JPH02106422A - Vehicle airconditioner failure diagnosing device - Google Patents

Abstract

PURPOSE:To specify a diagnosis subject definitely and perform the diagnosis of output devices accurately by selecting the output devices to be subjected to diagnosis by function and automatically operating the selected output devices. CONSTITUTION:A control signal from a microcomputer causes a means 200 to change a normal control mode for controlling various output devices to a failure diagnosis mode for diagnosing the failure of the output devices so that a room temperature is maintained to a temperature set with a temperature setting device 40. During the failure diagnosis mode, the temperature setting device 40 is operated to select the output device to be diagnosed by means of a means 300 by the function. The selected output device is operated automatically according to a specified operation pattern while other output devices are diagnosed and controlled to be fixed to a specified condition by means of a means 400. Thus the diagnosis subject is definitely specified and the diagnosis of the output devices is accurately performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a device for diagnosing a failure of an output device such as a blower of a vehicle air conditioner called an auto air conditioner.

(Prior Art) A vehicle air conditioner that automatically controls various output devices using a microcomputer is configured to perform failure diagnosis of the output devices using a failure diagnosis program built into the microcomputer. There are many. For example, as shown in Japanese Unexamined Patent Publication No. 61-215113, when the air conditioner is switched from the normal control mode to the failure diagnosis mode, the operation of the temperature setting device causes the Air mix door, mode door, intake door,
A system has been proposed that outputs a control signal to a compressor and tests whether or not these output devices operate according to their respective patterns.

(Problem to be Solved by the Invention) However, in such a failure diagnosis device, various output devices such as a blower operate simultaneously when the temperature setting device is operated, so diagnosis cannot be performed in a vehicle interior where direct visual inspection cannot be performed. Unable to identify the target, the only way to determine whether each output device was working properly was by repeating the same diagnostic pattern over and over again. Therefore, there is a strong possibility that an incorrect diagnosis will be made using such a diagnosis method.

Therefore, it is an object of the present invention to provide a failure diagnosis device for a vehicle air conditioner, which makes diagnosis easier by clarifying the diagnosis target, and allows occupants and service personnel to accurately diagnose output devices. .

(Means for Solving the Problems) The gist of the present invention is, as shown in FIG. mode switching means 200 for switching from a normal control mode in which various output devices are controlled by control signals from the output device to a failure diagnosis mode in which failures in the output devices are diagnosed; Diagnosis target selection means 300 that selects diagnosis targets by function, and output devices selected by this diagnosis target selection means 300 are automatically operated based on a predetermined operation pattern, and other output devices are fixed in a predetermined state. The present invention is also equipped with a diagnostic control means 400.

(Function) Therefore, since the diagnostic target can be selected by function by operating the temperature setting device, the diagnostic target can be specified based on the intention of the passenger or service personnel, and only the output device can automatically operate based on the predetermined operation pattern. Therefore, passengers and service personnel can easily determine whether the output device is operating normally or not, and therefore the above-mentioned problem can be achieved.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, the vehicle air conditioner is provided with an intake door switching device 2 on the most upstream side of an air conditioning duct 1, and this intake door switching device 2 connects an intake door to a portion where an inside air inlet 3 and an outside air intake 4 are separated. A door 5 is arranged, and the intake door 5 is operated by an actuator 6 so that the air introduced into the air conditioning duct 1 can be selected between inside air and outside air.

The air blower a7 sucks air into the air conditioning duct 1 and blows it downstream, and an evaporator 8 and a heater core 9 are provided behind this blower 7.

The evaporator 8 includes a compressor 10 and a capacitor 11.
, liquid tank 12 and expansion valve 13
The compressor 10 is connected to the engine of the automobile via an electromagnetic clutch 15, and is controlled on and off by connecting and connecting the electromagnetic clutch 15. Further, the heater core 9 is configured to circulate engine cooling water and heat the air. An air mix door 16 is provided in front of the heater core 9.
By adjusting the opening degree using the actuator 17, the amount of air passing through the heater core 9 and the amount of air bypassing the heater core 9 can be changed, and as a result, the temperature of the blown air can be controlled.

The downstream side of the air conditioning duct 1 is divided into a defrost outlet 18, a vent outlet 19, and a foot outlet 20, which open into the vehicle interior, and a mode door 22a is provided in the divided part.
, 22b are provided, and a desired blowing mode can be obtained by operating the mode doors 22a, 22b with actuators 23 and 24.

The actuators 6, 17, 23, 24, the blower motor, and the electromagnetic clutch 15 of the compressor 10 are controlled based on output signals from the microcomputer 31 via drive circuits 498 to 49e, respectively.

This microcomputer 31 includes a central processing unit (CPU), a read-only memory (ROM), a random access memory (RAM), and an input/output board (I/O port (not shown)).
10), etc., and the microcomputer 31 selects a signal from a vehicle interior temperature sensor 25 etc. that detects the temperature inside the vehicle via a multiplexer 29, and selects a signal from an A/D converter. The signal is converted into a digital signal and input via 30.

The microcomputer 31 also includes an operation panel 34.
The output signal from is input. This operation panel 34 is
an AUTO switch 35 that cancels the stop mode or manual operation state and sets all air conditioning equipment such as blowers to the automatic state; an OFF switch 36 that commands the stop mode;
A/C switch 37 that operates the compressor 10, intake switch 38 that switches the intake mode between internal air intake mode (REC) and outside air intake mode (FRESH), and DE that sets the blowout mode to defrost mode (DEF).
It is provided with an F switch 39, a temperature setting device 40 for setting the set temperature in the vehicle interior, a blowing capacity setting device 41 for setting the blowing capacity, and a blowing mode setting device 42 for setting blowing modes other than the defrost mode.

The temperature setting device 40 has an up/down switch 43a.

43b and a temperature display section 44 that digitally displays the set temperature, and an up/down switch 43a.

By operating 43b, the set temperature shown on the temperature display section 44 can be changed within a predetermined range.

The blower capacity setting device 41 also includes a FAN switch 45 that changes the rotation level of the blower 7 and a level display section 46 that displays the current rotation level.
The rotation level stops (level 0), LOW (
Level 1), MED (shi.

Level 2) and Hl (Level 3) are sequentially switched, and the word MANUAL' is lit at the top of the level display section 45.

Further, the blowout mode setting device 48 sets the blowout mode to vent (
VENT), pie level (Bl-L), heat (HE
AT), then differential heat (D/H).
It consists of an ODE switch 47 and a pictorial display section 48 that shows the current blowout mode in pictorial form.
8c is lit to indicate the selected speech bubble mode, and the word "MANUAL" is lit at the top of the picture display section 48. These lighting displays and each display section 44, 46, 48 The display is controlled by the microcomputer 31 via the display circuit 50.

FIG. 3 shows an outline of an example of control by the microcomputer 31 described above as a functional block diagram. Enters normal control mode that controls output devices such as blowers to maintain temperature. Then, in this normal control, the above-mentioned A
When the UTO switch 35 and DEF switch 39 are pressed at the same time, the failure diagnosis mode is entered and the display section 44.46°48
Indicators are checked, such as turning on lights.

The inspection of this indicator is completed in a predetermined time, and after the predetermined time has elapsed, it is checked whether the current signal system is normal, such as whether the signal from the vehicle interior temperature sensor 25 etc. is being input to the microcomputer 31. The temperature is inspected and the result is displayed on the temperature display section 44 using a predetermined code.

If the A/C switch 37 is pressed while the signal system is being inspected, the past signal system inspection results are displayed on the temperature display section 44 with a predetermined code, and the A/C switch is turned off again.
When the switch 37 is pressed, the process returns to checking the current signal system.

In addition, the results of past inspections of the signal system indicate that the AUT
By pressing the O switch 35 and the intake switch 38 at the same time, the memory storing the information is reset and erased.

Further, when the AUTO switch 35 is pressed during inspection of the current signal system, the blower 7, air mink store 16,
The mode doors 22a, 22b, the intake door 5, the combination air conditioner 10, and other output system air conditioning equipment are tested for operation, and when the AUTO switch 35 is pressed again, the process returns to the inspection of the current signal system.

And the failure diagnosis mode is set to the ignition switch (
It can only be canceled by turning off IG).

The above-mentioned operation diagnosis of the output system is specifically as shown in the flowchart of FIG.
Step 60 occurs when the TO switch 35 is turned on.
Execution of the program is started from , and in the next step 62, variables M and S, which will be used later, are both initialized to "1". Here, M is a variable used to select a diagnosis target classified by function as shown in FIG. 5, and S is a variable for controlling the diagnosis target based on a predetermined operation pattern.

Then, in steps 64 and 66, it is determined whether or not the up/down switches 43a and 43b have been pressed, and if the up/down switch 43a has been pressed, M is set to "
1" is added to change the diagnosis target to the next target, and after M is 4", M is returned to "1" in steps 68 and 70. Further, if the down switch 43b is pressed, step 80
subtract "1" from the value of M to return the diagnosis target to the previous target, and if M is "l", M is set to "4" in step 76.78.
Therefore, the selection of the diagnosis target is performed by operating the up/down switches 43a and 43b, and the same target continues to be diagnosed unless operated.

Further, when the up/down switches 43a, 43b are pressed, the variable S is set to "1" (step 74.8).
2), then proceed to step 84 and S
It is determined whether or not is "1". If S=1, the basic settings for diagnosis are step 8G.
The setting is fixed to this setting except for the diagnosis target selected by M. Specifically, the blower (FAN) 7 is
The air mix door (MIX) 16 is opened to 50%, and the mode doors (MODE) 22a, 22b
to the vent mode position, stop (OFF) the oscillating movement (StING) of the air outlet grill (not shown) provided at the vent air outlet 19, and turn off the intake door (INTAKE).
5 to the outside air introduction position (FRESH), and set the compressor (A/C) 10 to ON. The opening degree of the air mix door 16 is at full cool W (position ■ in Figure 2).
0χ at full heat position (position 1 in Figure 2) 100%
It is said that On the other hand, if it is determined in step 84 that S is not "1", step 86 is bypassed and the process proceeds to step 88.

In step 88, it is determined whether or not a predetermined time of 1 degree has elapsed since S was set to "1" and the basic setting was performed. If it is within the predetermined time, S is set to "1" in step 90. After updating S by adding , proceed to step 92, and if a predetermined time has elapsed, proceed to step 92 without updating S.
Proceed to. Then, in steps 92 to 98, M
When M is '3', S is changed from '1' to '5', and when M is other than '3', S is changed from '1' to '4'. Note that the above-mentioned t is The time period is set to be sufficient for the diagnostic target selected in M to perform at least the operation pattern shown in FIG. 5 at least - times.

In steps 100, 102, and 104, processing is performed to identify the diagnosis target using M. If M=1, the process proceeds to step 106, and each time S is updated, the blower (
FAN) 7 is automatically switched to OFF, LOW, MED, and HI, "1-0-" is displayed on the temperature display section 44 to clearly indicate the diagnosis target (step 108), and the level display section 46 is Display the level corresponding to S. Also,
If M=2, the process proceeds to step 110, and S sets the opening degree of the air mix door (MIX) 16 to 0% and 5%.

It automatically switches between 100% and 50%, and the temperature display section 44 shows, for example, "20.0" for 0% and "" for 50%.
20.5" If it is 100%, "21.0" is displayed and the opening degree is clearly indicated along with the diagnosis target (step 112).M
If =3, the process proceeds to step 114, and mode door (MODE) 22a is opened by S.

22b is VENT, Br-L, HEAT, H/D.

It automatically switches to the DEF position, turns 5WING ON in VENT and BL-L, turns it OFF in other mode positions, displays "3-1-" on the temperature display section 44, and
The picture display section 48 displays the balloon mode corresponding to S.

Furthermore, if S=4, the process proceeds to step 118, and the intake door (INTAKE) 5 is set to F RE S by S.
H, RE C, FRESH.

In addition to automatically switching to REC, the compressor (A/C) is turned on until S=2 and turned off after S=3, and "4-3-" is displayed on the temperature display section 44.

Therefore, if the blower 7 is normal, the vent outlet 19
The amount of air blown out from the air mix door 16 gradually changes.
If it is normal, the blowing temperature changes and the mode door 22a,
If 22b is normal, the air outlet will change and 5WIN
If the G function is normal, the direction of the air blown out from the vent outlet 19 will change, and the air will be blown out from the intake door 5 and compressor 10.
If it operates normally, the hot water temperature should change, and if you check this change by feeling it while looking at the display on the temperature display section 44, etc., you can confirm that each output device is working normally. can be recognized.

After steps 108, 112, 116, and 120, the process proceeds to step 122, where the up/down switch 4
It is determined whether manual switches other than 3a and 43b have been operated, and step 86 is determined based on the manual switch.
If a state different from the basic settings is set, the basic settings can be changed except for the diagnosis target selected in M and the air mix door 16 (step 124).
, if the manual switch is not pressed, or after the process of step 124 is performed, the process returns to step 64.

(Effects of the Invention) As described above, according to the present invention, output devices to be diagnosed are selected by function by operating a temperature setting device, and the selected output devices are automatically operated according to a predetermined operation pattern. Therefore, the diagnosis target becomes clear and diagnosis becomes easier, and passengers and service personnel can accurately diagnose the output device while remaining in the vehicle.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing the present invention, FIG. 2 is a configuration diagram showing an embodiment of the invention, and FIG. 3 is a functional block diagram showing an example of control by the microcomputer in the above.
FIG. 4 is a flowchart showing a specific example of the operation diagnosis of the output system in the same as above, FIG. 5 is a list showing operation patterns used in the operation diagnosis in the same as above, and FIG. 6 is a chart showing conventional operation diagnosis. 5...Intake door, 7...Blower, lO...
Compressor, 16...Air mix door, 22a. 22b...Mode door, 31...Microcomputer, 40...Temperature setting device, 200...Mode switching means, 300...Diagnosis target selection means, 4001. - Diagnostic control means. Figure 6 Figure 1

Claims (1)

[Scope of Claims] A failure diagnosis for diagnosing a failure of the output device from a normal control mode in which various output devices are controlled by control signals from a microcomputer so as to maintain the vehicle interior temperature at a temperature set by a temperature setting device. mode switching means for switching to a mode; diagnostic target selection means for selecting a diagnostic target of the output device by function by operating the temperature setting device in the failure diagnosis mode; What is claimed is: 1. A failure diagnosis device for a vehicle air conditioner, comprising a diagnostic control means that automatically operates based on an operation pattern and fixes other output devices in a predetermined state.