JPH0380645B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an air conditioner for automobiles.

[Conventional technology]

A conventional air conditioner has a configuration as shown in FIG. That is, an intake door 17 that controls the amount of outside air and the amount of inside air is provided in the vicinity of the outside air intake and the inside air inlet so as to be able to open freely. This intake door 17 has the function of determining the ratio of mixing only the inside air, only the outside air, or the outside air and the inside air. This intake door 17
is configured to be actuated by an actuator 12. A blower motor 22 serving as an air blower is provided downstream of the intake door 17, and an evaporator 23 is provided downstream of the blower motor 22. This evaporator 23 has the function of cooling the air sent by the blower motor 22. An air mix door 15 is provided at the center on the downstream side of the evaporator 23, and a water heater 24 is provided downstream of the air mix door 15. At maximum cooling, the air mix door 15 rotates in the direction shown by arrow A and operates to block the passage passing through the water heater 24. At maximum heating, it rotates in the direction shown by arrow B and operates to block the passage passing through the water heater 24. All of the air thus sent passes through the water heater 24. This water heater 24 is for heating the air sent by the blower motor 22. A vent door 18 and a floor door 19 are provided on the downstream side of the water heater 24 to switch between an air outlet that blows out to the upper body side and an air outlet that blows out to the feet. 19 are configured to be actuated by the actuator 14, respectively.

On the other hand, a power servo 7 is connected to the air mix door 15 and is configured to be driven by this power servo 7. A feedback potentiometer 8, a program switch 16, and a fan rheostat 20 are provided to move in conjunction with the air mix door 15.
This feedback potentiometer 8 includes an outside air temperature sensor 6, an inside air temperature sensor 5, and a temperature setting resistor 4.
are connected in series, and this temperature setting resistor 4 is a potentiometer that operates in conjunction with the temperature lever 3. This temperature setting resistor 4 is connected to a temperature controller 9, and the other end of the feedback potentiometer 8 is also connected to the temperature controller 9. A transducer 10 is connected to this temperature controller 9, and this transducer 10 is for introducing negative pressure introduced from a vacuum tank 11 into the power servo 7.
In addition, in combination with the vacuum selector 2 connected to the program switch 16, the actuators 12, 13, and 14 are operated to operate the intake door 17 that switches the air intake, the vent door 18 that opens and closes the upper body air outlet, and the foot air outlet. This is to control the opening and closing of the floor door 19 in a pattern as shown in FIG. In addition, the vacuum selector 2 is linked to the motor lever 1, which selects the on/off and operating state of the air conditioner, and has at least three modes: normal off mode, auto on mode, and defroster mode. ing.

Since it is configured in this way, when the desired temperature is set using the temperature lever 3 and the air conditioner is driven using the mode lever 1, the temperature setting resistor 4 linked to the temperature lever 3 ,
An inside air temperature sensor 5, an outside air temperature sensor 6, a feedback potentiometer 8, and an adjustment trimmer 25
from the temperature controller 9 equipped with
controls the transducer 10 to drive the power servo 7 and set the resistance value of the feedback potentiometer 8. This feedback potential 8
The power servo 7 is driven in order for the power servo 7 to be set to a predetermined value, but the drive of the power servo 7 directly causes the air mix door 15 to rotate. The fan controller 21 controls the blower motor 22 according to the resistance value of the fan rheostat 20, which moves in conjunction with the rotation of the air mixer door 15. The relationship between the resistance value of the fan rheostat 20 and the opening degree of the air mix door 15 is as shown in FIG. In other words, the point where the air mix door 15 is at a horizontal value indicates the lowest position of the fan rheostat resistance, and as the air mix door circuit moves toward the maximum cooling position, the fan rheostat resistance increases. Therefore, the amount of air generated by the blower motor 22 increases. Note that the adjustment trimmer 25 is a variable resistor used to adjust the temperature controller 9. The adjustment of this temperature controller 9 is as follows:
In place of the inside air temperature sensor 5, outside air temperature sensor 6, temperature setting resistor 4, and feedback potential 8, a standard resistor 30 is installed as shown in FIG. 3, and the current output to the transducer 10 becomes a predetermined value. Using the tester 31, test the trimmer 2 as follows.
This is achieved by variably adjusting 5.

In addition, the ventilation route switched by the mode lever 1 is changed by selecting the negative pressure conducted to each actuator 12, 13, 14 by a mechanism cut in the vacuum selector 2 which is linked to the mode lever 1. This is done by switching. When the mode lever 1 and temperature lever 3 are set in this way, the inside air temperature and outside air temperature are detected, the power servo 7 is operated with negative pressure, and the opening degree of the air mix door 15 is adjusted. The blower motor 22 is controlled by the fan controller 21 according to the opening degree, and the program switch 16 operates in conjunction with the air mix door 15.
A pattern as shown in FIG. 2 is selected by. That is, when the air mix door is at the maximum cooling position, the intake door 17 operates to the 17A position to introduce inside air, and the air outlet operates the actuator 14 to close the floor door 19 and actuate the actuator 13 to close the vent door 18. Open. Further, as the air mix door moves to the heating position, the intake door 17 moves in the direction 17B, driving the actuator 13 to move the vent door 18 in the closing direction, and driving the actuator 14 to close the floor door 18. It is controlled so that the air is opened and the air inside and outside is blown out as intake air, and the air is blown out from the upper body and feet as exhaled air. Further, when the maximum heating position is reached, the intake air activates the actuator 12 to control the intake door 17 to the position shown in 17B to introduce outside air, and the vent door 18 is closed to open the floor door 19.
is opened and the air is blown from the feet.

[Problem to be solved by the invention]

In the conventional automatic air conditioner configured in this way, there are errors in the temperature control of the cabin air due to variations in the adjustment of temperature sensors such as the inside air temperature sensor, and the sensitivity of each temperature sensor. If this occurs, or if the error in the temperature control of the cabin air increases due to aging of the temperature sensors in each part, special equipment is required to detect abnormalities beyond those of the temperature sensors in each part. It had the disadvantage that corrections and corrections could only be carried out at specialized factories.

An object of the present invention is to visually detect abnormalities in various sensors used in automatic air conditioning using an operating device such as a mode switch and a display element for displaying internal temperature, etc., without using special equipment. The purpose of the present invention is to provide an automatic air conditioner that can perform the following tasks.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a detection means for detecting temperature information at a plurality of locations such as outside air temperature and inside air temperature, means for setting a target temperature of inside air, It has a calculation device that performs certain calculations based on these detected temperatures, target temperatures, and information from operating devices such as mode switches, and according to the calculation results, the air inside the vehicle or the outside air is sent to the blower at a predetermined air volume. In an automatic air conditioner that performs air conditioning or heating by passing the intake air to an evaporator or water heater, a display element for displaying temperature information such as a target temperature and an indoor air temperature is provided on the temperature display panel, and a display element for displaying the temperature information such as a target temperature and an indoor air temperature is provided on the temperature display panel. A test mode changeover switch is provided for switching to a test mode in which the temperature information is displayed, and display switching means is provided for switching and displaying the temperature information to be displayed in a predetermined order by operating it in the test mode.

[Effect]

According to the above configuration, temperature information such as the target temperature and the inside air temperature is normally displayed on the display element, but when the test mode changeover switch is turned on, the mode is switched to the test mode and diagnosis of the detection means is started. By operating the display switching means in the inspection mode, the temperatures to be displayed are switched and displayed on the display element in a predetermined order.

〔Example〕

Examples of the present invention will be described below.

FIG. 4 shows an embodiment of an air conditioner according to the present invention.

In the figure, parts with the same reference numerals as those in the conventional example shown in FIG. 1 are the same parts and have the same symbols.
4 are I/Os of the microcomputer 43, respectively.
43d. Further, a three-way valve 51 is connected to the vacuum tank 11, and a power servo 7 is connected to the three-way valve 51 via an on-off valve 50. A feedback potentiometer 8 and an air mix door 15 are attached to the power servo 7. This on/off valve 5
0 and the three-way valve 51 are controlled by a signal from the I/O 43d of the microcomputer 43. Further, a blower motor drive circuit 49 is connected to the blower motor 22, and this blower motor drive circuit 49 is connected to the I/O 43 of the microcomputer 43.
connected to d. This microcomputer 43 has an I/O 43d, a CPU 43a, and a ROM 4.
3b, RAM 43c, and timer 43e. A multiplexer 44 is connected to the I/O 43d of the microcomputer 43 via an AD converter 45. This multiplexer 44 includes a microcomputer 43.
I/O 43d is connected. The multiplexer 44 is configured to receive the output value of the feedback potentiometer 8, the output value from the inside air temperature sensor 5, and the output value from the outside air temperature sensor 6.

On the other hand, temperature display panels 42 are installed at appropriate locations in the vehicle interior.
The temperature display panel 42 is provided with a display element 42A for digitally displaying the desired vehicle interior temperature setting value, a display element 42B for digitally displaying the current vehicle interior temperature, and a display element 42B for digitally displaying the desired vehicle interior temperature setting. It is used to select the temperature setting switch 41, which corresponds to the temperature lever 3 in the conventional example shown in FIG. Three mode switches 40 are provided. A display drive circuit 52 is connected to the display elements 42A and 42B of this temperature display panel 42.
2 is the I/O 43d of the microcomputer 43.
It is connected to the. In addition, the temperature setting switch 41
and mode switch 40 are each connected to I/O 43d of microcomputer 43. This mode switch 40 is configured so that off mode, on auto mode, defroster mode, etc. can be selected with a single push button.

Further, the trimmer 25 is connected to the A-D converter 45. Further, an inspection mode switching switch 46 and a resistor 47 are connected to the I/O 43d of the microcomputer 43. This resistance 47
The other end is grounded. Also, this switch 4
A power source 48 is connected to the other end of 6.

Since it is configured in this way, by pressing the up switch (switch that increases the set temperature) or down switch (switch that lowers the set temperature), which is the push button of the temperature setting switch 41, the electricity can be turned off. The signal is input to the I/O 43a of the microcomputer 43, a temperature setting value corresponding to the desired vehicle interior temperature is selected in the microcomputer 43, and the microcomputer 43 is immediately inputted via the display drive circuit 52. Switch to temperature set value. Next, when the ON/AUTO mode is selected by the mode switch 40, this ON signal is sent to the CPU 4 via the I/O 43d of the microcomputer 43.
A signal from the mode switch 40 is taken in by the mode switch 3a. In this CPU 43a, a program corresponding to the mode selected by the mode switch 40 is read from the ROM 43b. The air conditioner operates according to this program. When the air conditioner operates, first, the temperature setting resistance value is transmitted from the temperature setting switch 41 via the I/O 43d.
At the same time, the output value from the outside air temperature sensor 6 and the output value from the inside air temperature sensor 5 are input to the CPU 43a via the I/O 43d.
3a and the deviation X is calculated according to the following equation.

X = Tr - Ts + Ta - 25/8 ... (1) However, Tr: Indoor air temperature Ts: Set temperature Ta: Outside air temperature If the value of this deviation When the value of X is (+), the air mix door 15 is driven in the cooling direction. That is, when the deviation Rotate with . At this time, the intake door 17, vent door 18, and floor door 19 are controlled as shown in FIG. 2, respectively. When the deviation X becomes smaller than a predetermined value due to the operation of the blower motor 22 at the maximum air volume, the blower motor applied voltage supplied from the blower motor drive circuit 49 is lowered in accordance with the decrease in the deviation X, and the rotation speed of the blower motor 22 is lowered. I will reduce the airflow. That is, as shown in FIG. 5A, when the deviation X exceeds a predetermined value A and becomes further smaller, the voltage applied to the blower motor is linearly reduced in response to the reduction. When this deviation X reaches the second predetermined value B, the voltage applied to the blower motor becomes constant, and the blower motor 22 reaches the minimum air volume value. When this blower motor 22 reaches the minimum air volume value, the deviation
The opening degree of the air mix door 15 is controlled as shown in FIG. 5B by the control amount Y including a time integral term for correcting the residual deviation. This control amount Y is determined by the following equation.

Y=X+1/680∫×dt...(2) That is, the air mixer door 15 is fixed at the position shown at 15A until the deviation X reaches the predetermined value B shown in FIG. is controlled, and when the deviation X exceeds a predetermined value B, the power servo 7 is controlled based on the control amount Y at that time.
is also driven to drive the air mixer door 15 and control the vehicle interior temperature to a set value. The characteristics shown in FIGS. 5A and 5B are stored in the ROM 43b of the microcomputer 43 in advance.

Next, the adjustment operations of various temperature sensors will be explained. When the switch 46 is not turned on (off), the terminal of the I/O 43d of the microcomputer 43 is connected to the cathode of the power supply 48 via the resistor 47, and is set to "LOW", indicating that it is not during adjustment. Detect. Furthermore, when this switch 46 is short-circuited (turned on), the positive terminal of the power supply 48 is connected to the I/O 43.
d and becomes “HI”, indicating that adjustment is in progress. Depending on whether the switch 46 is turned on or off, it is determined whether the various sensors are adjusted or not. When the switch 46 is short-circuited, the display of the sensor to be adjusted is changed from the display of the normal sensor. That is, for example, the outside air temperature sensor 6
If so, "TA" is displayed on the display element 42A as shown in FIG.
. Further, the display device 42B shows the value detected by the sensor shown in the display device 42A, for example, 30° C. as shown in FIG. Adjustment of this sensor is performed by an adjustment operator so that the temperature displayed by an accurate thermometer matches the detected value from the sensor that is being displayed.
This is done by operating the trimmer 25.

This series of operations is performed according to the control flowchart shown in FIG. That is, in step 60, the RAM 43c of the microcomputer 43
After initializing the I/O 43d and initializing the initial state of the I/O 43d, in step 61, the electrical signal from the temperature setting switch 41 and the multiplexer 44 are sent by the signal from the microcomputer 43.
The electrical signals from the inside air temperature sensor 5, the outside air temperature sensor 6, and the feedback potentiometer 8, which are input to the microcomputer 43, are sent to the CPU 4 of the microcomputer 43.
Enter in 3a. When data is input in step 61, it is determined in step 62 whether the sensor is currently being adjusted, that is, whether the switch 46 is on. If it is determined in step 62 that adjustment is in progress, it is determined in step 63 what to display based on a flag provided in the RAM 43c of the microcomputer 43. After determining the data to be displayed in step 63, in step 64 the display object is displayed on the display element 42A and the temperature detected from the sensor is displayed on the display element 42B as shown in FIG. In the example shown in FIG. 6, "TA" indicates that the outside air temperature sensor 6 has detected that the temperature is 30°C. This switching of the display target is performed by operating the switch 40 and changing the flag in step 81, which will be described later. That is, during adjustment, both display elements 42A, 42B and switch 40 perform functions unrelated to the temperature display and mode setting functions in the normal control mode. The configuration is such that the sensor to be adjusted is switched each time the switch 40 is operated once. After the sensor name and temperature are displayed in step 64, the process returns to step 61. This makes it possible to display the detected temperature value of each temperature detection sensor, that is, the detection status, and by comparing it with the actual temperature of that part, it is easy to visually identify abnormalities in the connection line to which that sensor is connected. can now be diagnosed.

Next, if it is determined in step 62 that adjustment is not in progress, mode processing is performed in step 65 according to information from the mode switch 40 input by a timer interrupt, which will be described later. This step 65
When the mode is processed in step 66
It is determined whether the system is stopped or not. If it is determined in step 66 that the system has stopped, processing for stopping the system, such as stopping the blower motor 22, is performed in step 67.
When the stop processing is performed in step 67, the process returns to step 61. If it is determined in step 66 that the system is not stopped, the deviation and the control amount Y is determined by the above formulas (1) and (2),
The voltage applied to the blower motor 22 is determined in accordance with the characteristics shown in FIG. 5, which are stored in advance in the ROM 43b of the microcomputer 43. When the voltage applied to the blower motor is determined in step 68, the voltage applied to the air mixer door 15 is determined in step 69.
Determine the opening degree. Note that Tr in the above formula (1) is the vehicle interior air temperature detected by the interior air temperature sensor 5,
Ts is the set temperature set by the temperature setting switch 41, and Ta is the outside temperature detected by the outside air temperature sensor 6. Furthermore, the deviation X is the difference between the cabin air temperature and the set temperature plus a correction for the outside air temperature, and the control amount Y is the sum of the time integral term for correcting the residual deviation with respect to the deviation X. . In step 69 air mix door 1
Once the opening degree of air mix door 15 is determined, in step 70, the inlet and outlet ports shown in FIG. 2 are determined in accordance with the opening degree of air mix door 15 calculated in step 69. Once the suction port and discharge port shown in FIG. 2 have been determined, in step 71 the actuator 12, actuator 13, The negative pressure supplied to the actuator 14 is intermittent and controlled to a predetermined mode. Next, in step 72, a control signal is applied from the CPU 43a of the microcomputer 43 to the blower motor drive circuit 49 via the I/O 43d so as to obtain the applied voltage of the blower mode 22 calculated in step 68. The control signal in step 72 controls the blower motor 22 in accordance with the characteristics shown in FIG. This blower motor 22
When the air conditioning is controlled by the air volume control of the blower motor 22 and the air volume of the blower motor 22 reaches the minimum value, in step 73, the current value obtained from the data of the feedback potentiometer 8 input in step 61 and the temperature data are calculated in step 69. It compares the calculated air mix opening degree and determines whether they match or whether there is a deviation toward the cooling side or the heating side. If it is determined in step 73 that they match, the on-off valve 50 is closed, and if it is determined in step 73 that there is a shift toward the heating side, the on-off valve 50 is opened in step 73 and the three-way valve 51 is opened to the atmosphere. On the other hand, if it is determined in step 73 that the air pressure has shifted to the cooling side, the on/off valve 50 is opened and the three-way valve 51 is switched to the negative pressure introduction side.

When the air mix door control is performed in step 73, the display drive circuit 5 is controlled in step 74.
2, the set temperature is displayed on the display element 42A, and the vehicle interior air temperature is displayed on the display element 42B, and the process returns to step 61.

Mode switch 40 and temperature setting switch 4
1 is monitored at regular time intervals as shown in FIG. That is, the pulses generated from the system clock of the microcomputer 43 are sent to the timer 43.
e, and the overflow causes approx.
Perform key input using a 100Hz timer interrupt.
The control flow is shown in FIG. That is, in step 80, a key is input, and in step 81, a mode flag is set in the RAM 43c of the microcomputer 43 in accordance with the input key information, processing for changing the set temperature is performed, and the process returns to the main flow shown in FIG. In the flow shown in Fig. 8, a timer interrupt is generated at regular time intervals, and when this timer interrupt occurs, the main flow shown in Fig. 7 is temporarily saved to the register, and the control flow shown in Fig. 8 is performed. Wait and continue with the main flow again.

Therefore, according to this embodiment, the information of any sensor can be read and displayed from inside the microcomputer 43, for example, the outside air temperature sensor 6.
The sensor and control circuit are adjusted by the trimmer 25 attached to the A-D converter 45 so that the true temperature measured by the reference thermometer matches the temperature input by the microcomputer 43. Matching can be easily performed using only a thermometer as a reference.

Further, according to this embodiment, since each sensor can be adjusted, malfunctions of sensors in each part can be easily discovered.

〔Effect of the invention〕

As described above, according to the present invention, various detection means (sensors) used in automatic air conditioning can be visually adjusted without using special equipment.

In addition, since the display switching means has a function of switching and displaying the display objects in a predetermined order, it is possible to judge the display contents without displaying the names of the display objects, and it is possible to quickly check the displayed temperature. can.

[Brief explanation of drawings]

Figure 1 is an overall configuration diagram of a conventional air conditioner, Figure 2 is a diagram showing the pattern of the ventilation door of the air conditioner, and Figure 3 is adjustment of the temperature controller of the conventional air conditioner shown in Figure 1. FIG. 4 is a configuration diagram showing an embodiment of the automatic air conditioner according to the present invention, FIG. 5A is a control characteristic diagram of the blower motor of the embodiment shown in FIG. FIG. 6 is a diagram showing the regulator panel of the illustrated embodiment in FIG. 4. FIG. 7 is a control flowchart of the illustrated embodiment in FIG. 4. The figure is a timer interrupt flowchart of the embodiment illustrated in FIG. 5... Inside air temperature sensor, 6... Outside air temperature sensor, 7... Power servo, 8... Feedback potential, 15... Air mix door, 22
...Blower motor, 40 ...Mode switch, 4
1...Temperature setting switch, 42...Display panel,
42A, 42B...display element, 43...microcomputer, 46...switch, 49...blower motor drive circuit.

Claims (1)

[Scope of Claims] 1. Detection means 5 and 6 for detecting temperature information at a plurality of locations such as outside air temperature and inside air temperature, means 41 for setting a target temperature of inside air, and a switch between these detected temperatures, the target temperature, and a mode switch. A calculation device 4 that performs certain calculations based on information from an operation device 40 such as
3, and according to this calculation result, the cabin air
In an automatic air conditioner that performs heating and cooling by taking in air 17A or outside air 17B into a blower at a predetermined volume and passing it through an evaporator 23 or a water heater 24, display elements 42A and 42B are used to display the temperature information such as the target temperature and the inside air temperature. In addition to being provided on the temperature display panel 42, the display elements 42A,
42B is provided with an inspection mode changeover switch 46 for switching to an inspection mode in which the temperature information is displayed, and further provided with display switching means for switching and displaying the temperature information to be displayed in a predetermined order by operating it in the inspection mode. An automatic air conditioner characterized by: 2. The automatic air conditioner according to claim 1, wherein the display switching means is any one of the operation devices 40. 3. The automatic air conditioner according to claim 1 or 2, characterized in that the display objects are sequentially switched in a predetermined order each time the display switching means is operated once. automatic air conditioner.