JP2002374678A - Power controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power controller, capable of executing a suitable fail safe against various kinds of faults and avoiding a fault in association with execution of a fail/safe not suitable as coping with the fault. SOLUTION: The power controller comprises an output line 31 of an M/G 16, a high-power line HL connected to a high voltage terminal of a high-voltage battery 20 and a low voltage power line LL connected to its low-voltage terminal which are wired via a rectifier element 32 and a switching element 33, connected in parallel in a power module 26. At a fault during the operation of the M/G 16, the first fail safe for holding the element 33 off and the second fail safe for stopping a power supply to an exciting coil 24 of the rotor of the M/G 16 are executed suitably, in response to the cause of its fault.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power control device for an AC rotary electric machine functioning as a motor or a generator.

[0002]

2. Description of the Related Art In recent years, in vehicles such as automobiles, a winding field type three-phase AC rotating electric machine is mounted on a motor generator (M
/ G) has been put to practical use. In such a vehicle, the three-phase AC rotary electric machine and the battery are connected via an inverter circuit.

When the three-phase AC rotary electric machine is caused to function as an electric motor, while the power is supplied to the excitation coil of the rotor of the rotary electric machine through the inverter circuit, the on / off of the switching element of the circuit is performed. The DC operation stored in the battery is converted into three-phase AC power by controlling the phase of the OFF operation, and power is supplied to the U-phase, V-phase, and W-phase armature coils in the rotary electric machine.

When the three-phase AC rotating electric machine is functioning as a generator, the generated AC electricity is converted into DC electricity by controlling the phase of the on / off operation of the switching element of the inverter circuit. Store in battery. At this time, the amount of power generation is adjusted by adjusting the applied voltage to the excitation coil of the rotor of the three-phase AC rotary electric machine.

[0005]

By the way, in the above-mentioned inverter circuit, some abnormalities, for example, various abnormalities such as overcurrent, overvoltage, and power supply voltage drop may occur. In such abnormalities, the switching element is turned off as fail-safe. It is also conceivable to keep the state. However, if a single fail-safe operation in which the switching element is always kept off for various types of abnormalities is performed, depending on the cause of the abnormality, the fail-safe may not be appropriate as a measure for the abnormality. It is also necessary to take countermeasures below.

The present invention has been made in view of such circumstances, and an object thereof is to execute an appropriate fail-safe against various types of abnormalities, and to execute an inappropriate fail-safe as a measure against the abnormalities. It is an object of the present invention to provide a power control device capable of avoiding the accompanying problems.

[0007]

The means for achieving the above object and the effects thereof will be described below. In order to achieve the above object, according to the first aspect of the present invention, an output line of an AC rotating electric machine and a DC electric circuit are connected via a switching element and a rectifying element connected in parallel, and the switching element is turned on / off. In the power control device for performing the operation and supplying power to the excitation coil of the rotor of the AC rotary electric machine, when an abnormality occurs, a first fail-safe that holds the switching element in an off state, and a power supply to the excitation coil. There is provided a control means for appropriately executing the second failsafe for stopping the power supply in accordance with the cause of the abnormality.

According to the above configuration, when an abnormality occurs, one or both of the first and second fail-safes are appropriately executed in accordance with the cause, so that an appropriate fail-safe for various types of abnormalities is provided. Can be performed. Therefore, it is possible to avoid a problem caused by execution of an inappropriate fail-safe as a countermeasure for the abnormality.

According to a second aspect of the present invention, in the first aspect of the present invention, when the AC rotary electric machine is in an abnormal state while functioning as a generator, the control means is configured to perform the second operation in accordance with a cause of the abnormality. At least one of the first fail-safe and the second fail-safe is appropriately executed.

According to the above configuration, when an abnormality occurs while the AC rotary electric machine functions as a generator, one or both of the first and second fail-safes are appropriately executed according to the cause. Thus, appropriate fail-safe can be executed for various abnormalities. Therefore, it is possible to avoid a problem caused by execution of an inappropriate fail-safe as a countermeasure for the abnormality.

According to the third aspect of the present invention, the first or second aspect is provided.
In the invention described above, the control means switches between execution of only the first fail-safe and execution of both the first and second fail-safes according to the cause of the abnormality.

According to the above configuration, when an abnormality occurs, one or both of the first and second fail-safes are appropriately executed in accordance with the cause, so that an appropriate fail-safe for various types of abnormalities is provided. Can be performed. Therefore, it is possible to avoid a problem caused by execution of an inappropriate fail-safe as a countermeasure for the abnormality.

When only the first fail-safe is executed and the switching element is kept off when the AC rotating electric machine is functioning as a generator, the AC-DC conversion of the generated AC electricity is performed. Is performed only by the rectifying action of the rectifying element. Further, when the second fail-safe is executed and power supply to the excitation coil of the rotor of the AC rotary electric machine is stopped, power generation by the rotary electric machine is stopped. Therefore, by switching the execution of the fail-safe as described above according to the cause of the abnormality so that the occurrence of the abnormality during power generation can be dealt with only by performing the first fail-safe as much as possible, the efficiency can be improved. Power can be generated.

According to a fourth aspect of the present invention, in the third aspect of the invention, when the abnormality occurs in a state where the AC rotary electric machine functions as a generator, the control means may perform the power generation even if the abnormality occurs. Only the first fail-safe is executed on condition that the type is of a type that does not cause any trouble.

According to the above configuration, it is possible to appropriately cope with an abnormality only by executing the first failsafe as much as possible. In the invention according to claim 5, claim 3
In the invention according to the fourth aspect, the control means may be configured such that, when an abnormality occurs in a state where the AC rotary electric machine functions as a generator, the abnormality is of a type that hinders generation of power. In addition, both the first and second fail safes are executed.

According to the above configuration, when an abnormality that cannot be dealt with only by the first fail safe occurs, the abnormality is dealt with by both the first and second fail safes immediately. Appropriate measures will be taken for abnormalities.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the control means continues the abnormality even after executing only the first failsafe for a predetermined period. , The second fail-safe is executed.

According to the above configuration, when an abnormality occurs in a state in which the AC rotary electric machine functions as a generator, the first measure against the abnormality is an abnormality measure capable of generating power when possible. Fail safe is executed. Then, on condition that the above abnormality is continued for a predetermined time or a predetermined number of times in a state where the first failsafe is executed, a second failsafe which is a measure against the abnormality accompanied by the stop of the power generation is executed. Therefore, when an abnormality occurs during power generation, efficient power generation can be achieved by coping with the abnormality only by executing the first fail-safe as much as possible.
If the execution of the fail-safe alone does not provide an appropriate countermeasure, the second fail-safe is further executed,
As a result, appropriate countermeasures are taken.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS.

As shown in FIG. 1, an internal combustion engine (ENG) 10 mounted on a vehicle such as an automobile has an automatic transmission (A / A /
T) 11 to transmit power to drive wheels (not shown) through the automatic transmission 11.

Around the internal combustion engine 10, a compressor 13 for an air conditioner (A / C), a power steering (P / S) pump 14, and a water pump (W /
P) 15 etc., and a motor generator (M /
G) 16 are arranged. A crankshaft 10a, which is an output shaft of the internal combustion engine 10, and each of these accessories 13 to
The drive belt 15 and the M / G 16 are drivingly connected to each other through a transmission belt 17. An electromagnetic clutch 18 is provided between the crankshaft 10a and the power transmission belt 17, and power transmission between the crankshaft 10a and the power transmission belt 17 is interrupted in accordance with control of energization of the clutch 18. Is to be touched.

The M / G 16 is connected to a high voltage (36 V) and a low voltage (12 V) via a power control unit 19.
Are electrically connected to the two batteries 20 and 21, and the operation is controlled through the power control unit 19.

Next, the control system for the vehicle will be described. This control system is configured around an engine control unit (ECU) 22.
The ECU 22 performs various controls of the internal combustion engine 10 based on output signals from various sensors that detect the state of the internal combustion engine 10 and the vehicle, and also controls energization of the clutch 18 and the like. Further, the ECU 22 outputs the command signal to the power control unit 19 to output the M / M
The operation control of G16 is also performed.

In this vehicle, when it is not necessary to operate the internal combustion engine 10, such as when the brake pedal is depressed and there is no possibility of self-running, control for temporarily stopping the operation of the internal combustion engine 10 is performed. When the ECU 22 detects that the vehicle is temporarily stopped, the ECU 22 disconnects the clutch 18 to disconnect the connection between the crankshaft 10a and the transmission belt 17, and then stops the internal combustion engine 10. And
The ECU 22 operates the M / G 16 as an electric motor with the electric power stored in the high-voltage battery 20, and operates the auxiliary machines 13 to 15 with the power. As a result, even when the internal combustion engine 10 is stopped, the operation of each of the auxiliary devices 13 to 15 is maintained.

Further, while the internal combustion engine 10 is stopped,
When it is determined that there is a possibility that the vehicle is self-propelled based on the brake pedal being depressed in the D range or the shift operation being performed from the P and N ranges, the ECU is activated.
Reference numeral 22 connects the clutch 18, and rotates the crankshaft 10a by the M / G 16. And the internal combustion engine 1
When the rotation speed of 0 reaches a predetermined rotation speed, firing is started and the internal combustion engine 10 is restarted. Therefore,
When the internal combustion engine 10 is restarted from the temporary stop, M / G1
6 plays a role as a starter motor.

Thereafter, when the internal combustion engine 10 stably operates independently, the operation of the M / G 16 as an electric motor is stopped, and the auxiliary machines 13 to 15 are driven by the power of the internal combustion engine 10. The M / G 16 at this time is driven by the power of the internal combustion engine 10 and functions as a generator. As described above, the M / G 16 functions as a motor that generates power by supplying power from the high-voltage battery 20 or as a generator that generates power by transmitting power from the transmission belt 17.

Next, an electrical configuration related to the operation of the M / G 16 will be described in further detail with reference to FIG. As shown in FIG. 2, the M / G 16 includes an excitation coil 24 wound around a rotor that is drivingly connected to a transmission belt 17 (FIG. 1), and a U-phase and a V-phase disposed on a stator.
It is configured as a three-phase AC rotary electric machine of a winding field type having a three-phase and a W-phase armature coil 25. The power control unit 19 includes a power module 26,
Power module drive circuit 27, excitation drive circuit 28, M
/ G controller 29, DC-DC converter 30, power supply circuit 36, and the like.

The power supply to the excitation coil 24 of the M / G 16 rotor and the adjustment of the applied voltage are performed by an excitation drive circuit 28. Further, the output line 31 of the armature coil 25 of each phase provided on the stator of the M / G 16 is connected to the high power supply line HL connected to the high terminal of the high voltage battery 20 via the power module 26 and the low power line HL. It is connected to the lower power supply line LL connected to the side terminal. The power module 26 includes each output line 31 and both power lines H
L and LL are each configured as a three-phase bridge circuit connected via a rectifying element 32 and a switching element 33 connected in parallel. Here, a diode is used as the rectifying element 32, and a field effect transistor (FET) is used as the switching element 33.

The power module 26 has an M / G
When operating the motor 16 as an electric motor, the motor 16 operates as an inverter circuit that converts the electric power stored in the high-voltage battery 20 from DC to AC and supplies power to the armature coil 25. When the M / G 16 is operated as a generator, the power module 26 converts the AC power output from the armature coil 25 by power generation into AC-DC power and supplies power to the higher and lower power supply lines HL and LL (rectifier). ) Operates as a circuit. Such power module 2
The on / off operation of the switching element 33 according to the operation of No. 6 is operated by the power module drive circuit 27.

The high power supply line HL and the low power supply line LL are connected to a DC-DC converter 30. The DC-DC converter 30 includes two power lines HL,
The high voltage (36 V) supplied through the LL is changed to the low voltage (1
2V) to supply power to the low-voltage battery 21 and each controller.

On the other hand, the M / G controller 29
A magnetic pole sensor 34 for detecting the rotor position of G16 and a current sensor 35 for detecting the current of the output line 31 of each armature coil 25 are connected. The M / G controller 29 controls the operation of the power module drive circuit 27 and the excitation drive circuit 28 based on the command signal from the ECU 22 and the detection results of the sensors 34 and 35.

Power for operating the M / G controller 29, the power module drive circuit 27, and the excitation drive circuit 28 is supplied through a power supply circuit 36.
Next, a procedure (fail-safe) for dealing with an abnormality when the M / G 16 functions as a motor or a generator will be described with reference to a flowchart of FIG. 3 showing a fail-safe routine. This fail-safe routine is executed periodically, for example, by interruption every predetermined time.

In the present embodiment, as a countermeasure for the occurrence of the above-described abnormality, a first fail-safe in which the switching element 33 is kept in an off state and a second fail-safe in which the power supply to the exciting coil 24 of the rotor of the M / G 16 is stopped. Fail-safe is appropriately executed according to the cause of the abnormality.

When the M / G 16 functions as a generator, the AC-DC conversion of the generated AC electricity may be performed through phase control of the ON / OFF operation of the switching element 33 (hereinafter referred to as control rectification mode). ). As a countermeasure for the occurrence of an abnormality in such a state, execution of only the first fail-safe and execution of both the first and second fail-safes are selectively used depending on the type of the abnormality.

When both the first and second fail-safe operations are executed, the exciting coil 2 of the M / G 16 rotor
Since the power supply to 4 is stopped, the power generation is also stopped.
On the other hand, when only the first fail-safe is executed, the switching element 33 is kept in the off state, but power is supplied to the exciting coil 24, so that the power generation is continued. The AC-DC conversion of the generated AC electricity is performed only by the rectifying action of the rectifying element 32 (hereinafter, referred to as an uncontrolled rectifying mode).

Therefore, an abnormality occurs when the M / G 16 is functioning as a generator, and the abnormality causes a problem by generating electric power, for example, [1] power as shown below. There are abnormalities such as a decrease in drive power of the module drive circuit 27, the excitation drive circuit 28, and the M / G controller 29, [2] an overcurrent abnormality in the excitation drive circuit 28, and [3] an overvoltage abnormality in the high power supply line HL. In such a case, both the first and second failsafes are performed. As a result, the power generation is stopped, and the trouble caused by the abnormality described above is avoided. Also, M / G1
Even when an abnormality occurs while the motor 6 is functioning as a motor, both the first and second fail-safes are executed to cope with the abnormality, and the operation of the M / G 16 as the motor is stopped.

On the other hand, when the M / G 16 functions as a generator, an abnormality occurs, and the abnormality is likely to cause no problem even when the power is generated, for example, as shown below. [4] An abnormality such as an overcurrent abnormality in the U-phase, V-phase, and W-phase output lines 31 and [5] an abnormality in the power module 26 such as a functional failure related to the on / off operation of the switching element 33. First, only the first failsafe is executed. At this time, the power generation is switched from the power generation using the controlled rectification mode to the power generation using the non-controlled rectification mode, so that the power generation can be continued while avoiding the trouble due to the abnormality. In addition, power generation for battery storage and the like can be made efficient.

However, the execution of the first fail-safe alone is not appropriate as a countermeasure for the above-described abnormality. For example, if the abnormality continues even after the first fail-safe is executed, the second fail-safe is also executed. It is executed and power generation is stopped. By performing both the first and second fail-safes in this way, the trouble associated with the above-described abnormality can be accurately avoided.

In the fail-safe routine, M is a condition for executing both the first and second fail-safes.
It is determined whether the / G stop condition is satisfied (S101). Here, for example, when at least one abnormality among the above [1] to [3] has occurred, M /
It is determined that the G stop condition is satisfied, and an affirmative determination is made (S101: YES). When an affirmative determination is made in this manner, both the first and second failsafes are executed (S102, S103), and the generator operation or motor operation of the M / G 16 is stopped.

On the other hand, when a negative determination is made in step S101 and it is determined that the M / G stop condition is not satisfied, it is determined whether the power generation continuation condition for executing only the first fail-safe is satisfied. Is determined (S104). Here, for example, when at least one of the abnormalities [4] and [5] has occurred, it is determined that the power generation continuation condition is satisfied, and an affirmative determination is made (S104: YES). When an affirmative determination is made in this way, only the first failsafe is executed (S10).
5) Power generation is performed using the non-controlled rectification mode.

Subsequently, it is determined whether or not the abnormality continues even after a lapse of a predetermined time in a state where only the first failsafe is executed (S106). Here, if a negative determination is made, execution of only the first failsafe is continued, and power generation is continuously performed using the non-control rectification mode. On the other hand, if the determination is affirmative, the second failsafe is executed in addition to the first failsafe (S103). As a result, both the first and second fail safes are executed, and the power generation operation of the M / G 16 is stopped.

As a specific example of step S106, for example, the abnormal continuation time from when the first failsafe is started is measured, and when the measured time is equal to or longer than a predetermined time, it is determined that the continuation is abnormal. (Affirmative determination) may be performed. Further, as another specific example of step S106, it is determined whether or not the abnormality is present at regular time intervals after the first failsafe is started. When the count value (number of times of abnormality detection) of the counter is equal to or more than a predetermined value after a lapse of a predetermined time from the start of the first fail-safe, it is determined that the abnormality continues (a positive determination). It is also conceivable to do so.

According to the above-described embodiment, the following effects can be obtained. (1) When an abnormality occurs while the M / G 16 is functioning as an electric motor or a generator, execution of only the first fail-safe and execution of both the first and second fail-safes as measures against the abnormality And are switched according to the cause of the abnormality. Therefore, it is possible to execute appropriate fail-safe for various types of abnormalities, and to avoid a problem caused by executing an inappropriate fail-safe as a measure for the abnormalities.

(2) When the abnormality that occurs when the M / G 16 is functioning as a generator is of a type that is not likely to cause a problem due to power generation, the first abnormality is dealt with as the first abnormality countermeasure. Only fail-safe operation is performed, and power generation is performed in a state using the uncontrolled rectification mode as much as possible. Therefore, it is possible to efficiently perform power generation for battery power storage and the like. Further, if the abnormality cannot be dealt with by executing only the first fail-safe and the abnormality continues after executing the first fail-safe for a predetermined time, the second fail-safe is also activated. It is executed and power generation is stopped. Thus the first
By executing both the second fail-safe and the second fail-safe, it is possible to appropriately avoid troubles associated with abnormalities that cannot be dealt with only by the first fail-safe.

(3) If the abnormality that occurs when the M / G 16 is functioning as a generator is of a type that causes a problem with power generation, both the first and second fail-safes are immediately executed. As a result, the power generation is stopped, so that the problems associated with the above-described abnormalities can be accurately avoided.

The above embodiment can be modified, for example, as follows. Although a diode is used as the rectifying element 32 and an FET is used as the switching element 33, these may be changed to any elements having a rectifying function or a switching function.

In the above embodiment, the power module 2
6 is configured as a full-wave rectifier circuit, and only one of the high-order power supply line HL and the low-order power supply line LL is connected to the output line 31 via the switching element 33 and the rectification element 32 as a half-wave rectifier circuit. You may comprise.

In the above embodiment, the execution of only the first fail-safe and the execution of the first and second fail-safes are performed according to the cause of the abnormality.
Is switched to the execution of only fail-safe, but the present invention is not limited to this. For example, depending on the cause of the abnormality,
Switching between execution of only the first fail-safe, execution of only the second fail-safe, and execution of both the first and second fail-safes is also conceivable.

The switching of such an abnormal measure may be limited to only the time of power generation. -In the said embodiment, M / G16 is used as an AC rotary electric machine.
And the present invention is applied to this, but the present invention may be applied to an AC rotating electric machine that operates only as a generator.

Next, the technical ideas that can be grasped from the above embodiments will be described below together with their effects. (1) An output line of an AC rotating electric machine is connected to a DC electric circuit via a switching element and a rectifying element connected in parallel, and the AC electricity generated by the AC rotating electric machine is converted from AC to DC to DC. Powering the electrical circuit,
In a power control device that adjusts a power generation amount by applying an applied voltage to an excitation coil of a rotor of the AC rotating electric machine, a first fail-safe that holds the switching element in an off state when an abnormality occurs, and a power supply to the excitation coil A power control device comprising: a control unit that appropriately executes a second fail-safe for stopping the operation in accordance with the cause of the abnormality.

According to the above configuration, the same effect as that of the second aspect can be obtained. (2) In the power control device according to the above (1), the control means may execute both the first fail-safe only and the first and second fail-safes in accordance with the cause of the abnormality. And a power control device for switching the execution of the power control.

According to the above configuration, the same effect as that of the third aspect can be obtained. (3) In the power control device according to the above (2), the control unit may be configured such that, when an abnormality occurs, the abnormality is of a type that does not cause a problem even when the abnormality is generated. Power control device that executes only fail-safe.

According to the above configuration, the same effect as that of the fourth aspect can be obtained. (4) In the power control device according to the above (2) or (3), the control means may be of a type in which, when an abnormality occurs, the abnormality is of a type that causes a problem by performing power generation. A power control device that performs both the first and second fail safes.

According to the above configuration, the same effect as that of the fifth aspect can be obtained. (5) In the power control device according to any one of (1) to (4), the control unit may determine that the abnormality continues even after executing only the first failsafe for a predetermined period. A power control device that executes the second fail-safe on condition.

According to the above configuration, the same effect as that of the invention described in claim 6 can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of a drive system of a vehicle according to an embodiment.

FIG. 2 is an exemplary diagram showing an electrical configuration of an M / G drive control system according to the embodiment;

FIG. 3 is a flowchart showing a procedure for handling when an abnormality occurs during the operation of the M / G.

[Explanation of symbols]

16 motor generator (M / G), 19 power control unit, 20, 21 battery, 22 engine control unit (ECU), 24 excitation coil, 25 armature coil, 26 power module,
27: power module driving circuit, 28: excitation driving circuit, 29: M / G controller, 30: DC-DC converter, 32: rectifying element, 33: switching element, 3
4 magnetic pole sensor, 35 current sensor, 36 power supply circuit.

Continued on the front page F term (reference) 5H006 AA04 AA05 CA02 CA07 CA12 CA13 CB01 CB08 CC05 DA02 DB07 DC02 DC07 FA01 FA02 FA04 GA04 HA05 5H590 AA01 AB01 AB02 CA07 CA23 CC18 CC24 CD01 DD25 EA01 EA05 EA10 FA01 FA03 FA06 FA08 FC02 GB05 HA05 JB01

Claims (6)

[Claims] An AC rotary electric machine is connected to an output line of an AC rotary electric machine and a DC electric circuit via a switching element and a rectifying element connected in parallel to perform on / off operation of the switching element. A power control device for supplying power to the exciting coil of the rotor, wherein a first fail-safe that holds the switching element in an off state and a second fail-safe that stops supplying power to the exciting coil when an abnormality occurs. A power control device for appropriately executing the control according to the cause of the abnormality. 2. The control device according to claim 1, wherein when the AC rotary electric machine functions as a generator, when the AC rotary electric machine is abnormal, at least one of the first fail-safe and the second fail-safe is determined according to a cause of the abnormality. The power control apparatus according to claim 1, wherein one of the power control apparatuses is appropriately executed. 3. The control device according to claim 2, wherein the control means executes only the first failsafe, and executes the first failsafe in accordance with a cause of the abnormality.
The power control device according to claim 1, wherein the power control device switches between execution of the second failsafe and execution of both. 4. The control means is of a type which is highly likely not to cause a problem even if the abnormality is generated when an abnormality occurs while the AC rotary electric machine functions as a generator. 4. The power control apparatus according to claim 3, wherein only the first fail-safe is executed on the condition that: 5. The control means according to claim 1, wherein, when an abnormality occurs in a state in which the AC rotary electric machine functions as a generator, the abnormality is of a type that causes a problem by generating power. The power control device according to claim 3, wherein both the first and second fail-safe operations are performed. 6. The control system according to claim 1, wherein said control means executes said second fail-safe on condition that said abnormality continues even after executing only said first fail-safe for a predetermined period. The power control device according to any one of the above.