WO2022091783A1 - 給電制御装置、車載制御装置及び給電制御方法 - Google Patents

給電制御装置、車載制御装置及び給電制御方法 Download PDF

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Publication number
WO2022091783A1
WO2022091783A1 PCT/JP2021/037875 JP2021037875W WO2022091783A1 WO 2022091783 A1 WO2022091783 A1 WO 2022091783A1 JP 2021037875 W JP2021037875 W JP 2021037875W WO 2022091783 A1 WO2022091783 A1 WO 2022091783A1
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WIPO (PCT)
Prior art keywords
wire
temperature
current
power supply
value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/037875
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English (en)
French (fr)
Japanese (ja)
Inventor
卓真 山根
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Wiring Systems Ltd, AutoNetworks Technologies Ltd, Sumitomo Electric Industries Ltd filed Critical Sumitomo Wiring Systems Ltd
Priority to CN202180073588.1A priority Critical patent/CN116583440A/zh
Priority to US18/250,701 priority patent/US20230415681A1/en
Publication of WO2022091783A1 publication Critical patent/WO2022091783A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/0207—Wire harnesses
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H6/00—Emergency protective circuit arrangements responsive to undesired changes from normal non-electric working conditions using simulators of the apparatus being protected, e.g. using thermal images
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for DC mains or DC distribution networks

Definitions

  • the present disclosure relates to a power supply control device, an in-vehicle control device, and a power supply control method.
  • This application claims priority based on Japanese Application No. 2020-180893 filed on October 28, 2020, and incorporates all the contents described in the Japanese application.
  • Patent Document 1 discloses a power supply control device for a vehicle that controls power supply from a DC power source to a load via an electric wire.
  • a switch is arranged in the current path of the current flowing through the electric wire. By switching the switch on or off, the power supply from the DC power supply to the load is controlled.
  • the switch is on, a current flows from the DC power supply to the load through the wire, and the wire temperature of the wire rises.
  • the switch is off, the flow of current through the wires is stopped. Therefore, the wire temperature drops.
  • the wire temperature is calculated repeatedly. If the wire temperature exceeds the cutoff threshold while the switch is on, the switch is switched off. This prevents the wire temperature from becoming an abnormal temperature.
  • the power supply control device is a power supply control device that controls power supply via a plurality of electric wires, and includes a processing unit that executes processing, and the processing unit includes the processing unit via the plurality of electric wires.
  • the in-vehicle control device is an in-vehicle control device that controls the operation of a plurality of loads, and is a receiving unit that receives instruction data instructing the operation of the plurality of loads, and a process for executing the process.
  • the processing unit comprises a unit, and when the receiving unit receives the instruction data, a current is passed through the plurality of loads through the plurality of electric wires, and one of the wire temperatures of the plurality of electric wires is set.
  • the temperature becomes equal to or higher than the temperature threshold, the average value of the current values of the currents flowing through the normal electric wire whose wire temperature is lower than the temperature threshold is lowered among the plurality of electric wires.
  • the power supply control method is a power supply control method for controlling power supply via a plurality of electric wires, in which a step of passing a current through the plurality of electric wires and an electric wire of the plurality of electric wires are used.
  • a step of passing a current through the plurality of electric wires and an electric wire of the plurality of electric wires are used.
  • the present disclosure can be realized not only as a power supply control device provided with such a characteristic processing unit, but also as a power supply control method in which the characteristic processing is a step, or such a step can be applied to a computer. It can be realized as a computer program for execution. Further, the present disclosure can be realized as a semiconductor integrated circuit that realizes a part or all of the power supply control device, or can be realized as a power supply control system including the power supply control device.
  • FIG. It is a block diagram which shows the main part structure of the control system in Embodiment 1.
  • FIG. It is a block diagram which shows the composition of the main part of an individual ECU. It is a block diagram which shows the main part structure of a switch device. It is a block diagram which shows the main part structure of a microcomputer. It is a figure which shows the contents of the electric wire temperature table. It is a chart which shows the contents of the target value table. It is a flowchart which shows the procedure of the temperature calculation process of an electric wire. It is a flowchart which shows the procedure of the power supply control processing of a load. It is a flowchart which shows the procedure of the current reduction processing. It is a flowchart which shows the procedure of the current reduction processing.
  • the vehicle is loaded with multiple loads that operate simultaneously. With respect to multiple loads that are operated at the same time, there is a possibility that the operation of the vehicle will be hindered if all the operations are stopped.
  • Two headlights are examples of multiple loads that operate simultaneously. If the operation (lighting) of both headlights is stopped without the driver performing the operation to stop the operation, the operation of the vehicle may be hindered.
  • a power supply control device that controls power supply to a plurality of loads that are operated at the same time, for example, power is supplied to a plurality of loads via a plurality of electric wires.
  • a plurality of switches are arranged in each current path of the current flowing through the plurality of electric wires. Calculate the wire temperature of each wire. When the wire temperature of one wire becomes a temperature equal to or higher than the cutoff threshold value, the switch arranged in the current path of this wire is switched off. In this configuration, it is necessary to avoid the temperature of all electric wires being as high as possible, which is equal to or higher than the cutoff threshold.
  • the power supply control device is a power supply control device that controls power supply via a plurality of electric wires, and includes a processing unit that executes processing, and the processing unit is the plurality of electric wires.
  • the processing unit is the plurality of electric wires.
  • the power supply control device includes a plurality of switches arranged in each of the current paths of the current flowing through the plurality of electric wires, and a plurality of switches for switching on or off each of the plurality of switches.
  • the processing unit is provided with a switching circuit for passing a current through an electric wire by causing each switching circuit to perform PWM control for alternately switching the switch on and off, and the switch corresponding to the normal electric wire.
  • a current flows from a DC power supply to a plurality of loads via the plurality of electric wires, and the processing unit acquires the voltage value of the DC power supply and switches each of them.
  • the duty of the PWM control whose target value is the average value of the related values related to the load is calculated based on the acquired voltage value, and the duty of the PWM control performed by each switching circuit is set to the calculated duty.
  • the duty of the PWM control is lowered, and the related value is the current value of the current flowing through the load and the voltage of the voltage applied to the load. The value or the power supplied to the load.
  • the power supply control device includes a plurality of switches arranged in each of the current paths of the current flowing through the plurality of electric wires, and a plurality of switches for switching each of the plurality of switches on or off.
  • the processing unit includes a switching circuit, and the processing unit causes a current to flow through the electric wire by switching the switch on to each switching circuit, and turns the switch on and the switch to the switching circuit of the switch corresponding to the normal electric wire. By performing PWM control that alternately switches to off, the average value of the current values of the currents flowing through the normal electric wire is lowered.
  • the processing unit reduces the average value of the current values of the normal electric wire, and then the temperature of the abnormal electric wire becomes equal to or higher than the temperature threshold. When the wire temperature drops below the temperature threshold, the average value of the current values of the normal wire is increased.
  • the processing unit reduces the average value of the current values of the normal electric wires, and then the current of the normal electric wires is based on the electric wire temperature of the normal electric wires. It is determined whether or not the average value of the values is further lowered.
  • the processing unit acquires a current value of a current flowing through the plurality of electric wires, and based on the acquired plurality of current values, a plurality of electric wire temperatures. Is calculated.
  • the in-vehicle control device is an in-vehicle control device that controls the operation of a plurality of loads, and has a receiving unit that receives instruction data instructing the operation of the plurality of loads and processes.
  • the processing unit includes a processing unit for executing, and when the receiving unit receives the instruction data, the processing unit causes a current to flow through the plurality of electric wires through the plurality of electric wires, and the electric current is in the temperature of the plurality of electric wires.
  • the average value of the current values of the currents flowing through the normal electric wire whose wire temperature is lower than the temperature threshold is lowered among the plurality of electric wires.
  • the power supply control method is a power supply control method for controlling power supply via a plurality of electric wires, the step of passing a current through the plurality of electric wires, and the plurality of steps.
  • the electric wire temperatures of the electric wire becomes a temperature equal to or higher than the temperature threshold
  • the average value of the current values of the currents flowing through the normal electric wire whose electric wire temperature is lower than the temperature threshold among the plurality of electric wires is lowered.
  • the electric wire temperature is lower than the temperature threshold via a normal electric wire. Decrease the average value of the current value of the flowing current. Therefore, it is unlikely that the wire temperature of the normal wire will be high. As a result, it is unlikely that all wire temperatures will be high.
  • the current flow through the electric wire whose wire temperature is equal to or higher than the cutoff threshold value is stopped. As a result, the wire temperature does not become abnormally high.
  • the switching circuit performs PWM control to realize the current flow through the electric wire.
  • the duty of the PWM control performed by the switching circuit of the switch corresponding to the normal wire the average value of the current values of the normal wire is lowered.
  • the PWM control duty whose target value is the average value of the related values is calculated based on the voltage value of the DC power supply, and the PWM control duty is calculated as the duty. change. Decrease the target value of the load corresponding to the normal wire. As a result, the duty of the PWM control decreases, and the average value of the current values of the normal electric wires decreases.
  • the current flows through the electric wire by switching the switch on by the switching circuit.
  • the switching circuit of the switch arranged in the current path of the current flowing through the normal electric wire performs PWM control, so that the average value of the current values of the current flowing through the normal electric wire decreases.
  • the wire temperature of the abnormal wire drops to a voltage below the temperature threshold after the average value of the current value of the normal wire drops. This means that the abnormal wire has returned to the normal wire. Therefore, when the electric wire temperature of the abnormal electric wire drops to a temperature lower than the temperature threshold value, the average value of the current values of the normal electric wire is increased to, for example, the original average value.
  • the wire temperature is calculated based on the current value of the current flowing through the wire.
  • FIG. 1 is a block diagram showing a configuration of a main part of the control system 1 in the first embodiment.
  • the control system 1 is mounted on the vehicle C.
  • the control system 1 includes an integrated ECU 10, an individual ECU 11a, a plurality of individual ECUs 11b, a DC power supply 12, an actuator 13, two sensors 14a and 14b, and two loads B1 and B2.
  • the DC power supply 12 is, for example, a battery.
  • the connection line for supplying electric power is shown by a thick line.
  • the connecting lines through which data or signals propagate are indicated by thin lines.
  • the integrated ECU 10 is connected to the individual ECU 11a and the plurality of individual ECUs 11b.
  • the individual ECU 11a is connected to the positive electrode of the DC power supply 12, one end of the two electric wires W1 and W2, and the sensor 14a.
  • the other ends of the wires W1 and W2 are connected to one ends of the loads B1 and B2.
  • the negative electrode of the DC power supply 12 and the other ends of the loads B1 and B2 are grounded.
  • the actuator 13 and the sensor 14b are separately connected to the individual ECU 11b.
  • Loads B1 and B2 are electrical devices.
  • the individual ECU 11a operates the two loads B1 and B2 at the same time.
  • the individual ECU 11a stops the operations of the two loads B1 and B2 at the same time.
  • “simultaneous” does not mean only exact simultaneous.
  • “Simultaneous” also includes substantial simultaneousness.
  • the operation performed by the two loads B1 and B2 if the difference between the timing at which the first operation is performed and the timing at which the last operation is performed is within the error range, the two loads B1 and B2 are operated. The timing to do is substantially the same.
  • Actuator 13 is also an electrical device.
  • the individual ECU 11b outputs a control signal indicating the operation of the actuator 13 to the actuator 13.
  • the actuator 13 performs the operation indicated by the input control signal.
  • Sensors 14a and 14b each repeatedly generate vehicle data related to vehicle C.
  • the vehicle data is image data showing the periphery of the vehicle C, data indicating the speed of the vehicle C, data indicating whether or not the switch mounted on the vehicle C is on, and the like.
  • the sensor 14a outputs the generated vehicle data to the individual ECU 11a each time the vehicle data is generated.
  • the sensor 14b outputs the generated vehicle data to the individual ECU 11b.
  • Each of the individual ECUs 11a and 11b transmits the input vehicle data to the integrated ECU 10 each time the vehicle data is input.
  • the integrated ECU 10 determines the operation of the two loads B1 and B2 based on one or more vehicle data received from at least one of the individual ECUs 11a and the plurality of individual ECUs 11b.
  • the operation is an operation or a stop of the operation.
  • the integrated ECU 10 determines the operation of the two loads B1 and B2
  • the integrated ECU 10 transmits instruction data instructing the determined operation to the individual ECU 11a.
  • the individual ECU 11a receives the instruction data from the integrated ECU 10, the individual ECUs 11a cause the two loads B1 and B2 to perform the operation instructed by the received instruction data.
  • the integrated ECU 10 determines the operation of one or more actuators 13 based on one or more vehicle data received from at least one of the individual ECUs 11a and the plurality of individual ECUs 11b.
  • the integrated ECU 10 transmits instruction data instructing the determined operation to the one or a plurality of individual ECUs 11b.
  • the individual ECU 11b receives the instruction data from the integrated ECU 10
  • the individual ECU 11b outputs a control signal to the actuator 13 connected to the individual ECU 11b.
  • the operation indicated by the control signal is an operation instructed by the instruction data received by the individual ECU 11b.
  • the actuator 13 performs the operation indicated by the input control signal.
  • the DC power supply 12 supplies electric power to the load B1 via the individual ECU 11a and the electric wire W1.
  • the DC power supply 12 further supplies electric power to the load B2 via the individual ECU 11a and the electric wire W2.
  • the individual ECU 11a controls the power supply to the two loads B1 and B2 via the two electric wires W1 and W2.
  • the individual ECU 11a functions as a power supply control device.
  • the individual ECU 11a operates the two loads B1 and B2 at the same time by supplying electric power to the two loads B1 and B2.
  • the individual ECU 11a stops the operation of the two loads B1 and B2 at the same time by stopping the power supply to the two loads B1 and B2.
  • the individual ECU 11a controls the operation of the two loads B1 and B2 by controlling the power supply to the two loads B1 and B2.
  • the individual ECU 11a also functions as an in-vehicle control device.
  • the types of loads B1 and B2 are the same.
  • Each of the loads B1 and B2 is a headlight having an LED (Light Emitting Diode), a headlight having an incandescent light bulb, a wiper motor for driving a wiper, or the like.
  • the luminance value, rotation speed, and the like of the load B1 differ depending on the average value of the related values related to the load B1.
  • the luminance value, rotation speed, and the like of the load B2 differ depending on the average value of the related values related to the load B2.
  • the average value is calculated by averaging the related values within a certain period of time.
  • the first example of the related value is the current value of the current supplied to the load B1 or the load B2.
  • the second example of the related value is the voltage value of the voltage applied to the load B1 or the load B2.
  • the third example of the related value is the electric power supplied to the load B1 or the load B2.
  • the wiper motor the higher the voltage value of the voltage applied to the wiper motor, the faster the rotation speed.
  • the individual ECU 11a adjusts the average value of the related values for each of the loads B1 and B2 according to the voltage value between both ends of the DC power supply 12.
  • the voltage value between both ends of the DC power supply 12 is referred to as a power supply voltage value.
  • the individual ECU 11a repeatedly calculates the wire temperature of the wires W1 and W2.
  • the individual ECU 11a separately adjusts the current value of the current flowing through the electric wires W1 and W2 according to the calculated electric wire temperature of the electric wires W1 and W2.
  • FIG. 2 is a block diagram showing a configuration of a main part of the individual ECU 11a.
  • the individual ECU 11a includes a microcomputer (hereinafter referred to as a microcomputer) 20, a voltage detection unit 21, a temperature detection unit 22, and two switch devices G1 and G2.
  • the switch devices G1 and G2 are connected to the positive electrode of the DC power supply 12.
  • Each of the switch devices G1 and G2 is further connected to one end of the electric wires W1 and W2.
  • the switch devices G1 and G2 are further connected to the microcomputer 20.
  • the voltage detection unit 21 is connected to the positive electrode of the DC power supply 12.
  • the voltage detection unit 21 and the temperature detection unit 22 are connected to the microcomputer 20.
  • the microcomputer 20 is further connected to the integrated ECU 10 and the sensor 14a.
  • the switch device G1 has a switch 30 (see FIG. 3).
  • the switch 30 of the switch device G1 is arranged in the current path of the current flowing from the positive electrode of the DC power supply 12 to the load B1.
  • the switch 30 of the switch device G1 is switched on, the current flows from the positive electrode of the DC power supply 12 in the order of the switch 30, the electric wire W1, and the load B1.
  • electric power is supplied to the load B1.
  • the switch 30 of the switch device G1 is switched off, the current flow is stopped and the power supply to the load B1 is stopped.
  • the microcomputer 20 outputs a PWM (Pulse Width Modulation) signal or a low level voltage to the switch device G1.
  • the PWM signal indicates a high level voltage and a low level voltage.
  • the duty of the PWM signal is the ratio occupied by the period in which the voltage indicated by the PWM signal is the high level voltage in one cycle.
  • the duty is greater than zero and less than or equal to one.
  • the duty is adjusted by adjusting the timing at which the switching from the high level voltage to the low level voltage is performed.
  • the PWM signal may be periodically switched from the high level voltage to the low level voltage.
  • the duty is adjusted by adjusting the timing at which the switching from the low level voltage to the high level voltage is performed.
  • the switch device G1 When the microcomputer 20 outputs the PWM signal to the switch device G1 and the voltage indicated by the PWM signal is switched from the low level voltage to the high level voltage, the switch device G1 switches the switch 30 from off to on. In the same case, when the voltage indicated by the PWM signal is switched from the high level voltage to the low level voltage, the switch device G1 switches the switch 30 from on to off.
  • the switch device G1 outputs analog current value information indicating the electric wire current value of the current flowing through the switch 30 and the electric wire W1 to the microcomputer 20.
  • the current value information is, for example, a voltage value proportional to the electric wire current value of the electric wire W1.
  • the switch device G1 keeps the switch 30 off. Therefore, when the microcomputer 20 outputs a low level voltage, the load B1 has stopped operating.
  • the switch device G2 has a switch 30 like the switch device G1.
  • the microcomputer 20 outputs a PWM signal or a low level voltage to the switch device G2.
  • the switch device G2 operates in the same manner as the switch device G1. In the description of the operation of the switch device G1, the operation of the switch device G2 can be explained by replacing each of the switch device G1, the load B1 and the electric wire W1 with the switch device G2, the load B2 and the electric wire W2. Therefore, the switch device G2 outputs the electric wire current value of the electric wire W2 to the microcomputer 20.
  • the voltage detection unit 21 detects the power supply voltage value of the DC power supply 12.
  • the voltage detection unit 21 outputs analog power supply voltage value information indicating the detected power supply voltage value to the microcomputer 20.
  • the power supply voltage value information is, for example, a voltage value obtained by dividing the power supply voltage value.
  • the temperature detection unit 22 detects the environmental temperature.
  • the environmental temperature is the ambient temperature of the electric wires W1 and W2.
  • the temperature detection unit 22 outputs analog environmental temperature information indicating the detected environmental temperature.
  • the environmental temperature information is, for example, a voltage value that fluctuates according to the environmental temperature.
  • the sensor 14a outputs the generated vehicle data to the microcomputer 20 each time the vehicle data is generated.
  • the microcomputer 20 transmits the vehicle data input from the sensor 14a to the integrated ECU 10.
  • the microcomputer 20 receives instruction data instructing the operation or stop of the operation of the two loads B1 and B2 from the integrated ECU 10.
  • the microcomputer 20 receives instruction data instructing the operation of the two loads B1 and B2
  • the microcomputer 20 outputs a PWM signal to the two switch devices G1 and G2.
  • electric power is supplied to the two loads B1 and B2, so that the two loads B1 and B2 operate.
  • the microcomputer 20 When the microcomputer 20 receives instruction data instructing to stop the operation of the two loads B1 and B2, the microcomputer 20 outputs a low level voltage to the two switch devices G1 and G2. As a result, the power supply to the two loads B1 and B2 is stopped, so that the two loads B1 and B2 stop operating.
  • the microcomputer 20 adjusts the duty of the PWM signal based on the power supply voltage value indicated by the power supply voltage value information input from the voltage detection unit 21. Further, the microcomputer 20 outputs the electric wire current value of the electric wire W1 indicated by the current value information input from the switch device G1, the environmental temperature indicated by the environmental temperature information input from the temperature detection unit 22, and the switch device G1. The wire temperature of the wire W1 is repeatedly calculated based on the duty of the PWM signal.
  • the microcomputer 20 outputs the electric wire current value of the electric wire W2 indicated by the current value information input from the switch device G2, the environmental temperature indicated by the environmental temperature information input from the temperature detection unit 22, and the environmental temperature indicated by the environmental temperature information to the switch device G2.
  • the wire temperature of the wire W2 is repeatedly calculated based on the duty of the PWM signal.
  • the microcomputer 20 adjusts the duty of the PWM signal output to the switch devices G1 and G2 based on the calculated wire temperature of the wires W1 and W2.
  • the microcomputer 20 outputs a low level voltage to the switch device G1 and switches the switch 30 of the switch device G1 off.
  • the microcomputer 20 outputs a low level voltage to the switch device G2 and switches the switch 30 of the switch device G2 off.
  • the cutoff threshold value is a constant value and is stored in the storage unit 44 in advance.
  • FIG. 3 is a block diagram showing a main configuration of the switch device G1.
  • the switch device G1 includes a switch 30, a drive circuit 31, a current output unit 32, and a resistor 33.
  • the switch 30 is an N-channel type FET (Field Effect Transistor).
  • the drain of the switch 30 is connected to the positive electrode of the DC power supply 12.
  • the source of the switch 30 is connected to one end of the electric wire W1. As described above, the other end of the electric wire W1 is connected to one end of the load B1.
  • the gate of the switch 30 is connected to the drive circuit 31.
  • the drive circuit 31 is further connected to the microcomputer 20.
  • a current output unit 32 is further connected to the drain of the switch 30.
  • the current output unit 32 is further connected to one end of the resistance 33.
  • the other end of the resistor 33 is grounded.
  • the connection node between the current output unit 32 and the resistor 33 is connected to the microcomputer 20.
  • the switch 30 when the voltage value of the gate whose reference potential is the potential of the source is a constant voltage value or more, the switch 30 is on. When the switch 30 is on, current can flow through the drain and source. In the switch 30, when the voltage value of the gate whose reference potential is the potential of the source is less than a constant voltage value, the switch 30 is off. When the switch 30 is off, no current flows through the drain and source.
  • the microcomputer 20 outputs a PWM signal or a low level voltage to the drive circuit 31.
  • the drive circuit 31 raises the voltage value of the gate whose reference potential is the ground potential at the switch 30.
  • the switch 30 the voltage value of the gate whose reference potential is the potential of the source becomes a voltage value equal to or higher than a constant voltage value, and the switch 30 is switched on.
  • the drive circuit 31 lowers the voltage value of the gate whose reference potential is the ground potential at the switch 30.
  • the switch 30 the voltage value of the gate whose reference potential is the potential of the source becomes a voltage value less than a constant voltage value, and the switch 30 is switched off.
  • the drive circuit 31 performs PWM control for alternately switching the switch 30 on and off.
  • the duty of the PWM control is the ratio occupied by the period during which the switch 30 is on in a certain period.
  • the duty of the PWM control matches the duty of the PWM signal.
  • the drive circuit 31 When the microcomputer 20 outputs a low level voltage to the drive circuit 31, the drive circuit 31 lowers the voltage value of the gate whose reference potential is the ground potential at the switch 30. As a result, the switch 30 is switched off.
  • the current output unit 32 draws a current from the drain of the switch 30 and outputs the drawn current to the resistor 33.
  • the current value of the current output by the current output unit 32 is proportional to the electric wire current value of the electric wire W1 and is represented by (electric wire current value of the electric wire W1) / (predetermined number).
  • the voltage value between both ends of the resistor 33 is output to the microcomputer 20 as current value information.
  • the current value information is represented by (the electric wire current value of the electric wire W1) and (the resistance value of the resistor 33) / (a predetermined number). " ⁇ " Indicates the product. Since the resistance value and the predetermined number of the resistors 33 are constant values, the current value information indicates the electric wire current value of the electric wire W1.
  • the switch device G2 is configured in the same manner as the switch device G1. Therefore, the switch device G2 also has a switch 30, a drive circuit 31, a current output unit 32, and a resistor 33.
  • the microcomputer 20 outputs a PWM signal or a low level voltage to the drive circuit 31 of the switch device G2.
  • the configuration of the switch device G2 can be described by replacing the switch device G1 and the electric wire W1 with the switch device G2 and the electric wire W2. Therefore, the current value information output by the switch device G2 indicates the electric wire current value of the electric wire W2.
  • the switch 30 of the switch device G1 When the switch 30 of the switch device G1 is on, the current flows from the positive electrode of the DC power supply 12 via the switch 30 and the electric wire W1.
  • the switch 30 of the switch device G2 When the switch 30 of the switch device G2 is on, the current flows from the positive electrode of the DC power supply 12 via the switch 30 and the electric wire W2. Therefore, two switches 30 are arranged in each of the current paths flowing through the two electric wires W1 and W2.
  • the drive circuit 31 switches the switch 30 on or off.
  • the drive circuits 31 of the switch devices G1 and G2 each function as a switching circuit.
  • FIG. 4 is a block diagram showing a configuration of a main part of the microcomputer 20.
  • the microcomputer 20 has A / D conversion units 40 and 41, an input unit 42, a communication unit 43, a storage unit 44, a control unit 45, two output units H1 and H2, and two A / D conversion units J1 and J2. These are connected to the internal bus 46.
  • Each of the A / D conversion units 40 and 41 is further connected to the voltage detection unit 21 and the temperature detection unit 22.
  • the input unit 42 is further connected to the sensor 14a.
  • the communication unit 43 is further connected to the integrated ECU 10.
  • Each of the output units H1 and H2 is further connected to the drive circuit 31 of the switch devices G1 and G2.
  • Each of the A / D conversion units J1 and J2 is further connected to the connection node of the switch devices G1 and G2.
  • Analog power supply voltage value information is input from the voltage detection unit 21 to the A / D conversion unit 40.
  • the A / D conversion unit 40 converts the input analog power supply voltage value information into digital power supply voltage value information.
  • the control unit 45 acquires digital power supply voltage value information from the A / D conversion unit 40.
  • Analog environmental temperature information is input from the temperature detection unit 22 to the A / D conversion unit 41.
  • the A / D conversion unit 41 converts the input analog environmental temperature information into digital environmental temperature information.
  • the control unit 45 acquires digital environmental temperature information from the A / D conversion unit 41.
  • the sensor 14a repeatedly outputs vehicle data to the input unit 42.
  • the communication unit 43 transmits vehicle data to the integrated ECU 10 according to the instructions of the control unit 45.
  • the communication unit 43 receives instruction data instructing the operation or stop of the operation of the two loads B1 and B2 from the integrated ECU 10.
  • the communication unit 43 functions as a receiving unit.
  • Each of the output units H1 and H2 outputs a PWM signal to the drive circuit 31 of the switch devices G1 and G2 according to the instruction of the control unit 45.
  • the duty of the PWM signal output by each of the output units H1 and H2 is adjusted by the control unit 45.
  • Each of the output units H1 and H2 further outputs a low level voltage to the drive circuit 31 of the switch devices G1 and G2 according to the instruction of the control unit 45.
  • Analog current value information is input to the A / D conversion units J1 and J2 from the connection nodes of the switch devices G1 and G2.
  • Each of the A / D conversion units J1 and J2 converts the input analog voltage value information into digital current value information.
  • the control unit 45 acquires digital current value information from each of the A / D conversion units J1 and J2.
  • the current value information acquired from each of the A / D conversion units J1 and J2 indicates the electric wire current value of the electric wires W1 and W2.
  • the storage unit 44 is a non-volatile memory.
  • the computer program P is stored in the storage unit 44.
  • the control unit 45 has a processing element for executing processing, for example, a CPU (Central Processing Unit).
  • the control unit 45 functions as a processing unit.
  • the processing element of the control unit 45 executes vehicle data transmission processing, two temperature calculation processing, two power supply control processing, current reduction processing, and the like in parallel.
  • the vehicle data transmission process is a process of transmitting vehicle data to the integrated ECU 10.
  • Each of the two temperature calculation processes is a process for calculating the wire temperature of the wires W1 and W2.
  • Each of the two power supply control processes is a process for controlling power supply to the loads B1 and B2.
  • the current reduction process is a process for reducing the electric wire current value of one electric wire in the electric wires W1 and W2.
  • the computer program P may be stored in the non-temporary storage medium A so that the processing element of the control unit 45 can read it.
  • the computer program P read from the storage medium A by a reading device (not shown) is written in the storage unit 44.
  • the storage medium A is an optical disk, a flexible disk, a magnetic disk, a magnetic disk disk, a semiconductor memory, or the like.
  • the optical disk is a CD (Compact Disc) -ROM (Read Only Memory), a DVD (Digital Versatile Disc) -ROM, or a BD (Blu-ray (registered trademark) Disc).
  • the magnetic disk is, for example, a hard disk.
  • the computer program P may be downloaded from an external device (not shown) connected to a communication network (not shown), and the downloaded computer program P may be written in the storage unit 44.
  • the number of processing elements included in the control unit 45 is not limited to 1, and may be 2 or more. When the number of processing elements possessed by the control unit 45 is two or more, a plurality of processing elements cooperate to execute vehicle data transmission processing, two temperature calculation processing, two power supply control processing, current reduction processing, and the like. May be good.
  • the control unit 45 periodically executes each of the two temperature calculation processes. In each of the two temperature calculation processes, the control unit 45 calculates the wire temperature of the wires W1 and W2. In each of the two temperature calculation processes, the control unit 45 calculates the temperature difference between the electric wire temperature and the environmental temperature.
  • the control unit 45 expresses the preceding temperature difference ⁇ Tp calculated last time, the electric wire current value Iw of the electric wire W1, the environmental temperature Ta, and the duty D of the PWM signal as follows [1]. ] And [2], the temperature difference ⁇ Tw is calculated.
  • ⁇ Tw ⁇ Tp ⁇ exp ( ⁇ t / ⁇ r) + Rth ⁇ Rw ⁇ D ⁇ Iw 2 ⁇ (1-exp ( ⁇ t / ⁇ r)) ⁇ ⁇ ⁇ [1]
  • Rw Ro ⁇ (1 + ⁇ ⁇ (Ta + ⁇ Tp-To)) ⁇ ⁇ ⁇ [2]
  • ⁇ Tw, ⁇ Tp, Ta, Iw, Rw, Rth and D each have the calculated temperature difference (° C.), preceding temperature difference (° C.), environmental temperature (° C.), and wire current value (A) of the wire W1.
  • ⁇ t is a cycle (s) for calculating the temperature difference ⁇ Tw, that is, a cycle in which the temperature calculation process is executed.
  • ⁇ r is the electric wire heat dissipation time constant (s) of the electric wire W1.
  • Ro is the wire resistance ( ⁇ ) at the temperature To.
  • ⁇ is the temperature coefficient of wire resistance (/ ° C) of the wire W1.
  • the temperature difference ⁇ Tw, the preceding temperature difference ⁇ Tp, the wire current value Iw, and the environmental temperature Ta are variables.
  • the period ⁇ t, the wire heat dissipation time constant ⁇ r, the wire thermal resistance Rth, the wire resistance Ro, the wire resistance temperature coefficient ⁇ , and the temperature To are preset constants.
  • the first term of the equation [1] decreases as the period ⁇ t becomes longer, the first term of the arithmetic expression [1] represents the heat dissipation of the electric wire W1. Further, since the value of the second term of the formula [1] increases as the period ⁇ t becomes longer, the second term of the formula [1] represents the heat generation of the electric wire W1.
  • the control unit 45 calculates the wire temperature of the wire W2 in the same manner as the wire temperature of the wire W1.
  • the storage unit 44 stores two leading temperature differences corresponding to the two electric wires W1 and W2. Each of the two preceding temperature differences is changed by the control unit 45. Further, the storage unit 44 stores the electric wire temperature table Q1 showing the electric wire temperatures of the electric wires W1 and W2.
  • FIG. 5 is a chart showing the contents of the electric wire temperature table Q1. As shown in FIG. 5, the wire temperature table Q1 shows the wire temperatures of the wires W1 and W2. Each of the wire temperatures shown in the wire temperature table Q1 is changed by the control unit 45.
  • the control unit 45 adjusts the average value of the related values related to the loads B1 and B2 to the target value. In the current reduction process, the control unit 45 changes at least one target value.
  • the wires W1 and W2 correspond to the loads B1 and B2, respectively.
  • the storage unit 44 stores a target value table Q2 showing two target values corresponding to the two loads B1 and B2 and initial values of the two target values.
  • FIG. 6 is a chart showing the contents of the target value table Q2. As shown in FIG. 6, in the target value table Q2, two target values corresponding to the two loads B1 and B2 and initial values of the two target values are shown. Each of the two target values shown in the target value table Q2 is changed by the control unit 45.
  • the control unit 45 waits until the vehicle data is input from the sensor 14a to the input unit 42.
  • the control unit 45 acquires the vehicle data input to the input unit 42.
  • the control unit 45 instructs the communication unit 43 to transmit the acquired vehicle data to the integrated ECU 10, and ends the vehicle data transmission process.
  • the control unit 45 executes the vehicle data transmission process again.
  • FIG. 7 is a flowchart showing the procedure of the temperature calculation process of the electric wire W1.
  • the control unit 45 periodically executes the temperature calculation process of the electric wire W1.
  • the control unit 45 acquires the current value information indicating the electric wire current value of the electric wire W1 from the A / D conversion unit J1 (step S1).
  • the control unit 45 acquires the current value information during the period when the PWM signal indicates a high level voltage.
  • the control unit 45 reads out the preceding temperature difference of the electric wire W1 from the storage unit 44 (step S2). This preceding temperature difference is the temperature difference calculated in the previous temperature calculation process.
  • the control unit 45 acquires the environmental temperature information from the A / D conversion unit 41 (step S3).
  • the control unit 45 calculates the temperature difference between the environmental temperature and the electric wire temperature of the electric wire W1 by substituting a plurality of numerical values into the mathematical formulas [1] and [2] (step S4).
  • the plurality of numerical values are the electric wire current value of the electric wire W1 indicated by the current value information acquired in step S1, the preceding temperature difference read in step S2, the environmental temperature indicated by the environmental temperature information acquired in step S3, and the output unit H1. This is the duty of the PWM signal being output. When the output unit H1 outputs a low level voltage, the duty is zero.
  • the control unit 45 changes the preceding temperature difference stored in the storage unit 44 to the temperature difference calculated in step S4 (step S5). The preceding temperature difference after the change will be used in the next temperature calculation process.
  • the control unit 45 calculates the electric wire temperature of the electric wire W1 by adding the temperature difference calculated in step S4 to the environmental temperature indicated by the environmental temperature information acquired in step S3 (step S6). ).
  • control unit 45 changes the wire temperature of the wire W1 in the wire temperature table Q1 to the wire temperature calculated in step S7 (step S7). After executing step S7, the control unit 45 ends the temperature calculation process of the electric wire W1.
  • the control unit 45 periodically executes the temperature calculation process of the electric wire W1.
  • the temperature calculation process of the electric wire W2 is the same as the temperature calculation process of the electric wire W1.
  • the temperature calculation process of the electric wire W2 is performed by replacing each of the output unit H1, the A / D conversion unit J1 and the electric wire W1 with the output unit H2, the A / D conversion unit J2 and the electric wire W2. Can be explained. Therefore, the control unit 45 acquires the electric wire current values of the two electric wires W1 and W2, and calculates the temperatures of the two electric wires W1 and W2 based on the acquired two electric wire current values.
  • FIG. 8 is a flowchart showing the procedure of the power supply control process of the load B1.
  • the control unit 45 first determines whether or not to operate the load B1 (step S11).
  • step S11 the control unit 45 determines that the load B1 is operated when the communication unit 43 receives instruction data instructing the operation of the two loads B1 and B2.
  • the control unit 45 determines that the load B1 will not be operated if the communication unit 43 has not received the instruction data instructing the operation of the two loads B1 and B2.
  • the control unit 45 executes step S11 again and waits until the communication unit 43 receives instruction data instructing the operation of the two loads B1 and B2. do.
  • control unit 45 determines that the load B1 is to be operated (S11: YES)
  • the control unit 45 acquires the power supply voltage value information from the A / D conversion unit 40 (step S12), and obtains the target value of the load B1 from the target value table Q2. Is read (step S13).
  • the control unit 45 calculates the duty of the PWM signal whose average value of the related values is the target value read in step S13, based on the power supply voltage value indicated by the power supply voltage value information acquired in step S12. Step S14).
  • the load B1 when the load B1 is a headlight having an LED, the brightness of the load B1 increases as the average value of the electric wire current values of the electric wires W1 increases.
  • the relevant value is a wire current value.
  • the target value is the current value.
  • the electric wire current value of the current flowing when the switch 30 of the switch device G1 is on is referred to as a switch current value.
  • the switch current value is calculated based on the power supply voltage value indicated by the power supply voltage value information acquired in step S12.
  • the control unit 45 divides the target value read in step S13 by the switch current value calculated based on the power supply voltage value. As a result, the duty of the PWM signal is calculated.
  • the load B1 when the load B1 is a headlight having an incandescent light bulb, the brightness of the load B1 increases as the average value of the electric power supplied to the load B1 increases. If the load B1 is a headlight with an incandescent bulb, the relevant value is the power supplied to the load B1.
  • the target value is also electric power.
  • the power supplied to the load B1 when the switch 30 of the switch device G1 is on is referred to as load power.
  • the load power is calculated based on the power supply voltage value indicated by the power supply voltage value information acquired in step S12.
  • the control unit 45 divides the target value read in step S13 by the load power calculated based on the power supply voltage value. As a result, the duty of the PWM signal is calculated.
  • the rotation speed of the load B1 is faster as the average value of the voltages applied to the load B1 is higher.
  • the relevant value is the voltage value of the voltage applied to the load B1.
  • the target value is also a voltage value.
  • the voltage value applied to the load B1 when the switch 30 of the switch device G1 is on is referred to as a load voltage value.
  • the load voltage value is calculated based on the power supply voltage value indicated by the power supply voltage value information acquired in step S12.
  • the control unit 45 divides the target value read in step S13 by the load voltage value calculated based on the power supply voltage value. As a result, the duty of the PWM signal is calculated.
  • the control unit 45 instructs the output unit H1 to output a PWM signal having the duty calculated in step S14 (step S15).
  • the drive circuit 31 of the switch device G1 performs PWM control of the switch 30 according to the voltage indicated by the PWM signal.
  • the duty of the PWM control performed by the drive circuit 31 is adjusted to the duty calculated in step S14.
  • the drive circuit 31 performs PWM control of the switch 30, a current flows through the electric wire W1 and the average value of the related values is adjusted to the target value.
  • step S15 the control unit 45 reads out the wire temperature of the wire W1 shown in the wire temperature table Q1 (step S16).
  • step S17 the control unit 45 determines whether or not the wire temperature of the wire W1 read out in step S16 is equal to or higher than the cutoff threshold value (step S17).
  • the control unit 45 determines whether or not to stop the operation of the load B1 (step S18).
  • step S18 the control unit 45 determines that the operation of the load B1 is stopped when the communication unit 43 receives the instruction data instructing the stop of the operation of the two loads B1 and B2.
  • the control unit 45 determines that the operation of the load B1 is not stopped when the communication unit 43 has not received the instruction data instructing the stop of the operation of the two loads B1 and B2.
  • control unit 45 determines that the wire temperature of the wire W1 is equal to or higher than the cutoff threshold value (S17: YES) or determines that the operation of the load B1 is stopped (S18: YES)
  • the control unit 45 outputs a low level voltage to the output unit H1. Is output to stop the power supply to the load B1 via the electric wire W1 (step S19).
  • the output unit H1 outputs a low level voltage
  • the drive circuit 31 of the switch device G1 switches the switch 30 off. As a result, the power supply to the load B1 is stopped.
  • the control unit 45 ends the power supply control process of the load B1.
  • the control unit 45 executes the power supply control process again.
  • the power supply control process is not restarted until a predetermined condition is satisfied.
  • the predetermined condition is, for example, that the electric wire temperature becomes a value close to the environmental temperature.
  • control unit 45 determines that the operation of the load B1 is not stopped (S18: NO)
  • the control unit 45 acquires the power supply voltage value information from the A / D conversion unit 40 (step S20).
  • the control unit 45 reads out the target value of the switch device G1 shown in the target value table Q2 (step S21). Similar to step S14, the control unit 45 determines the duty of the PWM signal whose average value of the related values is the target value read in step S21 based on the power supply voltage value indicated by the power supply voltage value information acquired in step S20. Calculate (step S22). Next, the control unit 45 changes the duty of the PWM signal output by the output unit H1 to the duty calculated in step S22 (step S23), and executes step S16 again.
  • the communication unit 43 when the communication unit 43 does not receive the instruction data instructing the stop of the operation of the two loads B1 and B2 in the state where the wire temperature is less than the cutoff threshold value, it is related based on the power supply voltage value.
  • the duty of the PWM signal is adjusted so that the average value of the values becomes the target value. It is assumed that the positive electrode of the DC power supply 12 is connected to the starter of the vehicle C. The DC power supply 12 supplies power to the starter. When the power supply voltage value of the DC power supply 12 is lowered by the operation of the starter, the duty is increased and the average value of the related values is maintained at the target value. When the power supply voltage value of the DC power supply 12 rises due to the stop of the operation of the starter, the duty decreases and the average value of the related values is maintained at the target value.
  • the drive circuit 31 of the switch device G1 switches the switch 30 off. As a result, the current flow through the electric wire W1 is stopped, and the electric wire temperature of the electric wire W1 is lowered. Therefore, it is possible to prevent the electric wire W1 from becoming abnormally high in temperature.
  • the control unit 45 executes the power supply control process of the load B2 in the same manner as the power supply control process of the load B1.
  • the load B1 other than the load B1 included in the wording "load B1 and B2" is replaced with the load B2.
  • the switch device G1, the output unit H1 and the electric wire W1 are replaced with the switch device G2, the output unit H2, and the electric wire W2, respectively.
  • the control unit 45 calculates the duty of the PWM signal (PWM control) whose target value is the average value of the related values based on the power supply voltage value indicated by the acquired power supply voltage information with respect to the drive circuit 31 of the switch device G2. Then, the duty of the PWM control performed by the drive circuit 31 is changed to the calculated duty.
  • the effect of the power supply control process of the load B2 is the same as the effect of the power supply control process of the load B1.
  • the control unit 45 causes current to flow through the two electric wires W1 and W2 by executing step S15 of the power supply control process of the loads B1 and B2. Further, the control unit 45 executes steps S17 and S18 of the power supply control process of the loads B1 and B2. Therefore, when one of the wire temperatures of the two wires W1 and W2 is equal to or higher than the cutoff threshold value, the control unit 45 stops the current flow through the wire whose wire temperature is the cutoff threshold value.
  • the control unit 45 When the communication unit 43 receives instruction data instructing the operation of the two loads B1 and B2, the control unit 45 outputs a PWM signal to the output units H1 and H2 in step S15 of the power supply control process of the loads B1 and B2. Let me. Therefore, the two loads B1 and B2 operate at the same time.
  • the control unit 45 lowers the output units H1 and H2 to a low level. Output voltage. Therefore, the two loads B1 and B2 stop operating at the same time.
  • ⁇ Current reduction processing> 9 and 10 are flowcharts showing the procedure of the current reduction process.
  • the control unit 45 determines whether or not at least one of the two loads B1 and B2 is operating (step S31).
  • step S31 when at least one of the two output units H1 and H2 outputs a PWM signal, the control unit 45 determines that at least one load is operating.
  • the control unit 45 determines that at least one load B1 and B2 is not operating.
  • the control unit 45 executes step S31 again and waits until at least one of the two loads B1 and B2 is activated.
  • the control unit 45 determines whether or not all the target values shown in the target value table Q2 are initial values (step S32). When the control unit 45 determines that all the target values are the initial values (S32: YES), the control unit 45 reads out all the wire temperatures shown in the wire temperature table Q1 (step S33). Next, the control unit 45 determines whether or not the wire temperature read out in step S33 includes the wire temperature equal to or higher than the temperature threshold value (step S34).
  • the temperature threshold value is a constant value and is stored in the storage unit 44 in advance. The temperature threshold is less than the cutoff threshold.
  • Step S34 When the control unit 45 determines that there is an electric wire temperature equal to or higher than the temperature threshold value (S34: YES), the control unit 45 selects a load corresponding to a normal electric wire having an electric wire temperature lower than the temperature threshold value among all the loads B1 and B2. (Step S35).
  • the normal electric wire is included in the electric wires W1 and W2.
  • step S35 the control unit 45 selects one of all the loads B1 and B2.
  • the electric wire corresponding to the load selected in step S35 is described as the selected electric wire.
  • the selected wire is usually a normal wire.
  • a wire whose wire temperature is equal to or higher than the temperature threshold at the time when the control unit 45 determines that the wire temperature is equal to or higher than the temperature threshold is described as an abnormal wire.
  • the control unit 45 lowers the target value of the load selected in step S35 in the target value table Q2 (step S36). For example, when the control unit 45 lowers the target value of the load B1, the duty of the PWM signal output by the output unit H1 decreases unless the power supply voltage value fluctuates at the same time as the target value decreases. do. As a result, the duty of the PWM control performed by the drive circuit 31 of the switch device G1 is reduced. As a result, the average value of the wire current value of the selected wire decreases. When the power supply voltage value is constant, the smaller the target value, the smaller the duty of the PWM signal. The control unit 45 ends the current reduction process when it is determined that there is no wire temperature equal to or higher than the temperature threshold value (S34: NO) or after step S36 is executed.
  • S34 the temperature threshold value
  • control unit 45 determines that all the target values are not the initial values (S32: NO)
  • the control unit 45 reads out the wire temperature of the abnormal wire in the wire temperature table Q1 (step S37).
  • the control unit 45 determines whether or not the wire temperature of the abnormal wire read in step S37 is less than the temperature threshold value (step S38).
  • the control unit 45 changes all the target values to the initial values (step S39), and ends the current reduction process.
  • the control unit 45 sets the target value to the initial value. return.
  • the average value of the wire current values of the selected wires increases as long as the power supply voltage value of the DC power supply 12 is a constant value.
  • the wire temperature of the abnormal wire drops below the temperature threshold, it means that the abnormal wire has returned to the normal wire.
  • step S40 the control unit 45 reads out the wire temperature of the selected wire in the wire temperature table Q1 (step S40), and reads out the wire temperature of the selected wire. Based on the above, it is determined whether or not the target value, which is less than the initial value, is further lowered (step S41). In step S41, the control unit 45 determines, for example, that the target value is further lowered when the wire temperature of the selected wire is equal to or higher than the temperature threshold value. When the wire temperature of the selected wire is less than the temperature threshold value, the control unit 45 determines that the target value is not further lowered.
  • control unit 45 determines that the target value is further lowered (S41: YES)
  • the control unit 45 further lowers the target value that is less than the initial value (step S42).
  • the control unit 45 ends the current reduction process when it is determined that the target value is not further lowered (S41: NO) or after the step S42 is executed.
  • the control unit 45 executes the current reduction process again and waits until at least one of the loads B1 and B2 is activated.
  • FIG. 11 is a timing chart showing an operation example of the individual ECU 11a.
  • FIG. 11 shows the transition of the voltage of the PWM signal output to the drive circuit 31 of the switch devices G1 and G2 and the transition of the wire temperature of the wires W1 and W2.
  • the power supply voltage value is maintained at a constant value.
  • the high level voltage and the low level voltage are indicated by “H” and “L”, respectively.
  • the cutoff threshold and the temperature threshold are indicated by Tth and Td, respectively.
  • the two output units H1 and H2 of the microcomputer 20 use the PWM signal as the drive circuit 31 of the switch devices G1 and G2, power is supplied to the loads B1 and B2 via the electric wires W1 and W2, and the electric wires of the electric wires W1 and W2.
  • the temperature rises.
  • the wire temperature of the wires W1 and W2 is usually stable at a value less than the temperature threshold value Td as shown in FIG.
  • the control unit 45 selects the switch device G2 in step S35 of the current reduction process, and the output unit H2 outputs the switch device G2 to the drive circuit 31 of the switch device G2.
  • the duty of the PWM signal is reduced.
  • the wire temperature of the wire W2 drops to a lower temperature.
  • the possibility that the wire temperature of the wire W2 becomes a temperature equal to or higher than the cutoff threshold value is reduced.
  • the control unit 45 executes step S19 of the power supply control process of the load B1, and the output unit H1 transfers the low level voltage to the drive circuit 31 of the switch device G1. Output. As a result, the drive circuit 31 of the switch device G1 switches the switch 30 off. As a result, the current flow through the electric wire W1 is stopped, so that the electric wire temperature of the electric wire W1 is lowered.
  • the number of loads to which the DC power supply 12 supplies electric power is two.
  • the number of loads to which the DC power supply 12 supplies power may be 3 or more.
  • the difference between the second embodiment and the first embodiment will be described.
  • Other configurations other than the configurations described later are common to the first embodiment. Therefore, the same reference reference numerals as those in the first embodiment are assigned to the components common to the first embodiment, and the description of the components will be omitted.
  • FIG. 12 is a block diagram showing a configuration of a main part of the individual ECU 11a according to the second embodiment.
  • the control system 1 in the second embodiment includes n loads B1, B2, ..., Bn.
  • n is an integer of 3 or more.
  • the individual ECU 11a is connected to one end of the electric wire Wi.
  • the other end of the electric wire Wi is connected to one end of the load Bi.
  • the other end of the load Bi is grounded.
  • i is an arbitrary integer belonging to a range of 3 or more and n or less. Therefore, i may be any of 3, 4, ..., N.
  • the DC power supply 12 supplies electric power to n loads B1, B2, ..., Bn via n electric wires W1, W2, ..., Wn.
  • the load Bi operates in the same manner as the load B1.
  • the types of all loads B1, B2, ..., Bn are the same.
  • the first example of the related value is the current value of the current supplied to the load Bu.
  • the second example of the related value is the voltage value of the voltage applied to the load Bu.
  • the third example of the related value is the electric power supplied to the load Bu.
  • u is an arbitrary integer belonging to a range of 1 or more and n or less. Therefore, u may be any of 1, 2, ..., N.
  • the individual ECU 11a controls the power supply to the n loads B1, B2, ..., Bn via the n electric wires W1, W2, ... Wn.
  • the individual ECU 11a controls the operation of the n loads B1, B2, ..., Bn by controlling the power supply to the n loads B1, B2, ..., Bn.
  • the integrated ECU 10 determines the operation of n loads B1, B2, ..., B based on one or more vehicle data received from at least one of the individual ECUs 11a and the plurality of individual ECUs 11b.
  • the integrated ECU 10 transmits instruction data instructing the determined operation to the individual ECU 11a.
  • the instruction data transmitted to the individual ECU 11a indicates the operation or stop of the operation of the n loads B1, B2, ..., B.
  • the individual ECU 11a in the second embodiment When the individual ECU 11a in the second embodiment is compared with the individual ECU 11a in the first embodiment, the number of switch devices is different.
  • the individual ECU 11a in the second embodiment has n switch devices G1, G2, ..., Gn.
  • the switch device Gi is configured in the same manner as the switch device G1.
  • Each of the drain and the source of the switch 30 of the switch device Gi is connected to the positive electrode of the DC power supply 12 and one end of the electric wire Wi.
  • the microcomputer 20 outputs a PWM signal or a low level voltage to the drive circuit 31 of the switch device Gi.
  • the configuration of the switch device Gi can be described by replacing the switch device G1 and the electric wire W1 with the switch device Gi and the electric wire Wi. Therefore, the current value information output by the switch device Gi indicates the electric wire current value of the current flowing through the electric wire Wi.
  • n switches 30 are arranged in each of the current paths flowing through the n electric wires W1, W2, ..., Wn.
  • the drive circuit 31 switches the switch 30 on or off.
  • the drive circuit 31 of the switch device Gi functions as a switching circuit.
  • FIG. 13 is a block diagram showing a configuration of a main part of the microcomputer 20.
  • the microcomputer 20 in the second embodiment has n output units H1, H2, ..., Hn and n A / D conversion units J1, J2, ..., Jn.
  • the communication unit 43 transmits vehicle data to the integrated ECU 10 according to the instructions of the control unit 45.
  • the communication unit 43 receives instruction data instructing the operation or stop of the operation of the n loads B1, B2, ..., Bn from the integrated ECU 10.
  • the output unit Hi outputs a PWM signal to the drive circuit 31 of the switch device Gi according to the instruction of the control unit 45.
  • the duty of the PWM signal output by the output unit Hi is adjusted by the control unit 45.
  • the output unit Hi further outputs a low level voltage to the drive circuit 31 of the switch device Gi according to the instruction of the control unit 45.
  • Analog current value information is input from the connection node of the switch device Gi to the A / D conversion unit Ji.
  • the A / D conversion unit Ji converts the input analog voltage value information into digital current value information.
  • the control unit 45 acquires digital current value information from the A / D conversion unit Ji.
  • the current value information acquired from the A / D conversion unit Ji indicates the wire current value of the wire Wi.
  • the control unit 45 executes vehicle data transmission processing, n temperature calculation processing, n power supply control processing, current reduction processing, and the like in parallel.
  • Each of the n temperature calculation processes is a process of calculating the wire temperature of the wires W1, W2, ..., Wn.
  • Each of the n power supply control processes is a process for controlling power supply to the loads B1, B2, ..., Bn.
  • the current reduction process is a process for reducing the electric current values of k electric wires in the electric wires W1, W2, ..., Wn.
  • k is an integer belonging to a range of 2 or more and less than n.
  • wire temperature table Q1 the wire temperatures of n wires W1, W2, ..., Wn are shown. Each of the wire temperatures shown in the wire temperature table Q1 is changed by the control unit 45.
  • target value table Q2 n target values corresponding to n loads B1, B2, ..., Bn and initial values of n target values are shown. Each of the two target values shown in the target value table Q2 is changed by the control unit 45.
  • the control unit 45 periodically executes the temperature calculation process of the electric wire Wi.
  • the temperature calculation process of the electric wire Wi is the same as the temperature calculation process of the electric wire W1.
  • the temperature calculation process of the electric wire Wi is performed by replacing the output unit H1, the A / D conversion unit J1 and the electric wire W1 with the output unit Hi, the A / D conversion unit Ji and the electric wire Wi.
  • the control unit 45 acquires the electric wire current values of n electric wires W1, W2, ..., Wn, and based on the acquired n electric wire current values, the n electric wires W1, W2, ... -Calculate the temperature of Wn.
  • step S11 of the power supply control process of the loads B1 and B2 the control unit 45 is based on whether or not the communication unit 43 has received instruction data instructing the operation of the n loads B1, B2, ..., Bn. Then, as in the first embodiment, it is determined whether or not the load B1 or the load B2 is operated. In step S18, the control unit 45 is the same as in the first embodiment, based on whether or not the communication unit 43 has received instruction data instructing the operation of the n loads B1, B2, ..., Bn to be stopped. In addition, it is determined whether or not to stop the operation of the load B1 or the load B2.
  • the control unit 45 executes the power supply control process of the load Bi in the same manner as the power supply control process of the load B1.
  • the load B1 other than the loads B1, B2, ..., Bn is replaced with the load Bi.
  • the switch device G1, the output unit H1 and the electric wire W1 are replaced with the switch device Gi, the output unit Hi, and the electric wire Wi, respectively. This makes it possible to explain the power supply control process of the load Bi.
  • the control unit 45 calculates the duty of the PWM signal (PWM control) whose target value is the average value of the related values based on the power supply voltage value indicated by the acquired power supply voltage information with respect to the drive circuit 31 of the switch device Gi. Then, the duty of the PWM control performed by the drive circuit 31 is adjusted to the calculated duty.
  • the effect of the power supply control process of the load Bi is the same as the effect of the power supply control process of the load B1.
  • the control unit 45 causes current to flow through the n electric wires W1, W2, ..., Wn by executing step S15 of the power supply control process of the loads B1, B2, ..., Bn. Further, the control unit 45 executes steps S17 and S19 of the power supply control process of the loads B1, B2, ..., Bn. Therefore, when one of the wire temperatures of the n wires W1, W2, ..., Wn is equal to or higher than the cutoff threshold value, the control unit 45 allows current to flow through the wire whose wire temperature is the cutoff threshold value. To stop.
  • the control unit in step S15 of the power supply control process for the loads B1, B2, ..., Bn. 45 causes the output units H1, H2, ..., Hn to output a PWM signal. Therefore, the n loads B1, B2, ..., Bn operate at the same time.
  • the communication unit 43 receives instruction data instructing the stop of the operation of the n loads B1, B2, ..., Bn, in step S19 of the power supply control process of the loads B1, B2, ..., Bn.
  • the control unit 45 causes the output units H1, H2, ..., Hn to output a low level voltage. Therefore, the n loads B1, B2, ..., Bn stop operating at the same time.
  • step S31 of the current reduction process in the second embodiment the control unit 45 implements the control unit 45 based on whether or not at least one of the n output units H1, H2, ..., Hn outputs a PWM signal. Similar to the first embodiment, it is determined whether or not at least one of the n loads B1, B2, ..., Bn is operating.
  • step S35 the control unit 45 selects k loads corresponding to k normal wires whose wire temperature is less than the temperature threshold value among all the loads B1, B2, ..., Bn.
  • the k normal electric wires are included in the n electric wires W1, W2, ..., Wn.
  • step S35 the control unit 45 selects the load corresponding to all the normal electric wires and copes with the insufficient load for one or a plurality of abnormal electric wires. Choose from one or more loads.
  • step S36 the control unit 45 lowers the target values of the k loads selected in step S35 in the target value table Q2.
  • step S40 the control unit 45 reads out the wire temperature of k selected wires in the wire temperature table Q1.
  • step S41 the control unit 45 determines whether or not to further reduce the k target values, which are less than the initial values, based on the wire temperature of the k selected wires read in step S40.
  • step S41 the control unit 45 determines that, for example, when at least one of the wire temperatures of the k selected wires is equal to or higher than the temperature threshold value, the k target values are further lowered. When the wire temperature of the k selected wires is less than the temperature threshold value, the control unit 45 determines that the k target values are not further lowered.
  • step S42 the control unit 45 further lowers the k target values that are less than the initial values.
  • step S41 the control unit 45 separately determines whether or not to further reduce the k target values, which are less than the initial values, based on the wire temperature of the k selected wires read in step S40. You may. In this case, in step S41, one or a plurality of target values to be reduced are lowered among the k target values.
  • the individual ECU 11a in the second embodiment similarly exhibits the effect of the individual ECU 11a in the first embodiment. Therefore, it is unlikely that the wire temperatures of all the wires W1, W2, ..., Wn will be high temperatures equal to or higher than the cutoff threshold. Further, it is unlikely that the wire temperature of the k wires in the n wires W1, W2, ..., Wn becomes a temperature equal to or higher than the cutoff threshold value. Therefore, it is unlikely that the operation of k loads will stop unexpectedly.
  • the integer k is the minimum number of loads for which operation is desired to continue as long as operation is indicated.
  • Each of the output units H1 and H2 outputs a high level voltage in addition to the PWM signal and the low level voltage according to the instruction of the control unit 45.
  • the drive circuit 31 of each of the switch devices G1 and G2 fixes the switch 30 to ON when a high level voltage is input.
  • FIG. 14 is a flowchart showing the procedure of the power supply control process of the load B1 in the third embodiment.
  • the steps S11 and S16 to S19 are similarly executed in the same manner as the power supply control process of the load B1 in the first embodiment. Therefore, the description of steps S11 and S16 to S19 will be omitted.
  • step S51 the control unit 45 instructs the output unit H1 to output the high level voltage to the drive circuit 31 of the switch device G1. As a result, the drive circuit 31 switches the switch 30 on.
  • the control unit 45 executes step S16 after executing step S51.
  • step S16 When the control unit 45 determines that the operation of the load B1 is not stopped (S18: NO), the control unit 45 executes step S16. Therefore, when the communication unit 43 has not received the instruction data instructing to stop the operation of the two loads B1 and B2 in a state where the wire temperature is less than the cutoff threshold value, the switch 30 is fixed to ON.
  • the control unit 45 executes the power supply control process of the load B2 in the same manner as the power supply control process of the load B1.
  • the load B1 other than the loads B1 and B2 is replaced with the load B2.
  • the switch device G1, the output unit H1 and the electric wire W1 are replaced with the switch device G2, the output unit H2, and the electric wire W2, respectively.
  • the power supply control process of the load B2 can be explained.
  • control unit 45 turns on the switch 30 in the drive circuit 31 of each of the switch devices G1 and G2. As a result, the current flows through the electric wires W1 and W2, respectively.
  • step S4 of the temperature calculation process of the electric wire W1 when the output unit H1 outputs a high level voltage, the duty D of the equation [1] is 1.
  • step S4 of the temperature calculation process of the electric wire W2 when the output unit H2 outputs a high level voltage, the duty D of the equation [1] is 1.
  • ⁇ Current reduction processing> 15 and 16 are flowcharts showing the procedure of the current reduction process.
  • the steps S31, S33 to S35, S37, S38, and S40 are similarly executed in the same manner as in the current reduction process in the first embodiment. Therefore, the description of steps S31, S33 to S35, S37, S38, and S40 will be omitted.
  • step S61 when the control unit 45 determines that at least one of the two loads B1 and B2 is operating (S31: YES), the control unit 45 is in the two output units H1 and H2. It is determined whether or not at least one output unit of the above outputs a PWM signal (step S61).
  • the control unit 45 determines that at least one output unit is outputting a PWM signal (S61: YES)
  • the control unit 45 executes step S33.
  • the control unit 45 determines that at least one output unit does not output the PWM signal (S61: NO)
  • step S37 When the control unit 45 determines that at least one output unit does not output the PWM signal (S61: NO), the control unit 45 executes step S37.
  • step S35 the control unit 45 instructs one of the output units H1 and H2 to drive the switch device drive circuit 31 corresponding to the load selected in step S35 among the two switch devices G1 and G2.
  • step S62 the drive circuit 31 to which the PWM signal is input performs PWM control of the switch 30.
  • the duty of the PWM signal is a preset value.
  • the duty of the PWM signal may be a duty calculated based on the target value shown in the target value table Q2 and the power supply voltage value of the DC power supply 12, as in the first embodiment.
  • step S61 the control unit 45 ends the current reduction process. After the current reduction process is completed, the control unit 45 executes the current reduction process again and waits until at least one of the loads B1 and B2 is activated.
  • step S63 the control unit 45 causes all the output units H1 and H2 to output a high level voltage. As a result, all the switches 30 are fixed on. The average value of the wire current value of the selected wire increases. After executing step S63, the control unit 45 ends the current reduction process.
  • step S40 the control unit 45 determines whether or not the duty of the PWM signal output by one of the output units H1 and H2 is further reduced based on the wire temperature of the selected wire read in step S40. Determination (step S64). In step S64, the control unit 45 determines, for example, that the duty is further reduced when the wire temperature of the selected wire is equal to or higher than the temperature threshold value. The control unit 45 determines that the duty is not further reduced when the wire temperature of the selected wire is less than the temperature threshold value.
  • control unit 45 determines that the duty is further reduced (S64: YES)
  • the control unit 45 further reduces the duty of the PWM signal (step S65).
  • the control unit 45 ends the current reduction process when it is determined that the duty is not further reduced (S64: NO) or after the step S65 is executed. After the current reduction process is completed, the control unit 45 executes the current reduction process again and waits until at least one of the loads B1 and B2 is activated.
  • the individual ECU 11a in the third embodiment similarly exhibits other effects other than the effect obtained by changing the duty of the PWM signal based on the power supply voltage value among the effects played by the individual ECU 11a in the first embodiment. Therefore, it is unlikely that the wire temperatures of all the wires W1, W2, ..., Wn will be high temperatures equal to or higher than the cutoff threshold.
  • the configuration of the third embodiment may be expanded to the configuration in which the number of loads is n, just as the configuration of the first embodiment is expanded to the configuration in which the number of loads is n.
  • the power supply control processing, the current reduction processing, and the like of the loads B1, B2, ..., Bn are executed in the same manner as in the third embodiment.
  • the instruction data indicates the operation or stop of the operation of the n loads B1, B2, ..., Bn.
  • the control unit 45 determines whether at least one of the n loads B1, B2, ..., Bn is operating.
  • step S35 of the current reduction process the control unit 45 selects k normal wires whose wire temperature is less than the temperature threshold among all the loads B1, B2, ..., Bn. Select the corresponding k loads.
  • the control unit 45 selects the load corresponding to all the normal electric wires and copes with the insufficient load for one or a plurality of abnormal electric wires. Choose from one or more loads.
  • step S62 after executing step S35, k switches corresponding to the k loads selected in step S35 are instructed to the k output units in the output units H1, H2, ..., Hn.
  • a PWM signal is output to the drive circuit 31 of the device.
  • step S63 the control unit 45 instructs the drive circuits 31 of all the switch devices G1, G2, ..., Gn to fix the switch 30 on.
  • step S40 the control unit 45 reads out the wire temperature of k selected wires in the wire temperature table Q1.
  • step S64 the control unit 45 determines whether or not to further reduce the duty of the k PWM signals based on the wire temperature of the k selected wires read in step S40.
  • step S64 the control unit 45 determines that, for example, when at least one of the wire temperatures of the k selected wires is equal to or higher than the temperature threshold value, the duty of the k PWM signals is further reduced.
  • the control unit 45 determines that the duty of the k PWM signals is not further reduced when the wire temperature of the k selected wires is less than the temperature threshold value.
  • step S64 the control unit 45 further reduces the k PWM signals.
  • step S64 the control unit 45 may separately determine whether or not to further reduce the duty of the k PWM signals based on the wire temperature of the k selected wires read in step S40. .. In this case, in step S64, the duty of one or a plurality of PWM signals to be reduced is reduced among the duties of k PWM signals.
  • the average value of the electric wire current value of the selected electric wire when the average value of the electric wire current value of the selected electric wire is decreased, the average value of the electric wire current value of the abnormal electric wire may also be decreased.
  • the method of adjusting the electric wire current value is not limited to the method of adjusting the duty of the PWM control.
  • the electric wire current value When a variable resistor is arranged in the current path, the electric wire current value may be adjusted by adjusting the resistance value of the variable resistor.
  • the device for calculating the wire temperature is not limited to the individual ECU 11a.
  • the integrated ECU 10 may calculate the wire temperature.
  • the power supply control device that controls power supply is not limited to the individual ECU 11a that communicates with the integrated ECU 10.
  • the number of abnormal wires is not limited to 1, and may be 2 or more. When the number of abnormal electric wires is 2 or more, in step S38 of the current reduction process, it is determined whether or not the electric wire temperatures of all the abnormal electric wires are lower than the temperature threshold value.
  • the number of sensors connected to each of the individual ECU 11a and the plurality of individual ECUs 11b is not limited to 1, and may be 2 or more.
  • the number of actuators 13 connected to each individual ECU 11b is not limited to 1, and may be 2 or more.
  • the switch 30 is not limited to the N-channel type FET, and may be a semiconductor switch, a relay contact, or the like.
  • the semiconductor switch in addition to the N-channel type FET, there are a P-channel type FET, an IGBT (Insulated Gate Bipolar Transistor), a bipolar transistor and the like.
  • Control system 10 Integrated ECU 11a Individual ECU (power supply control device, in-vehicle control device) 11b Individual ECU 12 DC power supply 13 Actuator 14a, 14b Sensor 20 Microcomputer 21 Voltage detection unit 22 Temperature detection unit 30 Switch 31 Drive circuit (switching circuit) 32 Current output unit 33 Resistance 40,41 A / D conversion unit 42 Input unit 43 Communication unit (receiver unit) 44 Storage unit 45 Control unit (processing unit) 46 Internal bus A Storage medium B1, B2, ..., Bn load C Vehicle G1, G2, ..., Gn switch device H1, H2, ..., Hn output unit J1, J2, ..., Jn A / D converter P Computer program Q1 Wire temperature table Q2 Target value table W1, W2, ..., Wn Wire

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  • Direct Current Feeding And Distribution (AREA)
  • Dc-Dc Converters (AREA)
PCT/JP2021/037875 2020-10-28 2021-10-13 給電制御装置、車載制御装置及び給電制御方法 Ceased WO2022091783A1 (ja)

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JP2012125072A (ja) * 2010-12-09 2012-06-28 Yazaki Corp 車両用電力分配装置
JP2015057017A (ja) * 2013-09-13 2015-03-23 株式会社オートネットワーク技術研究所 制御装置
JP2020036461A (ja) * 2018-08-30 2020-03-05 株式会社オートネットワーク技術研究所 給電制御装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012125072A (ja) * 2010-12-09 2012-06-28 Yazaki Corp 車両用電力分配装置
JP2015057017A (ja) * 2013-09-13 2015-03-23 株式会社オートネットワーク技術研究所 制御装置
JP2020036461A (ja) * 2018-08-30 2020-03-05 株式会社オートネットワーク技術研究所 給電制御装置

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