JPS592919A - Control device of air conditioner for automobile with display function of control variable - Google Patents

Abstract

PURPOSE:To contrive to prevent monitor mode from continuing unfavorably due to the occurrence of trouble by a method wherein the shifting from normal operating control to monitor mode and following automatic return to normal operating control afger the elapse of a certain fixed period of time is performed by giving a predetermined input to a specified signal line. CONSTITUTION:Reset signals are given to CPUs 42 and 43 by putting the power supply to work or the like. Via the signal line 56 for monitor mode, the shifting to monitor mode is accomplished with a switch 37. Then, a timer T is reset to ''0''. The processing in monitor mode is to be carried out for a period of time controlled with the timer T. If the monitor signal is turned OFF in the midway of monitor mode, the processing in monitor mode is interrrupted and the state is returned to the step as was before the shifting to monitor mode. Accordingly, if the signal line 57 is left being turned ON for some trouble or other, the processing in monitor mode is accomplished for a certain fixed period of time T0 and, after that, the state is returned to the step as was before the shifting to monitor mode in order to accomplish normal operating control. consequently, monitor mode can be accomplished without impairing the original controlling function of the air conditioner.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioning control device for an automobile that displays a control variable value of an air conditioner.

Automotive air conditioning control equipment with a monitor mode allows you to know the control status inside the air conditioner while it is installed in the car without using a dedicated inspection device, making it extremely effective for maintenance and inspection of the air conditioner. Also, some actuators maintain the operating state immediately before switching to monitor mode, so if you switch from monitor mode to normal operation mode, or accidentally switch to monitor mode during normal operation, It has the excellent feature that there is extremely little discomfort in air conditioning control when changing modes.

By the way, this type of device is designed to switch to monitor mode when a predetermined input is given to a specific signal line, but for some reason a problem occurs in that signal line and the monitor mode is unexpectedly switched. It has been discovered that if this happens, the monitor mode will continue indefinitely, making it impossible to return to normal operation control.

Taking this into consideration, for example, a device may be designed in which the transition to the monitor mode is determined only when the power is turned on, and after executing the monitor mode when the power is turned on, the device is always in the normal operation mode. Since one of the main purposes is to analyze the operation of the power supply A, it is undesirable that the power supply C becomes powerless against abnormal symptoms that would be recovered by turning off the power supply A.

The present invention provides C1 normal operation control)1 by giving a predetermined input to a specific signal line during execution of normal operation control.
Automatic heavy-duty air conditioning control eliminates the above-mentioned problem by switching to monitor mode and then automatically returning to normal operation control after a preset period of time has elapsed. The purpose is to provide equipment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a widely used automobile air conditioning control device of a cold air/warm air mixing type will be described below with reference to the drawings.

First, Figure 1 shows the entire air conditioning system that we have installed, with an outside air intake port 2 and an inside air intake 1 on the upstream side of the ventilation die 1.
3a and 3b are provided, and internal and external air switching dampers 4a and 4b are provided.
Outside air or inside air is selectively sucked into the ventilation duct 1 by opening and closing of
It can be opened and closed by 6b. , 7 is an electric blower m<prower motor)'' installed in the ventilation die 1-1.
The C1 suction lv air is blown to the downstream side of the ventilation duct 1.

Refrigeration 1 no-cycle includes refrigerant evaporator (evaporator) 8,
It is composed of an expansion valve 9, a liquid receiver 10, a condenser 11, and a compressor 14, which are driven by an automobile engine 13 via an electromagnetic clutch 12. The air passing through 1 is cooled.

15 is a heater (heater core) that takes the cooling water of the engine 13 as a heat source, and is installed in series downstream of the refrigerant evaporator 8 in the ventilation duct]-1, and is connected to a solenoid valve (Wooter valve) 16.
controlled by Reference numeral 17 denotes a temperature adjustment damper (air mix damper), which is provided in front of the heater 15 and controls the amount of air passing through the heater 15 and heated, and the bias passage 18.
By adjusting the ratio of the amount of low-temperature air passing through the damper 17 to the amount of low-temperature air passing through the damper 17, the opening degree of the temperature adjusting damper 17 is adjusted by a diaphragm actuator 19. 20 is a negative pressure regulator that adjusts the negative pressure supplied to the die and diaphragm actuator 19, and has two built-in solenoid valves 21 and 22.
3 and a popular exhaust port 24 are configured to open and close, respectively, and the intake negative pressure of the engine 13 is applied to the negative pressure pipe 23, and the opening degree of the temperature adjustment damper 17 can be detected by a potentiometer 25. : It is being used as a sea urchin.

26 is a heating outlet that blows warm air to the passenger's feet in the car interior, and 27 is a differential outlet that blows hot air to the front window glass.
The cooling air outlet 28 blows out cold air toward the upper body of the occupants in the room.Switching of each outlet is performed by blow-out mode switching dampers 29, 30, and 31. 29 is a switching damper for heating, which is opened and closed by a diaphragm actuator 33 controlled by a solenoid valve 32;
Reference numeral 1 designates a differential and cooling switching damper, which is opened and closed by a diaphragm actuator 35 controlled by a solenoid valve 34.

Next, FIG. 2 is a block diagram of a control circuit, in which a microcomputer 36 receives various information signals and performs processing such as screening according to a preset control program based on the information signals, thereby controlling the air conditioning system 1. various actuators, namely solenoid valves 5a and 5b.

It electrically commands the operations of 16, 21, 22, 32, 34, etc., and controls the entire air conditioner, and is composed of the following parts.

37 is a panel switch for switching various operation modes, 38
is a selector for selecting the input of the panel switch 37, 39
41 is an analog switch that selects each input signal from various sensors 40 including an inside air sensor, an outside air sensor, a solar radiation sensor, an after-evaporation sensor, a water temperature sensor, a potentiometer 25, etc., and 41 is an analog switch that converts the analog signal from the analog switch 39 into a digital signal. The converting A/D conversion circuit, 42, is a central processing unit (hereinafter referred to as CPU) that has a built-in control program.
43 is a CPU with a built-in output signal control program, 44 is a setting display that displays the set temperature, 45 is a lamp driver that drives the mode display lamp 46, and 47 is a display for each scale. El-Y48, namely the above type, magnetic needles 5a, 5b, 1G, 21.22.32.
3/l and heater relay (not shown) and M (actuator for driving +C relay) - one driver; 49 drives blower motor 50; 5'I is lock for blower motor 50; detection circuit, 5
2 is a bridge 153 that sounds when there is a valid input from the panel switch 37, which is a backup and relay 1.
- Shinyumi's control circuit 54 is a constant voltage power supply circuit, which is connected to the variable valve 55 via the engine ignition switch. Further, a monitor top signal line 56 is connected to the CPIJ 42, and a night light dimming circuit 57 for lighting and dimming the light at night is further connected to the mode display lamp 46.

Next, FIG. 3 shows the control program. −
1-, the processing represented in each step will be explained below.

100 is the CPU 42 when the power is turned on, etc. , 43 represents a step in which a signal is applied to start execution of the program.

101 sets the monitor mode prohibition flag (MDF) to "0"
Represents a step to perform initial settings such as setting the
The monitor mode prohibition flag (MDF) is 1m I-I
When set to J, monitor mode is prohibited.

Reference numeral 102 indicates whether a monitor signal for instructing transition to monitor mode is ON or OFF via a monitor mode signal line 56.
represents the step of determining whether

103 represents a step of resetting the monitor mode prohibition flag (MDF) to "0" when the monitor signal is OFF in step 102].

104 represents a step in which the CPUs 42 and 43 measure and output control signals for each actuator and blower motor based on inputs from each sensor and the like during normal operation control.

105 indicates a step of checking whether the monitor mode prohibition flag (MDF) is [1] when the monitor signal is ON in step 102; 1°106 indicates the step 105 F, -E monitor mode prohibition flag; 5
ri (MD F ) is r 1 ,! When 'Q' is 3, it represents the step of resetting it to '1'.

'I07 represents the step of resetting the timer [01], and the monitor mode processing is performed only for the time controlled by the timer 1.

'108 is monitor mode actual 1) monitor type E4 Fj
1 represents the step of determining whether or not the monitor is turned off, and when the monitor (, i5'; is turned off, the process of the monitor mode is interrupted and the process returns to step 102
゜109 means that tine 1- exceeds 1゜ for a preset period of time. : Represents the step ′ that determines whether or not, and the timer [
is constant IIi! li! When I T (l) is exceeded, the monitor mode processing is interrupted and the process returns to step 102.

110 is the time set by timer 1 (monitoring and processing, i.e., displaying the control variables immediately before executing the monitor mode on the set temperature display 4°4 according to the distance from the switch panel) Step 10
8. 109 and the step 110 etc. constitute a closed loop,
During the fixed time period 1-0, the monitor mode processing is continued.

Therefore, for example, if the monitor mode signal line 56 is left ON due to some kind of failure, after executing the monitor mode processing for a certain period of time, the process returns from step 109 to step 102, and then in step 106. Since the monitor mode prohibition flag (MDF) is set in rlJ, the process advances to step 104 via step 105, and normal operation control is performed.

Next, FIG. 4 shows an example of a display panel.
is a set temperature display which displays the set temperature in the normal operation mode, while in the monitor mode the indicated control variable value is displayed, 72 to 80 are panel switches 37, and 72 indicates the actuator output. ° switch for displaying, 73 is a switch for displaying the blower level, 74 is a switch for displaying the required air flow m11, 75 is a switch for displaying the damper opening degree, 76 is a switch for displaying the inside air temperature, and 177 is a switch for displaying the outside air temperature. 78 is a switch for displaying evaporator temperature, 79 is a switch for displaying radiator water temperature, and 80 is a switch for displaying solar radiation equivalent temperature. Further, each switch 72 and -80 also serves as a mode display lamp/16.

Next, FIGS. 5a and 511 show the normal control step 104 in the frontier 1~ of FIG. 3, and the immediate step 110 of the monitor 7 board. This corresponds to the case where it is operated by the panel switch shown in Fig. 4).

In the case of monitor mode, in steps 301 to 309 it is determined whether each switch on the display panel is on or off, and if there is an input to each switch, processing for displaying people is performed in steps 310 to 325, and in step 326 Display is performed. Then, in step 327, the output for the specified number 7 is output and the history is entered in step 328.3.
29. Execute 330 to detect -C tamper position, damper opening control output, motor lock detection, and motor control output. The control variable values to be displayed are inside temperature (TR), outside temperature (TAM ), solar radiation (ST)°, evaporator temperature (TE), radiator water temperature (TW), required blowout temperature (
TAO), temperature adjustment damper opening (SW), blower air volume (
BWR) and the output of various actuators.

Also, (TR), (TAM), (TE), (TW), (
ST) uses 8-bit binary numbers in the internal calculation of the computer, for example, Haku1'00J is (TR), (TAM
), (TE) is -17.5°C, (TW) is 22.5°C, and (ST) is solar radiation rOJ. Further, (TAO) uses a 16-bit binary number, and for example, the value r4000J corresponds to 0°C. (
SW) uses an 8-bit binary number, for example, the value [29] is 0.
%, and (BWR> represents the air volume level using a 4-bit binary number.

Then, each control variable value (TR), (TAM>, (TE), (1-W), (ST
) and (T A O) respectively display the temperature in decimal notation, and (
SW) indicates the opening degree in 2 hexadecimal digits, and the output b (m is for example 8 scale output ON, A) of each actuator corresponds to each bit "11", "0", Displayed in 2 hexadecimal digits (8 bits), set temperature display 71 on the panel.
The decimal place is damper control output (MVH) and (MMC)
Accordingly, (MVH=ON) and (MVC=OFF>1゛5'', (MVI-1=OFF) and (
“0” if MMC=ON), (MVH=ON) r (
When MMC=ON), it is displayed as "8".

Therefore, if the switches 72 to 80 on the display panel are pressed one after another to make an input, the corresponding control variable value will be displayed on the set temperature display 71, and the control state immediately before switching to the monitor mode can be confirmed.

In this way, while the t monitor mode is running, the input values of ゛ (each second sensor 1) are not processed, and these input values are held at the values immediately before transitioning to the monitor mode, and the humidity adjustment damper 1
7 is normally controlled and stops after reaching the target value set based on the input value held by each sensor, and the air conditioning system stops due to failures during the function stop, such as processing when the blower motor is locked. Things that cause damage inside and outside the system are controlled in the same way as normal operation control.

As described above, the present invention provides an air conditioning control for an automobile that has a monitor mode that calculates and commands control signals for an air conditioner based on signals from various ranges υ, and displays control variable values of the air conditioner by inputting a panel switch. The device is configured to shift from normal operation control to monitor mode by applying a predetermined input to a specific signal, and to return to normal operation control after a preset certain period of time has elapsed.

Therefore, according to the present invention, even if there is a problem with the signal line that commands the transition to monitor mode and the monitor signal remains on, the monitor mode will automatically switch to normal operation control after a certain period of time. This has the effect of allowing the monitor mode to be executed without any loss in the original air conditioning control function.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is an explanatory diagram showing the entire air conditioner, Fig. 2 is a block diagram of the control circuit, and Fig. 3 is an explanatory diagram showing the entire air conditioner.
Figure 4 is a flowchart showing an overview of the control program and damper, Figure 4 is a front view showing an example of the display panel, Figures 5a and 5.
Figure b shows detailed flowcharts of normal control processing and monitor mode processing, respectively.
... Compressor 15 ... Heater 17 ... Temperature adjustment damper 25 ... Bodensiometer 5a, 5b, 16.21.22.32.34 ... Solenoid valve 36 ... Microcomputer 37 ...・Panel switch 40...sensor 42.
43... CPU 44.71... Set temperature display 48... Actuators 72-80... Panel switch Figure 3 Figure 4

Claims (1)

[Claims] Based on various L-ring signals, empty vAI! ! In an automobile air conditioning control system, the monitor mode is set to display the control variable value of the air conditioner by inputting the panel switch. This automotive air conditioning control system is characterized in that it is configured to shift from normal operation control to monitor mode by giving a , and return to normal operation control after a preset period of time has elapsed. Device.