WO2023074070A1 - 車両制御装置 - Google Patents

車両制御装置 Download PDF

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Publication number
WO2023074070A1
WO2023074070A1 PCT/JP2022/028994 JP2022028994W WO2023074070A1 WO 2023074070 A1 WO2023074070 A1 WO 2023074070A1 JP 2022028994 W JP2022028994 W JP 2022028994W WO 2023074070 A1 WO2023074070 A1 WO 2023074070A1
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WO
WIPO (PCT)
Prior art keywords
temperature
vehicle
temperature sensor
value
wire harness
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/JP2022/028994
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English (en)
French (fr)
Japanese (ja)
Inventor
洋 中野
信康 金川
隆夫 福田
賢太郎 十文字
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.)
Astemo Ltd
Original Assignee
Hitachi Astemo 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 Hitachi Astemo Ltd filed Critical Hitachi Astemo Ltd
Priority to EP22886406.2A priority Critical patent/EP4424560A4/en
Priority to CN202280067602.1A priority patent/CN118076516A/zh
Priority to US18/700,364 priority patent/US20240399981A1/en
Publication of WO2023074070A1 publication Critical patent/WO2023074070A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a fuel injection valve control device and a fuel injection valve control method.
  • Fuses that melt due to overcurrent are used in electrical and electronic devices to prevent overheating and smoke due to overcurrent.
  • a thick wire harness is used for connection, which reduces man-hours for replacement. and the weight of wire harnesses, etc. Therefore, in recent years, a method of realizing a conventional fuse function using a semiconductor switch using a power semiconductor and a temperature estimation technique has been used.
  • the method using this temperature estimation technology detects the current value flowing through the wire harness, estimates the heating temperature of the wire harness by calculation using this current value, and detects the semiconductor switch before the wire harness smokes or catches fire. It blocks and protects If the overcurrent is eliminated by performing overheat protection using such a semiconductor switch, the semiconductor switch can be turned on again to restore the power supply, eliminating the need to replace the parts required when using a fuse. can be In addition, since there is no need to consider variations in melting characteristics of conventional fuses, it is possible to use wire harnesses that are thinner than conventional fuses, thereby reducing weight and cost.
  • Patent Document 1 describes an overheating protection technology that uses temperature estimation of such semiconductor switches and wire harnesses.
  • the current passing through the load is detected at predetermined time intervals in order to protect the electric wire used for supplying power from the power supply to the load.
  • the temperature rise of the wire is calculated using a relational expression relating to the detected energized current and the heat dissipation and heat generation of the wire, and the calculated temperature rise is added to the reference temperature to estimate the temperature of the wire.
  • the estimated wire temperature reaches or exceeds a predetermined upper limit temperature, power supply from the power source to the load is stopped to protect the wire.
  • the amount of temperature rise due to self-heating of the wire harness due to current is calculated, and this temperature rise is added to the reference temperature, which is the environmental temperature where the wire harness is laid. I'm guessing.
  • the estimated temperature will be erroneous, and there is a possibility that the semiconductor switch cannot be turned off at an appropriate temperature.
  • the estimated temperature is higher than the actual temperature, the amount of current that can be supplied is reduced and abrupt tripping of the semiconductor switch may occur, thereby reducing the amount of available current.
  • the estimated temperature is lower than the actual temperature, there is a risk that the wire harness will smoke or catch fire because the semiconductor switch will not shut off at the appropriate shutoff threshold.
  • the temperature distribution in the engine room changes depending on the type of vehicle, the size of the engine, and the layout of parts.
  • the present application includes a plurality of means for solving the above problems.
  • a current detection for detecting a current flowing through a wire harness that supplies power to in-vehicle equipment mounted in a vehicle as a vehicle control device.
  • a reference temperature generation unit that obtains a reference temperature using a detection value of a predetermined temperature sensor out of a plurality of temperature sensors mounted on the vehicle or a predetermined value according to the running state or environment of the vehicle;
  • a temperature estimator that calculates the estimated temperature of the wire harness using the current detection value from the current detection element and the reference temperature value obtained by the reference temperature generator, and a cutoff determination based on the estimated temperature estimated by the temperature estimator and an interrupting element that interrupts the current flowing through the wire harness based on the determination by the interruption determining unit.
  • the reference temperature used for estimating the temperature of the wire harness can be set to an optimum temperature according to the running state and the running environment, and the wire harness can be reliably measured without excessively limiting the amount of current that can be supplied. Overheating of the harness can be detected and cut off.
  • a temperature sensor that detects the temperature of the area where the wire harness is installed, it is possible to obtain a more accurate environmental temperature, so the design margin can be relaxed and the wire harness can be designed with a thinner one. becomes possible.
  • FIG. 1 is a configuration diagram of a vehicle control device according to a first embodiment of the present invention
  • FIG. FIG. 4 is a cross-sectional view showing a heat radiation path of the wire harness, for explaining temperature estimation processing in the first embodiment of the present invention
  • FIG. 4 is a circuit diagram showing a heat dissipation model as an equivalent thermal circuit network for explaining temperature estimation processing in the first embodiment of the present invention
  • 4 is a block diagram showing the circuit of FIG. 3 converted into a transfer function in which the input is the heating value Pw and the output is the conductor temperature Tc.
  • FIG. FIG. 2 is a configuration diagram showing a specific configuration example (Example 1) of a reference temperature generation unit of the vehicle control device in the first embodiment of the present invention
  • FIG. 4 is a configuration diagram showing a specific configuration example (example 2) of a reference temperature generation unit of the vehicle control device in the first embodiment of the present invention
  • 1 is a configuration diagram in which a vehicle control device according to a first embodiment of the invention is applied to a vehicle with an engine
  • FIG. 1 is a configuration diagram in which a first embodiment of the present invention is applied to a vehicle with a motor
  • FIG. 10 is a configuration diagram of a vehicle control device according to a second embodiment of the present invention
  • FIG. 10 is a characteristic diagram showing an operation example (example 1) of the vehicle control device in the second embodiment of the present invention
  • FIG. 9 is a characteristic diagram showing an operation example (example 2) of the vehicle control device in the second embodiment of the present invention
  • FIG. 11 is a configuration diagram of a vehicle control device according to a third embodiment of the present invention
  • FIG. 11 is a configuration diagram of a vehicle control device according to a fourth embodiment of the present invention
  • a vehicle control device is a control device for a device (in-vehicle device) that is installed in a vehicle that is a moving body such as an automobile and that is mounted on the vehicle.
  • a vehicle control device functions as a heating protection system for a wire harness, which is a cable connected to an in-vehicle device.
  • FIG. 1 is a diagram showing the basic configuration of a wire harness heating protection system 1 in a vehicle control device to which the first embodiment is applied.
  • the current detecting element 2 detects the current flowing through the wire harness (not shown) as the current value Iw.
  • the first temperature sensor 3a and the second temperature sensor 3b are temperature sensors mounted on the vehicle, and are temperature sensors of equipment mounted near the area where the wire harness is laid. In other words, the first temperature sensor 3a and the second temperature sensor 3b are not installed to detect the temperature of the wire harness, but are installed to monitor the state of the in-vehicle equipment, the state of the air conditioner, and the like. is. Specific examples of the first temperature sensor 3a and the second temperature sensor 3b will be described later.
  • the fixed value 4 is a temperature setting value that is a predetermined temperature used when the first temperature sensor 3a and the second temperature sensor 3b are not used.
  • the fixed value 4 is the design maximum value of the environmental temperature of the area where the wire harness is laid. Note that the fixed value 4 is not a single value but a design parameter that is set to an arbitrary value for each wiring harness installation area.
  • the reference temperature generator 5 uses the first temperature sensor 3a, the second temperature sensor 3b, and a fixed value to generate the reference temperature Ta, which is the ambient temperature of the wire harness.
  • the reference temperature generation unit 5 acquires environmental information such as the vehicle operating state such as whether the vehicle is running or stopped and the vehicle ambient temperature as the vehicle operating state information 9 from another control device.
  • a reference temperature Ta is generated based on the operating state information 9 .
  • the temperature estimation unit 6 uses the current value from the current detection element 2 and the reference temperature Ta from the reference temperature generation unit 5 to estimate and calculate the heating temperature of the wire harness. This estimation calculation is performed using a model based on the calorific value and heat dissipation characteristics of the wire harness to be estimated. An example of a specific estimation method will be described later.
  • the cutoff determination unit 7 outputs a cutoff instruction when the estimated temperature of the wire harness estimated by the temperature estimation unit 6 exceeds a predetermined threshold.
  • the interruption element 8 interrupts the current flowing through the wire harness based on the interruption instruction from the interruption determination unit 7 .
  • a semiconductor switch made of a power semiconductor is used as the interrupting element 8 .
  • FIG. 2 is a cross-sectional view showing the heat radiation path of the wire harness in the temperature estimating section 6.
  • a wire harness is composed of a conductor portion Wa through which current flows and an insulator Wb that covers the conductor portion Wa.
  • Joule heat is generated due to the resistance of the conductor Wa, generating heat Pw.
  • the heat Pw is accumulated in the heat capacity C1 of the conductor Wa and at the same time is thermally conducted to the insulator Wb.
  • heat is accumulated in the heat capacity C2 of the insulator Wb, and the heat is conducted to the surface of the insulator Wb via the thermal resistance R2 of the insulator Wb. Then, the heat is radiated to the surrounding air on the surface of the insulator Wb. Heat dissipation to the surrounding air is determined by a thermal resistance R3 determined by a heat transfer coefficient and radiant heat.
  • FIG. 3 is a circuit diagram showing this heat dissipation model as an equivalent thermal network.
  • heat P corresponding to the heat generation Pw shown in FIG. 2 is transmitted through the wire harness Twire.
  • the heat P is connected in series with the thermal resistance R2 of the edge body Wb and the thermal resistance R3 when dissipating heat to the surrounding air.
  • the heat capacity C1 of the conductor Wa and the heat capacity C2 of the insulator Wb are connected to the wire harness Twire.
  • Ta is a reference temperature.
  • FIG. 4 is a block diagram in which the equivalent circuit of FIG. 3 is converted into a transfer function whose input is the heating value Pw and whose output is the conductor temperature Tc.
  • a reference temperature Ta is added to a value obtained by an arithmetic expression using a transfer function, with heat generation Pw as an input, heat capacity C1, heat capacity C2, and heat resistances R2 and R3.
  • a calculation is performed to obtain the conductor temperature Tc.
  • the wire harness temperature is estimated based on the transfer function shown in FIG.
  • FIG. 5 shows a configuration using a reference temperature generator 5a, which is one specific example (example 1) of the reference temperature generator 5.
  • the configuration other than the reference temperature generator 5a is the same as the configuration already explained in FIG.
  • the temperature T1 and the temperature T2 from the first temperature sensor 3a and the second temperature sensor 3b are input to the reference temperature generator 5a. Further, information 9a regarding the vehicle speed v is input to the reference temperature generator 5a.
  • the configuration for switching when the vehicle speed becomes 0 m/s is shown, but the reference temperature generation processing is not limited to this, and for example, a configuration for switching when the vehicle speed becomes low even while traveling may be employed. can also Moreover, it is also possible to switch after a certain period of time has passed after stopping, and the switching condition can be set arbitrarily. In the example shown in FIG. 5, an example using two temperature sensors is shown, but the present invention is not limited to this. , the temperature from two or more temperature sensors may be switched.
  • FIG. 6 shows a configuration using a reference temperature generator 5b, which is another specific example (example 2) of the reference temperature generator 5.
  • the configuration other than the reference temperature generator 5b is the same as the configuration already described in FIG.
  • the temperature T1 and the temperature T2 from the first temperature sensor 3a and the second temperature sensor 3b are input to the reference temperature generator 5b.
  • Information 9a on the vehicle speed v is input to the reference temperature generator 5b.
  • the reference temperature generator 5b outputs a weighted average value obtained by weighting the temperature T1 and the temperature T2 with the parameter a according to the vehicle speed v as the reference temperature Ta.
  • the reference temperature Ta is set according to the vehicle speed as the running state of the vehicle. As a result, the reference temperature smoothly changes from the sensor-detected temperature to the fixed value, and better temperature estimation can be performed.
  • the relationship between the weighting parameter a and the velocity v is not limited to the conditions described above, but is a parameter that can be arbitrarily designed. Also, the example of FIG. 6 also shows an example using two temperature sensors, but the present invention is not limited to this. good.
  • FIG. 7 shows a specific example in which the vehicle control device of this embodiment is applied to a vehicle.
  • an intake air temperature sensor of an engine, an outside air temperature sensor of an air conditioner, or the like, which is an outside air temperature sensor for detecting the outside air temperature of the vehicle, is used as the first temperature sensor 3a.
  • the second temperature sensor 3b is used as the first temperature sensor 3a.
  • the wire harness 10 is connected to a current sense MOS-FET 8a as a cutoff element 8, and the current sense MOS-FET 8a is connected to the battery 11.
  • the current sense MOS-FET 8 a has an input terminal for a cutoff signal that cuts off the current flowing through the wire harness 10 and a current detection element that outputs a minute current proportional to the current flowing through the wire harness 10 .
  • An output current from the current detection element flows through the resistor 12 and is converted into a voltage value. This voltage value is equivalent to a signal indicating the current flowing through the wire harness 10 .
  • the engine 20, the first temperature sensor 3a that detects the intake air temperature and the outside air temperature, the second temperature sensor 3b that is the engine cooling water temperature sensor, and the wire harness 10 shown in FIG. 7 are arranged in the front area of the vehicle. .
  • the calculator 13 includes a reference temperature generator 5 , a temperature estimator 6 , an interruption determination unit 7 and a drive manager 14 .
  • a microcomputer or the like can be used as the calculator 13 .
  • the temperature information from the first temperature sensor 3a and the second temperature sensor 3b and the vehicle speed information 9a are input to the reference temperature generator 5 .
  • a reference temperature Ta output from the reference temperature generator 5 is input to the temperature estimator 6 .
  • a voltage value V (Iw) of the resistor 12 indicating the current flowing through the wire harness 10 is input to the temperature estimator 6 .
  • the temperature estimator 6 estimates the temperature of the wire harness 10 using the reference temperature Ta and the voltage value V(Iw) by the method described above.
  • the cutoff determination unit 7 makes a cutoff determination based on the result estimated by the temperature estimation unit 6 . If the estimated temperature value is higher than a predetermined threshold value, a shutdown command is output to the drive management unit 14 .
  • the drive management unit 14 receives a load device drive command 17 from the outside and outputs a drive signal to the current sense MOS-FET 8a.
  • the current sense MOS-FET 8a is turned on by a drive signal to supply power to the load device.
  • the drive management unit 14 receives the cutoff command from the cutoff determination unit 7, it forcibly sends a cutoff signal to the current sense MOS-FET 8a to cut off the current flowing through the wire harness 10.
  • the intake air temperature sensor value and the outside air temperature sensor value of the engine close to the outside air temperature are set as the reference temperatures.
  • the temperature values of the cooling water temperature sensor, the oil temperature sensor, etc., which are close to the engine temperature are set as the reference temperature.
  • the front area of the vehicle is equipped with high temperature and large heat capacity equipment such as the engine.
  • the estimated temperature of the wire harness if the reference temperature Ta is set based on the maximum temperature of the area where the wire harness is always laid, the estimated temperature of the wire harness will be too high and the amount of current to be supplied will be excessively limited.
  • the temperature sensor that is the source of the reference temperature Ta is switched according to the running state, so that the estimated temperature is based on the reference temperature that is more realistic, and excessive current limitation can be avoided. can be done.
  • the intake air temperature sensor of the engine and the outside air temperature sensor of the air conditioner were used as the first temperature sensor 3a, but each temperature sensor is not limited to this, and similar temperatures are obtained. Other temperature sensors may be used as long as the configuration allows. Further, although the cooling water temperature sensor is used as the temperature of the engine, the engine temperature is not limited to this, and any configuration that can acquire a similar temperature such as the oil temperature of the engine may be used.
  • the weighted average value may be output as the reference temperature Ta.
  • FIG. 8 shows a configuration example of the front area of an electric vehicle in which the vehicle driving device is a motor.
  • the heat source mounted in the front area is the drive motor. Therefore, a motor cooling water temperature sensor that indicates the temperature of the motor can be used as the second temperature sensor 3b.
  • the reference temperature generator 5 receives the temperature from the first temperature sensor 3a that detects the outside air temperature obtained from an air conditioner or the like and the temperature from the motor cooling water temperature sensor 3b that detects the temperature of the motor. is entered.
  • the reference temperature generator 5 outputs the value of the first temperature sensor 3a that detects the outside air temperature as the reference temperature value Ta.
  • the value of the second temperature sensor 3b indicating the cooling water temperature of the motor is output as the reference temperature Ta. In this manner, even in an electric vehicle, the temperature of the outside air is switched to the temperature of the in-vehicle equipment according to the vehicle speed as the running state of the vehicle.
  • FIG. 9 to 11 parts corresponding to those in FIGS. 1 to 8 described in the first embodiment are denoted by the same reference numerals.
  • the vehicle control apparatus of this embodiment is also installed in a vehicle, which is a moving body such as an automobile, and is a control apparatus for an in-vehicle device mounted on the vehicle.
  • the vehicle control device of the second embodiment also has a function as a heating protection system for a wire harness, which is a cable connected to the vehicle-mounted device.
  • FIG. 9 shows the configuration of a wire harness heating protection system in a vehicle control device to which the present embodiment is applied.
  • the current detection element 2 detects the current flowing through the wire harness.
  • the temperature sensor 3a is a temperature sensor mounted on the vehicle, and is installed in equipment mounted in the vicinity of the area where the wire harness is laid.
  • a fixed value 4 is a temperature setting value used when the temperature sensor 3a is not used.
  • the fixed value 4 is the design maximum value of the environmental temperature in the area where the wire harness is laid.
  • a fixed value 4 is a design parameter that is set to an arbitrary value (predetermined value) instead of being fixed to one value.
  • the reference temperature generation unit 5c generates the ambient temperature of the wire harness (reference temperature Ta in temperature estimation) using the temperature sensor 3a, the fixed value 4, and the environmental temperature of the vehicle.
  • the reference temperature generation unit 5c generates a reference temperature Ta based on the vehicle environment temperature information 9b.
  • the temperature estimator 6 estimates and calculates the heating temperature of the wire harness using the current value from the current detection element 2 and the reference temperature from the reference temperature generator 5c. This estimation calculation is performed using a model based on the calorific value and heat dissipation characteristics of the wire harness to be estimated. The model based on the amount of heat generated and the heat dissipation characteristics of the wire harness is as described in the first embodiment.
  • the cutoff determination unit 7 outputs a cutoff instruction to the cutoff element 8 when the estimated temperature of the wire harness estimated by the temperature estimator 6 exceeds a predetermined threshold.
  • the interruption element 8 interrupts the current flowing through the wire harness based on the interruption instruction from the interruption determination unit 7 .
  • a semiconductor switch made of a power semiconductor is used as the interrupting element 8 .
  • FIG. 10 shows an operation example (example 1) of the reference temperature generator 5c in this embodiment.
  • the vertical axis of FIG. 10 is the temperature detected by the temperature sensor 3a, and the horizontal axis is the environmental temperature.
  • the solid line characteristic Ta in FIG. 10 is the characteristic of the reference temperature, and the broken line characteristic Ts is the value of the temperature sensor 3a.
  • the reference temperature generator 5c switches between the temperature value of the temperature sensor 3a and the fixed value 4 according to the ambient temperature of the vehicle.
  • the value of the temperature sensor 3a is output as the reference temperature Ta.
  • the constant temperature Tth is 80° C., for example.
  • the difference between the detected value Ts of the temperature sensor 3a and the reference temperature Ta is guaranteed to be within a constant error.
  • This range is the temperature sensor compensation range tx. In the sensor guaranteed range tx (environmental temperature ⁇ range) where the temperature detected by the temperature sensor 3a is equal to or lower than the constant temperature Tth, the reference temperature generator 5c uses the detected temperature Ts of the temperature sensor 3a as the reference temperature.
  • the measurement error becomes higher or lower than the actual temperature. That is, there is a tendency for variation ty to occur due to individual differences in the temperature sensors 3a. In such a case, if the temperature value of the temperature sensor 3a is used as the reference temperature, an error occurs in the estimated temperature of the wire harness. It may cause smoke or fire without shutting off.
  • the reference temperature is switched to the fixed value 4 in the range ⁇ where the error in the detected value of the temperature sensor 3a is large and the temperature value is unreliable.
  • the fixed value 4 here is set to a value that is the maximum design temperature at the location where the wire harness is laid.
  • the estimated temperature of the wire harness is estimated to be higher than the actual temperature, so it is possible to reliably cut off the wire harness before smoke or fire occurs.
  • the temperature can be estimated on the safe side when the temperature sensor 3a is unreliable.
  • the value of the temperature sensor 3a can be used, but other temperature sensors may be used as long as it can be detected that the value of the temperature sensor 3a is an unreliable condition. .
  • FIG. 11 shows another operation example (example 2) of the reference temperature generator 5c in this embodiment.
  • the configuration is shown in which the temperature value of the temperature sensor 3a is switched to the fixed value 4 when the temperature value falls within the unreliable condition range ⁇ .
  • it instead of switching to a fixed value at a certain value, it is configured to gradually switch to a fixed value. For example, after the temperature detected by the temperature sensor 3a exceeds a certain temperature Tth, within a certain temperature range ⁇ , the weighted average of the value of the temperature sensor 3a and the value of the fixed value 4 is used as the reference temperature. Then, in the range ⁇ where the ambient temperature is even higher, the fixed value is used as the reference temperature.
  • the configuration when the temperature detected by the temperature sensor 3a, which is proportional to the ambient temperature, exceeds the predetermined threshold value Tth, the configuration is switched to a fixed value. is set as appropriate, and is not determined to be one value.
  • the temperature sensor 3a is used in this embodiment, a configuration in which a plurality of temperature sensors are connected may be employed.
  • the vehicle control apparatus of this embodiment is also installed in a vehicle, which is a moving body such as an automobile, and is a control apparatus for an in-vehicle device mounted on the vehicle.
  • This vehicle control device also has a function as a heating protection system for a wire harness, which is a cable connected to the vehicle-mounted device.
  • FIG. 12 shows the configuration of a wire harness heating protection system in a vehicle control device to which the present embodiment is applied.
  • a plurality of temperature values from the first temperature sensor 3a and the second temperature sensor 3b are input to the reference temperature generator 5d.
  • the first temperature sensor 3a detects the temperature of intake air of the engine
  • the second temperature sensor 3b detects the outside air temperature mounted on the air conditioner.
  • both temperature sensors detect a temperature value based on the outside air temperature, and it is preferable that the first temperature sensor 3a and the second temperature sensor 3b detect the temperature of the same part or place.
  • the reference temperature generation unit 5d compares the plurality of temperature values, and if the difference between these temperature values is smaller than a predetermined value, the reference temperature generation unit 5d The obtained temperature value is output as the reference temperature Ta.
  • the reference temperature generator 5d outputs a fixed value of 4 as the reference temperature Ta.
  • the reference temperature generator 5d outputs a fixed value of 4 as the reference temperature Ta.
  • the value of the fixed value 4 is set to the designed maximum temperature of the location where the wire harness whose temperature is to be estimated is installed.
  • the first temperature sensor 3a and the temperature sensor 3b may be sensors other than the above-described sensor for detecting the temperature of the intake air of the engine or the temperature sensor for detecting the outside air temperature of the air conditioner. Any combination that can detect the failure of the sensor 3a and the second temperature sensor 3b may be used. Also, the first temperature sensor 3a and the second temperature sensor 3b are appropriately selected according to the installation location of the wire harness whose temperature is to be estimated.
  • FIG. 13 portions corresponding to those in FIGS. 1 to 12 described in the first to third embodiments are denoted by the same reference numerals.
  • the vehicle control device of this embodiment As in the first to third embodiments, it is installed in a vehicle, which is a moving body such as an automobile, and is a control device for an in-vehicle device mounted on the vehicle.
  • the vehicle control device has a function as a heating protection system for a wire harness, which is a cable connected to the vehicle-mounted device.
  • the vehicle in which the vehicle control device of this embodiment is installed is a so-called hybrid vehicle having both an engine and a motor.
  • hybrid vehicle having both an engine and a motor.
  • any hybrid type may be used.
  • FIG. 13 shows the configuration of a wire harness heating protection system in a vehicle control device to which the present embodiment is applied.
  • the temperature value from the first temperature sensor 3a a plurality of temperature values from the two second temperature sensors 3b-1 and 3b-2, and the second temperature sensor The temperature value from 3b is entered.
  • the first temperature sensor 3a a sensor mounted on the air conditioner for detecting the outside air temperature is used.
  • the second temperature sensor 3b-1 one of the two prepared second temperature sensors, an engine temperature sensor for detecting the temperature of the cooling water of the engine is used.
  • An engine oil temperature sensor may be used instead of the engine coolant temperature sensor.
  • a motor cooling water temperature sensor is used as the other second temperature sensor 3b-1.
  • the reference temperature generation unit 5e acquires the information 9 on the vehicle operating state, and selects a temperature, which is adopted as the reference temperature Ta according to the vehicle speed, from the first temperature sensor 3a and the second temperature sensor 3b-1 or 3b-. 2 is the same as the reference temperature generator 5a described as the first embodiment.
  • the switching according to the vehicle speed is, for example, switching depending on whether the vehicle is running or stopped.
  • two second temperature sensors 3b-1 and 3b-2 are provided, and the reference temperature generator 5e controls the two second temperature sensors 3b-1 and 3b-2.
  • the reference temperature generation unit 5e selects the temperature detected by the two second temperature sensors 3b-1 and 3b-2 which is the higher detected temperature.
  • the temperatures detected by the second temperature sensors 3b-1 and 3b-2 are used as reference temperatures.
  • the fixed value 4 is used as the reference temperature.
  • the fixed value 4 may be used as the reference temperature.
  • an engine temperature sensor a motor cooling water temperature sensor, an air conditioner-mounted sensor for detecting the outside air temperature, etc.
  • Any other sensor installed in the vehicle may be used as long as the sensor measures the temperature in the vicinity of the wire harness for which the temperature is to be estimated.
  • the engine temperature sensor various temperature sensors installed in or near the engine, such as an engine oil temperature sensor, can be used in addition to the engine cooling water temperature sensor.
  • control lines and information lines that are considered necessary for explanation are shown, and not all control lines and information lines are necessarily shown on the product. In practice, it may be considered that almost all configurations are interconnected.
  • the program for realizing the overheating protection system of the vehicle control device is prepared in the non-volatile storage or memory in the computer, or in an external memory. , an IC card, an SD card, an optical disk, or other recording medium for transfer.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Air-Conditioning For Vehicles (AREA)
PCT/JP2022/028994 2021-10-29 2022-07-27 車両制御装置 Ceased WO2023074070A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP22886406.2A EP4424560A4 (en) 2021-10-29 2022-07-27 VEHICLE CONTROL DEVICE
CN202280067602.1A CN118076516A (zh) 2021-10-29 2022-07-27 车辆控制装置
US18/700,364 US20240399981A1 (en) 2021-10-29 2022-07-27 Vehicle control device

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