JP2013161535A - Abnormality detection device and abnormality detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abnormality detection device capable of detecting an opening/closing state and abnormalities even when wires are reduced.SOLUTION: A voltage dividing part comprises a first contact point outputting a power supplied from a power supply part at a first division ratio, and a second contact point outputting the power supplied from the power supply part at a second division ratio different from the first division ratio. A switch part switches whether or not the first contact point and a first switch resistor part are connected with each other via a second switch resistor part. A voltage detector detects a voltage at the second contact point.

Description

  The present invention relates to an abnormality detection apparatus and an abnormality detection method.

  2. Description of the Related Art Conventionally, an electronic control unit (ECU, Electric Control Unit) that controls functions such as a vehicle engine and air conditioning has been developed. The ECU includes a resistance voltage dividing circuit that divides the supplied power and is connected to a switch for intermittently supplying power, and a voltage detection unit that detects a voltage divided by the resistance voltage dividing circuit. There is. The voltage detection unit may detect an abnormality such as an open / closed state of the switch, a cable disconnection, or a short circuit based on the detected voltage.

  For example, the switch open / close detection device described in Patent Document 1 connects the contact and the ECU with two wires, and detects the open / close of the switch with the remaining one even if one is disconnected. In addition, since different voltages are applied to each wiring through each resistance voltage dividing circuit, the voltage detected by the ECU when the switch is opened when one wiring is disconnected is different from the voltage when the wiring is not disconnected. The occurrence of disconnection is detected using.

JP 2009-181860 A

  However, the switch open / close detection device described in Patent Literature 1 includes two wires for one switch. Therefore, the subject that the weight and cost of the cable used for wiring were required rather than the case where there was one wiring had arisen.

  The present invention has been made in view of the above points, and provides an abnormality detection device that can detect the open / close state and abnormality of a switch even if the number of wirings is reduced.

(1) The present invention has been made to solve the above-described problems, and one aspect of the present invention provides a first contact that outputs power supplied from a power supply unit at a first voltage dividing ratio, and the first contact. A voltage dividing section having a second contact that outputs at a second voltage dividing ratio different from the voltage dividing ratio of 1, and the first contact and the first switch resistance section are connected via a second switch resistance section. An abnormality detection apparatus comprising: a switch unit that switches whether or not, and a voltage detection unit that detects a voltage at the second contact point.

(2) Another aspect of the present invention is the abnormality detection device described above, wherein the voltage dividing unit includes a first voltage dividing resistor unit between the power source unit and the first contact point, and the first voltage dividing unit. A second voltage dividing resistor between the second contact and the second contact, and a third voltage dividing resistor having one end connected to the second contact and the other end grounded. Features.

(3) Another aspect of the present invention is the abnormality detection device described above, wherein the voltage dividing unit has a fourth end in which one end is connected to the first contact and the other end is connected to the switch unit. And a voltage dividing resistor.

(4) Another aspect of the present invention is the above-described abnormality detection device, wherein a resistance value of the first switch resistor unit is larger than a resistance value of the second switch resistor unit.

(5) According to another aspect of the present invention, the first contact that outputs the power supplied from the power supply unit at the first voltage dividing ratio and the second voltage dividing ratio that is different from the first voltage dividing ratio are output. A method in an abnormality detection apparatus comprising: a voltage dividing unit including two contacts; and a switch unit that switches whether or not the first contact and the first switch resistor unit are connected via a second switch resistor unit. The abnormality detecting device includes a step of detecting a voltage at the second contact, and a step of determining whether or not the abnormality detecting device is abnormal based on the detected voltage. It is characterized by.

  According to the present invention, it is possible to detect an open / closed state and an abnormality even if wiring is reduced.

It is the schematic showing the structure of the abnormality detection system which concerns on embodiment of this invention. It is the schematic showing the structure of the abnormality detection apparatus which concerns on this embodiment. It is a flowchart showing the abnormality detection process which concerns on this embodiment. It is the schematic showing the modification of the abnormality detection apparatus which concerns on this embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram illustrating a configuration of an abnormality detection system 1 according to the present embodiment.
The abnormality detection system 1 includes an abnormality detection device 10, a first power supply unit 11, a reference potential point 12, an operation input unit 13, and a display unit 16. The abnormality detection device 10 includes a switch unit 14 and an electronic control unit 15.

The first power supply unit 11 is a DC power supply including a positive electrode terminal 111 and a negative electrode terminal 112, for example, an automobile battery. The first power supply unit 11 supplies power to the electronic control unit 15 from the positive terminal 111 through the switch unit 14. The negative terminal 112 is short-circuited to the reference potential point 12, and the potential at the negative terminal 112 is set as a reference potential and is connected to the electronic control unit 15 through the switch unit 14. The electromotive force of the first power supply unit 11, that is, the terminal voltage between the positive terminal 111 and the negative terminal 112 is represented as _Vbat .

  The operation input unit 13 receives an operation input by the user and opens and closes the conduction of the switch unit 14. The operation input unit 13 includes, for example, an operation rod for switching between operation (on) and non-operation (off) of a process used for driving the vehicle 2. Processes to be switched between operation and non-operation are, for example, headlight lighting, wiper operation, alarm sounding, inter-vehicle distance control, and auto-cruise (also called cruise control or constant speed control).

  The switch unit 14 opens and closes the continuity between the positive terminal 111 of the first power supply unit 11, the reference potential point 12, or both, and the electronic control unit 15 based on the operation input received by the operation input unit 13. That is, the switch unit 14 switches the presence / absence of power supply from the first power supply unit 11 for each process to be switched between operation and non-operation. A more detailed configuration of the switch unit 14 will be described later.

  The electronic control unit 15 is supplied with electric power from the positive terminal 111 through the switch unit 14 and is grounded through the reference potential point 12 and the switch unit 14. The electronic control unit 15 is an electronic control unit (Electronic Control Unit, ECU) that accommodates any of the above-described processes to be switched between operation and non-operation, or any combination thereof.

The electronic control unit 15 includes a connector unit 151 that accommodates a conductive wire to which power is supplied through the switch unit 14 or a grounded conductive wire. The connector portion 151 generally contains a plurality of conducting wires and is adjacent to each other. For this reason, when a force is applied to the surrounding movable part on the conducting wire, the coating may be damaged and adjacent conducting wires may be short-circuited or the conducting wire may be disconnected. The electronic control unit 15 generates voltage state information indicating a voltage state generated by a short circuit or disconnection of the conducting wire, and outputs the generated voltage state information to the display unit 16.
A configuration for the electronic control unit 15 to determine the voltage state information will be described later.

  When the voltage state information input from the electronic control unit 15 indicates an abnormality, the display unit 16 displays that it is abnormal. The display unit 16 is, for example, a warning light included in the instrument panel of the vehicle 2 and lights up when the input voltage state information indicates an abnormality. Moreover, you may display that it is abnormal by the aspect (for example, color, the presence or absence of blinking, blinking time, shape, etc.) which changes with types of abnormality which voltage state information shows. For example, when the voltage state information indicates a short circuit failure, the display unit 16 lights a red warning light. When the voltage state information indicates a disconnection failure, the display unit 16 lights a green warning light. Also good.

Next, the configuration of the abnormality detection apparatus 10 according to the present embodiment will be described.
The same components as those in FIG. 1 will be described with the same reference numerals.
FIG. 2 is a schematic diagram illustrating the configuration of the abnormality detection apparatus 10 according to the present embodiment.
The switch unit 14 includes switch resistor units 141-1 and 141-2, contacts 142-1 and 142-2, and a movable piece 143.
Power is supplied from the first power supply unit 11 to the one end of the switch resistance unit 141-1 at the voltage _Vbat . The other end of the switch resistor unit 141-1 is connected to the contact 142-1 and one end of the switch resistor unit 141-2. The other end of the switch resistor unit 141-2 is connected to the contact 142-2 and the connector unit 151 of the electronic control unit 15. The movable piece 143 opens and closes the contacts 142-1 and 142-2 based on the operation input received by the operation input unit 13. The movable piece 143 conducts the current between the contacts 142-1 and 142-2 when the contacts 142-1 and 142-2 are closed and short-circuited (hereinafter referred to as an ON state). When the movable piece 143 opens and separates the contacts 142-1 and 142-2 (hereinafter referred to as an off state), the movable piece 143 cuts off the current between the contacts 142-1 and 142-2 and switches the switch resistor 141- Pass current through 2. Therefore, the switch unit 14 controls whether or not to pass through the switch resistor unit 141-2 by opening and closing between the contact points 142-1, 142-2.

  Here, the resistance value Ra of the switch resistor unit 141-1 and the resistance value Rb of the switch resistor unit 141-2 may be any value larger than 0Ω. Further, the resistance value Rb may be larger than the resistance value Ra. This is because power from the first power supply unit 11 is supplied through the switch resistor unit 141-1 regardless of whether the switch unit 14 is in an on state or an off state, and thus power consumption by the switch resistor unit 141-1 is suppressed. .

  The electronic control unit 15 includes a connector unit 151, a second power supply unit 152, a voltage dividing unit 153, a voltage detection unit 157, and an abnormality determination unit 158.

The connector part 151 accommodates the conducting wire between the other end of the switch resistor part 141-2 and the voltage dividing part 153.
The second power supply unit 152 is a DC power supply that supplies power to the voltage dividing unit 153 at the voltage _Vcc .

  The voltage dividing unit 153 includes voltage dividing resistors 154-1, 154-2, 154-3, 154-4, contacts 155-1, 155-2, 155-3, and a reference potential point 156. One end of the voltage dividing resistor unit 154-1 is connected to the second power supply unit 152, and the other end of the voltage dividing resistor unit 154-1 is connected to the contact 155-1. One end of the voltage dividing resistor 154-2 is connected to the contact 155-1, and the other end of the voltage dividing resistor 154-2 is connected to the contact 155-2. One end of the voltage dividing resistor 154-3 is connected to the contact 155-2, and the other end of the voltage dividing resistor 154-3 is connected to the contact 155-3. A reference potential point 156 is connected to the contact 155-3. Here, the resistance values of the voltage dividing resistor portions 154-1, 154-2, and 154-3 are represented as R1, R2, and R3, respectively. Therefore, the contact 155-1 outputs the power supplied from the second power supply unit 152 at a voltage division ratio R2 + R3: R1 + R2 + R3. The contact 155-2 outputs the electric power at a voltage division ratio R3: R1 + R2 + R3. Here, the resistance values R1, R2, and R3 may be any value greater than 0Ω.

  One end of the voltage dividing resistor portion 154-4 is connected to the contact 155-1, and the other end of the voltage dividing resistor portion 154-4 is connected to the connector portion 151. In the present embodiment, the voltage dividing resistor unit 154-4 may be omitted, but by providing the voltage dividing resistor unit 154-4, noise components and excessive input from the outside can be suppressed. The resistance value R4 of the voltage dividing resistor unit 154-4 may be set to 0Ω or an arbitrary value larger than 0Ω depending on the input from the first power supply unit 11 and the connection destination of the switch unit 14.

The voltage detection unit 157 detects the voltage between the contacts 155-2 and 155-3 and outputs the detected voltage value to the abnormality determination unit 158.
The abnormality determination unit 158 generates voltage state information indicating the state of the voltage value based on the voltage value input from the voltage detection unit 157.

Here, when the switch unit 14 is turned on a normal, the voltage value _{V a} between the contacts 155-2,155-3 is represented by the formula (1).

Equation (1) is derived by multiplying the sum of the current I1 supplied from the first power supply unit 11 and the current I2 supplied from the second power supply unit 152 by the resistance value R3 of the voltage dividing resistor unit 154-3. Here, the current I1 is obtained by dividing the voltage value _{V bat} switch resistance 141-1, for a total value Ra + R2 + R3 + R4 of the resistance values of the voltage dividing resistor unit 154-4,154-2,154-3. The current I2 is obtained by dividing the voltage value _Vcc by the total resistance value R1 + R2 + R3 of the voltage dividing resistor portions 154-1, 154-2, 154-3.
When the switch unit 14 is normal and in the off state, the voltage V _c between the contacts 155-2 and 155-3 is expressed by Expression (2).

Equation (2) is derived by multiplying the sum of the current I5 supplied from the first power supply unit 11 and the current I2 supplied from the second power supply unit 152 by the resistance value R3 of the voltage dividing resistor unit 154-3. Here, the current I5 is by dividing the voltage value _{V bat} switch resistance unit 141-1 and 141-2, for a total value Ra + Rb + R2 + R3 + R4 of the resistance values of the voltage dividing resistor unit 154-4,154-2,154-3 give It is done.
When the switch unit 14 fails and the first power supply unit 11 is short-circuited to the connector unit 151 (short circuit failure), the voltage Ve between the contacts 155-2 and 155-3 is expressed by Expression (3). .

Equation (3) is derived by multiplying the sum of the current I7 supplied from the first power supply unit 11 and the current I2 supplied from the second power supply unit 152 by the resistance value R3 of the voltage dividing resistor unit 154-3. Here, the current I7 is obtained by dividing the voltage value V _bat by the total value R2 + R3 + R4 of the resistance values of the voltage dividing resistor parts 154-4, 154-2, 154-3.
When the switch unit 14 and the connector unit 151 are disconnected (disconnection failure), the voltage Vg between the contacts 155-2 and 155-3 is expressed by the equation (4).

Expression (4) is derived by multiplying the current I2 supplied from the second power supply unit 152 by the resistance value R3 of the voltage dividing resistor unit 154-3.
Therefore, the abnormality determination unit 158 indicates that the switch unit 14 is in the ON state (normal) when the voltage value input from the voltage detection unit 157 is within _a predetermined error range (for example, ± 0.1 V) from Va. Is determined. Abnormality determination unit 158 generates voltage state information indicating the on state. Abnormality determining unit 158 determines that the switch 14 when the voltage value input from the voltage detector 157 is within the error range determined in advance from the V _c is off (normal). Abnormality determination unit 158 generates voltage state information indicating an off state.

Abnormality determining unit 158 determines that the switch portion 14 is short-circuited when the voltage value input from the voltage detector 157 is within the error range determined in advance from V _e. Abnormality determination unit 158 generates voltage state information indicating a short circuit failure. Abnormality determining unit 158 determines that the switch unit 14 is broken fault when the voltage value input from the voltage detector 157 is within the error range determined in advance from the V _g. The abnormality determination unit 158 generates voltage state information indicating a disconnection failure. The abnormality determination unit 158 outputs the generated voltage state information to the display unit 16.

For example, when V _cc = 5 V, V _bat = 12 V, Ra = 15 kΩ, Rb = 33 kΩ, R1 = 20 kΩ, R2 = 62 kΩ, R3 = 10 kΩ, R4 = 10 kΩ, V _a = 1.780 V, V _c = 1. 466V, V _e = 2.006V, and V _g = 0.543V. Therefore, in the present embodiment, based on the voltage value detected by the voltage detection unit 157, it is possible to distinguish between opening / closing of the switch unit 14, short circuit failure, and disconnection failure.

Next, the abnormality detection process according to the present embodiment will be described.
FIG. 3 is a flowchart showing the abnormality detection process according to the present embodiment.

(Step S101) The voltage detection unit 157 detects the voltage value V between the contacts 155-2 and 155-3, and outputs the detected voltage value V to the abnormality determination unit 158. Thereafter, the process proceeds to step S102.

(Step S102) The abnormality determination unit 158 determines whether or not the voltage value V input from the voltage detection unit 157 is within _a predetermined error range from Va. When it is determined that the voltage value V is within _a predetermined error range from Va (step S102 YES), the process proceeds to step S103. When the voltage value V is determined not within the error range determined in advance from _{V a} (step S102 NO), the process proceeds to step S104.
(Step S <b> 103) The abnormality determination unit 158 generates voltage state information indicating the on state, and outputs the generated voltage state information to the display unit 16. Thereafter, the process ends.

(Step S104) abnormality determination unit 158, the voltage value V that is input from the voltage detection unit 157 determines whether or not the error range determined in advance from the V _c. When the voltage value V is determined within the error range determined in advance from the _{V c} (step S104 YES), the process proceeds to step S105. When the voltage value V is determined not within the error range determined in advance from the _{V c} (step S104 NO), the process proceeds to step S106.
(Step S <b> 105) The abnormality determination unit 158 generates voltage state information indicating an off state, and outputs the generated voltage state information to the display unit 16. Thereafter, the process ends.

(Step S106) abnormality determination unit 158, the voltage value V that is input from the voltage detection unit 157 determines whether or not the error range determined in advance from V _e. When the voltage value V is determined within the error range determined in advance from _{V e} (step S106 YES), the process proceeds to step S107. When the voltage value V is determined not within the error range determined in advance from _{V e} (step S106 NO), the process proceeds to step S109.
(Step S <b> 107) The abnormality determination unit 158 generates voltage state information indicating a short failure, and outputs the generated voltage state information to the display unit 16. Thereafter, the process proceeds to step S108.
(Step S <b> 108) The display unit 16 performs abnormality display in a manner corresponding to the voltage state information that represents the short failure input from the abnormality determination unit 158. Thereafter, the process ends.

(Step S109) abnormality determination unit 158, the voltage value V that is input from the voltage detection unit 157 determines whether or not the error range determined in advance from the V _g. When the voltage value V is determined within the error range determined in advance from _{V g} (step S109 YES), the process proceeds to step S110. When the voltage value V is determined not within the error range determined in advance from V _g (step S109 NO), the process ends.
(Step S <b> 110) The abnormality determination unit 158 generates voltage state information indicating a disconnection failure, and outputs the generated voltage state information to the display unit 16. Then, it progresses to step S111.
(Step S <b> 111) The display unit 16 performs an abnormality display in a manner corresponding to the voltage state information that represents the disconnection failure input from the abnormality determination unit 158. Thereafter, the process ends.

For example, when V _cc = 5 V, V _bat = 12 V, Ra = 15 kΩ, Rb = 33 kΩ, R1 = 20 kΩ, R2 = 62 kΩ, R3 = 10 kΩ, R4 = 10 kΩ, V _a = 1.780 V, V _c = 1. 466V, V _e = 2.006V, and V _g = 0.543V. Therefore, in the present embodiment, based on the voltage value detected by the voltage detection unit 157, it is possible to distinguish between opening / closing of the switch unit 14, short circuit failure, and disconnection failure.

Next, a modified example of the abnormality detection apparatus 10 according to the present embodiment will be described.
The same components as those in FIG. 2 will be described with the same reference numerals.
FIG. 4 is a schematic diagram illustrating a modification of the abnormality detection device 10 according to the present embodiment.
In FIG. 4, the abnormality detection device 10 is common in that it includes a switch unit 14 and an electronic control unit 15. However, it differs from FIG. 2 in that one end of the switch resistor unit 141-1 is connected to the reference potential point 12 instead of the first power source unit 11. Therefore, the voltage value between the contacts 155-2 and 155-3 detected by the voltage detection unit 157 is different from that in FIG.

Here, when the switch unit 14 is turned on a normal, the voltage value _{V b} between the contacts 155-2,155-3 is expressed by Equation (5).

The expression in parentheses on the right side of the expression (5) is obtained from the voltage value _Vcc of the second power supply unit 152 and the current I4 flowing to the voltage dividing resistor unit 154-4 and the current I2 flowing to the voltage dividing resistor unit 154-2. This represents a voltage that is reduced by the total current passing through the voltage dividing resistor 154-1. Current I4 is obtained by dividing the voltage value _{V cc} switch resistance 141-1, for a total value Ra + R1 + R4 of the resistance values of the voltage dividing resistor unit 154-1,154-4. The current I2 is obtained by dividing the voltage value _Vcc by the total value R1 + R2 + R3 of the resistance values of the voltage dividing resistor parts 154-1, 154-2, 154-3. R3 / (R2 + R3) in Expression (5) indicates that the contact 155-2 outputs power at a voltage value divided based on the resistance values R2 and R3 of the voltage dividing resistor units 154-2 and 154-3. Represents.
When the switch unit 14 is in the OFF state a normal, voltage _{V d} between the contacts 155-2,155-3 is represented by the formula (6).

The expression in parentheses on the right side of the expression (6) is the difference between the current I6 flowing to the voltage dividing resistor unit 154-4 and the current I2 flowing to the voltage dividing resistor unit 154-2 from the voltage value _Vcc of the second power supply unit 152. This represents a voltage that is reduced by the total current passing through the voltage dividing resistor 154-1. The current I6 is obtained by dividing the voltage value _Vcc by the total resistance value Ra + Rb + R1 + R4 of the switch resistor unit 141-1, the switch resistor unit 141-2, the voltage dividing resistor units 154-1 and 154-4. Is broken and the reference potential point 12 is short-circuited to the connector portion 151 (short-circuit failure), the voltage V _f between the contacts 155-2 and 155-3 is expressed by Expression (7).

The expression in parentheses on the right side of Expression (7) is the difference between the current I7 flowing from the voltage value _Vcc of the second power supply unit 152 to the voltage dividing resistor unit 154-4 and the current I2 flowing to the voltage dividing resistor unit 154-2. This represents a voltage that is reduced by the total current passing through the voltage dividing resistor 154-1. The current I7 is obtained by dividing the voltage value _Vcc by the total resistance value R1 + R4 of the voltage dividing resistor portions 154-1 and 154-4. When the switch portion 14 and the connector portion 151 are disconnected (disconnected) fault), the voltage between the contacts 155-2,155-3 becomes _{V g.}

Therefore, the abnormality determination unit 158 indicates that the switch unit 14 is in the ON state (normal) when the voltage value input from the voltage detection unit 157 is within a predetermined error range (for example, ± 0.05 V) from _Vb. Is determined. Abnormality determination unit 158 generates voltage state information indicating the on state. Abnormality determining unit 158 determines that the switch 14 when the voltage value input from the voltage detector 157 is within the error range determined in advance from V _d is off (normal). Abnormality determination unit 158 generates voltage state information indicating an off state. Abnormality determination unit 158 determines that switch unit 14 is short-circuited when the voltage value input from voltage detection unit 157 is within a predetermined error range from _Vf . Abnormality determination unit 158 generates voltage state information indicating a short circuit failure. Abnormality determining unit 158 determines that the switch unit 14 is broken fault when the voltage value input from the voltage detector 157 is within the error range determined in advance from the V _g. The abnormality determination unit 158 generates voltage state information indicating a disconnection failure. The abnormality determination unit 158 outputs the generated voltage state information to the display unit 16.

The abnormality detection process performed by the abnormality detection apparatus 10 shown in FIG. 4 is the same as the abnormality detection process shown in FIG. However, step S102, S104, in S106, the voltage value V, respectively _{V a,} V c, instead of determining whether the predetermined error range from _{V e, V} b is the voltage value V, respectively, _{V d} , _Vf , it is determined whether it is within a predetermined error range.

For example, when V _cc = 5V, Ra = 15kΩ, Rb = 33kΩ, R1 = 20kΩ, R2 = 62kΩ, R3 = 10kΩ, R4 = 10kΩ, V _b = 0.235V, V _d = 0.365V, V _f = _0.081V, the V g = 0.543V. Therefore, in the present embodiment, the opening / closing of the switch unit 14, a short circuit failure, and a disconnection failure can be distinguished from each other based on the voltage value detected by the voltage detection unit 157.

  As described above, according to the present embodiment, the first contact that outputs the power supplied from the power supply unit at the first voltage dividing ratio and the second voltage that is output at the second voltage dividing ratio different from the first voltage dividing ratio. Provide contacts. In addition, according to the present embodiment, the voltage at the second contact is detected by switching whether or not the first contact and the first switch resistor are connected via the second switch resistor. Thereby, the detected voltage differs depending on whether the switch is open or closed. Therefore, even if the number of wires is reduced to one for each switch, the open / close state and abnormality of the switch, for example, disconnection failure or short-circuit failure can be detected.

  Although the case where the connector part 151 accommodates one conducting wire has been described as an example for the sake of simplicity, the connector part 151 may accommodate a plurality of conducting wires in the present embodiment. Here, in the present embodiment, each switch unit 14 to be subjected to abnormality detection includes a second power supply unit 152 and a voltage dividing unit 153, and the voltage detecting unit 157 is a voltage dividing resistor unit 154-3 for each switch unit 14. Detect the voltage across

In addition, you may make it implement | achieve a part of abnormality detection apparatus 10 in embodiment mentioned above, for example, the voltage detection part 157, the abnormality determination part 158, with a computer. In that case, the program for realizing the control function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by a computer system and executed. Here, the “computer system” is a computer system built in the abnormality detection apparatus 10 and includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” is a medium that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, In such a case, a volatile memory inside a computer system serving as a server or a client may be included and a program that holds a program for a certain period of time. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.
Moreover, you may implement | achieve part or all of the abnormality detection apparatus 10 in embodiment mentioned above as integrated circuits, such as LSI (Large Scale Integration). Each functional block of the abnormality detection apparatus 10 may be individually made into a processor, or a part or all of them may be integrated into a processor. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. Further, in the case where an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology may be used.

  As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above, and various design changes and the like can be made without departing from the scope of the present invention. It is possible to

DESCRIPTION OF SYMBOLS 1 ... Abnormality detection system, 10 ... Abnormality detection apparatus, 11 ... 1st power supply part, 12 ... Reference potential point,
13 ... Operation input unit, 14 ... Switch unit, 141-1, 141-2 ... Switch resistance unit,
142-1, 142-2 ... contact point, 143 ... movable section,
DESCRIPTION OF SYMBOLS 15 ... Electronic control part, 151 ... Connector part, 152 ... 2nd power supply part, 153 ... Voltage dividing part,
154-1, 154-2, 154-3, 154-4...
155-1, 155-2, 155-3 ... contact, 156 ... reference potential point, 157 ... voltage detection unit, 158 ... abnormality determination unit, 16 ... display unit, 2 ... vehicle

Claims (5)

A voltage dividing unit including a first contact for outputting the power supplied from the power supply unit at a first voltage dividing ratio and a second contact for outputting at a second voltage dividing ratio different from the first voltage dividing ratio;
A switch unit for switching whether to connect the first contact point and the first switch resistor unit via a second switch resistor unit;
A voltage detector for detecting a voltage at the second contact;
An abnormality detection device comprising: The voltage divider is
A first voltage dividing resistor between the power supply and the first contact;
A second voltage dividing resistor between the first contact and the second contact;
A third voltage dividing resistor having one end connected to the second contact and the other end grounded;
The abnormality detection device according to claim 1, comprising: The voltage divider is
A fourth voltage dividing resistor having one end connected to the first contact and the other end connected to the switch;
The abnormality detection device according to claim 2, further comprising:   The abnormality detection device according to claim 1, wherein a resistance value of the first switch resistance unit is larger than a resistance value of the second switch resistance unit. A voltage dividing section comprising a first contact for outputting the power supplied from the power supply section at a first voltage dividing ratio and a second contact for outputting at a second voltage dividing ratio different from the first voltage dividing ratio; A method in an abnormality detection device comprising a first contact and a switch unit that switches whether or not the first switch resistor unit is connected via a second switch resistor unit,
A process in which the abnormality detection device detects a voltage at the second contact;
A process of determining whether or not the abnormality detection device is abnormal based on the detected voltage;
The abnormality detection method characterized by having.

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