JP2009040097A - Casing monitoring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a casing monitoring device for detecting and measuring the casing inside temperature without adding a temperature sensor and a signal conductor, in addition to detection of opening-closing of a casing. <P>SOLUTION: This casing monitoring device has a photodiode 11 arranged in an electronic unit casing 1, a first detecting means 13 detecting an inverse directional current-voltage characteristic of the photodiode 11, a casing opening-closing determining means 14 determining opening-closing the casing 1 based on the detected inverse directional current-voltage characteristic of the photodiode 11 and an inverse directional current-voltage characteristic corresponding to an incident light quantity, a second detecting means 15 detecting a forward directional current-voltage characteristic of the photodiode 11, and a casing inside temperature determining means 16 determining the temperature in the casing 1 based on the detected forward directional current-voltage characteristic of the photodiode 11 and a forward directional current-voltage characteristic corresponding to the temperature. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a housing monitoring device that monitors an open / close state of a housing in which an electronic component such as a power conversion device is housed and an internal temperature state of the housing.

Power modules with high voltage and large current, such as power converters that convert DC power to AC power, mounted on vehicles such as electric vehicles, fuel cell vehicles, and hybrid vehicles, have a cooling function, electromagnetic wave blocking function, and waterproof function It is accommodated in the housing | casing provided.

This type of housing is mounted on the vehicle after the cover is closed, but it is necessary to monitor the open / close state of the housing cover and the temperature inside the housing even after the vehicle is mounted.

As a means for detecting the open / closed state of the cover, a contact type switch is known in which the contact is connected when the cover is closed and the contact is opened when the cover is opened (refer to Patent Document 1 regarding PDA etc.). ). Further, there is known a method for detecting the open / closed state of the opening depending on whether or not the optical sensor detects light (see Patent Document 2).

However, only the opening and closing of the cover can be monitored by the contact type switch or light detection, and the temperature inside the casing cannot be monitored.

Generally, in order to monitor the temperature inside the housing, a temperature sensor such as a thermocouple is separately installed inside the housing, or the temperature is directly measured by inserting the temperature sensor into the housing. When a temperature sensor is installed in each case, the member cost and the installation cost increase, and when the temperature is measured every time the temperature is measured, the temperature sensor is inserted and pulled out, resulting in an increase in manufacturing cost. There was a problem that.

Japanese Patent Application Laid-Open No. 2002-7070 JP 11-270964 A

The problem to be solved by the present invention is a housing monitoring that can monitor the temperature state in the housing in addition to the cover open / closed state of the housing based on the characteristic information of two modes acquired from one photodiode. Is to provide a device.

The present invention relates to a photodiode disposed in a housing in which an electronic unit is disposed, first detection means for detecting a reverse current-voltage characteristic of the photodiode, and a photodiode detected by the first detection means. Based on the reverse current-voltage characteristics, the open / close determining means for determining whether to open / close the housing with reference to the reverse current-voltage characteristics corresponding to the amount of incident light acquired in advance, and the forward current of the photodiode− Based on the second current detection means for detecting the voltage characteristic and the forward current-voltage characteristic of the photodiode detected by the second detection means, the forward current-voltage characteristic corresponding to the temperature acquired in advance is referred to, And a housing temperature determining means for determining the temperature inside the body.

  According to the present invention, in order to obtain the reverse current-voltage characteristics and reverse current-voltage characteristics of one photodiode, and based on these, the open / close state of the housing and the temperature state in the housing are determined. After the housing is assembled, the open / closed state of the housing and the temperature state in the housing can be monitored even under use. For this reason, there is no need to newly install a temperature sensor and signal line for measuring the temperature in the housing, and there is no need to perform insertion / extraction work of the temperature sensor for measuring the temperature in the housing. Cost can be reduced.

<First Embodiment>
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing an electronic unit housing 1 provided with a housing monitoring device according to the present invention. FIG. 2 shows a semiconductor in which an electronic unit such as a housing monitoring device and a power conversion device is housed in the electronic unit housing. It is a longitudinal cross-sectional view which shows embodiment made into a module.

As shown in FIG. 1, an electronic unit housing 1 monitored by the housing monitoring device of this embodiment is composed of a base 3, a side wall 4, a gasket 7 and a lid 5, and as shown in FIG. A housing monitoring device 10 and an electronic unit 2 are accommodated in the body 1.

As shown in FIG. 2, the housing monitoring apparatus 10 of the present embodiment is supported by a bracket 10 a attached to the side wall 4 and is disposed inside the electronic unit housing 1.

  Examples of the electronic unit 2 include a power module used in an electric vehicle. The electronic unit 2 in the case of a power module is composed of a power module 2a, a capacitor 2b, a circuit board 2c, and the like. Fixed on top. Such a power module is equipped with a power conversion semiconductor element such as an insulated gate bipolar transistor IGBT or a field effect transistor MOSFET, and generates a large amount of heat during operation.

In addition, since the electronic unit housing 1 is also often disposed in a high temperature environment such as an engine room, the base 3 is formed of a material having good thermal conductivity and electromagnetic wave shielding properties such as a metal such as aluminum, and is cooled. Cooled by the device. The side wall 4 having four surfaces is mounted on the base 3 by fixing the flange 4 b with bolts 8. The lid 5 is fixed to the flange 4 a of the side wall 4 by bolts 6. Further, a gasket 7 is sandwiched between the flange 4 a and the lid 5.

The side wall 4 has a two-layer structure including a heat insulating outer wall 41 and a metal wall 42. The outer wall 41 is made of a heat insulating material such as resin (in other words, a low thermal conductivity material), and the metal wall 42 is made of a material having high thermal conductivity and electromagnetic wave shielding properties such as metal. Here, the metal wall 42 is molded integrally with the resin outer wall 41. The resin used for the outer wall 41 is preferably one that can withstand a high temperature environment. For example, PBT (polybutylene terephthalate), PA (polyamide), PPS (polyphenylene sulfide), or the like is used. As the metal wall 42, aluminum, copper, brass, steel plate or the like is used. However, it is preferable that the metal wall 42 is as thin, light and easy to process as possible, and aluminum is preferably used from these points. Copper is also suitable in terms of heat dissipation and electromagnetic shielding properties.

The lower end portion of the metal wall 42 is bent into an L shape and exposed at the lower end surface of the flange 4b (exposed portion 42b), and is in contact with the metal base 3. Similarly, the upper end portion of the metal wall 42 is also bent into an L shape and exposed on the upper surface of the flange 4 a (exposed portion 42 a), and the metal wall 42 contacts the lid 5 through the metal plate 71 of the gasket 7. is doing.

Thereby, since the metal base 3, the metal wall 42, and the metal lid 5 surround the electronic unit 2 three-dimensionally, the inner surface of the electronic unit housing 1 is a metal material having excellent thermal conductivity. Thus, the electronic unit 2 is efficiently radiated by being cooled by the refrigerant of the cooling device, and as a result, the temperature rise of the electronic unit 2 can be suppressed. Moreover, since the electronic unit housing 1 is three-dimensionally surrounded by the metal material having excellent electromagnetic shielding properties, the electromagnetic wave emitted from the electronic unit 2 leaks out of the housing or from the outside. It is possible to prevent electromagnetic waves from entering the housing.

Next, the housing monitoring apparatus 10 of this embodiment will be described based on the drawings.

FIG. 3 is a block diagram of the housing monitoring apparatus 10. As shown in FIG. 3, the housing monitoring apparatus 10 of the present embodiment includes a photodiode 11, a connector 12, a first detection unit 13, and a housing open / close determination unit disposed in the electronic unit housing 1. 14, second detection means 15, and in-casing temperature determination means 16.

The photodiode 11 is a light emitting / receiving element utilizing the photovoltaic effect. FIG. 4A shows an example of reverse current-voltage characteristics of the photodiode 11 of the present embodiment. As shown in FIG. 4A, the reverse current-voltage characteristics of the photodiode 11 shift downward (decrease) in the vertical axis (current axis) as the amount of incident light increases and the surroundings become brighter. FIG. 4B shows the forward current-voltage characteristics of the photodiode 11 of the present embodiment. As shown in FIG. 4B, the forward current-voltage characteristic shifts in the horizontal vertical axis (voltage axis) right (increase) direction as the temperature decreases.

The first detection unit 13 detects the reverse current-voltage characteristic of the photodiode at a predetermined or arbitrary detection timing, and sends the detection result to the housing open / close determination unit 14. The reverse current-voltage characteristic of the photodiode to be detected may be a current value under a predetermined voltage value or a current value change pattern within a predetermined voltage value width.

The housing open / close determining means 14 refers to the reverse current-voltage characteristic corresponding to the incident light quantity of the photodiode 11 acquired in advance based on the detected reverse current-voltage characteristic of the photodiode 11. The amount of incident light, that is, the brightness in the housing of the electronic unit 1 is obtained. Since the reverse current-voltage characteristic of the photodiode 11 changes according to the amount of incident light as shown in FIG. 4A, the brightness inside the housing is controlled based on the detected current value under a predetermined voltage value. Can lead.

The case open / close determining means 14 determines that the electronic unit case 1 is open when the incident light amount is greater than or equal to a predetermined value. If the incident light amount is less than the predetermined value, the electronic unit case 1 is closed. Judge that The case opening / closing judgment means 14 sends the judgment result, in particular, the judgment result that the electronic unit housing 1 is open, to the vehicle controller 50 outside the apparatus.

The second detection unit 15 detects the forward current-voltage characteristic of the photodiode at the detection timing, and sends the detection result to the in-casing temperature determination unit 16. The forward current-voltage characteristic of the photodiode to be detected may be a voltage value under a predetermined current value, or may be a voltage value change pattern within a predetermined current value width.

The in-casing temperature determination means 16 refers to the forward current-voltage characteristic according to the temperature of the photodiode 11 acquired in advance based on the detected forward current-voltage characteristic of the photodiode 11, The temperature in the electronic unit housing 1 is obtained. Since the forward current-voltage characteristics of the photodiode 11 change according to the temperature as shown in FIG. 4B, the internal temperature can be derived based on the detected voltage value under a predetermined current value.

The in-casing temperature determination means 16 sends the determined temperature or a determination result indicating that the determined temperature is equal to or higher than a predetermined value to the vehicle controller 50 outside the apparatus.

The cover open / close monitor circuit (first detection means) 13, the housing open / close determination means 14, the temperature monitor circuit (second detection means) 15, and the in-housing temperature determination means 16 are provided in the electronic unit housing 1 in the same manner as the photodiode 11. Or part or all of them may be provided outside the electronic unit housing 1.

The connector 12 connects the first detection means 13 and the case opening / closing determination means 14 to the photodiode 11 or connects the second detection means 15 and the in-case temperature determination means 16 to the photodiode 11.

FIG. 5 shows a circuit when the first detection means 13 and the case opening / closing determination means 14 are connected to the photodiode 11 via the connector 12. At this time, the photodiode 11 functions as an optical sensor. As shown in FIG. 5, the electronic unit housing 1 is provided with a photodiode 11, and a cover open / close monitor circuit (first detection means) 13 for applying a reverse voltage to the photodiode 11 is configured. Yes. The cover open / close monitor circuit (first detection means) 13 detects the reverse current-voltage characteristics of the photodiode 11. The cover open / close monitor circuit (first detection means) 13 of this embodiment detects a reverse current value under a predetermined voltage (including zero) of the photodiode 11. Normally, when the cover is closed, the inside of the electronic unit housing 1 is dark and no current flows through the photodiode 11. On the other hand, when the cover is opened, the inside of the electronic unit housing 1 is bright, and a light amount of a predetermined amount or more enters, and a current flows through the photodiode 11.

The case open / close determining means 14 (CPU) detects the cover of the electronic unit case 1 when the current value under the predetermined voltage detected by the cover open / close monitor circuit (first detection means) 13 is less than the predetermined value (Lo). 5 is determined to be in a closed state, and if the current value under the predetermined voltage detected by the cover open / close monitor circuit (first detection means) 13 is equal to or higher than the predetermined value (Hi), It is determined that the cover 5 is in an opened state. The threshold value of the current value for determining the opening / closing of the housing is preferably set as appropriate according to the size of the electronic unit housing 1, the opening / closing mode of the cover 5, the position of the photodiode 11, and the like. The case opening / closing determination means 14 (CPU) sends information indicating that the electronic unit case 1 is in an open state to the external vehicle controller 50 as necessary.

FIG. 6 shows a circuit in the case where the second detection means 15 and the casing internal temperature determination means 16 are connected to the photodiode 11 via the connector 12. At this time, the photodiode 11 functions as a temperature sensor. As shown in FIG. 6, the electronic unit housing 1 is provided with a photodiode 11, and a temperature monitor circuit (second detection means) 15 that applies a forward voltage to the photodiode 11 is configured. . The temperature monitor circuit (second detection means) 15 is provided with a constant current source 151 and a voltage monitor circuit 152 to detect the forward current-voltage characteristics of the photodiode 11. The temperature monitor circuit (second detection means) 15 of the present embodiment measures a voltage value (diode forward voltage) when a constant current is passed. The casing temperature determination means 16 (CPU) obtains the temperature inside the electronic unit casing 1 based on the voltage value detected by the temperature monitor circuit (second detection means) 15. The casing temperature determination means 16 (CPU) sends temperature information in the electronic unit casing 1 to the external vehicle controller 50 as necessary.

According to this embodiment, it is possible to monitor both the opening and closing of the casing and the temperature in the casing without adding new parts or signal lines. Moreover, when measuring the temperature in a housing | casing, the temperature in a housing | casing can be measured without performing the operation | work which inserts / extracts a temperature sensor in electronic units, such as an inverter, and can reduce a work process.

The amount of heat generated by the electronic unit 2 serving as a heat source varies greatly from one solid to another, and the bus bar connecting the electrodes changes the amount of heat generated depending on the fastening state. It is difficult to guess. In addition, when a temperature sensor such as a thermocouple is inserted into the housing 1 in the shipping inspection after assembling the inverter, continuous operation is performed for two hours, and the temperature of each electronic component is directly measured. It was necessary to measure, and the burden of work cost was large. The housing monitoring apparatus 10 of the present embodiment can actually measure the temperature inside the housing accurately without providing a new temperature detection sensor or incurring work costs.

Further, by providing a connector (switching means), when it is desired to detect the open / closed state of the electronic unit housing 1, the photodiode 11, the first detecting means 13 and the housing open / close determining means 14 are connected by the connector 12, When it is desired to detect the temperature of the electronic unit housing 1, the photodiode 11, the second detecting means 15, and the in-casing temperature judging means 16 can be connected by the connector 12, and as described above, new components and signals can be connected. Both the opening and closing of the housing and the temperature in the housing can be monitored without adding a line.

Second Embodiment
The present embodiment is characterized in that a light emitting element 20 and a light emitting element driving circuit 21 for controlling on / off of light emission and light emission timing of the light emitting element are provided in the electronic unit housing 1. Common to the first embodiment. In order to avoid overlapping explanations, here, the explanation will focus on the different points.

7A shows a circuit diagram when the photodiode 11 and the cover open / close monitor circuit (first detection means) 13 are connected via the connector 12, and FIG. 7B shows the photodiode 11, A circuit diagram when a temperature monitor circuit (second detection means) 15 is connected via a connector 12 is shown.

In the housing monitoring apparatus 10 of the present embodiment, the light emitting element 20 is provided in the electronic unit housing 1 so as to be paired with the photodiode 11, and the vehicle mounted with the electronic unit housing 1 at a predetermined timing, for example, is started. As a trigger, the light emitting element drive circuit 21 causes the light emitting element 20 to emit light. The amount of light when the light emitting element 20 emits light is equivalent to or greater than that when the cover of the electronic unit housing 1 is opened.

By causing the light emitting element 20 provided in the electronic unit housing 1 to emit light, it is possible to artificially create a state in which the cover is opened inside the closed housing 1. When the light emitting element 20 emits light, the inside of the electronic unit housing 1 becomes bright, current flows through the photodiode 11, and the cover open / close monitor circuit (first detection means) 13 detects the current value. The case open / close determining means 14 determines that the detected current value is equal to or greater than a predetermined value, and determines that the case is in an open state. After the light emitting element driving circuit 21 causes the light emitting element 20 to emit light, when the housing open / close determining means 14 determines that the housing 1 is in the open state, the open / close detection function of the housing monitoring device 10, specifically, photo It can be confirmed that the diode 11, the cover open / close monitor circuit (first detection means) 13, and the housing open / close determination means 14 function normally.

According to this embodiment, while producing the same effect as the first embodiment, the following effect is obtained. In the conventional contact type switch, the operation check inspection (failure diagnosis) could not be performed after the casing cover was closed. However, according to the present embodiment, after the electronic unit such as the inverter is accommodated, the vehicle Even after mounting, since the operation check of the case opening / closing detection function can be self-diagnosed without opening the case cover, the reliability of the case monitoring device 10 can be improved.

In addition, as shown in FIG. 7B, the photodiode 11 of the present embodiment is connected to a temperature monitor circuit (second detection means) 15, so that the detection of the opening / closing of the casing and the function of detecting the opening / closing of the casing are performed. The self-diagnosis and the temperature in the electronic unit housing 1 can also be monitored. As a result, the cover open / close detection function and its operation check self-diagnosis can be performed when mounted on a vehicle, etc., and the temperature inside the housing can be checked without inserting or removing the temperature sensor from the inverter when inspecting electronic components such as the inverter Can be detected.

<Third Embodiment>
In the present embodiment, a switching means 30 having a switch 31 and a control means 32 that are connected to the photodiode 11 by switching to a cover open / close monitor circuit (first detection means) 13 or a temperature monitor circuit (second detection means) 15 is provided. The basic configuration is common to the first and second embodiments. In order to avoid overlapping explanations, here, the explanation will focus on the different points.

FIG. 8 is a diagram showing a circuit configuration of the present embodiment. As shown in FIG. 8, the present embodiment includes a switch 31 and a control unit 32 that controls the switch.

Based on the switching signal of the control means 32, the switch 31 changes the connection destination of the photodiode 11 from the cover open / close monitor circuit (first detection means) 13 to the temperature monitor circuit (second detection means) 15 or the temperature monitor circuit. (Second detection means) 15 is switched to the cover open / close monitor circuit (first detection means) 13. The switching signal is preferably written in advance in the CPU of the control means 32, and can be arbitrarily defined depending on whether it is desired to monitor the opening / closing of the cover or the internal temperature of the housing. As the switching signal, “a switching signal indicating that the temperature monitor circuit (second detection means) 15 is connected to the photodiode 11 when a signal indicating the time of shipment of the inverter is input from the outside”, “vehicle-mounted casing 1 When a signal indicating mounting is externally input, a switching signal indicating that the cover open / close monitor circuit (first detection means) 13 is connected to the photodiode 11 ”,“ the externally input signal is a predetermined value or more (or a predetermined value) Is less than a value), a switching signal indicating that the temperature monitor circuit (second detection means) 15 is connected to the photodiode 11 ”,“ when an externally input signal is less than a predetermined value (or more than a predetermined value) Can be exemplified by a switching signal indicating that the cover open / close monitor circuit (first detection means) 13 is connected to the photodiode 11.

According to the present embodiment, the photodiode 11 and the cover open / close monitor circuit (first detection means) 13 or the temperature monitor circuit (second detection means) 15 are obtained while achieving the effects of the first embodiment and the second embodiment described above. The connection can be switched automatically. When it is desired to detect the opening / closing of the electronic unit housing 1 and when the internal temperature of the electronic unit housing 1 is to be measured, the work of changing the connection destination of the photodiode 11 can be reduced.

In the example shown in FIG. 8, the light emitting element 20 and the light emitting element driving circuit 21 are provided. Thereby, the self-diagnosis of the failure of the photodiode 11 and the cover open / close monitor circuit (first detection means) 13 can be performed. In the example shown in FIG. 8, the cover open / close monitor circuit 13 is provided outside the electronic unit housing 1, but may be provided inside the housing 1. Similarly, the temperature monitor circuit 15 is provided inside the electronic unit housing 1, but may be provided outside the housing 1.

<Fourth embodiment>
In this embodiment, a switching means 30 having a switch 31 and a control means 32 that are connected to the photodiode 11 by switching to a cover open / close monitor circuit (first detection means) 13 or a temperature monitor circuit (second detection means) 15 is provided. In this respect, it is the same as in the third embodiment, except that the housing in which the housing monitoring device 10 of the present embodiment is disposed is mounted on the vehicle, and an external signal input to the control means 32 is the vehicle running. It is different from that of the third embodiment in that it is travel information indicating a state. In order to avoid duplicated explanation, here, the explanation will focus on the different points.

FIG. 9 is a diagram illustrating a circuit configuration of the present embodiment. As shown in FIG. 9, the present embodiment includes a switch 31 and a control unit 32 that controls the switch and acquires vehicle travel information from the vehicle side.

The control means 32 switches and connects the cover open / close monitor circuit (first detection means) 13 or the temperature monitor circuit (second detection means) 15 to the photodiode 11 according to the travel information acquired from the vehicle side.

Specifically, the control unit 32 functioning as a switching unit acquires a switching signal indicating that the temperature monitor circuit (second detection unit) 15 is connected to the photodiode 11 when traveling information indicating that the vehicle is traveling is acquired. Is output to the switch 31 and a switching signal indicating that the cover open / close monitor circuit (first detection means) 13 is connected to the photodiode 11 when the travel information indicating that the vehicle is not traveling (for example, when the vehicle is stopped) is acquired. Output to the switch 31.

As the travel information indicating the travel state of the vehicle, for example, a resolver signal (motor rotation sensor signal), a torque command value from a host control unit of the vehicle, a shift position signal, a speed signal, or the like can be used. In the present embodiment, a signal indicating that the rotational speed of the motor is equal to or greater than a predetermined value (or a value within a predetermined range), a signal indicating that the torque command value is equal to or greater than a predetermined value (or a value within a predetermined range), and the shift position is driven. A signal indicating that the vehicle is in a position (or that the vehicle is not in a parking position) and a signal indicating that the speed is greater than or equal to a predetermined value (or a value within a predetermined range) are treated as a “signal indicating that the vehicle is running”. That is, a signal indicating that the number of revolutions of the motor is less than a predetermined value (or a value outside the predetermined range), a signal indicating that the torque command value is less than a predetermined value (or a value outside the predetermined range), and the shift position being driven. A signal indicating that the vehicle is not in a position (or a parking position) and a signal indicating that the speed is less than a predetermined value (or a value other than a predetermined range) are treated as a “signal indicating that the vehicle is not traveling”. Of course, the “signal that the vehicle is not stopped” is the “signal that the vehicle is running” and the “signal that the vehicle is stopped” is the “signal that the vehicle is not running” May be treated as

When the vehicle is traveling, the electronic unit 2 in the housing 1 operates, and the internal temperature of the electronic unit housing 1 rises. On the other hand, when the vehicle is traveling, there is little possibility that the cover of the electronic unit housing 1 is opened. In this embodiment, since the temperature monitor circuit (second detection means) 15 is connected to the photodiode 11 during traveling of the vehicle, the temperature state in the electronic unit housing 1 can be preferentially monitored.

Further, when the vehicle is not traveling, the cover of the electronic unit housing 1 may be opened. On the other hand, since the electronic unit 2 in the housing 1 is not operating, the internal temperature of the electronic unit housing 1 does not rise. In the present embodiment, when the vehicle is not running, the cover opening / closing monitor circuit (first detection means) 13 is connected to the photodiode 11, so that the opening of the cover of the electronic unit housing 1 can be monitored.

According to this embodiment, while exhibiting the effects of the first to third embodiments described above, the temperature of the electronic unit housing 1 is monitored while the vehicle travels in which the temperature inside the housing may increase. The opening / closing of the electronic unit housing 1 can be monitored while the vehicle is not traveling (for example, when it is stopped) where the housing cover may be opened or closed.

Incidentally, in the example shown in FIG. 9, the light emitting element 20 and the light emitting element driving circuit 21 are provided. Thereby, the self-diagnosis of the failure of the photodiode 11 and the cover open / close monitor circuit (first detection means) 13 can be performed. In the example shown in FIG. 9, the cover open / close monitor circuit 13 is provided outside the electronic unit housing 1, but may be provided inside the housing 1. Similarly, the temperature monitor circuit 15 is provided inside the electronic unit housing 1, but may be provided outside the housing 1.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

It is a disassembled perspective view which shows the electronic unit housing | casing by which the housing | casing monitoring apparatus based on this invention is arrange | positioned. It is a longitudinal cross-sectional view which shows the state which accommodated electronic units, such as a housing | casing monitoring apparatus and a power converter device, in the electronic unit housing | casing. It is a block block diagram of a housing | casing monitoring apparatus. 4A and 4B are diagrams for explaining the characteristics of the photodiode. It is a circuit diagram which shows the example at the time of connecting the photodiode of 1st Embodiment, and a cover opening / closing monitor circuit. It is a circuit diagram which shows the example at the time of connecting the photodiode of 1st Embodiment, and the temperature monitor circuit. (A) and (B) are circuit diagrams of the housing monitoring apparatus of the second embodiment. It is a circuit diagram of the housing | casing monitoring apparatus of 3rd Embodiment. It is a circuit diagram of the housing | casing monitoring apparatus of 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electronic unit housing | casing 2 ... Electronic unit 3 ... Base 4 ... Side wall 4a, 4b ... Flange 41 ... Outer wall 42 ... Metal wall 45 ... Inner wall 5 ... Lid 6 ... Bolt 7 ... Gasket 11 ... Photodiode 12 ... Connector 13: Cover open / close monitor circuit, first detection means 14: Case open / close determination means 15 ... Temperature monitor circuit, second detection means 16 ... In-case temperature determination means 20 ... Light emission Element 21 ... Light emitting element driving circuit 30 ... Switching means 31 ... Switch 32 ... Control means

Claims (7)

A photodiode disposed in a housing in which the electronic unit is disposed;
First detecting means for detecting a reverse current-voltage characteristic of the photodiode;
Based on the reverse current-voltage characteristics of the photodiode detected by the first detection means, the reverse current-voltage characteristics corresponding to the amount of incident light acquired in advance is referred to and the case for determining whether the case is opened or closed is determined. Body opening / closing determination means;
Second detection means for detecting a forward current-voltage characteristic of the photodiode;
Based on the forward current-voltage characteristics of the photodiode detected by the second detection means, refer to the forward current-voltage characteristics according to the temperature acquired in advance, and determine the temperature in the casing And a temperature determination means. A light emitting device disposed in the housing;
The housing monitoring apparatus according to claim 1, further comprising a light emission control unit that controls light emission of the light emitting element. The housing monitoring apparatus according to claim 1, further comprising a switching unit that switches and connects the first detection unit or the second detection unit to the photodiode. The housing monitoring apparatus according to claim 3, wherein the switching unit switches and connects the first detection unit or the second detection unit to the photodiode based on a signal acquired from the outside. The housing is mounted on a vehicle;
The switching unit acquires travel information indicating a travel state of the vehicle, and switches and connects the first detection unit or the second detection unit to the photodiode according to the acquired travel information. Chassis monitoring device. When the switching means acquires travel information indicating that the vehicle is traveling, the second detection means is connected to the photodiode, and when the travel information indicates that the vehicle is not traveling, The housing monitoring apparatus according to claim 5, wherein the first detection means is connected to the photodiode. The housing monitoring apparatus according to claim 6, wherein the travel information is information based on any one or more of a vehicle resolver signal, a torque command value, a shift position signal, and travel speed information.

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