JP7124396B2 - power supply - Google Patents

Description

The present invention relates to a power supply device.

Conventionally, this type of power supply device includes a power storage device, a charging inlet connected to the power storage device via a power line and to an external power source via a charging cable, a charger provided on the power line, A proposal has been made of a relay that is provided closer to the power storage device than the charger, and a control device that controls the charger and the relay (see Patent Document 1, for example).

WO2013/042216

In the power supply device described above, if an abnormality occurs in the first control device that controls the relay, there is a possibility that the relay cannot be cut off. For this reason, in order to cope with an abnormality in the first control device, the second control device, which is different from the first control device, forcibly turns on the relay through the signal line for disconnection without going through the first control device. It is conceivable to make it possible to block In this case, the problem is how to diagnose whether or not the disconnection signal line is normal.

A main object of the power supply device of the present invention is to make it possible to diagnose whether or not the cutoff signal line is normal.

The power supply device of the present invention employs the following means in order to achieve the above main object.

The power supply device of the present invention is
a power storage device;
a connection unit connected to the power storage device via a power line and connected to an external power supply;
a relay provided in the power line;
a driver circuit that connects or disconnects the relay;
a first control unit and a second control unit;
A power supply device comprising:
The first control unit outputs a connection command or a disconnection command for the relay,
The second control unit is capable of outputting a forced cutoff command for the relay to the cutoff signal line,
The driver circuit connects or disconnects the relay based on the connection command or the disconnection command from the first control unit when the forced disconnection command is not output to the disconnection signal line, and When the forced cutoff command is output to the cutoff signal line, the relay is cut off,
Further, when the first control unit or the second control unit outputs a forced cutoff command from the second control unit to the cutoff signal line and outputs the connection command from the first control unit, the Diagnosing whether the signal line for breaking is normal based on the potential of the signal line for breaking or the state of the relay;
This is the gist of it.

In the power supply device of the present invention, the first control unit outputs a relay connection command or a relay disconnection command, the second control unit can output a relay forced disconnection command to the disconnection signal line, and the driver circuit , when the forced cutoff command is not output to the cutoff signal line, the relay is placed in the connected state or the cutoff state based on the connection command or cutoff command from the first control unit, and the forced cutoff command is output to the cutoff signal line. , the relay is cut off. Furthermore, the first control unit or the second control unit outputs a forced cutoff command to the cutoff signal line from the second control unit and outputs a connection command from the first control unit, the potential of the cutoff signal line or Based on the state of the relay, a diagnosis is made as to whether or not the cutoff signal line is normal. In this way, it is possible to diagnose whether or not the cutoff signal line is normal.

In the power supply device of the present invention, a switching element that turns on when the forced cutoff command is output to the cutoff signal line and turns off when the forced cutoff command is not output to the cutoff signal line; and a diode whose anode is connected to a signal line connecting the 1 control unit and the driver circuit and whose cathode is grounded via the switching element.

1 is a configuration diagram showing an outline of the configuration of a power supply device 20 as one embodiment of the present invention; FIG. 4 is a flowchart showing an example of a processing routine executed by a main microcomputer 51 of a main ECU 50; FIG. 11 is a flow chart showing an example of a processing routine of a modified example; FIG.

Next, a mode for carrying out the present invention will be described using examples.

FIG. 1 is a configuration diagram showing an outline of the configuration of a power supply device 20 as one embodiment of the present invention. The power supply device 20 is installed in an electric vehicle equipped with a motor for running or a hybrid vehicle equipped with an engine in addition to the motor for running. , a charging electronic control unit (hereinafter referred to as "charging ECU") 36, a charging relay CHR, a battery electronic control unit (hereinafter referred to as "battery ECU") 40, and a main electronic control unit (hereinafter referred to as " (referred to as "main ECU") 50.

The battery 22 is configured as, for example, a lithium-ion secondary battery or a nickel-hydrogen secondary battery, exchanges power with a motor (not shown), and is connected to a power line 24 . The connector 26 is connected to the power line 24 and is connectable to an AC external power supply (not shown).

Charger 30 is provided between battery 22 and connector 26 in power line 24 and includes AC/DC converter 31 , DC/DC converter 32 , and capacitor 33 . The AC/DC converter 31 converts AC power on the connector 26 (external power supply) side into DC power. The DC/DC converter 32 converts the voltage of the AC power from the AC/DC converter 31 . The capacitor 33 is attached closer to the battery 22 than the DC/DC converter 32 in the power line 24 .

The charging ECU 36 includes a microcomputer (hereinafter referred to as "charging microcomputer") 37. The charging microcomputer 37 includes a CPU, ROM, RAM, nonvolatile memory (for example, flash memory), input/output port, and communication port (not shown). have The charging microcomputer 37 receives the voltage of the capacitor 33 (power line 24) from the voltage sensor 34 attached between the terminals of the capacitor 33 and the like through the input port. The charging microcomputer 37 outputs control signals to the AC/DC converter 31 and the DC/DC converter 32 through the output port. The charging microcomputer 37 is connected to a microcomputer (hereinafter referred to as "battery microcomputer") 41 provided in the battery ECU 40, a microcomputer (hereinafter referred to as "main microcomputer") 51 provided in the main ECU 50, and a communication line (for example, CAN communication). communication line) 64.

Charging relay CHR is provided between battery 22 and capacitor 33 on power line 24 . This charging relay CHR has a positive side relay CHRB provided on the positive side line of power line 24 and a negative side relay CHRG provided on the negative side line of power line 24 . The positive relay CHRB and the negative relay CHRG are connected when the corresponding excitation circuit is driven (energized), and are released when the excitation circuit is stopped (non-energized).

The battery ECU 40 includes a battery microcomputer 41, driver circuits 42 and 43, a switching element 46, and diodes 48 and 49. When the potential of the signal line 44 is at Hi level, the driver circuit 42 drives the excitation circuit of the positive electrode side relay CHRB to connect the positive electrode side relay CHRB. The excitation circuit of the relay CHRB is stopped, and the positive side relay CHRB is cut off. When the potential of the signal line 45 is at Hi level, the driver circuit 43 drives the excitation circuit of the negative relay CHRG to connect the negative relay CHRG. The excitation circuit of the relay CHRG is stopped, and the negative electrode side relay CHRG is cut off.

The switching element 46 has a base connected to the main microcomputer 51 of the main ECU 50 via a signal line 60, a collector connected to the signal lines 44 and 45 via diodes 48 and 49, and an emitter grounded. The diode 48 has an anode connected to the signal line 44 and a cathode grounded to the collector of the switching element 46 . The diode 49 has an anode connected to the signal line 45 and a cathode grounded to the collector of the switching element 46 .

The battery microcomputer 41 has a CPU, ROM, RAM, nonvolatile memory, input/output ports, and communication ports (not shown). Various signals are input to the battery microcomputer 41 through an input port. The signals input to the battery microcomputer 41 include, for example, the voltage Vb of the battery 22 from the voltage sensor 22a attached between the terminals of the battery 22, and the voltage Vb of the battery 22 from the current sensor 22b attached to the output terminal of the battery 22. , the current Ib can be mentioned. In addition, the potential (signal level) of the signal line 60 and the state (driving state, stopped state) of the excitation circuit of the positive electrode side relay CHRB and the negative electrode side relay CHRG can also be mentioned. The battery microcomputer 41 is connected to the driver circuits 42 and 43 via the signal lines 44 and 45, and outputs connection commands and disconnection commands of the positive side relay CHRB and the negative side relay CHRG to the signal lines 44 and 45 via the output port. output. The connection command and disconnection command for the positive relay CHRB and the negative relay CHRG are Hi level or Lo level signals in the logic level. did. The battery microcomputer 41 calculates the state of charge SOC of the battery 22 based on the current Ib of the battery 22 from the current sensor 22b. The battery microcomputer 41 is connected to the charging microcomputer 37 provided in the charging ECU 36 and the main microcomputer 51 provided in the main ECU 50 via a communication line 64 .

The main ECU 50 includes a main microcomputer 51. The main microcomputer 51 has a CPU, ROM, RAM, nonvolatile memory, input/output ports, and communication ports (not shown). The main microcomputer 51 is connected to the base of the switching element 46 of the battery ECU 40 via a signal line 60 and outputs to the signal line 60 a connection permission command and a forced disconnection command for the positive relay CHRB and the negative relay CHRG. The connection permission command and the forced disconnection command for the positive relay CHRB and the negative relay CHRG are logic level Hi or Lo level signals. level signal. The main microcomputer 51 is connected to the charging microcomputer 37 provided in the charging ECU 36 , the battery microcomputer 41 provided in the battery ECU 40 , and the like via communication lines 64 .

In the power supply device 20 configured in this manner, the battery ECU 40 turns off the switching element 46 when the potential of the signal line 60 is at the Lo level (when the main microcomputer 51 outputs a connection permission command), and the diode 48, 49 is turned off, and the potentials (signal levels) of the signal lines 44 and 45 become the potentials corresponding to the connection command and disconnection command from the battery microcomputer 41 for the positive side relay CHRB and the negative side relay CHRG. Therefore, the driver circuits 42 and 43 drive or stop the excitation circuits of the positive relay CHRB and the negative relay CHRG in accordance with connection commands and disconnection commands for the positive relay CHRB and the negative relay CHRG from the battery microcomputer 41 . , and the positive relay CHRB and the negative relay CHRG are connected or disconnected.

When the potential of the signal line 60 is at Hi level (when the main microcomputer 51 outputs a forced shutdown command), the battery ECU 40 turns on the switching element 46, and the potentials of the signal lines 44 and 45 are at Lo level. In this case, the diodes 48 and 49 are turned off, and when the potentials of the signal lines 44 and 45 are about to go to Hi level, the diodes 48 and 49 are turned on and the potentials (signal levels) of the signal lines 44 and 45 go to Lo level. Become. Therefore, the driver circuits 42 and 43 stop the excitation circuits of the positive relay CHRB and the negative relay CHRG regardless of the connection command or disconnection command for the positive relay CHRB and the negative relay CHRG from the battery microcomputer 41 ( (maintained in the stopped state), and the positive electrode side relay CHRB and the negative electrode side relay CHRG are cut off (maintained in the cutoff state).

Next, the operation of the power supply device 20 of the embodiment configured as described above, in particular, the operation of diagnosing whether the signal line 60 is normal will be described. FIG. 2 is a flowchart showing an example of a processing routine executed by the main microcomputer 51 of the main ECU 50. As shown in FIG. In this routine, the connector 26 is connected to an AC external power supply, and a charge switch provided in the external power supply is operated to charge the battery 22 using power from the external power supply. is executed when instructed to do so.

When the processing routine of FIG. 2 is executed, the main microcomputer 51 outputs a forced shutdown command to the signal line 60 , that is, sets the signal line 60 to Hi level, and also sends the battery microcomputer 41 to the positive terminal via the communication line 64 . A connection command for the side relay CHRB is transmitted (step S100). When the battery microcomputer 41 receives the connection command for the positive electrode side relay CHRB, it outputs the connection command to the signal line 44, that is, tries to set the signal line 44 to Hi level. However, when the signal line 60 is normally at Hi level, the potential (signal level) of the signal line 44 becomes Lo level (maintained at Lo level), and the driver circuit 42 holds the excitation circuit of the positive relay CHRB in a stopped state. be done.

Subsequently, it is determined whether or not there is a history that the excitation circuit of the positive electrode side relay CHRB has been driven (steps S110 and S112). (step S120), and when the provisional abnormality determination time T1 has not elapsed, the process returns to step S110. Whether or not there is a history that the excitation circuit of the positive electrode side relay CHRB has been driven is determined by inputting the behavior of the output (potential) of the driver circuit 42 monitored by the battery microcomputer 41 from the battery microcomputer 41 via the communication line 64 by communication. can be determined by For example, 100 msec, 200 msec, 300 msec, or the like is used as the temporary abnormality determination time T1.

When it is determined in steps S110 and S112 that there is a history that the excitation circuit of the positive electrode side relay CHRB has been driven, after waiting for the elapse of the abnormality confirmation time T2 (step S130), the potential of the signal line 60 is normal. It is determined whether or not (step S140), and whether or not the positive electrode side relay CHRB connection relation is normal (step S150). Here, 1 sec, 2 sec, 3 sec, or the like is used as the abnormality determination time T2.

The process of step S140 includes, for example, the output from the main microcomputer 51 to the signal line 60 (forced shutdown command, that is, Hi level) and the signal line monitored by the battery microcomputer 41 and input by communication via the communication line 64. This is done by comparing the potentials of 60 and . When the two do not match, it can be considered that the potential of the signal line 60 is abnormal due to an abnormality in the signal line 60, the battery ECU 40, the main ECU 50, or the like.

The processing in step S150 includes, for example, the potential of the signal line 60 monitored by the battery microcomputer 41, the output from the battery microcomputer 41 to the signal line 44, and the output of the driver circuit 42 monitored by the battery microcomputer 41 (positive side relay state of the excitation circuit of the SMRB) is input from the battery microcomputer 41 via the communication line 64 and compared. If the three combinations are not correct, it means that there is an abnormality related to the connection of the positive relay CHRB, specifically, the signal line 44, the excitation circuit of the positive relay CHRB, the positive relay CHRB, the switching element 46, and the diode 48. can think.

When it is determined in step S140 that there is an abnormality in the potential of the signal line 60, or when it is determined in step S150 that there is an abnormality in the connection of the positive electrode side relay CHRB, the warning light is turned on and displayed on the display. The abnormality is notified by voice output or the like (step S160), and the routine ends. In this case, it is preferable to store in the non-volatile memory of the main microcomputer 51 including classification of whether the potential abnormality of the signal line 60 or the abnormality related to the connection of the positive electrode relay CHRB.

When it is determined in step S140 that the potential of the signal line 60 is normal and in step S150 it is determined that the connection of the positive electrode side relay CHRB is normal, the positive electrode side relay is temporarily It is determined that the excitation circuit of CHRB has just entered the driving state. Further, when it is determined in step S120 that the tentative abnormality determination time T1 has elapsed after repeatedly executing the processes of steps S110 to S120, it is determined that there is no history of the excitation circuit of the positive electrode side relay CHRB being driven, and the signal It is determined that the potential of the line 60 and the connection of the positive relay CHRB are normal.

In these cases, the battery microcomputer 41 is sent a command to disconnect the positive relay CHRB through the communication line 64 (step S170), and then a command to connect the positive relay CHRB is sent to the battery microcomputer 41 through the communication line 64. Send (step S180). When the battery microcomputer 41 receives the cutoff command for the positive electrode side relay CHRB, it outputs the cutoff command to the signal line 44, that is, sets the signal line 44 to Lo level. Further, when the battery microcomputer 41 receives the connection command for the negative relay CHRG, it outputs the connection command to the signal line 45, that is, tries to bring the signal line 45 to the Hi level. However, when the signal line 60 is normally at Hi level, the potential (signal level) of the signal line 45 becomes Lo level (maintained at Lo level), and the excitation circuit of the negative electrode side relay CHRG is held in a stopped state by the driver circuit 43. be done.

Subsequently, it is determined whether or not there is a history that the excitation circuit of the negative electrode side relay CHRG has been driven (steps S190 and S192). (step S200), and if the temporary abnormality determination time T1 has not elapsed, the process returns to step S190. Whether or not there is a history that the exciting circuit of the negative electrode side relay CHRG has been driven is determined by inputting the behavior of the output (potential) of the driver circuit 43 monitored by the battery microcomputer 41 from the battery microcomputer 41 via the communication line 64. can be determined by

When it is determined in steps S190 and S192 that there is a history that the excitation circuit of the negative electrode side relay CHRG has been in a driven state, the potential of the signal line 60 is lowered after the elapse of the abnormality determination time T2 (step S210). It is determined whether or not it is normal (step S220), and it is determined whether or not the negative electrode side relay CHRG connection is normal (step S230). The process of step S220 is performed in the same manner as the process of step S130 described above.

The processing in step S230 includes, for example, the potential of the signal line 60 monitored by the battery microcomputer 41, the output from the battery microcomputer 41 to the signal line 45, and the output of the driver circuit 43 (negative side relay) monitored by the battery microcomputer 41. state of the excitation circuit of the SMRG) is input from the battery microcomputer 41 via the communication line 64 and compared. If the three combinations are not correct, it means that there is an abnormality related to the connection of the negative relay CHRG, specifically, the signal line 45, the excitation circuit of the negative relay CHRG, the negative relay CHRG, the switching element 46, and the diode 48. can think.

When it is determined in step S220 that there is an abnormality in the potential of the signal line 60, or when it is determined in step S230 that there is an abnormality in the connection of the negative electrode side relay CHRG, the warning light is turned on and displayed on the display. The abnormality is notified by voice output or the like (step S240), and this routine ends. In this case, it is preferable to store in the non-volatile memory of the main microcomputer 51 including the distinction between the potential abnormality of the signal line 60 and the abnormality related to the connection of the negative electrode relay CHRG.

When it is determined in step S220 that the potential of the signal line 60 is normal and in step S230 it is determined that the connection of the negative relay CHRG is normal, the negative relay is temporarily turned off due to noise or the like in steps S190 and S192. It is determined that the excitation circuit of CHRG has just entered the driving state. Further, when it is determined in step S200 that the provisional abnormality determination time T1 has elapsed after repeatedly executing the processing of steps S190 to S200, it is determined that there is no history of the excitation circuit of the negative electrode side relay CHRG being driven, and the signal It is determined that the potential of the line 60 and the connection of the negative relay CHRG are normal.

At these times, a command to cut off the negative electrode side relay CHRG is transmitted to the battery microcomputer 41 via the communication line 64 (step S250). When the battery microcomputer 41 receives the cutoff command for the negative relay CHRG, it outputs the cutoff command to the signal line 45, that is, sets the signal line 45 to Lo level.

Subsequently, a connection permission command is output to the signal line 60, that is, the signal line 60 is set to Lo level (step S260), the connection sequence of the charging relay CHR is executed (step S270), and this routine ends. In the connection sequence of the charging relay CHR, the main microcomputer 51 transmits a connection command of the positive side relay CHRB and the negative side relay CHRG to the battery microcomputer 41 via the communication line 64, and the battery microcomputer 41 connects the positive side relay CHRB and the negative side relay CHRG. Upon receiving the connection command for the side relay CHRG, the connection command is output to the signal lines 44 and 45, that is, the signal lines 44 and 45 are set to Hi level. Then, driver circuits 42 and 43 drive the excitation circuits of positive electrode side relay CHRB and negative electrode side relay CHRG, and positive electrode side relay CHRB and negative electrode side relay CHRG are connected. After that, external charging is performed to charge battery 22 using power from the external power supply.

In the power supply device 20 of the embodiment described above, when the main microcomputer 51 outputs a forced cutoff command to the signal line 60 and outputs a connection command for the positive relay CHRB from the battery microcomputer 41 to the signal line 44, By comparing the output from the main microcomputer 51 to the signal line 60 with the potential of the signal line 60 monitored by the battery microcomputer 41, it is possible to diagnose whether (the potential of) the signal line 60 is normal. .

In the power supply device 20 of the embodiment, the main microcomputer 51 outputs a forced cutoff command to the signal line 60, and the battery microcomputer 41 transmits the signal line 44 (signal line 45) to the positive electrode side relay CHRB (negative electrode side relay CHRG). ) is output from the main microcomputer 51 to the signal line 60, and the potential of the signal line 60 monitored by the battery microcomputer 41 is compared to determine whether the potential of the signal line 60 is normal. shall be judged. However, at this time, the output from the main microcomputer 51 to the signal line 60 is compared with the state of the excitation circuit of the positive electrode side relay SMRB (negative electrode side relay SMRG) and the state of the positive electrode side relay SMRB (negative electrode side relay SMRG). By doing so, it may be determined whether the potential of the signal line 60 is normal.

In the power supply device 20 of the embodiment, the main microcomputer 51 determines whether or not the potential of the signal line 60 is normal. good.

In the power supply device 20 of the embodiment, the main microcomputer 51 executes the processing routine of FIG. 2, but instead of this, it may execute the processing routine of FIG. The processing routine of FIG. 3 is the same as the processing routine of FIG. 2 except that the processing of steps S140b and S220b is executed instead of the processing of steps S140, S150, S220 and S230. Therefore, the same step numbers are assigned to the same processes, and detailed description thereof will be omitted.

In the processing routine of FIG. 3, when it is determined in steps S110 and S112 that there is a history that the excitation circuit of the positive electrode side relay CHRB has been driven, the process waits until the abnormality determination time T2 elapses (step S130), and the signal It is determined whether the function of the line 60 is normal (step S140b). The process of step S140b includes output from the main microcomputer 51 to the signal line 60 (forced shutdown command, that is, Hi level), output from the battery microcomputer 41 input via the communication line 64 to the signal line 44, and It is monitored by the microcomputer 41 and compared with the output of the driver circuit 42 input via the communication line 64 (the state of the excitation circuit of the positive electrode side relay SMRB). If the three combinations are not correct, the signal line 60, the battery microcomputer 41, the main microcomputer 51, the signal line 44, the excitation circuit of the positive electrode side relay CHRB, the positive electrode side relay CHRB, the switching element 46, and the diode 48 are abnormal. 60 malfunctions can be considered to have occurred.

When it is determined in step S140b that the signal line 60 is malfunctioning, the process proceeds to step S160, and when it is determined that the function of the signal line 60 is normal, the process proceeds to step S170.

When it is determined in steps S190 and S192 that there is a history that the excitation circuit of the negative relay CHRG has been driven, after the above-mentioned abnormality determination time T2 elapses (step S210), similar to step S130, It is determined whether or not the function of the signal line 60 is normal (step S220b). When it is determined that the signal line 60 is malfunctioning, the process proceeds to step S240, and when it is determined that the function of the signal line 60 is normal, the process proceeds to step S250. Even in this case, it is possible to diagnose whether the signal line 60 is normal.

In the power supply device 20 of the embodiment, the battery 22 is used as the power storage device, but instead of this, a capacitor may be used.

The correspondence relationship between the main elements of the embodiments and the main elements of the invention described in the column of Means for Solving the Problems will be described. In the embodiment, the battery 22 corresponds to the "storage device", the connector 26 corresponds to the "connection part", the charging relay CHR having the positive side relay CHRB and the negative side relay CHRG corresponds to the "relay", and the driver The circuits 42 and 43 correspond to the "driver circuit", the battery microcomputer 41 corresponds to the "first control section", and the main microcomputer 51 corresponds to the "second control section".

Note that the correspondence relationship between the main elements of the examples and the main elements of the invention described in the column of Means for Solving the Problems is the Since it is an example for specifically explaining the mode for solving the problem, it does not limit the elements of the invention described in the column of the means for solving the problem. That is, the interpretation of the invention described in the column of Means to Solve the Problem should be made based on the description in that column, and the Examples are based on the description of the invention described in the column of Means to Solve the Problem. This is only a specific example.

Although the embodiments for carrying out the present invention have been described above, the present invention is not limited to such embodiments at all, and can be modified in various forms without departing from the scope of the present invention. Of course, it can be implemented.

INDUSTRIAL APPLICABILITY The present invention is applicable to the power supply manufacturing industry and the like.

20 power supply device, 22 battery, 22a voltage sensor, 22b current sensor, 24 power line, 26 connector, 30 charger, 31 AC/DC converter, 32 DC/DC converter, 33 capacitor, 34 voltage sensor, 36 charging ECU, 37 Charging microcomputer 40 Battery ECU 41 Battery microcomputer 42, 43 Driver circuit 44, 45, 60 Signal line 46 Switching element 48, 49 Diode 50 Main ECU 51 Main microcomputer 64 Communication line.

Claims (1)

a power storage device;
a connection unit connected to the power storage device via a power line and connected to an external power supply;
a relay provided in the power line;
a driver circuit that outputs to connect or disconnect the relay;
a first control unit and a second control unit;
A power supply device comprising:
The first control unit outputs a connection command or a disconnection command of the relay to a signal line,
The second control unit is capable of outputting a forced cutoff command for the relay to the cutoff signal line,
The driver circuit connects the relay based on the connection command or the disconnection command from the first control unit via the signal line when the forced disconnection command is not output to the disconnection signal line. or outputting to cut off the relay, and when the forced cutoff command is output to the cutoff signal line, outputting to cut off the relay,
Further, when the first control unit or the second control unit outputs a forced cutoff command from the second control unit to the cutoff signal line and outputs the connection command from the first control unit, the Diagnosing whether the signal line for breaking is normal based on the potential of the signal line for breaking;
Power supply.

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