JP2912921B2 - Automotive air conditioners - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for an automobile. 2. Description of the Related Art 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 intake so as to be freely openable. The intake door 17 has an action of determining only the inside air or only the outside air, and the ratio of mixing the outside air and the inside air. The intake door 17 is configured to be operated by the actuator 12. A blower motor 22 as a blower is provided downstream of the intake door 17, and an evaporator 23 is provided downstream of the blower motor 22. The evaporator 23 has a function of cooling the air sent by the blower motor 22. An air mix door 15 is provided at the center of the downstream side of the evaporator 23.
5, a water heater 24 is provided. The air mix door 15 rotates in the direction indicated by the arrow A during maximum cooling and operates so as to close the passage passing through the water heater 24, and rotates in the direction indicated by the arrow B during maximum heating and is fed by the blower motor 22. All of the air produced acts to pass through the water heater 24. This water heater 2
4 is for heating the air sent by the blower motor 22. On the downstream side of the water heater 24, a vent door 18 and a floor door 19 for switching between an outlet for blowing to the upper body side and an outlet for blowing to the feet are provided.
And the floor door 19 is
, Respectively. On the other hand, a power servo 7 is connected to the air mix door 15 and is configured to be driven by the power servo 7. The feedback potentiometer 8 and the program switch 16 and the fan rheostat 20 are provided so as to move in conjunction with the air mix door 15. An outside air temperature sensor 6, an inside air temperature sensor 5, and a temperature setting resistor 4 are connected in series to the feedback potentiometer 8, and the temperature setting resistor 4 is a potentiometer that operates in conjunction with the temperature lever 3. The 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 the temperature controller 9.
The transducer 10 is for introducing a negative pressure introduced from the vacuum tank 11 to the power servo 7. The actuator 1 is combined with the vacuum selector 2 connected to the program switch 16.
The intake door 17 for operating the air intakes 2, 13, 14 to switch the air intake, the vent door 18 for opening and closing the upper body outlet, and the floor door 19 for opening and closing the foot outlet.
Is controlled in a pattern as shown in FIG. The vacuum selector 2 is linked to a mode lever 1. The mode lever 1 selects on / off and an operating state of the air conditioner. The mode lever 1 has at least three of a normal off mode, an auto on mode, and a defroster mode. I have. Since the desired temperature is now set by the temperature lever 3 and the air conditioner is driven by the mode lever 1, the temperature setting resistor 4 linked to the temperature lever 3 Inside air temperature sensor 5, outside air temperature sensor 6, temperature controller 9 including feedback potentiometer 8 and adjustment trimmer 25
Therefore, the temperature controller 9 controls the transducer 10 to drive the power servo 7 and set the resistance value of the feedback potentiometer 8 so that these combined resistance values become constant. In order to set the feedback potentiometer 8 to a predetermined value, the power servo 7 is driven. However, the drive of the power servo 7 causes the air mix door 15 to rotate as it is. The rotation of the door 15 is the air mix door 1
The fan rheostat 20 which moves in conjunction with the rotation of the fan 5 is driven, and the fan controller 21 controls the blower motor 22 according to the resistance value of the fan rheostat 20. The relationship between the resistance value of the fan rheostat 20 and the opening of the air mix door 15 has a relationship as shown in FIG. That is, the point at which the air mix door 15 is at the horizontal value indicates the lowest position of the fan rheostat resistance value, and the fan rheostat resistance value increases as the air mix door circuit moves toward the maximum cooling position, whereby the air volume by the blower motor 22 is reduced. growing. The adjusting trimmer 25 is a variable resistor used for adjusting the temperature controller 9. The temperature controller 9 is adjusted by installing a standard resistor 30 as shown in FIG. 3 in place of the inside air temperature sensor 5, the outside air temperature sensor 6, the temperature setting resistor 4, and the feedback potentiometer 8 so that the current output to the transducer 10 is reduced. Using the tester 31 so that it becomes a predetermined value,
This is achieved by variably adjusting the trimmer 25. In order to change the ventilation path which is switched by the mode lever 1, a negative pressure conducted to each of the actuators 12, 13 and 14 is selected by a structure provided in a vacuum selector 2 which is linked to the mode lever 1. This is done by switching. Thus mode lever 1
When the temperature lever 3 is set, the inside air temperature and the outside air temperature are detected, the power servo 7 is operated at a negative pressure to adjust the opening of the air mix door 15, and the blower motor 22 is operated in accordance with the opening of the air mix door 15. Fan controller 2
2 is selected by a program switch 16 controlled by the air mix door 15 and operated in conjunction with the air mix door 15. That is, when the air mix door is at the maximum cooling position, the intake door 1
7 operates at the position 17A to introduce inside air, and the outlet operates the actuator 14 to close the floor door 19 and the actuator 13 to open the vent door 18. In addition, as the air mix door moves to the heating position, the intake door 17 moves in the direction of 17B, drives the actuator 13 to move the vent door 18 in the closing direction, and drives the actuator 14 to open the floor door 18. It is controlled so that the inside and outside air is blown out from the upper body and the feet as exhaled air. Further, when it reaches the maximum heating position, the intake air operates the actuator 12 to control the intake door 17 to the position shown at 17B to introduce outside air, close the vent door 18, open the floor door 19, and blow out air from the feet. You. [0007] In the conventional automatic air conditioner configured as described above, there are variations in the adjustment of the temperature sensors such as the inside air temperature sensor and the quality of the sensitivity of the temperature sensors. If an error occurs in the temperature control of the vehicle interior air, or if the temperature control error of the vehicle interior air expands due to aging of the temperature sensors in each part, it is necessary to detect the above abnormalities in the temperature sensors in each part. Since special equipment is required, there is a drawback that correction and correction of each sensor can be performed only in a specialized factory. In addition, a plurality of values such as an outside air temperature and an inside air temperature are used.
Setting means for detecting the temperature information of the place and the target temperature.
Temperature setting means, the detected temperature, the target temperature and the
It takes in information from operating devices such as
Microcomputer that outputs a control signal for performing degree control
In air conditioners for automobiles that include
The operating time of operating devices such as the target temperature and switches
If the time is as short as 0.1 seconds, the operation can be detected.
May not work . An object of the present invention is to use an operation device such as a mode switch and a display element for displaying an internal temperature or the like, and to visually detect abnormality of various sensors used for automatic air conditioning by using a special device. It is an object of the present invention to provide an automatic air conditioner that can be performed without using an automatic air conditioner. [0010] In order to achieve the above object, the present invention provides a detecting means for detecting temperature information of a plurality of locations such as an outside air temperature and an inside air temperature, and a temperature setting for setting a target temperature. Means, and an air conditioner for an automobile, comprising: a microcomputer that takes in information from operating devices such as a detected temperature, a target temperature, and a switch and outputs a control signal for performing temperature control in a vehicle cabin. The microcomputer includes the switch and the temperature setting unit.
Is operated at a fixed time interval by the timer
And wherein the benzalkonium such has a function of monitoring in interrupt processing. According to the above construction, the set temperature is changed,
When the operating state of the switch or temperature setting means changes
Immediately, the change is detected and the state immediately after the change is
The corresponding control is performed . When a switch or temperature setting means is operated,
If the operation time is short, for example, 0.1 second,
The operation may not be detected. That is, the switch
In general, monitoring the operation status of the switch and temperature setting means is performed in the main flow .
If the operation time is longer than the operation time of the switch or the temperature setting means (for example, 0.5 seconds), the operation of the switch or the temperature setting means may be overlooked. Therefore, in the present invention, by providing monitoring means independent from the main flow, monitoring of the operation states of the switches and the temperature setting means is performed by, for example, a 100 Hz timer interrupt .
The operation of the switch or the temperature setting means can be reliably detected. Embodiments of the present invention will be described below. FIG. 4 shows an embodiment of the air conditioner according to the present invention. In the figure, components denoted by the same reference numerals as those in the conventional example of FIG. 1 have the same components and the same symbols, and the actuators 12, 13, and 14 are respectively I / 043d of the microcomputer 43. It is connected to the. A three-way valve 51 is connected to the vacuum tank 11, and the power servo 7 is connected to the three-way valve 51 via an on / off valve 50. The power servo 7 is provided with a feedback potentiometer 8 and an air mix door 15. The on / off valve 50 and the three-way valve 51 are connected to the I / O 43 d of the microcomputer 43.
Controlled by a signal from Also, blower motor 2
2 is connected to a blower motor drive circuit 49, which is connected to the microcomputer 4
3 I / O 43d. The microcomputer 43 includes an I / O 43d, a CPU 43a, and an RO
M43b, RAM 43c, and timer 43e. I of this microcomputer 43
A multiplexer 44 is connected to / O43d via an AD converter 45. The I / O 43 d of the microcomputer 43 is connected to the multiplexer 44. 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, a temperature display panel 42 is provided at an appropriate place in the vehicle compartment. The temperature display panel 42 includes a display element 42A for digitally displaying a set value of a desired vehicle interior temperature, and a current vehicle interior temperature. 42B to digitally display
And a temperature setting switch 41 corresponding to the temperature lever 3 in the conventional example of FIG. 1 for selecting a desired cabin temperature, and for selecting the on / off state of the air conditioner and the state of air blowing. , An off mode, an on-auto mode, and a defroster mode. A display drive circuit 52 is connected to the display elements 42A and 42B of the temperature display panel 42.
2 is connected to the I / O 43d of the microcomputer 43. The temperature setting switch 41 and the mode switch 40 are connected to the
/ O43d. This mode switch 40
Are configured so that an off mode, an on auto mode, a defroster mode, and the like can be selected with a single push button. A trimmer 25 is connected to the AD converter 45. The I / O of the microcomputer 43
A switch 46 and a resistor 47 for switching the inspection mode are connected to O43d. The other end of the resistor 47 is grounded. A power supply 48 is connected to the other end of the switch 46. Because of such a configuration,
When an up switch (a switch for increasing the set temperature) or a down switch (a switch for decreasing the set temperature), which is a push button of the temperature setting switch 41, is pressed, the electric signal is input to the I / O 43a of the microcomputer 43. And the microcomputer 43
The microcomputer 43 selects the temperature set value corresponding to the desired vehicle interior temperature, and immediately switches the temperature set value to the temperature set value via the display drive circuit 42. Next, when the on-auto mode is selected by the mode switch 40, the microcomputer 4 receives the on-signal and outputs the signal.
The signal from the mode switch 40 is taken into the CPU 43a via the I / O 43d of No.3. In the 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 changed from the temperature setting switch 41 to the CPU 43 via the I / O 43d.
a, the output value from the outside air temperature sensor 6 and the output value from the inside air temperature sensor 5
The difference X is taken into the CPU 43a via the link 43d, and the deviation X is calculated according to the following equation. ## EQU1 ## [0020] If the value of the deviation X is (-), the value is in the direction of heating, and
When the value of the deviation X is (+), the air mix door 15 is driven in the cooling direction. That is, the deviation X
Is positive, the on / off valve 50 is driven, the power mix 7 rotates the air mix door 15 to the position of 15A, and at the same time, the blower motor drive circuit 49 rotates the blower motor 22 at the maximum air volume. At that time, the intake door 17, the vent door 18, and the floor door 1
9 performs control as shown in FIG. 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 application voltage supplied from the blower motor drive circuit 49 is reduced in accordance with the decrease in the deviation X, and the rotation speed of the blower motor 22 is reduced to reduce the air volume. I will decrease it. That is, as shown in FIG. 5A, when the deviation X exceeds the predetermined value A and further decreases, the voltage applied to the blower motor decreases linearly in accordance with the decrease. When the deviation X reaches the second predetermined value B, the voltage applied to the blower motor becomes constant, and becomes the minimum airflow value of the blower motor 22. When the blower motor 22 reaches the minimum airflow value, the opening degree of the air mix door 15 is controlled as shown in FIG. 5B by the control amount Y to which a time integral term for correcting the residual deviation with respect to the deviation X at that time is added. . This control amount Y
Is determined by the following equation. [Equation 2] That is, until the deviation X reaches the predetermined value B in FIG. 5, the air mix door 15 is fixed at the position shown at 15A, during which the air volume by the blower motor 22 is controlled, and the deviation X exceeds the predetermined value B. Based on the control amount Y at that time, the power servo 7 is driven to drive the air mix door 15 to 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 operation of various temperature sensors will be described. 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 "LO
W ", and it is detected that adjustment is not being performed. When the switch 46 is short-circuited (turned on), the power supply 4
8 is connected to the I / O 43d, and “H
I "and it is determined that adjustment is being performed. Whether the various sensors are adjusted or not is determined based on the on / off state of the switch 46. When the switch 46 is short-circuited, the display of the sensor to be adjusted is displayed from the display of the normal sensor. That is, for example, in the case of the outside air temperature sensor 6, "TA" is displayed on the display element 42A as shown in FIG. The display device 42B indicates a value detected by the sensor shown in the display device 42A, for example, 30 ° C. as shown in FIG. The adjustment of this sensor is performed by operating the trimmer 25 so that the adjustment operator matches the temperature displayed by the accurate thermometer with the detected value from the sensor to be displayed. This series of operations is performed according to the control flowchart of FIG. That is, in step 60, the initial setting of the RAM 43c of the microcomputer 43 and the initialization of the initial state of the I / O 43d are performed. In step 61, the electric signal from the temperature setting switch 41 and the multiplexer 44 The CPU 43a of the microcomputer 43 outputs electric signals from the inside air temperature sensor 5, the outside air temperature sensor 6, and the feedback potentiometer 8
To enter. When the data is input in this step 61, it is determined whether or not the sensor is currently being adjusted in the switch 62, that is, whether or not the switch 46 is turned on. If it is determined in step 62 that adjustment is being performed, the microcomputer 4
3 to determine what to display based on a flag provided in the RAM 43c. When the data to be displayed is determined in step 63, the display object is displayed on the display element 42A and the detected temperature from the sensor is displayed on the display element 42B in step 64 as shown in FIG. In the example shown in FIG. 6, “TA”, that is, the outside air temperature sensor 6
It means that it was detected as ° C. The switching of the display target is performed by operating the switch 40 to change the flag in step 81 described later. That is, during the adjustment, both the display elements 42A and 42B and the switch 40 perform functions irrelevant to the temperature display and mode setting functions in the normal control mode. Each time the switch 40 is operated once, the sensor to be adjusted can be switched. When the sensor name and the temperature are displayed in step 64, the process returns to step 61. As a result, the detected temperature value of each temperature detection sensor, that is, the detection state can be displayed, and by comparing with the actual temperature of that portion, the abnormality of the connection line connected to the sensor can be easily diagnosed visually. Now you can. Next, if it is determined in step 62 that the adjustment is not being performed, a mode process is performed in step 65 according to the information of the mode switch 40 input by a timer interrupt described later. When the mode process is performed in step 65, it is determined in step 66 whether the system is stopped. If it is determined in step 66 that the system is stopped, a process 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, then in step 68, the deviation X is calculated using the input information of the electric signals from the temperature setting switch 41, the inside air temperature sensor 5, the outside air temperature sensor 6, and the feedback potentiometer 8. Then, the control amount Y is obtained by the above-described equations (1) and (2), and the applied voltage to the blower motor 22 is determined according to the characteristics shown in FIG. When the voltage applied to the blower motor is determined in step 68, step 69
The opening of the air mix door 15 is determined. In the above equation (1), Tr 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 Ta is the outside air temperature detected by the outside air temperature sensor 6. It is. Also,
The deviation X is obtained by adding a correction of the outside air temperature to the deviation between the cabin air temperature and the set temperature, and the control amount Y is obtained by adding a time integral term for correcting the residual deviation with respect to the deviation X. When the opening of the air mix door 15 is determined in step 69, the suction port and the discharge port shown in FIG. 2 are determined in step 70 according to the opening of the air mix door 15 calculated in step 69. Is done. When the suction port and the discharge port shown in FIG. 2 are determined, in step 71, the selection mode of the mode switch 40 input in step 65 and step 70
Negative pressure supplied to the actuator 12, the actuator 13, and the actuator 14 is intermittently controlled by the combination of the patterns determined in the above, and is controlled to a predetermined mode. Next, at step 72, the CPU 4 of the microcomputer 43 is connected to the blower motor drive circuit 49 so that the applied voltage of the blower mode 22 calculated at step 68 becomes the same.
A control signal is given from 3a via I / O 43d.
The blower motor 22 is controlled by the control signal in step 72 in accordance with the characteristics shown in FIG. When the air flow is controlled by the air flow control of the blower motor 22 and the air flow of the blower motor 22 reaches the minimum value, in a step 73, the current value obtained from the data of the feedback potentiometer 8 inputted in the step 61 and the temperature data are calculated in a step 69 Then, it is determined whether or not they match with each other, and whether or not they are shifted to 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 it is shifted to 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 it is 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 set temperature is displayed on the display element 42A displayed by the display drive circuit 52 and the vehicle interior air temperature is displayed on the display element 42B in step 74, and the process returns to step 61. . The mode switch 40 and the temperature setting switch 41 are monitored at regular time intervals as shown in FIG. That is, pulses generated from the system clock of the microcomputer 43 are counted by the timer 43e, and key input is performed by a timer interrupt of about 100 Hz generated by the overflow. FIG. 8 shows the control flow.
That is, a key input is performed in step 80, and a mode flag is set in the RAM 43c of the microcomputer 43 in accordance with the input key information in step 81, a process of 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 made at fixed time intervals, and when this timer interrupt occurs, the main flow of FIG.
After the control flow shown in (1) is performed, the main flow is continued again. Therefore, according to the present embodiment, information on an arbitrary sensor can be read out from the inside of the microcomputer 43 and displayed. For example, the true temperature measured by a reference thermometer in the outside air temperature sensor 6 can be obtained. A-D so that the temperatures input by the microcomputer 43 match.
By adjusting with the trimmer 25 attached to the converter 45, matching between the sensor and the control circuit can be easily performed only with the reference thermometer. Further, according to the present embodiment, since each sensor can be adjusted, it is possible to easily find the malfunction of the sensor of each part. As described above, according to the present invention, the following effects can be obtained. That is, whether the monitoring means is the main flow
Switch and temperature setting
Monitoring of the means can be always performed by timer interrupt
When the switch or temperature setting means is operated,
The operation can be reliably detected .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram of a conventional air conditioner. FIG. 2 is a diagram showing a pattern of an air distribution door of the air conditioner. FIG. 3 is a diagram illustrating a method of adjusting a temperature controller of the air conditioner of FIG. 1; FIG. 4 is a configuration diagram showing an embodiment of the automatic air conditioner according to the present invention. FIG. 5 is a control characteristic diagram of a blower motor and an air mix door. FIG. 6 is a view showing a panel of the adjuster of the embodiment of FIG. 4; FIG. 7 is a control flowchart of the embodiment of FIG. FIG. 8 is a flowchart of a timer interruption in the embodiment of FIG. 4; [Description of Signs] 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 panels 42A and 42B Display element 43 Microcomputer 46 Switch 49 Blower motor drive circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60H 1/00 103

Claims (1)

(57) [Claims] Detecting means for detecting temperature information at a plurality of locations such as an outside air temperature and an inside air temperature; temperature setting means for setting a target temperature; An air conditioner for a vehicle, comprising a microcomputer that outputs a control signal for controlling the temperature of the vehicle, wherein the microcomputer determines whether the switch or the temperature setting unit is operated by a timer.
An air conditioner for a vehicle, having a function of monitoring by interruption processing at time intervals .