JP2009179161A - Brake control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the reliability of a brake control device by securely blocking a current fed from a power source when an abnormality of the brake control device occurs. <P>SOLUTION: The brake control device 10 is provided with first and second current paths 1 and 2 connected between a positive side terminal 11a and a negative side terminal 11b of the power source 11. When an abnormality of the device 10 occurs, a current fed from the power source 11 is blocked by the fusion of a fuse 8. The brake control device 10 is provided with a brake drive means 6 provided on the first current path 1 to be driven by a current fed by the first current path 1 to actuate a vehicle brake, and a brake control means 3 to control the drive of the brake drive means 6, and control to switch a flow of a current from the power source 11 from the first current path 1 to the second current path 2 for feeding an overcurrent to the fuse 8. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a brake control device that performs, for example, brake control, and more particularly to a brake control device that reliably cuts off a current supplied from a power source by disconnection of a fuse when the brake control device is abnormal. .

Conventionally, it has a current interrupting means for interrupting current when an overcurrent flows, and an overcurrent generating part for flowing the overcurrent. When a power failure occurs, the overcurrent generating part generates an overcurrent. A power shut-off device that cuts off a current from a power source is known (for example, see Patent Document 1).
JP-A-6-321027

  Further, in the above conventional power shutoff device, when it is determined that a power failure has occurred by comparing the current value flowing by the power source with the total current value of the vehicle equipment that is actually operating, It only discloses that the current from the power source is cut off, and does not disclose any application and configuration to a brake control device that requires high reliability. Therefore, it is difficult to say that the reliability of the brake control device can be improved by simply applying the conventional power shut-off device to the brake control device.

  The present invention has been made in view of the above-described conventional problems, and a brake control device that improves reliability by reliably cutting off the current supplied from the power supply when the brake control device is abnormal. The main purpose is to provide.

  To achieve the above object, one aspect of the present invention includes first and second current paths connected between a positive terminal and a negative terminal of a power supply, respectively, and is supplied from the power supply when the apparatus is abnormal. A brake control device that cuts off the current generated by the disconnection of the fuse, and is provided in the first current path and is driven by the current supplied through the first current path to actuate the brake of the vehicle; And a brake control means for controlling the driving of the brake driving means and switching the flow of current from the power source from the first current path to the second current path, thereby causing an overcurrent to flow in the fuse. This is a brake control device.

According to this aspect, when the brake control device is abnormal, the current supplied from the power source can be cut off more reliably, and the reliability of the brake control device can be improved.
Moreover, in this one aspect | mode, it further provided with the voltage detection means provided in the 1st electric current path, and detects the voltage applied with respect to a brake drive means, A brake control means is the voltage detected by the voltage detection means, An abnormality determining unit that determines whether or not the device is abnormal based on the control state of the brake driving means, and if the abnormality determining unit determines that the device is abnormal, the brake The control means may switch the flow of current from the power source from the first current path to the second current path. Thus, when the abnormality determination unit determines that the device is abnormal, the current supplied from the power supply can be interrupted by the disconnection of the fuse.

  Furthermore, in this aspect, the brake control further includes a first changeover switch that is provided in the first current path and switches the first current path between a non-connected state and a connected state based on a control instruction from the brake control unit. The means controls the stop and drive of the brake drive means by switching the first changeover switch between the non-connected state and the connected state, and the abnormality determination unit instructs the first changeover switch to control the non-connected state. When it is determined that the voltage is detected and the voltage detected by the voltage detecting means is equal to or higher than the first predetermined voltage, it may be determined that the first changeover switch is abnormal. Thereby, when the abnormality determination unit determines that the first changeover switch is abnormal, the current supplied from the power supply can be interrupted by the disconnection of the fuse.

  In this one aspect, the abnormality determination unit determines that a connection state control instruction has been given to the first changeover switch, and the voltage detected by the voltage detection means is equal to or lower than a second predetermined voltage that is smaller than the first predetermined voltage. May be determined as at least one of the abnormality of the first changeover switch, the disconnection of the first current path, and the abnormality of the brake driving means. Thereby, when the abnormality determining unit determines that there is at least one of the abnormality of the first changeover switch, the disconnection of the first current path, and the abnormality of the brake driving means, the current supplied from the power source is It can be cut off by disconnection of the fuse.

  In this one aspect, the temperature of the first changeover switch provided in the first current path and switching the first current path between the non-connected state and the connected state based on a control instruction from the brake control means, And a brake control means for controlling the stop and drive of the brake drive means by switching the first changeover switch between a non-connected state and a connected state, and an abnormality determination unit. Determines that the first changeover switch is in an unconnected state and determines that the temperature detected by the temperature detecting means is equal to or higher than a predetermined temperature, the first changeover switch is abnormal. You may judge. Thereby, when the abnormality determination unit determines that the first changeover switch is abnormal, the current supplied from the power supply can be interrupted by the disconnection of the fuse.

  In this one aspect, the second current path has a current capacity equal to or greater than a predetermined capacity, and the second current path is provided with a second changeover switch for switching the second current path between a connected state and a disconnected state. When the abnormality determining unit determines that the device is abnormal, the brake control means switches the second changeover switch from the non-connected state to the connected state, thereby changing the current flow from the power source to the first. Switching from one current path to a second current path may be performed. As a result, when the abnormality determination unit determines that the device is abnormal, an overcurrent is passed through the fuse, the fuse is disconnected, and the current supplied from the power source can be interrupted.

  In this one aspect, when the abnormality determination unit determines that there is an abnormality, it may further include notification means for notifying the user of the abnormality. Thereby, the user can recognize the abnormality of a brake control apparatus more reliably.

  In this one aspect, the fuse is a slow blow fuse, the brake driving means is an electric motor that drives a pump for controlling the brake fluid pressure, and the brake control means controls the driving of the electric motor. Further, anti-lock brake control of the vehicle may be performed. Thereby, when the brake control device is abnormal, the current supplied from the power supply to the electric motor can be reliably cut off, and the reliability of the antilock brake control can be further improved.

  ADVANTAGE OF THE INVENTION According to this invention, the electric current supplied from a power supply can be interrupted | blocked reliably at the time of abnormality of a brake control apparatus, and the reliability of a brake control apparatus can be improved.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram illustrating an example of a system configuration of a brake control device according to an embodiment of the present invention.

  The brake control device 10 according to the present embodiment includes a first current path 1, a second current path 2, a brake control unit 3, a first changeover switch 4, a second changeover switch 5, a servo motor (electric motor). ) 6 and a voltage sensor 7.

  The first and second current paths (wire harnesses) 1 and 2 are respectively connected between a positive side terminal (plus side terminal) 11a and a negative side terminal (minus side terminal) 11b of the power supply 11 that supplies current. Yes. Here, as the power supply 11, for example, a 12V or 24V battery mounted on a vehicle is used.

  On the positive side of the first and second current paths 1 and 2, a slow blow fuse 8 that melts when an overcurrent flows is connected via a first connector portion 12a and a first electric wire 13a. The slow blow fuse 8 is connected to the positive terminal 11a of the power source 11 via the second electric wire 13b.

  The slow blow fuse 8 is a fusible link having a longer fusing time than a normal fuse. The slow blow fuse 8 is, for example, a 50A type and has a resistance of 100A / 10s.

  The negative terminal 11b of the power source 11 is connected to the ground portion (GND) 14 of the vehicle via the third electric wire 13c. The negative sides of the first and second current paths 1 and 2 are connected to the ground portion 14 via the second connector portion 12b and the third electric wire 13c.

  The first current path 1 has a first line portion 1a, a second line portion 1b, and a third line portion 1c. The positive side of the first line portion 1 a is connected to the first connector portion 12 a, and the negative side of the first line portion 1 a is connected to the positive side of the first changeover switch 4. The positive side of the second line portion 1b is connected to the negative side of the first changeover switch 4, and the third connector portion 12c is connected to the negative side of the second line portion 1b.

  The first changeover switch 4 may switch between the first line portion 1a and the second line portion 1b (first current path 1) between a connected state (conductive state) and a non-connected state (non-conductive state). it can. A well-known relay switch is applied to the first changeover switch 4 and the second changeover switch 5.

  The positive side of the servo motor 6 is connected to the third connector portion 12c. The positive side of the third line portion 1c is connected to the negative side of the servo motor 6, and the second connector portion 12b is connected to the negative side of the third line portion 1c. When supplied with current, the servo motor 6 rotates and drives a plunger pump 16 for controlling the brake fluid pressure.

A second changeover switch 5 is provided in the second current path 2. The second changeover switch 5 can switch the second current path 2 between a connected state and a disconnected state.
The brake control unit 3 performs so-called antilock brake control (ABS control) based on vehicle information (wheel speed, acceleration, etc.) detected by various sensors of the vehicle. Here, the anti-lock brake control refers to control that reduces the brake fluid pressure supplied to the wheel cylinder 17 of each wheel and avoids the locked state of the wheel during vehicle braking, for example. Note that the operation principle of the antilock brake control, the basic control method, and the like are known to those skilled in the art, and thus detailed description thereof is omitted.

  The brake control unit 3 temporarily stores, for example, a CPU (Central Processing Unit) that performs arithmetic processing, control processing, a ROM (Read Only Memory) in which a control program is stored, and data as main hardware configurations RAM (Random Access Memory) or the like. The CPU, ROM, and RAM are interconnected via a data bus, for example.

  A first changeover switch 4 is connected to the brake control unit 3. The first change-over switch 4 is connected and disconnected between the first line portion 1a and the second line portion 1b of the first current path 1 based on a control signal (control instruction) from the brake control unit 3. Switch to state.

  When the brake control unit 3 controls the first changeover switch 4 from the disconnected state to the connected state, a current is supplied from the power source 11 to the servo motor 6. As a result, the servo motor 6 drives the pump 16 to reduce the brake fluid pressure supplied to the wheel cylinder 17 of each wheel, and the anti-lock brake control is performed.

  Moreover, the brake control part 3 controls the 1st changeover switch 4 from a connection state to a non-connection state, and the electric current supplied to the servomotor 6 from the power supply 11 is interrupted | blocked. Thereby, the drive of the servomotor 6 and the pump 16 is stopped, and the antilock brake control is stopped.

  The brake control unit 3 is connected to the second changeover switch 5 of the second current path 2. The second changeover switch 5 switches the second current path 2 between a connected state and a disconnected state based on a control signal from the brake control unit 3.

  The brake control unit 3 controls the second changeover switch 5 from the non-connected state to the connected state, so that the current supplied from the positive side of the power source 11 is supplied to the negative side of the power source 11 via the second current path 2. It can flow in a short circuit to the (GND side).

  Here, the second current path 2 has a current capacity equal to or greater than a predetermined capacity. The predetermined capacity is a current capacity that can withstand a current that can reliably blow the lobe low fuse 8, and is, for example, about three times the current capacity of the lobe low fuse 8. As a result, when the second changeover switch 5 is controlled to be in the connected state, the current supplied from the power source 11 is short-circuited via the second current path 2 without almost passing through the first current path 1 and the power source. 11 will flow to the negative side.

  Furthermore, the overcurrent (large current) from the positive side terminal 11a of the power source 11 causes the second electric wire 13b, the slow blow fuse 8, the first electric wire 13a, the first connector portion 12a, the second current path 2, the second connector portion. It flows to the ground part 14 through 12b and the third electric wire 13c. Due to the overcurrent flowing through the slow blow fuse 8, the slow blow fuse 8 can be surely blown.

  As described above, by controlling the second changeover switch 5 to the connected state, the current supplied from the power supply 11 can be caused to flow by being short-circuited by the second current path 2 while avoiding the first current path 1. As a result, the slow blow fuse 8 that is normally difficult to be blown can be blown easily and reliably, so that the current supply from the power source 11 can be cut off reliably. Therefore, for example, when an abnormality occurs in the brake control device 10, the brake control device 10 can be safely and reliably protected.

  A voltage sensor 7 that detects a voltage V applied to the servomotor 6 is provided in the second line portion 1 b of the first current path 1. The voltage sensor 7 is connected to the brake control unit 3.

  The brake control unit 3 includes an abnormality determination unit 3a that determines whether or not the brake control device 10 is abnormal. The abnormality determination unit 3a determines whether or not the brake control device 10 is abnormal based on the voltage V detected by the voltage sensor 7 and the control state of the servo motor 6 (or the first changeover switch 4). to decide. The abnormality determination unit 3a is realized by, for example, a program stored in the ROM and executed by the CPU.

  For example, when the abnormality determination unit 3a determines that a control signal for disconnecting the first changeover switch 4 has been transmitted, the abnormality determination unit 3a determines that an instruction to stop driving the servo motor 6 has been issued. Further, when determining that the voltage V detected by the voltage sensor 7 is equal to or higher than the first predetermined voltage V1 (V ≧ V1), the abnormality determination unit 3a determines that the servo motor 6 is being driven. Further, when the abnormality determination unit 3a determines that an instruction to stop driving the servo motor 6 has been issued and determines that the servo motor 6 is being driven, the abnormality determination unit 3a determines that the brake control device 10 is abnormal.

  The abnormality of the brake control device 10 includes, for example, an abnormal operation of the first changeover switch 4 (fixed and inoperative, etc.). The first predetermined voltage V1 is normally set based on a voltage when the servo motor 6 is operated.

  The abnormality determination unit 3a uses the timer function to determine whether or not the servo motor 6 is being driven after a lapse of a predetermined time t (t <1 s) from when the servo motor 6 drive stop instruction is issued. It may be judged. As a result, it is possible to consider that the servo motor 6 rotates by inertia for a certain time after the servo motor 6 drive stop instruction, and the determination accuracy is improved.

  If the abnormality determination unit 3a determines that a control signal to be connected to the first changeover switch 4 has been transmitted, it determines that an instruction to start driving the servo motor 6 has been issued. Further, when determining that the voltage V detected by the voltage sensor 7 is equal to or lower than the second predetermined voltage V2 (V ≦ V2), the abnormality determination unit 3a determines that the servo motor 6 is stopped. Furthermore, when the abnormality determination unit 3a determines that a drive start instruction for the servo motor 6 has been issued and determines that the servo motor 6 is stopped, it determines that the brake control device 10 is abnormal.

  Examples of the abnormality of the brake control device 10 include an operation abnormality of the first changeover switch 4, a disconnection of the first current path 1, an abnormality of the servo motor 6 (including an overload of the servo motor 6 (pump 16)). included. The second predetermined voltage V2 is normally set based on the voltage when the servo motor 6 is stopped driving.

  As described above, when the abnormality determination unit 3a determines that the brake control device 10 is abnormal, the brake control unit 3 controls the second changeover switch 5 from the disconnected state to the connected state. In this case, the current supplied from the power source 11 flows to the negative side (GND side) of the power source 11 via the second current path 2, and as described above, an overcurrent can flow through the slow blow fuse 8, The blow fuse 8 can be blown. Thereby, the current supplied from the power source 11 to the servo motor 6 can be forcibly cut off by the blow of the slow blow fuse 8.

  On the other hand, the abnormality determination unit 3a determines that a control signal for disconnecting the first changeover switch 4 is transmitted, and instructs to stop driving the servo motor 6, and the voltage detected by the voltage sensor 7 is detected. When V is equal to or lower than the second predetermined voltage V2 (V ≦ V2) and it is determined that the servo motor 6 is stopped, it is determined that the brake control device 10 is normal.

  Similarly, the abnormality determination unit 3a determines that the control signal for entering the connection state is transmitted to the first changeover switch 4 to instruct the drive start of the servo motor 6, and the voltage V detected by the voltage sensor 7 is detected. Is equal to or higher than the first predetermined voltage V1 (V ≧ V1), and it is determined that the brake control device 10 is normal when it is determined that the servo motor 6 is being driven.

  The abnormality determination unit 3a is connected to a notification device 14 that notifies the user of the abnormality of the brake control device 10. As described above, the abnormality determination unit 3a transmits a notification signal to the notification device 14 when determining that the brake control device 10 is abnormal. When the notification device 14 receives the notification signal from the abnormality determination unit 3a, the notification device 14 notifies the user that the brake control device 10 is abnormal.

  As the notification device 14, for example, a speaker 14a that outputs a warning sound, a warning light (failure lamp) 14b that lights / flashes, a display device 14c that displays the abnormality, a vibration device 14d that vibrates a steering wheel, a seat, and the like, Communication device 14e (a wireless device or the like that automatically contacts a pre-registered location (home, vehicle repair shop, vehicle dealer, police station, fire department, other vehicle, etc.)) is included.

  Next, the determination process flow by the abnormality determination unit 3a of the brake control device 10 according to the present embodiment will be described in detail. FIG. 2 is a flowchart illustrating an example of the determination process flow by the abnormality determination unit 3a of the brake control device 10 according to the present embodiment. The determination process flow shown in FIG. 2 is repeatedly executed every predetermined minute time (for example, every 60 ms).

First, the abnormality determination unit 3a determines whether or not a control signal for entering a connection state is transmitted to the first changeover switch 4 and a drive instruction for the servo motor 6 is issued (S100).
When the abnormality determination unit 3a determines that the drive instruction of the servo motor 6 has been performed (Yes in S100), the voltage V detected by the voltage sensor 7 is equal to or higher than the first predetermined voltage V1, and the servo motor 6 is being driven. It is determined whether or not there is (S110).

  When determining that the servo motor 6 is being driven (Yes in S110), the abnormality determining unit 3a determines that the brake control device 10 is normal (S120), and ends the determination process. In this case, the servo motor 6 is normally driven in response to the drive instruction to the servo motor 6 and the antilock brake control is normally performed.

  On the other hand, when determining that the servo motor 6 is stopped (No in S110), the abnormality determining unit 3a determines that the brake control device 10 is abnormal (S130). In this case, contrary to the drive instruction to the servo motor 6, the servo motor 6 is stopped, indicating that an abnormality has occurred in the brake control device 10.

  When the abnormality determination unit 3a determines that the brake control device 10 is abnormal, the brake control unit 3 controls the second changeover switch 5 to the connected state (S140). As a result, the current supplied from the power source 11 flows short-circuited to the ground portion 14 via the second current path 2, so that an overcurrent flows through the slow blow fuse 8 and the slow blow fuse 8 is melted. The current supplied from the power source 11 to the servo motor 6 is forcibly cut off by the blow of the slow blow fuse 8, and the control of the brake control device 10 can be stopped reliably.

  Furthermore, the abnormality determination unit 3 a transmits a notification signal to the notification device 14. When the notification device 14 receives the notification signal from the abnormality determination unit 3a, the notification device 14 notifies the user of the abnormality of the brake control device 10 (S150), and ends this determination processing. Thereby, the user can recognize the abnormality of the brake control apparatus 10 reliably.

  In the above (S100), when the abnormality determination unit 3a determines that the drive instruction of the servo motor 6 has not been performed (No in S100), a control signal to be disconnected is transmitted to the first changeover switch 4, It is determined whether an instruction to stop driving the servo motor 6 has been issued (S160).

  When the abnormality determination unit 3a determines that the drive stop instruction for the servo motor 6 has been issued (Yes in S160), the voltage V detected by the voltage sensor 7 is equal to or lower than the second predetermined voltage V2, and the servo motor 6 is stopped. It is determined whether or not (S170).

On the other hand, when determining that the drive stop instruction for the servo motor 6 has not been issued (No in S160), the abnormality determination unit 3a ends the determination process.
If the abnormality determination unit 3a determines that the servo motor 6 is stopped (Yes in S170), the abnormality determination unit 3a determines that the brake control device 10 is normal (S180), and ends the determination process. In this case, in response to the drive stop instruction to the servo motor 6, the servo motor 6 is normally stopped.

On the other hand, when determining that the servo motor 6 is not stopped (No in S170), the abnormality determining unit 3a determines that the brake control device 10 is abnormal (S130).
When the abnormality determining unit 3a determines that the brake control device 10 is abnormal, the brake control unit 3 controls the second changeover switch 5 to the connected state (S140). As a result, the current supplied from the power source 11 flows short-circuited to the ground portion 14 via the second current path 2, so that an overcurrent flows through the slow blow fuse 8 and the slow blow fuse 8 is melted. Therefore, the current supplied from the power source 11 to the servo motor 6 is forcibly cut off by the blow of the slow blow fuse 8, and the control of the brake control device 10 can be stopped reliably.

  Furthermore, the abnormality determination unit 3 a transmits a notification signal to the notification device 14. When the notification device 14 receives the notification signal from the abnormality determination unit 3a, the notification device 14 notifies the user of the abnormality of the brake control device 10 (S150). Thereby, the user can recognize the abnormality of the brake control apparatus 10 reliably.

  As described above, in the brake control device 10 according to the present embodiment, when the abnormality determination unit 3a determines that the brake control device 10 is abnormal, the brake control unit 3 controls the second changeover switch 5 to the connected state. As a result, the current supplied from the power source 11 flows short-circuited to the ground portion 14 via the second current path 2, so that an overcurrent flows through the slow blow fuse 8 and the slow blow fuse 8 is melted. Therefore, the current supplied from the power source 11 to the servo motor 6 is forcibly cut off by the blow of the slow blow fuse 8, and the control of the brake control device 10 can be stopped reliably. That is, when the brake control device 10 is abnormal, the supply of current supplied from the power supply 11 can be reliably cut off, and the reliability of the brake control device 10 can be improved.

  When the abnormality determination unit 3a determines that the brake control device 10 is abnormal, the notification device 14 notifies the user of the abnormality of the brake control device 10. Thereby, the user can recognize the abnormality of the brake control apparatus 10 more reliably.

  Although the present invention has been described with reference to exemplary embodiments, various modifications may be made and elements may be replaced with equivalents without departing from the scope of the invention. Will be understood by those skilled in the art. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the spirit of the invention. Accordingly, the invention is not intended to be limited to the specific embodiments disclosed as the best mode contemplated for carrying out it, but is intended to include all embodiments within the scope of the appended claims.

  For example, in the above-described embodiment, the servo motor 6 may be provided with a rotation sensor that detects the rotational drive of the servo motor 6. The abnormality determination unit 3a may determine whether or not the servo motor 6 is being driven (stopped) based on the rotation of the servo motor 6 detected by the rotation sensor.

  In the embodiment, the first changeover switch 4 may be provided with a temperature sensor 15 that detects the temperature of the first changeover switch 4. In this configuration, for example, when the abnormality determination unit 3a determines that the temperature of the first changeover switch 4 detected by the temperature sensor 15 is equal to or higher than the predetermined temperature T1 and the first changeover switch 4 is abnormal, the brake The control unit 3 may control the second changeover switch 5 to the connected state and blow the slow blow fuse 8. Note that a thermostat may be applied as the temperature sensor 15. The predetermined temperature T1 is set by experimentally obtaining a temperature at which an abnormality occurs in the first changeover switch 4.

  Furthermore, in the said one Embodiment, the structure provided with the current sensor which detects the electric current supplied to the servomotor 6 may be sufficient. In this case, for example, the abnormality determination unit 3a may determine that the servo motor 6 is being driven when the current A detected by the current sensor is equal to or higher than the first predetermined voltage A1 (A ≧ A1). Similarly, the abnormality determination unit 3a may determine that the servo motor 6 is stopped when the current A detected by the current sensor is equal to or lower than the second predetermined voltage A2 (A ≦ A2).

It is a block diagram showing an example of a system configuration of a brake control device concerning one embodiment of the present invention. It is a flowchart which shows an example of the abnormality determination process flow by the abnormality determination part of the brake control apparatus which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st electric current path 2 2nd electric current path 3 Brake control part (brake control means)
3a Abnormality determination part 4 1st change-over switch 5 2nd change-over switch 6 Servo motor 7 Voltage sensor (voltage detection means)
DESCRIPTION OF SYMBOLS 8 Slow blow fuse 10 Brake control apparatus 11 Power supply 11a Positive side terminal 11b Negative side terminal 12a 1st connector part 12b 2nd connector part 12c 3rd connector part 13a 1st electric wire 13b 2nd electric wire 13c 3rd electric wire 14 Notification apparatus (informing means)
15 Temperature sensor (temperature detection means)
16 Pump 17 Wheel cylinder

Claims (8)

Brake control including first and second current paths respectively connected between a positive terminal and a negative terminal of a power supply, and cutting off a current supplied from the power supply when the apparatus is abnormal by disconnection of a fuse A device,
Brake driving means provided in the first current path and driven by a current supplied by the first current path to operate a brake of the vehicle;
Brake control means for controlling the driving of the brake driving means and for switching the current flow from the power source from the first current path to the second current path, thereby causing an overcurrent to flow through the fuse; ,
A brake control device comprising: The brake control device according to claim 1,
Voltage detection means provided in the first current path for detecting a voltage applied to the brake driving means;
The brake control unit includes an abnormality determination unit that determines whether the device is abnormal based on the voltage detected by the voltage detection unit and a control state of the brake drive unit. And
When the abnormality determination unit determines that the device is abnormal, the brake control unit switches the current flow from the power source from the first current path to the second current path. Brake control device. The brake control device according to claim 2,
A first changeover switch provided in the first current path, for switching the first current path between a disconnected state and a connected state based on a control instruction from the brake control means;
The brake control means controls stop and drive of the brake drive means by switching the first changeover switch between the non-connected state and the connected state,
The abnormality determining unit determines that the control instruction for the non-connected state has been given to the first changeover switch, and determines that the voltage detected by the voltage detecting unit is equal to or higher than a first predetermined voltage. And determining that the first changeover switch is abnormal. The brake control device according to claim 3,
The abnormality determination unit determines that the connection state control instruction has been given to the first changeover switch, and the voltage detected by the voltage detection unit is a second predetermined voltage smaller than the first predetermined voltage. Brake control, characterized in that, when it is determined that it is at least one of abnormality of the first changeover switch, disconnection of the first current path, and abnormality of the brake driving means, apparatus. The brake control device according to claim 2,
A first changeover switch provided in the first current path, for switching the first current path between a disconnected state and a connected state based on a control instruction from the brake control means;
Temperature detecting means for detecting the temperature of the first changeover switch,
The brake control means controls stop and drive of the brake drive means by switching the first changeover switch between the non-connected state and the connected state,
When the abnormality determining unit determines that the control instruction for the non-connected state is given to the first changeover switch, and determines that the temperature detected by the temperature detecting unit is equal to or higher than a predetermined temperature, A brake control device, wherein the first changeover switch is determined to be abnormal. The brake control device according to any one of claims 2 to 5,
The second current path has a current capacity equal to or greater than a predetermined capacity;
The second current path is provided with a second changeover switch for switching the second current path between a connected state and a disconnected state,
When the abnormality determining unit determines that the device is abnormal, the brake control unit switches the second changeover switch from the non-connected state to the connected state, thereby causing a current flow from the power source. Is switched from the first current path to the second current path. The brake control device according to any one of claims 2 to 6,
A brake control device, further comprising notification means for notifying the user of the abnormality when the abnormality determination unit determines that the abnormality is present. The brake control device according to claim 1,
The fuse is a slow blow fuse,
The brake driving means is an electric motor that drives a pump for controlling brake fluid pressure,
The brake control device according to claim 1, wherein the brake control means performs anti-lock brake control of the vehicle by controlling driving of the electric motor.

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