JP5443111B2 - Electric vehicle control device - Google Patents

Description

The present invention relates to an electric vehicle control device.

The conventional electric vehicle control device detects and controls a failure using voltage sensor information when the inverter is stopped. FIG. 8 is a block diagram of a conventional power conversion circuit. FIG. 9 is an overall view of a conventional vehicle. FIG. 10 is a block diagram showing connection between a conventional external device and a control unit.
A conventional electric vehicle control apparatus will be described below with reference to the drawings.

(Constitution)
As shown in FIG. 8, the permanent magnet synchronous motor 1 is connected to the three-phase lines Vu, Vv, and Vw.

The voltage sensor 2 is connected on the Vu line and the Vv line, and the contactor 3 for opening is connected to the Vu line, the Vv line, and the Vw line.
And the current sensor 4 is connected to the Vu line and the Vw line. The inverter 5 and the permanent magnet synchronous motor 1 are connected via a voltage sensor 2, an opening contactor 3, and a current sensor 4.

The filter capacitor 6 is connected to the DC input side opposite to the inverter 5 and the permanent magnet synchronous motor 1.

Inverter 5, filter capacitor 6, and transmission line 7 are connected to control unit 10.

The control unit 10 includes a torque pattern generation unit 11, a vector control 12, a PWM gate pulse generation unit 13, a motor speed calculation unit 14, a gate start / stop control unit 15, and an AND.
A theoretical unit 16 and a failure determination unit 17 are provided.

The torque pattern generation unit 11 is connected to the vector control 12. Vector controller 12
Are connected to the torque pattern generation unit 11, the PWM gate pulse generation gate logic unit 13, the filter capacitor 6, and the current sensor 4. The PWM gate pulse generation gate logic unit 13 is connected to the inverter 5, the vector control 12, and the gate start / stop control unit 15. The motor speed calculation unit 14 is connected to the voltage sensor 2 and the failure determination means 17. The gate start / stop control unit 15 is connected to the AND logic gate 16 and the PWM gate pulse generation gate logic unit 13. The AND logic gate 16 is connected to the failure determination means 17, the gate start / stop control unit 15, and the operation command. The failure determination means 17 is connected to the transmission line 7, the AND logic gate 16, and the motor speed calculation unit 14.

The transmission line 7 connected to an external monitor, an ATO device, or the like is connected to the failure determination means 17.

(Function)
The torque pattern generation unit 11 receives the operation command, the variable load command, and the brake force command and outputs a torque command “TrqRef”.

The vector control unit 12 uses “TrqRef” and the motor current I detected by the current sensor 4.
u, Iw, and the EFC of the voltage value of the filter capacitor 6 are input to the inverter 3
The phase voltage commands “VuRef”, “VvRef”, and “VwRef” are output.

The PWM gate pulse generation gate logic unit 13 outputs 3 from the vector control unit 12.
Phase voltage commands “VuRef”, “VvRef”, “VwRef”, and gate start
The signal “gate start / stop signal” output from the stop control unit 15 is input. When the “gate start / stop signal = H”, the gate is started and the three-phase voltage commands “VuRef”, “VvRef”, “VwRef” are subjected to pulse width modulation (PuLse W
modulated by idtH ModuLation) to the inverter 5 and the three-phase gate signal “Vu
INV "," VvINV ", and" VwINV "are output, and when" gate start / stop signal = L ", the gate is stopped and the inverter 5 is stopped.

The inverter 5 converts the input DC power into a variable voltage / variable frequency 3 whose pulse width is controlled.
Output as phase AC voltages Vu, Vv, Vw. This AC voltage rotates the permanent magnet synchronous motor 1 through an opening contactor 3 which is normally closed.

The motor speed calculation unit 14 outputs the output Vuv of the voltage sensor 2.
Motor speed "Vmot"
Is output to the failure determination means 17.

The failure determination means 17 includes the motor speed “Vmot” output from the motor speed calculator 14 and the V_MON output from the transmission line 7.

Compare
If | V_MOT−Vmot |> reference speed difference, it is determined that there is a failure and “L” is output to the AND logic unit 16.

When | V_MOT−Vmot | ≦ reference speed difference, it is determined as normal and “H” is output to the AND logic unit 16.

For example, the operation command signal is “H” when there is an operation command and “L” when there is no operation command.
Input to the logic unit 16.

The AND logic unit 16 inputs the operation command signal and the determination output of the failure determination means 17 and starts the gate of “H” only when the operation command is “H” and the output of the failure determination means 17 is normal “H”. Output to the stop control unit 15. Even when the operation command is “H”, if the output of the failure determination means 17 is “L”, “L” is output to the gate start / stop control unit 15.

As shown in FIGS. 9 and 10, the electric vehicle control apparatus having such a configuration is attached to the axle of the leading vehicle (vehicles 18a and 18b) for the purpose of displaying the speed on the monitor of the driver's cab. The speed information from the speed sensors 19a and 19b is transmitted via the transmission line 7 to the control unit 10,
The failure determination means 17 can be executed in the control unit 10, the control unit 10a, the control unit 10b, and the control unit c by being input to the control unit 10a, the control unit 10b, and the control unit 10c.

In this way, using the motor speed calculated from the voltage value detected from the voltage sensor 2 and the speed obtained from the external device 9 such as a monitor via the transmission line 7, the failure of the permanent magnet synchronous motor 1 is determined as a permanent magnet. It is possible to detect a failure of the synchronous motor 1.

JP 2008-43069 A

As described above, the conventional electric vehicle control device requires speed information from an external device such as a monitor device, an ATC device, or an ATO device. However, depending on the type of vehicle, there are vehicles that are not equipped with an external device such as a monitor device or an ATO device. In such a vehicle, a conventional electric vehicle management device obtains speed information via the monitor device or the like. It was difficult to determine the failure.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electric vehicle control device capable of performing failure determination without using speed information from an external device such as a monitor device. To do.

In order to achieve the above object, a permanent magnet synchronous motor, a voltage sensor connected to the permanent magnet synchronous motor and detecting a motor voltage of the permanent magnet synchronous motor, and via the permanent magnet synchronous motor and the voltage sensor are connected, an inverter for converting the power of the direct current or alternating current to direct current or alternating current, is connected to the inverter, a current sensor for detecting a motor current of the permanent magnet synchronous motor, connected between said current sensor and the voltage sensor And an electric vehicle control device having a first opening contactor that opens or closes, wherein an electric motor frequency calculating means that calculates an electric motor frequency based on an electric motor voltage detected by the voltage sensor, and the electric motor frequency calculating unit calculates The average frequency of the motors and the frequency of the motors required for the other permanent magnet synchronous motors received. And a failure determination means for determining that the voltage sensor has failed based on the determined difference, and receiving a determination result that the voltage sensor has failed from the failure determination means. And an opening contactor operation determining means for opening the first opening contactor .

According to the present invention, it is possible to make a failure determination without depending on the vehicle model.

The control block diagram of the electric vehicle control apparatus of the 1st Embodiment of this invention. The operation determination logic diagram of the contactor for opening of the 1st Embodiment of this invention. FIG. The block diagram showing the connection between the control units of FIG. The control block diagram of the electric vehicle control apparatus which shows the 2nd Embodiment of this invention. The 1st operation | movement determination logic diagram of the contactor for an open | release of the 2nd Embodiment of this invention. The 2nd operation | movement determination logic diagram of the contactor for an open | release of the 2nd Embodiment of this invention. The block diagram of the conventional power converter circuit. FIG. The block diagram showing the connection of the conventional external device and a control unit.

Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a control block diagram of the electric vehicle control apparatus according to the first embodiment of the present invention. FIG. 2 is an operation determination logic diagram of the contactor for opening according to the first embodiment of the present invention.

(Constitution)
As shown in FIG. 1, a permanent magnet synchronous motor 1 is connected to a three-phase line of Vu, Vv, and Vw.

A voltage sensor 2 is connected on the Vu line and the Vv line, and an opening contactor 3 is provided on each three-phase line,
A current sensor 2 is connected on Vu and Vw. The inverter 5 is a permanent magnet synchronous motor 1
And a voltage sensor 2, an opening contactor 3, and a current sensor 4.

The filter capacitor 6 is connected to the DC input side opposite to the permanent magnet synchronous motor 1.

The voltage sensor 2, the opening contactor 3, the current sensor 4, the inverter 5, and the filter capacitor 6 are connected to the control unit 10.

In the control unit 10, there are a torque pattern generation unit 11, a vector control 12, a PWM gate pulse generation unit 13, an electric motor frequency calculation unit 14, a gate start / stop control unit 15, a failure determination unit 20, an AND logic unit 21, an opening contact. A device operation determination unit 22 is provided.

The torque pattern generation unit 11 is connected to the vector control 12.

The vector control unit 12 is connected to the torque pattern generation unit 11, the PWM gate pulse generation gate logic unit 13, the current sensor 4, and the filter capacitor 6.

The PWM gate pulse generation gate logic unit 13 includes an inverter 5, a vector control unit 12,
A gate start / stop control unit 15 is connected.

The motor frequency 14 is connected to the voltage sensor 2, the transmission line 7, and the failure determination unit 20.

The gate start / stop control unit 15 includes a PWM gate pulse generation gate logic unit 13.
Are connected to the AND logic unit 21.

The failure determination unit 20 is connected to the transmission line 7, the motor frequency calculation unit 14, the AND logic unit 21, and the contactor operation determination unit 22 for opening.

The AND logic unit 21 is connected to the gate start / stop control unit 15, the failure determination unit 20, and the operation command.

The contactor operation determining unit for opening 22 is connected to the contactor for opening 3, the failure determining unit 20, and the operation command.

(Basic action)
The torque pattern generation unit 11 outputs “TrqRef” that is a torque command with the operation command, the variable load command, and the brake force command as inputs.

Vector control unit 12, "TrqRef", 3-phase voltage command of the inverter 5 motor current Iu detected by the current sensor 4, Iw, and the EFC of a filter capacitor voltage as an input "VuRef", "VvRef", "VwRef" Is output to the PWM gate generation gate logic unit 13.

The PWM gate pulse generation gate logic unit 13 includes “VuRef”, “VvRef”, “
VwRef ”and the gate start / stop signal (GST) output from the gate start / stop control unit 15 are input.When the gate start / stop signal =“ H ”, the gate start is“ VuRef ”,“ VvRef ”. “,“ VwRef ”is modulated by pulse width modulation (PuLse WidthH Modulation), and“ VuINV ”,“ VvINV ”,“ VwINV ”are output as three-phase gate signals to the inverter 5. Also, the gate start / stop signal =“ When “L”, as a gate stop, “VuINV
“,” “VvINV” and “VwINV” are not output.

The inverter 5 converts the input DC power into a variable voltage / variable frequency 3 whose pulse width is controlled.
It converts into the alternating voltage Vu, Vv, Vw of a phase, and outputs it. This AC voltage rotates the permanent magnet synchronous motor 1 through a first opening contactor 3 that is normally closed.

The motor frequency calculation unit 14 outputs the output Vuv of the voltage sensor 2.
Motor frequency ωmot as input
Is output to the failure determination unit 20 and the transmission line 7. The motor frequency calculation unit 14 obtains the motor frequency ωmot calculated by the motor voltage Vuv (voltage between UVs) obtained from the voltage sensor 2, but the motor voltage obtained by the voltage sensor 2 is V v w ( VW voltage) or Vwu (WU voltage) may be used.

(Invention action)
The failure determination unit 20 acting as a failure determination unit is configured to transmit the motor frequencies “ωmot1”, “ωmot2”, and the like of a plurality of other permanent magnet synchronous motors 1 (not shown) transmitted by the transmission line 7.
“Ωmot3”,
The motor frequency “ωmot” obtained from the motor frequency calculation unit 14 of the permanent magnet synchronous motor 1 as shown in FIG. 1 is used as an input, and the motor frequencies “ωmot1”, “ω” of a plurality of other machines are input.
The average value of “mot2” and “ωmot3” is obtained, and this average value and the motor frequency “ωmo” of the own machine
The difference of t ″ is taken, and the difference is compared with a reference frequency which is a predetermined value.
| (Ωmot1 + ωmot2 + ωmot3) / 3−ωmot |> If the difference is the reference frequency, it is determined as a failure, and “L” is output to the AND logic unit 21 and the contactor operation determination unit 22 for opening. The comparison result is
| (Ωmot1 + ωmot2 + ωmot3) / 3−ωmot | ≦ reference frequency difference, it is determined as normal and “H” is output to the AND logic unit 21 and the contactor operation determination unit 22 for opening.

The operation command is “H” when there is an operation command, and “L” when there is no operation command.
2 and output to the AND logic unit 21. The opening contactor operation determining unit 22 has an operation of an opening contactor operation determining means for controlling the opening contactor 3.

(When closing the contactor for opening)
Below, the case where the contactor 3 for opening is closed is demonstrated.

When the output signal of the operation command is “H” and the output signal of the failure determination unit 20 is “H”, the AND logic unit 21 and the gate start / stop control unit 15 and the opening contactor operation determination unit A signal “H” is output to 22. Upon receiving the “H” output signal from the AND logic unit 21, the gate start / stop control unit 15 outputs the output signal gate start / stop signal = “H” to the PWM gate pulse generation gate logic unit 13. The contactor operation determination unit 22 receives the operation command and the output signal “H” of the failure determination unit 20 and outputs a closing / opening signal “MKon = close” to close the contactor 3 for opening. Once there is an operation command and the contactor 3 for opening is turned on, the contactor 3 for opening is kept turned on even if there is no operation command. That is, even if the presence / absence of the operation command is repeated, if there is no failure (normal), the closing / opening signal “MKon = closed” is output and the first opening contactor 3 is kept on.

When the first opening contactor 3 is closed, an alternating current from the inverter 5 that has received a signal from the PWM gate pulse generation gate logic unit 13 flows, so that the permanent magnet synchronous motor 1 is in a startable state.

(When opening the contactor for opening)
Next, a case where the opening contactor 3 is opened will be described.

In the AND logic unit 21, the output signal of the operation command is “H” and the output signal of the failure determination unit 20 is “H”.
Is not satisfied, a signal “L” is output to the gate start / stop control unit 15.
That is, when the output signal of the operation command is “H”, but the output signal of the failure determination unit 20 is “L”, the AND logic unit 21 outputs “L” to the gate start / stop control unit 15. AN
Upon receiving the “L” output signal from the D logic unit 21, the gate start / stop control unit 15 outputs the output signal gate start / stop signal = “L” to the PWM gate pulse generation gate logic unit 13. The contactor operation determination unit 22 receives the operation command and the output signal “L” of the failure determination unit 20. At this time, the contactor operation determining unit for opening 22 has an operation command output signal “H”,
Or, the output signal of the failure determination unit 20 is “L” (with failure) regardless of “L” without the output signal.
In this case, the closing / opening signal “MKoff = open” is output, and the opening contactor 3 is opened.

Thus, when the contactor 3 for opening is in an open state, “L” is also input to the PWM gate pulse generation gate logic unit 13, and therefore, the PWM gate pulse generation gate logic unit 13 is connected to the inverter 5. The output signal is also stopped, and the permanent magnet motor is incapable of starting.

The reference frequency difference may be a set value of 0 Hz or more in consideration of an error of the motor frequency “ωmot” in the motor frequency calculation unit 14 due to an offset or noise in the voltage sensor 2. In addition, the motor frequency calculation unit 14 receives the motor voltage Vuv (U
The motor speed “Vmot” calculated by the voltage between V) is obtained. As the motor voltage obtained by the voltage sensor 2, V
You may use vw (voltage between VW) or Vwu (voltage between WU). In this embodiment, the motor frequencies of a plurality of other machines are set to 3 of “ωmot1”, “ωmot2”, and “ωmot3”.
Although there are multiple units, the number of units is not limited to three. A logic diagram for determining the operation of the first contactor 3 for opening is shown in FIG.

(effect)
In the electric vehicle control apparatus having such a configuration, as shown in FIG. 3, a speed sensor 19a attached to the axle of the leading vehicle (vehicle bodies 18a, 18b) for the purpose of displaying the speed on the monitor device of the cab. The speed information from 19b via the transmission line 7 to the control units 10, 10a,
There is no need to input to 10b and 10c. Since speed information from an external device is not required in this way, as shown in FIG. 4, the motor frequency “ωmot” calculated by the own control unit in the control units 10.10a, 10b, and 10c is transmitted through the transmission line 7. Motor frequency “ω mot” transmitted to the other unit control unit and calculated by the own unit control unit in each control unit,
Motor frequency “ωmot1”, “ωmo” of the other unit control unit input via the transmission line 7
The failure determination unit 20 compares t2 ″ and “ωmot3” with the failure determination.
Thereby, it is possible to determine the failure of the voltage sensor 2 without connection to an external device such as a monitor device or an ATO device.

In the present embodiment, the inverter and the failed voltage sensor can be disconnected by detecting the failure of the voltage sensor, turning off the inverter, and opening the contactor for opening.
Further, by opening the contactor for opening, when the electric motor is rotating at high speed, the inverter can be protected from the induced voltage generated by the electric motor.

Therefore, the failure determination unit can be executed without depending on the type of vehicle or the equipment, and the reliability of the device can be improved by the failure determination unit.

(Second Embodiment) (Two open contactors, open second open contactor in case of failure)
A second embodiment according to the present invention will be described in detail with reference to the drawings. FIG. 5 is a control block diagram of the electric vehicle control device showing the second embodiment of the present invention. FIG. 6 is a first operation determination logic diagram of the contactor for opening according to the second embodiment of the present invention. FIG. 7 is a second operation determination logic diagram of the contactor for opening according to the second embodiment of the present invention. In addition, about the thing which has the same structure as FIG. 1 thru | or FIG. 4, the same code | symbol is attached | subjected and description is abbreviate | omitted.

This embodiment is different from the first embodiment in that the second opening contactor 23 is connected between the voltage sensor 2 and the permanent magnet synchronous motor 1, and the opening contactor operation determination unit 22 is turned on. Open signal “M”
The configuration is such that “K1off” is output to the first opening contactor and “MK2off” is output to the second opening contactor 23, and the opening / closing answer signal “MK1ans” of the first opening contactor 3 is output.
Is different from the contactor operation determining unit 22 for opening. Hereinafter, this point will be described in detail.

(Constitution)
As shown in FIG. 5, the second opening contactor 23 is connected to the opening contactor operation determination unit 22. Further, the closing / opening answer signal “MK1ans” of the first opening contactor 3 is connected to the opening contactor operation determination unit 22.

(Invention action)
(When closing the contactor for opening)
Below, the case where the contactor 3 for opening is closed is demonstrated. The AND logic unit 21 outputs a signal “H” to the gate start / stop control unit 15 when the output signal of the operation command is “H” and the output signal of the failure determination unit 20 is “H”. . From AND logic unit 21 "H
The gate start / stop control unit 15 that has received the output signal “” outputs the output signal gate start / stop signal = “H” to the PWM gate pulse generation gate logic unit 13, and the contactor operation determination unit for opening 22 When the operation command and the output signal “H” of the failure determination unit 20 are input, the first on / off signal “MK1off = close” and the second on / off signal “MK” are input.
2off = closed "is output, and the first opening contactor 3 and the second opening contactor 23 are closed. In this way, there is once an operation command, and the first opening contactor 3 and the second opening contactor 23 are closed. After the opening contactor 23 is turned on, the first opening contactor 3 and the second opening contactor 23 are kept turned on even without the operation command, that is, with / without the operation command repeated. If there is no failure (normal), the closing / opening signals “MK1off = closed” and “MK2off = closed” are output to the first opening contactor 3 and the second opening contactor 23, and the first opening is performed. Contactor 3 and second contactor 2 for opening
3 remains closed.

When the first opening contactor 3 and the second opening contactor 23 are closed, an alternating current from the inverter 5 that has received the signal from the PWM gate pulse generation gate logic unit 13 flows, so that the permanent magnet synchronous motor 1 Is ready to start.

(When opening the contactor for opening)
Next, a case where the opening contactor 3 is opened will be described. The AND logic unit 21 outputs a signal “L” to the gate start / stop control unit 15 when the output signal of the operation command is “H” and the output signal of the failure determination unit 20 is not satisfied. That is, when the output signal of the operation command is “H” and the output signal of the failure determination 20 is “L”, “L” is output to the gate start / stop control unit 15. The gate start / stop control unit 15 that has received the output signal “L” from the AND logic unit 21 sets the output signal gate start / stop signal = “L” to P
The operation signal and the output signal “L” of the failure determination unit 20 are input to the contactor operation determination unit for opening 22 which is output to the WM gate pulse generation gate logic unit 13. The contactor operation determination unit for opening 22 outputs the first signal when the output signal of the failure determination unit 20 is “L” (failure) regardless of whether the operation command output signal is “H” or no output signal is “L”. 1 opening / closing signal “MK1off = open” is output to the first opening contactor 3, the first opening contactor 3 is opened, and the second opening signal “MK2off = closing” is output to the second opening contactor 3. Output to the opening contactor 23, and the second opening contactor 23 remains closed.

Thus, when the first open contactor 3 is in the open state, since “L” is also input to the PWM gate pulse generation gate logic unit 13, the PWM gate pulse generation gate logic unit 13 outputs an inverter. The output signal to 5 is also stopped, and the permanent magnet motor is incapable of starting. A logic diagram for determining the operation of the first contactor 3 for opening is shown in FIG.

(When the first contactor for opening is stiff)
Next, when the output signal of the failure determination unit 20 is “L”, the first contactor 3 for opening is opened,
A case will be described in which the second opening contactor 23 is going to be closed, but the first opening contactor 3 is stuck and cannot be opened.

When the first opening contactor 3 is astringent, the first opening contactor 3 remains closed. Therefore, from the first opening contactor 3, a closing / opening answer signal “MK1ans = closed” indicating that the first opening contactor 3 is closed is input to the opening contactor operation determination unit 22.
In other words, the opening contactor operation determination unit 22 sends the first opening / closing signal “1” to the first opening contactor 3.
Despite outputting “MK1off = open”, the first open contactor 3 inputs the open / close answer signal “MK1ans = H” (closed state) to the open contactor operation determination unit 22. .

When it is determined that the first opening contactor 3 cannot be opened and it is determined that the first opening contactor 3 has become hard, the opening contactor operation determination unit 22 sends the second opening / closing signal “2” to the second opening contactor 23. “MK2off = open” is output. In response to the second closing / opening signal “MK2off = open”, the second opening contactor 23 is opened. FIG. 7 shows a logic diagram for determining the operation of the first opening contactor 3 and the second opening contactor 23. Further, a detection delay function is incorporated in consideration of a delay until the opening contactor operation determination unit 22 detects the closing / opening answer signal “MK1ans” of the first opening contactor 3.

In addition, the motor frequency calculation unit 14 calculates the motor voltage Vuv (voltage between UVs) obtained from the voltage sensor 2.
Although the motor frequency ωmot is obtained, Vvw (voltage between VW) or Vwu (voltage between WU) may be used as the motor voltage obtained by the voltage sensor 2. Further, in the present embodiment, the motor frequency of a plurality of other machines is set to three units of ωmot1, ωmot2, and ωmot3.

(effect)
In the electric vehicle control apparatus having such a configuration, in addition to the effects of the first embodiment, in this embodiment, the voltage sensor 2 is provided between the first opening contactor 3 and the second opening contactor 23. When the controller detects a failure in the circuit, the inverter 5 is stopped and only the first opening contactor 3 is opened and the second opening contactor 23 is kept closed. Therefore, the voltage sensor 2 attached to the permanent magnet synchronous motor 1 side from the first opening contactor 3 can detect the motor voltage even when the first opening contactor 3 is open. At this time, since the first contactor 3 for opening is opened, the inverter 5 and the permanent magnet synchronous motor 1
Are separated, and when the permanent magnet synchronous motor 1 is rotating at high speed, the inverter can be protected from the induced voltage generated by the permanent magnet synchronous motor 1.

In addition, when the control device detects a failure in the circuit and tries to stop the inverter 5, but the first opening contactor 3 is stuck and cannot be opened, the second opening contactor 23 is opened. Thus, the inverter 5 and the permanent magnet synchronous motor 1 can be disconnected.

That is, by providing the first opening contactor 3 and the second opening contactor 23, the permanent magnet synchronous motor 1 can be reliably opened from the inverter 5 at the time of failure, and the permanent magnet synchronous motor 1 can be operated at high speed. , The reliability of the apparatus can be improved by protecting the inverter from the induced voltage generated by the electric motor.

1 Permanent magnet synchronous motor 2 Voltage sensor 3 First open contactor 4 Current sensor 5 Inverter 6 Filter capacitor 7 Transmission line 8 Control unit 9 External device (monitor)
DESCRIPTION OF SYMBOLS 10 Control unit 10a Control unit 10b Control unit 10c Control unit 11 Torque pattern generation part 12 Vector control 13 PWM gate pulse generation gate logic part 15 Gate start / stop part 16 AND logic gate 17 Failure determination means 18 Car body 19 Wheel 20 Failure determination part 21 AND logic part 22 Opening contactor operation determination part 23 2nd opening contactor

Claims (3)

A permanent magnet synchronous motor, is connected to the permanent magnet synchronous motor, wherein a voltage sensor for detecting a motor voltage of a permanent magnet synchronous motor is connected via the voltage sensor and the permanent magnet synchronous motor, DC or AC power an inverter for converting a DC or AC, connected to said inverter, a current sensor for detecting a motor current of the permanent magnet synchronous motor, which is connected between the voltage sensor the current sensor, the first to open or close in the electric vehicle control device having a open for contactor,
Motor frequency calculating means for determining a motor frequency based on the motor voltage detected by the voltage sensor;
The difference between the motor frequency obtained by the motor frequency calculation unit and the average value of the plurality of motor frequencies obtained for the other plurality of received permanent magnet synchronous motors is obtained, and the voltage sensor is based on the obtained difference. Failure determination means for determining that the device is malfunctioning;
An electric vehicle control comprising: an opening contactor operation determining means for opening the first opening contactor when receiving a determination result that the voltage sensor has failed from the failure determining means. apparatus. The electric vehicle control device has a second opening for contactor between said permanent magnet synchronous motor and the voltage sensor, the open for contactor operation determination means it said voltage sensor has failed from the failure determining means Upon receiving the determination result of that, the first opening for contactor or the said electric vehicle control device according to claim 1, wherein the second opening for contactors, characterized in that is opened. The opening contactor operation determining means opens the first opening contactor in response to receiving a determination result that the voltage sensor has failed from the failure determining means . 3. The electric vehicle control device according to claim 2, wherein when the opening contactor is inoperable, the second opening contactor is opened.

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