JP3801516B2 - Vehicle air conditioning system and failure information detection method for vehicle air conditioning system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle air conditioning system having a failure detection function of an air conditioning system, and more specifically, has a function of performing failure detection based on failure information and time lapse information from the time of failure occurrence. The present invention relates to a vehicle air conditioning system.
[0002]
[Prior art]
Conventionally, a vehicle air conditioning system mounted on a vehicle such as a bus performs air conditioning by driving a compressor by a motor, an engine, or the like to cool or heat the room. That is, the high-temperature and high-pressure refrigerant sent from the compressor through the pipe is liquefied by the condenser, and further, the indoor air is cooled by sending the liquefied refrigerant to the evaporator and evaporating it. The air-conditioning process is performed by a circulation cycle in which the vaporized refrigerant is liquefied by a condenser in order to use it again. Although heating is also different from the above-described circulation cycle, various actuators are driven to heat the air and send it to the room. Various types of failure detection sensors are installed in such a vehicle air conditioning system. When these failure detection sensors detect a signal level that exceeds a predetermined threshold, the failure information is transmitted, and the corresponding failure information is displayed on the display panel of the driver's seat. To be displayed. Therefore, if failure information during operation is held on the display panel, failure diagnosis can be easily performed at a repair shop.
[0003]
[Problems to be solved by the invention]
However, there is a transient failure in which the display disappears after the failure information is temporarily displayed on the display panel during operation. Such a transient failure often has difficulty in failure analysis (troubleshooting) because the cause of the failure is unknown because there is little related information dating back to the time of the failure. Therefore, a method of performing failure analysis by acquiring past failure date / time information by a calendar function of a microcomputer mounted on a vehicle control device is also performed. However, since the memory IC of the microcomputer uses a battery as a power source, if the battery is removed at a repair shop, the calendar function disappears and information on past failure dates cannot be obtained. Furthermore, the work of resetting the calendar function once disappeared is quite complicated. In addition, since the past failure date and time information may normally be time information on the order of a date, it is not practical to aggregate time information on the order of seconds or less that the calendar function of the microcomputer has. Further, a microcomputer having such a calendar function is expensive in terms of cost.
[0004]
The present invention has been made in view of the above-described problems. The object of the present invention is to perform failure diagnosis using time-lapse information linked with failure information without using the calendar function of the control device provided in the vehicle. An object of the present invention is to provide a vehicle air conditioning system that can be used.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a vehicle air conditioning system according to the present invention is a vehicle air conditioning system having a failure detection function of an air conditioning system, comprising failure detection means for detecting failure information of the air conditioning system, and failure detection A timing unit that starts counting time lapse information from the time when the unit detects the failure information; a storage unit that stores the failure information detected by the failure detection unit and the time lapse information counted by the timing unit; It is configured so that failure information and time lapse information stored in the The time counting means counts time elapsed information based on operation information of an actuator that drives the air conditioning system. It is characterized by that.
[0006]
That is, according to the vehicle air conditioning system of the present invention, the failure information of the air conditioning system and the time elapsed information counted from the time of occurrence of the failure are paired and stored in the storage means. The failure information and the time lapse information for knowing the date and time of occurrence of the failure information can be acquired. This makes it possible to know the weather conditions and traffic conditions at the time when the failure occurred, so that failure analysis can be performed easily and quickly.
[0007]
Also, According to the vehicle air-conditioning system of the present invention, when a failure occurs in the air-conditioning system, the operation time of the actuator for driving the air-conditioning system, the actuator such as the engine and the compressor, and the number of ON / OFF times are counted to elapse time. It is acquired as information and stored in the storage means together with the failure information. Therefore, since the failure detection mechanism can be realized with simple timing means and existing storage means, the added value can be increased without increasing the cost of the vehicle air conditioning system as compared with the prior art.
[0009]
In the vehicle air conditioning system of the present invention, the failure information is stored in the storage means as a corresponding error code. Further, the failure information and the time lapse information stored in the storage unit are each visually displayed by the display unit. That is, according to the vehicle air conditioning system of the present invention, for example, at the time of vehicle repair / inspection, the error code corresponding to the failure information stored in the storage means and the time elapsed information after the failure, If displayed on the liquid crystal display, the error code and the time-lapse information after the occurrence of the failure can be seen at a glance. At this time, since a correspondence table between the error code and the failure information is prepared in advance, the failure content can be specified from this correspondence table. On the other hand, if the failure occurrence date and time is specified from the time lapse information, failure analysis can be easily performed based on the failure content and the failure occurrence date and time.
[0010]
The vehicle air conditioning system failure information detection method according to the present invention includes a vehicle air conditioning system failure information detecting method having a failure detection function of the air conditioning system, the first step of detecting failure information of the air conditioning system; It is stored through a second step of starting counting of the elapsed time information from the time when the failure information is detected, and a third step of storing the detected failure information and the counted time elapsed information. The failure information and the time lapse information are extracted in correspondence with each other and used as failure analysis information.
[0011]
In the vehicle air conditioning system failure information detecting method according to the present invention, in the second step, the time lapse information is obtained by counting operating information of an actuator that drives the air conditioning system. To do. Alternatively, in the second step, the time lapse information is obtained based on a clock signal generated by an operation of a microcomputer incorporated in a control device mounted on the vehicle.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a failure diagnosis function in a vehicle air conditioning system of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a failure diagnosis function in the vehicle air conditioning system of the present invention. In FIG. 1, the failure diagnosis function of the vehicle air conditioning system includes an air conditioning unit 1 that performs air conditioning (air conditioning), a failure detection sensor 2 that detects a failure of each unit of the air conditioning unit 1, and each actuator that drives the air conditioning unit 1. An actuator operation measuring unit 3 that measures the operating state of the air conditioner, a storage unit 4 that stores failure information of the air conditioning unit 1 and time elapsed information after the failure, and a system abnormality indicator 28 that displays a system abnormality of the air conditioning unit 1 An error code display 29 for displaying an error code corresponding to the abnormality content of the air conditioning unit 1, and an actuator operation history display for displaying the number of ON / OFF operations or the operation time of the actuator after the abnormality of the air conditioning unit 1 is detected 30.
[0013]
Next, the operation of the failure diagnosis function of the vehicle air conditioning system shown in FIG. 1 will be described. FIG. 2 is a flowchart showing a flow of operation of the failure diagnosis function in the vehicle air conditioning system shown in FIG. Therefore, the operation flow of the failure diagnosis function will be described based on this flowchart.
[0014]
The failure diagnosis function in the vehicle air conditioning system of the present invention constantly monitors whether or not the failure detection sensor 2 has a failure in the air conditioning related system such as the compressor pressure and the room temperature of the air conditioning unit 1 (step S1). When a level signal higher (or lower) than the threshold value is detected, it is detected as failure information (in the case of YES at step S1), and this failure information is transmitted to the storage unit 4 and the actuator operation measuring unit 3 (step S2). ). Then, the failure information is stored in the storage unit 4 such as a memory IC (step S3). At this time, the failure detection sensor 2 displays the failure information on the system abnormality indicator 28. However, if the failure detection sensor 2 returns to normal, the failure information of the system abnormality indicator 28 disappears.
[0015]
In addition, since the failure detection sensor 2 transmits failure information to the actuator operation measuring unit 3 when the failure information is detected, the actuator operation measuring unit 3 drives the air conditioning unit 1 when the failure information is detected. The actuator operation count such as the operating time of the motor, the engine, the compressor, etc., and the number of ON / OFF operations is started (step S4). And the count number of actuator operation | movement is memorize | stored in the memory | storage part 4 as time progress information (step S5). Thereby, since the failure information and the time lapse information after the failure are held in the storage unit 4, the failure information and the time lapse information after the failure can be extracted from the storage unit 4 at an arbitrary time point ( Step S6). Accordingly, when performing repair / inspection, the cause of the failure can be known relatively easily by performing failure analysis based on the failure information extracted from the storage unit 4 and the time-lapse information.
[0016]
Specifically, when repairing / inspecting a failure, the failure information held in the storage unit 4 is displayed on the error code display unit 29 as a corresponding error code, and the actuator information held in the storage unit 4 is displayed. The elapsed time information such as the operation time and the number of ON / OFF times is displayed on the actuator operation history display 30. Then, the content of the failure is specified from the error code displayed on the error code display unit 29, and it is determined from the time lapse information displayed on the actuator operation history display 30 whether or not the corresponding failure has occurred. As a result, it is possible to acquire related information such as operation status and weather conditions at the time of occurrence of the corresponding failure, so that the failure information is a transient past failure that is not continuously displayed on the system abnormality indicator 28. However, failure analysis can be performed relatively easily.
[0017]
Next, the overall operation of the vehicle air conditioning system according to the present invention will be described in association with the failure diagnosis function. FIG. 3 is an external view of a control switch panel of the vehicle air conditioning system according to the present invention. This control switch panel is installed in the driver's seat where it is easy to operate. As shown in FIG. 3, the control switch panel includes a set temperature lowering switch 11 and a set temperature raising switch 12 for changing the set temperature of the air conditioning, an inspection switch 13 for switching various inspection modes, and switching of an indoor temperature sensor. A temperature switch 14 to perform, an inside / outside air switch 15 to perform ventilation switching, an operation / stop switch 17 to operate / stop the air conditioner, an air volume switch 18 to switch the air volume supplied to the room, and a dehumidification switch to switch the dehumidification in the room 19, an automatic switch 16 for switching from the manual mode of the air volume switch 18 and the dehumidification switch 19 to automatic operation, and a liquid crystal display 20 that displays the indoor air conditioning state. Of the operation modes by the respective switches, the description of the operation modes directly related to the present invention will be given later.
[0018]
FIG. 4 is a detailed view of the liquid crystal display 20 shown in FIG. As shown in FIG. 4, on the liquid crystal display 20, the air-conditioning state in the bus car is finely displayed by a liquid crystal tube composed of 7 segments. In other words, the liquid crystal display 20 includes an air volume indicator 21 that displays the air volume during cooling / heating, and a numeric display that switches between a set temperature, a room temperature, a compressor pressure, an air conditioning integrated time, and the like with a 7-segment liquid crystal tube. 22, a unit display unit 23 indicating the unit of numbers displayed on the number display 22, a bus display unit 24 schematically showing the shape of the bus, and a wind direction of each part in the bus car is displayed by a 4-segment liquid crystal tube. A large number of wind direction indicators 25, a compressor operation indicator 26 for displaying the operation state of the compressor for the vehicle air conditioning system, an air conditioning system automatic operation indicator 27 for displaying the automatic operation state of the vehicle air conditioning system, and the vehicle The system abnormality indicator 28 for displaying the system abnormality of the air conditioning system for the vehicle and the error code corresponding to the abnormality content of the vehicle air conditioning system are displayed. A keycode display 29, and an actuator operation history display 30 an abnormality of the vehicle air-conditioning system displays the ON / OFF times or running time of the actuator after being detected.
[0019]
FIG. 5 is a step display diagram that is displayed by the air volume indicator 21 shown in FIG. 4 in accordance with the air volume. (A) shows a stage display during cooling, and (b) shows a stage display during heating. As shown in FIG. 5, the air volume indicator 21 performs four-stage display of Lo, ML, MH, and Hi according to the air volume during cooling, and performs three-stage display of Lo, Me, and Hi according to the air volume during heating. .
[0020]
Returning to FIG. 4, the number display 22 switches and displays numbers such as the set temperature of cooling / heating, the room temperature, the discharge pressure of the refrigerant discharged from the compressor, and the air-conditioning integration time by a seven-segment liquid crystal tube. . At this time, “° C.”, “H”, “kg / cm” of the unit display unit 23 as the unit of the number displayed on the number display 22 according to the display content. ² "Etc. are automatically switched.
[0021]
In each part of the bus car indicated by the bus display unit 24, the air direction of the air to be conditioned is displayed by a 4-segment liquid crystal tube of a number of wind direction indicators 25. For example, ventilate room air to the outside from the front part of the bus (left side of the figure) or the rear part, send cool air downward from the front or rear part of the ceiling with a cooling fan, or from the ceiling part near the center. When the evaporator fan sends cool air downward, sends warm air from the floor to the ceiling of the bus, circulates indoor air when the outside air introduction damper is closed, or the air introduction damper is open A state in which outside air is introduced into the room from the floor is displayed by a 4-segment liquid crystal tube. At this time, the compressor operation indicator 26 is lit. Further, when the vehicle air conditioning system is in the automatic operation mode, the air conditioning system automatic operation indicator 27 is lit.
[0022]
When the vehicle air-conditioning system fails, a failure detection sensor provided in each part of the system detects the corresponding failure portion, and the system abnormality indicator 28 is turned on. Further, an error code associated with each failure location or failure content is displayed on the error code display 29. For example, the error code is “001” if the compressor pressure is abnormal, the error code is “010” if the ventilation is abnormal from the ceiling, and the error code is “100” if the motor is abnormal. The error code corresponding to is displayed on the error code display 29.
[0023]
In a normal case, the driver can confirm whether the vehicle air conditioning system is operating normally or whether an abnormality has occurred, depending on whether the system abnormality indicator 28 is displayed. However, even if the vehicle air conditioning system is temporarily in an abnormal state, the system abnormality indicator 28 is extinguished if it returns to normal naturally, so the vehicle air conditioning system is considered to be in the normal state and remains as it is. You may continue driving. In such a case, even if an attempt is made to analyze the contents of a past abnormal state at a later date, it is not easy to perform a failure analysis because there is little information about the failure.
[0024]
Therefore, in the vehicle air conditioning system of the present invention, when a failure occurs in each part of the system, the corresponding failure detection sensor detects the failure portion and lights up the system abnormality indicator 28, and the failure location or the failure content. The error code associated with each is displayed on the error code display 29. At this time, since the display content of the error code is failure information held by the memory IC, the display state of the error code is held in the error code display 29. That is, when the vehicle air-conditioning system returns to the normal state from the failure state, the system abnormality indicator 28 is turned off, but the error code indicator 29 acquires the error code stored in the memory IC and continues to display it. . Note that the display of the error code as described above even after returning to the normal state is referred to as latch display.
[0025]
Furthermore, using the failure information when the failure detection sensor 2 (see FIG. 1) detects the failure portion as a trigger signal, the actuator operation measuring unit 3 (see FIG. 1) which is a time measuring means is an actuator of the vehicle air conditioning system. Starts counting of operation time and ON / OFF frequency of motor, engine, compressor, etc. Then, the operating time of the actuator after the failure detection sensor 2 detects the failure information or the count value of the number of ON / OFF times is stored in the memory IC of the storage unit 4 as time lapse information, and this time lapse information is stored as necessary. It is transferred to the actuator operation history display 30 and displayed. The transfer display from the memory IC of the storage unit 4 to the actuator operation history display 30 may be displayed as desired by operating a predetermined switch.
[0026]
As an example of operation in a specific failure mode, when the failure detection sensor detects a compressor pressure abnormality, the system abnormality indicator 28 is turned on, and the compressor is abnormal in the memory IC mounted on the control device. The failure information to the effect is stored. Furthermore, the failure detection sensor sends a memory start trigger signal to the memory IC, and measures the compressor operation time or the number of ON / OFF times from the time when the timing means (actuator operation measuring unit 3) receives the trigger signal. Then, this is stored in the memory IC as time lapse information related to the failure information.
[0027]
When a predetermined switch is operated every predetermined period, for example, at the end of a day's operation or when the vehicle is brought to a repair shop for repair inspection, an abnormal pressure of the compressor stored in the memory IC The error code “001” corresponding to is transferred to the error code display 29 and latched. Further, the elapsed time information based on the compressor operation time or the number of ON / OFF times stored in the memory IC is transferred to the actuator operation history display 30 and latched.
[0028]
At this time, when the compressor pressure abnormality phenomenon disappears during operation and the normal state is restored, the system abnormality indicator 28 is turned off and the display content of the liquid crystal display 20 becomes a normal state. However, an error code “001” indicating that there has been a compressor pressure abnormality in the past is latched and displayed on the error code display 29. Further, the operation time of the compressor or the number of ON / OFF times after the time when the compressor pressure abnormality occurs is latched and displayed on the actuator operation history display 30 as time elapsed information after the occurrence of the failure.
[0029]
Therefore, when the vehicle is brought to the repair shop, the error code displayed on the error code display 29 and the compressor operation time or the number of ON / OFF times after the occurrence of the failure displayed on the actuator operation history display 30 are displayed. From this, it is possible to know when the compressor pressure abnormality has occurred. In other words, since the operation time of the compressor or the number of ON / OFF operations per day is a known value from the past operation record of the bus, it is approximately what the operation time or the number of ON / OFF times displayed on the actuator operation history display 30. It is possible to know whether a compressor pressure abnormality occurred a day ago. Further, it is possible to specify that the failure content is a compressor pressure abnormality by the error code number.
[0030]
In this way, even if a temporary failure is detected by the failure detection sensor, the failure information latched and displayed on the error code display 29 and the time after the occurrence of the failure latched and displayed on the actuator operation history display 30 are displayed. From the time lapse information, it is possible to know when the failure displayed on the error code display 29 has occurred at about the time. As a result, it is possible to acquire related information such as operation status and weather conditions at the time when the failure occurs, so that failure analysis can be performed relatively easily from the causal relationship between the failure content and the related information. For example, if you know that the time when the compressor pressure abnormality occurred was a hot day or a traffic jam time zone from the time lapse information, the compressor was temporarily overloaded because the cooling did not work. It can be determined that the failure is a transient failure in which a pressure abnormality has occurred and is not a failure requiring repair.
[0031]
On the other hand, if it is found from the time lapse information that the date and time when the compressor pressure abnormality occurred was a climatically calm day and no traffic congestion, it was a temporary compressor pressure abnormality. Therefore, even if it is a temporary failure, it can be determined that the failure requires repair. In this way, even if the failure state is a temporary past failure that is not continuously displayed on the system abnormality indicator 28, the failure analysis is performed relatively easily based on the time-lapse information after the failure has occurred. be able to.
[0032]
FIG. 6 shows the inspection mode display contents displayed on the liquid crystal display when various switches of the control switch panel shown in FIG. 3 are operated. First, when entering the inspection mode as shown in FIG. 6, the automatic switch 16 and the inspection switch 13 are simultaneously pressed for 3 seconds or more. When the inspection mode is ended, the operation / stop switch 17 is pushed. Next, when the inspection mode is entered, every time the inspection switch 13 or the temperature switch 14 is pressed once, the display contents are switched and displayed in the order shown in FIG. When the automatic switch 16 is pressed during display, the set temperature is displayed.
[0033]
When the inspection switch 13 is pressed to switch to the error code item, for example, when the error code is displayed as “001” on the error code display 29, “compressor pressure abnormality” is indicated. When other error codes are displayed, the corresponding failure contents are prepared as correspondence tables, but the correspondence table is omitted. When nothing is displayed on the error code display 29, it is normal. Similarly, when the check switch 13 is sequentially pressed, the compressor operating time, the condenser motor integrated time, the evaporator fan motor integrated time, the preheater integrated time, and the water pump integrated time are displayed on the numeric display 22 in four-digit decimal. The unit display section 23 is switched to “H” and displayed. Further, by pressing the check switch 13, it is possible to display the compressor operation time when the latest error occurs. In addition, by pressing the inspection switch 13 and the automatic switch 16 at the same time, the heating set temperature and the cooling set temperature can be displayed on the numeric display 22 in two-digit decimal. At this time, the unit display unit 23 is automatically switched to “° C.”.
[0034]
Further, by sequentially pressing the temperature switch 14, the current temperature of each part of the interior of the bus can be displayed on the numeric display 22 in two-digit decimal. At this time, the unit display unit 23 is automatically switched to “° C.”. When the temperature switch 14 is further pressed, a past error indicating that there has been a temperature abnormality in the past is displayed, for example, “E41”. In this mode, the inspection switch 13 and the temperature switch 14 are simultaneously turned on for 3 seconds. If the key is continuously pressed, the buzzer sounds and the past error “E41” is cleared.
[0035]
The embodiment described above is an example for explaining the present invention, and the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist of the invention. In the above embodiment, the operation information of the actuator that drives the vehicle air conditioning system is measured and used as time lapse information after the failure. However, the present invention is not limited to this, and the clock function of the microcomputer included in the control device is not limited to this. It can also be used as time lapse information. That is, if the microcomputer clock function is configured to start counting when a failure occurs, time-lapse information after the failure can be extracted from the clock integrated value of the microcomputer as described above. In the above embodiment, an example of a bus air conditioner has been described. However, the present invention is not limited to this, and the same effects as the above embodiment can be applied to other air conditioning systems such as vehicles and trains. Needless to say, is obtained.
[0036]
【The invention's effect】
As described above, according to the failure detection function in the vehicle air conditioning system of the present invention, the failure information of the air conditioning system and the time elapsed information counted from the time when the failure occurred are paired and stored in the storage means. Therefore, even if the failure is transient, the failure information and the time lapse information for knowing the date and time of occurrence of the failure can be acquired. Therefore, since the weather condition and traffic condition at the time of the failure can be known, the failure analysis can be performed easily and quickly. For example, even if a compressor pressure abnormality occurs transiently and returns to normal naturally, the failure information and time lapse information are stored. You can know what happened. If the compressor pressure abnormality occurs on a hot day or a time of traffic jam, it can be determined that the compressor pressure abnormality is transient and no repair is necessary.
[0037]
In addition, according to the vehicle air conditioning system of the present invention, when a failure occurs in the air conditioning system, the operation time and the number of ON / OFF times of actuators such as motors, engines and compressors for driving the air conditioning system are counted. Obtained as time-lapse information and stored together with failure information. Therefore, since the failure detection mechanism can be realized with simple timing means and existing storage means, the added value of the failure detection mechanism can be increased without substantially increasing the cost of the vehicle air conditioning system as compared with the conventional case. .
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a failure diagnosis function in a vehicle air conditioning system of the present invention.
FIG. 2 is a flowchart showing a flow of operation of a failure diagnosis function in the vehicle air conditioning system shown in FIG. 1;
FIG. 3 is an external view of a control switch panel of the vehicle air conditioning system according to the present invention.
4 is a detailed view of the liquid crystal display 20 shown in FIG.
5A and 5B are step display diagrams that are displayed by the air volume indicator 21 shown in FIG. 4 according to the air volume. FIG. 5A shows a stage display during cooling, and FIG. 5B shows a stage display during heating.
FIG. 6 shows the inspection mode display contents displayed on the liquid crystal display when various switches of the control switch panel shown in FIG. 3 are operated.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Air-conditioning part, 2 ... Failure detection sensor, 3 ... Actuator operation measurement part, 4 ... Memory | storage part, 11 ... Setting temperature reduction switch, 12 ... Setting temperature raising switch, 13 ... Inspection switch, 14 ... Temperature switch, 15 ... Inside / outside 16 ... automatic switch, 17 ... run / stop switch, 18 ... air flow switch, 19 ... dehumidification switch, 20 ... liquid crystal display, 21 ... air flow indicator, 22 ... numeric display, 23 ... unit display, 24 DESCRIPTION OF SYMBOLS ... Bus display part 25 ... Wind direction indicator 26 ... Compressor operation indicator 27 ... Air-conditioning system automatic operation indicator 28 ... System abnormality indicator 29 ... Error code indicator 30 ... Actuator operation history indicator,

Claims (6)

A vehicle air conditioning system having a failure detection function of an air conditioning system,
Failure detection means for detecting failure information of the air conditioning system;
Time counting means for starting counting of elapsed time information from the time when the failure detection means detects the failure information;
Storage means for storing failure information detected by the failure detection means and time lapse information counted by the timing means;
The failure information stored in the storage means and time lapse information are configured to be extracted in correspondence with each other ,
The timekeeping means counts time lapse information based on operating information of an actuator that drives the air conditioning system. The vehicle air conditioning system according to claim 1, wherein the failure information is stored in the storage unit as a corresponding error code . The vehicle air conditioning system according to claim 1 or 2, wherein the failure information and the time lapse information stored in the storage means are each visually displayed by a display means . In a failure information detection method for a vehicle air conditioning system equipped with an air conditioning system failure detection function,
  A first step of detecting failure information of the air conditioning system;
  A second step of starting counting time lapse information from the time when the failure information is detected;
  Through the third step of storing the detected failure information and the counted time passage information,
  A failure information detection method for a vehicle air-conditioning system, wherein stored failure information and time lapse information are extracted in correspondence with each other and used as failure analysis information. 5. The vehicle air conditioning system failure according to claim 4, wherein in the second step, the time lapse information is obtained by counting operation information of an actuator that drives the air conditioning system. Information detection method. 5. The time-lapse information in the second step is obtained based on a clock signal generated by an operation of a microcomputer incorporated in a control device mounted on a vehicle. The failure information detection method of the vehicle air conditioning system as described in 2 .

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