JP7020191B2 - In-vehicle power supply - Google Patents

Description

The present invention relates to an in-vehicle power supply device that charges a battery with electric power from an external power source.

Conventionally, as this type of in-vehicle power supply device, the system main relay attached to the power line from the storage battery to the inverter and the inlet to which the external power supply connector is connected to charge the inverter side of the power line system main relay. A charging relay attached to a wire and a voltage sensor for detecting the voltage of the path from the inlet to the charging relay have been proposed (see, for example, Patent Document 1). In this power supply device, when the rapid charging is completed, in order to determine the welding failure of the charging relay, both the positive electrode side and the negative electrode side of the charging relay are turned off while the system main relay is on controlled, and then charging is performed. Only one pole of the positive electrode side and the negative electrode side of the relay is on-controlled. At this time, when the voltage detected by the voltage sensor is fixed to the Hi state, it is judged that there is a possibility of bipolar welding, and it is confirmed that the connector is not connected to the inlet, and the system main relay is turned off. do. Then, when the voltage detected by the voltage sensor does not change in the Hi state even by the off control of the system main relay, it is determined that the voltage sensor has failed, and when it changes to the Lo state, bipolar welding has occurred. judge.

Japanese Unexamined Patent Publication No. 2016-174468

In the above-mentioned vehicle-mounted power supply device, by controlling the on / off of the system main relay in a state where the connector is not connected to the inlet, it is possible to prevent erroneous determination when determining welding of both poles of the charging relay. However, no consideration is given to preventing erroneous determination when determining the welding of one pole of the charging relay while the connector is connected to the inlet.

The main object of the vehicle-mounted power supply device of the present invention is to prevent erroneous determination when determining welding of one pole of a charging relay in a state where an inlet is connected to an external power supply connector.

The vehicle-mounted power supply device of the present invention has adopted the following means in order to achieve the above-mentioned main object.

The vehicle-mounted power supply device of the present invention is
From the battery, the system main relay attached to the power line from the battery to the vehicle drive, and the inlet to which the external power supply connector is connected to the vehicle drive side of the power line from the system main relay. A charging relay attached to the positive electrode side and the negative electrode side of the charging line, a voltage sensor for detecting the voltage between the positive and negative electrodes between the inlet and the charging relay of the charging line, the system main relay and the above. An in-vehicle power supply device including a control device for controlling a charging relay.
When a predetermined determination execution condition including that the external power supply connector is connected to the inlet is satisfied, the control device controls off the system main relay and turns off the positive voltage side and the negative voltage side of the charging relay. Then, a bipolar welding determination is executed to determine whether or not both poles of the charging relay are welded depending on whether or not the voltage detected by the voltage sensor is less than the predetermined voltage, and the detected voltage is less than the predetermined voltage. If it is determined that the voltage is determined to be, the voltage detected by the voltage sensor is controlled by turning off the system main relay, turning on one of the positive and negative relays of the charging relay, and turning off the other relay. The system executes a unipolar welding determination for determining whether or not the other relay is welded depending on whether or not is less than a predetermined voltage, and between the start of the unipolar welding determination and the determination of the determination. When the main relay is turned on and the positive and negative sides of the charging relay are turned off and a voltage equal to or higher than a predetermined voltage is detected by the voltage sensor, the execution of the one-pole welding determination is stopped.
The gist is that.

In the vehicle-mounted power supply device of the present invention, when a predetermined determination execution condition including the connection of the external power supply connector to the inlet is satisfied, the bipolar welding determination and the unipolar welding determination are executed. The bipolar welding determination is performed by controlling the system main relay to be off and controlling the positive electrode side and the negative electrode side of the charging relay to be off to determine whether or not the voltage detected by the voltage sensor is less than a predetermined voltage. In the unipolar welding determination, when the voltage detected in the bipolar welding determination is less than a predetermined voltage, the system main relay is turned off and one of the positive and negative sides of the charging relay is turned on and the other. This is performed by controlling the relay off and determining whether or not the voltage detected by the voltage sensor is less than a predetermined voltage. Then, between the start of the one-pole welding judgment and the time when the judgment is confirmed, the system main relay is turned on and the positive electrode side and the negative electrode side of the charging relay are turned off, and a voltage higher than a predetermined voltage is generated by the voltage sensor. When it is detected, the execution of the unipolar welding determination is stopped. As a result, even if a voltage is applied to the inlet from the external power source for some reason during the execution of the unipolar welding determination, it is possible to detect this and stop the execution of the unipolar welding determination. As a result, it is possible to prevent erroneous determination of unipolar welding. Here, the predetermined determination execution conditions include those that are satisfied when the external power supply connector is connected to the inlet in a state where the execution of the bipolar welding determination or the unipolar welding determination has not been completed normally last time. included.

It is a block diagram which shows the outline of the structure of the power supply device 20 for a vehicle as an embodiment of the present invention. It is a flowchart which shows an example of the welding diagnosis processing routine at the time of connector connection. It is explanatory drawing which shows the state of time change of the connector connection state, applied voltage Vdc, system main relay SMRB, SMRG and charge relay DCRB, DCRG state in welding diagnosis processing.

Next, an embodiment for carrying out the present invention will be described with reference to examples.

FIG. 1 is a configuration diagram showing an outline of the configuration of an in-vehicle power supply device 20 as an embodiment of the present invention. The power supply device 20 of the embodiment is mounted on a vehicle such as an electric vehicle or a hybrid vehicle, and functions as a power source for a traveling motor or the like. In the embodiment, for the sake of simplicity, it is assumed that the power supply device 20 is mounted as a power source for the hybrid vehicle. As shown in FIG. 1, the power supply device 20 of the embodiment includes an inlet 21, a charging relay DCRB, a DCRG, a battery 30, a charging electronic control unit (hereinafter referred to as a charging ECU) 24, and a battery electron. A control unit (hereinafter referred to as a battery ECU) 34 and a hybrid electronic control unit (hereinafter referred to as an HVECU) 40 are provided.

The inlet 21 is connected to the battery 30 by a charging line 22. When the connector 11 of the quick charging facility 10 as an external power source is connected to the inlet 21, the power supply device 20 directly inputs a high voltage DC voltage from the quick charging facility 10 to quickly charge the battery 30. It is configured. Charging relays DCRB and DCRG are attached to the positive electrode side and the negative electrode side of the charging line 22, respectively, and the charging relays DCRB and DCRG are turned on by the charging ECU 24 to transfer the electric power from the quick charging equipment 10 to the battery 30 side. Supply.

Although not shown, the charging ECU 24 is configured as a microprocessor centered on a CPU, and includes a ROM for storing a processing program, a RAM for temporarily storing data, an input / output port, a communication port, and the like, in addition to the CPU. .. The charging ECU 24 has a connection signal from the connection switch 21a for determining whether or not the connection connector 11 of the quick charging facility 10 is connected to the inlet 21, and between the inlet 21 of the charging line 22 and the charging relays DCRB and DCRG. The applied voltage Vdc or the like from the voltage sensor 25 attached between the positive and negative electrodes is input via the input port. Further, from the charging ECU 24, a drive signal or the like for turning on / off the charging relays DCRB and DCRG, respectively, is output via the output port. The charging ECU 24 is communicably connected to the quick charging equipment 10 when the connection connector 11 is connected to the inlet 21, and transmits a charging start command instructing the quick charging equipment 10 to start charging, or the battery 30. The state is transmitted, or a charge stop command instructing the quick charging facility 10 to stop charging when the battery 30 is abnormal is transmitted. Further, the charging ECU 24 communicates with the HVECU 40, and transmits the information obtained by the charging ECU 24 to the HVECU 40 as needed.

The battery 30 is configured as, for example, a lithium ion secondary battery, and is connected to a drive device such as an inverter INV that drives a traveling motor (not shown) by a power line 32. System main relays SMRB and SMRG are attached to the positive electrode side and the negative electrode side of the power line 32, respectively. The charging line 22 is connected between the system main relay 42 of the power line 32 and the inverter INV, and the power from the quick charging facility 10 passes through the charging relays DCRB, DCRG and the system main relay SMRB, SMRG in order. It is designed to be supplied to the battery 30. The battery 30 is managed by the battery ECU 34.

Although not shown, the battery ECU 34 is configured as a microprocessor centered on a CPU, and includes a ROM for storing a processing program, a RAM for temporarily storing data, an input / output port, a communication port, and the like, in addition to the CPU. .. The battery ECU 34 includes a battery current Ib from a current sensor 31 attached to a power line 32 connected to an output terminal of the battery 30, a battery voltage Vb from a voltage sensor (not shown) installed between the terminals of the battery 30 and the like. Is input via the input port. The battery ECU 34 calculates the storage ratio SOC, which is the ratio of the electric power that can be discharged from the battery 30 to the total capacity, based on the integrated value of the input battery current Ib. Further, the battery ECU 34 communicates with the HVECU 40, and the information obtained by the battery ECU 34 is transmitted to the HVECU 40 as needed.

Although not shown, the HVECU 40 is configured as a microprocessor centered on a CPU, and includes a ROM for storing a processing program, a RAM for temporarily storing data, an input / output port, a communication port, and the like, in addition to the CPU. The HVECU 40 turns on the system main relays SMRB and SMRG when the system is started, manages the system of the entire hybrid vehicle, and drives and controls the inverter INV that drives the motor for traveling. As described above, the HVECU 40 communicates with the charging ECU 24 and the battery ECU 34, and exchanges necessary information from the charging ECU 24 and the battery ECU 34.

The vehicle-mounted power supply device 20 of the embodiment corresponds to an inlet 21, a charging relay DCRB, DCRG, a charging ECU 24, a battery 30, a system main relay SMRB, SMRG, a battery ECU 34, and an HVECU 40. ..

The HVECU 40 has a high voltage when the battery 30 is fully charged or the predetermined charging time has elapsed while the battery 30 is being charged by the electric power from the quick charging facility 10 (during quick charging). Welding diagnosis is performed to see if the charging relays DCRB and DCRG are welded. Further, when the connector 11 is connected to the inlet 21, the HVECU 40 performs the welding diagnosis even if the welding diagnosis is not normally completed after the end of the previous charging. When the welding diagnosis is not normally completed after the charging is completed, for example, when an abnormality occurs in the battery 50 and the charging is forcibly terminated, or when the emergency stop switch (not shown) of the quick charging facility 10 is operated to charge the battery. For example, when is forcibly terminated. FIG. 2 is a flowchart showing an example of a welding diagnosis processing routine at the time of connector connection executed by the HVECU 40 of the embodiment.

In the welding diagnosis processing routine at the time of connector connection, the HVECU 40 first determines whether or not the previous welding diagnosis has been normally completed (step S100). If it is determined that the previous welding diagnosis has been completed normally, this routine is terminated without performing the welding diagnosis. In this case, if the battery 30 is not fully charged and no abnormality has occurred, charging of the battery 30 is started by connecting the connector 11 to the inlet 21. On the other hand, if it is determined that the previous welding diagnosis has not been performed normally, the system main relays SMRB, SMRG and the charging relays DCRB, DCRG are turned off (step S110). The off control of the charging relays DCRB and DCRG is performed by outputting a control command for turning off the charging relays DCRB and DCRG to the charging ECU 24 by communication. Then, the applied voltage Vdc from the voltage sensor 29 is input from the charging ECU 24 by communication, and it is determined whether or not the input applied voltage Vdc is less than a predetermined voltage Vref that can be regarded as a value 0 (step S120). If it is determined that the applied voltage Vdc is not less than the predetermined voltage Vref but is equal to or higher than the predetermined voltage Vref, it is determined that the bipolar welding of the charging relays DCRB and DCRG cannot be diagnosed (both pole welding cannot be diagnosed) (step S130), and the determination result that the bipolar welding cannot be diagnosed. Is stored in a non-volatile memory (not shown) (step S270), and this routine is terminated. Since we are considering a state in which the system main relays SMRB and SMRG are turned off, the applied voltage Vdc is determined by the presence or absence of welding of the charging relays DCRB and DCRG unless a voltage is applied from the quick charging equipment 10 to the inlet 21. Regardless, the value is 0. Therefore, when the applied voltage Vdc is equal to or higher than the predetermined voltage Vref when the system main relays SMRB, SMRG and the charging relays DCRB, DCRG are turned off, a voltage is applied from the quick charging facility 10 to the charging line 22. It is judged that the presence or absence of welding of the charge relays DCRB and DCRG cannot be distinguished depending on the applied voltage Vdc, and the welding diagnosis is not executed. If the previous welding diagnosis is not completed normally, even if the connector 11 is connected to the inlet 21, the charging ECU 24 does not allow the quick charging equipment 10 to be charged, so that the quick charging is usually performed. No voltage is applied from the equipment 10 to the charging line 22. However, when a voltage is applied to the charging line 22 due to some abnormality, the welding diagnosis is not executed in order to avoid a misdiagnosis.

When it is determined in step S120 that the applied voltage Vdc is less than the predetermined voltage Vref, next, the system main relays SMRB and SMRG are turned on and the charging relays DCRB and DCRG are turned off (step S140). Then, similarly to step S120, it is determined whether or not the applied voltage Vdc is less than the predetermined voltage Vref (step S150). When it is determined that the applied voltage Vdc is not less than the predetermined voltage Vref but equal to or higher than the predetermined voltage Vref, it is determined that welding has occurred at both poles of the charging relay DCRB and DCRG (both pole welding) (step S160), and the determination result of the bipolar welding is non-volatile. It is saved in the sexual memory (step S270), and this routine is terminated.

When it is determined in step S150 that the applied voltage Vdc is less than the predetermined voltage Vref, next, it is determined whether or not one electrode of the charging relays DCRB and DCRG is welded. That is, whether the applied voltage Vdc is less than the predetermined voltage Vref by controlling the charging relay DCRB on the positive electrode side on and controlling the charging relay DCRG on the negative electrode side off while the system main relays SMRB and SMRG are turned on and controlled (step S170). It is determined whether or not (step S180). Further, while the system main relays SMRB and SMRG are on-controlled, the charging relay DCRB on the positive electrode side is turned off and the charging relay DCRG on the negative electrode side is turned on (step S190), and whether the applied voltage Vdc is less than the predetermined voltage Vref. It is determined whether or not (step S200). When it is determined that the applied voltage Vdc is less than the predetermined voltage Vref in any of steps S180 and S200, it is determined that neither the charging relay DCRB nor the DCRG is welded and is normal (step S210), and this routine is terminated.

On the other hand, if it is determined in any of steps S180 and S200 that the applied voltage Vdc is equal to or higher than the predetermined applied voltage Vdc, the charging relays DCRB and DCRG are turned off while the system main relays SMRB and SMRG are on-controlled (step S230), and the applied voltage is applied. It is determined whether or not Vdc is less than the predetermined voltage Vref (step S240). When it is determined that the applied voltage Vdc is less than the predetermined voltage Vref, it is determined that welding has occurred in one pole of the charging relays DCRB and DCRG (unipolar welding) (step S250), and the determination result of the one-pole welding is stored in the non-volatile memory. Save (step S270) and end this routine. On the other hand, if it is determined that the applied voltage Vdc is equal to or higher than the predetermined voltage Vref, it is determined that unipolar welding cannot be diagnosed (unipolar welding cannot be diagnosed) (step S260), and the determination result that unipolar welding cannot be diagnosed is saved in the non-volatile memory. (Step 270), this routine is terminated. When a voltage is applied from the quick charging facility 10 to the inlet 21 due to some abnormality during the diagnosis of unipolar welding, the applied voltage Vdc becomes a predetermined voltage Vref or more, and it cannot be distinguished whether or not unipolar welding is performed by the applied voltage Vdc. Therefore, welding diagnosis is stopped to prevent erroneous diagnosis.

FIG. 3 is an explanatory diagram showing the time change of the connector connection state, the applied voltage Vdc, the system main relays SMRB, SMRG, and the charging relays DCRB, DCRG in the welding diagnosis process. As shown in the figure, when the connector 11 is connected to the inlet 21 (time T1), the system main relays SMRB, SMRG and the charging relays DCRB, DCRG are turned off. In this example, since the applied voltage Vdc remains approximately 0 (less than the predetermined voltage Vref), it is determined that welding diagnosis is possible, and the system main relays SMRB and SMRG are turned on to control whether the applied voltage Vdc is approximately 0. Depending on whether or not the charging relays DCRB and DCRG are welded to both poles, a diagnosis is made (time T2). In this example, since the applied voltage Vdc remains approximately 0, it is determined that the two electrodes are not welded, and only the charging relay DCRB on the positive electrode side of the charging relays DCRB and DCRG is turned on to control the charging relay on the negative electrode side. Diagnosis is made as to whether or not the DCRG is welded (time T3). Next, among the charging relays DCRB and DCRG, only the charging relay DCRG on the negative electrode side is turned on and controlled to diagnose whether or not the charging relay DCRB on the positive electrode side is welded (time T4). In this example, it is determined that the applied voltage Vdc is larger than the approximate value 0 (predetermined voltage Vref or more) in the diagnosis of unipolar welding at time T4. Then, in order to distinguish whether the determination result is due to unipolar welding or the voltage applied from the quick charging equipment 10 to the inlet 21 during the diagnosis, the system main relays SMRB and SMRG are turned on and charged. The applied voltage Vdc is checked with the relays DCRB and DCRG turned off (time T5). In this example, even if the charging relays DCRB and DCRG are turned off, the applied voltage Vdc is larger than the approximate value 0, so it is determined that the voltage is applied from the quick charging equipment 10, and the welding diagnosis is stopped.

In the power supply device 20 of the above-described embodiment, when the connector 11 of the quick charging equipment 10 is connected to the inlet 21, a bipolar welding determination of whether or not both poles of the charging relay DCRB and DCRG are welded is executed. If it is determined that both poles are not welded, the one-pole welding determination of whether or not one pole of the charging relays DCRB and DCRG is welded is executed. Then, while the one-pole welding determination is being executed, the system main relays SMRB and SMRG are turned on and the charging relays DCRB and DCRG are turned off, and the voltage sensor 25 detects a voltage equal to or higher than the predetermined voltage Vref. , Stops the execution of unipolar welding determination. As a result, even if a voltage is applied from the quick charging equipment 10 to the inlet 21 for some reason while the unipolar welding determination is being executed, this can be detected and the execution of the unipolar welding determination can be stopped. .. As a result, misdiagnosis of unipolar welding can be prevented.

In the power supply device 20 of the embodiment, in the welding diagnosis processing routine at the time of connector connection, when the connection connector 11 is connected to the inlet 21, if the welding diagnosis is not normally completed after the previous charging is completed, the welding diagnosis is not completed normally after step S110. Welding diagnosis was to be performed. However, regardless of whether or not the welding diagnosis is normally completed after the previous charging is completed, the welding diagnosis may be executed when the connector 11 is connected to the inlet 21.

In the power supply device 20 of the embodiment, during the diagnosis of unipolar welding, the system main relays SMRB and SMRG are turned on and the charging relays DCRB and DCRG are turned off, and the applied voltage Vdc at that time causes unipolar welding. It is intended to distinguish the application of voltage from the external power supply to the inlet 21. However, after the determination that there is no bipolar welding in step S150 and before the diagnosis of unipolar welding, the system main relays SMRB and SMRG are turned on and the charging relays DCRB and DCRG are turned off, and the applied voltage Vdc at that time is used to externally control the system main relays. If it is determined that the voltage from the power source to the inlet 21 is applied, the diagnosis of unipolar welding may not be performed.

In the power supply device 20 of the embodiment, the HVECU 40 executes the welding diagnosis processing routine at the time of connector connection in FIG. 2, but the charging ECU 24 may execute the welding diagnosis processing routine at the time of connector connection, or the battery ECU 34 may execute the welding diagnosis processing routine at the time of connector connection. The welding diagnosis processing routine at the time of connecting the connector may be executed.

Although the power supply device 20 of the embodiment includes three electronic control units of the charging ECU 24, the battery ECU 34, and the HVECU 40, it may be a single electronic control unit or may be provided with two electronic control units. Alternatively, it may be provided with four or more electronic control units. Then, the welding diagnosis processing routine at the time of connector connection shown in FIG. 2 may be executed by any of the electronic control units.

In the embodiment, it is assumed that the power supply device 20 is mounted as the power source of the hybrid vehicle, but as described above, the power supply device 20 may be mounted as the power source of the electric vehicle.

The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem will be described. In the embodiment, the battery 30 corresponds to the "battery", the system main relays SMRB and SMRG correspond to the "system main relay", the charging relays DCRB and DCRG correspond to the "charging relay", and the voltage sensor 25 corresponds to the "voltage". The HVECU 40 corresponding to the "sensor" and executing the welding diagnosis processing routine at the time of connecting the connector in FIG. 2 corresponds to the "control device".

As for the correspondence between the main elements of the examples and the main elements of the invention described in the column of means for solving the problem, the invention described in the column of means for solving the problems of the examples is carried out. Since it is an example for specifically explaining the mode for solving the problem, the elements of the invention described in the column of means for solving the problem are not limited. That is, the interpretation of the invention described in the column of means for solving the problem should be performed based on the description in the column, and the examples are the inventions described in the column of means for solving the problem. It is just a concrete example.

Although the embodiments for carrying out the present invention have been described above with reference to the embodiments, the present invention is not limited to these examples, and the present invention is not limited to these embodiments, and various embodiments are used without departing from the gist of the present invention. Of course it can be done.

The present invention can be used in the manufacturing industry of in-vehicle power supply devices and the like.

10 quick charging equipment, 11 connection connector, 20 power supply, 21 inlet, 21a connection switch, 22 charging line, 24 electronic control unit for charging (charging ECU), 25 voltage sensor, 30 battery, 31 current sensor, 32 power line, 34 Battery ECU, 40 Hybrid electronic control unit (HVECU), SMRB, SMRG system main relay, DCRB, DCRG charging relay.

Claims (1)

From the battery, the system main relay attached to the power line from the battery to the vehicle drive, and the inlet to which the external power supply connector is connected to the vehicle drive side of the power line from the system main relay. A charging relay attached to the positive electrode side and the negative electrode side of the charging line, a voltage sensor for detecting the voltage between the positive and negative electrodes between the inlet and the charging relay of the charging line, the system main relay and the above. An in-vehicle power supply device including a control device for controlling a charging relay.
When a predetermined determination execution condition including that the external power supply connector is connected to the inlet is satisfied, the control device controls off the system main relay and turns off the positive voltage side and the negative voltage side of the charging relay. Then, a bipolar welding determination is executed to determine whether or not both poles of the charging relay are welded depending on whether or not the voltage detected by the voltage sensor is less than the predetermined voltage, and the detected voltage is less than the predetermined voltage. If it is determined that the voltage is determined to be, the voltage detected by the voltage sensor is controlled by turning off the system main relay, turning on one of the positive and negative relays of the charging relay, and turning off the other relay. The system executes a unipolar welding determination for determining whether or not the other relay is welded depending on whether or not is less than a predetermined voltage, and between the start of the unipolar welding determination and the determination of the determination. When the main relay is turned on and the positive and negative sides of the charging relay are turned off and a voltage equal to or higher than a predetermined voltage is detected by the voltage sensor, the execution of the one-pole welding determination is stopped.
In-vehicle power supply.

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