JPH0121002B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for controlling the air outlet temperature of an automatically controlled air conditioner that eliminates the occurrence of temperature control errors caused by a response delay of a duct sensor installed in the air outlet duct of the air conditioner. Regarding correction structure.

Conventional technology Conventionally, as an automatically controlled air conditioner installed in a vehicle, the structure shown in Figure 4 has been put into practical use.
(Refer to "Service Bulletin" No. 489, pages V-75-80). That is, the air conditioner main body 1 is constructed by connecting a blower unit 2, a cooling unit 3, and a heater unit 4. The blower unit 2 includes:
outside air intake port 5, inside air intake port 6, both intake ports 5,
An intake door 7 for opening and closing the cooling unit 6 and a blower fan 8 are provided, and an evaporator 9 is provided within the cooling unit 3. In addition, air mix doors 11, 12, and 13 are provided in the heater unit 4 to control the amount of air passing through the heater core 10 according to the heater core 10 and its opening degree. , 15, 16, a defroster duct 17, a ventilator duct 18, and a foot duct 1.
9 is provided. Each duct 17, 18, 19
A defroster door 20, a ventilator door 21, and a foot door 22 are pivotally supported at the base end of the
Duct sensors 23, 24, 25 are arranged inside each duct 17, 18, 19. The duct sensors 23, 24, 25 are connected to an input section of a control unit 26, along with other temperature sensors (not shown) such as a solar radiation sensor, and the output section of the control unit 26 includes the intake door 7, air mix door 11, etc. , 12, 13, an actuator that separately drives the defroster door 20, ventilator door 21, and foot door 22 (not shown)
It is connected to the. In such a structure, the control unit 26 controls each duct sensor 23, 2.
Based on the output signals 4, 25, etc., calculations are performed to create an optimal environment within the vehicle interior, and based on the calculation results, a command signal is sent to the actuator.
Then, the actuator sets the opening degrees of the air mix doors 11, 12, and 13 to control the temperature of the blowing air, and drives the defroster door 20, ventilator door 21, and foot door 22 to open and close as appropriate, for example, the defroster duct 17 and the foot duct 19. HEAT mode opens the ventilator duct 18 and closes the ventilator duct 18, and B/L opens the ventilator duct 17 and foot duct 19 and closes the defroster duct 17.
(bi-level) mode is selected.

Problems to be Solved by the Invention However, in such conventional devices,
When the HEAT mode is selected, since no air circulates in the ventilator duct 18, the duct sensor 24 in the ventilator duct 18 detects a temperature much lower than the temperature of the blown air that remains in the ventilator duct 18. It is in a state of adaptation to a certain cabin temperature. Therefore, when switching from HEAT mode to B/L mode, the duct sensor 2
4 does not instantaneously respond to the temperature of the outlet air in the ventilator duct 18, and continues to output the lower temperature inside the vehicle in an adapted state to the control unit 26 until it is warmed by the outlet temperature. .
As a result, the control unit 26 calculates the lower temperature inside the vehicle as the outlet temperature in the ventilator duct 18, and controls the air mix doors 11, 12 in order to set the outlet temperature to a higher temperature necessary to create an optimal environment. , 13 is output. Therefore, ventilator outlet 1
5, hot air is blown out temporarily until the duct sensor 24 in the ventilator duct 18 adapts to the blowing temperature and detects the actual blowing temperature, and the hot air causes discomfort to the occupant's head. . Of course, the above phenomenon can be solved by using a temperature sensor with a smaller time constant as the duct sensor 24, but with such a means, the temperature sensor responds sensitively to the outlet temperature that changes instantaneously due to external conditions etc. after mode switching. Hunting occurs, making it impossible to control the outlet temperature.

The present invention has been made in view of such conventional circumstances, and provides a blowout temperature correction structure for an automatically controlled air conditioner that eliminates the blowout temperature control error caused by the response delay of the duct sensor without causing hunting. It is something.

Means for Solving the Problems In order to solve the above problems, the present invention includes a detection means for detecting physical environmental factors related to temperature and outputting them as electrical signals, and a detection means for detecting physical environmental factors related to temperature and outputting them as electrical signals. a setting means for transmitting an electrical signal in accordance with a setting operation by a passenger to set a physical environmental factor;
A drive device that drives operating elements related to the conditioned air temperature and blowout mode of the air conditioner main body, and output signals from the detection means and the setting means are used to perform calculations to create an optimal environment in the vehicle interior, and based on the calculation results. an automatic control air conditioner comprising: an arithmetic and control device that sends a command signal to the drive device based on the
The operating element includes a door that opens and closes the defroster, ventilator, and foot air distribution duct of the air conditioner main body, and an air mix door that controls the amount of air passing through the heater core according to the degree of opening, and the detection means includes at least The arithmetic and control unit includes a main duct sensor with a required time constant and a pre-duct sensor with a smaller number of time points than the main duct sensor, and the arithmetic and control device includes, for example,
Select and input the detection signal of the pre-duct sensor based on a switching command signal from a blowout mode that closes the ventilator duct like the HEAT mode to another blowout mode that opens the ventilator duct like the B/L mode. However, a used sensor selection circuit is provided which switches and inputs the detection signal of the main duct sensor after a predetermined period of time has elapsed.

Operation In the above configuration, when the arithmetic and control device selects, for example, the HEAT mode based on the calculation result, the ventilator duct is closed by the door, and conditioned air is fed into the vehicle interior through another duct.
Therefore, both the pre- and main duct sensors arranged in the ventilator duct do not detect the air outlet temperature, and are almost in a state of adapting to the vehicle interior temperature.
When the arithmetic and control unit selects, for example, the B/L mode due to changes in physical environmental factors related to the temperature inside the vehicle, the ventilator duct is opened and conditioned air is supplied to the vehicle interior through the ventilator duct. sent. Then, the used sensor selection circuit inputs the detection signal of the pre-duct sensor based on the switching command signal from the HEAT mode to the B/L mode. Since the pre-duct sensor has a smaller time constant than the main duct sensor, it instantaneously responds to the temperature of the blowing air that has started flowing into the ventilator duct. Therefore, the arithmetic and control device calculates the opening degree of the air mic door based on the actual air outlet temperature detected by the pre-duct sensor, and controls the air outlet temperature to an appropriate value to create an optimal environment in the vehicle interior. When a predetermined period of time has elapsed after the switching command signal was output, the used sensor selection circuit selectively inputs the detection signal of the main duct sensor. At this point, the main duct sensor is already adapted to the blowout temperature, so that the actual blowout temperature can be properly detected, and the arithmetic and control device can use this actual blowout temperature to execute the calculation. Furthermore, from then on, arithmetic control is executed without hunting based on the detection signal of the main duct sensor, which has a larger time constant than the pre-duct sensor.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. That is, as shown in FIG. 2, the air conditioner main body 1 is constructed by connecting a blower unit 2, a cooling unit 3, and a heater unit 4. The blower unit 2 is provided with an outside air intake 5, an inside air intake 6, an intake door 7 for opening and closing both intakes 5 and 6, and a blower fan 8. Inside the cooling unit 3, an evaporator 9 is installed. It is arranged. Furthermore, the heater unit 4 is provided with air mix doors 11, 12, and 13, which are operation elements that control the amount of air passing through the heater core 10 according to the heater core 10 and its opening degree. A defroster duct 17, a ventilator duct 18, and a foot duct 19 are formed which communicate with an air outlet (not shown) provided inside the room. Each duct 17,1
A defroster door 20, a ventilator door 21, and a foot door 22 are pivotally supported at the base ends of the defroster doors 8 and 19, and a sub-defroster door 27 is provided below the defroster door 20. Further, a defroster duct sensor 23 and a foot duct sensor 25 are disposed inside the defroster duct 17 and the foot duct 19, respectively.
A main duct sensor 28 having a simultaneous constant with both the duct sensors 23 and 25 and a pre-duct sensor 29 having a smaller time constant than the main duct sensor 28 are disposed within the main duct sensor 8 . Each duct sensor 23, 25, 2 constituting this detection means
8 and 29 are connected to the input section of the arithmetic and control unit 34 via an A/D converter 33 along with other detection means such as an outside air sensor 30, a solar radiation sensor 31, and a room temperature sensor 32, as shown in FIG. Further, a room temperature setting switch 35 serving as setting means is connected to the input section of the arithmetic and control unit 34.

This arithmetic and control device 34 includes a
7, 18, and 19, an outside air sensor 30, a solar radiation sensor 31, and a temperature setting switch 35.
A blowout mode calculation circuit 36 that performs calculations based on the output signal of the sensor, and the switch 3
0, 31, 35 and the output signal of the room temperature sensor 32. On the output side of the target outlet temperature calculation circuit 37, there is a sensor selection circuit 3 to be used.
8 through the defroster duct sensor 23, foot duct sensor 25, pre-main duct sensor 2
The air mix door 1 is configured to set the target outlet air temperature based on the actual outlet air temperature inputted from the air mixer door 1
An air mix door opening degree calculation circuit 39 is provided to calculate the rotation angles of rotation angles 1, 12, and 13. The use sensor selection circuit 38 selectively inputs the detection signals of the respective duct sensors 23, 25, 28, 29 corresponding to the blowout mode determined by the blowout mode calculation circuit 36, and also selects the use of the ventilator duct 18. The detection signal of the pre-duct sensor 29 is selectively inputted based on the switching command signal from the blow-off mode for closing the ventilator duct 18 to another blow-out mode for opening the ventilator duct 18, and the detection signal is approximately equivalent to the time constant of the main duct sensor 28. The main duct sensor 28 has a selection function that switches and inputs the detection signal of the main duct sensor 28 after a predetermined period of time has elapsed.

Note that 40 is a first drive circuit that outputs drive signals to the ventilator door actuator 41, defroster door actuator 42, and foot door actuator 43, which are drive devices, based on the output signal of the blowout mode calculation circuit 36; This is a second drive circuit that outputs a drive signal to the air mix door actuator 47 in accordance with the difference in opening between the air mix door opening before operation detected by the comparison circuit 45 and the calculated value.

Next, the operation of this embodiment configured as above will be explained according to the flowchart shown in FIG. That is, when the operating switch (not shown) of the air conditioner main body 1 is input, the flag is reset in a step, and the set temperature Ts input by the occupant to the room temperature setting switch 35 and the sensors 30, 31, 32 are set in sequence. The outside air temperature T _a , the amount of solar radiation Z, and the room temperature T _r thus detected are input (step). Then, based on these data, the blowout mode calculation circuit 36 and the target blowout temperature calculation circuit 37
The above-mentioned calculation is executed (step), and each mode of VENT, HEAT, and B/L consisting of the following modes is selected from the calculation result of the blowout mode calculation circuit 36.

VENT mode: Only the ventilator duct 18 is opened, and both the defroster and foot ducts 17 and 1 are opened.
Close 9.

HEAT mode: Defroster, foot both ducts 1
7 and 19 are opened and the ventilator duct 18 is closed.

B/L mode: Ventilator, foot both ducts 1
8 and 19 are opened and the defroster duct 17 is closed.

When one of the modes is selected by the blowout mode calculation circuit 36, the first drive circuit 40 selects the door 20, 21, 22, 27 corresponding to each mode.
To rotate the actuator 4 for the ventilator door, defroster door, and foot door.
A drive signal is output to ducts 1, 42, and 43, and each duct 17, 18, and 19 is opened depending on the mode. Assuming that the blowout mode selected here is HEAT mode, the determination in step
The defroster is in the open state in this HEAT mode.
Duct sensor 2 in both foot ducts 17 and 19
The differential outlet temperature T _dd and foot outlet temperature T _dL of No. 3 and 25 are input (step). Therefore, the air mix door opening calculation circuit 39
The opening degrees θ of the air mix doors 11, 12, 13 are calculated based on the outlet temperatures T _dd , T _dL detected by the air mixers 3 and 25 and the calculation result of the target air outlet calculation circuit 37 (step). ，
13 is set to the opening degree θ according to the stroke amount of the air mix door actuator 47 operated by the output signal of the second drive circuit 44, and at the same time the flag is reset (step).

Next, during air conditioning in HEAT mode, the blowout mode calculation circuit 33 changes as external conditions change.
When the B/L mode is selected, the B/L is determined in step, the input of the foot outlet temperature T _dL detected by the foot duct sensor 25 is allowed (step), and the flag is set and reset. It is determined (step). If the mode before switching is the HEAT mode, the flag will have been reset in step, so this determination will be NO and the process will proceed to step. In this step, a timer T provided in the use sensor selection circuit 38 and set to a set time b (b≒20 seconds), which is the predetermined time, is activated, and at the same time, the vent outlet temperature, which is the detection signal of the pre-duct sensor 29, is activated. T _dup is selected and input (step). Then, the air mix door opening calculation circuit 39
uses the actual vent outlet temperature T _dup to calculate the appropriate air mix door opening degree θ to create an optimal environment inside the vehicle (step), and the loop of ~ is repeated until the set time b of the timer T elapses. It will be returned. At this time, since the pre-duct sensor 29 has a smaller time constant than the main duct sensor 28, it instantaneously responds to the temperature of the outlet air that has started being fed into the ventilator duct 18, and detects the actual vent outlet temperature T _dup without response delay. is input to the air mix door opening calculation circuit 39. Therefore, the air mix door opening calculation circuit 39 increases the air mix door opening using the temperature of the cabin air that had accumulated in the ventilator duct 18 as data before the mode switching, and supplies hot air to the ventilator duct 18. The air mixer door 11, 12, 13 outputs an appropriate calculated value that creates an optimal environment inside the vehicle without outputting a calculated value that would cause the air to open at the opening angle θ.
It is controlled by

When the set time b has elapsed, the used sensor selection circuit 38 switches and inputs the detection signal of the main duct sensor 28 (step), and the air mix door opening calculation circuit 39 selects the vent outlet temperature T input from the main duct sensor 28. The air mix door opening degree θ is calculated using _duM as data, and a flag is set (step). At this time, the main duct sensor 28 detects the set time b.
During this period, the temperature is being heated by the air blown from the ventilator, so even if the time constant is large, the temperature of the blown air can already be detected properly. Therefore, the air mix door opening calculation circuit 39 can output an appropriate calculated value using the vent outlet temperature T _duM , and since the main duct sensor 28 has a large time constant, the ventilator outlet can be adjusted depending on external conditions etc. Even if the temperature changes instantaneously, the air mix door 1 will respond sensitively and will not cause hunting.
1, 12, and 13 controls can be executed.

Note that when the HEAT mode is switched to the VENT mode, the process advances from step to step, and from then on, the same determination and processing as in the case of switching to the B/L mode described above are performed, and the B/L mode is changed.
When switching from L mode to VENT mode or from VENT mode to B/L mode, the main duct sensor 28 is sufficiently adapted to the outlet temperature in the mode before switching (the flag is set in step). Therefore, the main duct sensor 2 is activated immediately after the switching.
8 is used to calculate the air mix door opening degree θ.

Effects of the Invention As explained above, the present invention disposes a main duct sensor and a pre-duct sensor with a smaller time constant than the main duct sensor in a ventilator duct, and opens the ventilator duct from a mode in which the ventilator duct is closed. When the mode is switched to another mode, the detection signal of the pre-duct sensor is selectively inputted, and after a predetermined period of time, the detection signal of the main duct sensor is switched and inputted. Therefore, the outlet temperature immediately after mode switching is detected without delay by the pre-duct sensor with a small time constant, and the air mix door is not controlled based on the cabin temperature that had accumulated in the ventilator duct before switching. The opening is controlled to create an optimal environment within the vehicle cabin based on the actual air outlet temperature. Therefore, when switching to the mode, it is possible to eliminate the phenomenon in which hot air is temporarily blown out from the ventilator duct, which is caused by using the vehicle interior temperature as the outlet temperature, and after a predetermined period of time has passed, the main duct, which has a large time constant, can be removed. By using a sensor, it is possible to perform automatic control without causing hunting.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention, and FIG. 2 is a conceptual diagram of an air conditioner main body according to the embodiment.
FIG. 3 is a flowchart showing the operation of the same embodiment, and FIG. 4 is a schematic explanatory diagram of a conventional automatically controlled air conditioner. 1...Air conditioner main body, 10...Heater core, 1
1, 12, 13... Air mix door, 17...
Defroster duct, 18... Ventilator duct, 19... Foot duct, 20... Defroster door, 21... Ventilator door, 22... Foot door, 28... Main duct sensor, 29...
Pre-duct sensor, 34... Arithmetic control device, 38
...Sensor selection circuit to be used.

Claims (1)

[Claims] 1. Detection means that detects physical environmental factors related to temperature and outputs them as electrical signals; and setting means that sends out electrical signals according to setting operations by the occupant to set physical environmental factors related to temperature in the vehicle interior. and,
A drive device that drives operating elements related to the conditioned air temperature and blowout mode of the air conditioner main body, and the output signals of the detection means and the setting means perform calculations to create an optimal environment in the vehicle interior, and calculate the results of the calculations. In the automatic control air conditioner, the operation element includes a defroster of the air conditioner main body;
The ventilator and the foot have doors that open and close each of the air distribution ducts, and an air mix door that controls the amount of air passing through the heater core according to the degree of opening. and a pre-duct sensor with a small time constant, and the arithmetic and control unit is configured to switch the pre-duct from a blow-out mode that closes the ventilator duct to another blow-out mode that opens the ventilator duct based on a command signal. A blowout temperature correction structure for an automatically controlled air conditioner, comprising a sensor selection circuit for selectively inputting a detection signal of a duct sensor, and switching and inputting a detection signal of a main duct sensor after a predetermined period of time has elapsed.