JP2019051790A - Interlock device for high voltage equipment - Google Patents

Abstract

To provide an interlock device for high voltage equipment which can accurately detect removal of a connector as a non-safety condition (connector non-connection, failure, and so on) even when a failure occurs in an interlock device itself including an interlock loop.SOLUTION: This interlock device comprises: an interlock loop 16 which is juxtaposed with an HV connector 7 for connecting an electric compressor to an HV battery 8; a voltage level generating part which generates a voltage level which is different according to a state of the interlock loop; a voltage level determination part which outputs a determination result (L/H signal) according to a voltage level which is generated by the voltage level generating part; and a controller 9 which outputs the L/H signal, and diagnoses a state of the interlock loop on the basis of the output of the voltage level determination part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an interlock device for detecting disconnection of a connector that connects a high voltage device such as an electric compressor mounted on a vehicle to a high voltage power source.

  For example, an electric compressor constituting an air conditioner of a vehicle is connected to a high voltage power source (HV battery) by a connector (HV connector). Since there is a risk that an accident such as an electric shock will occur if the connector is disconnected, conventionally, the connector is provided with an interlock loop of an interlock device in order to detect the disconnection of the connector.

  The interlock loop also becomes a closed circuit and an open circuit by the connection / disconnection (disconnection) of the connector. A constant level signal (H level or L level) is output from the controller to this interlock loop, and the interlock loop becomes an open circuit and the signal level to the controller is inverted, so that the connector is not connected. (Displacement) is detected (see, for example, Patent Document 1).

JP 2014-11959 A

  As described above, the conventional interlock device can detect the disconnection of the connector. However, if the interlock loop is short-circuited to the power source or the ground, or if the interlock device itself fails, the disconnection of the connector can be accurately detected. There was a problem that it could not be detected.

  The present invention has been made to solve the conventional technical problem, and not only enables diagnosis of connector connection / disconnection state when the interlock device is normal, but also failure of the interlock loop. It is an object of the present invention to provide an interlock device for high-voltage equipment that can accurately detect the disconnection of the connector as a non-safe state (connector disconnected, failure, etc.) even when the interlock device itself including the failure occurs. .

  In order to solve the above-described problems, an interlock device for a high-voltage device according to the present invention includes an interlock loop provided in an HV connector for connecting a high-voltage device mounted on a vehicle to a high-voltage power supply, A voltage level generation unit that generates different voltage levels according to the state of the loop, a voltage level determination unit that outputs a determination result comprising an L / H signal according to the voltage level generated by the voltage level generation unit, and a voltage level A failure diagnosis unit that diagnoses the state of the interlock loop based on the output of the determination unit, and a detection switching signal output unit that outputs an L / H signal, and the voltage level generation unit includes the state of the interlock loop and the detection switching signal Different voltage levels are generated according to the output of the output unit, and the failure diagnosis unit outputs the output of the voltage level determination unit with respect to the output of the detection switching signal output unit. From the real alignment, characterized in that it diagnose the state of the interlock loop.

  According to a second aspect of the present invention, in the above-described invention, the failure diagnosis unit diagnoses a failure of the interlock device itself including at least connection and disconnection of the HV connector and a failure of the interlock loop. It is characterized by doing.

  According to a third aspect of the present invention, the voltage level generator is composed of a voltage dividing circuit having a plurality of resistors connected to the same power source as the voltage level determination unit. An interlock loop is connected to the voltage dividing circuit.

  According to a fourth aspect of the present invention, there is provided an interlock device for a high voltage device, wherein the voltage level determination unit is composed of a plurality of comparators.

  An interlock device for a high voltage device according to a fifth aspect of the present invention is characterized in that in each of the above inventions, the interlock device is provided in the high voltage device.

  According to a sixth aspect of the present invention, there is provided an interlock device for a high voltage device, wherein the high voltage device is an electric compressor mounted on a vehicle.

  An interlock device for a high voltage device according to the present invention includes an interlock loop provided in an HV connector for connecting a high voltage device mounted on a vehicle to a high voltage power supply, and a voltage that varies depending on the state of the interlock loop. A voltage level generation unit that generates a level, a voltage level determination unit that outputs a determination result including an L / H signal according to the voltage level generated by the voltage level generation unit, and an interface based on the output of the voltage level determination unit A failure diagnosis unit that diagnoses the state of the lock loop and a detection switching signal output unit that outputs an L / H signal are provided. The voltage level generation unit varies depending on the state of the interlock loop and the output of the detection switching signal output unit. In addition to generating the voltage level, the failure diagnosis unit calculates the interrogation from the combination of the output of the voltage level determination unit with respect to the output of the detection switching signal output unit. Since the state of the croup is diagnosed, the failure diagnosis unit performs failure diagnosis of the interlock device itself including connection / disconnection of the HV connector and failure of the interlock loop as shown in the invention of claim 2. Will be able to do.

  As a result, even when the interlock device for the high voltage equipment itself including a failure of the interlock loop fails, the disconnection of the connector is accurately diagnosed as a non-safe state (connector disconnected, failed, etc.) (the connector is in the connected state). Etc.).

  According to a third aspect of the present invention, the voltage level generating unit is constituted by a voltage dividing circuit having a plurality of resistors connected to the same power source as the voltage level determining unit, and an interlock loop is connected to the voltage dividing circuit. By doing so, the voltage level generated by the voltage level generator changes in the state of the interlock loop (closed circuit, open circuit, power supply short circuit, ground short circuit), and it becomes possible to accurately diagnose them.

  Further, if the voltage level determination unit is composed of a plurality of comparators as in the invention of claim 4, it comprises an L / H signal for the voltage level of the voltage level generation unit that changes according to the state of the interlock loop. The determination result can be output.

  In particular, by providing the interlock device for high voltage equipment in the high voltage equipment as in the invention of claim 5, for example, in the case of the high voltage equipment mounted on the vehicle, the interlock of the vehicle controller is provided. Failure diagnosis can be performed on the high voltage device side without connecting a loop.

  The above-described interlock device for high-voltage equipment is extremely effective when applied to an electric compressor as a high-voltage equipment mounted on a vehicle as in the invention of claim 6.

It is a functional block of the inverter 1 for electric compressors as an Example of the high voltage apparatus to which this invention is applied. It is a figure which shows one Example of the electric circuit of the state detection determination circuit 17 in FIG. FIG. 3 is a diagram for explaining the state of the interlock loop of FIG. 2, the voltage level at each point, and the operation of a switch 31.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a functional block of an inverter 1 for an electric compressor constituting a vehicle air conditioner as a high voltage device to which the present invention is applied. In FIG. 1, reference numeral 2 denotes a motor for driving the electric compressor, which is driven by an inverter output circuit 3. Reference numeral 4 denotes a high voltage detection sensor, and reference numeral 6 denotes a filter / capacitor, which are connected via an HV connector 7 to an HV battery 8 as a high voltage power source mounted on the vehicle.

  Reference numeral 9 denotes a controller composed of a microcomputer. The controller 9 drives and controls the motor 2 of the electric compressor. The controller 9 is connected to a LIN transceiver 13 via a bidirectional digital isolator 11 and an optical coupler 12, and this LIN transceiver 13 is connected to a vehicle-side controller (not shown) via a connector (LV connector) 14 and a vehicle communication bus 15. ECU). The controller 9 is connected to the inverter output circuit 3 and outputs a drive signal based on the instruction information from the vehicle-side controller provided from the LIN transceiver 13 to control the inverter output circuit 3.

  Further, 16 is an interlock loop, which is provided alongside the HV connector 7, and when the HV connector 7 is connected, the loop is closed (closed circuit), and when not connected (disconnected), the loop is opened (open circuit). It is set as the structure. The interlock loop 16 is connected to a state detection determination circuit 17, and the state detection determination circuit 17 is connected to the controller 9.

  The low voltage power supply LV + / LV− connected to the inverter is supplied to the inverter circuit as 12V power supply / LVGND. Furthermore, 18 is a DC-DC converter that generates a 15V power supply 21 and a 5V power supply (HV side) 22 from a 12V power supply 19 (low voltage power supply: FIG. 2) drawn into the inverter as LV +. Connected to the inverter output circuit 3, the 5V power supply (HV side) 22 is connected to the controller 9 and the state detection determination circuit 17. Further, the 12V power source 19 and the 5V power source (LV side) 23 are connected to the state detection determination circuit 17.

  The detection switching signal output unit, the failure diagnosis unit, the interlock loop 16 and the state detection determination circuit 17 of the controller 9 constitute the interlock device for high voltage equipment of the present invention. The interlock device for high voltage equipment of the present invention is provided in an electric compressor (high voltage equipment). In the figure, the range shown on the HV side means the high voltage side, and the range shown on the LV side means the low voltage side. To do.

  Next, FIG. 2 shows an embodiment of an electric circuit of the state detection determination circuit 17 of FIG. The state detection determination circuit 17 according to the embodiment includes a circuit formed by connecting voltage dividing resistors 28 and 29 and a switch 31 as a voltage level switching element in series, a voltage dividing circuit 32 including a voltage dividing resistor 42 and a diode 41, The window comparator 36 includes two comparators 33 and 34, optical couplers 37 and 38, a driver 39, and the like.

  In this case, the voltage dividing circuit 32 is connected between the 12V power source 19 and LVGND, and the interlock loop 16 has a connection point (E) between the voltage dividing resistor 28 and the voltage dividing resistor 29 of the voltage dividing circuit 32 and a diode 41. And a connection point (D) of the voltage dividing resistor 42. The diode 41 is connected to a connection point between the voltage dividing resistor 29 and the switch 31, and the direction of the connection point is a forward direction. The voltage dividing resistor 42 is connected between the connection point (D) and LVGND.

  The connection point (E) of the voltage dividing circuit 32 is connected to the inverting input terminal of the comparator 33 and the non-inverting input terminal of the comparator 34. The voltage level of the non-inverting input terminal of the comparator 33 is 8V as a threshold value (F), and the voltage level of the inverting input terminal of the comparator 34 is 4V as a threshold value (G). The output (H) of the comparator 33 and the output (I) of the comparator 34 are connected to the optical coupler 38, and the output 44 of the optical coupler 38 is connected in series with the resistor 46 to the 5V power source 22 (HV side) and HVGND. Connected between. A connection point (J) between the output 44 of the optical coupler 38 and the resistor 46 is connected to the input port 49 of the controller 9.

  The output port 51 of the controller 9 is connected to the input (A) of the optical coupler 37, and the output 47 of the optical coupler 37 is connected in series with the resistor 48 between the 5V power supply (LV side) 23 and LVGND. A connection point (B) between the output 47 of the optical coupler 37 and the resistor 48 is connected to a driver 39, and the switch 31 is opened and closed by the driver 39. 2 constitutes the voltage level generator of the present application, and the window comparator 36 constitutes the voltage level determination unit of the present application. Further, the controller 9 constitutes a failure diagnosis unit and a detection switching signal output unit of the present application, and the failure diagnosis is based on the combination of signals input from the input port 49 with respect to the detection switching signal output from the output port 51. Will do.

  Next, the operation of the interlock device for a high voltage apparatus according to the embodiment will be described with reference to FIGS. 3 shows the state of the interlock loop 16, the signal levels of the output port 51 and the input port 49 of the controller 9, the voltage levels at points (A) to (J) in FIG. Furthermore, the diagnostic result of the controller 9 based on them is shown. First, in the embodiment, it is assumed that the controller 9 alternately outputs an “L” level signal and an “H” level signal from the output port 51 in a predetermined cycle.

(1) When the interlock device for high voltage equipment is normal with the HV connector 7 connected. The HV connector 7 is now connected and the loop of the interlock loop 16 is closed (closed circuit). It is assumed that there is no failure in the interlock loop 16 and the state detection determination circuit 17 of the voltage device interlock device. Further, when the signal (detection switching output signal) output from the output port 51 is “L” level, the input (A) of the optical coupler 37 is assumed to be “H” level. When the signal output from the output port 51 is at “L” level, the input (A) of the optical coupler 37 becomes “H” level, and the output 47 of the optical coupler 37 is turned OFF, so the voltage at the connection point (B). Becomes “H” level, and the output of the driver 39 turns on (closes) the switch 31.

  Here, it is assumed that the voltage dividing resistors 28, 29 and 42 have the same resistance value, and assuming that the forward voltage of the diode 41 is 1V, the switch 31 is turned ON, and the voltage level at the connection point (D) becomes 1V. The voltage level at the connection point (E) is also 1V. When the voltage level of the connection point (E) becomes 1V, the output (H) of the comparator 33 becomes “H” level, and the output (I) of the comparator 34 becomes “L” level, so the input of the optical coupler 38 becomes “L”. Level. Assuming that the output of the optical coupler 38 is turned ON when the input becomes “L” level, the voltage at the connection point (J) becomes “L” level, and the signal at the input port 49 of the controller 9 also becomes “L” level. .

  On the other hand, when the signal output from the output port 51 becomes “H” level, the voltage at the input (A) of the optical coupler 37 becomes “L” level, and the output 47 of the optical coupler 37 is turned on. ) Becomes “L” level, the driver 39 stops the output, and the switch 31 is turned OFF (opened).

  When the switch 31 is turned OFF, the voltage level at the connection point (D) becomes 6V, and the voltage level at the connection point (E) also becomes 6V (because 12V is divided by the voltage dividing resistors 28 and 42). When the voltage level of the connection point (E) becomes 6V, the output (H) of the comparator 33 becomes “H” level and the output (I) of the comparator 34 also becomes “H” level, so the input of the optical coupler 38 becomes “H”. Level. Thereby, since the output 44 of the optical coupler 38 is turned OFF, the voltage at the connection point (J) becomes “H” level, and the signal of the input port 49 of the controller 9 also becomes “H” level.

  When the controller 9 outputs an “L” level signal from the output port 51, the signal at the input port 49 becomes “L” level, and when the controller 9 outputs an “H” level signal, the signal at the input port 49 becomes “H”. When the "" level is reached, it is diagnosed that the HV connector 7 is in a connected state.

(2) When the HV connector 7 is disconnected (disconnected) and the interlock device for high voltage equipment is normal Next, the HV connector 7 is disconnected and the loop of the interlock loop 16 is opened (open circuit). A case where there is no failure in the interlock loop 16 and the state detection determination circuit 17 of the voltage device interlock device will be described. Also in this case, when the signal output from the output port 51 of the controller 9 is at the “L” level, the optical coupler 37 has the input (A) voltage at the “H” level, and the output 47 of the optical coupler 37 is turned OFF. Therefore, the voltage at the connection point (B) becomes “H” level, and the output of the driver 39 turns on (closes) the switch 31.

  Since the interlock loop 16 is now open, when the switch 31 is turned on, the voltage level at the connection point (E) becomes 6 V divided by the voltage dividing resistors 28 and 29. When the voltage level of the connection point (E) becomes 6V, the output (H) of the comparator 33 becomes “H” level, and the output (I) of the comparator 34 also becomes “H” level. H ”level. Thereby, since the output 44 of the optical coupler 38 is turned OFF, the voltage at the connection point (J) becomes “H” level, and the signal of the input port 49 of the controller 9 also becomes “H” level.

  On the other hand, when the signal output from the output port 51 becomes “H” level, the voltage at the input (A) of the optical coupler 37 becomes “L” level, and the output 47 of the optical coupler 37 is turned on. ) Becomes “L” level, the driver 39 stops the output, and the switch 31 is turned OFF (opened).

  Since the interlock loop 16 is now open, when the switch 31 is turned OFF, the voltage level at the connection point (D) remains 0V and the voltage level at the connection point (E) becomes 12V. When the voltage level of the connection point (E) becomes 12V, the output (H) of the comparator 33 becomes “L” level, and the output (I) of the comparator 34 becomes “H” level, so the input of the optical coupler 38 becomes “L”. Level. As a result, the output 44 of the optical coupler 38 is turned ON, so that the voltage at the connection point (J) becomes “L” level, and the signal at the input port 49 of the controller 9 also becomes “L” level.

  When the controller 9 outputs an “L” level signal from the output port 51, the signal at the input port 49 becomes “H” level, and when the controller 9 outputs an “H” level signal, the signal at the input port 49 becomes “L”. ”Level, the HV connector 7 is diagnosed as not connected.

(3) When the interlock loop 16 is short-circuited to the power source Next, the case where the interlock loop 16 is short-circuited to the power source (LV +) will be described. When the interlock loop 16 is short-circuited to the power supply LV (+), regardless of whether the signal output from the output port 51 of the controller 9 is “L” level or “H” level, the connection point (E) The voltage level is 12V.

  When the voltage level of the connection point (E) becomes 12V, the output (H) of the comparator 33 becomes “L” level, and the output (I) of the comparator 34 becomes “H” level, so the input of the optical coupler 38 becomes “L”. Level. Thereby, since the output 44 of the optical coupler 38 is turned ON, the voltage at the connection point (J) becomes “L” level, and the signal of the input port 49 of the controller 9 also becomes “L” level.

  When the controller 9 outputs an "L" level signal from the output port 51, the signal at the input port 49 becomes "L" level, and when the controller 9 outputs an "H" level signal, the signal at the input port 49 is also "L". ”Level, a fault condition is diagnosed (in this case, a power supply short circuit fault of the interlock loop 16).

(4) When the interlock loop 16 is short-circuited to the ground Next, the case where the interlock loop 16 is short-circuited to the ground (LV−) will be described. When the interlock loop 16 is short-circuited to the ground, the connection point (E) is grounded (LV−) regardless of whether the signal output from the output port 51 of the controller 9 is “L” level or “H” level. The voltage level is 0V.

  When the voltage level of the connection point (E) becomes 0V, the output (H) of the comparator 33 becomes “H” level, and the output (I) of the comparator 34 becomes “L” level, so the input of the optical coupler 38 becomes “L”. Level. Thereby, since the output 44 of the optical coupler 38 is turned ON, the voltage at the connection point (J) becomes “L” level, and the signal of the input port 49 of the controller 9 also becomes “L” level.

  As described above, when the controller 9 outputs the “L” level signal from the output port 51, the signal of the input port 49 becomes “L” level, and when the “H” level signal is output, the signal of the input port 49 is also output. Is in the “L” level, a fault condition is diagnosed (in this case, a ground short-circuit fault of the interlock loop 16).

(5) Other failure (for example, output short-circuit failure of the optical coupler 37)
Next, for example, a case where a failure occurs in which the output 47 of the optical coupler 37 is short-circuited will be described. If the output 47 of the optical coupler 37 is short-circuited and the switch 31 remains OFF, when the interlock loop 16 is in the connected state, is the signal output from the output port 51 of the controller 9 at the “L” level? Regardless of the “H” level, the voltage level at the connection point (E) is 6V.

  When the voltage level of the connection point (E) becomes 6V, the output (H) of the comparator 33 becomes “H” level, and the output (I) of the comparator 34 becomes “H” level. Level. Thereby, since the output 44 of the optical coupler 38 is turned OFF, the voltage at the connection point (J) becomes “H” level, and the signal of the input port 49 of the controller 9 also becomes “H” level.

  As described above, when the controller 9 outputs the “L” level signal from the output port 51, the signal of the input port 49 becomes “H” level, and when the “H” level signal is output, the signal of the input port 49 is also output. Is in the “H” level, a failure state is diagnosed (in this case, a failure in which the output 47 of the optical coupler 37 is short-circuited).

  As described in detail above, the interlock device for high voltage equipment of the present invention is provided in the HV connector 7 for connecting the electric compressor (high voltage equipment) mounted on the vehicle to the HV battery 8 (high voltage power source). Interlock loop 16, a voltage level generator that generates different voltage levels according to the state of interlock loop 16, and a determination result (L / H signal) according to the voltage level generated by this voltage level generator A voltage level determination unit for output, a controller 9 (fault diagnosis unit) for diagnosing the state of the interlock loop 16 based on the output of the voltage level determination unit, and a detection switching signal output unit for outputting an L / H signal, The voltage level generation unit generates different voltage levels according to the state of the interlock loop 16 and the output of the detection switching signal output unit, and also performs failure diagnosis. Since the state of the interlock loop 16 is diagnosed from the combination of the output of the voltage level determination unit with respect to the output of the detection switching signal output unit, the controller 9 connects, disconnects, and interlocks the HV connector. A failure diagnosis of the interlock device itself including a failure of the loop 16 can be performed.

  As a result, even when the interlock device for the high voltage equipment itself including a failure of the interlock loop 16 fails, the disconnection of the HV connector 7 is regarded as a non-safe state (connector disconnected, failure, etc.) and the connector is accurately diagnosed (the connector is Misdiagnosis such as being connected) is possible.

  Further, in the embodiment, the voltage level generator is constituted by a voltage dividing circuit 32 having a plurality of voltage dividing resistors 28, 29, 42 connected to a 12V power source 19 (low voltage power source), a diode 41, and a switch 31, Since the interlock loop 16 is connected to the voltage dividing circuit 32, a voltage level (connection point (E) where the voltage level generator is generated by connection / disconnection of the interlock loop 16, power supply short-circuit, or ground short-circuit. ) Voltage level) changes, and it is possible to accurately diagnose them.

  In particular, by providing an interlock device for high voltage equipment in the electric compressor (high voltage equipment) as in the embodiment, failure diagnosis is performed on the electric compressor side without connecting the interlock loop 16 to the controller of the vehicle. Will be able to.

  In the embodiment, the high voltage device interlock device is applied to the electric compressor as the high voltage device mounted on the vehicle. However, the present invention is not limited to this, and the present invention is effective for various high voltage devices mounted on the vehicle. .

  Further, in the embodiment, the failure of the optical coupler 37 is taken as the failure of the state detection determination circuit 17, but failure diagnosis of other elements is possible as well. Further, the voltage level determination unit is configured by the window comparator 36 described in the embodiment, and a logical product (AND) of two outputs of the window comparator 36 is taken as a determination result. However, the specific circuit configuration is not limited thereto. The two outputs of the window comparator 36 may be individually input to the controller 9 for diagnosis. However, according to the circuit configuration as in the embodiment, it is possible to accurately detect the disconnection of the HV connector 7 as a non-safe state (connector disconnected, failure, etc.) with one input port and one optical coupler of the controller 9 one by one. Is possible.

  In addition, the voltage of the 12V power supply 19 (low voltage power supply) connecting the voltage level generation unit and the voltage level determination unit is not necessarily limited to 12V, but within the LV + power supply input voltage range defined by the inverter. If present, the interlock device is allowed to function normally.

1 Inverter for electric compressor 2 Motor 3 Inverter output circuit 7 HV connector 8 HV battery (high voltage power supply)
9 Controller (Failure diagnosis unit, detection switching signal output unit)
16 interlock loop 17 state detection determination circuit (voltage level generation unit, voltage level determination unit)
19 12V power supply (low voltage power supply)
28, 29, 42 Voltage divider resistor (voltage level generator)
31 switch (voltage level generator)
33, 34 Comparator 36 Window comparator (voltage level determination unit)
37, 38 Optical coupler 41 Diode (voltage level generator)
49 Input port (failure diagnosis part)
51 Output port (Detection switching signal output section)

Claims (6)

An interlock device for high-voltage equipment mounted on a vehicle,
An interlock loop attached to an HV connector for connecting the high voltage device to a high voltage power source;
A voltage level generator for generating different voltage levels according to the state of the interlock loop;
A voltage level determination unit that outputs a determination result including an L / H signal according to a voltage level generated by the voltage level generation unit;
A failure diagnosis unit that diagnoses the state of the interlock loop based on the output of the voltage level determination unit;
A detection switching signal output unit for outputting an L / H signal;
The voltage level generation unit generates different voltage levels according to the state of the interlock loop and the output of the detection switching signal output unit,
The failure diagnosis unit diagnoses the state of the interlock loop based on a combination of the output of the voltage level determination unit with respect to the output of the detection switching signal output unit.   2. The high voltage apparatus according to claim 1, wherein the failure diagnosis unit diagnoses a failure of the interlock device itself including at least the connection and disconnection of the HV connector and a failure of the interlock loop. Interlock device.   The voltage level generator is composed of a voltage dividing circuit having a plurality of resistors connected to the same power source as the voltage level determining unit, and the interlock loop is connected to the voltage dividing circuit. The interlock device for high-voltage equipment according to claim 1 or 2.   The said voltage level determination part is comprised from the some comparator, The interlock apparatus for high voltage apparatuses in any one of the Claims 1 thru | or 3 characterized by the above-mentioned.   The interlock device for a high voltage device according to any one of claims 1 to 4, wherein the interlock device is provided in the high voltage device.   The interlock device for a high voltage device according to any one of claims 1 to 5, wherein the high voltage device is an electric compressor mounted on the vehicle.

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