JP6196432B2 - Vehicle control device - Google Patents

Description

The embodiment of the present invention relates to a control device for a vehicle.

Generally, in a railway vehicle, power is collected from an overhead wire by a current collector, and is transformed by a main transformer via a circuit breaker, and power is supplied to a power conversion device. The power converter is switched on and off by the contactor. The power converter supplies power to the motor, and the motor generates driving force to drive the vehicle.

The current detector detects the current flowing between the main circuit unit ground point in the power converter and the power converter ground. When a ground fault occurs, the ground fault detection means determines whether the current detected by the current detector exceeds a predetermined value. When detecting a ground fault, open the circuit breaker and open the vehicle where the ground fault occurred.

JP, 2012-65439, A

However, in the vehicle control device having the conventional ground fault detection means, when a failure occurs in the current detection device portion that detects the ground fault, it is not possible to recognize the state where the failure has occurred. In the event of a failure, the safety maintenance function of the entire vehicle may be dealt with, such as disconnection of a wire and transformer. Therefore, there was a possibility that the stable traveling of the vehicle might be impaired.

The problem to be solved by the present invention is to provide a control device for a vehicle capable of determining a failure of a current detection device portion that detects a ground fault.

A vehicle control device according to an embodiment is a vehicle control device mounted on a vehicle body of a railway vehicle, comprising: a filter capacitor in which a plurality of capacitors are connected in series and whose neutral point is connected to the ground of the vehicle; A filter capacitor is connected, a motor is connected to the output side, a gate signal from the control unit is received, a power conversion unit for driving the motor by switching operation of the switching element, a neutral point of the filter capacitor and grounding of the vehicle body And the current value obtained from the current detector and the first set when the power conversion unit receives the gate signal from the control unit and the power conversion unit is determined to be in operation. When the current value is larger than the first set value by comparing with the value, it is judged as a ground fault and the current value obtained from the current detector is smaller than the first set value Current value is compared with the second set value There are smaller than the second set value and a determination unit for determining a failure of the current detector.

FIG. 1 is a block diagram showing an overall configuration of a vehicle control device according to a first embodiment. FIG. 2 is a flowchart showing the operation of the control unit of the vehicle control device of the first embodiment. FIG. 3 is a diagram showing set values of the determination unit of the first embodiment. FIG. 4 is a block diagram showing the overall configuration of a vehicle control system according to the second embodiment.

Hereinafter, control device control devices according to embodiments will be described with reference to the drawings.

First Embodiment
The first embodiment will be described in detail with reference to FIGS. 1 to 3. FIG. 1 is a block diagram showing an overall configuration of a vehicle control device according to a first embodiment. FIG. 2 is a flowchart showing the operation of the control unit of the vehicle control device of the first embodiment. FIG. 3 is a diagram showing set values of the determination unit of the first embodiment.

(Constitution)
In FIG. 1, overhead wire 1, current collector 2, circuit breaker 3, transformer 4, first ground 5, power conversion circuit 6,
Second ground 7a, third ground 7b, contactor 8, converter 9, motor 10, fourth ground 10a, current detector 11, control unit 20, gate state detection unit 21, input current detection unit 22, determination unit 23,
A ground fault detection unit 24 and a failure detection unit 25 are shown.

The overhead wire 1 is connected to the current collector 2. The current collector 2 is connected to the transformer 4 via the circuit breaker 3. The end of the transformer 4 opposite to the circuit breaker 3 is connected to the first ground 5. The power conversion circuit 6 is connected to the secondary side of the transformer 4.

The converter 9 of the power conversion circuit 6 is connected to the transformer 4 via the contactor 8. Moreover, the conversion part 9 has elements, such as a filter capacitor 9a and the IGBT which is not shown in figure. Two filter capacitors 9a are provided, and the two are connected in series. A second ground 7 a is connected between the filter capacitor 9 a via the resistor 12 and the current detector 11. The output side of the conversion unit 9 is connected to a fourth ground for grounding the motor 10 and the motor 10. Further, the number of filter capacitors is not limited to two, and a plurality of filter capacitors are connected in series, and it is also possible to connect the second ground from its neutral point.

In addition, a control unit 20 is provided in the power conversion circuit 6. The control unit 20 may be outside the power conversion circuit 6. The converter 9 is connected to the gate state detector 21 of the controller 20. The current detector 11 is connected to the input current detection unit 22 of the control unit 9. Gate state detection unit 21
And the input current detection unit 22 are connected to the determination unit 23. Determination unit 23 is connected to ground fault detection unit 24 and failure detection unit 25. The ground fault detection unit 24 is connected to the circuit breaker 3 and the contactor 8. The failure detection unit 25 is connected to the display, the circuit breaker 3 and the contactor 8.

In the present embodiment, the current value detected by the current detector 11 and the gate signal to the conversion unit 9 are input to the determination unit 23 in the control unit 20. A ground fault or a failure of the current detector 11 is determined based on the current value and the operating state of the conversion unit 9 (the state of the gate signal).

In FIG. 1, the current from the overhead wire 1 flows to the converter 9 through the current collector 2, the circuit breaker 3, the transformer 4, and the contactor 8. The overhead wire current is converted into drive power for driving the motor 10 by the converter 9. At this time, when the conversion unit 9 is in operation, a high frequency current flows to the current detector 11.
The principle is that, when the conversion unit 9 is divided into a converter unit and an inverter unit, the secondary winding side in the transformer 4 generated by voltage application of a DC link between the converter unit and the inverter unit and the transformer 4 case Current detector 11 by the stray capacitance between the motor 10 and the casing of the motor 10 generated by application of voltage to the three-phase line between the inverter unit and the motor 10
High frequency current flows. When the conversion unit 9 is stopped, the above-described high frequency current does not flow to the current detector 11.

Hereinafter, using the high frequency current value flowing to the current detector 11 and the information of the operating state of the conversion unit 9,
A processing procedure for determining whether a ground fault has occurred in the power conversion circuit 6, whether the current detector 11 has a failure, or whether the inside of the power conversion circuit 6 is operating normally will be described using FIGS. 2 and 3 Explain.

As shown in FIG. 2, the gate state detection unit 21 of the control unit 20 detects the operation state of the conversion unit 9 at a certain timing. Further, the input current detection unit 22 detects the current value Iα detected by the current detector 11 at a certain timing. The operation state signal of the gate state detection unit 21 and the current value Iα of the input current detection unit 22 are output to the determination unit 23. At this time, the first set value (IEF), the second set value (IN), and the third set value (IF) are set in the determination unit 23 in advance. The determination unit 23 determines whether the conversion unit 9 is in operation based on the acquired operation state signal (S10). The gate states of the conversion unit 9 are divided into the “operating” and “stopping” states of the changing unit 9. The determination as to "in operation" or "in operation" is based on the operation information of the semiconductor element such as IGBT from the conversion unit 9, the control unit 20 for controlling the conversion unit 9, or control information from outside the power conversion circuit 6 Determine whether it is "in operation" or "stopped". Note that the "operating" of the converter 9, PWM converter and a PWM inverter which constitutes the conversion unit 9, receives a gate signal from the control unit, the internal element is in a gate start state where the switching operation is started An example is given.

If it is determined that conversion unit 9 is in operation, determination unit 23 determines current value Iα and the first set value
IEF) is compared (S11). As a result of comparison, if the current value Iα> the first set value (IEF), it is determined that a large current larger than normal flows in the current detector 11, and it is determined as “ground fault” (S12). At this time, in FIG. 3, the current value Iα reaches the EF region.

On the other hand, when the result of comparing the current value Iα and the first set value (IEF) is current value Iα <first set value (IEF), the determination section 23 determines the current value Iα and the second set value (IN ) Are compared (S13). As a result of comparison, when the current value Iα> the second set value (IN), it is assumed that a current in a state in which the inside of the power conversion circuit 6 is operating normally flows in the current detector 11;
It is determined that "normal" (S14). At this time, in FIG. 3, the current value Iα has reached the N region.

On the other hand, when the result of comparing the current value Iα with the second set value (IN) is current value Iα <second set value (IN), in the determination unit 23, if the conversion unit 9 is in operation , Assuming that a value equal to or less than the current value that can be detected by the current detector 11 is detected, it is determined that the current detector 11 is “fault” (S15). At this time, in FIG. 3, the current value Iα reaches the E region .

If it is determined that the conversion unit 9 is stopped, the determination unit 23 compares the current value Iα with the third set value (IF) (S16). As a result of comparison, current value Iα> third set value (IF)
If the current value detected by the current detector 11 is a current value that can not be detected when the conversion unit 9 is stopped, the current value detected by the current detector 11 is determined as “failure”. Do (S1
7). At this time, in FIG. 3, the current value Iα has reached the N ′ region.

On the other hand, when the result of comparing the current value Iα and the third set value (IF) is current value Iα <third set value (IF), the current detector 11 determines the current for the converter 9 being stopped. Since the power conversion circuit 6 is not detected, it is determined that the inside of the power conversion circuit 6 is in a normal state, and is determined as "normal" (S18). At this time, in FIG. 3, the current value Iα has reached the N ′ region.

The first set value, the second set value, and the third set value used in the above determination are values determined by the overall configuration of the power conversion circuit 6 including the conversion unit 9 and the current detector 11.

As described above, the soundness of the current detector 11 can be confirmed by using the characteristic that the high frequency current flows to the current detector 11 depending on whether or not the converter 9 is in the operating state. On the other hand, when the conversion unit 9 is stopped, the high frequency current does not flow, so the current flowing to the current detector 11 becomes zero, and if the output is zero in this state, the current detector 11 becomes healthy. Therefore, in addition to the determination of "ground fault" and "normal", it is possible to determine "failure".

Next, the processing when the determination unit 23 detects “normal”, “fault”, and “ground fault” will be described. If the determination unit 23 determines that “normal” is determined, the determination unit 23 does not output a signal to the ground fault detection unit 24 and the failure detection unit 25. Therefore, the vehicle maintains the current operation.

If the determination unit 23 determines that “fault” is present, the fault signal is output from the determination unit 23 to the fault signal determination unit 25. The failure detection unit 25 having received the failure signal sends a signal to open the contactor 8. At this time, the failure detection unit 25 keeps sending a signal to open the contactor 8 while the failure signal is continuously output. When the failure signal continues to be input to the failure detection unit 25 even after a predetermined time has elapsed, a signal is output so as to open the circuit breaker 3.

By opening the contactor 8 first, it is possible to electrically disconnect only the power conversion circuit 6 in which a failure of the current detector 11 occurs from the transformer 4. Therefore, when a plurality of power conversion circuits 6 are attached to the transformer 4, the power conversion circuit 6 where no failure occurs is
It becomes possible to detect a ground fault, and it is possible to maintain safe traveling of the whole vehicle.

Further, when the determination unit 23 determines “ground fault”, the ground fault signal is output from the determination unit 23 to the ground fault detection unit 24. The ground fault detection unit 24 having received the ground fault signal outputs a signal to open the circuit breaker 3. The ground fault detection unit 24 may be configured as the circuit breaker 3 unless there is a request for stopping the signal from the outside.
Continue outputting the signal to open the The request for stopping the signal from the outside includes, for example, the input of the stop information of the vehicle travel from the driver's seat and the stop of the operation of the whole vehicle.

Since the power conversion circuit 6 in which the failure has occurred can be determined as a "failure", it can be removed from the control object of the entire vehicle. Therefore, the motor 10 can be driven by the remaining power conversion circuit 6 to continue traveling of the vehicle.

(effect)
According to the control device of the present embodiment, since the failure of the current detector can be identified, it is possible to open only the power conversion circuit in which the contactor has a failure when the failure occurs. When a plurality of power conversion circuits are provided, the occurrence of a ground fault can be detected by the other power conversion circuits. Therefore, stable traveling of the vehicle can be maintained.

Furthermore, since it is possible to confirm the failure state of the current detector at the time of inspection before driving, it is possible to avoid problems due to the failure of these devices while driving, and a more reliable vehicle control device can be obtained. It becomes possible to realize.

Second Embodiment
The second embodiment will be described in detail with reference to the drawings. FIG. 4 is a block diagram showing the overall configuration of a vehicle control system according to the second embodiment. In addition, about what takes the same structure as FIGS. 1-3, a same sign is attached | subjected and description is abbreviate | omitted.

The present embodiment differs from the first embodiment in that a simulated current output unit 26 is provided. Hereinafter, this point will be described in detail.

The simulated current output unit 26 supplies a current to the input current detection unit 22 from the simulated current output unit 15. The determination unit 23 determines whether the current input detection unit 22 is in a failure state based on the input state of the simulated current output unit 26 and the output signal of the input current detection unit 22.

The failure determination means of the current input detection unit 22 will be described below by taking an example.

The output current (Iβ) of the simulated current output unit 15 and the detection current detected by the input current detection unit 22 (
A comparison value (γ (> 0)), which is a sufficiently small value as compared with Iα), is preset in the determination unit 23. The determination unit 23 receives an input of the simulated current output (Iβ), and determines a failure of the input current detection unit 22 according to (Expression 1). If the following equation is satisfied, it is determined that there is no failure.

(Expression 1) | Iα-Iβ | <γ
As another example of the determination means, the current value of IEF when the conversion unit 9 shown in FIG. 3 is in operation, and the current value of IE when the conversion unit 9 is stopped are used. From the simulated current output unit 26, IEF
And a current of IE or more are output to the determination unit 23 together with the "simulated current" signal. The judgment unit 23
Ground fault "or" fault "if determining determines that the input current detector 22 is operating normally. Note at this time, the determination unit 23,""for a determination in response to a signal," simulated current Ground fault
Even in the case where it is determined that "", an open signal of the circuit breaker 3 and the contactor 8 is not output because a ground fault does not actually occur .

(effect)
According to the control device of at least one embodiment described above, it is possible to open only the power conversion circuit in which a failure has occurred by the contactor when a failure occurs, and to detect the occurrence of a ground fault. Therefore, stable traveling of the vehicle can be maintained.

Further, by carrying out the present invention in combination with the failure detection of the current detector 11 in the first embodiment, it is possible to separate and detect the failure of the current detector or the current input detection circuit. As it is possible to detect the failure location, it is possible to quickly analyze the cause of the accident.

In addition, since the fault condition of the current detector or the current input detection circuit can be confirmed at the time of inspection before traveling, it is possible to avoid problems due to the failure of these devices while traveling, which is more reliable. It is possible to realize a high vehicle control device.

In the first and second embodiments, when it is determined that the current detector 11 or the input current detection unit 22 is a failure, the failure determination can be output to the display. On this display, a fault determination in which “fault” has been determined by at least one of the current detector 11 and the input current detection unit 22 is displayed. The display on the display can also be a display that identifies a failure occurrence part.
It is also possible to simply display "fault". By having such display means, it is possible to easily identify the location where the failure has occurred and to carry out quick replacement / repair. The display can be provided on the vehicle, under the floor of the vehicle, or outside the vehicle. Besides the monitor screen and the indicator light, the display can be realized by a buzzer or the like.

By combining such display means with the above embodiment, the failure of the current detector or the current input detection circuit can be isolated and detected, and the display on the vehicle can be used to quickly replace and repair the failure. It becomes.

All embodiments described above are presented as examples and do not limit the scope of the invention. Therefore, the present invention can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and their modifications are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 overhead wire 2 current collection apparatus 3 circuit breaker 4 transformer 5 1st grounding 6 power conversion circuit 7a 2nd grounding 7b 3rd grounding 8 contactor 9 conversion part 10 motor 10a 4th grounding 11 electric current detector 12 resistor 20 control part 21 gate state detection unit 22 input current detection unit 23 determination unit 24 ground fault detection unit 25 failure detection unit

Claims (1)

In a control device for a vehicle mounted on a body of a railway vehicle,
A filter capacitor in which a plurality of capacitors are connected in series and whose neutral point is connected to the ground of the vehicle;
A power converter connected to the input side with the filter capacitor and connected to the output side with the motor, receiving a gate signal from the control unit and switching the switching element to drive the motor;
A current detector provided between the neutral point of the filter capacitor and the ground of the vehicle body;
When the power conversion unit receives the gate signal from the control unit and it is determined that the power conversion unit is in operation, the current value obtained from the current detector is compared with a first set value to determine If the current value is larger than the first set value, it is determined that there is a ground fault, and the current value obtained from the current detector is compared with a second set value smaller than the first set value. A control unit for a vehicle, comprising: a determination unit that determines that the current detector is faulty if the current value is smaller than the second set value.

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