JP2016043892A - Electric-vehicular control apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric-vehicular control apparatus for realizing suppression of both discomfort and erroneous determination in determining a motor torque deviation failure.SOLUTION: An control apparatus, for use in an FF hybrid vehicle that includes a motor-generator 3 in a drive source, includes: a motor current feedback control circuit 221 for controlling a motor current to be applied to the motor-generator 3; and a motor control system failure detection circuit 222 for detecting a failure in a motor control system on the basis of a deviation between motor instruction torque and motor torque. The motor control system failure detection circuit 222 sets plural combinations between a failure determination value of the deviation torque and failure determination time in which a state of exceeding the failure determination value continues, with both the former and the latter different, as a failure determination condition, and determines as a motor torque deviation failure if any one condition of the plurality of set failure determination conditions is established.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a control device for an electric vehicle that includes a motor as a drive source and detects a divergence failure between a motor command torque and a motor torque.

  Conventionally, as a fail-sale technique for hybrid vehicles, when an abnormality in engine output increase / decrease control is detected, if the battery charge capacity is greater than or equal to a predetermined amount and the target output is less than the predetermined output, the engine is stopped and the target output Is generated by a motor. As a result, a hybrid vehicle control device that balances battery protection and driver's required output is known (see, for example, Patent Document 1).

JP 2014-88072 A

  However, in the conventional apparatus, an abnormality in the engine output increase / decrease control is determined by satisfying the condition that the state exceeding the abnormality determination value is continued for the abnormality determination time. Thus, since only one condition is given as the abnormality determination condition, for example, if the determination time is long for the same abnormality determination value, the driver feels uncomfortable, and the determination time for the same abnormality determination value If it is too short, there is a problem that an abnormality is erroneously determined.

  The present invention has been made paying attention to the above problem, and an object of the present invention is to provide a control device for an electric vehicle that can suppress both a sense of incongruity and an erroneous determination when determining a motor torque deviation failure.

In order to achieve the above object, the present invention includes a motor in the drive source.
In this electric vehicle control device, motor torque control means and motor control system failure detection means are provided.
The motor torque control means controls the motor current supplied to the motor based on the motor command torque.
The motor control system failure detection means detects a failure in the motor control system based on a deviation torque that is a difference between the motor command torque and the motor torque obtained from the motor current. And, as a failure determination condition, set a plurality of combination conditions that both the failure determination value of the deviation torque and the failure determination time to continue the state exceeding the failure determination value, among the plurality of failure determination conditions set, If any one of the conditions is satisfied, it is determined that the motor torque deviation failure has occurred.

Therefore, a plurality of combination conditions are set as the failure determination conditions, which are different in both the failure determination value of the deviation torque and the failure determination time for continuing the state exceeding the failure determination value. When any one of the plurality of failure determination conditions is satisfied, it is determined that the motor torque deviation failure is present.
That is, in the case of a failure with a large deviation torque, for example, by setting a combination condition in which the failure determination value is increased and the failure determination time is shortened, the uncomfortable feeling given to the driver can be suppressed. On the other hand, in the case of a failure with a small deviation torque, for example, by making a combination condition in which the failure determination value is reduced and the failure determination time is extended, erroneous determination of motor torque deviation failure can be suppressed.
As a result, when determining a motor torque divergence failure, it is possible to achieve both suppression of a sense of incongruity and suppression of erroneous determination.

1 is an overall system diagram showing a drive system and a motor control system of an FF hybrid vehicle to which a control device of Embodiment 1 is applied. 3 is a flowchart illustrating a flow of a motor control system failure detection process executed by a motor current feedback control circuit and a motor control system failure detection circuit included in the inverter according to the first embodiment. Setting of a combination condition of a failure determination value (predetermined value 1, predetermined value 2) of a deviation torque and a failure determination time (predetermined time 1, predetermined time 2) used when performing the motor control system failure detection process of the first embodiment It is a characteristic view which shows a method.

  Hereinafter, the best mode for realizing an electric vehicle control apparatus of the present invention will be described based on Example 1 shown in the drawings.

First, the configuration will be described.
The configuration of the FF hybrid vehicle (an example of an electric vehicle) to which the control device of the first embodiment is applied will be described separately as “overall system configuration” and “motor control system failure detection processing configuration”.

[Overall system configuration]
FIG. 1 shows a drive system and a motor control system of an FF hybrid vehicle to which the control device of the first embodiment is applied. Hereinafter, the overall system configuration of the FF hybrid vehicle will be described with reference to FIG.

  As shown in FIG. 1, the drive system of the FF hybrid vehicle includes an engine 1 (abbreviated as “Eng”), a first clutch 2 (abbreviated as “CL1”), a motor / generator 3 (abbreviated as “MG”), 2 clutch 4 (abbreviation "CL2") and belt type continuously variable transmission 5 (abbreviation "CVT"). The output shaft of the belt-type continuously variable transmission 5 is drivingly connected to the left and right front tires 9R and 9L via the final reduction gear train 6, the differential gear 7, and the left and right drive shafts 8R and 8L.

  The first clutch 2, the motor / generator 3 and the second clutch 4 constitute a one-motor / two-clutch hybrid drive system, which has “EV mode” and “HEV mode” as main drive modes. The “EV mode” is an electric vehicle mode in which the first clutch 2 is released, the second clutch 4 is engaged, and only the motor / generator 3 is used as a drive source. The “HEV mode” is a hybrid vehicle mode in which both the clutches 2 and 4 are engaged and the engine 1 and the motor / generator 3 are used as driving sources.

  The first clutch 2 is a hydraulically operated friction clutch (wet multi-plate, dry single plate, dry multi-plate, etc.) interposed between the engine 1 and the motor / generator 4. Full engagement / slip engagement / release is controlled by the generated first clutch hydraulic pressure.

  The motor / generator 3 is a three-phase AC permanent magnet type synchronous motor connected to the engine 1 via a first clutch 2.

  The second clutch 4 is a hydraulically operated wet multi-plate friction clutch interposed between the motor / generator 3 and the left and right front wheel tires 9R, 9L. The second clutch 4 is created by a hydraulic circuit (not shown). Full engagement / slip engagement / release is controlled by clutch hydraulic pressure. The second clutch 5 uses the forward clutch and the reverse brake provided in the forward / reverse switching mechanism by the planetary gear of the belt-type continuously variable transmission 6 as the second clutch CL2 at the time of forward movement and reverse movement.

  The belt-type continuously variable transmission 5 is a transmission that obtains a continuously variable transmission ratio by changing the belt winding diameter by the transmission hydraulic pressure to the primary oil chamber and the secondary oil chamber. This belt-type continuously variable transmission 6 has a mechanical oil pump 10 that is rotationally driven by a motor shaft (= transmission input shaft) of the motor / generator 4.

  As shown in FIG. 1, the motor control system of the FF hybrid vehicle includes a battery 21, an inverter 22, a host controller 23, and a resolver 24.

  The inverter 22 converts the direct current from the battery 21 into a three-phase alternating current during power running and converts the three-phase alternating current into a direct current to the battery 21 during regeneration in the stator coil of the motor / generator 3. The battery 21 and the inverter 22 are connected via a DC harness 25, and the inverter 22 and the stator coil of the motor / generator 3 are connected via an AC harness 26.

  The host controller 23 is a controller that outputs a motor command torque to the inverter 22 in accordance with a command from a hybrid control module (not shown) responsible for appropriately managing the energy consumption of the entire vehicle. The resolver 24 detects a motor angle that is a rotor rotation angle. Hereinafter, a detailed configuration of the inverter 22 will be described.

  The inverter 22 includes a motor current feedback control circuit 221 (motor torque control means), a motor control system failure detection circuit 222 (motor control system failure detection means), a voltage sensor 223, a first current sensor 224, and a second And a current sensor 225.

  The motor current feedback control circuit 221 is a circuit that converts a direct current supplied from the battery 21 into a three-phase alternating current supplied to the motor based on a motor command torque from the host controller 23. The motor current feedback control circuit 221 includes a motor current command value calculation unit 221a, a current F / B control unit 221b, and a power element 221c.

  The motor current command value calculation unit 221a calculates a target motor current based on the motor command torque from the host controller 23 and the battery voltage from the voltage sensor 223, and calculates the target motor current as a current F / B control unit 221b. Output to.

  The current F / B control unit 221b includes a target motor current from the motor current command value calculation unit 221a, a motor current 1 from the first current sensor 224, a motor current 2 from the second current sensor 225, and a resolver 24. Enter the motor angle from. Then, the power element driving duty is calculated by current feedback control so that the motor actual current obtained from the motor current 1, the motor current 2, and the motor angle matches the target motor current. Then, the power element drive duty command value is output to the power element 221c.

  The power element 221c receives the power element drive duty command value from the current F / B control unit 221b, converts the direct current supplied from the battery 21 into a three-phase alternating current supplied to the motor, and supplies the AC harness 26 with the three-phase alternating current. The motor current is output.

  The motor control system failure detection circuit 222 calculates a deviation torque, which is an absolute value of the difference between the motor command torque and the motor current, and detects a failure of the motor control system based on the deviation torque. The motor control system failure detection circuit 222 includes a motor torque calculation unit 222a, a deviation torque calculation unit 222b, and a deviation failure determination unit 222c.

  The motor torque calculation unit 222a calculates the battery voltage from the voltage sensor 223, the motor current 1 from the first current sensor 224, the motor current 2 from the second current sensor 225, and the motor angle from the resolver 24. input. Then, the motor torque is estimated by calculation based on these pieces of information, and the motor torque is output to the deviation torque calculation unit 222b.

  The deviation torque calculation unit 222b calculates a deviation torque that is an absolute value of a difference between the motor command torque from the host controller 23 and the motor torque calculated by the motor torque calculation unit 222a, and converts the deviation torque into a deviation fault. The data is output to the determination unit 222c.

  The divergence failure determination unit 222c sets a plurality of combination conditions in which both the failure determination value of the divergence torque and the failure determination time for continuing the state exceeding the failure determination value are set, and among the plurality of failure determination conditions set If any one of the conditions is satisfied, it is determined that the motor torque deviation failure has occurred. In the first embodiment, the failure determination condition includes a combination condition 1 based on a predetermined value 1 and a predetermined time 1, and a combination condition 2 based on a predetermined value 2 smaller than the predetermined value 1 and a predetermined time 2 longer than the predetermined time 1. If any one of the combination conditions 1 and 2 is satisfied, it is determined that the motor torque deviation failure has occurred. If it is determined that the motor torque divergence failure is detected, a failure flag is output to the current F / B control unit 221b, and the drive of the motor / generator 3 is stopped until key-off occurs.

[Motor control system failure detection processing configuration]
FIG. 2 shows a motor control system failure detection processing flow (motor control system failure detection means) executed by the motor current feedback control circuit 221 and the motor control system failure detection circuit 222 included in the inverter 22 of the first embodiment. Hereinafter, each step of FIG. 2 representing the motor control system failure detection processing configuration will be described.

  In step S1, the motor torque calculator 222a calculates the motor torque based on the battery voltage, the motor current 1, the motor current 2, and the motor angle, and the process proceeds to step S2.

  In step S2, following the calculation of the motor torque in step S1, the divergence torque calculation unit 222b calculates a divergence torque that is the absolute value of the difference between the motor command torque and the motor torque, and proceeds to step S3. .

In step S3, following the calculation of the deviation torque in step S2, the deviation fault determination unit 222c determines whether or not the calculated deviation torque has continued for a predetermined time 1 or more for a predetermined time 1 or more. If Yes (combination condition 1 is satisfied), the process proceeds to step S7. If No (combination condition 1 is not satisfied), the process proceeds to step S4.
Here, as shown in FIG. 3, the divergence failure determination unit 222c sets the predetermined value 1 as a value of the divergence torque that easily gives the driver a sense of incongruity, and sets the predetermined time 1 as a short time that does not continue. ing.

In step S4, following the determination that the combination condition 1 in step S3 is not established, the divergence failure determination unit 222c determines whether or not the calculated divergence torque has continued for a predetermined time 2 or more for a predetermined value 2 or more. to decide. If Yes (combination condition 2 is satisfied), the process proceeds to step S7. If No (combination condition 2 is not satisfied), the process proceeds to step S5.
Here, as shown in FIG. 3, the divergence failure determination unit 222c sets the predetermined value 2 as a value of the divergence torque that does not give the driver a sense of incongruity, and sets the predetermined time 2 as a continuous long time. ing.

  In step S5, following the determination that the combination condition 2 in step S4 is not satisfied, the motor current command value calculation unit 221a calculates the target motor current based on the motor command torque and the battery voltage, and the process proceeds to step S6. .

  In step S6, following the calculation of the target motor current in step S5, the current F / B control unit 221b sets the power element drive duty to F / B based on the target motor current, motor current 1, motor current 2, and motor angle. calculate. Then, the power element drive duty command value is output to drive the power element 221c ON / OFF, and the process proceeds to step S8.

In step S7, the failure flag is turned on following the determination that the combination condition 1 is satisfied in step S3 or the combination condition 2 is satisfied in step S4, and the current F / B control unit The power element drive duty command value obtained in 221b is set to 0%. As a result, the drive of the power element 221c is stopped (fixed off), and the process proceeds to step S8.
It should be noted that after detecting a motor torque deviation failure and turning on the failure flag, the failure flag is kept on until key-off.

  In step S8, following the ON / OFF driving of the power element 221c in step S6 or the fixing of the power element 221c OFF in step S7, it is determined whether or not the key element is off. If Yes (key off), the process proceeds to the end. If No (key on), the process returns to step S1.

Next, the operation will be described.
The operation of the control device for the FF hybrid vehicle of the first embodiment will be described separately for “motor control system failure detection processing operation”, “motor torque deviation failure determination operation”, and “other characteristic operation”.

[Motor control system failure detection processing action]
Hereinafter, the motor control system failure detection processing operation will be described with reference to the flowchart of FIG.
When the combination conditions 1 and 2 for determining the motor torque divergence failure are not satisfied, the process proceeds to step S1, step S2, step S3, step S4, step S5, step S6, and step S8 in the flowchart of FIG. As long as it is determined that the key is turned on in step S8, the flow of step S1, step S2, step S3, step S4, step S5, step S6, and step S8 is repeated.
In step S5, the motor current command value calculation unit 221a calculates the target motor current based on the motor command torque and the battery voltage. In the next step S6, the current F / B control unit 221b calculates the power element driving duty based on the target motor current, the motor current 1, the motor current 2, and the motor angle. Then, by outputting the power element drive duty command value, the power element 221c is driven ON / OFF. That is, motor torque control is performed when the motor torque deviation failure is normal.

  On the other hand, when the combination condition 1 for determining the motor torque divergence failure is satisfied, the process proceeds from step S1, step S2, step S3, step S7, step S8 in the flowchart of FIG. In step S7, the failure flag is turned on, and the power element drive duty command value obtained by the current F / B control unit 221b is set to 0%. As a result, the driving of the power element 221c is stopped (fixed off). After detecting a motor torque deviation failure and turning on the failure flag, the failure flag on is maintained until key-off.

  On the other hand, the combination condition 1 for determining the motor torque divergence failure is not established. However, when the combination condition 2 is established, in the flowchart of FIG. 2, from step S1, step S2, step S3, step S4, step S7, step S8. move on. In step S7, the failure flag is turned on, and the power element drive duty command value obtained by the current F / B control unit 221b is set to 0%. As a result, the driving of the power element 221c is stopped (fixed off). After detecting a motor torque deviation failure and turning on the failure flag, the failure flag on is maintained until key-off.

  As described above, when one of the combination conditions 1 and 2 for determining the motor torque deviation failure is established, it is determined that the motor torque deviation failure is present. Then, based on the motor torque divergence failure determination, the failure flag is turned on, and the driving of the power element 221c is stopped (fixed off) until the key is turned off.

[Motor torque deviation failure judgment]
In the first embodiment, a plurality of combination conditions in which both the failure determination value of the deviation torque and the failure determination time for continuing the state exceeding the failure determination value are set as the failure determination conditions. The motor torque deviation failure is determined when any one of the plurality of failure determination conditions is satisfied (a plurality of condition points along the determination characteristic line in FIG. 3).
That is, by setting a plurality of combination conditions having different failure determination values and failure determination times, the degree of freedom in setting the failure determination conditions is increased. When utilizing this high degree of freedom of setting and dealing with a failure with a large deviation torque, for example, by making a combination condition in which the failure determination value is increased and the failure determination time is shortened, the uncomfortable feeling given to the driver can be suppressed. On the other hand, when dealing with a failure with a small deviation torque, for example, by making a combination condition in which the failure determination value is reduced and the failure determination time is increased, erroneous determination of a motor torque deviation failure can be suppressed.
As a result, when determining a motor torque divergence failure, it is possible to achieve both suppression of a sense of incongruity and suppression of erroneous determination.

In the first embodiment, when the failure determination value is a predetermined value and the failure determination time is a predetermined time, the failure determination condition is a combination condition 1 based on the predetermined value 1 and the predetermined time 1, a predetermined value 2 smaller than the predetermined value 1, and a predetermined value. Combination condition 2 with a predetermined time 2 longer than time 1. The motor torque divergence failure is determined when any one of the combination conditions 1 and 2 is satisfied (the condition point in the left region and the condition point in the right region in the determination characteristic line in FIG. 3).
That is, when a plurality of combination conditions are set, if two combination conditions are used, the determination configuration of the motor torque deviation failure is the simplest. However, if the two combination conditions are on the side where importance is given to handling a failure with a large deviation torque, even if the sense of incongruity can be suppressed, the erroneous determination may not be suppressed. On the other hand, if the two combination conditions are on the side of emphasizing failure handling with a small deviation torque, even if the erroneous determination can be suppressed, the sense of discomfort may not be suppressed.
On the other hand, two combination conditions 1 and 2 having an inversely proportional relationship of predetermined value 1> predetermined value 2 and predetermined time 1 <predetermined time 2 are set. In this case, the combination condition 1 is a condition for determining a failure with a large deviation torque, and the combination condition 2 is a condition for determining a failure with a small deviation torque. For this reason, the determination configuration of the motor torque deviation failure can be simplified.

In the first embodiment, the combination condition 1 is set to a condition in which the predetermined value 1 is a value of a deviation torque that easily gives the driver a sense of incongruity and the predetermined time 1 is a short time that is not continuous. On the other hand, the combination condition 2 is set to a condition in which the predetermined value 2 is set to a value of a deviation torque that does not give the driver a sense of incongruity, and the predetermined time 2 is set to a continuous long time (flat in the determination characteristic line of FIG. 3). Condition point of line part).
That is, in the case of “a failure where the difference between the motor command torque and the motor torque is large” that easily gives the driver a sense of incongruity, the driver is not given a sense of incongruity by detecting the failure at a predetermined time 1 that is a short time. In addition, in the case of “failure with a small difference between the motor command torque and the motor torque”, a failure may be detected when the failure is determined at a predetermined time 1 that is a short time, so the failure is detected at a predetermined time 2 that is a longer time. By doing so, false detection can be eliminated. At the same time, when the torque divergence is small, it takes a long time to give the driver a sense of incongruity, so both avoidance of incongruity and avoidance of erroneous detection of a failure can be achieved.

[Other features]
In the first embodiment, when the motor torque deviation failure is determined, the driving of the motor / generator 3 is stopped until key-off occurs.
That is, since the applied vehicle is a hybrid vehicle, traveling by the engine 1 can be ensured even if driving of the motor / generator 3 is stopped. And if it determines with a motor torque deviation failure, since the drive of the motor / generator 3 will be stopped, the battery 21 can be protected. In addition, the motor torque does not increase or decrease due to the motor torque deviation failure, and it is possible to prevent the driver from feeling uncomfortable.
Therefore, when it is determined that the motor torque divergence failure has occurred, the battery 21 can be protected while ensuring traveling by the engine 1, and prevention of a sense of incongruity due to increase or decrease in motor torque can be achieved.

In the first embodiment, an inverter 22 that converts a direct current supplied from the battery 21 into a three-phase alternating current supplied to the motor is connected to the motor / generator 3 based on the motor command torque from the host controller 23. The inverter 22 is provided with a motor current feedback control circuit 221 and a motor control system failure detection circuit 222.
That is, the motor control system failure detection circuit can be provided in the host controller 23 or the like included in the control system, or can be provided independently from the controller of the motor control system. However, when determining a motor torque deviation failure, motor command torque, motor current, battery voltage, and the like are necessary information. These pieces of information are necessary information for the motor current feedback control circuit 221 included in the inverter 22.
On the other hand, the inverter 22 is provided with a motor current feedback control circuit 221 and a motor control system failure detection circuit 222. Therefore, unnecessary sensor wiring can be eliminated, and stable necessary information without signal variation can be shared by the motor current feedback control circuit 221 and the motor control system failure detection circuit 222 provided in the inverter 22.

Next, the effect will be described.
In the control apparatus for the FF hybrid vehicle according to the first embodiment, the effects listed below can be obtained.

(1) In a control device for an electric vehicle (FF hybrid vehicle) having a motor (motor / generator 3) as a drive source,
Motor torque control means (motor current feedback control circuit 221) for controlling the motor current supplied to the motor (motor / generator 3) based on the motor command torque;
Motor control system failure detection means (motor control system failure detection circuit 222) for detecting a failure in the motor control system based on a deviation torque that is a difference between the motor torque obtained from the motor command torque and the motor current;
The motor control system failure detection means (motor control system failure detection circuit 222) has a failure determination value (predetermined values 1 and 2) of the divergence torque as a failure determination condition and a failure determination time for continuing the state exceeding the failure determination value. A plurality of combination conditions that are different from each other (predetermined times 1 and 2) are set, and if any one of the plurality of set failure determination conditions is satisfied, a motor torque deviation failure is determined (FIG. 1).
For this reason, when determining a motor torque deviation failure, it is possible to achieve both suppression of a sense of incongruity and suppression of erroneous determination.

(2) The motor control system failure detection means (motor control system failure detection circuit 222) uses a predetermined value 1 and a predetermined time 1 as failure determination conditions when the failure determination value is a predetermined value and the failure determination time is a predetermined time. A combination condition 1; a combination condition 2 with a predetermined value 2 smaller than a predetermined value 1 and a predetermined time 2 longer than a predetermined time 1; A failure is determined (FIG. 3).
For this reason, in addition to the effect of (1), the determination configuration of the motor torque deviation failure can be simplified when determining the motor torque deviation failure.

(3) The motor control system failure detection means (motor control system failure detection circuit 222) sets the combination condition 1 as a deviation torque value that easily gives the driver a sense of incongruity, and the predetermined time 1 does not continue for a short time. The combination condition 2 was set to a condition in which the predetermined value 2 is a value of a deviation torque that does not give the driver a sense of incongruity and the predetermined time 2 is a continuous long time (FIG. 3).
For this reason, in addition to the effect of (2), when determining a motor torque divergence failure, it is possible to achieve both avoidance of discomfort and avoidance of erroneous detection of the failure.

(4) The electric vehicle is a hybrid vehicle (FF hybrid vehicle) having an engine 1 and a motor (motor / generator 3) as drive sources,
If it is determined by the motor control system failure detection means (motor control system failure detection circuit 222) that the motor torque deviation has failed, the drive of the motor (motor / generator 3) is stopped until key-off occurs (FIG. 2).
For this reason, in addition to the effects (1) to (3), when it is determined that the motor torque divergence has failed, the battery 21 can be protected while ensuring the traveling by the engine 1, and the uncomfortable feeling due to the increase or decrease in the motor torque can be prevented. Can be achieved.

(5) An inverter 22 that converts a direct current supplied from the battery 21 into a three-phase alternating current supplied to the motor based on the motor command torque from the host controller 23 is connected to the motor (motor / generator 3).
The inverter 22 is provided with a motor current feedback control circuit 221 which is a motor torque control means and a motor control system failure detection circuit 222 which is a motor control system failure detection means (FIG. 1).
For this reason, in addition to the effects of (1) to (4), unnecessary sensor wiring can be eliminated, and stable necessary information without signal variation can be obtained from the motor current feedback control circuit 221 provided in the inverter 22 and the motor control system failure. It can be shared by the detection circuit 222.

  As mentioned above, although the control apparatus of the electric vehicle of this invention has been demonstrated based on Example 1, it is not restricted to this Example 1 about a concrete structure, The invention which concerns on each claim of a claim Design changes and additions are permitted without departing from the gist of the present invention.

  In the first embodiment, as the divergence failure determination unit 222c, the combination condition 1 based on the predetermined value 1 and the predetermined time 1 and the combination condition 2 based on the predetermined value 2 smaller than the predetermined value 1 and the predetermined time 2 longer than the predetermined time 1 are used. In this example, the motor torque deviation failure is determined. However, the divergence failure determination unit may increase the combination condition of the predetermined value and the predetermined time to 3 or more as necessary. For example, when the combination condition is increased by one, in addition to the combination condition 1 and the combination condition 2, a predetermined value 3 (predetermined value 2 <predetermined value 3 <predetermined value 1) and a predetermined time 3 (existing on the inverse proportional characteristic line in FIG. The combination condition 3 is added according to the predetermined time 1 <predetermined time 3 <predetermined time 2).

  In the first embodiment, the divergence failure determination unit 222c has been described as an example of a fail-safe measure by stopping the driving of the motor / generator 3 until a key-off occurs when it is determined that the motor torque divergence failure occurs. However, if it is determined that the motor torque divergence failure is detected, the divergence failure determination unit increases the distribution ratio between the engine torque and the motor torque with respect to the required driving force, increases the engine torque distribution ratio, and decreases the motor torque distribution ratio. It is good also as an example made into a fail safe measure.

  In the first embodiment, the inverter 22 is provided with a motor current feedback control circuit 221 that is a motor torque control means and a motor control system failure detection circuit 222 that is a motor control system failure detection means. However, a motor control system failure detection circuit that is a motor control system failure detection means may be provided in the host controller, or may be provided independently from the controller included in the existing control system.

  In Example 1, the example which applies the control apparatus of the electric vehicle of this invention to FF hybrid vehicle was shown. However, the control device of the present invention can be applied to FR hybrid vehicles and other types of hybrid vehicles, and can also be applied to electric vehicles and fuel cell vehicles. In short, any electric vehicle having a motor as a drive source can be applied.

1 Engine 2 First clutch 3 Motor / generator (motor)
4 Second clutch 5 Belt type continuously variable transmission 6 Final reduction gear train 7 Differential gears 8R, 8L Left and right drive shafts 9R, 9L Left and right front tires 21 Battery 22 Inverter
221 Motor current feedback control circuit (motor torque control means)
222 Motor control system failure detection circuit (motor control system failure detection means)
222a Motor torque calculator
222b Deviation torque calculator
222c Deviation fault judgment unit
223 Voltage sensor
224 First current sensor
225 Second current sensor 23 Host controller 24 Resolver

Claims (5)

In a control device for an electric vehicle having a motor as a drive source,
Motor torque control means for controlling the motor current supplied to the motor based on a motor command torque;
Motor control system failure detection means for detecting a failure of the motor control system based on a deviation torque which is a difference between the motor command torque and the motor torque obtained from the motor current;
The motor control system failure detection means sets a plurality of combination conditions in which both the failure determination value of the deviation torque and the failure determination time for continuing the state exceeding the failure determination value are different as failure determination conditions, A control device for an electric vehicle, characterized in that a motor torque deviation failure is determined when any one of a plurality of failure determination conditions is satisfied. In the control device of the electric vehicle according to claim 1,
When the failure determination value is a predetermined value and the failure determination time is a predetermined time, the motor control system failure detection means uses a combination condition 1 based on a predetermined value 1 and a predetermined time 1 as a failure determination condition, and a predetermined value 1 A combination condition 2 having a small predetermined value 2 and a predetermined time 2 longer than a predetermined time 1, and when any one of the combination conditions 1 and 2 is satisfied, it is determined that a motor torque divergence failure has occurred. A control device for an electric vehicle. In the control apparatus of the electric vehicle according to claim 2,
The motor control system failure detection means sets the combination condition 1 to a condition in which the predetermined value 1 is set to a value of a deviation torque that easily gives a driver a sense of incongruity, and the predetermined time 1 is set to a short time that is not continuous, The combination condition 2 is set to a condition in which the predetermined value 2 is a value of a deviation torque that does not give the driver a sense of incongruity, and the predetermined time 2 is a continuous long time. In the control apparatus of the electric vehicle as described in any one of Claim 1- Claim 3,
The electric vehicle is a hybrid vehicle having an engine and a motor as drive sources,
When the motor control system failure detection means determines that a motor torque deviation failure has occurred, the drive of the motor is stopped until a key-off occurs. In the control apparatus of the electric vehicle as described in any one of Claim 1- Claim 4,
Based on the motor command torque from the host controller, the motor is connected to an inverter that converts direct current supplied from the battery into three-phase alternating current supplied to the motor,
A control apparatus for an electric vehicle, characterized in that a motor current feedback control circuit as the motor torque control means and a motor control system failure detection circuit as the motor control system failure detection means are provided in the inverter.