JPH01233113A - Air conditioner for automobile - Google Patents

Abstract

PURPOSE:To adjust each detecting means through visual inspection without using special equipment by operating the operating devices for the detected temperature, aimed temperature, blower and the mode after switch an instruction means and permitting the change to the temperature value of the temperature information such as the outside and inside air temperature from the indication of the aimed temperature. CONSTITUTION:When a temperature setting switch 41 is operated, a display driving circuit 52 is controlled by a microcomputer 43, and the display element 42A of a temperature display panel 42 digital-displays the set temperature. When a mode switch 40 is operated to select the ON auto mode, an air conditioner operates. Then, the microcomputer 43 controls an air mixing door 15 on the basis of each detection signal supplied from the inside and outside air temperature sensors 5 and 6. In other words, an ON/OFF-valve 50 is driven, and an air mixing door 15 is turned to the position 15A by a power servo 7, and at the same time, a blower motor 22 is revolved at the max. air quantity by a driving circuit 49, and cooling is carried out.

Description

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

[Conventional technology]

A conventional air conditioner has a configuration as shown in FIG. That is, in the vicinity of the outside air intake and the inside air intake, there is an intake door 17 that controls the amount of outside air and the amount of inside air.
is provided with an adjustable opening. This intake door 17
has the function of determining the ratio of mixing only inside air or only outside air, or mixing outside air and inside air. This intake door 17 is configured to be operated 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 mink store 15 is provided at the center on the downstream side of the evaporator 23, and a water heater 24 is provided on the downstream side of the air mix door 15. This air mix I-5 rotates in the direction shown by arrow A during maximum cooling and operates to block the passage passing through the water heater 24, and rotates in the direction shown by arrow B during maximum heating. It acts so that the air sent by the blower motor 22 passes through the water heater 24. This water heater 24 is for heating the air sent by the blower motor 22.

On the downstream side of this water heater 24, pens 1 to 18 and a floor door 19 are provided for switching between an outlet that blows out to the two body side and an outlet that blows out to the feet. , floor space 19 are configured to be operated by actuators 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 6, and fan rheostats 1 to 20 are provided to move in conjunction with the air mix door 15.

This feedback potentiometer 8 has 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 the temperature controller 1 to the roller 9, and the other end of the back potentiometer 8 is also connected to the temperature controller I to the roller 9.
It is connected to the. This temperature controller l-roller 9 has an I-
A transducer 3-0 is connected, and this transducer 10 is for introducing negative pressure introduced from the vacuum tank 11 into the power servo 7.

Also, in combination with the vacuum selector 2 connected to the program switch 16, the actuators 12, 13
．． 14 to open and close the intake door 17, which switches the air intake, and the upper body blowout I.
~718, is for controlling the floor door 19 that opens and closes the foot air outlet in a pattern as shown in FIG. In addition, the vacuum selector 2 is linked to the motor 1 to lever 1, and the motor 1 lever is used to select the on/off and operating state of the air conditioner, including normal off mode, auto 1 on mode, and defroster mode. It has at least three of the following.

Since it is configured in this way, when you set the desired temperature using the temperature lever 3 and drive the air conditioner using the mode lever 1, the temperature setting resistor 4 linked to the temperature lever 3 and the inside air temperature sensor 5, an outside temperature sensor 6, a feedback potentiometer 8, and a temperature controller 9 equipped with an adjustment trimmer 25.
1 controls the Herance adjuster 10, drives the power servo 7, and sets the resistance value of the feedback potentiometer 8. In order to set this feedback potentiometer 8 to a predetermined value, the power servo 7 is driven, but the drive of this power servo 7 directly rotates the air mix door 15, so this air mink store]
The rotation of -5 drives the fan rheostat 20, which moves in conjunction with the rotation of the air mix door 15.
- the roller 21 controls the blower motor 22;

The relationship between the resistance values of the fan rheostats 1 to 20 and the opening degree of the air mix door 15 is as shown in FIG. That is, the point where the air mix door 15 is at a horizontal value indicates the lowest position of the fan rheostat resistance value, and as the air mix door circuit moves toward the maximum cooling position, the fan rheostat resistance value increases, thereby causing the blower motor 22 The air volume increases.

Note that the adjustment trimmer 25 is a variable resistor used to adjust the temperature controller 9. and,
Adjustment of this temperature controller 9 is performed by using an inside air temperature sensor 5,
In place of the outside air temperature sensor 6, temperature setting resistor 4 and feedback potentiometer 8, a standard resistor 30 is used as shown in FIG.
, and use the tester 31 to make sure that the current output to the 1 Herance Diverter 10 becomes a predetermined value.
This is achieved by variably adjusting the lumber 25.

In addition, the ventilation path that can be changed by the mode lever 1 is controlled by a mechanism in the vacuum selector 2 that is linked to the mode lever 1.
, 13 and 14 by selecting and switching the negative pressure that passes through. 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. In accordance with this, the pro-air motor 22 is controlled by the fan controller 21, and a pattern as shown in FIG. 2 is selected by the program switch 16 which operates in conjunction with the air mix door 15.

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 open the vent door 18. . Further, as the air mix door moves to the heating position, the intake door 17 moves in the direction 17B, and the actuator 13 is driven to move the vent door 18 in the direction of closing, and the actuator 14 is moved to the position to close the floor door 18. It opens and is controlled so that the intake air is air from inside and outside, and the exhalation air is blown out from the upper body and feet. Furthermore, when the maximum heating position is reached, the intake air operates 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 detect abnormalities in various sensors used in automatic air conditioning by visual inspection using an operating device such as a mode switch and a display element for displaying internal temperature, etc., without using special equipment. Our objective is to provide an automatic air conditioner that can

[Means to solve the problem]

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, and a means for setting the detected temperature, the target temperature, and a blower. The automatic system has a calculation device that performs certain calculations based on information from the operation device, and according to the calculation results, air inside the vehicle or outside air is taken into the blower at a predetermined air volume and passed through the evaporator or water heater for heating and cooling. In the air conditioner, one display element for digitally displaying the temperature information such as the target temperature and the inside air temperature is provided on the temperature display panel, and the temperature value of the temperature information to be displayed is displayed on the display element. , a switchable instruction means is provided, and when the instruction means is switched and the operating device is operated, the display target of the temperature information can be sequentially changed.

[Effect]

According to the above configuration, when the operating device is operated after switching the instruction means, the display content of the display element that was displaying the target temperature etc. changes to the temperature value to be displayed as temperature information, and when the operating device is further operated, the display element displays the target temperature etc. The content changes to the temperature value of another display target. This makes it possible to visually adjust each detection means without using any special equipment.

〔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, the 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. A three-way valve 51 is connected to the vacuum tank 1, and a power servo 7 is connected to the three-way valve 51 via an on/off valve 50. 1 to back potentiometer 8 and air mix door 15 are installed.This on/off valve 50
The three-way valve 51 is operated by the microcomputer 43.
controlled by a signal from d. Further, a blower motor drive circuit 49 is connected to the blower motor 22.
This blower motor drive circuit 49 is connected to 104.3d of the microcomputer 43. This microcomputer 43 includes l1043d and CPU4.
3a, ROM4.3b, RAM43c,
timer/]3e. A multiplexer 44 is connected to l1043d of this microcomputer 43 via an AD converter 45. This multiplexer 44 is connected to l1043d of the microcomputer 43. This multiplexer 4
4 is configured such that 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 are input.

On the other hand, a temperature display panel 42 is provided at an appropriate location in the vehicle interior, and this temperature display panel 42 includes a display element 42A that digitally displays the desired vehicle interior temperature setting value, and a display element 42A that digitally displays the current vehicle interior temperature. 4, 2 B, a temperature setting switch 4 which is used to set the desired vehicle interior temperature and corresponds to the temperature lever 3 in the conventional example shown in FIG. A mode switch 40 is provided as an operating device having three modes: an off mode, an on/off mode, and a defroster mode. A display perturbation circuit 52 is connected to the display elements 42A and 42B of the temperature display panel 42, and this display drive circuit 52 is connected to the microcomputer 43.
connected to d. Further, the temperature setting switch 41 and the mode 1 switch 40 are each connected to the terminal 1043d of the microcomputer 43. This mode switch 40 is configured so that off mode 1 (on auto mode, defroster mode, etc.) can be selected with a single push button.

Further, the 1-lima 25 is connected to the A-D converter 45. Also, the microcomputer 43's engineering 104.3
A switch 46 and a resistor 47 as indicating means are connected to d. The other end of this resistor 47 is grounded. Further, a power source 48 is connected to the other end of this switch 46.

Since it is configured in this way, by pressing the up switch (a switch that increases the set temperature) or the down switch (a switch that lowers the set temperature), which are the push buttons of the temperature setting switch 41, the electric signal is transmitted. is input to the microcomputer 43's step 1043a, the microcomputer 43 selects the temperature setting value corresponding to the desired vehicle interior temperature, and immediately
The microcomputer 43 switches to the temperature set value via the display drive circuit 42. Next, the motor switch 40
When the on auto mode is selected from 1 to 1, this on signal causes l1043 of the microcomputer 43 to
A signal from the mode switch 40 is taken into the CPU 43a via d.

In this CPU 4.3a, a program corresponding to the mode selected from 1 to 1 by the mode switch 40 is read from the ROM 43b. The air conditioner operates according to this program. When the air conditioner is activated, first the temperature setting resistance value is changed from the temperature setting switch 41 to l.
The output value from the outside air temperature sensor 6 and the output value from the inside air temperature sensor 5 are each input to the CPU 4, 3a through the l1043d.
The deviation X is taken into U43a and calculated according to the following equation.

However, Tr: Vehicle interior air temperature TS: Set temperature Ta: Outside air temperature If the value of this deviation
When the value of this deviation X is (+), the air mix door 15 is driven in the cooling direction.

That is, when the deviation X is positive, the on/off valve 50 is driven and the air mix door 15
is rotated to the 15A position, and at the same time, the blower motor drive circuit 49 rotates the blower motor 22 at the maximum air volume. At this time, the intake door 17, vent 1-a 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 with the maximum air volume, the voltage applied to the blower motor supplied from the blower motor drive circuit 49 is lowered in accordance with the decrease in the deviation X.
2. Lower the rotation speed to reduce the air volume. That is, as shown in FIG. 5(A), when the deviation X exceeds the predetermined value A and becomes further smaller, the voltage applied to the pro-ar motor is linearly reduced in response to the reduction. When this deviation X reaches the second predetermined value B, the voltage applied to the proar motor becomes constant, and the air volume value of the proar motor 22 becomes the minimum value. This pro motor 22
When the air volume reaches the minimum air volume value, the opening degree of the air mix door 15 is controlled by the control amount Y, which is added with a time integral term for correcting the residual deviation with respect to the deviation X at that time, as shown in FIG. 5(B). This control amount Y is determined by the following equation.

Y=X+-fxdt...
(2) That is, the air mix door 15 is fixed at the position shown in 15A until the deviation X reaches the predetermined value B shown in FIG. When B is exceeded, the power servo 7 is driven based on the control amount Y at that time to slowly move the air mix door 15 and control the vehicle interior temperature to the 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 on (off), the l1043d terminal of the microcomputer 43 is connected to the cathode of the power supply 48 via the resistor 47, and is rLOWJ, which detects that it is not the time of adjustment. Further, when this switch 46 is short-circuited (turned on), the positive terminal of the power supply 48 becomes l1.
Since it is connected to 043d, it becomes rHIJ and it is determined 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, if it is the outside air temperature sensor 6, the display element 42A will display rTAJ as shown in FIG. 6, indicating that it is the outside air temperature sensor 6. 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. This adjustment of the sensor is performed by the adjustment operator by operating the trimmer 25 so that the temperature displayed by the accurate thermometer matches the detected value from the sensor to be displayed.

This series of operations is performed according to the control flowchart shown in FIG. That is, in step 6°, the initial setting of the RAM 43C of the microcomputer 43 and the l10
43d is initialized, in step 61, a signal from the microcomputer 43 is sent to the electrical signal from the temperature setting switch 41, the inside air temperature sensor 5 which is the input of the multiplexer 44, the outside air temperature sensor 6, An electrical signal from the feedback potentiometer 8 is input to the cPU 43a of the microcomputer 43. When data is input in this step 61, it is determined in the swing 62 whether or not the sensor is currently being adjusted, that is, whether or not the switch 46 is on. If it is determined in step 62 that the 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. When the data to be displayed is determined in step 63, in step 64 the display object is displayed on the display element 42A and the detected temperature from the sensor is displayed on the display element 42B as shown in FIG. In the example shown in FIG. 6, rTAJ, that is, the outside air temperature sensor 6 is
This indicates that the temperature is detected to be 0°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 1 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 diagnose abnormalities in the connection line to which that sensor is connected. 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. When the mode is processed in step 65, it is determined in step 66 whether or not the system is stopped. When it is determined in step 66 that the system has stopped, processing for stopping the system, such as stopping the pro-ar motor 22, is performed in step 67. When the stop processing is performed in step 67, the process returns to step 61. Further, if it is determined in step 66 that the system is not stopped, in step 68 the deviation Y is determined by the above formulas (1) and (2), and the microcomputer 4
The voltage applied to the blower motor 22 is determined according to the characteristics shown in FIG. In step 68, the voltage applied to the air mixer door 1 is determined.
5. Determine the opening degree. Note that Tr in the above equation (1) is the vehicle interior air temperature detected by the inside air temperature sensor 5, Ts is the set temperature set by the temperature setting switch 41, and T
a is the outside air 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. . Air mix door in step 69]
When the opening degree of -5 is determined, in step 70, the suction port and the discharge port shown in FIG. 2 are determined according to the opening degree of the air mix door]5 calculated in step 69. When the suction port and the discharge port shown in FIG. 2 are determined, in step 71 the actuator 12, actuator 13, actuator 14
Negative pressure supplied to the device is intermittent and controlled to a predetermined mode.

Next, in step 72, the CI of the microcomputer 43 is set to the pro-ar motor drive circuit 49 so that the applied voltage of the pro-a mode 22 calculated in step 68 is obtained.
-'A control signal is given from U43a via ■1043d. The control signal in step 72 controls the blower motor 22 according to the characteristics shown in FIG.

Air conditioning control is performed by controlling the air volume of the blower motor 22, and when the air volume of the blower motor 22 reaches the minimum value, in step 73, the current value is calculated from the data of the feedback potentiometer 8 input in step 6 and the temperature data in step 69. It compares the 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;
When it is determined in step 73 that the temperature has shifted to the heating side, the on-off valve 5o 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 shift is toward the cooling side, the on/off valve 5
0 and switch the three-way valve 51 to the negative pressure introduction side.

When the air mix door control is performed in this step 73, the display drive circuit 52 sets the set temperature on the display element 42A to be displayed on the display element 42B in step 74.
The vehicle interior air temperature is displayed respectively, and the process returns to step 61.

The mode switch 40 and the temperature setting switch 41 are the eighth
As shown in the figure, it is monitored at regular time intervals.

That is, pulses generated from the system clock of the microcomputer 43 are counted by a timer 43e, and a key operation is performed using a timer interrupt of about 100 Hz generated by the overflow. The control flow is shown in FIG. That is, in step 80, a key is input manually, and in step 81, a mode flag is set in the RAM 43c of the microcomputer 43 according to the input key information, and 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 executed. Wait until the main flow resumes.

Therefore, according to this embodiment, information of any sensor can be read out from inside the microcomputer 43 and displayed. For example, the true temperature measured by the reference thermometer in the outside air temperature sensor 6 and the microcomputer 4
By making adjustments using the trimmer 25 attached to the A-D converter 45 so that the temperatures input by the sensors 3 and 3 match, matching between the sensor and the control circuit can be easily performed using only the reference thermometer.

Furthermore, 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 adjusted visually without using special equipment.

Furthermore, in order to display the detected temperature of each detection means without relying on the present invention, the temperature display panel must be provided with display elements corresponding to the number of each detection means, but the present invention does not include the indicating means. Since the display target is selected by the operating device after switching, only one display element is required.

[Brief explanation of the drawing]

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 block diagram showing an embodiment of the automatic air conditioner according to the present invention, FIG. 5 (A) is a control characteristic diagram of the blower motor of the embodiment shown in FIG. ) is a control characteristic diagram of the air mix door of the illustrated embodiment in FIG. 4, FIG. 6 is a diagram showing the regulator panel of the illustrated embodiment in FIG. 4, and FIG. 7 is a control flowchart of the illustrated embodiment in FIG. 4. FIG. 8 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 potentiometer, 15...Air mix door, 22...Blower motor, 40...Mode switch,
41...Temperature setting switch, 42...Display panel,
42A, 42B...Display element, 43...Microcomputer, 46 River switch, 4
9 ・Blower motor drive circuit.

Claims (1)

[Claims] 1. A detection means for detecting temperature information at multiple locations such as outside air temperature and inside air temperature, means for setting a target temperature of inside air, and certain calculations are performed based on these detected temperatures, the target temperature, and information from the blower operating device. In an automatic air conditioner that has a calculation device, and according to the calculation results, air inside the vehicle or outside is taken into the blower at a predetermined air volume and passed through the evaporator or water heater for cooling and heating. A display element for digitally displaying the temperature information is provided on the temperature display panel, and an indicating means is provided that can be switched to display a temperature value to be displayed on the temperature information on the display element, An automatic air conditioner characterized in that the automatic air conditioner is configured such that when the operating device is operated by switching means, the display target of the temperature information can be sequentially changed.