JPH09286223A - Fault diagnosis device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply diagnose faults in plural actuators in an air conditioner. SOLUTION: At the diagnosis of faults in actuators in an air conditioner, such as a servomotor for a circulation-or-ventilation selector door 5, a blower motor 7, an electromagnetic clutch 9, a servomotor for an air-mixing door 18 and servomotors for venting-mode selector doors 22 to 24, venting-mode switches provided on an air conditioner panel are successively turned on to change the fault diagnosis patterns for the air conditioner actuators. Thus the simple turning-on operation of the venting-mode switches enables the diagnosis of faults in the air conditioner actuators.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure diagnosing device for diagnosing a failure of a plurality of air conditioning actuators provided in a vehicle air conditioner.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 6-15291 discloses a device for diagnosing a failure of a plurality of air conditioning actuators of a vehicle air conditioner. Specifically, this failure diagnosis device, when changing the set temperature of the temperature setter, changes the mode of the air conditioning actuator (position of the air mix door,
A pattern is stored in which the blowout mode, the position of the inside / outside air switching door, the on / off state of the compressor, and the like) change sequentially.

At the time of failure diagnosis, the mode of the air conditioning actuator is controlled so as to change sequentially based on a pattern corresponding to the set temperature at that time. At this time, it is possible for the inspector to perform a failure diagnosis of the air conditioning actuator by checking whether or not the actual mode of each air conditioning actuator with respect to the set temperature and the mode based on the pattern match. Is.

[0004]

By the way, as a matter of fact, it is sufficient to provide at least four or five patterns as the number of patterns necessary for performing the failure diagnosis. That is, as for the blowout mode, it is sufficient if a total of 4 or 5 modes including the face mode, the bilevel mode, the foot mode, and the defroster mode (in some cases, the foot differential mode) can be obtained at the time of failure diagnosis. The failure diagnosis in the blowout mode is possible.

Regarding the blower, at the time of failure diagnosis,
If a two-stage or three-stage air volume mode can be obtained, the blower can be sufficiently diagnosed for failure. Similarly,
As for the inside / outside air mode, if the two modes of the inside air circulation mode and the outside air introduction mode can be obtained at the time of the failure diagnosis, the failure can be sufficiently diagnosed, and the position of the air mix door can be the maximum cooling position and the maximum heating at the time of the failure diagnosis. If a total of 2 or 3 modes of the position (possibly the intermediate position) are obtained, the failure diagnosis can be sufficiently performed.

As can be seen from the above, the number of modes required for the fault diagnosis is the blowing mode, and the number is four or five. Therefore, the number of the patterns required to perform the failure diagnosis is the same as the number of modes required for this blowout mode, and is four or five. However, in the conventional device that changes the pattern according to the set temperature, the following problems occur when providing four or five patterns at most as described above.

That is, the set temperature has a wide set range such as 18 to 32 (° C.).
Therefore, the operating range is, for example, 5 for a wide set temperature.
If you want to provide two patterns, for example, 18
(° C), 22 (° C), 25 (° C), 28 (° C), 32
It is set so that each pattern can be obtained when the set temperature is adjusted to each point such as (° C.).

In this case, the set temperature is 18 (° C.) or 3
In order to adjust the temperature to 2 (° C), it is only necessary to operate the temperature setting device at both ends of the operating range, so the operation by the inspector is simple. However, when adjusting the set temperature to, for example, 22 (° C), 23
Since it will be (℃) or 21 (℃), it must be adjusted carefully. This means that the set temperature can be
The same applies when the temperature is adjusted to 5 (° C) and 28 (° C).

As described above, since the above-mentioned conventional apparatus is configured to change the pattern according to the set temperature, the operability of the inspector is very high when the number of patterns is four or five. Problems such as bad will occur. Then, this invention aims at solving the said problem.

[0010]

In order to achieve the above-mentioned object, the invention according to claims 1 to 3 is arranged such that the failure diagnosis patterns for a plurality of air conditioning actuators are stored in the storage means in correspondence with the respective blowing modes. It is stored as a different pattern. When the diagnosis instruction signal is input to the failure diagnosis control means, that is, when the failure diagnosis is performed, the blowout mode set by the blowout mode setting means is selected from the plurality of failure diagnosis patterns stored in the storage means. A feature is that a pattern corresponding to a mode is selected and a plurality of air conditioning actuators are controlled so as to obtain the selected pattern.

According to this, as described above, as the number of the above-mentioned patterns necessary for performing the failure diagnosis of the air conditioning actuator, the number of the blowing modes is sufficient, and the present invention focuses on this. And then as above
By switching the setting mode by the blowing mode setting means, each of the above patterns can be obtained in order. Therefore, the inspector can perform a failure diagnosis of each air conditioning actuator by a simple operation of operating the blowout mode setting means in order.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment in which the failure diagnosis apparatus of the present invention is applied as a failure diagnosis apparatus for an automobile air conditioner will be described with reference to FIGS. First, FIG.
The configuration of the air conditioning unit 1 of the vehicle air conditioner for air conditioning the front seat side space in the vehicle compartment will be described with reference to FIG.

At the air upstream side of the air conditioning case 2, an inside air inlet 3 for sucking inside air, an outside air inlet 4 for sucking outside air, and an inside / outside air switch for opening / closing these inlets 3, 4. A door 5 is provided. The inside / outside air switching door 5 is a servo motor 4 as an air conditioning actuator.
0 (see FIG. 3). At the downstream side of the inside / outside air switching door 5, a fan 6 as a blower is arranged. The fan 6 is driven by a blower motor 7 as an air conditioning actuator, and the rotation speed of the fan 6, that is, the amount of air blown into the vehicle interior, is controlled by the blower motor 7.
It is controlled by the blower voltage applied to.

On the downstream side of the fan 6, an evaporator 8 serving as an air cooling means is arranged. The evaporator 8 includes a condenser 12 and a gas-liquid separator 13 in addition to a compressor 11 that compresses a refrigerant when a driving force of an automobile engine 10 is transmitted via an electromagnetic clutch 9 serving as an air conditioning actuator. ,
A well-known refrigeration cycle 15 is configured together with the expansion valve 14 as the pressure reducing means.

A heater core 16 as an air heating means is arranged in a portion of the air conditioning case 2 on the air downstream side of the evaporator 8. The engine cooling water flows inside the heater core 16, and the heater core 16 uses the cooling water as a heat source.
It reheats the air passing through. In addition, a bypass passage 17 is formed in the air conditioning case 2 so that the cool air from the evaporator 8 bypasses the heater core 16.

Further, in the air conditioning case 2, the heater core 1
Air mix door 1 as temperature adjusting means for adjusting the ratio of the amount of cool air passing through 6 and the amount of cool air passing through bypass passage 17.
8 are provided. The air mix door 18 is driven by a servo motor 41 (see FIG. 3) as an air conditioning actuator. Further, in the downstream side portion of the air conditioning case 2, a face opening 19 for blowing air to the upper half of the passenger in the passenger compartment, a foot opening 20 for blowing air to the feet of the passenger in the passenger compartment, and an inner surface of the windshield are provided. A defroster opening 21 for blowing out air is formed.

Blowout mode switching doors 22 to 24 are provided at the upstream side portions of the openings 19 to 21, respectively. These doors 22 to 24 are driven by a servomotor 42 (see FIG. 3) as an air conditioning actuator and a blowout mode actuator. Next, the configuration of the air conditioning panel 25 of this embodiment will be described with reference to FIG.

The air conditioning panel 25 shown in FIG. 2 is provided on the instrument panel in the vehicle compartment, and the defroster switch 26, the rear defogger switch 27, and the rear defogger switch 27 are provided on the surface of the instrument panel.
Inside / outside air switch 28, air conditioner switch 29, blowout mode switch 30 as blowout mode setting means, blower switch 31, off switch 32, auto switch 33,
And a temperature setter 34 is provided. The switches 26 to 33 are all push-type switches.

The defroster switch 26 is a switch for setting the blowout mode of the air conditioning unit 1 to the defroster mode. The rear defogger switch 27 is a switch for energizing the heating wire of the rear glass. The inside / outside air switch 28 is a switch for setting the inside / outside air mode of the air conditioning unit 1. The air conditioner switch 29 is
This is a switch for driving the compressor 11 by energizing the electromagnetic clutch 9.

The blowout mode switch 30 is a switch for setting the blowout mode of the air conditioning unit 1 among the face mode, the bi-level mode, the foot mode, and the foot diff mode by sequentially turning on. The blower switch 31 is a switch for setting the rotation speed of the fan 6. The off switch 32 is a switch for stopping the air conditioning actuators 7 and 9. The auto switch 33 includes the actuators 7,
A switch for automatically controlling 9, 40 to 42. The temperature setting device 34 is a setting device for setting the temperature inside the vehicle compartment.

Further, the air conditioner panel 25 has an indicator 3
5a to 35m are provided. For example, when the face mode is set by the blowing mode switch 31, the indicator 35c lights up. Next, the configuration of the control system of the present embodiment will be described with reference to FIG. The air-conditioning control device (hereinafter referred to as ECU) 36 includes a CPU (not shown) and an R (not shown).
A well-known microcomputer including an OM (memory means in the invention according to claim 1), a RAM, etc., a drive circuit for controlling a blower voltage applied to the blower motor 7, an A / D conversion circuit, etc., and an ignition of the engine 10 are provided. Power is supplied from the battery 38 when the switch 37 is closed.

A detection signal from a sensor group 39 for detecting an air conditioning environment in the vehicle compartment is input to an input terminal of the ECU 36, and the switches 26 to 3 of the air conditioning panel 25 are input.
3 and the signals from the temperature setter 34 are also input. The signals from the sensor group 39 are A / D converted by the A / D conversion circuit and then input to the microcomputer.

A control signal is output from the output terminal of the ECU 36 to each of the air conditioning actuators 7, 9, 40 to 42. Then, the ECU 36, when the auto switch 33 is turned on by the occupant, based on the temperature set by the temperature setter 34 and the detected values detected by the sensor group 39, the air conditioning actuators 7, 9, 40 to. The control target value of 42 is calculated, and each actuator 7, 9, 40-42 is calculated based on this control target value.
Control.

Further, the ECU 36 uses the switches 26
When ~ 33 is turned on, the heating wires of the actuators 7, 9, 40 to 42 and the rear glass are controlled so as to be in the operated mode. Next, the failure diagnosis process performed by the microcomputer will be described with reference to the flowcharts of FIGS. Note that this failure diagnosis processing is an essential part of this embodiment.

Inside / outside air switch 28 and auto switch 33
When the ignition switch 37 is turned on while both are turned on at the same time, the routine of FIG. 4 is started. That is,
In the present embodiment, the inside / outside air switch 28, the auto switch 33, and the ignition switch switch 37 constitute the failure diagnosis instructing means according to the invention of claim 1.

Then, in step S10, a subroutine (not shown) is called, and an indicator check is performed here. Specifically, the indicators 35a to 35m shown in FIG. 2 are blinked for a predetermined time (in this embodiment, 8 seconds). At this time, the non-flashing indicator is defective. Then, the routine for checking the indicator is exited.

Then, at the next step S20, a subroutine (not shown) is called, and a sensor check is performed here. Specifically, the sensor group 39 (FIG. 3) is checked for breaks and shorts, and the indicators 35a to 35a corresponding to the broken or shorted sensors are connected.
Flash 35m. For example, when the inside air temperature sensor is disconnected, the indicator 35a is blinked.

Then, in the next step S30, it is determined whether the inside / outside air switch 28 or the off switch 32 is turned on. If the inside / outside air switch 28 is turned on, the process jumps to step S40. If the off switch 32 is turned on, the process jumps to step S50. If neither switch is turned on, the process returns to step S20. .

When the routine jumps to step S50, a subroutine (not shown) is called to carry out normal air conditioning control. Specifically, when the auto switch 33 is turned on by the occupant, based on the set temperature by the temperature setter 34 and each detected value detected by the sensor group 39, each of the air conditioning actuators 7, 9, 40 described above.
Control target values of 42 to 42 are calculated, and the actuators 7, 9, 40 to 42 are controlled based on the control target values.

In step S50, when the switches 26-33 are turned on, the actuators 7, 9, 40- are controlled so as to be in the operated mode.
42 and the heat rays of the rear glass are controlled. Therefore, for example, when the face mode is set by the blow mode switch 30, the servo motor 42 is controlled so that the actual blow mode becomes the face mode. That is, in the present embodiment, the blowout mode control means according to the invention of claim 1 is configured in step S50.

On the other hand, when jumping to step S40, the subroutine shown in FIGS. 5 and 6 is called,
Here, the above-mentioned air conditioning actuators 7, 9, 40-4
Fault diagnosis 2 is performed. That is, in the present embodiment,
The failure diagnosis control means according to the invention of claim 1 is configured in this step S40. And first, step S
At 401, a pattern A is selected from the map shown in FIG. 7 stored in the ROM in advance, and each of the air conditioning actuators 7, 9, 40 to 42 is controlled so as to be the pattern A.

Specifically, the blow mode is the face mode (FACE), the blower level is 0, the inside / outside air mode is the inside air circulation mode (REC), the compressor 11 is off, and the opening degree of the air mix door 18 is -14. The actuators 7, 9, 40 to 42 are controlled so as to be 0% (maximum cooling position). At this time, the display of each indicator is controlled in correspondence with the blowout mode, the blower level, the inside / outside air mode, and the compressor operating state. That is, the indicators 35c and 35g are turned on in association with the face mode and the inside air circulation mode, respectively. Also, in response to the blower level being 0,
All the indicators 35j to 35l are turned off. Also,
The indicator 35i is turned off in response to the compressor 11 being off.

Then, in the next step S402, it is determined whether or not the auto switch 33 or the off switch 32 has been turned on. If the auto switch 33 has been turned on, the process jumps to step S20 in FIG. If 32 is turned on, the process jumps to step S50 in FIG. 4, and if neither switch is turned on, the process proceeds to step S403.

Then, in step S403, it is determined whether or not the blowing mode switch 30 has been turned on. If NO is determined, the process returns to step S401. If YES is determined, step S404 is performed.
7 and select pattern B from the map shown in FIG. 7,
The air conditioning actuators 7, 9, 40 to 42 are controlled so that the pattern B is obtained.

Specifically, the blow mode is the bi-level mode (B / L), the blower level is 1 (low speed), the inside / outside air mode is the inside air circulation mode (REC), the compressor 11 is turned off, and the air mix door 18 is turned off. The actuators 7, 9, 40 to 42 are controlled so that the opening is set to 50.0% (intermediate position). At this time, the display of each indicator is controlled in correspondence with the blowout mode, the blower level, the inside / outside air mode, and the compressor operating state. That is, the indicator 35 is associated with the bi-level mode, the blower level being 1, and the internal air circulation mode, respectively.
d, 35j, and 35g are turned on. Further, the indicator 35i is turned off in response to the turning off of the compressor 11.

Then, in steps S405 and S406, the same processing as in steps S402 and S403 is performed.
In step S407, the pattern C is selected from the map shown in FIG. 7, and the air conditioning actuators 7, 9, 40 to 42 are controlled so that the pattern C is obtained. Specifically, the blow mode is the foot mode (FOOT), the blower level is 13 (medium speed), the inside / outside air mode is the outside air introduction mode (FRS), the compressor 11 is on, and the air mix door 18
So that the opening of 113.5% (maximum heating position)
It controls each actuator 7, 9, 40-42.

At this time, the display of each indicator is controlled according to the blowout mode, the blower level, the inside / outside air mode, and the compressor operating state. That is, the indicators 35e, 35k, 35h, and 35i are turned on in correspondence with the foot mode, the blower level of 13, the outside air introduction mode, and the turning on of the compressor 11, respectively.

Then, in steps S408 and S409, the same processes as those in steps S402 and S403 are performed.
In step S410 of FIG. 6, the pattern D is selected from the map shown in FIG. 7, and the air conditioning actuators 7, 9, 40 to 42 are controlled so that the pattern D is obtained.
Specifically, the blowing mode is the foot differential mode (F /
D), the blower level is 13 (medium speed), the inside / outside air mode is the outside air introduction mode (FRS), the compressor 11 is turned on, and the opening degree of the air mix door 18 is set to 113.5% (maximum heating position). , Control each actuator 7, 9, 40-42.

At this time, the display of each indicator is controlled in accordance with the blowout mode, the blower level, the inside / outside air mode, and the compressor operating state. That is, the indicators 35f, 35k, 35h, and 35i are turned on in correspondence with the foot diff mode, the blower level of 13, the outside air introduction mode, and the turning on of the compressor 11, respectively.

Then, in steps S411 and S412, the same processing as steps S402 and S403 is performed.
In step S413, the pattern E is selected from the map shown in FIG. 7, and the air conditioning actuators 7, 9, 40 to 42 are controlled so that the pattern E is obtained. Specifically, the blowout mode is the defroster mode (DEF), the blower level is 31 (high speed), the inside / outside air mode is the outside air introduction mode (FRS), the compressor 11 is turned on, and the air mix door 1
The actuators 7, 9, 40 to 42 are controlled so that the opening degree of 8 is 113.5% (maximum heating position).
Then, in steps S414 and S415, the same processes as in steps S402 and S403 are performed.

At this time, the display of each indicator is controlled in accordance with the blowout mode, the blower level, the inside / outside air mode, and the compressor operating state. That is, the indicators 35a, 35l, 35h, and 35i are turned on in correspondence with the defroster mode, the blower level of 31, the outside air introduction mode, and the turning on of the compressor 11, respectively.

According to this embodiment described above, the ECU
The ROM in 36 is used for each air conditioning actuator 7, 9, 4
The number of failure diagnosis patterns A to E necessary for performing the failure diagnosis of 0 to 42 (= the number of blowout modes) are stored in association with the blowout mode as shown in FIG. 7. And ECU3
In the failure diagnosis, the blow-out mode switch 30 is sequentially turned on at the time of failure diagnosis, and the pattern corresponding to the operated blow-out mode is displayed in the above five failure diagnosis patterns A.
To E, the air conditioning actuators 7, 9, 40 to 42 are controlled so as to obtain the selected pattern.

As described above, according to the present embodiment, the inspector performs the simple operation of sequentially turning on the blowout mode switch 30 so that each of the air conditioning actuators 7, 9, 40-4.
2. Fault diagnosis can be performed. In addition, since the indicator corresponding to each pattern is lit during the above-mentioned failure diagnosis, the inspector can accurately carry out the failure diagnosis based on the lighting state of the indicator.

(Other Embodiments) In the above embodiment, the face, bi-level, foot, and foot differential modes are set by sequentially repeating the ON operation of the same blowout mode setting switch 30 shown in FIG. Although the configuration is adopted, as shown in FIG. 8, the air conditioning panel 25 may be provided with blowout mode switches 30a to 30d for setting each of the above modes.

In this case, when the switch 30a is turned on at the time of failure diagnosis, the ECU 36 causes the air conditioning actuators 7, 9, 40 to have the pattern A shown in FIG.
It is sufficient to control ~ 42. Hereinafter, similarly, the switch 30
When b is turned on, pattern B, switch 30
When c is turned on, pattern C, switch 30
The air conditioning actuators 7, 9, 40 to 42 may be controlled so that the pattern D is set when the d is turned on and the pattern E is set when the defroster switch 26 is turned on.

In the above embodiment, the failure diagnosis of each of the air conditioning actuators 7, 9, 40 to 42 of the air conditioning unit 1 for air conditioning the front seat side space of the vehicle interior has been described. In the case of providing the air conditioning unit, the air conditioning actuators 7, 9 can be operated by the simple operation of turning on the blowout mode switch as described above.
The failure diagnosis of 40 to 42 can be performed.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an air conditioner according to an embodiment of the present invention.

FIG. 2 is a front view of an air conditioning panel 25 of the above embodiment.

FIG. 3 is a block diagram of a control system of the embodiment.

FIG. 4 is a flowchart showing a failure diagnosis process of the above embodiment.

FIG. 5 is a flowchart showing details of step S40 in FIG.

FIG. 6 is a flowchart showing details of step S40 in FIG.

FIG. 7 is a table showing the contents of failure diagnosis patterns A to E.

FIG. 8 is a front view of an air conditioning panel 25 according to another embodiment of the present invention.

[Explanation of symbols]

7 Blower Motor (Air Conditioning Actuator), 9 Electromagnetic Clutch (Air Conditioning Actuator), 26 Defroster Switch (Blowout Mode Setting Means), 28 Inside / Outside Air Switch (Failure Diagnosis Instructing Means), 30 Blowout Mode Switch (Blowout Mode Setting Means), 33 Auto switch (fault diagnosis instruction means), 37 Ignition switch Switch (fault diagnosis instruction means), 40, 41 Servo motor (air conditioning actuator), 42 Servo motor (air conditioning actuator, blow mode actuator)

Claims (4)

[Claims] 1. A plurality of air conditioning actuators (7, 9, 40 to 42) including a blow mode actuator (42) for switching a blow mode, and blow mode setting means for a passenger in a vehicle compartment to set the blow mode. (26, 3
0) and the blowout mode setting means (2
(6, 30) when the blowout mode is set, a vehicle air conditioner provided with blowout mode control means (S50) for controlling the blowout mode actuator (42) so as to be in the set blowout mode. In the failure diagnosis device, which is used, for failure diagnosis of the plurality of air conditioning actuators (7, 9, 40 to 42) when a diagnosis instruction signal from the failure diagnosis instruction means (28, 33, 37) is input, Multiple air conditioning actuators (7, 9, 40-4
A storage unit (36) storing the failure diagnosis pattern for 2) as different patterns corresponding to each of the blowout modes, and the storage unit (3) when the diagnosis instruction signal is input.
From the plurality of failure diagnosis patterns stored in 6), the failure diagnosis pattern corresponding to the blowout mode set by the blowout mode setting means (26, 30) is selected so that the selected failure diagnosis pattern is obtained. And a failure diagnosis control means (S40) for controlling the plurality of air conditioning actuators (7, 9, 40 to 42). 2. The blowing mode setting means (26, 30)
The fault diagnosis apparatus according to claim 1, wherein is a push-type switch. 3. The failure diagnosis instruction means (28, 33, 3)
7) is the air conditioning actuator (7, 9, 40-4)
The failure diagnosis device according to claim 1 or 2, further comprising an air conditioning mode setting means (28, 33) for an occupant in the passenger compartment to set the mode of 2). 4. The plurality of air conditioning actuators (7,
9, 40 to 42), and a plurality of display means (35a, 35c to 35l) for displaying the operating state, and the failure diagnosis control means (S40) includes the plurality of actuators (S40) so that the selected failure pattern is obtained. 7,
9. 40 to 42) is controlled, the plurality of display means (35a, 35c to 35l) are display-controlled in correspondence with the selected failure pattern. The failure diagnosis device according to item 1.