HEAT mode, if t _FT ≧ 35 and the output of comparator 35 is H, the inverter
The output of IN ₆ becomes L, the output of NOR circuit NOR ₁₅ becomes H, the output of NOR circuit NOR ₄ becomes L, the output of inverter IN ₄ becomes H, and the inverted output of memory M
₁ remains at L and the HEAT mode continues. When the output of the comparator 35 becomes L when t _FT <35, the output of the NOR circuit NOR ₁₆ becomes H, the output of the NOR circuit NOR ₃ becomes L, and the output of the inverter IN ₃ becomes H. At the same time, the output of inverter IN ₆ is high.
Then, the output of the NOR circuit NOR ₁₅ becomes L, the output of the NOR circuit NOR ₄ becomes H, and the output of the inverter IN ₄ becomes L. Therefore, the inverted output ₁ of the memory M becomes H, the inverted output ₂ becomes L, and the HEAT mode is switched to the BI-LEVEL mode.

The control circuit 5 may be configured by a microcomputer 5a as shown in FIG. 4, and the microcomputer stores the above-mentioned flowchart, performs predetermined arithmetic processing based on the input information, and controls the flow of specific equipment. It is possible to control the operation according to the following.

As described above, according to the present invention, since the mode switching is automatically performed, the troublesome manual operation can be eliminated and safety can be improved. Since the temperature of the air blown out from the air outlet is detected, the mode can be appropriately switched at the temperature most closely related to the feeling.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of an automotive air conditioner to which the present invention is applied, FIG. 2 is a flowchart showing mode switching operation in the device, and FIG. 3 is a block diagram showing a control circuit in the device. Fourth
The figure is a block diagram showing an embodiment of the present invention. 3... Compressor, 5... Control circuit, 15...
...Inside and outside air switching door, 19, 20...Mode switching door, 24...Outside air temperature detector, 25...Face air temperature detector, 26...Face air temperature detector, 27...Air mix door open degree detector.

Claims (1)

[Scope of Claims] 1 It has at least an evaporator and a heater core, and the temperature is adjusted by controlling the air that has passed through the evaporator and enters the heater core with an air mix door, and the air whose temperature has been adjusted is A mode switching door for opening and closing the face outlet and the foot outlet, and a mode switching door for opening and closing the face outlet and the foot outlet; an actuator that drives the door, a face outlet air temperature detector that detects the temperature of the air blown out from the face outlet, and a foot outlet air temperature detector that detects the temperature of the air blown out from the foot outlet. and a control circuit that selects outputs from the face outlet air temperature detector and the foot outlet air temperature detector according to a mode, and controls the actuator in accordance with the selected temperature. A mode switching device for an automotive air conditioner, characterized by: 2 It has at least an evaporator and a heater core, and the temperature is adjusted by controlling the air that has passed through the evaporator and enters the heater core with an air mix door, and the temperature-adjusted air is sent to the face outlet and the foot outlet. In an automotive air conditioner configured to blow air into a vehicle interior from at least one of the outlets, after initial setting of a mode, air is emitted from the face air outlet and the foot air outlet which are opened according to the set mode. detecting the temperature of the air, determining a mode according to the temperature of the air, and detecting the temperature of the air blown out from the face outlet and the foot outlet, which are opened according to the determined mode. A mode switching method for an automobile air conditioner, characterized in that the mode is repeatedly controlled according to the temperature of the air.