JP7196710B2 - Automotive power supply system controller - Google Patents

Description

The present invention relates to a control device for an in-vehicle power supply system mounted in a vehicle.

2. Description of the Related Art Conventionally, there is one described in Patent Document 1 as an in-vehicle power supply system. This vehicle-mounted power supply system includes a first storage battery, a second storage battery, a rotating electrical machine, and a switch that switches electrical connection between the second storage battery and the rotating electrical machine. In the in-vehicle power supply system, powering of the rotating electrical machine is prohibited in order to prevent a drop in voltage across the terminals of the second storage battery due to powering of the rotating electrical machine when a sticking abnormality of the switch is detected.

Japanese Patent No. 5930041

In an in-vehicle power supply system, there are cases where a sticking abnormality occurs in a switch that is being operated in the ON state while the rotating electric machine is being driven. However, the drive is forcibly stopped. For example, when the rotary electric machine is assisting the output of the engine by driving the electric rotary machine, the assisting of the engine output by the rotary electric machine is stopped due to the sticking abnormality of the switch being operated in the ON state. Therefore, there is a concern that the stopping of the rotating electric machine due to the sticking abnormality may make the driver feel uncomfortable.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and provides an appropriate measure without causing discomfort to the driver when a sticking abnormality occurs in a switch for switching electrical connection between a rotating electric machine and a storage battery. It is an object of the present invention to provide a control device for an in-vehicle power supply system capable of

In order to solve the above problems, a first aspect of the present invention provides a rotating electrical machine, first storage batteries and second storage batteries connected in parallel to the rotating electrical machine, and electricity between the rotating electrical machine and the first storage battery. and a second switch for switching electrical connection between the rotating electric machine and the second storage battery. The present invention relates to a control device that turns on at least one of the first switch and the second switch when driving any one of them. When either the first switch or the second switch is turned on and the rotating electric machine is driven, the control device detects that the switch in the on state has a sticking abnormality. and an abnormality determination unit that determines whether or not the first switch and the second switch are turned off during the drive request period of the rotating electrical machine when it is determined that the fixation abnormality has occurred. a fail-safe control unit that operates a state switch to an ON state and continues while limiting the driving of the rotating electric machine.

When it is determined that a sticking abnormality has occurred in an ON-operated switch while the rotating electric machine is being driven, stopping the driving of the rotating electric machine at that point may cause a driver to feel uncomfortable. In addition, even if the rotating electrical machine continues to be driven, the state of the switch determined to be sticking is unstable. There is a concern that the electrical connection between the electric machine and each storage battery may be cut off. In this case, for example, when electric power is supplied from the first and second storage batteries to the rotating electrical machine, there is a concern that the rotating electrical machine will be inconveniently driven, causing the driver to feel uncomfortable. In the above configuration, it is determined whether or not the first switch or the second switch, which is being turned on, has a sticking abnormality while the rotating electric machine is being driven. When it is determined that a sticking abnormality has occurred in a switch that is being turned on, the switch in the off state of the first switch and the second switch is turned on during the drive request period of the rotating electric machine at that time. At the same time, the driving of the rotating electric machine is continued in a limited state. As a result, even if a sticking abnormality occurs in the switch that is being operated in the ON state, the rotary electric machine and the storage battery can be electrically connected by a switch other than this switch. It is possible to perform appropriate treatment without causing a sense of discomfort.

In the second aspect of the invention, the fail-safe control section terminates the driving of the rotating electric machine within the drive request period during which the abnormality determination section determines that the fixation abnormality has occurred. Prohibition of electric drive.

In the above configuration, due to the sticking abnormality of the switch being operated in the on state, the driving of the rotating electric machine is prohibited after continuing while limiting the driving of the rotating electric machine. As a result, it is possible to prevent the rotating electrical machine from being driven again in a state in which the switch that is being turned on is sticking abnormally, and it is possible to take appropriate measures for the rotating electrical machine.

In a third aspect of the invention, the second storage battery is a lithium ion storage battery, the first storage battery is a lead storage battery, and the fail-safe control unit determines that a fixation abnormality has occurred in the second switch. When the first switch is turned on, the driving of the rotating electrical machine is continued while being limited so that the voltage across the terminals of the second storage battery falls within a predetermined output voltage range.

Compared to lead-acid batteries, lithium-ion batteries have less power loss during charging and discharging, and can be charged and discharged with high efficiency. However, lithium-ion batteries have the problem that deterioration is more likely to be accelerated by overcharge and overdischarge than lead-acid batteries. In the above configuration, when power running or regenerative power generation of the rotary electric machine is continued in a state where the second switch being operated in the on state is stuck abnormally, the voltage between the terminals of the lithium ion storage battery, which is the second storage battery, is a predetermined output. Exceeding the voltage range is prevented. As a result, it is possible to continue driving the rotary electric machine while suppressing deterioration of the second storage battery.

In a fourth aspect of the invention, the vehicle-mounted power supply system includes a third switch provided in a bypass path that connects the rotating electric machine and the first storage battery without the first switch, and the bypass path includes: A fusing portion that is fused when a current greater than a predetermined fusing current flows is provided, and the fail-safe control portion, when it is determined that the second switch is stuck abnormally, controls the second switch. While the first switch is turned on, if it is determined that the first switch is stuck, the third switch is turned on, and the current flowing through the bypass path is the fusing current. The rotating electric machine is continued to be driven while being controlled to be smaller than .

When a sticking abnormality occurs in the first switch that is being operated to the ON state, by operating the third switch to the ON state, the first storage battery and the rotating electric machine are connected via the bypass route without the first switch. can continue to be electrically connected between Here, when the rotating electrical machine and the first storage battery are electrically connected via the bypass path, there is a concern that the rotating electrical machine cannot be driven continuously due to the fusing part provided in the bypass path. be. In the above configuration, when the rotating electrical machine and the first storage battery are electrically connected through the bypass path by turning on the third switch, the current flowing through the bypass path is higher than the fusing current. The driving of the rotary electric machine is restricted so as to be small. As a result, even when the first switch is stuck in the ON state, the electrical connection between the first storage battery and the rotating electric machine is maintained, and the driving of the rotating electric machine is stably continued. be able to.

The block diagram of a vehicle-mounted power supply system. FIG. 10 is a view for explaining fail-safe control for sticking abnormality of the switch SW2; FIG. 4 is a diagram for explaining fail-safe control for sticking abnormality of the switch SW1; 4 is a flowchart for explaining fail-safe control by a battery control unit; 4 is a flowchart for explaining fail-safe control by a drive control unit; A timing chart explaining fail-safe control. A timing chart explaining fail-safe control.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an in-vehicle power supply system according to the present invention will be described below with reference to the drawings. An in-vehicle power supply system is a system that supplies electric power to a load mounted in a vehicle.

As shown in FIG. 1, an on-vehicle power supply system 100 includes a rotating electric machine unit 10, a lead storage battery 20 as a first storage battery, and a lithium ion storage battery 30 (hereinafter referred to as a Li storage battery) as a second storage battery. and supplies power to loads 42 and 43 . In the vehicle power supply system 100 , the Li storage battery 30 is provided inside the battery unit 40 . Lead-acid battery 20 and Li-acid battery 30 are connected in parallel to rotary electric machine unit 10 .

The electric load 43 includes a constant-voltage demand load that requires that the voltage supplied from the onboard power supply system 100 be constant or at least fluctuate within a predetermined range. On the other hand, the electric load 42 is a general electric load other than the constant voltage demand load. It can also be said that the electrical load 43 is a load into which a power failure is not allowed, and the electrical load 42 is a load to which a power failure is tolerated compared to the electrical load 43 .

Specific examples of the electric load 43, which is a constant-voltage required load, include a navigation device, an audio device, a meter device, and various ECUs such as a host ECU. In this case, by suppressing the voltage fluctuation of the supplied power, the occurrence of unnecessary resetting and the like in each of the above devices is suppressed, and stable operation can be realized. The electric load 43 may include travel system actuators such as an electric steering device and a brake device. Specific examples of the electric load 42 include a seat heater, a rear window defroster heater, a headlight, a front window wiper, and an air-conditioning fan.

The lead-acid battery 20 is a well-known general-purpose battery. On the other hand, the Li storage battery 30 is a high-density storage battery that has less power loss during charge and discharge than the lead storage battery 20 and has high output density and energy density. The Li storage battery 30 is preferably a storage battery having higher energy efficiency during charging and discharging than the lead storage battery 20 . Also, the Li storage battery 30 is configured as an assembled battery each having a plurality of cells. Each of these storage batteries 20 and 30 has the same rated voltage, for example, 12V.

The rotating electrical machine unit 10 includes a rotating electrical machine 11 that is a three-phase AC motor, an inverter 12 connected to each phase winding of the rotating electrical machine 11, and a rotating electrical machine control that controls driving of the rotating electrical machine 11 by energization control of the inverter 12. a portion 13; The rotary electric machine unit 10 is a generator with a motor function, and is configured as an electromechanically integrated ISG (Integrated Starter Generator). The rotating electric machine 11 has its rotating shaft drivingly connected to an output shaft (crankshaft) of an engine (not shown) by a connecting member consisting of a belt and a pulley, and rotation is transmitted between the rotating electric machine 11 and the engine. The rotary electric machine unit 10 has a power generation function of generating power by rotating the engine output shaft and the axle, and a power running function of applying rotational force to the engine output shaft.

The rotary electric machine 11 is a multiphase winding AC motor, and in this embodiment, it is a three-phase AC motor. The inverter 12 is configured as a power converter having a plurality of semiconductor switching elements. The inverter 12 converts a direct current into a three-phase alternating current during power running, and drives the rotary electric machine 11 in power running with the three-phase alternating current. Inverter 12 also converts the three-phase AC current output from rotary electric machine 11 during power generation into DC current, and supplies the DC current to storage batteries 20 and 30 . Thereby, each storage battery 20 and 30 is charged.

The rotary electric machine control unit 13 is composed of a microcomputer including a CPU, a ROM, a RAM, an input/output interface, and the like. The rotary electric machine control unit 13 controls the on/off of the switching elements of each phase of the inverter 12 according to the energization phase, and controls the energization current by adjusting the on/off ratio (for example, duty ratio) when energizing the coil of each phase. . Specifically, during power running, the rotating electrical machine control unit 13 turns on and off the inverter 12 so as to control the power running torque T1r of the rotating electrical machine 11 to the power running torque target value T1*. During regenerative power generation, the rotating electric machine control unit 13 turns on and off the inverter 12 so as to control the regenerative torque T2r of the rotating electric machine 11 to the regenerative torque target value T2*.

The battery unit 40 has terminals P1, P2, and P3, of which the lead-acid battery 20 and the electric load 42 are connected in parallel to the terminal P1, the rotary electric machine unit 10 is connected to the terminal P2, and the electric power is connected to the terminal P3. A load 43 is connected.

The battery unit 40 is provided with a first electrical path L1 connecting the terminal P1 and the Li storage battery 30 as an intra-unit electrical path. The first electrical path L1 is connected to the terminal P2 at a connection point N1, which is an intermediate point.

A switch SW1 is provided between the connection point N1 and the terminal P1 in the first electrical path L1, and is capable of switching the electrical connection between the rotating electrical machine 11 and the lead-acid battery 20 through the first electrical path L1. there is A switch capable of switching the electrical connection between the rotating electric machine 11 and the Li storage battery 30 via the first electrical path L1 is provided between the connection point N1 and the Li storage battery 30 in the first electrical path L1. SW2 is provided. In this embodiment, the switches SW1 and SW2 are normally open switches.

The battery unit 40 is provided with a second electric path L2 that connects a connection point N3 between the terminal P1 and the switch SW1 and a connection point N4 between the switch SW2 and the Li storage battery 30 as an intra-unit electric path. ing. A terminal P3 is connected to a connection point N2, which is an intermediate point of the second electric path L2. In the second electric path L2, a switch SW3 is provided between the connection point N2 and the connection point N3, and a switch SW4 is provided between the connection point N2 and the connection point N4.

The second electrical path L2 is a small current path (i.e., a small current path with a smaller allowable current than the first electrical path L1) that is assumed to flow a smaller current than the first electrical path L1 side. Electricity is supplied from each of the storage batteries 20 and 30 to the electric load 43 via the path.

Moreover, the battery unit 40 is provided with a bypass path L3 that connects the lead-acid battery 20 and the rotary electric machine 11 without passing through the switch SW1. Specifically, the first end of the bypass path L3 is connected to the connection point N1 between the terminal P2 and the switch SW1 in the first electrical path L1, and the second end is connected to the lead wire outside the battery unit 40. It is connected to the electrical path connected to the positive terminal of the storage battery 20 . The bypass path L3 is provided with a normally closed switch SW5 and a fuse 50 as a fusing part. In addition, in this embodiment, the fuse 50 is provided outside the battery unit 40 in the bypass path L3.

The battery unit 40 includes a battery control section 31 that turns on and off the switches SW1 to SW5. The battery control unit 31 is composed of a microcomputer including a CPU, ROM, RAM, input/output interface, and the like. The battery control unit 31 turns on/off the switches SW1 to SW5 based on the SOC, which is the charging rate of each of the storage batteries 20, 30, and the drive request to the on-vehicle power supply system 100. FIG. Specifically, the battery control unit 31 calculates the SOC of the Li storage battery 30, and controls charging and discharging of the Li storage battery 30 so that this SOC is maintained within a predetermined use range.

The battery unit 40 is provided with a first current sensor 32 that detects current flowing through the switch SW1 and a second current sensor 33 that detects current flowing through the switch SW2. Current values detected by the first and second current sensors 32 and 33 are input to the battery control section 31 .

The rotary electric machine control unit 13 and the battery control unit 31 are communicably connected via a CAN bus 81 . Also, the CAN bus 81 is connected to a host ECU 80 , and the rotary electric machine control unit 13 and the battery control unit 31 can communicate with the host ECU 80 via the CAN bus 81 . When the host ECU 80 requests powering to drive the rotating electrical machine 11 , the host ECU 80 outputs a powering request signal to the battery control section 31 and the rotating electrical machine control section 13 via the CAN bus 81 . When requesting regenerative power generation to drive the rotating electrical machine 11 , the host ECU 80 outputs a regenerative power generation request signal to the battery control unit 31 and the rotating electrical machine control unit 13 via the CAN bus 81 .

In the vehicle-mounted power supply system 100 configured as described above, the switches SW1 to SW4 are in an open state and the switch SW5 is in a closed state before the engine is started. Therefore, lead-acid battery 20 and terminal P<b>2 are electrically connected via bypass path L<b>3 , and power from lead-acid battery 20 causes dark current to flow through rotating electric machine 11 .

After the engine is started, power running and regenerative power generation of the rotating electric machine 11 are performed in accordance with a drive request from the host ECU 80 . During power running, power is supplied to the rotary electric machine 11 from either the Li storage battery 30 or the lead storage battery 20 . When the rotating electric machine 11 is powered by the Li storage battery 30, the switch SW2 is turned on and the switch SW1 is turned off. When supplying power to the rotating electrical machine 11 from the lead-acid battery 20, the switch SW1 is turned on and the switch SW2 is turned off. In this embodiment, during power running, the electric load 43 is supplied with power from the Li storage battery 30 or the lead storage battery 20 by operating the ON/OFF states of the switches SW3 and SW4.

At the time of regenerative power generation, power generated from the rotating electric machine 11 is supplied to at least one of the Li storage battery 30 and the lead storage battery 20 . When charging the Li storage battery 30 with the power generated by the rotary electric machine 11, the switch SW2 is turned on and the switch SW1 is turned off. When the lead-acid battery 20 is charged with the electric power generated by the rotary electric machine 11, the switch SW1 is turned on and the switch SW2 is turned off. When charging both the lead-acid battery 20 and the Li-acid battery 30, the switches SW1 and SW2 are both turned on.

In the in-vehicle power supply system 100 configured as described above, there is a case where the switches SW1 and SW2 that are turned on may become stuck while the rotary electric machine 11 is being driven. Here, the sticking abnormality is an abnormality in which the switches SW1 and SW2 remain on. In this case, it is conceivable to prohibit the power running and regenerative power generation of the rotating electrical machine 11 in consideration of the inconvenience caused by the disconnection of electrical connection between the rotating electrical machine 11 and the storage batteries 20 and 30 . However, if, for example, while the rotary electric machine 11 is assisting the output of the engine, when the sticking abnormality of the switch SW2 during ON operation is detected, the assist by the rotary electric machine 11 is stopped and the driver feels uncomfortable. It is feared that it will cause On the other hand, when the sticking abnormality occurs in the switches SW1 and SW2 during ON operation, the state of the switches SW1 and SW2 in which the sticking abnormality has occurred is unstable when the rotating electric machine 11 is to be continued to be driven. Therefore, there is a possibility that the electric connection between the rotating electric machine 11 and each of the storage batteries 20 and 30 may be interrupted by temporarily switching from the ON state to the OFF state.

While the rotating electrical machine 11 is being driven, if a sticking abnormality occurs in one of the switches SW1 and SW2 that is turned on, the battery control section 31 and the rotating electrical machine control section 13 will In order to stably continue driving, fail-safe control is performed cooperatively. In this embodiment, the battery control unit 31 and the rotating electric machine control unit 13 correspond to the fail-safe control unit.

In the present embodiment, the battery control unit 31 determines as follows that the sticking abnormality has occurred in the switch being ON-operated among the switches SW1 and SW2. The operation command for the switches SW1 and SW2 is switched from the ON command to the OFF command, and it is determined whether or not the switches SW1 and SW2 are sticking abnormally according to the change in the current flowing after switching. Specifically, when the operation command for the switch SW1 is switched from the ON command to the OFF command, if the detected current detected by the first current sensor 32 after that becomes lower than a predetermined value, the switch during ON operation It is determined that the switch SW1 is not stuck, and if the detected current does not drop below a predetermined value, it is determined that the switch SW1 is stuck. Similarly, when the operation command for the switch SW2 is switched from the ON command to the OFF command, if the detected current detected by the second current sensor 33 thereafter drops below a predetermined value, the switch SW2 during ON operation It is determined that there is no sticking abnormality, and if the detected current does not drop below a predetermined value, it is determined that the switch SW2 has a sticking abnormality. In this embodiment, the battery control unit 31 corresponds to the abnormality determination unit.

In the present embodiment, the switches SW1 and SW2 that are being turned on are temporarily turned off when the sticking abnormality is determined by the battery control unit 31, so that the electric power supplied to the rotating electrical machine 11 is cut off during power running. There is concern that Therefore, in the determination of sticking abnormality during power running, the electric power supplied to the rotary electric machine 11 is reduced by turning on the switches SW1 and SW2 in the off state during the period in which the switches SW1 and SW2 that are being turned on are turned off. Make sure you don't get blocked. Specifically, when it is determined whether or not there is a sticking abnormality in the switch SW2 that is being turned on, by turning on the switch SW1 during the period in which the switch SW2 is being turned off, the lead-acid battery 20 and the rotating electric machine 11 are electrically connected. connect to. When determining the presence or absence of sticking abnormality for the switch SW1 during ON operation, the rotary electric machine 11 and the Li storage battery 30 are electrically connected by turning ON the switch SW2 while the switch SW1 is turned OFF.

When the battery control unit 31 determines that the sticking abnormality has occurred in the switch being turned on among the switches SW1 and SW2, the battery control unit 31 turns on the switches other than this switch that have been turned off. First, a description will be given of the process when the switch SW2, which is being turned on, is stuck abnormally during power running and regenerative power generation of the rotary electric machine 11. FIG.

In FIG. 2( a ), the switch SW<b>2 is turned on at the time of a power running request from the host ECU 80 , and the electric rotating machine 11 is powered by the Li storage battery 30 . In this state, if it is determined that the switch SW2 is stuck abnormally, the switch SW2 is temporarily switched from the ON state to the OFF state, and the power supply to the rotary electric machine 11 by the Li storage battery 30 may be interrupted. Concerned.

As shown in FIG. 2(b), the battery control unit 31 turns on the switch SW1, which is in the off state, to conduct an electrical path including the switch SW1 between the terminals P1 and P2. As a result, even when the switch SW2 is temporarily switched from the ON state to the OFF state, it is possible to stably supply power to the rotary electric machine 11 from the lead-acid battery 20 .

A description will be given of fail-safe control when it is determined that the switch SW2, which is being turned on, has a sticking abnormality during regenerative power generation. In this case as well, the switch SW2 is turned on, and the electric power generated by the rotary electric machine 11 is supplied to the Li storage battery 30 . In this state, if it is determined that the switch SW2 is stuck abnormally, the switch SW2 is temporarily switched from the ON state to the OFF state, and it is assumed that there is no supply destination for the electric power generated by the rotating electric machine 11. be.

By turning on the switch SW1 in the off state, the battery control unit 31 conducts an electric path including the switch SW1 between the terminals P1 and P2. As a result, the electric power generated by the rotary electric machine 11 is supplied to the lead-acid battery 20 even when the switch SW2 is temporarily switched from the ON state to the OFF state.

Compared to the lead storage battery 20, the Li storage battery 30 has less power loss during charging and discharging, and can be charged and discharged with high efficiency. However, the Li storage battery 30 is more susceptible to accelerated deterioration due to overcharge and overdischarge than the lead storage battery 20 . Therefore, when it is determined that the switch SW2 is stuck, the rotary electric machine control unit 13 limits the torques T1r and T2r in order to prevent the Li storage battery 30 from over-discharging or over-charging. , continue to drive the rotating electric machine 11 . Specifically, the rotating electric machine control unit 13 limits the upper limit of the powering torque T1r during powering so that the voltage across the terminals of the Li storage battery 30 does not fall below the lower limit of the predetermined output voltage range due to overdischarge. do. In addition, the rotary electric machine control unit 13 limits the upper limit value of the regenerative torque T2r during regenerative power generation so that the terminal voltage of the Li storage battery 30 does not exceed the upper limit value of the output voltage range due to overcharging. The output voltage range is a terminal-to-terminal voltage range that is recommended for the Li storage battery 30 so as not to promote deterioration due to overdischarge and overcharge.

In the present embodiment, when it is determined that the switch SW2 during ON operation is stuck, the rotary electric machine control unit 13 changes the respective torque target values T1* and T2* to the lower side by open control. By doing so, the torque of the rotary electric machine 11 is limited. Specifically, during power running, the power running torque target value T1* is changed to a value lower than the power running torque target value T1* when it is determined that the switch SW2 is not stuck. Further, during regenerative power generation, the regenerative torque target value T2* is changed to a value lower than the regenerative torque target value T2* when it is determined that the switch SW2 is not stuck.

Next, a description will be given of the processing in the case where the switch SW1, which is being turned on, has become stuck abnormally during power running. In FIG. 3A , the switch SW1 is in the ON state, and the rotating electric machine 11 is powered by the lead-acid battery 20 . In this state, if the switch SW1 is stuck abnormally, there is a concern that the switch SW1 is temporarily switched from the ON state to the OFF state, and power supply to the rotary electric machine 11 by the lead-acid battery 20 is interrupted.

As shown in FIG. 3B, the battery control unit 31 turns on the switch SW5 and turns off the switch SW2 to electrically connect the lead-acid battery 20 and the rotary electric machine 11 through the bypass path L3. do. As a result, even when the switch SW1 is temporarily switched from the ON state to the OFF state, the electric power of the lead-acid battery 20 is supplied to the rotary electric machine 11 through the bypass path L3.

A fail-safe control will be described in the case where the switch SW1, which is being turned on, is sticking abnormally during regenerative power generation. In this case, switch SW1 is in an ON state, and electric power generated by rotating electric machine 11 is supplied to lead-acid battery 20 through an electric path including switch SW1. In this state, if the battery control unit 31 determines that the switch SW1 is stuck in the ON state, the switch SW5 is turned ON and the switch SW2 is turned OFF. are electrically connected through the bypass path L3. As a result, even when switch SW1 is temporarily switched from the ON state to the OFF state, electric power generated by rotary electric machine 11 is supplied to lead-acid battery 20 through bypass path L3.

When it is determined that the switch SW1 is stuck, the rotating electrical machine control unit 13 limits the torques T1r and T2r of the rotating electrical machine 11 in order to protect the fuse 50 provided in the bypass path L3. In this state, the driving of the rotary electric machine 11 is continued. Specifically, the rotating electrical machine control unit 13 reduces the respective torques T1r and T2r of the rotating electrical machine 11 compared to when it is not determined that the switch SW1 is stuck, thereby connecting the fuse 50 to the bypass path L3. Apply a current lower than the fusing current value for fusing.

In the present embodiment, when the rotary electric machine control unit 13 determines that the switch SW1 during ON operation is stuck abnormally, the torque target values T1* and T2* are changed to the lower side by open control. Thereby, the torques T1r and T2r of the rotary electric machine 11 are restricted. Specifically, during power running, the power running torque target value T1* is changed to a value lower than the power running torque target value T1* when it is not determined that the switch SW1 is stuck. Further, during regenerative power generation, the regenerative torque target value T2* is changed to a value lower than the power running torque target value T1* when it is not determined that the switch SW2 is stuck.

Next, the fail-safe control procedure performed by the battery control unit 31 will be described with reference to FIG. 4 . This process is repeatedly performed by the battery control unit 31 at a predetermined cycle.

In step S11, it is determined whether or not there is an abnormality in the sticking of the switch during the ON operation. In step S12, it is determined whether power running or regenerative power generation is in progress. For example, depending on the type of drive request from the host ECU 80, it is determined that the rotary electric machine 11 is in power running or regenerative power generation.

If the rotary electric machine 11 is in power running or regenerative power generation, the process proceeds to step S13. In step S13, it is determined whether or not the sticking abnormality of the switch SW2 during ON operation is detected in step S11. If it is detected that the switch SW2 is sticking during ON operation, the process proceeds to step S14, and the OFF state switch SW1 is turned ON.

In step S15, when the rotary electric machine 11 is currently powering, the process proceeds to step S16. In step S<b>16 , an abnormality signal indicating the abnormal state of the switch SW<b>2 is transmitted to the rotary electric machine control section 13 through the CAN bus 81 . When the process proceeds to step S16, the abnormality signal indicates that the motor is powering and that the SW2, which is being turned on, has a sticking abnormality.

In step S15, if the rotating electrical machine 11 is currently generating regenerative power, the process proceeds to step S17. The abnormality signal transmitted in step S17 indicates that regenerative power generation is being performed and that SW2, which is being turned on, has a sticking abnormality.

Returning to step S13, if it is determined that the sticking abnormality of the switch SW2 during ON operation is not detected, the process proceeds to step S18. In step S18, it is determined whether or not the sticking abnormality of the switch SW1 during ON operation is detected in step S11. If it is determined that the sticking abnormality of the switch SW1 during ON operation is detected, the process proceeds to step S19.

In step S19, the switch SW5 is turned on and the switch SW2 is turned off. In step S20, if the rotating electrical machine 11 is currently powering, the process proceeds to step S21, and an abnormality signal indicating an abnormal state of the switch SW1 is transmitted to the rotating electrical machine control section 13 via the CAN bus 81. The abnormality signal transmitted in step S21 indicates that the switch SW1, which is being powered and is being turned on, has a stuck abnormality.

In step S20, if the rotating electric machine 11 is currently generating regenerative power, the process proceeds to step S22. The abnormality signal transmitted in step S22 indicates that regenerative power generation is being performed and that the switch SW1, which is being turned on, is stuck.

Returning to step S18, if it is determined that the switch SW1 is not sticking abnormally, the process of FIG. 4 is terminated.

Returning to step S12, if it is determined that the rotary electric machine 11 is not currently in a driving state of power running or regenerative power generation, the process proceeds to step S23. In step S23, in step S11, it is determined whether or not a fixation abnormality of any of the switches SW1 and SW2 during the OFF operation has been detected. If it is determined in step S23 that the sticking abnormality of the switches SW1 and SW2 during the OFF operation is detected, the process proceeds to step S24. In step S<b>24 , it is transmitted to the rotary electric machine control section 13 via the CAN bus 81 that either of the switches SW<b>1 and SW<b>2 during the OFF operation has a sticking abnormality.

Next, a fail-safe control procedure performed by the rotating electrical machine control unit 13 will be described with reference to FIG. 5 . This process is repeatedly performed by the rotary electric machine control unit 13 at a predetermined cycle.

In step S30, the abnormality signal transmitted from the battery control unit 31 through the CAN bus 81 is analyzed. In step S31, if it is determined from the result of analysis of the abnormality signal in step S30 that the switch SW2 is in power running and is being turned on, the process proceeds to step S32. In step S32, the power running torque target value T1* is changed to the decreasing side. As a result, the powering torque T1r is limited so that the terminal voltage of the Li storage battery 30 does not fall below the lower limit of the output voltage range.

If a negative determination is made in step S31, the process proceeds to step S33. In step S33, based on the result of analysis of the abnormality signal in step S30, it is determined whether or not the switch SW1, which is being power-running and is being turned on, has a sticking abnormality. If the determination in step S33 is affirmative, the process proceeds to step S34, and the power running torque target value T1* is changed to the lower side. As a result, the power running torque T1r is limited so that the current flowing through the bypass path L3 does not exceed the fusing current.

If a negative determination is made in step S33, the process proceeds to step S35. In step S35, based on the analysis result of the abnormality signal in step S30, it is determined whether or not the switch SW2 during regenerative power generation and ON operation is stuck abnormally. If the determination in step S35 is affirmative, the process proceeds to step S36 to change the regenerative torque target value T2* to the lower side. As a result, the regenerative torque T2r is limited so that the terminal voltage of the Li storage battery 30 does not exceed the upper limit of the output voltage range.

If a negative determination is made in step S35, the process proceeds to step S37. In step S37, based on the analysis result of the abnormality signal in step S30, it is determined whether or not the switch SW1 during regenerative power generation and ON operation is stuck abnormally. If the determination in step S37 is affirmative, the process proceeds to step S38 to change the regenerative torque target value T2* to the decreasing side. As a result, the regenerative torque T2r is limited so that the current flowing through the bypass path L3 does not exceed the fusing current.

In step S40, it is determined whether or not the period in which the high-level ECU 80 requests power running or regenerative power generation has ended. If it is determined that the requested period has not expired, the process of FIG. 5 is once terminated. In this embodiment, the required period for power running or regenerative power generation corresponds to the drive required period. When step S40 makes an affirmative determination, in step S41, a prohibition request for prohibiting power running and regenerative power generation of the rotary electric machine 11 is transmitted to the host ECU 80 via the CAN bus 81. FIG. Accordingly, the host ECU 80 prohibits the power running and regenerative power generation of the rotary electric machine 11 by changing the prohibition flag to a high state.

On the other hand, if a negative determination is made in step S37, the process proceeds to step S39. In step S39, it is determined whether or not the switches SW1 and SW2 during the OFF operation are sticking abnormally based on the analysis result of the abnormality signal in step S30. If step S39 makes an affirmative determination, the process proceeds to step S41, and a prohibition command is transmitted to the host ECU 80 via the CAN bus 81. FIG.

Next, operations of the battery control unit 31 and the rotary electric machine control unit 13 during fail control will be described using timing charts. FIG. 6 is a timing chart when it is determined that the switch SW2, which is being turned on, is stuck abnormally during power running. FIG. 6(a) shows the transition of presence/absence of the powering request from the host ECU 80, and FIG. 6(b) shows the transition of the powering torque T1r. FIG. 6(c) shows the on/off state of the switch SW1, and FIG. 6(d) shows the on/off state of the switch SW2. FIG. 6(e) shows the ON/OFF state of the switch SW5, and FIG. 6(f) shows changes in the prohibition flag indicating whether or not power running and regenerative power generation of the rotary electric machine 11 are prohibited.

Before the time t1, the higher-level ECU 80 does not issue a powering request, and the powering torque T1r of the rotating electric machine 11 is close to zero. In the example shown in FIG. 6, it is assumed that the switch SW2 is in the ON state before time t1. At time t<b>1 , power running of the rotating electric machine unit 10 is performed in response to a power running request from the host ECU 80 . In FIG. 6B, a period from time t1 to time t4 is a drive request period during which a power running request is made to the rotating electric machine 11. In FIG.

The rotating electrical machine control unit 13 controls the power running torque T1r of the rotating electrical machine 11 to approach the power running torque target value T1*, so that the power running torque T1r reaches the power running torque target value T1 during the period from time t1 to time t2. It rises so that it approaches *. After time t2, the rotating electrical machine control unit 13 maintains the power running torque T1r at the power running torque target value T1*.

At time t3, when the battery control unit 31 determines that the switch SW2 that is being turned on is stuck abnormally, it turns on the switch SW1 that is in the off state. In response to the abnormality signal from the battery control unit 31, the rotating electric machine control unit 13 changes the power running torque target value T1* to a value lower than the current value. As a result, the power running torque T1r of the rotary electric machine 11 becomes lower than the power running torque T1r before it was determined that the switch SW2 during ON operation is stuck.

At time t4, the power running request from the host ECU 80 ends, so that the rotating electrical machine control unit 13 reduces the power running torque target value T1*. Therefore, the power running torque T1r of the rotary electric machine 11 decreases to near zero. Further, the rotary electric machine control unit 13 transmits a prohibition request to the host ECU 80, whereby the prohibition flag for prohibiting the power running and regenerative power generation of the rotary electric machine 11 becomes high, and the power running request and the regenerative power generation request by the host ECU 80 are prohibited. be.

FIG. 7 is a timing chart when it is determined that the switch SW1, which is being turned on, is stuck abnormally during power running. FIGS. 7(a) to 7(f) correspond to FIGS. 6(a) to 6(f), respectively.

Each operation from time t11 to time t12 is the same as the operation from time t1 to time t2 shown in FIG. 6, so description thereof will be omitted. In FIG. 7B, the period from time t11 to time t14 is the drive request period during which power running of the rotating electric machine 11 is requested.

At time t13, when the battery control unit 31 determines that the stuck switch SW1, which is being turned on, has an abnormality, it turns on the switch SW5, which is being turned off. Note that the switch SW2 is turned off. In response to the abnormality signal from the battery control unit 31, the rotating electric machine control unit 13 also changes the power running torque target value T1* to a lower side than the current value. As a result, the power running torque T1r of the rotary electric machine 11 is reduced, so that the current flowing through the bypass path L3 is limited to a value lower than the fusing current of the fuse 50 .

At time t14, the host ECU 80 stops the powering request, so that the rotating electrical machine control unit 13 reduces the powering torque target value T1*. Therefore, the power running torque T1r of the rotary electric machine 11 decreases to near zero. Further, when the rotary electric machine control unit 13 transmits a prohibition request to the host ECU 80, the prohibition flag becomes high, and the power running request and the regenerative power generation request by the host ECU 80 are prohibited.

The following effects can be obtained in this embodiment described above.

The battery control unit 31 determines whether or not the switch SW1 or the switch SW2 that is being turned on has a sticking abnormality during power running or regenerative power generation of the rotary electric machine 11 . When it is determined that a sticking abnormality has occurred in the switch being ON-operated, the OFF-state switch among the switches SW1 and SW2 is operated to the ON state. Then, the rotating electrical machine control unit 13 continues driving the rotating electrical machine 11 while limiting the torque. As a result, even if a sticking abnormality occurs in a switch that is being turned on, the rotary electric machine 11 and each of the storage batteries 20 and 30 can be electrically connected by a switch other than this switch. Appropriate measures can be taken for the rotating electric machine 11 without causing

The rotary electric machine control unit 13 continues to restrict the drive of the rotary electric machine 11 due to the sticking abnormality of the switch during the ON operation, and then prohibits the drive of the rotary electric machine 11 . As a result, it is possible to prevent the rotary electric machine 11 from being driven again in a state in which the switch that is being turned on is sticking abnormally.

The rotary electric machine control unit 13 prevents the terminal voltage of the Li storage battery 30 from deviating from a predetermined output voltage range when the rotary electric machine 11 continues to be driven in a state where the switch SW2 is stuck during ON operation. In addition, the torques T1r and T2r of the rotary electric machine 11 are limited. As a result, the rotating electrical machine 11 can continue to be driven while suppressing deterioration of the Li storage battery 30 .

When the battery control unit 31 determines that the sticking abnormality has occurred in the switch SW1 that is being turned on, the battery control unit 31 turns on the switch SW5 to connect the lead-acid battery 20 and the lead-acid battery 20 through the bypass route L3 without going through the switch SW1. The electrical connection with the rotating electric machine 11 is continued. Further, the rotary electric machine control unit 13 limits the torques T1r and T2r of the rotary electric machine 11 so that the current flowing through the bypass path L3 is smaller than the blowing current blowing the fuse 50 . As a result, even when the switch SW1 is stuck during ON operation, the electrical connection between the lead-acid battery 20 and the rotating electrical machine 11 is maintained, and the driving of the rotating electrical machine 11 is stably continued. can be done.

(Other embodiments)
The battery control unit 31 may turn on the switch SW2 when it is determined that the switch SW1, which is being turned on, has a sticking abnormality. In this case, the switch SW2 should be turned on in step S19 of FIG. As a result, the rotating electric machine 11 and the Li storage battery 30 are electrically connected via the switch SW2. is supplied to the rotating electric machine 11 . Further, during regenerative power generation, electric power generated by the rotary electric machine 11 is supplied to the Li storage battery 30 even when the switch SW1 is temporarily changed from the ON state to the OFF state.

The fusing part provided in the bypass path L3 may be any one other than a fuse as long as it is fused by a current greater than a predetermined fusing current. For example, in the bypass route L3, a part of the bypass route L3 whose width is narrower than that of the rest of the route and which is melted due to heat generated by overcurrent may be used as the melted portion.

- The in-vehicle power supply system 100 may have a configuration in which a resistance unit is provided on the bypass route L3 instead of the configuration in which the switch SW5 is provided on the bypass route L3. In this case, the battery control unit 31 may turn on the switch SW2 when it determines that the sticking abnormality has occurred in the switch SW1 that is being turned on.

・After receiving the abnormal signal from the battery control unit 31, the rotary electric machine control unit 13 may instruct the battery control unit 31 to turn on and off the switches SW1 to SW3 according to the analysis result of the received abnormal signal. good.

- Instead of configuring the control device with the battery control unit 31 and the rotary electric machine control unit 13, one control device may have the functions of both the battery control unit 31 and the rotary electric machine control unit 13. .

DESCRIPTION OF SYMBOLS 11... Rotary electric machine 20... Lead storage battery 30... Li storage battery 31... Battery control part 13... Rotating electric machine control part 100... Vehicle-mounted power supply system.

Claims (4)

a rotating electric machine (11);
a first storage battery (20) and a second storage battery (30) connected in parallel to the rotating electric machine;
a first switch (SW1) for switching electrical connection between the rotating electric machine and the first storage battery;
a second switch (SW2) for switching electrical connection between the rotating electric machine and the second storage battery;
applied to an in-vehicle power supply system (100) comprising
A control device (13, 31) for turning on at least one of the first switch and the second switch when driving either power running or power generation of the rotating electric machine,
When either the first switch or the second switch is turned on and the rotating electric machine is driven, it is determined whether or not the switch in the on state has a sticking abnormality. an abnormality determination unit that determines;
when it is determined that the sticking abnormality has occurred, turning on the off-state switch of the first switch and the second switch within the drive request period of the rotating electric machine at that time, and a fail-safe control unit that continues while limiting the driving of the rotating electric machine;
A control device for an in-vehicle power supply system. The fail-safe control unit prohibits subsequent driving of the rotating electrical machine after completing the driving of the rotating electrical machine within the drive request period during which the abnormality determining section determines that the fixation abnormality has occurred. 2. The controller for an on-vehicle power supply system according to claim 1. The second storage battery is a lithium ion storage battery, the first storage battery is a lead storage battery,
When the first switch is turned on because it is determined that the second switch is stuck, the fail-safe control unit causes the voltage between the terminals of the second storage battery to fall within a predetermined output voltage range. 3. The controller for an in-vehicle power supply system according to claim 1, wherein the rotating electric machine is continued to be driven while limiting it to fit. The in-vehicle power supply system includes a third switch (SW5) provided in a bypass path (L3) connecting the rotating electric machine and the first storage battery without passing through the first switch,
The bypass path is provided with a fusing portion (50) that is fused when a current larger than a predetermined fusing current flows,
The fail-safe control unit turns on the first switch when it is determined that the second switch is stuck, and determines that the first switch is stuck. When the third switch is turned on and the current flowing through the bypass path is restricted to be smaller than the fusing current, the rotating electric machine is continued to be driven. The controller for an in-vehicle power supply system according to any one of Claims 1 to 3.

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