JP2022052182A - Power supply system of moving body - Google Patents

Abstract

[Problem] When an electrical abnormality occurs in a computing device, the power supply to the computing device is cut off as quickly as possible, thereby improving the power consumption of a mobile body. [Solution] The system includes a battery 2, a plurality of sub-ECUs 11-13 capable of sending control signals to devices possessed by the mobile body, a central ECU 20 communicatively connected to each of the sub-ECUs 11-13 and controlling the sub-ECUs 11-13 in an overall manner, and a relay device relaying a power supply path between the battery 2 and at least one of the sub-ECUs and the central ECU 20, the relay device having a plurality of semiconductor fuses 31-33 each controlling the on/off of the power supply from the battery 2 to at least one of the sub-ECUs, and the central ECU 20 having an MCU 21 capable of communicating with the semiconductor fuses 31-33 and controlling the on/off of the semiconductor fuses 31-33. [Selected Figure] Figure 4

Description

The technology disclosed herein belongs to the technical field relating to mobile power systems.

In recent years, a large number of electronic devices are arranged in moving objects such as automobiles. Along with this, the configuration of power supply to each electronic device is being studied.

For example, in Patent Document 1, only a network in which a gateway ECU for relaying communication between ECUs (computing devices) of different networks is provided and a transmission target ECU that first starts transmission after all networks are put into sleep state exists. An in-vehicle communication system that wakes up is disclosed.

Japanese Unexamined Patent Publication No. 2016-17740

By the way, each arithmetic unit operates by being supplied with electric power from a battery like a device to be controlled. Therefore, when an energization abnormality such as a short circuit occurs in the arithmetic unit, the electric power from the battery is wasted. Therefore, when an abnormality occurs in the arithmetic unit, it is preferable to cut off the power supply to the arithmetic unit as quickly as possible.

In Patent Document 1, power consumption can be expected to be suppressed by controlling the wake-up state of each arithmetic unit by the gateway ECU. However, the control for each arithmetic unit when an energization abnormality occurs for each arithmetic unit is not considered. Therefore, in recent years when the electrification of mobile bodies has progressed, there is room for improvement from the viewpoint of improving the electricity cost of mobile bodies.

The technology disclosed here has been made in view of these points, and the purpose thereof is to cut off the power supply to the arithmetic unit as quickly as possible when an abnormal power supply occurs in the arithmetic unit. The purpose is to improve the electricity cost of the mobile body.

In order to solve the above-mentioned problems, in the technique disclosed herein, a battery, a plurality of sub-arithmetic devices capable of transmitting a control signal to a device included in the mobile body, and the plurality of sub-arithmetic units, for the power supply system of the mobile body, are used. The central arithmetic unit, which is communication-connected to each of the sub-arithmetic units and controls the plurality of sub-arithmetic units, and the battery, at least one sub-arithmetic logic unit, and the central arithmetic unit are electrically connected to each other. The relay device includes a relay device that relays a power supply path between the battery and the at least one sub-arithmetic unit and the central arithmetic unit, and the relay device turns on / off the power supply from the battery to the sub-arithmetic unit. The central arithmetic unit has a plurality of switch systems for controlling each of the above, and the central arithmetic unit has an energization control unit capable of communicating with the relay device and outputting a control signal for controlling on / off of each switch system. , Was adopted.

According to this configuration, since the central processing unit is communicatively connected to each sub-arithmetic unit, it is possible to acquire information regarding the energization state in each sub-arithmetic unit. Further, the central processing unit can control the on / off of the switch system of each sub-arithmetic unit in the relay device. Therefore, when the information of the energization abnormality is sent from the sub arithmetic unit, the central processing unit can quickly cut off the power supply to the sub arithmetic unit in which the energization abnormality has occurred. As a result, it is possible to improve the electricity cost in the mobile body.

In the mobile power supply system, the central processing unit may include a communication unit for acquiring at least information on an energized state from the at least one sub-arithmetic unit.

According to this configuration, the central processing unit can reliably acquire information regarding the energization state from each sub-arithmetic unit. As a result, the power supply to the sub-arithmetic logic unit in which the energization abnormality has occurred can be cut off more quickly.

In the mobile power supply system, the battery includes a first battery and a second battery capable of supplying power having a higher voltage than the first battery, and the relay device is supplied from the second battery. It may be configured to include a DCDC converter that steps down the voltage of the electric power to the voltage of the first battery.

That is, in a hybrid vehicle or the like, the voltage of the battery that operates the motor that generates the driving force for traveling is generally different from the voltage of the battery that operates the motor of the power window. In such a case, a DCDC converter is provided so that power can be supplied to the ECU of the device having a low operating voltage even from a battery having a relatively high voltage. In the above configuration, the DCDC converter is a relay device having a switch system, so that it is not necessary to separately provide a fuse box. Therefore, the power supply system can be made compact.

In the power supply system of the mobile body, the energization control unit is the switch system corresponding to the sub arithmetic unit in which the energization abnormality occurs when there is an energization abnormality between the battery and the sub arithmetic unit. The energization control unit is configured to turn off the switch system corresponding to one sub-arithmetic unit when a plurality of the sub-arithmetic units are connected to the relay device. In addition, the switch system corresponding to the other sub-arithmetic logic unit related to the one sub-arithmetic logic unit may be configured to output a control signal to the relay device in order to turn it off. ..

That is, the device controlled by the sub arithmetic unit in which the energization abnormality has occurred (hereinafter referred to as the first device) and the device controlled by the normal sub arithmetic unit (hereinafter referred to as the second device) operate in conjunction with each other. If there is, if the power supply of only one sub arithmetic unit is cut off, the second device will not function. As a result, power is supplied to the non-functional device, which may consume unnecessary power. Therefore, even if the sub-arithmetic logic unit that controls the second device is in a normal state, it is preferable to cut off the power supply together with the sub-arithmetic logic unit in which the energization abnormality has occurred. Therefore, in the above configuration, the electricity cost in the mobile body can be further improved.

As described above, according to the technique disclosed here, when an energization abnormality occurs in the arithmetic unit, the power supply to the arithmetic unit can be cut off as quickly as possible. As a result, it is possible to improve the electricity cost in the mobile body.

It is a block diagram which shows the electric power supply system of the vehicle which mounted the power supply system which concerns on Embodiment 1. FIG. It is a block diagram which shows the power supply system. It is a block diagram schematically showing the control of a central ECU when an energization abnormality occurs in a 1st sub ECU. It is a block diagram which shows the modification of the power supply system of Embodiment 2. It is a block diagram which shows the electric power supply system of the vehicle which mounted the power supply system which concerns on Embodiment 3. FIG. It is a block diagram which shows the electric power supply system in Embodiment 3. FIG. It is a block diagram which shows the electric power supply system of the vehicle which mounted the power supply system which concerns on Embodiment 4. It is a block diagram which shows the electric power supply system in Embodiment 4.

Hereinafter, exemplary embodiments will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 shows the configuration of a power supply system of a mobile body on which the power supply system according to the first embodiment is mounted. In the first embodiment, the moving body is a vehicle 1 of an automobile. The vehicle 1 is a 5-door type vehicle having four side doors and one back door. The vehicle 1 is a vehicle capable of manual driving that runs according to the operation of the accelerator or the like by the driver, assisted driving that runs by assisting the driver's operation, and automatic driving that runs without the driver's operation. be. In the following description, the moving body may be simply referred to as the vehicle 1. For "front", "rear", "right", and "left", "front of vehicle 1", "rear of vehicle 1", "right of vehicle 1", and "left of vehicle 1" are used. means.

As shown in FIG. 1, the vehicle 1 includes a battery 2, first to fourth sub-ECUs 11 to 14 (Electric Control Units) capable of transmitting control signals to the device included in the vehicle 1, and first to fourth sub-ECUs 11. It is provided with a central ECU 20 that is connected to each of 14 and 14 and controls the first to fourth sub-ECUs 11 to 14 in an integrated manner. The battery 2, the first to fourth sub-ECUs 11 to 14, and the central ECU 20 are each connected to the fuse box 30 via a feeder line. Each electric wire may be any electric wire that can supply electric power, and is composed of, for example, a wire harness. The number of sub-ECUs may be less than four or five or more. Further, there may be a plurality of batteries 2 and fuse boxes 30. The number of electric wires is increased or decreased according to the number of sub ECUs, the number of batteries 2, and the number of fuse boxes 30.

The battery 2 is a 12V battery in the first embodiment. The battery 2 is composed of, for example, a lead storage battery.

The first to fourth sub-ECUs 11 to 14 are computer hardware, respectively, and specifically, each of the first to fourth sub-ECUs 11 to 14 has a processor having a CPU, a memory in which a plurality of modules are stored, and the like. The first to fourth sub-ECUs 11 to 14 are connected to the devices mounted on the vehicle 1 so as to be able to communicate with each other. The first to fourth sub-ECUs 11 to 14 output control signals to each device based on the control signals from the central ECU 20. The device is a concept including a sensor and an actuator, and is, for example, a transmission D1, a wiper D2, a car navigation system D3, a winker D4, and the like as shown in FIG. In the first embodiment, the transmission D1 is controlled by the fourth sub-ECU 14, the car navigation system D3 is controlled by the second sub-ECU 12, and the winker D4 is controlled by the third sub-ECU 13. The operation of the wiper D2 is controlled by the first sub-ECU 11, while the power supply of the wiper D2 is controlled by the second sub-ECU 12. The device is not limited to the one illustrated here, and a large number of devices may be mounted on the vehicle 1. In the following description, when the illustrated transmission D1, wiper D2, car navigation D3, and winker D4 are not distinguished, they may be simply referred to as devices D1 to D4.

As shown in FIG. 2, the central ECU 20 has a micro control unit (hereinafter referred to as MCU 21) and a communication unit 22 for communicating with the first to fourth sub ECUs 11 to 14.

The MCU 21 generates control signals for controlling the devices D1 to D4 and transmits them to the first to fourth sub ECUs 11 to 14, respectively. The control signals output by the central ECU 20 to the first to fourth sub ECUs 11 to 14 indicate, for example, the operation targets of the devices D1 to D4, and the control amount for actually operating the devices D1 to D4 is. , 1st to 4th sub ECUs 11 to 14 generate. When there is a sub-ECU that does not operate (when the power supply is cut off as described later), the MCU 21 directly controls the device controlled by the sub-ECU on behalf of the sub-ECU. Further, the MCU 21 can communicate with the fuse box 30, and by controlling the operation of the fuse box 30, it is possible to control the energization of the first to fourth sub ECUs 11 to 14. Details of the energization control by the MCU 21 will be described later.

The communication unit 22 transmits the control signal generated by the MCU 21 to the first to fourth sub-ECUs 11 to 14, and acquires information about the operating state from the first to fourth sub-ECUs 11 to 14. The operating state of the first to fourth sub-ECUs 11 to 14 includes the energized state of the first to fourth sub-ECUs 11 to 14. The energized state of the first to fourth sub-ECUs 11 to 14 includes, for example, an overcurrent due to an abnormality in an electric wire, a short circuit in the ECU, and the like. CAN (Controller Area Network), CAN-FD (CAN with Flexible Datarate), Ethernet (registered trademark) and the like can be used as the communication method between the communication unit 22 and the first to fourth sub ECUs 11 to 14. The communication method between the communication unit 22 and the first to fourth sub ECUs 11 to 14 may be a wireless method, a part of which may be a wireless method, and the other may be a wired method. The communication unit 22 is an example of a module stored in the memory of the central ECU 20.

The fuse box 30 functions as a relay device that relays the power supply path between the battery 2 and the first to fourth sub-ECUs 11 to 14 and the central ECU 20. Specifically, the fuse box 30 has a function of dividing the electric power supplied from the battery 2 into the first to fourth sub-ECUs 11 to 14 and the central ECU 20 and distributing the electric power to the first to fourth sub-ECUs 11 to 14 and the central ECU 20. It has.

As shown in FIG. 2, the fuse box 30 has a plurality of switch systems that control on / off of power supply from the battery 2 to the first to fourth sub ECUs 11 to 14, respectively. The switch system between the battery 2 and the first to fourth sub ECUs 11 to 14 is composed of semiconductor fuses, respectively. A first semiconductor fuse 31 is provided between the battery 2 and the first sub-ECU 11, a second semiconductor fuse 32 is provided between the battery 2 and the second sub-ECU 12, and the battery 2 and the third sub-ECU 13 are provided. A third semiconductor fuse 33 is provided between the two, and a fourth semiconductor fuse 34 is provided between the battery 2 and the fourth sub ECU 14. Further, the fuse box 30 has a fuse 35 that controls on / off of power supply from the battery 2 to the central ECU 20.

The first to fourth semiconductor fuses 31 to 34 are configured to be communicable with the MCU 21. CAN, CAN-FD, Ethernet (registered trademark) and the like can be used as the communication method between the MCU 21 and the first to fourth semiconductor fuses 31 to 34. The ON / OFF state of the first to fourth semiconductor fuses 31 to 34 is controlled by the MCU 21. That is, the energized state between the battery 2 and the first to fourth sub ECUs 11 to 14 is controlled by the MCU 21. For example, when the first semiconductor fuse 31 is turned on by the MCU 21, power is supplied from the battery 2 to the first sub ECU 11, while when the MCU 21 turns the first semiconductor fuse 31 off, the battery 2 supplies electric power. The power supply from the battery 2 to the first sub ECU 11 is cut off. For this reason, the MCU 21 constitutes an energization control unit.

Here, in the conventional fuse box, the first to fourth sub ECUs 11 to 14 are protected by the fuse being broken when an overcurrent flows through the electric wire. However, if any of the first to fourth sub-ECUs 11 to 14 has an internal energization abnormality such as a short circuit, it cannot be protected by a conventional fuse. In the sub-ECU in which the energization abnormality has occurred, the current is consumed more than necessary, and the electricity cost of the vehicle 1 is deteriorated. Further, if power is continuously supplied to the sub-ECU in the energized abnormal state, the energized state may be further deteriorated and a failure may occur. Therefore, from the viewpoint of improving the electric power cost of the vehicle 1 and preventing the failure, it is desirable to cut off the power supply to the sub-ECU in which the energization abnormality has occurred as quickly as possible.

On the other hand, in the first embodiment, when the central ECU 20 acquires the information of the energization abnormality from the first to fourth sub-ECUs 11 to 14, the semiconductor fuse of the sub-ECU having the energization abnormality is turned off. As a result, it is possible to cut off the power supply to the sub-ECU having an abnormal energization.

Further, the central ECU 20 is configured to turn off the semiconductor fuse corresponding to the other sub-ECU associated with the one sub-ECU when the semiconductor fuse corresponding to the one sub-ECU is turned off. There is. Specifically, for example, it is assumed that a short circuit occurs inside the first sub ECU 11. At this time, if only the power supply to the first sub-ECU 11 is cut off, the operation of the wiper D2 cannot be controlled, but the power can be supplied to the wiper D2 by the second sub-ECU 12. In this case, if the wiper D2 cannot be operated properly and the wiper D2 is forcibly operated, the wiper D2 may be damaged. Therefore, even if the energized state of the second sub-ECU 21 is normal, the central ECU 20 cuts off the power supply for the operation of the second sub-ECU 12 in conjunction with the first sub-ECU 11. On the contrary, when the central ECU 20 cuts off the power supply to the second sub-ECU 12, the central ECU 20 also cuts off the power supply to the first sub-ECU 11. Then, the central ECU 20 directly controls the wiper D2 and the car navigation system D3. The combination of sub-ECUs that cut off the power supply may be stored in the memory of the central ECU 20 in the form of a table, for example. Further, as described above, the "other sub-ECU related to one sub-ECU" is a sub-ECU that controls a device controlled by one sub-ECU and a device related to the device, or a device control in one sub-ECU. It means another sub-ECU that determines the control state of the device controlled by itself based on the state.

Next, with reference to FIG. 3, a process until the energization of the sub-ECU is cut off will be described. First, for example, it is assumed that a short circuit occurs in the first sub ECU 11. Information that a short circuit has occurred in the first sub-ECU 11 is transmitted to the communication unit 22 of the central ECU 20. Information on the short circuit of the first sub-ECU 11 is transmitted from the communication unit 22 to the MCU 21. The MCU 21 reads the table or the like stored in the memory and determines the sub-ECU (here, the second sub-ECU 12) to be stopped in conjunction with the first sub-ECU 11. Then, the MCU 21 transmits a control signal to the first semiconductor fuse 31 and the second semiconductor fuse 32 to turn off the first semiconductor fuse 31 and the second semiconductor fuse 32. As a result, the energization of the first sub-ECU 11 and the second sub-ECU 12 is cut off. On the other hand, with respect to the third and fourth sub ECUs 13 and 14, the on state of the third and fourth semiconductor fuses 33 and 34 is maintained, and the energized state is maintained.

As described above, in the first embodiment, since the central ECU 20 is communicatively connected to the first to fourth sub-ECUs 11 to 14, it is possible to acquire information on the energized state in each of the sub-ECUs 11 to 13. Further, the central ECU 20 can control the on / off of the first to fourth semiconductor fuses 31 to 34 in the fuse box 30. Therefore, when the information of the energization abnormality is sent from the sub-ECU, the central ECU 20 can quickly cut off the power supply to the sub-ECU in which the energization abnormality has occurred. Thereby, the electricity cost in the vehicle 1 can be improved.

In particular, in the first embodiment, the central ECU 20 has a built-in communication unit 22 for acquiring at least information on the energized state from each of the sub-ECUs 11 to 14. As a result, the central ECU 20 can surely acquire information on the energized state from each of the sub-ECUs 11 to 14. As a result, the power supply to the sub-ECU in which the energization abnormality has occurred can be cut off more quickly.

Further, in the present embodiment, when the central ECU 20 turns off the semiconductor fuse corresponding to one sub-ECU, the central ECU 20 also turns off the semiconductor fuse corresponding to the other sub-ECU associated with the one sub-ECU. It is configured in. As a result, the electricity cost in the vehicle 1 can be further improved, and the malfunction of the device can be suppressed.

(Embodiment 2)
Hereinafter, the second embodiment will be described in detail with reference to the drawings. In the following description, the parts common to the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 4, the second embodiment is different from the first embodiment in that the fuse box 30 and the central ECU 20 are integrated to form one power distribution device 230. The fuse box 30 and the central ECU 20 are integrated by being housed in one housing or mounted on one substrate, for example.

The central ECU 20 is configured to be able to communicate with the first to fourth sub ECUs 11 to 14 even in a state of being integrated with the fuse box 30. Therefore, when at least one of the first to fourth sub-ECUs 11 to 14 has an energization abnormality, the central ECU 20 turns off the corresponding semiconductor fuse in the fuse box 30.

Even in the configuration of the second embodiment, the central ECU 20 can quickly cut off the power supply to the sub-ECU in which the energization abnormality has occurred when the information of the energization abnormality is sent from the sub-ECU. , It is possible to improve the electric power cost in the vehicle 1.

In particular, in the second embodiment, since the fuse box 30 and the central ECU 20 are integrated, the time required for on / off control of the semiconductor fuse can be shortened. Thereby, the electricity cost in the vehicle 1 can be further improved. Further, by integrating the fuse box 30 and the central ECU 20, the configuration of the power supply system can be made as compact as possible.

(Embodiment 3)
Hereinafter, the third embodiment will be described in detail with reference to the drawings. In the following description, the parts common to the first and second embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 5, in the third embodiment, the power supply system of the vehicle 301 is a low-voltage battery 302 for supplying electric power having a relatively low voltage and an electric power supply system for supplying electric power having a relatively high voltage. It has a high voltage battery 303. The low-voltage battery 302 is, for example, a 12V battery and is composed of a lead storage battery or the like. The high-voltage battery 303 is, for example, a 48V battery and is composed of a lithium ion battery or the like.

The power supply system of the vehicle 301 has a fuse box 330 and a DCDC converter 340 (hereinafter, simply referred to as a converter 340). The low voltage battery 302 is connected to the fuse box 330 via an electric wire and is connected to the converter 340 via an electric wire. The high voltage battery 303 is connected to the converter 340 via an electric wire.

The fuse box 330 has a switch system for controlling on / off of power supply from the low voltage battery 302 to the third sub ECU 13. The switch system consists of a mechanical fuse 333.

The converter 340 steps down the voltage of the electric power supplied from the high voltage battery 303 to the same voltage as the low voltage battery 302 (for example, 12V). The converter 340 supplies the step-down electric power to the first, second, and fourth sub-ECUs 11, 12, and 14 and the central ECU 20. The DCDC converter 340 is an example of a relay device.

As shown in FIG. 6, the converter 340 includes two converter circuits 341 and 342, two controllers 343 and 344 that control each converter circuit 341 and 342, and a CPU 345 that outputs a control signal to each controller 343 and 344. Has. The converter circuits 341 and 342 are controlled by the controllers 343 and 344 based on the control signal from the CPU 345. Each converter circuit 341, 342 reduces the voltage of the high voltage battery 303 (for example, 48V) to a voltage comparable to that of the low voltage battery 302 (for example, 12V).

The converter 340 has a communication IC 346 for communicating with the central ECU 20. The communication IC 346 receives the signal transmitted from the communication IC 22 of the central ECU 20 and transmits it to the CPU 345. For example, CAN, CAN-FD, or the like can be adopted as the communication method between the communication IC 346 of the converter 340 and the communication IC 22 of the central ECU 20.

As shown in FIG. 6, the converter 340 has a plurality of switch systems that control on / off of power supply from the high voltage battery 303 to the first, second, and fourth sub ECUs 11, 12, and 14, respectively. Each switch system is composed of first, second, and fourth semiconductor fuses 347, 348, and 349, respectively. Further, the converter 340 has a central semiconductor fuse 350 that controls on / off of power supply from the high voltage battery 303 to the central ECU 20.

The ON / OFF state of the first, second, and fourth semiconductor fuses 347, 348, and 349 is controlled by the CPU 345. When the CPU 345 receives a control signal regarding at least one on / off of the first, second, and fourth semiconductor fuses 347, 348, 349 from the central ECU 20 via the communication IC 346, the corresponding semiconductor fuse is turned on / off. Toggle the off state. As a result, the energized state between the high voltage battery 303 and the first, second, and fourth sub-ECUs 11, 12, and 14 is controlled by the central ECU 20.

Whether the sub ECUs 11 to 14 are connected to the fuse box 330 or the converter 340 is determined by, for example, the length of the electric wire. That is, when the wire is shortened and the voltage drop due to the resistance of the wire can be suppressed by connecting to the converter 340 rather than connecting to the fuse box 330, the wire is preferentially connected to the converter 340. On the other hand, when the electric wire is originally long and it is difficult to obtain the effect of shortening the electric wire even if it is connected to the converter 340 (for example, the third sub ECU 13 in FIG. 5), it is connected to the fuse box 330. Further, a sub-ECU whose energization state should be inspected in detail by the sub-ECU itself, that is, a sub-ECU 12 that controls a plurality of devices by one ECU is connected to the converter 340.

In the third embodiment as well, as in the first and second embodiments, the central ECU 20 is a semiconductor corresponding to the central ECU 20 when an energization abnormality occurs in at least one of the first, second, and fourth sub-ECUs 11, 12, and 14. The fuse is turned off to cut off the power supply to the sub-ECU in which the energization abnormality has occurred. Further, also in the configuration of the third embodiment, when the central ECU 20 cuts off the power supply to one of the first and second sub-ECUs 11 and 12, the central ECU 20 also supplies power to the other of the first and second sub-ECUs 11 and 12. Cut off.

Even in the configuration of the third embodiment, the central ECU 20 can quickly cut off the power supply to the third sub-ECU 13 when the information of the energization abnormality is sent from the third sub-ECU 13. Therefore, the vehicle. The electricity cost in 301 can be improved.

(Embodiment 4)
Hereinafter, the fourth embodiment will be described in detail with reference to the drawings. In the following description, the parts common to the above-described first to third embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 7, in the fourth embodiment, the power supply system of the vehicle 401 includes a low voltage battery 402 having a relatively low voltage and a high voltage battery 403 having a relatively high voltage, as in the third embodiment. Has. The low-voltage battery 402 is, for example, a 12V battery and is composed of a lead storage battery or the like. The high-voltage battery 403 is, for example, a 48V battery and is composed of a lithium ion battery or the like.

The power supply system of the vehicle 401 according to the fourth embodiment is provided with a DCDC converter 440 (hereinafter, simply referred to as a converter 440) in the power supply system, but is not provided with a fuse box. Different from 3. The low voltage battery 402 is connected to the converter 340 via an electric wire. The high voltage battery 403 is connected to the converter 340 via an electric wire.

The converter 440 converts the electric power supplied from the high-voltage battery 403 into the same voltage as the low-voltage battery 402 (for example, 12V) and supplies it to the first to fourth sub-ECUs 11 to 14 and the central ECU 20. The DCDC converter 440 is an example of a relay device.

Similar to the third embodiment, the converter 340 includes two converter circuits 441 and 442, two controllers 443 and 444 that control each converter circuit 441 and 442, and a CPU 445 that outputs a control signal to each controller 443 and 444. And a communication IC 446 for communicating with the central ECU 20.

As shown in FIG. 8, the converter 440 has a plurality of switch systems that control on / off of power supply from the high voltage battery 403 to the first to fourth sub ECUs 11 to 14, respectively. Each switch system is composed of first to fourth semiconductor fuses 447 to 450, respectively. Further, the converter 440 has a central semiconductor fuse 451 that controls on / off of power supply from the high voltage battery 403 to the central ECU 20.

The ON / OFF state of the first to fourth semiconductor fuses 447 to 450 is controlled by the CPU 445, respectively. When the CPU 445 receives a control signal regarding on / off of the first to fourth semiconductor fuses 447 to 450 from the central ECU 20 via the communication IC 346, the CPU 445 sets the on / off state of the first to fourth semiconductor fuses 447 to 450. Switch. As a result, the energized state between the high voltage battery 303 and the first to fourth sub ECUs 11 to 14 is controlled by the central ECU 20.

Also in the fourth embodiment, when an energization abnormality occurs in at least one of the first to fourth sub-ECUs 11 to 14, the central ECU 20 turns off the corresponding semiconductor fuse and powers the sub-ECU in which the abnormality occurs. Cut off the supply. Further, also in the configuration of the present embodiment 4, when the central ECU 20 cuts off the power supply to one of the first and second sub-ECUs 11 and 12, the central ECU 20 also supplies power to the other of the first and second sub-ECUs 11 and 12. Cut off.

Even with the configuration of the fourth embodiment, the central ECU 20 can quickly cut off the power supply to the sub-ECU in which the energization abnormality has occurred when the information of the energization abnormality is sent from the sub-ECU. , It is possible to improve the electric power cost in the vehicle 401.

In particular, in the fourth embodiment, since the fuse box can be omitted, even if the power supply system has a high-voltage battery 403, the power supply system has a power supply system as compared with the case of the third embodiment. The configuration can be made compact.

(Other embodiments)
The technique disclosed herein is not limited to the above-described embodiment, and can be substituted as long as it does not deviate from the gist of the claims.

For example, as described in the first embodiment, the central ECU 20 cuts off the power supply to the sub-ECU when an energization abnormality occurs in the sub-ECU. Not only this, for example, when the vehicle 1 collides with an obstacle, the sub-ECU that controls devices related to the basic performance (running, braking, steering, etc.) of the vehicle such as the transmission D1 like the fourth sub-ECU 14 It may be configured to cut off the power supply of the. Further, when the vehicle 1 collides with an obstacle, the power supply to the sub-ECU that controls only the devices used only during traveling such as the first and second sub-ECUs 11 and 12 is cut off, and the third sub It is also possible to maintain the power supply to the sub-ECU that controls the necessary device at the time of emergency stop such as activation of the hazard lamp such as the ECU 13. As a result, the electric power of the battery can be preferentially used for controlling the device required at the time of emergency stop.

Further, in the above-described embodiments 3 and 4, the central ECU 20 sends a control signal to the CPUs 345 and 445 in the DCDC converters 340 and 440, and the CPUs 345 and 445 that receive the control signal are the semiconductor fuses 347 to 349, 447 to 450. It was configured to control the on / off of. Not limited to this, the central ECU 20 may directly control the semiconductor fuses 347 to 349, 447 to 450 without going through the CPUs 345 and 445.

Further, in the above-described embodiment, the vehicle of an automobile is targeted as a moving body, but the present invention is not limited to this, and a vehicle of heavy machinery or the like may be targeted.

The above embodiments are merely examples, and the scope of the present disclosure should not be construed in a limited manner. The scope of the present disclosure is defined by the scope of claims, and all modifications and changes belonging to the equivalent scope of the scope of claims are within the scope of the present disclosure.

The techniques disclosed herein are useful in mobile power systems to improve electricity costs in mobiles.

1 Vehicle (mobile body)
2 Battery 11 1st sub ECU (sub arithmetic unit)
12 Second sub ECU (sub arithmetic unit)
13 Third sub ECU (sub arithmetic unit)
14 4th sub ECU (sub arithmetic unit)
20 Central ECU (Central Processing Unit)
21 MCU (energization control unit)
30 Fuse box (relay device)
31 First semiconductor fuse (switch system)
32 Second semiconductor fuse (switch system)
33 Third semiconductor fuse (switch system)
34 Fourth semiconductor fuse (switch system)
301 Vehicle (mobile)
302 Low voltage battery (first battery)
303 High voltage battery (second battery)
340 DCDC converter (relay device)
347 1st semiconductor fuse (switch system)
348 Second semiconductor fuse (switch system)
349 4th semiconductor fuse (switch system)
401 Vehicle (mobile)
402 Low voltage battery (first battery)
403 High voltage battery (second battery)
440 DCDC converter (relay device)
447 1st semiconductor fuse (switch system)
448 Second semiconductor fuse (switch system)
449 Third semiconductor fuse (switch system)
450 4th semiconductor fuse (switch system)

Claims (4)

It ’s a mobile power system,
With the battery
A plurality of sub-arithmetic devices capable of transmitting control signals to the device of the mobile body, and
A central processing unit that is connected to each of the plurality of sub-arithmetic units by communication and controls the plurality of sub-arithmetic units in an integrated manner.
A relay device that is electrically connected to the battery, at least one sub-arithmetic unit, and the central processing unit, and relays a power supply path between the battery and the at least one sub-arithmetic unit and the central processing unit. And, with
The relay device has a plurality of switch systems for controlling on / off of power supply from the battery to the at least one sub-arithmetic unit.
The central processing unit is a mobile power supply system, which is capable of communicating with the relay device and has an energization control unit capable of outputting a control signal for controlling on / off of each switch system. In the mobile power supply system according to claim 1,
The central processing unit is a mobile power supply system including a communication unit for acquiring information on at least an energized state from the at least one sub-arithmetic unit. In the mobile power supply system according to claim 1 or 2.
The battery includes a first battery and a second battery capable of supplying electric power having a higher voltage than the first battery.
The relay device is a mobile power supply system including a DCDC converter that steps down the voltage of electric power supplied from the second battery to the voltage of the first battery. In the mobile power supply system according to any one of claims 1 to 3.
The energization control unit is configured to turn off the switch system corresponding to the sub arithmetic unit in which the energization abnormality has occurred when there is an energization abnormality between the battery and the sub arithmetic unit.
Further, when the switch system corresponding to the one sub arithmetic unit is turned off, the energization control unit is the one sub arithmetic unit when a plurality of the sub arithmetic units are connected to the relay device. A mobile power supply system characterized in that it is configured to output a control signal to the relay device in order to turn off the switch system corresponding to the other sub-arithmetic unit related to the above.

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