JP2009248707A - Rotary electrical machine control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further extend a save travelling distance when abnormality occurs in one of two rotary electrical machines in a rotary electrical machine control system. <P>SOLUTION: The rotary electrical machine control system 10 includes: a first resolver 22, a second resolver 24, two R/D converters 72, 74 for converting detection results of two resolvers to rotation angle information, a selector unit 70 for each selecting each connection destination of two R/D converters 72, 74 between the first resolver 22 or the second resolver 24, and a CPU 66 for continuing vehicle cruise by controlling an operation of a first rotary electric machine 12 or a second rotary electric machine 14 using a remaining normal R/D converter when any one of the two R/D converters are failed and for alternately switching modes between a control mode of cruising by an engine 6 and a control mode of cruising by the second rotary electric machine 14 in response to a charged state of a high voltage power source unit 40. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine control system, and in particular, controls a first rotating electrical machine that is connected to an engine and can generate power to charge a power storage device, and a second rotating electrical machine that is connected to the power storage device and can drive a vehicle. The present invention relates to a rotating electrical machine control system.

  In a vehicle including an engine and two rotating electrical machines, when an abnormality occurs in the control of either one of the two rotating electrical machines, control for retracting the vehicle to a safe place is performed. This control is sometimes called limp home control.

  For example, Patent Document 1 discloses a configuration in which a resolver, a current sensor, and their power supply circuits are separately provided in MG1 and MG2, respectively, in a vehicle including an engine, a traveling motor MG2, and a power generation motor MG1. Yes. When the power supply circuit 1 for the MG1 resolver or the like breaks down, the engine is stopped, the inverter drive of the MG1 is stopped, the MG2 inverter drive performs limp home (retreat travel), and the MG2 resolver drive It is described that when the power supply circuit 2 fails, the inverter drive of MG2 is stopped, the engine is started by driving the inverter of MG1, and limp home (retreat travel) is performed by the engine.

  Further, in Patent Document 2, in a vehicle including an engine, a traveling motor MG2, and a power generation motor MG1, when an abnormality occurs in MG2, the operation of MG2 is stopped and the reaction force from MG1 is received from the engine. A configuration is disclosed in which the battery is not overcharged in the direct running mode in which the engine and MG1 are driven and controlled so that power is transmitted to the ring gear shaft through the power distribution and integration mechanism. Here, when the accelerator pedal is turned on in the straight traveling mode, a small torque is set as the required torque regardless of the opening degree, and a torque commensurate with the torque command to be output from MG1 calculated from the required torque is output from MG1. It is stated that the target engine speed is set so that the engine speed is as small as possible among the engine speeds at which the engine does not stall. In addition, it is described that the power generated by MG1 is consumed using a compressor, a headlight, a room light, etc. of an air conditioner while maintaining the target rotational speed.

JP 2007-244126 A JP 2006-14386 A

  According to Patent Document 1, it is described that when one of two power supply circuits used for two resolvers breaks down, the inverter drive corresponding to the failed one is stopped and retreat travel is performed. . According to Patent Document 2, when an abnormality occurs in the traveling motor MG2, when the MG2 stops operating and travels in the direct traveling mode by the engine, the engine speed is set to such an extent that the battery is not overcharged. It is described that power generated by the power generation motor MG1 is consumed by a compressor of an air conditioner and the like.

  By using the method of Patent Document 2, the evacuation travel distance when the rotating electrical machine is abnormal can be somewhat extended. However, since there is a limit to the power that can be consumed by the compressor of the air conditioner, there is a limit to the extension of the evacuation distance.

  An object of the present invention is to provide a rotating electrical machine control system that can further extend the retreat travel distance when an abnormality occurs in one of two rotating electrical machines.

  A rotating electrical machine control system according to the present invention includes a first detection unit that detects a rotation angle of a first rotating electrical machine that is connected to an engine and generates power to charge the power storage device, and is connected to the power storage device to drive a vehicle. A second detection unit that detects the rotation angle of the two-rotary electric machine and two rotation angle information conversion units, wherein one of the detection results of the first detection unit or the second detection unit is converted into one rotation angle information conversion unit. Each of the two rotation angle information conversion units and the two rotation angle information conversion units for converting the other detection result into the other rotation angle information by the other rotation angle information conversion unit. Control of the operation of the first rotating electrical machine and the operation of the second rotating electrical machine based on the output of the switching unit capable of switching the connection destination between the first detection unit or the second detection unit and the output of the rotation angle information conversion unit. A control unit for performing, The control unit controls the operation of the first rotating electric machine or the second rotating electric machine using one normal rotation angle information conversion unit remaining when any one of the two rotation angle information conversion units breaks down, so that the vehicle travels. A control mode between a straight traveling control mode in which the vehicle travels with the engine and a rotating electrical machine traveling control mode in which the vehicle travels with the second rotating electrical machine by switching at the switching unit according to the continuous failure time traveling means and the charging state of the power storage device. And alternate switching means for alternately switching between.

  Further, in the rotating electrical machine control system according to the present invention, the alternate switching unit is configured to use the connection destination of the normal rotation angle information conversion unit as the first detection unit when the state of charge of the power storage device has decreased to a predetermined lower limit threshold. In the direct running control mode in which the power storage device is charged by power generation by the first rotating electrical machine and the state of charge of the power storage device rises to a predetermined upper limit threshold, the connection destination of the normal rotation angle information conversion unit is set to the second It is preferable that the control mode is alternately switched as a rotating electrical machine traveling control mode in which the detection unit receives power supplied from the power storage device and travels by the second rotating electrical machine.

  In the rotating electrical machine control system according to the present invention, each of the first detection unit and the second detection unit is a resolver device, and each of the two rotation angle information conversion units converts the detection result of the resolver device into a digital signal. A resolver digital conversion device to be supplied to the control unit. When one of the two rotation angle information conversion units fails, the control unit is connected to the failed rotation angle information conversion unit by switching the switching unit. It is preferable to switch the connection of the resolver device to the remaining one normal rotation angle information conversion unit.

  With the above configuration, the rotating electrical machine control system includes the first detection unit that detects the rotation angle of the first rotating electrical machine, the second detection unit that detects the rotation angle of the second rotating electrical machine, and the two rotation angle information conversion units. Then, the detection result of either the first detection unit or the second detection unit is converted into one side rotation angle information by one rotation angle information conversion unit, and the other detection result is converted by the other rotation angle information conversion unit. Two rotation angle information conversion units that convert to the other side rotation angle information, and a switching unit that can switch each connection destination of the two rotation angle information units between the first detection unit or the second detection unit. Prepare.

  Then, the vehicle operation is continued by controlling the operation of the first rotating electrical machine or the second rotating electrical machine using the one normal rotational angle information converting unit remaining when any one of the two rotational angle information converting units fails. The control mode is alternately switched between the direct travel control mode in which the engine travels and the rotating electrical machine travel control mode in which the second rotating electrical machine travels by switching in the switching unit according to the failure travel means and the state of charge of the power storage device. Switch to. Thus, since the control mode is alternately switched between the straight traveling control mode and the rotating electrical machine traveling control mode by switching the switching unit according to the state of charge of the power storage device, the conventional technology does not switch the control mode. Compared to the above, the evacuation travel distance can be greatly extended.

  Further, in the rotating electrical machine control system, when the state of charge of the power storage device falls to a predetermined lower limit threshold, the engine is driven by the engine with the connection destination of the normal rotation angle information conversion unit as the first detection unit. In the direct running control mode for charging the power storage device in accordance with the above, when the state of charge of the power storage device rises to a predetermined upper limit threshold, the power supply from the power storage device is performed using the connection destination of the normal rotation angle information conversion unit as the second detection unit In response to this, the control mode is alternately switched as the rotating electric machine traveling control mode in which the second rotating electric machine travels. Therefore, the evacuation travel distance can be greatly extended while preventing overdischarge and overcharge of the power storage device.

  In the rotating electrical machine control system, each of the first detection unit and the second detection unit is a resolver device, and each of the two rotation angle information conversion units converts the detection result of the resolver device into a digital signal and supplies the digital signal to the control unit. The resolver digital conversion device that controls the resolver device connected to the failed rotation angle information conversion unit by switching the switching unit when one of the two rotation angle information conversion units fails. Then, the connection is switched to the remaining one normal rotation angle information conversion unit. Therefore, it is possible to significantly extend the evacuation travel distance by effectively using the remaining one normal rotation angle information conversion unit.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the power distribution between the two rotating electrical machines mounted on the vehicle and the engine will be described as using a planetary mechanism, but other power distribution mechanisms may be used. It is good also as what does not have. In the following, the resolver device will be described as detection means for detecting the rotation angle of the rotating electrical machine. However, any device other than the resolver device may be used as long as the rotation angle detection means is provided for each of the two rotating electrical machines. . For example, the rotation angle may be detected by a Hall element or the like. Further, when the rotation angle can be obtained from the rotation speed of the rotating electrical machine, such means may be used. Also, the resolver digital conversion device will be described as converting rotation angle data detected by the resolver into rotation angle information. However, when the detection unit is other than the resolver, of course, the rotation angle is not a resolver digital conversion device. Other data conversion devices that convert detection data into digital data or the like can be used. In the following description, the rotating electrical machine control electrical control unit is described as being configured by a plurality of LSI chips. However, of course, the rotating electrical machine control electrical control unit may be configured to include electronic components other than the LSI. It is good also as what comprises a chip | tip.

  In the following, in the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a diagram illustrating the configuration of a rotating electrical machine control system 10 that controls the operation of a rotating electrical machine mounted on a hybrid vehicle. This rotating electrical machine control system 10 is sufficiently connected to the two rotating electrical machines 12 and 14 mounted on the vehicle when the failure occurs with respect to the rotating electrical machine on one side, and the vehicle is sufficiently retracted to retreat to a safe place. It has a function to perform control. In FIG. 1, the vehicle axle 4, the engine 6, and the power distribution mechanism 8 are illustrated, although they are not constituent elements of the rotating electrical machine control system 10.

  The engine 6 is an internal combustion engine mounted on a vehicle, and has functions of driving the vehicle axle 4 and driving the rotating electrical machine 12 to generate electric power based on its output. The power distribution mechanism 8 is a mechanism that distributes power between the engine 6 and the two rotating electrical machines 12 and 14, and for example, a planetary gear mechanism can be used. By using the power distribution mechanism 8, the power generated by the engine 6 is divided into two systems, one is transmitted to the axle 4 as a driving force, and the other is driven by the rotating electrical machine 12 to generate electricity, thereby The rotating electrical machine 14 connected to the drive shaft can be driven by the generated power.

  The rotating electrical machine control system 10 determines the rotational angle of the rotor of the first rotating electrical machine (MG-1) 12, the second rotating electrical machine (MG-2) 14, and the first rotating electrical machine 12, which are two rotating electrical machines. 1st resolver 22 to detect, 2nd resolver 24 which detects the rotation angle of the rotor of 2nd rotary electric machine 14, rotary electric machine drive circuit 34, high voltage power supply part 40, HV control ECU42, rotary electric machine control ECU50 are included. Consists of.

  The first rotating electrical machine (MG1) 12 is a motor / generator (MG) mounted on a vehicle, and is a three-phase synchronous rotating electrical machine connected to the engine 6 and having a function of generating electric power by the driving force of the engine 6. is there.

  The second rotating electrical machine (MG2) 14 is a motor / generator (MG) mounted on the vehicle, which functions as a motor when electric power is supplied and functions as a generator during braking. Electric. Thus, the second rotating electrical machine 14 has a function of assisting the power of the engine 6 transmitted to the axle 4 and increasing the driving force.

  The two current sensors 30 and 32 are a current sensor a that detects the current of the first rotating electrical machine 12 and a current sensor b that detects the current of the second rotating electrical machine 14. The detected current data is transmitted to the general-purpose circuit unit 64 constituting the rotating electrical machine microprocessor 60 and used for driving control of the rotating electrical machines 12 and 14.

  The first resolver (MG1 resolver) 22 is provided in the first rotating electrical machine 12 as described above, and is a rotation angle detection means for detecting the rotation angle of the rotor. Can be called. Similarly, the second resolver 24 (MG2 resolver) is a rotation angle detection unit that is provided in the second rotating electrical machine 14 and detects the rotation angle of the rotor, and can be called a second detection unit. Both the first resolver 22 and the second resolver 24 have the same basic configuration, and are connected to the respective rotor shafts of the rotary electric machines 12 and 14, and are electrically connected with two signals that are 90 degrees out of phase with each other. A rotation angle detection sensor configured to output. FIG. 2 shows the waveforms of the two signals 21 and 23 of the first resolver 22 that are 90 degrees out of phase with each other. The horizontal axis is the rotation angle, and the vertical axis is the output value. The absolute value of the rotation angle can be detected based on the difference in the envelope output value for each of the two signals 21 and 23.

  The rotating electrical machine drive circuit 34 is a circuit that drives the rotating electrical machines 12 and 14, and includes a drive element unit 38 that includes an IGBT (Insulated Gate Bipolar Transistor) and a control circuit unit 36 that drives the drive element unit 38. The control circuit unit 36 controls switching of the IGBT constituting the drive element unit 38 based on the three-phase drive signal output from the three-phase drive circuit 46 included in the rotating electrical machine control ECU 50.

  The rotating electrical machine drive circuit 34 has a function of converting DC power supplied from the high-voltage power supply unit 40 into three-phase AC power by the function of the drive element unit 38 and supplying the DC power to the rotating electrical machines 12 and 14 during driving of the vehicle. The three-phase AC power of the first rotating electrical machine 12 generated by the power of the engine 6 is converted into DC power, and the AC power that is regenerative energy recovered by the second rotating electrical machine 14 during braking of the vehicle Is an orthogonal / AC / DC power conversion circuit having a function of converting the power into DC power. Specifically, it can be configured by two inverters corresponding to the drive element unit 38 and an inverter control circuit corresponding to the control circuit unit 36.

  The high-voltage power supply unit 40 is a high-voltage power storage device connected to the positive-side bus and the negative-side bus of the rotating electrical machine drive circuit 34. When the rotating electrical machine drive circuit 34 performs orthogonal power conversion, the high-voltage power supply unit 40 supplies and discharges high-voltage DC power to the rotating electrical machine drive circuit 34, and when the rotating electrical machine drive circuit 34 performs AC / DC power conversion, The high voltage direct current power is received from the rotating electrical machine drive circuit 34 and charged. As such a high voltage power supply unit 40, a lithium ion assembled battery, a nickel hydride assembled battery or a capacitor having a terminal voltage of about 200V to about 300V can be used.

The state of charge of the high-voltage power supply unit 40 is called SOC (State Of Charge),
Charging / discharging is controlled by a power supply unit ECU (not shown) so as to be in a range between Q%, which is an upper limit value that does not cause overcharging, and a lower limit value P% that does not cause overcharging. As an example of the upper limit value Q% and the lower limit value P% of the SOC, Q% can be about 65% and P% can be about 45%. Of course, this is an example, and other values can be set.

  The HV control ECU 42 is an electric control unit having a function of controlling each element constituting the hybrid vehicle as a whole. Here, in particular, a torque command value or the like, which is an instruction related to the control of the rotary electric machines 12 and 14, is used. It has a function of transmitting to the microprocessor 60 and a function of monitoring the SOC of the high-voltage power supply unit 40 and transmitting the result to the rotating electrical machine microprocessor 60. Transmission from the HV control ECU 42 to the rotating electrical machine microprocessor 60 is performed via a communication I / F 44 included in the rotating electrical machine microprocessor 60.

  The rotating electrical machine control ECU 50 includes a first input circuit (input circuit a) 52 that is an interface circuit between the first resolver 22 and a second input circuit (input) that is an interface circuit between the second resolver 24. The circuit b) 54 and the rotating electrical machine microprocessor 60 are included. The rotating electrical machine microprocessor 60 includes a custom circuit unit 62 and a general-purpose circuit unit 64.

  The custom circuit unit 62 includes a selector unit 70, a first R / D converter (R / D converter a) 72, a second R / D converter (R / D converter b) 74, a first monitor signal line 73, A second monitor signal line 75 is included. The custom circuit unit 62 is configured by one LSI chip, but of course, it may be configured by a plurality of LSI chips.

  The selector unit 70 includes two selectors. One selector is a circuit that selects the connection destination of the first input circuit 52 as either S1 or S2, and the other selector is the second input circuit 54. The connection destination is selected as either S3 or S4. The selection is such that when one selector selects S1, the other selector selects S3, and when one selector selects S2, the other selector selects S4, and so on. Performed in pairs. Selection is controlled by the general-purpose circuit unit 64.

  Here, S1 and S4 are connected to the first R / D converter 72 and the monitor signal line 73, and S2 and S3 are connected to the second R / D converter 74 and the monitor signal line 75. Therefore, the above selection means that the connection destinations of the first R / D converter 72 and the monitor signal line 73 and the second R / D converter 74 and the monitor signal line 75 are connected to each other. One input circuit 52, that is, the first resolver 22, or the second input circuit 54, that is, the second resolver 24 is selected.

  That is, when S1-S3 is selected, the connection destination of the set of the first R / D converter 72 and the monitor signal line 73 becomes the first resolver 22, and the second R / D converter 74 and the monitor signal line are connected. The 75 sets of connection destinations are the second resolver 24. On the other hand, when the selection of S2-S4 is performed, the connection destination of the set of the first R / D converter 72 and the monitor signal line 73 becomes the second resolver 24, and the second R / D converter 74 and the monitor signal line are connected. The 75 sets of connection destinations are the first resolver 22. The selector unit 70 is a switching unit that can switch the connection destinations of the two R / D converters 72 and 74 between the first resolver 22 and the second resolver 24 in this way.

  Here, the two R / D converters 72 and 74 have a function of converting the rotation angle data, which is an analog signal detected by the two resolvers 22 and 24, into digital rotation angle information and outputting the digital rotation angle data to the general-purpose circuit unit 64. This can be called a rotation angle information converter. The two R / D converters 72 and 74 convert the detection result of one of the first resolver 22 as the first detection unit or the second resolver 24 as the second detection unit into the two R / D converters. One of the converters 72 and 74 is converted into one-side rotation angle information, and the other detection result of the first resolver 22 or the second resolver 24 is converted into one of the two R / D converters 72 and 74. On the other hand, it has a function of converting to the other side rotation angle information. That is, the two R / D converters 72 and 74 are both analogs of the resolver that is the connection destination regardless of which of the two resolvers 22 and 24 is selected as the connection destination by the selector unit 70 that is the switching unit. The detection result is converted into digital rotation angle information and output to the general-purpose circuit unit 64.

  The first monitor signal line 73 is a signal line having a function of transmitting the resolver detection signal input to the first R / D converter 72 to the general-purpose circuit unit 64 as an analog signal. Similarly, the second monitor signal line 75 is a signal line having a function of transmitting the resolver detection signal input to the second R / D converter 74 to the general-purpose circuit unit 64 as an analog signal. The analog signal transmitted to the general-purpose circuit unit 64 is converted into a digital signal by an A / D converter. The accuracy of the converted digital signal is worse than the accuracy of the digital signal converted by the R / D converters 72 and 74 and cannot be used for controlling the rotating electrical machines 12 and 14. In other words, the R / D converters 72 and 74 are highly accurate A / D converter circuits.

  A digital signal obtained by converting the analog signal transmitted through the monitor signal lines 73 and 75 cannot be used for controlling the rotating electrical machines 12 and 14, but can detect a malfunction of the R / D converters 72 and 74. That is, the analog signal transmitted through the monitor signal lines 73 and 75 is used for monitoring malfunction or failure of the R / D converters 72 and 74.

  The general-purpose circuit unit 64 includes a circuit such as the A / D converter, serial I / O, clock generation circuit, and timer, a CPU 66, and a memory 68 that stores a program and the like. The general-purpose circuit unit 64 is composed of one LSI chip, but of course, it may be composed of a plurality of LSI chips.

  The CPU 66 has a function as a control unit that supplies the three-phase drive circuit 46 with a three-phase drive signal that controls the operation of the rotating electrical machines 12 and 14 based on the outputs from the R / D converters 72 and 74. Based on the data transmitted from the monitor signal lines 73 and 75, the CPU 66 determines whether or not the first R / D converter 72 is faulty and whether or not the second R / D converter 74 is faulty. The operation of the first rotating electrical machine 12 or the second rotating electrical machine 14 using the failure determination module and one normal R / D converter that remains when one of the two R / D converters 72 and 74 fails. The vehicle travels in the engine 6 by switching in the selector unit 70 that is a switching unit according to the SOC that is the state of charge of the high-voltage power supply unit 40 that is a power storage device and the SOC that is the state of charge of the high-voltage power supply unit 40 that is a power storage device. An alternate switching module that alternately switches the control mode between the control mode and the rotating electrical machine traveling control mode that travels by the second rotating electrical machine 14 is configured. Such a function can be realized by software, specifically, by executing a rotating electrical machine control program.

  The operation of the above configuration, in particular, each function of the CPU 66 as the control unit will be described in detail with reference to the flowcharts of FIGS. 3, 4, and 6 and the time charts of FIGS. 3, 4, and 5 are flowcharts showing a procedure for extending the evacuation travel distance of the vehicle when one of the R / D converters 72 and 74 breaks down. It corresponds to each processing procedure. FIG. 3 is a flowchart showing a procedure for determining which of the two R / D converters 72 and 74 has failed. FIG. 4 is a flowchart showing a processing procedure when the first R / D converter 72 has failed. 6 is a flowchart showing a processing procedure when the second R / D converter 74 fails. FIG. 5 is a time chart showing changes in the state of each element when the first R / D converter 72 fails, and FIG. 7 shows the state of each element when the second R / D converter 74 fails. It is a time chart which shows the change of.

  As shown in FIG. 3, in the normal state, the selector unit 70 is set to S1-S3 (S10). That is, the connection destination of the first R / D converter 72 is the first resolver 22, and the connection destination of the second R / D converter 74 is the second resolver 24.

  Then, it is determined whether or not a failure is detected in the R / D converter a which is the first R / D converter 72 (S12). This determination is executed by the function of the failure determination module of the CPU 66 that is a control unit. Specifically, the output signal of the first R / D converter 72 is compared with the signal after digital conversion of the analog signal transmitted through the first monitor signal line 73, and the difference between them is a predetermined difference threshold value. It is possible to determine that the first R / D converter 72 is out of order when the value exceeds. If the determination in step S12 is affirmative, the process proceeds to the procedure shown in the flowchart of FIG.

  If the determination in S12 is negative, it is next determined whether or not a failure is detected in the R / D converter b that is the second R / D converter 74 (S14). This determination is also executed by the function of the failure determination module of the CPU 66 that is the control unit. Specifically, the output signal of the second R / D converter 74 is compared with a signal obtained by digitally converting the analog signal transmitted through the second monitor signal line 75, and the difference between them is a predetermined difference threshold value. It is possible to determine that the second R / D converter 72 is faulty when the value exceeds. If the determination in step S14 is affirmative, the process proceeds to the procedure shown in the flowchart of FIG. If the determination is negative in S14, the process returns to S12 again.

  If the determination in S12 is affirmed as described above, the procedure proceeds to the flowchart of FIG. Here, first, since it is determined that the first R / D converter 72 has failed, the operation of the first rotating electrical machine 12 is stopped and the operation of the engine 6 is also stopped. Then, using the output of the second R / D converter 74 that is not regarded as a failure, the rotation angle information of the second rotating electrical machine 14 by the second resolver 24, the current value information of the second current sensor 32, HV Based on the torque command from the control ECU 42, the general-purpose circuit unit 64 outputs a three-phase drive signal for operating the second rotary electric machine 14 to the rotary electric machine drive circuit 34 via the three-phase drive circuit 46. . As a result, the operation of the second rotating electrical machine 14 is controlled, and EV evacuation traveling is performed in a so-called rotating electrical machine traveling control mode (S20). This process is executed by the function of the traveling module at the time of failure of the CPU 66 as the control unit.

  This is shown in FIG. FIG. 5 shows time on the horizontal axis and the state of each element on the vertical axis. Here, from the upper stage side to the lower stage side of FIG. 5, the state of the R / D converter a that is the first R / D converter 72 and the state of the R / D converter b that is the second R / D converter 74. The selection state in the selectors S1 and S2 on one side of the selector unit 70, the selection state in the selectors S1 and S2 on the other side, the state of the engine 6, the state of MG1 as the first rotating electrical machine 12, the second rotating electrical machine 14 The state of MG2, the state of SOC of the high-voltage power supply unit 40, and the traveling state of the vehicle are shown in order.

Here, until time t ₁ , both the first R / D converter 72 and the second R / D converter 74 are in a normal state. During this period, both the first rotating electrical machine 12 and the second rotating electrical machine 14 are operating normally under control according to the rotation angle that is normally detected. Similarly, the engine 6 is operating normally. The SOC is appropriately charged and discharged, and normally changes in the range between the upper limit value Q% and the lower limit value P%.

In FIG. 5, an abnormality is detected in the R / D converter a which is the first R / D converter 72 at time t ₁ . In terms of the flow chart of FIG. 3, S12 judgment is affirmed at time t _1. Therefore, the engine 6 is stopped, and MG1, which is the first rotating electrical machine 12, is stopped. In the second rotating electrical machine 14, since the selector unit 70 remains in the selection of S1-S3, the normal connection destination of the second R / D converter 74 remains the second resolver 24. Based on normal rotation angle detection, normal operation control is continued. That is, the vehicle can continue traveling by normal operation of the second rotating electrical machine 14. That is, even after time t ₁ , EV evacuation traveling in the rotating electrical machine traveling control mode can be continued. At this time, since the first rotating electrical machine 12 is not operating, the high-voltage power supply unit 40 continues to discharge, and the SOC gradually decreases.

  Returning to FIG. 4 again, it is determined whether or not the SOC is equal to or lower than the lower limit value P% (S22). If the determination is affirmed in S22, the selector unit 70 switches the selection to the setting of S2-S4 (S24). By this switching, the normal connection destination of the second R / D converter 74 becomes the first resolver 22, and the connection destination of the failed first R / D converter 72 becomes the second resolver 24. Accordingly, since the detection data of the second resolver 24 is not correctly transmitted to the general-purpose circuit unit 64, the operation of the second rotating electrical machine 14 is stopped here. Then, since the detection data of the first resolver 22 is transmitted to the general-purpose circuit unit 64 by the normal second R / D converter 74, the rotation angle information of the first rotating electrical machine 12 and the first current sensor 30 Based on the current value information, the torque command from the HV control ECU 42, etc., the general-purpose circuit unit 64 generates a three-phase drive signal for operating the first rotary electric machine 12 via the three-phase drive circuit 46. Output to the circuit 34. As a result, the operation control of the first rotating electrical machine 12 is performed, and by the operation of the engine 6, the first rotating electrical machine 12 generates power and the high-voltage power supply unit 40 is charged. Further, the engine 6 is operated to perform the receding traveling in the so-called direct traveling control mode (S26). At this time, since the high voltage power supply unit 40 is charged, the SOC gradually increases.

This is shown after time t ₁ in FIG. That is, since the first rotating electrical machine 12 is not operating after time t ₁ , the high-voltage power supply unit 40 continues to discharge and the SOC gradually decreases. At time t ₂ , the SOC becomes the lower limit value P% or less. In terms of the flow chart of FIG. 4, at time t ₂ S22 judgment is affirmed. Therefore, in the selector unit 70, the setting is switched to S2-S4. And MG2 which is the 2nd rotary electric machine 14 is stopped. Instead, the engine 6 is operated, and the first rotating electrical machine 12 MG1 is operated. In the first rotating electrical machine 12, since the selector unit 70 has switched to the selection of S2-S4, the normal second R / D converter 74 is connected to the first resolver 22, thereby The rotating electrical machine 12 continues normal operation control based on normal rotation angle detection. That is, the vehicle can continue traveling by restarting the operation of the engine 6. That is, even after time t ₂ , the direct evacuation traveling in the direct traveling control mode can be continued. At this time, since the first rotating electrical machine 12 operates, the high-voltage power supply unit 40 is charged, and the SOC gradually increases.

  Returning to FIG. 4 again, it is determined whether or not the SOC is equal to or higher than the upper limit value Q% (S28). When the determination is affirmed in S28, the selector unit 70 switches the selection to the setting of S1-S3 (S30). By this switching, the normal connection destination of the second R / D converter 74 becomes the second resolver 24 again, and the connection destination of the failed first R / D converter 72 is returned to the first resolver 22. . Accordingly, since the detection data of the first resolver 22 is not correctly transmitted to the general-purpose circuit unit 64, the operation of the first rotating electrical machine 12 is stopped here. The operation of the engine 6 is also stopped. Then, since the detection data of the second resolver 24 is transmitted to the general-purpose circuit unit 64 by the normal second R / D converter 74, the rotation angle information of the second rotating electrical machine 14 and the second current sensor 32 Based on the current value information, the torque command from the HV control ECU 42, etc., the general-purpose circuit unit 64 generates a three-phase drive signal for operating the second rotary electric machine 14 via the three-phase drive circuit 46. Output to the circuit 34. Thereby, the operation control of the second rotating electrical machine 14 is performed, and EV retreat traveling is performed in a so-called rotating electrical machine traveling control mode (S20). As a result, the flow returns to the initial state of the flowchart of FIG. 4, and thereafter, the procedure described above is repeated.

This state is shown at time t ₂ after the FIG. That is, since the time t ₂ subsequent first rotating electric machine 12 is activated, high voltage power supply unit 40 is charged, SOC is Yuku gradually increased. At time t ₃ , the SOC becomes the upper limit value Q% or more. In terms of the flow chart of FIG. 4, S28 judgment is affirmed at time t _3. Therefore, in the selector unit 70, the setting is switched to S1-S3. Then, the engine 6 and the first rotating electrical machine MG1 are stopped. Instead, MG2 which is the second rotating electrical machine 14 is operated. In the second rotating electrical machine 14, since the selector unit 70 has switched to the selection of S1-S3, the connection destination of the normal second R / D converter 74 becomes the second resolver 22 again. The second rotating electrical machine 14 continues normal operation control based on normal rotation angle detection. That is, the vehicle can continue traveling by restarting the operation of the second rotating electrical machine 14. That is, even after time t ₃ , EV evacuation traveling in the rotating electrical machine traveling control mode can be continued. At this time, since the first rotating electrical machine 12 is not operating, the high-voltage power supply unit 40 continues to discharge, and the SOC gradually decreases. At time t ₄ , the SOC again becomes the lower limit value P% or less. This state is the same as the time t _2.

  As described above, the direct drive control mode in which the engine 6 travels and the second rotating electrical machine 14 by the switching in the selector unit 70 that is the switching unit according to the SOC that is the charged state of the high-voltage power supply unit 40 that is the power storage device. The control mode is switched alternately between the rotating electrical machine traveling control mode that travels. These procedures are executed by the function of the alternating switching module of the CPU 66 which is a control unit. Thereby, the retreat travel time or the retreat travel distance can be extended until the vehicle moves to a safe place.

  Returning to FIG. 3 again, if the determination in S14 is affirmative, the procedure proceeds to the procedure shown in the flowchart of FIG. Also in this case, according to the SOC that is the state of charge of the high-voltage power supply unit 40 that is the power storage device, by the switching in the selector unit 70 that is the switching unit, the straight traveling control mode that travels with the engine 6 and the second rotating electrical machine 14 that travels. The control mode is switched alternately between the rotating electric machine traveling control mode.

  That is, initially, since it is determined that the second R / D converter 74 has failed, the operation of the second rotating electrical machine 14 is stopped. Then, with the operation of the engine 6 as it is, the rotation angle information of the first rotating electrical machine 12 by the first resolver 22 and the first current sensor using the output of the first R / D converter 72 that is not in failure. The general-purpose circuit unit 64 rotates the three-phase drive signal for the operation of the first rotating electrical machine 12 via the three-phase drive circuit 46 based on the current value information of 30 and the torque command from the HV control ECU 42. Output to the electric drive circuit 34. Thereby, the operation of the first rotating electrical machine 12 is controlled. In this way, using the operation of the engine 6, the direct retreat travel is performed in the so-called direct travel control mode (S32). This process is executed by the function of the traveling module at the time of failure of the CPU 66 as the control unit.

This is shown in FIG. FIG. 7 is a time chart in which time is plotted on the horizontal axis and the state of each element is plotted on the vertical axis, as in FIG. Here, at time t ₁₁ , an abnormality was detected in the R / D converter b which is the second R / D converter 74. In terms of the flow chart of FIG. 6, at time t ₁₁ S32 the determination is affirmative. Therefore, MG2, which is the second rotating electrical machine 14, is stopped. In the first rotating electrical machine 12, since the selector unit 70 remains in the selection of S1-S3, the normal connection destination of the first R / D converter 72 remains the first resolver 22, thereby Based on normal rotation angle detection, normal operation control is continued. Further, since the operation of the engine 6 remains as it is, the vehicle can continue traveling. That is, even after time t ₁₁ , the direct retreat travel in the direct travel control mode can be continued. At this time, since the first rotating electrical machine 12 operates, the high-voltage power supply unit 40 is charged and the SOC gradually increases.

  Therefore, returning to FIG. 6, it is determined whether or not the SOC is equal to or higher than the upper limit value Q% (S34). If the determination becomes affirmative, the selector unit 70 switches the selection to the setting of S2-S4 (S36). By this switching, the normal connection destination of the first R / D converter 72 becomes the second resolver 24, and the connection destination of the failed second R / D converter 74 becomes the first resolver 22. Accordingly, since the detection data of the first resolver 22 is not correctly transmitted to the general-purpose circuit unit 64, the operation of the first rotating electrical machine 12 is stopped here. The operation of the engine 6 is also stopped. Then, since the detection data of the second resolver 24 is transmitted to the general-purpose circuit unit 64 by the normal first R / D converter 72, the rotation angle information of the second rotating electrical machine 14 and the second current sensor 32 Based on the current value information, the torque command from the HV control ECU 42, etc., the general-purpose circuit unit 64 generates a three-phase drive signal for operating the second rotary electric machine 14 via the three-phase drive circuit 46. Output to the circuit 34. Thereby, the operation control of the second rotating electrical machine 14 is performed, and EV retreat traveling is performed in a so-called rotating electrical machine traveling control mode (S38). At this time, since the first rotating electrical machine 12 does not operate, the high-voltage power supply unit 40 continues to discharge, and the SOC gradually decreases.

  Then, it is determined whether or not the SOC is equal to or lower than the lower limit value P% (S40). When the determination is affirmed in S40, the selector unit 70 switches the selection to the setting of S1-S3 (S42). By this switching, the connection destination of the normal first R / D converter 72 becomes the first resolver 22 again, and the connection destination of the failed second R / D converter 74 is returned to the second resolver 24. . Accordingly, since the detection data of the second resolver 24 is not correctly transmitted to the general-purpose circuit unit 64, the operation of the second rotating electrical machine 14 is stopped here. Then, the operation of the engine 6 is resumed. Further, since the detection data of the first resolver 22 is transmitted to the general-purpose circuit unit 64 by the normal first R / D converter 72, the rotation angle information of the first rotating electrical machine 12, the first current sensor 30 Based on the current value information, the torque command from the HV control ECU 42, etc., the general-purpose circuit unit 64 generates a three-phase drive signal for operating the first rotary electric machine 12 via the three-phase drive circuit 46. Output to the circuit 34. Thereby, the operation control of the first rotating electrical machine 12 is performed, and the high-voltage power supply unit 40 is charged. Then, by the operation of the engine, a direct retreat travel is performed in a so-called direct travel control mode (S32). As a result, the initial state of the flowchart of FIG. 6 is restored, and thereafter the procedure described above is repeated.

These aspects are shown in FIG. That is, during the time t ₁₁ to the time t ₁₂ , the operation of the second rotating electrical machine 14 is stopped, and the direct retreat travel is performed by the operation of the engine 6. The high-voltage power supply unit 40 is charged by the operation of the first rotating electrical machine 12, and the SOC gradually increases. The SOC is changed the setting of the selector unit 70 at time t ₁₂ as the Q%, the operation of the engine 6 and the first rotating electric machine 12 is stopped and the second rotating electric machine 14 is operated, EV limp row Is called. Here, since the high voltage power supply 40 continues to discharge, the SOC gradually decreases. Then, SOC is returned back to the original setting of the selector 70 at time t ₁₃ as the P%, the operation of the engine 6 and the first rotating electric machine 12 is resumed, the operation of the second rotary electric machine 14 is stopped . As a result, direct retreat travel is performed.

  As described above, even when the second R / D converter 74 is in failure, the engine is switched by the selector unit 70 that is the switching unit according to the SOC that is the charged state of the high-voltage power supply unit 40 that is the power storage device. The control mode is alternately switched between the straight traveling control mode traveling at 6 and the rotating electrical machine traveling control mode traveling at the second rotating electrical machine 14. These procedures are executed by the function of the alternating switching module of the CPU 66 which is a control unit. Thereby, the retreat travel time or the retreat travel distance can be extended until the vehicle moves to a safe place.

It is a figure explaining the structure of the rotary electric machine control system in embodiment which concerns on this invention. It is a figure which shows the mode of the waveform of two signals which a 90 degree phase shift | deviated mutually detected by a resolver. 6 is a flowchart showing a procedure for determining which of two R / D converters has failed in the embodiment according to the present invention. 5 is a flowchart showing a processing procedure when the first R / D converter fails in the embodiment according to the invention. 5 is a time chart showing changes in the state of each element when the first R / D converter fails, corresponding to FIG. In embodiment concerning this invention, it is a flowchart which shows the process sequence when the 2nd R / D converter fails. FIG. 7 is a time chart showing a change in the state of each element when the second R / D converter fails, corresponding to FIG. 6.

Explanation of symbols

  4 axle, 6 engine, 8 power distribution mechanism, 10 rotating electrical machine control system, 12, 14 rotating electrical machine, 21, 23 signal, 22, 24 resolver, 30, 32 current sensor, 34 rotating electrical machine drive circuit, 36 control circuit unit, 38 drive element section, 40 high-voltage power supply section, 42 HV control ECU, 44 communication I / F, 46 three-phase drive circuit, 50 rotating electrical machine control ECU, 52, 54 input circuit, 60 rotating electrical machine microprocessor, 62 custom circuit section, 64 General-purpose circuit part, 66 CPU, 68 Memory, 70 Selector part, 72, 74 R / D converter, 73, 75 Monitor signal line.

Claims (3)

A first detection unit that detects a rotation angle of a first rotating electrical machine that is connected to the engine and generates power to charge the power storage device;
A second detector for detecting a rotation angle of a second rotating electrical machine connected to the power storage device and capable of driving the vehicle;
Two rotation angle information conversion units, wherein one detection result of the first detection unit or the second detection unit is converted into one side rotation angle information by one rotation angle information conversion unit, and the other detection result is converted Two rotation angle information conversion units that convert the other rotation angle information conversion unit into the other side rotation angle information;
A switching unit capable of switching each connection destination of the two rotation angle information conversion units between the first detection unit or the second detection unit;
A control unit that controls the operation of the first rotating electrical machine and the operation of the second rotating electrical machine based on the output of the rotation angle information conversion unit;
With
The control unit
When one of the two rotation angle information conversion units fails and the normal rotation angle information conversion unit remaining is used to control the operation of the first rotating electric machine or the second rotating electric machine and continue the vehicle running Traveling means;
An alternate switching means for alternately switching a control mode between a straight traveling control mode traveling by the engine and a rotating electrical machine traveling control mode traveling by the second rotating electrical machine by switching in the switching unit according to a charging state of the power storage device; ,
A rotating electrical machine control system comprising: In the rotating electrical machine control system according to claim 1,
The alternate switching means is
When the state of charge of the power storage device falls to a predetermined lower limit threshold, the vehicle travels with the engine using the connection destination of the normal rotation angle information conversion unit as the first detection unit, and charges the power storage device with power generation by the first rotating electrical machine. In the control mode, when the state of charge of the power storage device rises to a predetermined upper limit threshold value, the second rotating electrical machine receives power supply from the power storage device with the connection destination of the normal rotation angle information conversion unit as the second detection unit. A rotating electrical machine control system, wherein a control mode is alternately switched as a traveling electrical machine traveling control mode for traveling. In the rotating electrical machine control system according to claim 1,
Each of the first detector and the second detector is a resolver device,
Each of the two rotation angle information conversion units is a resolver digital conversion device that converts a detection result of the resolver device into a digital signal and supplies the digital signal to the control unit.
The control unit
When any one of the two rotation angle information conversion units fails, the resolver device connected to the failed rotation angle information conversion unit is connected to the remaining one normal rotation angle information conversion unit by switching the switching unit. Rotating electrical machine control system characterized by switching.

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