Recording device for railway vehicle and air conditioner for railway vehicle

Abstract

To provide a recording device for a railway vehicle and an air conditioner for a railway vehicle capable of confirming behavior indicated to an external event by an air conditioner even when no abnormality occurs in the air conditioner.SOLUTION: A writing unit 432 sequentially overwrites tracking data DC including control command data DB and detection data DA to a work area of a tracking memory 440 in a recording device for a railroad vehicle. A designation receiving unit 434 accepts designation of an external event occurence condition which is a condition expressing an occurrence of an external event capable of influencing an action of an air conditioner 300. A determination unit 433 determines whether or not the external event occurrence condition is established by monitoring an environment physical quantity or a position of a travelling railroad vehicle. The writing unit 432 stops overwriting of the tracking data DC to the work area when determined that the external event occurrence condition is established by the determination unit 433.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a recording device for a railway vehicle and an air conditioning device for a railway vehicle. [Background technology]

[0002] A railway vehicle recording device equipped with a volatile tracking memory is known, as disclosed in Patent Document 1. This railway vehicle recording device has a writing unit that sequentially overwrites the tracking memory with operational data representing the time series of the operation of the air conditioning equipment, and a detection unit that detects the occurrence of an abnormality in the air conditioning equipment.

[0003] The writing unit stops overwriting the operational data in the tracing memory when the detection unit detects the occurrence of an abnormality. Therefore, when an abnormality occurs, the process leading to the abnormality can be traced by checking the operational data remaining in the tracing memory.

[0004] The occurrence of an abnormality in the air conditioning equipment is defined as a physical quantity included in the operation data exceeding a predetermined threshold value. That is, the detection unit detects that the physical quantity included in the operation data has exceeded the threshold value.

[0005] Patent Document 1 also discloses a configuration in which the operation data remaining in the tracking memory after overwriting is stopped is transmitted to an external information collection device. The information collection device is installed in the onboard distribution panel of the railway vehicle. This allows maintenance personnel to easily access the information collection device to retrieve the operation data remaining in the tracking memory. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2019 / 082401 Summary of the Invention [Problem to be solved by the invention]

[0007] In the above configuration, if no abnormality is detected in the air conditioner, i.e., if the physical quantity included in the operational data does not exceed the threshold, the overwriting is not stopped as described above. Therefore, no operational data remains in the tracking memory. In other words, if the air conditioner does not become abnormal, the operation of the air conditioner cannot be tracked.

[0008] However, there are cases where you want to track the behavior of air conditioners even if they do not malfunction. Specifically, when a specific event (hereinafter referred to as an external event) occurs that causes a change in the load on the operation of the air conditioners, you may want to check later whether the air conditioners behaved appropriately in response to that external event.

[0009] The object of the present disclosure is to provide a recording device for railway vehicles and an air conditioning device for railway vehicles that can check the behavior of the air conditioning device in response to external events even when there is no abnormality in the air conditioning device. [Means for solving the problem]

[0010] The railway vehicle recording device according to the present disclosure comprises: a detection unit that repeatedly detects, from an air conditioning device that conditions the air of a passenger compartment of a railway vehicle, an operational physical quantity that represents an operation of the air conditioning device at a predetermined sampling frequency, and generates detection data that represents a time series of detected values ​​of the operational physical quantity; a control unit that controls the air conditioning equipment using the detection data; a tracking memory into which tracking data including control command data representing a time series of control commands generated by the control unit to control the air conditioning equipment and the detection data is written, the tracking memory being volatile and having a work area into which the tracking data for a predetermined tracking period can be written; a specification receiving unit that receives a specification of an external event occurrence condition, which is a condition that indicates the occurrence of an external event that may affect the operation of the air conditioning equipment and whose occurrence is defined in relation to an environmental physical quantity that indicates the environment of the passenger compartment or a position of the railway vehicle while it is running; a determination unit that determines whether the external event occurrence condition is met by monitoring the environmental physical quantity or the position of the railway vehicle while it is running; a writing unit that sequentially overwrites the tracing data in the work area to sequentially update the contents recorded in the work area with the tracing data for the latest tracing period, and stops overwriting the tracing data in the work area when the determining unit determines that the external event occurrence condition is met; Equipped with. [Effects of the Invention]

[0011] According to the above configuration, when an external event occurs, the overwriting of the detection data and control command data in the work area is stopped. Therefore, even if no abnormality occurs in the air conditioning equipment, the behavior of the air conditioning equipment in response to the external event can be confirmed through the detection data and control command data remaining in the work area. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a conceptual diagram showing the configuration of a railway vehicle air conditioning device according to a first embodiment; [Figure 2] 1 is a conceptual diagram showing the configuration of a refrigeration cycle device according to a first embodiment. [Figure 3] 1 is a conceptual diagram showing the configuration of a power supply circuit according to a first embodiment; [Figure 4] 1 is a conceptual diagram showing the main parts of a control unit according to the first embodiment; [Figure 5] Flowchart of sequential update processing according to the first embodiment [Figure 6] 1 is a conceptual diagram showing a waveform of data recorded in a tracking memory according to the first embodiment; [Figure 7] Flowchart of sequential update processing according to the second embodiment [Figure 8] 10 is a conceptual diagram showing the configuration of a railway vehicle air conditioning device according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a railway vehicle air conditioner mounted on a railway vehicle will be described below with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals.

[0014] [Embodiment 1] 1, a railway vehicle air conditioning system 600 according to this embodiment includes air conditioning equipment 300 that conditions the interior of a railway vehicle, and a control device 400 that controls the air conditioning equipment 300. By controlling the air conditioning equipment 300 with the control device 400, the capacity of the air conditioning equipment 300 to air condition the interior of the vehicle can be adjusted.

[0015] In this specification, the term "cabin" refers to a space defined in a railway vehicle to accommodate people, and includes a space where seats are arranged, a space used as an aisle, etc. The cabin includes a "passenger compartment" defined to accommodate passengers.

[0016] The air conditioning equipment 300 includes a power supply circuit 100 electrically connected to the overhead line, and a refrigeration cycle device 200 that receives power through the power supply circuit 100. The refrigeration cycle device 200 conditions the vehicle interior by forming a refrigeration cycle using a refrigerant.

[0017] The following will specifically describe the configuration of each part of the railway vehicle air conditioning system 600. First, the configuration of the refrigeration cycle device 200 will be described with reference to FIG.

[0018] As shown in FIG. 2, the refrigeration cycle device 200 is configured as a two-system refrigeration cycle device, that is, a first refrigeration cycle device 200a and a second refrigeration cycle device 200b.

[0019] The first refrigeration cycle device 200a has a first compressor 211 that compresses the refrigerant, an outdoor heat exchanger 220 that functions as a condenser that condenses the compressed refrigerant, a first expander 231 that expands the condensed refrigerant, an indoor heat exchanger 240 that functions as an evaporator that evaporates the expanded refrigerant, and a first gas-liquid separator 251 that separates the gaseous refrigerant from the liquid refrigerant and passes only the gaseous refrigerant to the first compressor 211.

[0020] The second refrigeration cycle device 200b shares the outdoor heat exchanger 220 and the indoor heat exchanger 240 with the first refrigeration cycle device 200a. The second refrigeration cycle device 200b has a second compressor 212 that compresses the refrigerant, a second expander 232 that expands the refrigerant condensed in the outdoor heat exchanger 220, and a second gas-liquid separator 252 that separates the liquid refrigerant from the refrigerant that has passed through the indoor heat exchanger 240 and passes only the gaseous refrigerant to the second compressor 212.

[0021] Each of the first compressor 211 and the second compressor 212 described above has a scroll mechanism including a synchronous motor and an airtight container (not shown) that houses the scroll mechanism. The airtight container defines a suction port that draws in a refrigerant, a compression chamber for compressing the refrigerant drawn in from the suction port, and a discharge port that discharges the refrigerant compressed in the compression chamber. When the scroll mechanism is rotated by the synchronous motor, it draws in the refrigerant from the suction port, compresses the drawn refrigerant in the compression chamber, and discharges the compressed refrigerant from the discharge port.

[0022] The synchronous motors provided in each of the first compressor 211 and the second compressor 212 will be described with reference to Fig. 4. As shown in Fig. 4, the synchronous motor 213 has a rotating rotor 214, a stator 215 surrounding the rotor 214, and three-phase coils 216 wound around the stator 215.

[0023] Specifically, the coils 216 include three coils: a U-phase coil, a V-phase coil, and a W-phase coil, and form a magnetic field that rotates the rotor 214. Specifically, the synchronous motor 213 is a three-phase AC permanent magnet synchronous machine.

[0024] Returning to the explanation of Figure 2, the refrigeration cycle device 200 includes, in addition to the first refrigeration cycle device 200a including the first compressor 211 described above and the second refrigeration cycle device 200b including the second compressor 212 described above, an outdoor fan 260 that discharges air that has exchanged heat with the outdoor heat exchanger 220 to the outside of the railway vehicle, and an indoor fan 270 that sends air that has exchanged heat with the indoor heat exchanger 240 into the passenger compartment of the railway vehicle.

[0025] The power supply circuit 100 described above supplies power to the synchronous motor 213 of the first compressor 211, the synchronous motor 213 of the second compressor 212, the outdoor fan 260, and the indoor fan 270. Hereinafter, with reference to Fig. 3, the configuration of the portion from the overhead line to the power supply circuit 100 and the configuration of the power supply circuit 100 will be specifically described.

[0026] 3, a voltage is input to the power supply circuit 100 from an overhead wire WR via a pantograph PG and a transformer TR. The pantograph PG is in contact with the overhead wire WR. The transformer TR transforms the AC voltage supplied from the overhead wire WR through the pantograph PG.

[0027] The power supply circuit 100 includes a rectifier 110 that converts the AC voltage transformed by the transformer TR into a DC voltage, an input capacitor 120 that smoothes the DC voltage output from the rectifier 110, a chopper circuit 130 that adjusts the effective value of the smoothed DC voltage by chopper control, and an output capacitor 140 that holds the output voltage of the chopper circuit 130.

[0028] The power supply circuit 100 also has three inverter circuits 151-153 that convert the output voltage of the chopper circuit 130 into AC voltage. These inverter circuits 151-153 are connected in parallel to each other, and the frequency of each output voltage can be controlled independently.

[0029] The output voltage of the inverter circuit 151 is supplied to the outdoor fan 260. The output voltage of the inverter circuit 152 is supplied to the first compressor 211. The output voltage of the inverter circuit 153 is supplied to the second compressor 212.

[0030] The power supply circuit 100 also has a contactor 160 arranged on a power transmission path that supplies the AC voltage transformed by the transformer TR to the indoor fan 270. The AC voltage transformed by the transformer TR is supplied to the indoor fan 270 as is without passing through the rectifier 110.

[0031] In addition, the power supply circuit 100 has, between the transformer TR and the rectifier 110, a contactor 171 that turns on / off the connection between the transformer TR and the rectifier 110, a current-limiting resistor 172 that suppresses inrush current when the input capacitor 120 is charged, a contactor 173 that bypasses the current-limiting resistor 172 after the input capacitor 120 is charged, and an AC reactor 174 that suppresses surges.

[0032] The power supply circuit 100 described above is controlled by the control device 400 shown in Fig. 1. The control device 400 will be described below.

[0033] 1, the control device 400 includes a detection unit 410. The detection unit 410 detects the voltage and current inside the power supply circuit 100 as physical quantities of operation that represent the operation of the air conditioning equipment 300.

[0034] Specifically, as shown in Figure 3, the detection unit 410 has a detection transformer 411 that transforms the input voltage to the chopper circuit 130, a detection transformer 412 that transforms the output voltage from the chopper circuit 130, a detection transformer 413 that transforms the output current from the chopper circuit 130, a detection transformer 414 that transforms the output current from the inverter circuit 151, a detection transformer 415 that transforms the output current from the inverter circuit 152, and a detection transformer 416 that transforms the output current from the inverter circuit 153.

[0035] The detection unit 410 shown in FIG. 1 repeatedly detects the outputs of each of the detection transformers 411 to 416 at a predetermined sampling frequency, and outputs detection data DA consisting of time series data representing the time series of each detection value.

[0036] In other words, the detection data DA includes time series data of the input voltage of the chopper circuit 130, time series data of the output voltage of the chopper circuit 130, time series data of the output current of the inverter circuit 151, time series data of the output current of the inverter circuit 152, and time series data of the output current of the inverter circuit 153.

[0037] 1, the control device 400 includes a control unit 431 that controls the air conditioning equipment 300. The control unit 431 controls the power supply circuit 100 using the detection data DA output by the detection unit 410.

[0038] Specifically, the control unit 431 performs feedback control to bring the output voltage of the chopper circuit 130 shown in Fig. 3 closer to a target value, and feedback control to bring the effective value and frequency of the output of each of the inverter circuits 151-153 closer to their target values. The control unit 431 also controls the contactors 160, 171, and 173 shown in Fig. 3.

[0039] The control unit 431 generates a plurality of types of control commands CS to control the air conditioner 300. Some of the control commands CS are output to the power supply circuit 100.

[0040] The control command CS output to the power supply circuit 100 includes a gate voltage signal that controls the ON / OFF of the switching elements that make up the chopper circuit 130 shown in FIG. 3, a gate voltage signal that controls the ON / OFF of the switching elements that make up each of the inverter circuits 151-153, and a voltage signal that controls the ON / OFF of each of the contactors 160, 171, and 173.

[0041] The control unit 431 also performs sensorless vector control of the synchronous motors 213 shown in FIG. 4 that are provided in each of the first compressor 211 and the second compressor 212 shown in FIG. 2, using the detection data DA.

[0042] 4, the configuration of the main parts that perform the sensorless vector control in control unit 431 will be specifically described below. Note that sensorless vector control refers to control that estimates the rotational speed of rotor 214 from the current supplied to coil 216 without detecting the position of rotor 214 in the rotational direction, and brings the estimated rotational speed closer to speed command value w*.

[0043] The coordinate system used to control the synchronous motor 213 will be defined below. In the following description, the "d-axis" refers to an imaginary axis that extends in the direction of the magnetic flux created by the magnetic poles of the rotor 214. The "q-axis" refers to an imaginary axis that extends in a direction perpendicular to the d-axis. The dq coordinate system consisting of the d-axis and q-axis is fixed with respect to the rotor 214 and rotates together with the rotor 214.

[0044] The control unit 431 has a speed command value output unit 431a that outputs a speed command value w* that is a command value for the rotation speed of the rotor 214. The speed command value output unit 431a outputs the speed command value w* that represents the air conditioning capacity that should currently be exerted by the air conditioning equipment 300 shown in Fig. 2. Specifically, the speed command value output unit 431a outputs the speed command value w* that is a value that corresponds to the difference between the temperature and the target temperature in the vehicle cabin, the difference between the humidity in the vehicle cabin and the target humidity, the outside air temperature, the occupancy rate of passengers in the vehicle cabin, etc.

[0045] The control unit 431 also has a current command value generation unit 431b that generates a d current command value id* that is a d-axis component and a q current command value iq* that is a q-axis component of the command value of the current to be supplied to the coil 216. The current command value generation unit 431b generates the d current command value id* and the q current command value iq* that correspond to the speed command value w* output by the speed command value output unit 431a.

[0046] The control unit 431 also has a current control unit 431c that generates a d-voltage command value vd* that is a d-axis component and a q-axis component of the command value of the voltage to be supplied to the coil 216. The current control unit 431c generates the d-voltage command value vd* and the q-voltage command value vq* based on the d-current command value id* and the q-current command value iq* generated by the current command value generation unit 431b.

[0047] The control unit 431 also has a voltage control unit 431d that outputs the above-mentioned gate voltage signal to the inverter circuit 152. The voltage control unit 431d uses the gate voltage signal to PWM-control the inverter circuit 152. As a result, three-phase AC voltages that have been PWM-modulated according to the d-voltage command value vd* and the q-voltage command value vq* are applied by the inverter circuit 152 to the U-phase coil 216, the V-phase coil 216, and the W-phase coil 216.

[0048] The control unit 431 also has a calculation unit 431e to which the gate voltage signal output from the voltage control unit 431d to the inverter circuit 152, the current values ​​iU and iV detected by the detection transformer 415, etc. are input. The current value iU is the value of the current supplied to the U-phase coil 216, and the current value iV is the value of the current supplied to the V-phase coil 216.

[0049] Using the gate voltage signal, current values ​​iU and iV, etc., the calculation unit 431e calculates an estimated phase θ, which is an estimated value of the angle in the rotation direction of the rotor 214, a speed specification value w, which is an estimated value of the rotation speed of the rotor 214, a d current supply value id, which is the component of the current supplied to the coil 216 in the d-axis direction, and a q current supply value iq, which is the component of the current supplied to the coil 216 in the q-axis direction.

[0050] The speed specification value w is used in the current command value generation unit 431b to calculate a d current command value id* and a q current command value iq*. The d current supply value id and the q current supply value iq are used in the current control unit 431c to calculate a d voltage command value vd* and a q voltage command value vq*. The estimated phase θ is used in the voltage control unit 431d to generate a gate voltage signal.

[0051] The above has described a configuration in which the inverter circuit 152 that supplies power to the synchronous motor 213 of the first compressor 211 shown in Fig. 3 is controlled by the control unit 431. The inverter circuit 153 that supplies power to the synchronous motor 213 of the second compressor 212 shown in Fig. 3 is similarly controlled by the control unit 431. The above has described a configuration of the main parts that perform sensorless vector control in the control unit 431.

[0052] Returning to the explanation of Fig. 1, the control commands CS generated by the control unit 431 include not only those output to the air conditioning equipment 300 but also those used within the control unit 431 to control the air conditioning equipment 300, in particular, to perform the sensorless vector control of the synchronous motor 213 described above.

[0053] Specifically, the control commands CS used within the control unit 431 include the speed command value w*, d current command value id*, q current command value iq*, d voltage command value vd*, q voltage command value vq*, estimated phase θ, speed specification value w, d current supply value id, and q current supply value iq, as already mentioned.

[0054] Note that both the control command CS output to the air conditioning equipment 300 and the control command CS used inside the control unit 431 represent the control operation of the control unit 431.

[0055] The control device 400 also functions as a railway vehicle recording device that records the operations of the air conditioning equipment 300 and the control unit 431 to enable tracking of the operations of the air conditioning equipment 300 and the control unit 431. The configuration of the control device 400 as a railway vehicle recording device will be described below.

[0056] The control device 400 includes a volatile tracking memory 440. The tracking memory 440 stores control command data DB representing the time series of the control commands CS described above and detection data DA output by the detection unit 410.

[0057] The detection data DA and the control command data DB constitute tracing data DC for tracing the operations of the air conditioning equipment 300 and the control device 400. The tracing memory 440 has a work area in which tracing data DC for a predetermined tracing period can be written.

[0058] The control device 400 also includes a writing unit 432 that writes the trace data DC into the work area of ​​the trace memory 440 .

[0059] The writing unit 432 performs a sequential update process in which, while the air conditioning equipment 300 is operating, each piece of time-series data constituting the tracing data DC is sequentially overwritten in the work area of ​​the tracing memory 440. As a result, while the air conditioning equipment 300 is operating, the contents recorded in the work area of ​​the tracing memory 440 are sequentially updated to the tracing data DC for the latest tracing period.

[0060] However, when the writing unit 432 stops overwriting the trace data DC in the work area of ​​the trace memory 440, the trace data DC remains in that work area.

[0061] In this case, by analyzing the tracing data DC left in the work area, it is possible to trace the operations of the air conditioning equipment 300 and the control device 400 up to the point when the writing unit 432 stopped overwriting. In other words, the tracing data DC left in the work area is used to trace the operations of the air conditioning equipment 300 and the control device 400.

[0062] In this embodiment, one objective is to realize a configuration that can later track whether the air conditioning equipment 300 and the control device 400 have exhibited appropriate behavior in response to a specific external event that causes a change in the load on the operation of the air conditioning equipment 300.

[0063] Such a configuration is realized when an external event occurs by the writing unit 432 stopping overwriting of the tracing data DC to the work area of ​​the tracing memory 440. To achieve this, not only a configuration for detecting the occurrence of an external event but also a configuration for defining what kind of event is considered an external event is required.

[0064] Therefore, the control device 400 includes a specification receiving unit 434 that receives, from the user, a specification of an external event occurrence condition, which is a condition that indicates the occurrence of an external event that may affect the operation of the air conditioning equipment 300. The occurrence of an external event is defined in relation to an environmental physical quantity that indicates the environment in the passenger compartment of the railcar or the position of the railcar while it is running.

[0065] Specifically, the occurrence of an external event is defined as at least one of the following (a)-(i): In other words, the following (a)-(i) are the specific contents of the external event occurrence conditions.

[0066] (a) The rate of change of the temperature in the vehicle cabin exceeds a predetermined threshold value for the rate of change (hereinafter referred to as the temperature change rate threshold). If this is set as the external event occurrence condition, the specification receiving unit 434 receives a specification of the temperature change rate threshold value from the user. The rate of change of the temperature in the vehicle cabin is an example of an environmental physical quantity.

[0067] (b) The rate of change in humidity in the vehicle cabin exceeds a predetermined threshold value for the rate of change (hereinafter referred to as the humidity change rate threshold value). If this is set as the external event occurrence condition, the specification receiving unit 434 receives a specification of the humidity change rate threshold value from the user. The rate of change in humidity in the vehicle cabin is an example of an environmental physical quantity.

[0068] (c) The difference between the temperature of the vehicle cabin and the target temperature value exceeds a predetermined threshold value for the difference (hereinafter referred to as the temperature difference threshold value). If this is set as the external event occurrence condition, the specification receiving unit 434 receives a specification of the temperature difference threshold value from the user. The target temperature value for the vehicle cabin is determined by the control unit 431. The temperature of the vehicle cabin is an example of an environmental physical quantity.

[0069] (d) The difference between the humidity in the vehicle cabin and the target humidity value exceeds a predetermined threshold value for the difference (hereinafter referred to as the humidity difference threshold value). If this is set as the external event occurrence condition, the specification receiving unit 434 receives a specification of the humidity difference threshold value from the user. The target humidity value for the vehicle cabin is determined by the control unit 431. The humidity in the vehicle cabin is an example of an environmental physical quantity.

[0070] (e) The occupancy rate in the vehicle compartment exceeds a predetermined threshold value for that occupancy rate (hereinafter referred to as the occupancy rate threshold value). If this is set as the external event occurrence condition, the specification receiving unit 434 receives a specification of the occupancy rate threshold value from the user. Note that the occupancy rate in the vehicle compartment is an example of an environmental physical quantity.

[0071] (f) The position of the traveling railway vehicle reaches section SC, where the power supply from the overhead wire WR to the power supply circuit 100 of the air conditioning equipment 300 is temporarily cut off. If this is set as an external event occurrence condition, the specification receiving unit 434 receives from the user a specification of the geographical location where section SC is located.

[0072] (g) The position of the traveling railroad vehicle reaches the entrance of a tunnel. If this is set as an external event occurrence condition, the specification receiving unit 434 receives a specification of a geographical position representing the entrance of the tunnel from the user.

[0073] (h) The position of the traveling railroad vehicle has reached the inside of a tunnel. If this is set as an external event occurrence condition, the specification receiving unit 434 receives, from the user, a specification of a geographical position representing the inside of the tunnel.

[0074] (i) When the external event occurrence condition is that the position of the traveling railroad vehicle reaches the exit of a tunnel, the specification receiving unit 434 receives, from the user, a specification of a geographical position representing the exit of the tunnel.

[0075] The control device 400 also includes a determination unit 433 that determines whether or not an external event occurrence condition specified by the specification receiving unit 434 is met. The determination unit 433 determines whether or not the external event occurrence condition is met by monitoring the above-mentioned environmental physical quantities and the position of the railway vehicle while it is running.

[0076] Specifically, the environmental physical quantity data DE representing the above-mentioned environmental physical quantities and the running position data DP representing the position of the railcar while it is running are input to the determination unit 433.

[0077] The environmental physical quantity data DE is provided to the determination unit 433 from a temperature detector (not shown) that detects the temperature of the vehicle cabin, a humidity detector (not shown) that detects the humidity of the vehicle cabin, an occupancy detector (not shown) that detects the occupancy rate, etc. The environmental physical quantity data DE represents environmental physical quantities such as the temperature of the vehicle cabin, the humidity of the vehicle cabin, the rate of change of the temperature of the vehicle cabin, the rate of change of the humidity of the vehicle cabin, and the occupancy rate. However, the rate of change of the temperature of the vehicle cabin may be calculated by the determination unit 433 based on the temperature of the vehicle cabin. Similarly, the rate of change of the humidity of the vehicle cabin may be calculated by the determination unit 433 based on the humidity of the vehicle cabin.

[0078] The traveling position data DP is provided to the determination unit 433 from a higher-level device (not shown) that includes a position detector that detects the geographical position of the railcar while it is traveling.

[0079] The determination unit 433 detects whether an external event occurrence condition designated to the designation reception unit 434 is met by monitoring the environmental physical quantity data DE and the running position data DP in real time while the railway vehicle is in operation.

[0080] The fulfillment of the external event occurrence condition (a) is detected by comparing the environmental physical quantity data DE currently being monitored with the aforementioned temperature change rate threshold. The fulfillment of the external event occurrence condition (b) is detected by comparing the environmental physical quantity data DE currently being monitored with the aforementioned humidity change rate threshold. The fulfillment of the external event occurrence condition (c) is detected by comparing the environmental physical quantity data DE currently being monitored with the aforementioned temperature difference threshold. The fulfillment of the external event occurrence condition (d) is detected by comparing the environmental physical quantity data DE currently being monitored with the aforementioned humidity difference threshold. The fulfillment of the external event occurrence condition (e) is detected by comparing the environmental physical quantity data DE currently being monitored with the aforementioned occupancy rate threshold.

[0081] Furthermore, the fulfillment of the above external event occurrence conditions (g), (h), and (i) is detected when the current position represented by the traveling position data DP reaches the entrance of a specified tunnel, the inside of a specified tunnel, and the exit of a specified tunnel, respectively.

[0082] When the determination unit 433 detects that the external event occurrence condition specified to the specification receiving unit 434 is met, it causes the writing unit 432 to stop overwriting the tracing data DC in the work area of ​​the tracing memory 440 .

[0083] That is, when the determination unit 433 determines that the external event occurrence condition is met, the writing unit 432 stops overwriting the tracing data DC in the work area. By stopping the overwriting, the tracing data DC is left in the work area. Therefore, when an external event occurs, by analyzing the tracing data DC left in the work area, it is possible to trace whether the air conditioning equipment 300 and the control device 400 have behaved appropriately in response to the external event.

[0084] The control device 400 also includes a non-volatile auxiliary memory 420 that stores a control program 421 that defines various functions of the control device 400, and a processor 430 that executes the control program 421. The functions of the control unit 431, writing unit 432, determination unit 433, and designation receiving unit 434 described above are realized by the processor 430 executing the control program 421.

[0085] The control device 400 also includes a record-keeping capacitor 450 that supplies power to the tracing memory 440. The record-keeping capacitor 450 stores power supplied from the overhead line WR and supplies the stored power to the tracing memory 440 as record-keeping power required for the volatile tracing memory 440 to store tracing data DC for the tracing period in its work area. The record-keeping capacitor 450 can be configured using a capacitor.

[0086] Furthermore, the control device 400 also includes a control capacitor 460 that supplies power to the processor 430, in addition to the record-keeping capacitor 450. Like the record-keeping capacitor 450, the control capacitor 460 also stores power supplied from the overhead line WR and supplies the stored power to the processor 430 as control power required for the processor 430 to operate as the control unit 431, the writing unit 432, the determination unit 433, and the specification acceptance unit 434.

[0087] Hereinafter, the sequential update process performed by the writing unit 432 and the determining unit 433 will be specifically described with reference to FIG.

[0088] As shown in FIG. 5, while the air conditioning equipment 300 is operating, the writing unit 432 writes the latest tracking data DC, i.e., the latest detection data DA and control command data DB, into the work area of ​​the tracking memory 440 for an update period that is less than the tracking period (step S1).

[0089] Next, the writing unit 432 determines whether the determination unit 433 has detected that the external event occurrence condition is satisfied, i.e., whether an external event has occurred (step S2). If the external event occurrence condition is not detected to be satisfied (step S2; NO), the process returns to step S1. In this way, step S1 is repeated until the external event occurrence condition is detected to be satisfied.

[0090] As a result, the tracking data DC for the tracking period is accumulated in the work area of ​​the tracking memory 440. After accumulation, each time step S1 is repeated, the work area of ​​the tracking memory 440 is overwritten with the tracking data DC for the latest update period.

[0091] Then, each time the data is overwritten, the tracking data DC for the oldest update period is erased from the work area of ​​the tracking memory 440, and the contents recorded in the work area of ​​the tracking memory 440 are successively updated to the tracking data DC for the latest tracking period.

[0092] On the other hand, if the judgment unit 433 detects that the external event occurrence condition is met (step S2; YES), the writing unit 432 overwrites the tracking data DC for the latest subsequent period Ty in the work area of ​​the tracking memory 440 (step S3), and then stops the overwriting (step S4), and ends this sequential update processing.

[0093] The significance of the processing in step S3 described above will be described with reference to Fig. 6. When the sequential update processing is completed by detecting that an external event occurrence condition is met, the tracking data DC is acquired from the work area of ​​the tracking memory 440 and displayed as a graph, allowing confirmation of the waveform WF for the tracking period T shown in Fig. 6.

[0094] The waveform WF is a graph of the time series data of the output current of the inverter circuit 151 shown in Fig. 3. That is, the time series data represented by the waveform WF is an example of the detection data DA of the tracking data DC.

[0095] The tracking period T is composed of a previous period Tx and a subsequent period Ty. The time t0 at the boundary between the previous period Tx and the subsequent period Ty represents the point in time when the external event occurrence condition is met. Since the tracking data DC for the subsequent period Ty is written in step S3 of Fig. 5, it is possible to confirm not only the waveform WF of the previous period Tx before the external event occurs, but also the waveform WF of the subsequent period Ty after the external event occurs.

[0096] In the waveform WF of the later period Ty, it can be confirmed whether the air conditioning equipment 300 and the control device 400 exhibited appropriate behavior in response to the external event that occurred at time t0. In addition, since the waveform WF of the earlier period Tx can also be confirmed, it is possible to confirm the operation of the air conditioning equipment 300 and the control device 400 up until the external event occurred, and also to compare the waveform WF of the later period Ty with the waveform WF of the earlier period Tx.

[0097] 6 shows one representative waveform WF, but as described above, the tracking data DC includes multiple pieces of time-series data. Therefore, by obtaining the tracking data DC from the work area of ​​the tracking memory 440 and displaying them as a graph, it is possible to check the waveform of each piece of time-series data included in the tracking data DC.

[0098] As described above, according to this embodiment, when an external event occurs, the overwriting of the tracing data DC in the work area of ​​the tracing memory 440 is stopped. Therefore, even if no abnormality has occurred in the air conditioning equipment 300, the tracing data DC left in the work area can be used to later confirm the validity of the behavior shown by the air conditioning equipment 300 and the control unit 431 in response to the external event.

[0099] Furthermore, since the tracing memory 440 is a volatile memory, the writing unit 432 can write the tracing data DC into the tracing memory 440 at a faster writing speed than if the tracing memory 440 were a non-volatile memory.

[0100] Therefore, even if the sampling frequencies of the detection data DA and the control command data DB constituting the tracing data DC are set high, all of the detection data DA and the control command data DB can be written to the tracing memory 440. The tracing data DC generated at a high sampling frequency makes it possible to grasp the sudden behavior of the air conditioning equipment 300 and the control unit 431, thereby improving the accuracy of diagnosing the validity of their operation.

[0101] For example, the sampling frequency of at least one of the time series data included in each of the detection data DA and the control command data DB may be set to 1000 Hz or higher. Note that the sampling frequencies of the time series data included in the detection data DA and the control command data DB may be different from each other.

[0102] Furthermore, since the record-keeping capacitor 450 supplies record-keeping power to the tracking memory 440, even if the power supply from the overhead wire WR is interrupted or stopped when the pantograph PG passes through the section SC, the tracking data DC recorded in the work area of ​​the tracking memory 440 is unlikely to be lost.

[0103] In particular, the record-keeping capacitor 450 supplies power only to the tracking memory 440. The writing power required for the writing unit 432 to write to the tracking memory 440 is supplied separately to the processor 430 by the control capacitor 460. Therefore, the amount of stored power in the record-keeping capacitor 450 is less likely to decrease.

[0104] Therefore, even after the power supply from the overhead line WR is cut off, the contents recorded in the work area of ​​the tracing memory 440 can be retained for several days, and the process leading to the abnormality can be checked at a convenient time several days later. In the case of railway vehicles, it may be difficult to check the contents recorded in the tracing memory 440 while the railway vehicle is in operation, so it is very significant to be able to flexibly adjust the timing for checking the contents recorded in the tracing memory 440.

[0105] The user may specify only one external event occurrence condition or may specify multiple external event occurrence conditions to the specification receiving unit 434. When multiple external event occurrence conditions are set, data identifying which of the multiple external event occurrence conditions has been established (hereinafter referred to as external event identification data) may be written to the work area together with the tracking data DC.

[0106] Specifically, if the determination in step S2 of Fig. 5 is "YES," the determination unit 433 notifies the writing unit 432 of external event identification data indicating which external event occurrence condition has been met. In step S3 of Fig. 5, the writing unit 432 writes the notified external event identification data together with the tracking data DC for the subsequent period Ty into the work area. Then, the writing unit 432 stops overwriting in step S4 of Fig. 5.

[0107] This makes it possible to use the tracking data DC and external event identification data left in the work area to later confirm whether the behavior exhibited by the air conditioning equipment 300 and the control unit 431 is appropriate in response to the external event that occurred.

[0108] [Embodiment 2] In the configuration according to the first embodiment, the tracking memory 440 may have a plurality of work areas, each of which can be written with tracking data DC for the tracking period.

[0109] In this case, by stopping overwriting the work area and switching the work area to be used as the recording destination each time an external event occurrence condition is met, the trace data DC can be stored in a different work area for each external event that occurs. A specific example of this will be described below.

[0110] Hereinafter, among the multiple work areas held by the tracking memory 440, a work area that has not yet been targeted for stopping overwriting will be referred to as an "unsaved work area." Tracking data DC is repeatedly overwritten onto the unsaved work area. On the other hand, a work area that has been targeted for stopping overwriting and in which tracking data DC remains will be referred to as a "saved work area."

[0111] The sequential update process according to this embodiment will be described with reference to Fig. 7. The processes from steps S1 to S4 in Fig. 7 are the same as the processes from steps S1 to S4 shown in Fig. 5, and therefore detailed description thereof will be omitted.

[0112] 7, it is assumed that overwriting of tracking data DC is started in one unsaved work area among the plurality of work areas held in tracking memory 440. After that, in the first step S4, when overwriting of the unsaved work area is stopped, the unsaved work area becomes a saved work area.

[0113] In step S3, the writing unit 432 writes the external event identification data that identifies the external event that occurred in step S2 into the work area together with the tracking data DC for the subsequent period Ty. That is, the external event identification data is left in the saved work area together with the tracking data DC.

[0114] In this embodiment, after stopping the overwriting in step S4, the writing unit 432 determines whether or not any unsaved work area remains among the plurality of work areas that the tracing memory 440 has (step S5).

[0115] If an unsaved work area remains (step S5; YES), the writing unit 432 changes the recording destination used for repeatedly overwriting the tracking data DC from the saved work area used up to step S4 to the unsaved work area (step S6). After that, the process returns to step S1.

[0116] On the other hand, if there are no unsaved work areas remaining (step S5; NO), the writing unit 432 changes the recording destination used for repeatedly overwriting the tracking data DC from the saved work area used up to step S4 to the oldest saved work area (step S7). After that, the process returns to step S1.

[0117] Here, the "oldest saved work area" refers to the saved work area that was the oldest to be targeted for stopping overwriting among the saved work areas that exist at the time of step S7. A specific example will be explained below.

[0118] The tracking memory 440 has N work areas, numbered 1 to N, where N is an integer equal to or greater than 2. When the writing unit 432 stops overwriting the jth work area with the tracking data DC, it changes the recording destination from the jth work area to the j+1th work area and starts overwriting the j+1th work area with the tracking data DC. Here, j is a variable representing an integer equal to or greater than 1 and equal to or less than N-1.

[0119] In other words, the recording destination is switched in order from the first to the Nth work area. In this case, in the processing loop that goes through "RETURN" shown in Fig. 7, the determination of "YES" in step S2 is repeated N+1 times.

[0120] When the determination of "YES" in step S2 for the (N+1)th time is made, all of the first to Nth work areas have already been saved, and no unsaved work areas remain in the tracking memory 440 (step S5; NO). At this time, the first work area corresponds to the "oldest saved work area." This is because, of the first to Nth work areas, the first work area was the first to be targeted for stopping overwriting.

[0121] Therefore, the overwriting of the trace data DC in the first work area is resumed. Note that the pair of the trace data DC and the external event identification data remaining in the first work area is erased by the resumption of the overwriting.

[0122] Furthermore, when the N+k (where k is a variable representing an integer between 2 and N) judging result in step S2 is "YES", the kth work area corresponds to the "oldest saved work area", and overwriting of the kth work area with the tracking data DC is resumed. In this way, overwriting of the oldest saved work area with the tracking data DC is resumed.

[0123] According to this embodiment, even if external events occur frequently, a pair of external event identification data that identifies each external event and tracking data DC can be left in the work area for each external event that occurs. This makes it possible to later check whether the behavior exhibited by the air conditioning equipment 300 and the control unit 431 is appropriate for each external event.

[0124] The external event occurrence conditions that represent the plurality of external events that have occurred may be the same or different from one another. The other configurations are the same as those in the first and second embodiments.

[0125] [Embodiment 3] The configurations according to the above-mentioned first and second embodiments may be supplemented with a configuration that enables the user to perform operations such as obtaining the tracking data DC from the work area of ​​the tracking memory 440 and inputting the specification of the external event occurrence conditions to the specification receiving unit 434 at a location inside the railway vehicle that is easily accessible to the user.

[0126] A specific example will be described below. Note that in the following, illustrations and descriptions of the same components as those in the first and second embodiments will be omitted.

[0127] As shown in FIG. 8, the railcar air conditioning device 600 according to this embodiment further includes an interface device 500.

[0128] The control device 400 described above is placed in a location that is not necessarily easy for users (maintenance personnel) to access, such as the roof or underfloor of the railway vehicle, together with the air conditioning equipment 300 shown in Fig. 1. In contrast, the interface device 500 is placed in the crew cabin of the railway vehicle, where the crew performs operations related to the operation of the vehicle.

[0129] In this specification, the term "crew cabin" refers to a space exclusively used to accommodate crew members, and a space connected to that space and exclusively accessed by crew members. Like a "passenger cabin," a "crew cabin" is included in the concept of a "car cabin," but the concept of a "crew cabin" excludes a "passenger cabin."

[0130] Specifically, the interface device 500 is disposed at the position of an on-board distribution panel in a railway vehicle, so that users such as crew members or maintenance personnel can easily access the interface device 500.

[0131] The interface device 500 has an input interface unit 510 electrically connected to the above-mentioned specification receiving unit 434. A user can specify the above-mentioned external event occurrence condition to the specification receiving unit 434 via the input interface unit 510.

[0132] Specifically, when an external event generating condition is input to a personal computer PC connected to the input interface unit 510 , the input external event generating condition is provided to the specification receiving unit 434 via the input interface unit 510 .

[0133] Furthermore, the user can also edit the external event occurrence conditions that have already been specified in the specification receiving unit 434 through the input interface unit 510. Here, "editing" refers to adding, changing, deleting, etc., of the external event occurrence conditions. Editing of the external event occurrence conditions can also be performed using a personal computer PC connected to the input interface unit 510.

[0134] The interface device 500 also includes an output interface section 520 electrically coupled to the tracking memory 440 described above.

[0135] The user can access the work area where the writing unit 432 has stopped overwriting the tracing data DC through the output interface unit 520. The user can then obtain the tracing data DC and external event identification data remaining in the work area through the output interface unit 520.

[0136] Specifically, the user can retrieve the tracking data DC and the external event identification data left in the work area by using a personal computer PC connected to the output interface unit 520.

[0137] After the tracing data DC and external event identification data remaining in the work area are collected, it becomes possible to resume overwriting the tracing data DC in that work area. That is, by collecting the tracing data DC and external event identification data, the previously saved work area is reset to the previously unsaved work area.

[0138] The interface device 500 also has an overwrite stop instruction unit 530 electrically connected to the above-described writing unit 432. The user can perform an overwrite stop instruction operation on the overwrite stop instruction unit 530 to instruct the writing unit 432 to stop overwriting.

[0139] Specifically, overwrite stop instruction unit 530 is configured by a push button, and the operation of instructing to stop overwrite refers to the operation of pressing the push button.

[0140] The writing unit 432 according to this embodiment stops overwriting the tracing data DC in the work area of ​​the tracing memory 440 not only when the determining unit 433 determines that the external event occurrence condition is met, but also when the user issues an overwriting stop instruction operation to the overwriting stop instruction unit 530. This allows the tracing data DC to remain in the work area at the timing desired by the user.

[0141] As described above, in this embodiment, the interface device 500 is electrically connected to the control device 400 installed outside the passenger compartment of the railway vehicle, and is disposed in the driver's compartment. The interface device 500 has an input interface unit 510, an output interface unit 520, and an overwrite stop instruction unit 530.

[0142] Therefore, the user can specify the external event occurrence condition to the specification receiving unit 434, obtain the tracing data DC from the work area of ​​the tracing memory 440, and instruct the writing unit 432 to stop overwriting, all from a location that is easily accessible.

[0143] The above describes embodiments 1 to 3. The following variations are also possible.

[0144] In the sequential update process shown in FIG. 5 or FIG. 7, the environmental physical quantity data DE and the traveling position data DP may also be recorded in the work area of ​​the tracking memory 440 in addition to the tracking data DC.

[0145] In the above-described embodiments 1 to 3, only when an external event occurs, overwriting of the tracing data DC into the work area of ​​the tracing memory 440 is stopped. In addition to when an external event occurs, similar to the case of Patent Document 1, overwriting of the tracing data DC into the work area of ​​the tracing memory 440 may also be stopped when a physical quantity included in the detection data DA exceeds a predetermined threshold.

[0146] In the first embodiment, the voltage and current are detected as physical quantities related to the operation of the air conditioning equipment 300, but temperature may also be detected. Also, in the first embodiment, the physical quantities related to the operation of the air conditioning equipment 300 are detected from the power supply circuit 100, but they may also be detected from the refrigeration cycle device 200.

[0147] Furthermore, the tracing data DC is not limited to the examples given above. For example, the tracing data DC may be control command data indicating the operation mode of the refrigeration cycle apparatus 200, time series data indicating the temperatures of the outdoor heat exchanger 220 and the indoor heat exchanger 240 of the refrigeration cycle apparatus 200, time series data indicating the temperature of the passenger compartment of the railcar, time series data indicating the temperature of the outside air, time series data indicating the humidity of the passenger compartment of the railcar, time series data indicating the temperatures of various switching elements constituting the power supply circuit 100, etc.

[0148] 1 can be installed on a computer to cause the computer to function as the control device 400. The control program 421 may be distributed via a communication line, or may be stored in a computer-readable, non-transitory recording medium such as an optical disk, a magnetic disk, a magneto-optical disk, or a flash memory and distributed.

[0149] Various aspects of the present disclosure are described below.

[0150] (Appendix 1) a detection unit that repeatedly detects, from an air conditioning device that conditions the air of a passenger compartment of a railway vehicle, an operational physical quantity that represents an operation of the air conditioning device at a predetermined sampling frequency, and generates detection data that represents a time series of detected values ​​of the operational physical quantity; a control unit that controls the air conditioning equipment using the detection data; a tracking memory into which tracking data including control command data representing a time series of control commands generated by the control unit to control the air conditioning equipment and the detection data is written, the tracking memory being volatile and having a work area into which the tracking data for a predetermined tracking period can be written; a specification receiving unit that receives a specification of an external event occurrence condition, which is a condition that indicates the occurrence of an external event that may affect the operation of the air conditioning equipment and whose occurrence is defined in relation to an environmental physical quantity that indicates the environment of the passenger compartment or a position of the railway vehicle while it is running; a determination unit that determines whether the external event occurrence condition is met by monitoring the environmental physical quantity or the position of the railway vehicle while it is running; a writing unit that sequentially overwrites the tracing data in the work area to sequentially update the contents recorded in the work area with the tracing data for the latest tracing period, and stops overwriting the tracing data in the work area when the determining unit determines that the external event occurrence condition is met; A recording device for a railway vehicle comprising: (Appendix 2) The external event occurrence condition is: a rate of change in the temperature of the vehicle interior as the environmental physical quantity has exceeded a predetermined threshold value for the rate of change; a change rate of the humidity in the vehicle interior as the environmental physical quantity has exceeded a predetermined threshold value for the change rate; a difference between the temperature of the vehicle interior as the environmental physical quantity and a target value of the temperature exceeds a predetermined threshold value for the difference; a difference between the humidity in the vehicle interior as the environmental physical quantity and a target humidity value exceeds a predetermined threshold value for the difference; Or, the occupancy rate in the vehicle cabin as the environmental physical quantity exceeds a predetermined threshold value for the occupancy rate; A recording device for railway vehicles as set forth in Appendix 1. (Appendix 3) The external event occurrence condition is: the railway vehicle has reached a section where power supply from the overhead lines to the air conditioning equipment is temporarily cut off; Or, the position of the railway vehicle while traveling has reached the entrance of a tunnel, the inside of the tunnel, or the exit of the tunnel; A recording device for railway vehicles as defined in appendix 1 or 2. (Appendix 4) an overwrite stop instruction unit that is arranged in a crew cabin where a crew member performs work, and that performs an overwrite stop instruction operation to instruct the writing unit to stop the overwrite; Furthermore, the writing unit stops overwriting the detection data and the control command data into the work area not only when the determining unit determines that the external event occurrence condition is met but also when the overwriting stop instruction operation is performed on the overwriting stop instruction unit. A recording device for railway vehicles as set forth in any of appendices 1 to 3. (Appendix 5) an input interface unit disposed in a driver's cabin where a driver performs his / her duties; Furthermore, The external event occurrence condition can be specified to the specification receiving unit through the input interface unit. A railway vehicle recording device as set forth in any of appendices 1 to 4. (Appendix 6) an output interface unit disposed in a driver's cabin where a driver performs his / her duties; Furthermore, The work area in which the overwriting of the detection data and the control command data has been stopped by the writing unit can be accessed through the output interface unit, and the detection data and the control command data remaining in the work area can be acquired through the output interface unit. A railway vehicle recording device as set forth in any of appendices 1 to 5. (Appendix 7) the tracking memory has a plurality of the work areas; when the writing unit stops overwriting the detection data and the control command data in one of the work areas, the writing unit overwrites the detection data and the control command data in another of the work areas. A recording device for a railway vehicle as set forth in any of appendices 1 to 6. (Appendix 8) A railway vehicle recording device according to any one of appendices 1 to 7; The air conditioning equipment; An air conditioning system for railway vehicles. [Explanation of symbols]

[0151] 100 power supply circuit, 110 rectifier, 120 input capacitor, 130 chopper circuit, 140 output capacitor, 151-153 inverter circuit, 160 contactor, 171 contactor, 172 current limiting resistor, 173 contactor, 174 AC reactor, 200 refrigeration cycle device, 200a first refrigeration cycle device, 200b second refrigeration cycle device, 211 first compressor, 212 second compressor, 213 synchronous motor, 214 rotor, 215 stator, 216 coil, 220 outdoor heat exchanger, 231 first expander, 232 second expander, 240 indoor heat exchanger, 251 first gas-liquid separator, 252 second gas-liquid separator, 260 outdoor blower, 270 indoor blower, 300 air conditioning equipment, 400 Control device (railroad vehicle recording device), 410 detection unit, 411-416 detection transformers, 420 auxiliary memory, 421 control program, 430 processor, 431 control unit, 431a speed command value output unit, 431b current command value generation unit, 431c current control unit, 431d voltage control unit, 431e calculation unit, 432 writing unit, 433 judgment unit, 434 designation reception unit, 440 tracking memory, 450 record retention capacitor, 460 control capacitor, 500 interface device, 510 input interface unit, 520 output interface unit, 530 overwrite stop instruction unit, 600 railroad vehicle air conditioning unit, CS control command, DA detection data, DB control command data, DC tracking data, DE environmental physical quantity data, DP running position data, PC personal computer, PG pantograph, SC Section, TR transformer, WF waveform, WR overhead line.

Claims

1. a detection unit that repeatedly detects, from an air conditioning device that conditions the air of a passenger compartment of a railway vehicle, an operational physical quantity that represents an operation of the air conditioning device at a predetermined sampling frequency, and generates detection data that represents a time series of detected values ​​of the operational physical quantity; a control unit that controls the air conditioning equipment using the detection data; a tracking memory into which tracking data including control command data representing a time series of control commands generated by the control unit to control the air conditioning equipment and the detection data is written, the tracking memory being volatile and having a work area into which the tracking data for a predetermined tracking period can be written; a specification receiving unit that receives a specification of an external event occurrence condition, which is a condition that indicates the occurrence of an external event that may affect the operation of the air conditioning equipment and whose occurrence is defined in relation to an environmental physical quantity that indicates the environment of the passenger compartment or a position of the railway vehicle while it is running; a determination unit that determines whether the external event occurrence condition is met by monitoring the environmental physical quantity or the position of the railway vehicle while it is running; a writing unit that sequentially overwrites the tracing data in the work area to sequentially update the contents recorded in the work area with the tracing data for the latest tracing period, and stops overwriting the tracing data in the work area when the determining unit determines that the external event occurrence condition is met; A recording device for a railway vehicle comprising:

2. The external event occurrence condition is: a rate of change in the temperature of the vehicle interior as the environmental physical quantity has exceeded a predetermined threshold value for the rate of change; a change rate of the humidity in the vehicle interior as the environmental physical quantity has exceeded a predetermined threshold value for the change rate; a difference between the temperature of the vehicle interior as the environmental physical quantity and a target value of the temperature exceeds a predetermined threshold value for the difference; a difference between the humidity in the vehicle interior as the environmental physical quantity and a target humidity value exceeds a predetermined threshold value for the difference; Or, the occupancy rate in the vehicle cabin as the environmental physical quantity exceeds a predetermined threshold value for the occupancy rate; 2. The recording device for a railway vehicle according to claim 1, wherein:

3. The external event occurrence condition is: the railway vehicle has reached a section where power supply from the overhead lines to the air conditioning equipment is temporarily cut off; Or, the position of the railway vehicle while traveling has reached the entrance of a tunnel, the inside of the tunnel, or the exit of the tunnel; 2. The recording device for a railway vehicle according to claim 1, wherein:

4. an overwrite stop instruction unit that is arranged in a crew cabin where a crew member performs work, and that performs an overwrite stop instruction operation to instruct the writing unit to stop the overwrite; Furthermore, the writing unit stops overwriting the detection data and the control command data into the work area not only when the determining unit determines that the external event occurrence condition is met but also when the overwriting stop instruction operation is performed on the overwriting stop instruction unit.

2. The recording device for a railway vehicle according to claim 1.

5. an input interface unit disposed in a driver's cabin where a driver performs his / her duties; Furthermore, The external event occurrence condition can be specified to the specification receiving unit through the input interface unit.

5. The recording device for a railway vehicle according to claim 1.

6. an output interface unit disposed in a driver's cabin where a driver performs his / her duties; Furthermore, The work area in which the overwriting of the detection data and the control command data has been stopped by the writing unit can be accessed through the output interface unit, and the detection data and the control command data remaining in the work area can be acquired through the output interface unit.

5. The recording device for a railway vehicle according to claim 1.

7. the tracking memory has a plurality of the work areas; when the writing unit stops overwriting the detection data and the control command data in one of the work areas, the writing unit overwrites the detection data and the control command data in another of the work areas.

5. The recording device for a railway vehicle according to claim 1.

8. A railway vehicle recording device according to any one of claims 1 to 4; The air conditioning equipment; An air conditioning system for railway vehicles.

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