WO2021038999A1 - Vehicle-mounted device - Google Patents

Vehicle-mounted device Download PDF

Info

Publication number
WO2021038999A1
WO2021038999A1 PCT/JP2020/021248 JP2020021248W WO2021038999A1 WO 2021038999 A1 WO2021038999 A1 WO 2021038999A1 JP 2020021248 W JP2020021248 W JP 2020021248W WO 2021038999 A1 WO2021038999 A1 WO 2021038999A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
vehicle
unit
signal
monitoring unit
Prior art date
Application number
PCT/JP2020/021248
Other languages
French (fr)
Japanese (ja)
Inventor
鈴木　靖彦
吉昭 我妻
Original Assignee
株式会社Ｊｖｃケンウッド
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 株式会社Ｊｖｃケンウッド filed Critical 株式会社Ｊｖｃケンウッド
Publication of WO2021038999A1 publication Critical patent/WO2021038999A1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones

Definitions

  • This disclosure relates to an in-vehicle device.
  • the in-vehicle device uses the battery provided in the vehicle as a power source, and may operate by the electric power supplied from the battery.
  • the in-vehicle device may be reset when the power supply voltage due to the battery fluctuates. For example, when the current consumption is large and the voltage drops below the operating voltage of the in-vehicle device, the in-vehicle device may be reset.
  • the sound output may be stopped, shock noise may be generated, or the display screen may become a black image.
  • Patent Document 1 discloses a system using a battery as a power source.
  • a shutdown signal is sent to the power supply circuit to stop the power supply.
  • the present embodiment has been made in view of the above, and an object thereof is to provide an in-vehicle device that does not give a sense of discomfort to the user.
  • the in-vehicle device has an operating unit that performs a predetermined operation by a supply voltage supplied from an external power supply provided in the vehicle, and a predetermined supply voltage.
  • a reset unit that resets the own device when the voltage drops below the first threshold value
  • a voltage monitoring unit that detects that the supply voltage has dropped below a predetermined second threshold value higher than the predetermined first threshold value.
  • the voltage monitoring unit includes an adjusting unit that suppresses the current consumption of the operating unit.
  • FIG. 1 is a diagram showing a configuration example of an in-vehicle device according to the first embodiment of the present disclosure.
  • FIG. 2 is a diagram showing a detailed configuration example of the in-vehicle device according to the first embodiment.
  • FIG. 3 is a flowchart showing the operation of the in-vehicle device according to the first embodiment.
  • FIG. 4 is a diagram showing a configuration example of an in-vehicle device according to the second embodiment of the present disclosure.
  • FIG. 5 is a diagram showing a detailed configuration example of the vehicle-mounted device according to the second embodiment.
  • FIG. 6 is a flowchart showing the operation of the in-vehicle device according to the second embodiment.
  • FIG. 1 is a diagram showing a configuration example of an in-vehicle device according to the first embodiment of the present disclosure.
  • FIG. 2 is a diagram showing a detailed configuration example of the in-vehicle device according to the first embodiment.
  • FIG. 3 is a flowchart showing
  • FIG. 7 is a diagram showing a configuration example of an in-vehicle device according to the third embodiment of the present disclosure.
  • FIG. 8 is a diagram showing a detailed configuration example of the vehicle-mounted device according to the third embodiment.
  • FIG. 9 is a flowchart showing the operation of the in-vehicle device according to the third embodiment.
  • FIG. 1 is a diagram showing a configuration example of an in-vehicle device according to the first embodiment of the present disclosure.
  • the in-vehicle device 1 operates by a voltage supplied from an external power source 2, that is, a supply voltage.
  • the in-vehicle device 1 is, for example, a car navigation device or a car stereo that outputs sound (that is, an in-vehicle sound device).
  • the external power supply 2 supplies a voltage to the in-vehicle device 1.
  • the external power supply 2 is, for example, a battery that supplies a DC voltage.
  • the external power supply 2 is provided in the same vehicle as the in-vehicle device 1.
  • the speaker 3 receives an electric signal output from the in-vehicle device 1 as an input.
  • the speaker 3 converts an electric signal into sound.
  • the speaker 3 is a speaker mounted on the vehicle.
  • the in-vehicle device 1 includes a power supply noise filter 11, an audio unit 12, a voltage detection unit 13, a reset signal generation unit 14, a system control unit 15, a constant voltage generation unit 16, a voltage drop monitoring unit 17, and a volume. It has an adjustment signal generation unit 18.
  • the power supply noise filter 11 removes noise from the power supply voltage supplied from the external power supply 2.
  • the power supply noise filter 11 is composed of, for example, an inductor and a capacitor.
  • the audio unit 12 is an operating unit that performs a predetermined operation by the supply voltage supplied from the external power supply 2.
  • the predetermined operation is an operation of outputting an electric signal 120.
  • the audio unit 12 performs an operation of outputting an electric signal 120 for outputting sound by amplifying a signal corresponding to the sound and adjusting the sound quality.
  • the audio unit 12 operates by a voltage 110 supplied from the external power supply 2 and whose noise is removed by the power supply noise filter 11.
  • the audio unit 12 outputs an electric signal 120 for outputting sound.
  • the electric signal 120 is a signal corresponding to sound.
  • the audio unit 12 includes, for example, a DSP (Digital Signal Processor), a power amplifier, and the like.
  • the voltage detection unit 13 detects the voltage supplied from the external power supply 2.
  • the voltage detection unit 13 is, for example, a power supply IC (Integrated Circuit).
  • the reset signal generation unit 14 outputs a reset signal when the voltage value of the external power supply 2 detected by the voltage detection unit 13 is out of the operating voltage. More specifically, the reset signal generation unit 14 outputs a reset signal when the voltage value of the external power supply 2 is lower than the constant voltage value output from the constant voltage generation unit 16. Therefore, the reset signal generation unit 14 outputs a reset signal when the voltage value of the external power supply 2 is lower than a predetermined first threshold value based on the constant voltage value output from the constant voltage generation unit 16.
  • the reset signal generation unit 14 includes, for example, a reset IC, a comparator, and the like.
  • the system control unit 15 controls each unit in the device.
  • the system control unit 15 is, for example, a microcomputer or an SOC (System On a Chip).
  • the system control unit 15 operates by a constant voltage (constant voltage) output by the constant voltage generation unit 16.
  • the system control unit 15 resets the in-vehicle device 1, that is, its own device, by the reset signal output by the reset signal generation unit 14.
  • the reset operation is to return the operating state of the device to the initial state.
  • the reset signal generation unit 14 and the system control unit 15 function as a reset unit that performs a reset operation of the own device.
  • the constant voltage generation unit 16 takes the voltage supplied from the external power supply 2 as an input and outputs a constant value voltage, that is, a constant voltage.
  • the constant voltage output by the constant voltage generation unit 16 serves as a power source for the system control unit 15. Further, the constant voltage output by the constant voltage generation unit 16 is input to the reset signal generation unit 14.
  • the voltage drop monitoring unit 17 inputs the voltage 110 from which noise has been removed by the power supply noise filter 11.
  • the voltage drop monitoring unit 17 functions as a voltage monitoring unit that monitors the input voltage value.
  • the voltage drop monitoring unit 17 outputs a notification signal 170 for operating the volume adjustment signal generation unit 18 as a trigger signal when the input voltage value drops below a predetermined second threshold value.
  • the second threshold value is a voltage value higher than the first threshold value.
  • the volume adjustment signal generation unit 18 outputs the volume adjustment signal 180 when the voltage drop monitoring unit 17 outputs the notification signal 170.
  • the volume adjustment signal 180 output by the volume adjustment signal generation unit 18 is input to the audio unit 12.
  • the volume adjustment signal generation unit 18 functions as an adjustment unit that suppresses the current consumption of the audio unit 12.
  • the audio unit 12 reduces the voltage value of the electric signal for outputting the sound when the volume adjustment signal 180 is input. Therefore, when the volume adjustment signal 180 is input, the current consumption by the audio unit 12 is suppressed, so that the reset signal output from the reset signal generation unit 14 can be suppressed, and the reset operation of the in-vehicle device 1 is suppressed. To.
  • FIG. 2 is a diagram showing a detailed configuration example of the vehicle-mounted device 1 according to the first embodiment.
  • FIG. 2 mainly shows a configuration example of the voltage drop monitoring unit 17 and the volume adjustment signal generation unit 18 of the in-vehicle device 1.
  • the voltage drop monitoring unit 17 includes an operational amplifier (Operational Amplifier) 171, a constant voltage source 172, and resistors 173, 174, 175, 176 and 177.
  • a predetermined constant voltage by the constant voltage source 172 is input to the non-inverting input terminal (+) of the operational amplifier 171 via the resistor 173.
  • the output terminal of the power supply noise filter 11 is connected to the inverting input terminal (-) of the operational amplifier 171 via a resistor 174.
  • One end of the resistor 175 is connected between the resistor 174 and the inverting input terminal ( ⁇ ) of the operational amplifier 171, and the other end of the resistor 175 is grounded.
  • the voltage value divided by the resistor 174 and the resistor 175 is input to the inverting input terminal ( ⁇ ) of the operational amplifier 171.
  • the output terminal Vout of the operational amplifier 171 is connected to one end of the resistor 176 and one end of the resistor 177.
  • the other end of the resistor 176 is connected to the constant voltage source 172, and the other end of the resistor 177 is grounded.
  • the resistors 176 and 177 generate a bias voltage for the transistor 184 of the volume control signal generator 18.
  • the bias voltage is set so that the transistor 184 is turned off when the voltage of the output terminal Vout is low level, and the transistor 184 is turned on when the voltage of the output terminal Vout is high level.
  • the operational amplifier 171 operates as a comparator (that is, a comparison circuit).
  • the operational amplifier 171 compares the voltage of the constant voltage source 172 with the voltage 110.
  • the voltage of the output terminal Vout of the operational amplifier 171 is at a low level.
  • the operational amplifier 171 uses the voltage of the constant voltage source 172 as a threshold value, and when the voltage 110 falls below the threshold value, the voltage of the output terminal Vout is set to a high level.
  • the high-level voltage value of the output terminal Vout is input to the volume adjustment signal generation unit 18 as a notification signal 170.
  • the operational amplifier 171 uses a voltage 110 from which noise has been removed by the power supply noise filter 11 as a power source.
  • the operational amplifier 171 may use a voltage other than the voltage 110 as a power source.
  • the volume adjustment signal generation unit 18 outputs a signal for suppressing the current consumption of the audio unit 12 based on the comparison result of the comparator of the voltage drop monitoring unit 17.
  • the volume adjustment signal generation unit 18 includes a pull-up power supply circuit 181, resistors 182 and 183, a transistor 184, and a capacitor 185.
  • the pull-up power supply circuit 181 receives a voltage 110 as an input and functions as a pull-up power supply.
  • One end of the resistor 182 is connected to the pull-up power supply circuit 181 and the other end is connected to one end of the resistor 183.
  • the other end of the resistor 183 is connected to the collector of the transistor 184.
  • the base of the transistor 184 is connected to the output terminal Vout of the operational amplifier 171.
  • the emitter of transistor 184 is grounded. If the voltage of the output terminal Vout is low level, the transistor 184 is turned off. If the voltage of the output terminal Vout is high, the transistor 184 is turned on.
  • the voltage value divided by the resistor 182 and the resistor 183 is input to the audio unit 12.
  • the transistor 184 When the transistor 184 is in the off state, the voltage value input to the audio unit 12 is at a high level.
  • the transistor 184 When the transistor 184 is in the ON state, the voltage value input to the audio unit 12 is low level. This low-level voltage value is input to the audio unit 12 as a volume adjustment signal 180.
  • the capacitor 185 functions as a bypass capacitor.
  • the audio unit 12 includes an attenuator (that is, an attenuator) 121.
  • the attenuator 121 can control the amount of attenuation based on the volume adjustment signal 180, and adjusts the volume. For example, the attenuator 121 is controlled to reduce the volume when the volume adjustment signal 180 is input. Therefore, when the volume adjustment signal 180 is input, the sound output, that is, the voltage value of the electric signal 120 is lowered, and the current consumption by the audio unit 12 is suppressed.
  • the output voltage of the external power supply 2 is input to the voltage drop monitoring unit 17 as the voltage 110 from which noise has been removed by the power supply noise filter 11.
  • the voltage drop monitoring unit 17 monitors whether or not the input voltage to the inverting input terminal ( ⁇ ) of the operational amplifier 171 is lower than the threshold value due to the voltage of the constant voltage source 172.
  • the output voltage of the external power supply 2 does not fluctuate, or even if there is a fluctuation but not lower than the threshold value due to the voltage of the constant voltage source 172, the voltage of the output terminal Vout of the comparator by the operational amplifier 171 becomes low level. Become. Therefore, the notification signal 170 is not output, and the transistor 184 is in the off state. When the transistor 184 is in the off state, the volume adjustment signal 180 is not input to the audio unit 12.
  • the voltage of the output terminal Vout of the comparator by the operational amplifier 171 becomes a high level.
  • the high level of the voltage of the output terminal Vout is input to the volume adjustment signal generation unit 18 as a notification signal 170.
  • the transistor 184 of the volume adjustment signal generation unit 18 is turned on.
  • the transistor 184 is in the ON state, a low-level voltage value is input to the audio unit 12 as a volume adjustment signal 180.
  • the voltage drop monitoring unit 17 monitors the drop in the output voltage of the external power supply 2.
  • the causes of the drop in the power supply voltage are, for example, starting the engine of the vehicle, starting the engine from the idling stop, lighting the light of the vehicle, lighting the brake lamp of the vehicle, and the like. That is, the output voltage of the external power supply 2 fluctuates when the operating states such as engine start, idling stop, and start change.
  • the fluctuation of the output voltage of the external power supply 2 is transmitted to the voltage drop monitoring unit 17 after passing through the power supply noise filter 11 of the in-vehicle device 1 via the transmission line.
  • the voltage drop monitoring unit 17 outputs a notification signal 170 indicating that a voltage drop has occurred.
  • the notification signal 170 is input to the volume adjustment signal generation unit 18.
  • the volume adjustment signal generation unit 18 outputs the volume adjustment signal 180 based on the notification signal 170.
  • the volume can be adjusted in real time in the audio unit 12.
  • the current consumption of the audio unit 12 is reduced.
  • the volume adjustment signal 180 is not input to the attenuator 121 of the audio unit 12, and the attenuator 121 returns the volume to the original state.
  • the voltage drop monitoring unit 17 and the volume adjustment signal generation unit 18 in FIG. 2 reduce the current consumption of the audio unit 12 by the operation of the electric circuit. Since the voltage drop monitoring unit 17 and the volume adjustment signal generation unit 18 do not operate based on software processing, the current consumption of the audio unit 12 can be quickly reduced. By reducing the current consumption of the audio unit 12, the reset operation of the in-vehicle device 1 can be suppressed.
  • FIG. 3 is a flowchart showing the operation of the in-vehicle device 1 according to the first embodiment.
  • step S1 the voltage drop monitoring unit 17 monitors the drop in the output voltage of the external power supply 2.
  • step S2 the voltage drop monitoring unit 17 determines whether or not the monitored voltage is equal to or less than a predetermined threshold value.
  • step S2 If it is determined in step S2 that the monitored voltage is equal to or less than a predetermined threshold value (Yes in step S2), the process proceeds to step S3.
  • step S3 the voltage drop monitoring unit 17 outputs a notification signal 170 indicating that a voltage drop has occurred.
  • the notification signal 170 is input to the volume adjustment signal generation unit 18.
  • step S4 the volume adjustment signal generation unit 18 outputs the volume adjustment signal 180 based on the notification signal 170.
  • the audio unit 12 adjusts the volume in real time and reduces the volume.
  • step S6 the current consumption of the audio unit 12 is reduced. Further, in step S7, it is determined whether or not the voltage drop has been eliminated.
  • step S7 If it is determined in step S7 that the voltage drop has not been eliminated (No in step S7), the process returns to step S3, and the voltage drop monitoring unit 17 outputs a notification signal 170 indicating that the voltage drop has occurred. After that, the operation is continuously performed in the same manner as described above.
  • step S7 determines whether the voltage drop has been eliminated (Yes in step S7). If it is determined in step S7 that the voltage drop has been eliminated (Yes in step S7), the process returns to step S1 and the monitoring by the voltage drop monitoring unit 17 is continued.
  • step S2 If it is determined in step S2 that the threshold value is not equal to or lower than the predetermined threshold value (that is, the threshold value is exceeded) (No in step S2), the process returns to step S1 and monitoring by the voltage drop monitoring unit 17 is continued.
  • the current consumption of the audio unit 12 can be reduced.
  • the reset operation of the in-vehicle device 1 can be suppressed.
  • the operation of the in-vehicle device 1 can be continued without giving a sense of discomfort to the user.
  • FIG. 4 is a diagram showing a configuration example of an in-vehicle device according to the second embodiment of the present disclosure.
  • the in-vehicle device 1a according to the second embodiment is different from the in-vehicle device 1 according to the first embodiment by comparing the voltage value of the electric signal 120 output from the audio unit 12 with the reference voltage value and comparing the electric signal 120 with the reference voltage value.
  • the voltage drop monitoring unit 17a is provided with a comparison circuit 19 that outputs a start trigger signal 190 when the voltage value of the above exceeds the reference voltage value, and operates when the comparison circuit 19 outputs the start trigger signal as a high level. Is a point to be provided. It can be said that the start trigger signal 190 is output when the start trigger signal 190 is at a high level, and that the start trigger signal 190 is not output when the start trigger signal 190 is at a low level. it can.
  • FIG. 5 is a diagram showing a detailed configuration example of the vehicle-mounted device 1a according to the second embodiment.
  • the in-vehicle device 1a according to the second embodiment is different from the in-vehicle device 1 according to the first embodiment in that the comparison circuit 19 is provided and the voltage drop monitoring unit 17a is provided with the switch 178.
  • the comparison circuit 19 has a comparator 191.
  • the comparator 191 inputs an electric signal 120 and compares the voltage value with the reference voltage value Vref.
  • the comparator 191 outputs the start trigger signal 190 as a high level, for example, when the voltage value of the electric signal 120 output by the audio unit 12 is equal to or higher than the reference voltage value Vref.
  • the switch 178 is turned on and the voltage drop monitoring unit 17a operates.
  • the comparator 191 outputs the start trigger signal 190 as a low level when the voltage value of the electric signal 120 is less than the reference voltage value Vref.
  • the switch 178 is turned off.
  • the switch 178 for example, a relay switch or an analog switch is used. Therefore, during the period when the voltage value of the electric signal 120 is less than the reference voltage value Vref, the voltage drop monitoring unit 17a does not operate, and the power consumption can be reduced as compared with the case where the voltage drop monitoring unit 17a always operates. ..
  • FIG. 6 is a flowchart showing the operation of the in-vehicle device 1a according to the second embodiment.
  • the flowchart of FIG. 6 has steps T0 and T1 unlike the flowchart of FIG.
  • step T0 it is determined whether or not the voltage value of the electric signal 120 output from the audio unit 12 is equal to or higher than the reference voltage value Vref.
  • step T0 when the voltage value of the electric signal 120 is equal to or higher than the reference voltage value Vref (Yes in step T0), the process proceeds to step T1.
  • step T1 it is determined whether or not the start trigger signal 190 output from the comparator 191 is input. If the activation trigger signal 190 is input in step T1 (Yes in step T1), the process proceeds to step S1.
  • the operation after step S1 is the same as the operation described with reference to FIG.
  • step T0 if the voltage value of the electric signal 120 is not equal to or higher than the reference voltage value Vref, that is, if it is less than the reference voltage value Vref (No in step T0), the process does not proceed to step T1 and returns to step T0. If the activation trigger signal 190 is not input in step T1 (No in step T1), the process does not proceed to step S1 and returns to step T1. Therefore, the voltage drop monitoring unit 17a operates when the voltage value of the electric signal 120 is equal to or higher than the reference voltage value Vref, and the voltage drop monitoring unit 17a operates when the voltage value of the electric signal 120 is less than the reference voltage value Vref. Do not work.
  • the current consumption of the audio unit 12 can be reduced.
  • the reset operation of the in-vehicle device 1a can be suppressed.
  • the operation of the in-vehicle device 1a can be continued without giving a sense of discomfort to the user. Since the volume is reduced for a short time, the user does not feel uncomfortable. In particular, the sound generated when the engine is started masks the state in which the volume is reduced, so that the user does not feel uncomfortable. Further, since the voltage drop monitoring unit 17a operates only when the electric signal 120 is input from the audio unit 12, the power consumption can be reduced as compared with the case where the voltage drop monitoring unit 17a always operates.
  • FIG. 7 is a diagram showing a configuration example of an in-vehicle device according to the third embodiment of the present disclosure.
  • the in-vehicle device 1b according to the third embodiment is different from the in-vehicle device 1 according to the first embodiment in that it further includes a vibration detection sensor 4, and operates using the detection signal 41 of the vibration detection sensor 4 as an activation trigger signal.
  • the voltage drop monitoring unit 17b is provided.
  • Other configurations and operations are the same as in the case of the first embodiment. It can be said that the detection signal 41 is input when the detection signal 41 is at a high level, and it can be said that the detection signal 41 is not input when the detection signal 41 is at a low level.
  • FIG. 8 is a diagram showing a detailed configuration example of the vehicle-mounted device 1b according to the third embodiment.
  • the in-vehicle device 1b according to the third embodiment is different from the in-vehicle device 1 according to the first embodiment in that the voltage drop monitoring unit 17b is provided with the switch 178. Only during the period when the detection signal 41 of the vibration detection sensor 4 is input to the voltage drop monitoring unit 17b, the switch 178 is turned on and the voltage drop monitoring unit 17b operates.
  • the switch 178 for example, a relay switch or an analog switch is used.
  • FIG. 9 is a flowchart showing the operation of the in-vehicle device 1b according to the third embodiment.
  • the flowchart of FIG. 9 has step T2 unlike the flowchart of FIG. In step T2, it is determined from the vibration detection sensor 4 whether or not the detection signal 41, which is the activation trigger signal, is input. If the detection signal 41 is input in step T2 (Yes in step T2), the process proceeds to step S1.
  • the operation after step S1 is the same as the operation described with reference to FIG.
  • step T2 If the detection signal 41 is not input in step T2 (No in step T2), the process does not proceed to step S1 and returns to step T2.
  • the detection signal 41 is input, the voltage drop monitoring unit 17b operates, and when the detection signal 41 is not input, the voltage drop monitoring unit 17b does not operate. Therefore, during the period when the detection signal 41 of the vibration detection sensor 4 is not input, the voltage drop monitoring unit 17b does not operate, and the power consumption can be reduced as compared with the case where the voltage drop monitoring unit 17b always operates. ..
  • the vibration detection sensor 4 is provided in the vehicle and detects the vibration of the vehicle.
  • the vibration detection sensor 4 outputs a detection signal 41, for example, during a period during which the vibration of the vehicle is being detected.
  • the vibration detection sensor 4 may detect vibration due to a specific movement of the vehicle and output a detection signal 41. For example, when the vehicle is stopped and the vehicle is in the idling stop state, the vibration detection sensor 4 may detect the vibration when the vehicle is stopped and output the detection signal 41. In that case, the vibration due to the engine start may be further detected, and the output of the detection signal 41 may be released when the engine is started and the idling stop state is stopped.
  • the vibration detection sensor 4 may output the detection signal 41 for a predetermined time after detecting the vibration due to the specific movement of the vehicle.
  • a timer circuit is provided, and after detecting vibration due to a specific movement of the vehicle, the detection signal 41 is output only within a predetermined time measured by the timer circuit, and the detection signal 41 is not output after the lapse of a predetermined time. You may.
  • the voltage drop monitoring unit 17b operates within the time when the detection signal 41 which is the start trigger signal is input, and at a time other than the time when the detection signal 41 which is the start trigger signal is input. Since it does not operate, power consumption can be suppressed.
  • the current consumption of the audio unit 12 can be reduced.
  • the reset operation of the in-vehicle device 1b can be suppressed.
  • the operation of the in-vehicle device 1b can be continued without giving a sense of discomfort to the user. Since the volume is reduced for a short time, the user does not feel uncomfortable. In particular, the sound generated when the engine is started masks the state in which the volume is reduced, so that the user does not feel uncomfortable. Further, since the voltage drop monitoring unit 17b operates only when the detection signal 41 is input from the vibration detection sensor 4, the power consumption can be reduced as compared with the case where the voltage drop monitoring unit 17b always operates. ..
  • the sensor provided on the drive recorder can be used as the vibration detection sensor 4.
  • the detection signal 41 may be output at that timing. Further, since the timing at which the vehicle stops can be detected from the image acquired by the camera provided in the drive recorder, the detection signal 41 may be output at that timing. If the sensor provided in the drive recorder is used as the vibration detection sensor 4 or the detection signal 41 is output by using the camera provided in the drive recorder, there is no need to newly install a sensor, and the product It is possible to suppress the increase in cost.
  • the present disclosure is applied not only to the audio unit 12 but also to the operating unit that performs a predetermined operation by the supply voltage supplied from the battery.
  • the present disclosure applies to a car navigation device that performs a route guidance process for a driver, a monitor device that performs an image display operation on an in-vehicle monitor, an air purifier device that performs an air purifying process, and the like.
  • the above has explained the in-vehicle device mounted on the vehicle.
  • the present disclosure applies not only to devices mounted on vehicles, but also to devices that operate on a supply voltage supplied by a battery.
  • This disclosure can be used, for example, in a car navigation device and an in-vehicle sound device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Abstract

The present invention provides a vehicle-mounted device configured so as not to cause a user discomfort. A vehicle-mounted device (1) includes: an audio unit (12) that performs a predetermined operation by a supply voltage supplied from an external power supply (2) that is a battery provided on the vehicle; a reset signal generation unit (14) and a system control unit (15) that function as a reset unit that performs a reset operation of the host device; a voltage drop monitoring unit (17) that detects a drop of the supply voltage below a second threshold higher than a first threshold; and an adjustment unit that suppresses current consumption of the audio unit (12) when the drop of the supply voltage below the second threshold is being detected by the voltage drop monitoring unit (17). When a volume adjustment signal (180) is being input, the current consumption of the audio unit (12) is suppressed, output of a reset signal from the reset signal generation unit (14) can be inhibited, and reset operations of the vehicle-mounted device (1) is inhibited.

Description

車載装置In-vehicle device
　本開示は、車載装置に関する。 This disclosure relates to an in-vehicle device.
　車載装置は、車両に設けられたバッテリを電源とし、バッテリから供給される電力によって動作することがある。車載装置によっては、バッテリによる電源電圧が変動した際に、車載装置がリセットされることがある。例えば、消費電流が多く、電圧降下によって車載装置の動作電圧を下回った場合に、車載装置がリセットされることがある。車載装置がリセットされることにより、音の出力が停止したり、ショックノイズが発生したり、表示画面が黒画になったりする現象が生じることがある。これらの現象は、車載装置のユーザに違和感を与えることがあり、好ましくない。 The in-vehicle device uses the battery provided in the vehicle as a power source, and may operate by the electric power supplied from the battery. Depending on the in-vehicle device, the in-vehicle device may be reset when the power supply voltage due to the battery fluctuates. For example, when the current consumption is large and the voltage drops below the operating voltage of the in-vehicle device, the in-vehicle device may be reset. When the in-vehicle device is reset, the sound output may be stopped, shock noise may be generated, or the display screen may become a black image. These phenomena may give a sense of discomfort to the user of the in-vehicle device, which is not preferable.
　また、特許文献１には、バッテリを電源とするシステムが開示されている。特許文献１に開示されているシステムでは、負荷電流が閾値を超過する場合、シャットダウン信号を電源回路に送って電源を停止させる。 Further, Patent Document 1 discloses a system using a battery as a power source. In the system disclosed in Patent Document 1, when the load current exceeds the threshold value, a shutdown signal is sent to the power supply circuit to stop the power supply.
特許第４１７８２４７号公報Japanese Patent No. 4178247
　ユーザが使用している最中に装置をリセットしたり、装置の電源を停止させたりすると、ユーザに違和感を与えることがあり、好ましくない。したがって、ユーザに違和感を与えないようにした車載装置を実現することが望ましい。 It is not preferable to reset the device or stop the power supply of the device while the user is using it, as it may give the user a sense of discomfort. Therefore, it is desirable to realize an in-vehicle device that does not give a sense of discomfort to the user.
　本実施形態は、上記に鑑みてなされたものであり、その目的は、ユーザに違和感を与えないようにした車載装置を提供することである。 The present embodiment has been made in view of the above, and an object thereof is to provide an in-vehicle device that does not give a sense of discomfort to the user.
　上述した課題を解決し、目的を達成するために、本実施形態による車載装置は、車両に設けられた外部電源から供給される供給電圧によって所定の動作を行う動作部と、前記供給電圧が所定の第１閾値より低下した場合に、自装置のリセット動作を行うリセット部と、前記供給電圧が、所定の第１閾値より高い所定の第２閾値より低下したことを検出する電圧監視部と、前記電圧監視部が、前記供給電圧が前記第２閾値より低下していることを検出しているとき、前記動作部の消費電流を抑える調整部と、を含む。 In order to solve the above-mentioned problems and achieve the object, the in-vehicle device according to the present embodiment has an operating unit that performs a predetermined operation by a supply voltage supplied from an external power supply provided in the vehicle, and a predetermined supply voltage. A reset unit that resets the own device when the voltage drops below the first threshold value, and a voltage monitoring unit that detects that the supply voltage has dropped below a predetermined second threshold value higher than the predetermined first threshold value. When the voltage monitoring unit detects that the supply voltage is lower than the second threshold value, the voltage monitoring unit includes an adjusting unit that suppresses the current consumption of the operating unit.
　本実施形態によれば、ユーザに違和感を与えないようにした車載装置を実現できる。 According to this embodiment, it is possible to realize an in-vehicle device that does not give a sense of discomfort to the user.
図１は、本開示の第１実施形態による車載装置の構成例を示す図である。FIG. 1 is a diagram showing a configuration example of an in-vehicle device according to the first embodiment of the present disclosure. 図２は、第１実施形態による車載装置の詳細な構成例を示す図である。FIG. 2 is a diagram showing a detailed configuration example of the in-vehicle device according to the first embodiment. 図３は、第１実施形態による車載装置の動作を示すフローチャートである。FIG. 3 is a flowchart showing the operation of the in-vehicle device according to the first embodiment. 図４は、本開示の第２実施形態による車載装置の構成例を示す図である。FIG. 4 is a diagram showing a configuration example of an in-vehicle device according to the second embodiment of the present disclosure. 図５は、第２実施形態による車載装置の詳細な構成例を示す図である。FIG. 5 is a diagram showing a detailed configuration example of the vehicle-mounted device according to the second embodiment. 図６は、第２実施形態による車載装置の動作を示すフローチャートである。FIG. 6 is a flowchart showing the operation of the in-vehicle device according to the second embodiment. 図７は、本開示の第３実施形態による車載装置の構成例を示す図である。FIG. 7 is a diagram showing a configuration example of an in-vehicle device according to the third embodiment of the present disclosure. 図８は、第３実施形態による車載装置の詳細な構成例を示す図である。FIG. 8 is a diagram showing a detailed configuration example of the vehicle-mounted device according to the third embodiment. 図９は、第３実施形態による車載装置の動作を示すフローチャートである。FIG. 9 is a flowchart showing the operation of the in-vehicle device according to the third embodiment.
　以下に、本実施形態を図面に基づいて詳細に説明する。以下の各実施形態の説明において、他の実施形態と同一又は同等の構成部分については同一の符号を付し、その説明を簡略又は省略する。各実施形態により本開示が限定されるものではない。また、各実施形態の構成要素には、当業者が置換可能かつ容易なもの、あるいは実質的に同一のものが含まれる。また、以下に記載した構成は適宜組み合わせることが可能である。本開示の要旨を逸脱しない範囲で構成の省略、置換又は変更を行うことができる。 The present embodiment will be described in detail below based on the drawings. In the following description of each embodiment, the same or equivalent components as those of the other embodiments are designated by the same reference numerals, and the description thereof will be simplified or omitted. The present disclosure is not limited to each embodiment. In addition, the components of each embodiment include those that can be easily replaced by those skilled in the art, or those that are substantially the same. In addition, the configurations described below can be combined as appropriate. The configuration may be omitted, replaced or changed without departing from the gist of the present disclosure.
　［第１実施形態］
　図１は、本開示の第１実施形態による車載装置の構成例を示す図である。図１において、車載装置１は、外部電源２から供給される電圧、すなわち供給電圧によって動作する。車載装置１は、例えば、カーナビゲーション装置、音を出力するカーステレオ（すなわち、車載音響装置）、である。 [First Embodiment]
FIG. 1 is a diagram showing a configuration example of an in-vehicle device according to the first embodiment of the present disclosure. In FIG. 1, the in-vehicle device 1 operates by a voltage supplied from an external power source 2, that is, a supply voltage. The in-vehicle device 1 is, for example, a car navigation device or a car stereo that outputs sound (that is, an in-vehicle sound device).
　外部電源２は、車載装置１に電圧を供給する。外部電源２は、例えば、直流電圧を供給するバッテリである。外部電源２は、車載装置１と同じ車両に設けられる。 The external power supply 2 supplies a voltage to the in-vehicle device 1. The external power supply 2 is, for example, a battery that supplies a DC voltage. The external power supply 2 is provided in the same vehicle as the in-vehicle device 1.
　スピーカ３は、車載装置１から出力される電気信号を入力とする。スピーカ３は、電気信号を音に変換する。スピーカ３は、車両に搭載されているスピーカである。 The speaker 3 receives an electric signal output from the in-vehicle device 1 as an input. The speaker 3 converts an electric signal into sound. The speaker 3 is a speaker mounted on the vehicle.
　［車載装置の構成］
　車載装置１は、電源ノイズフィルタ１１と、オーディオ部１２と、電圧検出部１３と、リセット信号発生部１４と、システム制御部１５と、定電圧発生部１６と、電圧降下監視部１７と、音量調整信号発生部１８と、を有する。 [Configuration of in-vehicle device]
The in-vehicle device 1 includes a power supply noise filter 11, an audio unit 12, a voltage detection unit 13, a reset signal generation unit 14, a system control unit 15, a constant voltage generation unit 16, a voltage drop monitoring unit 17, and a volume. It has an adjustment signal generation unit 18.
　電源ノイズフィルタ１１は、外部電源２から供給される電源電圧のノイズを除去する。電源ノイズフィルタ１１は、例えば、インダクタ、キャパシタによって構成される。 The power supply noise filter 11 removes noise from the power supply voltage supplied from the external power supply 2. The power supply noise filter 11 is composed of, for example, an inductor and a capacitor.
　オーディオ部１２は、外部電源２から供給される供給電圧によって所定の動作を行う動作部である。所定の動作とは、電気信号１２０を出力する動作である。具体的には、オーディオ部１２は、音に対応する信号を増幅したり、音質を調整したりすることにより、音を出力するための電気信号１２０を出力する動作を行う。オーディオ部１２は、外部電源２から供給され、電源ノイズフィルタ１１によってノイズが除去された電圧１１０によって動作する。オーディオ部１２は、音を出力するための電気信号１２０を出力する。電気信号１２０は、音に対応する信号である。オーディオ部１２は、例えば、ＤＳＰ（Digital　Signal　Processor）、パワーアンプなどを備える。 The audio unit 12 is an operating unit that performs a predetermined operation by the supply voltage supplied from the external power supply 2. The predetermined operation is an operation of outputting an electric signal 120. Specifically, the audio unit 12 performs an operation of outputting an electric signal 120 for outputting sound by amplifying a signal corresponding to the sound and adjusting the sound quality. The audio unit 12 operates by a voltage 110 supplied from the external power supply 2 and whose noise is removed by the power supply noise filter 11. The audio unit 12 outputs an electric signal 120 for outputting sound. The electric signal 120 is a signal corresponding to sound. The audio unit 12 includes, for example, a DSP (Digital Signal Processor), a power amplifier, and the like.
　電圧検出部１３は、外部電源２から供給される電圧を検出する。電圧検出部１３は、例えば電源ＩＣ（Integrated　Circuit）である。 The voltage detection unit 13 detects the voltage supplied from the external power supply 2. The voltage detection unit 13 is, for example, a power supply IC (Integrated Circuit).
　リセット信号発生部１４は、電圧検出部１３によって検出される外部電源２の電圧値が、動作電圧外になった場合にリセット信号を出力する。より具体的には、リセット信号発生部１４は、外部電源２の電圧値が、定電圧発生部１６から出力される定電圧値より低下した場合にリセット信号を出力する。したがって、リセット信号発生部１４は、外部電源２の電圧値が、定電圧発生部１６から出力される定電圧値による所定の第１閾値より低下した場合に、リセット信号を出力する。リセット信号発生部１４は、例えば、リセットＩＣ、コンパレータ等を備える。 The reset signal generation unit 14 outputs a reset signal when the voltage value of the external power supply 2 detected by the voltage detection unit 13 is out of the operating voltage. More specifically, the reset signal generation unit 14 outputs a reset signal when the voltage value of the external power supply 2 is lower than the constant voltage value output from the constant voltage generation unit 16. Therefore, the reset signal generation unit 14 outputs a reset signal when the voltage value of the external power supply 2 is lower than a predetermined first threshold value based on the constant voltage value output from the constant voltage generation unit 16. The reset signal generation unit 14 includes, for example, a reset IC, a comparator, and the like.
　システム制御部１５は、装置内の各部を制御する。システム制御部１５は、例えば、マイコン、ＳＯＣ（System　On　a　Chip）である。システム制御部１５は定電圧発生部１６が出力する一定値の電圧（定電圧）によって動作する。システム制御部１５は、リセット信号発生部１４が出力するリセット信号によって、車載装置１すなわち自装置のリセット動作を行う。リセット動作とは、装置の動作状態を初期状態に戻すことをいう。リセット信号発生部１４およびシステム制御部１５は、自装置のリセット動作を行うリセット部として機能する。 The system control unit 15 controls each unit in the device. The system control unit 15 is, for example, a microcomputer or an SOC (System On a Chip). The system control unit 15 operates by a constant voltage (constant voltage) output by the constant voltage generation unit 16. The system control unit 15 resets the in-vehicle device 1, that is, its own device, by the reset signal output by the reset signal generation unit 14. The reset operation is to return the operating state of the device to the initial state. The reset signal generation unit 14 and the system control unit 15 function as a reset unit that performs a reset operation of the own device.
　定電圧発生部１６は、外部電源２から供給される電圧を入力とし、一定値の電圧すなわち定電圧を出力する。定電圧発生部１６が出力する定電圧は、システム制御部１５の電源になる。また、定電圧発生部１６が出力する定電圧は、リセット信号発生部１４に入力される。 The constant voltage generation unit 16 takes the voltage supplied from the external power supply 2 as an input and outputs a constant value voltage, that is, a constant voltage. The constant voltage output by the constant voltage generation unit 16 serves as a power source for the system control unit 15. Further, the constant voltage output by the constant voltage generation unit 16 is input to the reset signal generation unit 14.
　電圧降下監視部１７は、電源ノイズフィルタ１１によってノイズが除去された電圧１１０を入力とする。電圧降下監視部１７は、入力される電圧値を監視する電圧監視部として機能する。電圧降下監視部１７は、入力される電圧値が所定の第２閾値より低下した場合に、音量調整信号発生部１８を動作させるための通知信号１７０をトリガ信号として出力する。第２閾値は、第１閾値より高い電圧値である。 The voltage drop monitoring unit 17 inputs the voltage 110 from which noise has been removed by the power supply noise filter 11. The voltage drop monitoring unit 17 functions as a voltage monitoring unit that monitors the input voltage value. The voltage drop monitoring unit 17 outputs a notification signal 170 for operating the volume adjustment signal generation unit 18 as a trigger signal when the input voltage value drops below a predetermined second threshold value. The second threshold value is a voltage value higher than the first threshold value.
　音量調整信号発生部１８は、電圧降下監視部１７が通知信号１７０を出力した場合に、音量調整信号１８０を出力する。音量調整信号発生部１８が出力する音量調整信号１８０は、オーディオ部１２に入力される。音量調整信号発生部１８は、オーディオ部１２の消費電流を抑える調整部として機能する。 The volume adjustment signal generation unit 18 outputs the volume adjustment signal 180 when the voltage drop monitoring unit 17 outputs the notification signal 170. The volume adjustment signal 180 output by the volume adjustment signal generation unit 18 is input to the audio unit 12. The volume adjustment signal generation unit 18 functions as an adjustment unit that suppresses the current consumption of the audio unit 12.
　オーディオ部１２は、音量調整信号１８０が入力されている時、音を出力するための電気信号の電圧値を低減する。したがって、音量調整信号１８０が入力されている時、オーディオ部１２による消費電流が抑えられるため、リセット信号発生部１４からリセット信号が出力されることを抑止でき、車載装置１のリセット動作が抑止される。 The audio unit 12 reduces the voltage value of the electric signal for outputting the sound when the volume adjustment signal 180 is input. Therefore, when the volume adjustment signal 180 is input, the current consumption by the audio unit 12 is suppressed, so that the reset signal output from the reset signal generation unit 14 can be suppressed, and the reset operation of the in-vehicle device 1 is suppressed. To.
　［車載装置のより詳細な構成］
　図２は、第１実施形態による車載装置１の詳細な構成例を示す図である。図２は、主に、車載装置１の電圧降下監視部１７および音量調整信号発生部１８の構成例を示す。 [More detailed configuration of in-vehicle device]
FIG. 2 is a diagram showing a detailed configuration example of the vehicle-mounted device 1 according to the first embodiment. FIG. 2 mainly shows a configuration example of the voltage drop monitoring unit 17 and the volume adjustment signal generation unit 18 of the in-vehicle device 1.
　電圧降下監視部１７は、オペアンプ（Operational　Amplifier）１７１と、定電圧源１７２と、抵抗１７３、１７４、１７５、１７６および１７７とを備える。オペアンプ１７１の非反転入力端子（＋）には、抵抗１７３を介して、定電圧源１７２による所定の定電圧が入力される。 The voltage drop monitoring unit 17 includes an operational amplifier (Operational Amplifier) 171, a constant voltage source 172, and resistors 173, 174, 175, 176 and 177. A predetermined constant voltage by the constant voltage source 172 is input to the non-inverting input terminal (+) of the operational amplifier 171 via the resistor 173.
　オペアンプ１７１の反転入力端子（－）には、抵抗１７４を介して、電源ノイズフィルタ１１の出力端が接続される。抵抗１７４とオペアンプ１７１の反転入力端子（－）との間には抵抗１７５の一端が接続され、抵抗１７５の他端は接地されている。抵抗１７４と抵抗１７５とによって分圧された電圧値がオペアンプ１７１の反転入力端子（－）に入力される。オペアンプ１７１の出力端子Ｖｏｕｔは抵抗１７６の一端および抵抗１７７の一端に接続されている。抵抗１７６の他端は定電圧源１７２に接続され、抵抗１７７の他端は接地されている。抵抗１７６および抵抗１７７は、音量調整信号発生部１８のトランジスタ１８４に対するバイアス電圧を生成する。本例では、出力端子Ｖｏｕｔの電圧がローレベルのときにトランジスタ１８４がオフ状態になり、出力端子Ｖｏｕｔの電圧がハイレベルのときにトランジスタ１８４がオン状態になるようにバイアス電圧が設定される。 The output terminal of the power supply noise filter 11 is connected to the inverting input terminal (-) of the operational amplifier 171 via a resistor 174. One end of the resistor 175 is connected between the resistor 174 and the inverting input terminal (−) of the operational amplifier 171, and the other end of the resistor 175 is grounded. The voltage value divided by the resistor 174 and the resistor 175 is input to the inverting input terminal (−) of the operational amplifier 171. The output terminal Vout of the operational amplifier 171 is connected to one end of the resistor 176 and one end of the resistor 177. The other end of the resistor 176 is connected to the constant voltage source 172, and the other end of the resistor 177 is grounded. The resistors 176 and 177 generate a bias voltage for the transistor 184 of the volume control signal generator 18. In this example, the bias voltage is set so that the transistor 184 is turned off when the voltage of the output terminal Vout is low level, and the transistor 184 is turned on when the voltage of the output terminal Vout is high level.
　オペアンプ１７１は、コンパレータ（すなわち比較回路）として動作する。オペアンプ１７１は、定電圧源１７２の電圧と、電圧１１０とを比較する。電圧１１０が定電圧源１７２の電圧より高い場合、オペアンプ１７１の出力端子Ｖｏｕｔの電圧はローレベルである。一方、電圧１１０が低下し、定電圧源１７２の電圧より低くなると、オペアンプ１７１の出力端子Ｖｏｕｔの電圧はハイレベルになる。したがって、オペアンプ１７１は、定電圧源１７２の電圧を閾値としており、電圧１１０が閾値より低下すると、出力端子Ｖｏｕｔの電圧をハイレベルとする。出力端子Ｖｏｕｔのハイレベルの電圧値は、通知信号１７０として音量調整信号発生部１８に入力される。 The operational amplifier 171 operates as a comparator (that is, a comparison circuit). The operational amplifier 171 compares the voltage of the constant voltage source 172 with the voltage 110. When the voltage 110 is higher than the voltage of the constant voltage source 172, the voltage of the output terminal Vout of the operational amplifier 171 is at a low level. On the other hand, when the voltage 110 drops and becomes lower than the voltage of the constant voltage source 172, the voltage of the output terminal Vout of the operational amplifier 171 becomes a high level. Therefore, the operational amplifier 171 uses the voltage of the constant voltage source 172 as a threshold value, and when the voltage 110 falls below the threshold value, the voltage of the output terminal Vout is set to a high level. The high-level voltage value of the output terminal Vout is input to the volume adjustment signal generation unit 18 as a notification signal 170.
　なお、本例において、オペアンプ１７１は、電源ノイズフィルタ１１によってノイズが除去された電圧１１０を電源としている。オペアンプ１７１は、電圧１１０以外の電圧を電源としてもよい。 In this example, the operational amplifier 171 uses a voltage 110 from which noise has been removed by the power supply noise filter 11 as a power source. The operational amplifier 171 may use a voltage other than the voltage 110 as a power source.
　音量調整信号発生部１８は、電圧降下監視部１７のコンパレータの比較結果に基づいて、オーディオ部１２の消費電流を抑えるための信号を出力する。音量調整信号発生部１８は、プルアップ電源回路１８１と、抵抗１８２および１８３と、トランジスタ１８４と、キャパシタ１８５とを備える。プルアップ電源回路１８１は、電圧１１０を入力とし、プルアップ電源として機能する。抵抗１８２の一端はプルアップ電源回路１８１に接続され、他端は抵抗１８３の一端に接続される。抵抗１８３の他端はトランジスタ１８４のコレクタに接続される。トランジスタ１８４のベースはオペアンプ１７１の出力端子Ｖｏｕｔに接続される。トランジスタ１８４のエミッタは、接地される。出力端子Ｖｏｕｔの電圧がローレベルであれば、トランジスタ１８４はオフ状態になる。出力端子Ｖｏｕｔの電圧がハイレベルであれば、トランジスタ１８４はオン状態になる。 The volume adjustment signal generation unit 18 outputs a signal for suppressing the current consumption of the audio unit 12 based on the comparison result of the comparator of the voltage drop monitoring unit 17. The volume adjustment signal generation unit 18 includes a pull-up power supply circuit 181, resistors 182 and 183, a transistor 184, and a capacitor 185. The pull-up power supply circuit 181 receives a voltage 110 as an input and functions as a pull-up power supply. One end of the resistor 182 is connected to the pull-up power supply circuit 181 and the other end is connected to one end of the resistor 183. The other end of the resistor 183 is connected to the collector of the transistor 184. The base of the transistor 184 is connected to the output terminal Vout of the operational amplifier 171. The emitter of transistor 184 is grounded. If the voltage of the output terminal Vout is low level, the transistor 184 is turned off. If the voltage of the output terminal Vout is high, the transistor 184 is turned on.
　抵抗１８２と抵抗１８３とによって分圧された電圧値がオーディオ部１２へ入力される。トランジスタ１８４がオフ状態のとき、オーディオ部１２へ入力される電圧値はハイレベルである。トランジスタ１８４がオン状態のとき、オーディオ部１２へ入力される電圧値はローレベルである。このローレベルの電圧値は、音量調整信号１８０としてオーディオ部１２へ入力される。なお、キャパシタ１８５は、バイパスコンデンサとして機能する。 The voltage value divided by the resistor 182 and the resistor 183 is input to the audio unit 12. When the transistor 184 is in the off state, the voltage value input to the audio unit 12 is at a high level. When the transistor 184 is in the ON state, the voltage value input to the audio unit 12 is low level. This low-level voltage value is input to the audio unit 12 as a volume adjustment signal 180. The capacitor 185 functions as a bypass capacitor.
　オーディオ部１２は、アッテネータ（すなわち、減衰器）１２１を備えている。アッテネータ１２１は、音量調整信号１８０に基づいて減衰量が制御可能であり、音量を調整する。例えば、アッテネータ１２１は、音量調整信号１８０が入力されている時、音量を低減するように制御される。したがって、音量調整信号１８０が入力されている時、音出力すなわち電気信号１２０の電圧値を低下させ、オーディオ部１２による消費電流が抑えられる。 The audio unit 12 includes an attenuator (that is, an attenuator) 121. The attenuator 121 can control the amount of attenuation based on the volume adjustment signal 180, and adjusts the volume. For example, the attenuator 121 is controlled to reduce the volume when the volume adjustment signal 180 is input. Therefore, when the volume adjustment signal 180 is input, the sound output, that is, the voltage value of the electric signal 120 is lowered, and the current consumption by the audio unit 12 is suppressed.
　［車載装置の動作］
　以上の構成において、外部電源２の出力電圧は、電源ノイズフィルタ１１によってノイズが除去された電圧１１０として、電圧降下監視部１７に入力される。電圧降下監視部１７では、オペアンプ１７１の反転入力端子（－）への入力電圧が、定電圧源１７２の電圧による閾値より低下しているか否かが監視される。 [Operation of in-vehicle device]
In the above configuration, the output voltage of the external power supply 2 is input to the voltage drop monitoring unit 17 as the voltage 110 from which noise has been removed by the power supply noise filter 11. The voltage drop monitoring unit 17 monitors whether or not the input voltage to the inverting input terminal (−) of the operational amplifier 171 is lower than the threshold value due to the voltage of the constant voltage source 172.
　したがって、外部電源２の出力電圧に変動がないか、または、変動があっても定電圧源１７２の電圧による閾値より低下していなければ、オペアンプ１７１によるコンパレータの出力端子Ｖｏｕｔの電圧はローレベルになる。このため、通知信号１７０は出力されず、トランジスタ１８４はオフ状態である。トランジスタ１８４がオフ状態であれば、音量調整信号１８０はオーディオ部１２に入力されない。 Therefore, if the output voltage of the external power supply 2 does not fluctuate, or even if there is a fluctuation but not lower than the threshold value due to the voltage of the constant voltage source 172, the voltage of the output terminal Vout of the comparator by the operational amplifier 171 becomes low level. Become. Therefore, the notification signal 170 is not output, and the transistor 184 is in the off state. When the transistor 184 is in the off state, the volume adjustment signal 180 is not input to the audio unit 12.
　一方、外部電源２の出力電圧が定電圧源１７２の電圧による閾値より低下した場合、オペアンプ１７１によるコンパレータの出力端子Ｖｏｕｔの電圧はハイレベルになる。出力端子Ｖｏｕｔの電圧のハイレベルは、通知信号１７０として音量調整信号発生部１８に入力される。出力端子Ｖｏｕｔの電圧がハイレベルである場合、音量調整信号発生部１８のトランジスタ１８４はオン状態になる。トランジスタ１８４がオン状態であれば、ローレベルの電圧値が音量調整信号１８０としてオーディオ部１２へ入力される。 On the other hand, when the output voltage of the external power supply 2 is lower than the threshold value due to the voltage of the constant voltage source 172, the voltage of the output terminal Vout of the comparator by the operational amplifier 171 becomes a high level. The high level of the voltage of the output terminal Vout is input to the volume adjustment signal generation unit 18 as a notification signal 170. When the voltage of the output terminal Vout is high, the transistor 184 of the volume adjustment signal generation unit 18 is turned on. When the transistor 184 is in the ON state, a low-level voltage value is input to the audio unit 12 as a volume adjustment signal 180.
　電圧降下監視部１７は、外部電源２の出力電圧の降下を監視する。電源電圧の降下の原因は、例えば、車両のエンジンの始動、アイドリングストップからのエンジンの始動、車両のライトの点灯、車両のブレーキランプの点灯等である。すなわち、エンジン始動や、アイドリングストップおよびスタート等の動作状態が変わる際に外部電源２の出力電圧が変動する。外部電源２の出力電圧の変動は、伝送線路を介して車載装置１の電源ノイズフィルタ１１を通過した後、電圧降下監視部１７に伝わる。 The voltage drop monitoring unit 17 monitors the drop in the output voltage of the external power supply 2. The causes of the drop in the power supply voltage are, for example, starting the engine of the vehicle, starting the engine from the idling stop, lighting the light of the vehicle, lighting the brake lamp of the vehicle, and the like. That is, the output voltage of the external power supply 2 fluctuates when the operating states such as engine start, idling stop, and start change. The fluctuation of the output voltage of the external power supply 2 is transmitted to the voltage drop monitoring unit 17 after passing through the power supply noise filter 11 of the in-vehicle device 1 via the transmission line.
　電圧降下監視部１７は、電圧降下が発生したことを示す通知信号１７０を出力する。この通知信号１７０は音量調整信号発生部１８に入力される。音量調整信号発生部１８は、通知信号１７０を基に、音量調整信号１８０を出力する。これにより、オーディオ部１２において、音量をリアルタイムに調整できる。音量を低減する結果、オーディオ部１２の消費電流が低減する。オーディオ部１２の消費電流が低減することにより、リセット信号発生部１４からリセット信号が出力されることを抑止でき、車載装置１のリセット動作を抑止できる。音量を低減するのは短時間であるため、ユーザに違和感を与えることはない。特に、エンジン始動などの際に発生する音によって、音量が低減している状態がマスクされるので、ユーザに違和感を与えることはない。 The voltage drop monitoring unit 17 outputs a notification signal 170 indicating that a voltage drop has occurred. The notification signal 170 is input to the volume adjustment signal generation unit 18. The volume adjustment signal generation unit 18 outputs the volume adjustment signal 180 based on the notification signal 170. As a result, the volume can be adjusted in real time in the audio unit 12. As a result of reducing the volume, the current consumption of the audio unit 12 is reduced. By reducing the current consumption of the audio unit 12, it is possible to suppress the output of the reset signal from the reset signal generation unit 14, and it is possible to suppress the reset operation of the in-vehicle device 1. Since the volume is reduced for a short time, the user does not feel uncomfortable. In particular, the sound generated when the engine is started masks the state in which the volume is reduced, so that the user does not feel uncomfortable.
　その後、電圧１１０の降下が解消した場合、出力端子Ｖｏｕｔの電圧がローレベルになり、トランジスタ１８４がオフ状態になる。このため、オーディオ部１２のアッテネータ１２１に音量調整信号１８０が入力されず、アッテネータ１２１は音量を元の状態に戻す。 After that, when the drop of the voltage 110 disappears, the voltage of the output terminal Vout becomes low level and the transistor 184 is turned off. Therefore, the volume adjustment signal 180 is not input to the attenuator 121 of the audio unit 12, and the attenuator 121 returns the volume to the original state.
　図２の電圧降下監視部１７および音量調整信号発生部１８は、電気回路の動作によって、オーディオ部１２の消費電流を低減する。電圧降下監視部１７および音量調整信号発生部１８は、ソフトウェア処理に基づいて動作するのではないため、オーディオ部１２の消費電流を速やかに低減できる。オーディオ部１２の消費電流を低減することにより、車載装置１のリセット動作を抑止できる。 The voltage drop monitoring unit 17 and the volume adjustment signal generation unit 18 in FIG. 2 reduce the current consumption of the audio unit 12 by the operation of the electric circuit. Since the voltage drop monitoring unit 17 and the volume adjustment signal generation unit 18 do not operate based on software processing, the current consumption of the audio unit 12 can be quickly reduced. By reducing the current consumption of the audio unit 12, the reset operation of the in-vehicle device 1 can be suppressed.
　車載装置１の動作について、さらに図３を参照して説明する。図３は、第１実施形態による車載装置１の動作を示すフローチャートである。 The operation of the in-vehicle device 1 will be further described with reference to FIG. FIG. 3 is a flowchart showing the operation of the in-vehicle device 1 according to the first embodiment.
　ステップＳ１において、電圧降下監視部１７は、外部電源２の出力電圧の降下を監視する。ステップＳ２において、電圧降下監視部１７は、監視している電圧が所定の閾値以下か否かを判断する。 In step S1, the voltage drop monitoring unit 17 monitors the drop in the output voltage of the external power supply 2. In step S2, the voltage drop monitoring unit 17 determines whether or not the monitored voltage is equal to or less than a predetermined threshold value.
　ステップＳ２において、監視している電圧が所定の閾値以下であると判断されると（ステップＳ２においてＹｅｓ）、ステップＳ３に進む。 If it is determined in step S2 that the monitored voltage is equal to or less than a predetermined threshold value (Yes in step S2), the process proceeds to step S3.
　ステップＳ３において、電圧降下監視部１７は、電圧降下が発生したことを示す通知信号１７０を出力する。この通知信号１７０は音量調整信号発生部１８に入力される。ステップＳ４において、音量調整信号発生部１８は、通知信号１７０を基に、音量調整信号１８０を出力する。これにより、ステップＳ５において、オーディオ部１２はリアルタイムに音量を調整し、音量を低減する。その結果、ステップＳ６において、オーディオ部１２の消費電流が低減する。さらに、ステップＳ７において、電圧降下が解消したか否かを判断する。 In step S3, the voltage drop monitoring unit 17 outputs a notification signal 170 indicating that a voltage drop has occurred. The notification signal 170 is input to the volume adjustment signal generation unit 18. In step S4, the volume adjustment signal generation unit 18 outputs the volume adjustment signal 180 based on the notification signal 170. As a result, in step S5, the audio unit 12 adjusts the volume in real time and reduces the volume. As a result, in step S6, the current consumption of the audio unit 12 is reduced. Further, in step S7, it is determined whether or not the voltage drop has been eliminated.
　ステップＳ７において、電圧降下が解消していないと判断されると（ステップＳ７においてＮｏ）、ステップＳ３に戻り、電圧降下監視部１７は、電圧降下が発生したことを示す通知信号１７０を出力する。以後、上記と同様に動作が継続して行われる。 If it is determined in step S7 that the voltage drop has not been eliminated (No in step S7), the process returns to step S3, and the voltage drop monitoring unit 17 outputs a notification signal 170 indicating that the voltage drop has occurred. After that, the operation is continuously performed in the same manner as described above.
　一方、ステップＳ７において、電圧降下が解消したと判断されると（ステップＳ７においてＹｅｓ）、ステップＳ１に戻り、電圧降下監視部１７による監視を継続する。 On the other hand, if it is determined in step S7 that the voltage drop has been eliminated (Yes in step S7), the process returns to step S1 and the monitoring by the voltage drop monitoring unit 17 is continued.
　なお、ステップＳ２において、所定の閾値以下ではない（すなわち、閾値を上回っている）と判断されると（ステップＳ２においてＮｏ）、ステップＳ１に戻り、電圧降下監視部１７による監視を継続する。 If it is determined in step S2 that the threshold value is not equal to or lower than the predetermined threshold value (that is, the threshold value is exceeded) (No in step S2), the process returns to step S1 and monitoring by the voltage drop monitoring unit 17 is continued.
　以上の動作によって、オーディオ部１２の消費電流を低減できる。オーディオ部１２の消費電流を低減することにより、車載装置１のリセット動作を抑止できる。これにより、ユーザに違和感を与えることなく、車載装置１の動作を継続することができる。 By the above operation, the current consumption of the audio unit 12 can be reduced. By reducing the current consumption of the audio unit 12, the reset operation of the in-vehicle device 1 can be suppressed. As a result, the operation of the in-vehicle device 1 can be continued without giving a sense of discomfort to the user.
　［第２実施形態］
　図４は、本開示の第２実施形態による車載装置の構成例を示す図である。図４において、第２実施形態による車載装置１ａが第１実施形態による車載装置１と異なる点は、オーディオ部１２から出力される電気信号１２０の電圧値を基準電圧値と比較し、電気信号１２０の電圧値が基準電圧値を超えた場合に起動トリガ信号１９０を出力する比較回路１９を備えるとともに、比較回路１９が起動トリガ信号をハイレベルとして出力しているときに動作する電圧降下監視部１７ａを備える点である。なお、起動トリガ信号１９０がハイレベルである場合に起動トリガ信号１９０が出力されているということができ、起動トリガ信号１９０がローレベルである場合に起動トリガ信号１９０が出力されていないということができる。 [Second Embodiment]
FIG. 4 is a diagram showing a configuration example of an in-vehicle device according to the second embodiment of the present disclosure. In FIG. 4, the in-vehicle device 1a according to the second embodiment is different from the in-vehicle device 1 according to the first embodiment by comparing the voltage value of the electric signal 120 output from the audio unit 12 with the reference voltage value and comparing the electric signal 120 with the reference voltage value. The voltage drop monitoring unit 17a is provided with a comparison circuit 19 that outputs a start trigger signal 190 when the voltage value of the above exceeds the reference voltage value, and operates when the comparison circuit 19 outputs the start trigger signal as a high level. Is a point to be provided. It can be said that the start trigger signal 190 is output when the start trigger signal 190 is at a high level, and that the start trigger signal 190 is not output when the start trigger signal 190 is at a low level. it can.
　図５は、第２実施形態による車載装置１ａの詳細な構成例を示す図である。図５において、第２実施形態による車載装置１ａが第１実施形態による車載装置１と異なる点は、比較回路１９を備えるとともに、電圧降下監視部１７ａにスイッチ１７８を備える点である。比較回路１９は、コンパレータ１９１を有している。コンパレータ１９１は、電気信号１２０を入力し、その電圧値と基準電圧値Ｖｒｅｆとを比較する。コンパレータ１９１は、例えば、オーディオ部１２が出力する電気信号１２０の電圧値が基準電圧値Ｖｒｅｆ以上である場合に、起動トリガ信号１９０をハイレベルとして出力する。ハイレベルの起動トリガ信号１９０が電圧降下監視部１７ａに入力されている期間において、スイッチ１７８がオン状態になり、電圧降下監視部１７ａが動作する。 FIG. 5 is a diagram showing a detailed configuration example of the vehicle-mounted device 1a according to the second embodiment. In FIG. 5, the in-vehicle device 1a according to the second embodiment is different from the in-vehicle device 1 according to the first embodiment in that the comparison circuit 19 is provided and the voltage drop monitoring unit 17a is provided with the switch 178. The comparison circuit 19 has a comparator 191. The comparator 191 inputs an electric signal 120 and compares the voltage value with the reference voltage value Vref. The comparator 191 outputs the start trigger signal 190 as a high level, for example, when the voltage value of the electric signal 120 output by the audio unit 12 is equal to or higher than the reference voltage value Vref. During the period in which the high-level start trigger signal 190 is input to the voltage drop monitoring unit 17a, the switch 178 is turned on and the voltage drop monitoring unit 17a operates.
　コンパレータ１９１は、電気信号１２０の電圧値が基準電圧値Ｖｒｅｆ未満である場合に、起動トリガ信号１９０をローレベルとして出力する。起動トリガ信号１９０がローレベルの期間においては、スイッチ１７８がオフ状態になる。スイッチ１７８には、例えば、リレースイッチや、アナログスイッチを用いる。したがって、電気信号１２０の電圧値が基準電圧値Ｖｒｅｆ未満の期間においては、電圧降下監視部１７ａが動作せず、電圧降下監視部１７ａが常に動作する場合に比べて消費電力を低減することができる。 The comparator 191 outputs the start trigger signal 190 as a low level when the voltage value of the electric signal 120 is less than the reference voltage value Vref. During the low level period of the activation trigger signal 190, the switch 178 is turned off. For the switch 178, for example, a relay switch or an analog switch is used. Therefore, during the period when the voltage value of the electric signal 120 is less than the reference voltage value Vref, the voltage drop monitoring unit 17a does not operate, and the power consumption can be reduced as compared with the case where the voltage drop monitoring unit 17a always operates. ..
　図６は、第２実施形態による車載装置１ａの動作を示すフローチャートである。図６のフローチャートは、図３のフローチャートと異なり、ステップＴ０およびステップＴ１を有する。ステップＴ０において、オーディオ部１２から出力されている電気信号１２０の電圧値が基準電圧値Ｖｒｅｆ以上であるか否かが判断される。ステップＴ０において、電気信号１２０の電圧値が基準電圧値Ｖｒｅｆ以上である場合（ステップＴ０においてＹｅｓ）、ステップＴ１に進む。 FIG. 6 is a flowchart showing the operation of the in-vehicle device 1a according to the second embodiment. The flowchart of FIG. 6 has steps T0 and T1 unlike the flowchart of FIG. In step T0, it is determined whether or not the voltage value of the electric signal 120 output from the audio unit 12 is equal to or higher than the reference voltage value Vref. In step T0, when the voltage value of the electric signal 120 is equal to or higher than the reference voltage value Vref (Yes in step T0), the process proceeds to step T1.
　ステップＴ１において、コンパレータ１９１から出力される起動トリガ信号１９０が入力されているか否かが判断される。ステップＴ１において、起動トリガ信号１９０が入力されている場合（ステップＴ１においてＹｅｓ）、ステップＳ１に進む。ステップＳ１以降の動作は、図３を参照して説明した動作と同様である。 In step T1, it is determined whether or not the start trigger signal 190 output from the comparator 191 is input. If the activation trigger signal 190 is input in step T1 (Yes in step T1), the process proceeds to step S1. The operation after step S1 is the same as the operation described with reference to FIG.
　なお、ステップＴ０において、電気信号１２０の電圧値が基準電圧値Ｖｒｅｆ以上でない場合、すなわち基準電圧値Ｖｒｅｆ未満である場合（ステップＴ０においてＮｏ）、ステップＴ１に進むことはなく、ステップＴ０に戻る。ステップＴ１において、起動トリガ信号１９０が入力されていない場合（ステップＴ１においてＮｏ）、ステップＳ１に進むことはなく、ステップＴ１に戻る。したがって、電気信号１２０の電圧値が基準電圧値Ｖｒｅｆ以上である場合に電圧降下監視部１７ａが動作し、電気信号１２０の電圧値が基準電圧値Ｖｒｅｆ未満である場合には電圧降下監視部１７ａは動作しない。 In step T0, if the voltage value of the electric signal 120 is not equal to or higher than the reference voltage value Vref, that is, if it is less than the reference voltage value Vref (No in step T0), the process does not proceed to step T1 and returns to step T0. If the activation trigger signal 190 is not input in step T1 (No in step T1), the process does not proceed to step S1 and returns to step T1. Therefore, the voltage drop monitoring unit 17a operates when the voltage value of the electric signal 120 is equal to or higher than the reference voltage value Vref, and the voltage drop monitoring unit 17a operates when the voltage value of the electric signal 120 is less than the reference voltage value Vref. Do not work.
　図４から図６を参照して説明した第２実施形態による車載装置によれば、オーディオ部１２の消費電流を低減できる。オーディオ部１２の消費電流を低減することにより、車載装置１ａのリセット動作を抑止できる。これにより、ユーザに違和感を与えることなく、車載装置１ａの動作を継続することができる。音量を低減するのは短時間であるため、ユーザに違和感を与えることはない。特に、エンジン始動などの際に発生する音によって、音量が低減している状態がマスクされるので、ユーザに違和感を与えることはない。また、オーディオ部１２から電気信号１２０が入力されている場合に限って電圧降下監視部１７ａが動作するため、電圧降下監視部１７ａが常に動作する場合に比べて消費電力を低減することができる。 According to the in-vehicle device according to the second embodiment described with reference to FIGS. 4 to 6, the current consumption of the audio unit 12 can be reduced. By reducing the current consumption of the audio unit 12, the reset operation of the in-vehicle device 1a can be suppressed. As a result, the operation of the in-vehicle device 1a can be continued without giving a sense of discomfort to the user. Since the volume is reduced for a short time, the user does not feel uncomfortable. In particular, the sound generated when the engine is started masks the state in which the volume is reduced, so that the user does not feel uncomfortable. Further, since the voltage drop monitoring unit 17a operates only when the electric signal 120 is input from the audio unit 12, the power consumption can be reduced as compared with the case where the voltage drop monitoring unit 17a always operates.
　［第３実施形態］
　図７は、本開示の第３実施形態による車載装置の構成例を示す図である。図７において、第３実施形態による車載装置１ｂが第１実施形態による車載装置１と異なる点は、振動検出センサ４をさらに備えており、振動検出センサ４の検出信号４１を起動トリガ信号として動作する電圧降下監視部１７ｂを備える点である。その他の構成および動作は、第１実施形態の場合と同様である。なお、検出信号４１がハイレベルである場合に検出信号４１が入力されているということができ、検出信号４１がローレベルである場合に検出信号４１が入力されていないということができる。 [Third Embodiment]
FIG. 7 is a diagram showing a configuration example of an in-vehicle device according to the third embodiment of the present disclosure. In FIG. 7, the in-vehicle device 1b according to the third embodiment is different from the in-vehicle device 1 according to the first embodiment in that it further includes a vibration detection sensor 4, and operates using the detection signal 41 of the vibration detection sensor 4 as an activation trigger signal. The point is that the voltage drop monitoring unit 17b is provided. Other configurations and operations are the same as in the case of the first embodiment. It can be said that the detection signal 41 is input when the detection signal 41 is at a high level, and it can be said that the detection signal 41 is not input when the detection signal 41 is at a low level.
　図８は、第３実施形態による車載装置１ｂの詳細な構成例を示す図である。図８において、第３実施形態による車載装置１ｂが第１実施形態による車載装置１と異なる点は、電圧降下監視部１７ｂにスイッチ１７８を備える点である。振動検出センサ４の検出信号４１が電圧降下監視部１７ｂに入力されている期間に限り、スイッチ１７８がオン状態になり、電圧降下監視部１７ｂが動作する。スイッチ１７８には、例えば、リレースイッチや、アナログスイッチを用いる。 FIG. 8 is a diagram showing a detailed configuration example of the vehicle-mounted device 1b according to the third embodiment. In FIG. 8, the in-vehicle device 1b according to the third embodiment is different from the in-vehicle device 1 according to the first embodiment in that the voltage drop monitoring unit 17b is provided with the switch 178. Only during the period when the detection signal 41 of the vibration detection sensor 4 is input to the voltage drop monitoring unit 17b, the switch 178 is turned on and the voltage drop monitoring unit 17b operates. For the switch 178, for example, a relay switch or an analog switch is used.
　図９は、第３実施形態による車載装置１ｂの動作を示すフローチャートである。図９のフローチャートは、図３のフローチャートと異なり、ステップＴ２を有する。ステップＴ２において、振動検出センサ４から、起動トリガ信号である検出信号４１が入力されているか否かが判断される。ステップＴ２において、検出信号４１が入力されている場合（ステップＴ２においてＹｅｓ）、ステップＳ１に進む。ステップＳ１以降の動作は、図３を参照して説明した動作と同様である。 FIG. 9 is a flowchart showing the operation of the in-vehicle device 1b according to the third embodiment. The flowchart of FIG. 9 has step T2 unlike the flowchart of FIG. In step T2, it is determined from the vibration detection sensor 4 whether or not the detection signal 41, which is the activation trigger signal, is input. If the detection signal 41 is input in step T2 (Yes in step T2), the process proceeds to step S1. The operation after step S1 is the same as the operation described with reference to FIG.
　ステップＴ２において、検出信号４１が入力されていない場合（ステップＴ２においてＮｏ）、ステップＳ１に進むことはなく、ステップＴ２に戻る。検出信号４１が入力されている場合には電圧降下監視部１７ｂが動作し、検出信号４１が入力されていない場合には電圧降下監視部１７ｂは動作しない。したがって、振動検出センサ４の検出信号４１が入力されていない期間においては、電圧降下監視部１７ｂが動作せず、電圧降下監視部１７ｂが常に動作する場合に比べて消費電力を低減することができる。 If the detection signal 41 is not input in step T2 (No in step T2), the process does not proceed to step S1 and returns to step T2. When the detection signal 41 is input, the voltage drop monitoring unit 17b operates, and when the detection signal 41 is not input, the voltage drop monitoring unit 17b does not operate. Therefore, during the period when the detection signal 41 of the vibration detection sensor 4 is not input, the voltage drop monitoring unit 17b does not operate, and the power consumption can be reduced as compared with the case where the voltage drop monitoring unit 17b always operates. ..
　振動検出センサ４は、車両に設けられており、車両の振動を検出する。振動検出センサ４は、例えば、車両の振動を検出している期間に検出信号４１を出力する。 The vibration detection sensor 4 is provided in the vehicle and detects the vibration of the vehicle. The vibration detection sensor 4 outputs a detection signal 41, for example, during a period during which the vibration of the vehicle is being detected.
　また、振動検出センサ４は、車両の特定の動きによる振動を検出して検出信号４１を出力するようにしてもよい。例えば、車両が停止してアイドリングストップの状態になる場合、車両が停止する際の振動を振動検出センサ４が検出し、検出信号４１を出力してもよい。その場合、さらにエンジン始動による振動を検出し、エンジンが始動してアイドリングストップの状態でなくなった場合に、検出信号４１の出力を解除してもよい。 Further, the vibration detection sensor 4 may detect vibration due to a specific movement of the vehicle and output a detection signal 41. For example, when the vehicle is stopped and the vehicle is in the idling stop state, the vibration detection sensor 4 may detect the vibration when the vehicle is stopped and output the detection signal 41. In that case, the vibration due to the engine start may be further detected, and the output of the detection signal 41 may be released when the engine is started and the idling stop state is stopped.
　振動検出センサ４は、車両の特定の動きによる振動を検出した後、所定時間だけ検出信号４１を出力するようにしてもよい。その場合、タイマ回路を設けておき、車両の特定の動きによる振動を検出した後、タイマ回路によって計測する所定時間内だけ検出信号４１を出力し、所定時間経過後に検出信号４１を出力しないようにしてもよい。このようにすれば、電圧降下監視部１７ｂは、起動トリガ信号である検出信号４１が入力されている時間内において動作し、かつ、起動トリガ信号である検出信号４１が入力されている時間以外において動作しないため、電力消費を抑えることができる。 The vibration detection sensor 4 may output the detection signal 41 for a predetermined time after detecting the vibration due to the specific movement of the vehicle. In that case, a timer circuit is provided, and after detecting vibration due to a specific movement of the vehicle, the detection signal 41 is output only within a predetermined time measured by the timer circuit, and the detection signal 41 is not output after the lapse of a predetermined time. You may. In this way, the voltage drop monitoring unit 17b operates within the time when the detection signal 41 which is the start trigger signal is input, and at a time other than the time when the detection signal 41 which is the start trigger signal is input. Since it does not operate, power consumption can be suppressed.
　図７、図８および図９を参照して説明した第３実施形態による車載装置によれば、オーディオ部１２の消費電流を低減できる。オーディオ部１２の消費電流を低減することにより、車載装置１ｂのリセット動作を抑止できる。これにより、ユーザに違和感を与えることなく、車載装置１ｂの動作を継続することができる。音量を低減するのは短時間であるため、ユーザに違和感を与えることはない。特に、エンジン始動などの際に発生する音によって、音量が低減している状態がマスクされるので、ユーザに違和感を与えることはない。また、振動検出センサ４から検出信号４１が入力されている場合に限って電圧降下監視部１７ｂが動作するため、電圧降下監視部１７ｂが常に動作する場合に比べて消費電力を低減することができる。 According to the in-vehicle device according to the third embodiment described with reference to FIGS. 7, 8 and 9, the current consumption of the audio unit 12 can be reduced. By reducing the current consumption of the audio unit 12, the reset operation of the in-vehicle device 1b can be suppressed. As a result, the operation of the in-vehicle device 1b can be continued without giving a sense of discomfort to the user. Since the volume is reduced for a short time, the user does not feel uncomfortable. In particular, the sound generated when the engine is started masks the state in which the volume is reduced, so that the user does not feel uncomfortable. Further, since the voltage drop monitoring unit 17b operates only when the detection signal 41 is input from the vibration detection sensor 4, the power consumption can be reduced as compared with the case where the voltage drop monitoring unit 17b always operates. ..
　［ドライブレコーダとの関係］
　車両にドライブレコーダが搭載されている場合、ドライブレコーダに設けられているセンサを振動検出センサ４として用いることができる。例えば、ドライブレコーダに設けられているセンサによって車両が停止するタイミングを検出できるので、そのタイミングで検出信号４１を出力するようにしてもよい。また、ドライブレコーダに設けられているカメラによって取得した画像によって車両が停止するタイミングを検出できるので、そのタイミングで検出信号４１を出力するようにしてもよい。ドライブレコーダに設けられているセンサを振動検出センサ４として用いたり、ドライブレコーダに設けられているカメラを用いて検出信号４１を出力するようにしたりすれば、センサを新たに設ける必要がなく、製品コストの上昇を抑えることができる。 [Relationship with drive recorder]
When the drive recorder is mounted on the vehicle, the sensor provided on the drive recorder can be used as the vibration detection sensor 4. For example, since the timing at which the vehicle stops can be detected by a sensor provided in the drive recorder, the detection signal 41 may be output at that timing. Further, since the timing at which the vehicle stops can be detected from the image acquired by the camera provided in the drive recorder, the detection signal 41 may be output at that timing. If the sensor provided in the drive recorder is used as the vibration detection sensor 4 or the detection signal 41 is output by using the camera provided in the drive recorder, there is no need to newly install a sensor, and the product It is possible to suppress the increase in cost.
　［その他］
　以上は、動作部がオーディオ部１２である場合について説明した。オーディオ部１２に限らず、バッテリから供給される供給電圧によって所定の動作を行う動作部について本開示が適用される。例えば、運転者に対する道案内処理の動作を行うカーナビゲーション装置、車内モニタへの画像表示の動作を行うモニタ装置、空気清浄処理の動作を行う空気清浄装置などについて本開示が適用される。 [Other]
The case where the operating unit is the audio unit 12 has been described above. The present disclosure is applied not only to the audio unit 12 but also to the operating unit that performs a predetermined operation by the supply voltage supplied from the battery. For example, the present disclosure applies to a car navigation device that performs a route guidance process for a driver, a monitor device that performs an image display operation on an in-vehicle monitor, an air purifier device that performs an air purifying process, and the like.
　以上は、車両に搭載される車載装置について説明した。車両に搭載される装置に限らず、バッテリから供給される供給電圧によって動作する装置について本開示が適用される。 The above has explained the in-vehicle device mounted on the vehicle. The present disclosure applies not only to devices mounted on vehicles, but also to devices that operate on a supply voltage supplied by a battery.
　本開示は、例えば、カーナビゲーション装置、車載音響装置に利用することができる。 This disclosure can be used, for example, in a car navigation device and an in-vehicle sound device.
１、１ａ、１ｂ　車載装置、２　外部電源、３　スピーカ、４　振動検出センサ、１１　電源ノイズフィルタ、１２　オーディオ部、１３　電圧検出部、１４　リセット信号発生部、１５　システム制御部、１６　定電圧発生部、１７、１７ａ、１７ｂ　電圧降下監視部、１８　音量調整信号発生部、１９　比較回路、１２１　アッテネータ、１７１　オペアンプ、１７２　定電圧源、１７８　スイッチ、１８１　プルアップ電源回路、１８４　トランジスタ、１９１　コンパレータ 1, 1a, 1b In-vehicle device, 2 External power supply, 3 Speaker, 4 Vibration detection sensor, 11 Power supply noise filter, 12 Audio section, 13 Voltage detection section, 14 Reset signal generator, 15 System control section, 16 Constant voltage generator , 17, 17a, 17b voltage drop monitoring unit, 18 volume adjustment signal generator, 19 comparison circuit, 121 attenuator, 171 operational amplifier, 172 constant voltage source, 178 switch, 181 pull-up power supply circuit, 184 transistor, 191 comparator

Claims (7)

  1. 　車両に設けられた外部電源から供給される供給電圧によって所定の動作を行う動作部と、
    　前記供給電圧が所定の第１閾値より低下した場合に、自装置のリセット動作を行うリセット部と、
    　前記供給電圧が、所定の第１閾値より高い所定の第２閾値より低下したことを検出する電圧監視部と、
    　前記電圧監視部が、前記供給電圧が前記第２閾値より低下していることを検出しているとき、前記動作部の消費電流を抑える調整部と、
    を含む車載装置。     An operating unit that performs a predetermined operation by a supply voltage supplied from an external power supply provided in the vehicle,
    A reset unit that resets the own device when the supply voltage drops below a predetermined first threshold value.
    A voltage monitoring unit that detects that the supply voltage has dropped below a predetermined second threshold value that is higher than a predetermined first threshold value, and
    When the voltage monitoring unit detects that the supply voltage is lower than the second threshold value, the adjusting unit that suppresses the current consumption of the operating unit and the adjusting unit
    In-vehicle equipment including.
  2. 　前記電圧監視部は、前記供給電圧を、前記第２閾値と比較する比較回路を含み、
    　前記調整部は、前記比較回路の比較結果に基づいて、前記動作部の消費電流を抑えるための信号を出力し、
    　前記動作部は、前記信号に基づいて、消費電流を抑える請求項１に記載の車載装置。     The voltage monitoring unit includes a comparison circuit that compares the supply voltage with the second threshold value.
    The adjusting unit outputs a signal for suppressing the current consumption of the operating unit based on the comparison result of the comparison circuit.
    The vehicle-mounted device according to claim 1, wherein the operating unit is a vehicle-mounted device that suppresses current consumption based on the signal.
  3. 　前記動作部は、減衰量が制御可能な減衰器を含み、前記信号に基づいて、前記減衰器の前記減衰量を制御する請求項２に記載の車載装置。 The vehicle-mounted device according to claim 2, wherein the operating unit includes an attenuator whose attenuation amount can be controlled, and controls the attenuation amount of the attenuator based on the signal.
  4. 　前記電圧監視部は、起動トリガ信号が入力されている時間内において動作し、
    　前記電圧監視部は、前記起動トリガ信号が入力されている時間以外において動作しない請求項１から請求項３のいずれか１項に記載の車載装置。     The voltage monitoring unit operates within the time when the start trigger signal is input, and operates.
    The vehicle-mounted device according to any one of claims 1 to 3, wherein the voltage monitoring unit does not operate except for the time when the activation trigger signal is input.
  5. 　前記動作部の出力信号の電圧値を基準電圧値と比較する比較回路を含み、
    　前記比較回路は、前記出力信号の電圧値が前記基準電圧値以上である場合に、前記起動トリガ信号を前記電圧監視部に入力し、
    　前記比較回路は、前記出力信号の電圧値が前記基準電圧値未満である場合に、前記起動トリガ信号を前記電圧監視部に入力しない請求項４に記載の車載装置。     Includes a comparison circuit that compares the voltage value of the output signal of the operating unit with the reference voltage value.
    When the voltage value of the output signal is equal to or higher than the reference voltage value, the comparison circuit inputs the start trigger signal to the voltage monitoring unit.
    The vehicle-mounted device according to claim 4, wherein the comparison circuit does not input the start trigger signal to the voltage monitoring unit when the voltage value of the output signal is less than the reference voltage value.
  6. 　前記起動トリガ信号は、前記車両の振動を検出するセンサが前記車両の振動を検出した場合に入力される請求項４に記載の車載装置。 The vehicle-mounted device according to claim 4, wherein the activation trigger signal is input when the sensor that detects the vibration of the vehicle detects the vibration of the vehicle.
  7. 　前記動作部は、前記外部電源から供給される供給電圧によって動作し、音出力を行う車載音響装置であり、
    　前記調整部は、前記電圧監視部が、前記供給電圧が前記第２閾値より低下していることを検出しているとき、前記車載音響装置の音出力のレベルを低下させて消費電流を抑える請求項１から請求項６のいずれか１項に記載の車載装置。     The operating unit is an in-vehicle audio device that operates by a supply voltage supplied from the external power source and outputs sound.
    The adjusting unit claims that when the voltage monitoring unit detects that the supply voltage is lower than the second threshold value, the level of the sound output of the vehicle-mounted acoustic device is lowered to suppress the current consumption. The vehicle-mounted device according to any one of claims 1 to 6.
PCT/JP2020/021248 2019-08-30 2020-05-28 Vehicle-mounted device WO2021038999A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019158589A JP2021037787A (en) 2019-08-30 2019-08-30 On-vehicle device
JP2019-158589 2019-08-30

Publications (1)

Publication Number Publication Date
WO2021038999A1 true WO2021038999A1 (en) 2021-03-04

Family

ID=74685417

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/021248 WO2021038999A1 (en) 2019-08-30 2020-05-28 Vehicle-mounted device

Country Status (2)

Country Link
JP (1) JP2021037787A (en)
WO (1) WO2021038999A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003170789A (en) * 2001-12-10 2003-06-17 Sony Corp Controller for electric power consumption of on-vehicle electric equipment
JP2008312404A (en) * 2007-06-18 2008-12-25 Panasonic Corp Power supply system
JP2011244182A (en) * 2010-05-18 2011-12-01 Mitsubishi Electric Corp Acoustic device
JP2016022841A (en) * 2014-07-22 2016-02-08 株式会社デンソー Vehicle device and state transition program

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003170789A (en) * 2001-12-10 2003-06-17 Sony Corp Controller for electric power consumption of on-vehicle electric equipment
JP2008312404A (en) * 2007-06-18 2008-12-25 Panasonic Corp Power supply system
JP2011244182A (en) * 2010-05-18 2011-12-01 Mitsubishi Electric Corp Acoustic device
JP2016022841A (en) * 2014-07-22 2016-02-08 株式会社デンソー Vehicle device and state transition program

Also Published As

Publication number Publication date
JP2021037787A (en) 2021-03-11

Similar Documents

Publication Publication Date Title
JP3818231B2 (en) Power circuit
US9106990B2 (en) Failure detection device for vehicle speaker
KR20050050447A (en) Apparatus for controlling temperature in audio amplifier
JP3189311B2 (en) Power supply for automotive electronic equipment
WO2021038999A1 (en) Vehicle-mounted device
EP0400643B1 (en) Amplifying apparatus with a differential amplifier stage
JP5685758B2 (en) VEHICLE CHARGE CONTROL DEVICE AND METHOD THEREOF
JP2010285122A (en) On-vehicle power supply adapter switch
JPH0486109A (en) Muting system
JP4554705B2 (en) Vehicle equipment and communication interface circuit used for the equipment
JPH0666592B2 (en) Power amplifier
JP6540518B2 (en) Electronic control unit
JP4307875B2 (en) Audio output circuit
JP5287088B2 (en) Power control circuit
KR101876734B1 (en) Controller Mounted On Vehicle and Method For Detecting Ignition Condition Thereof
JP2020108198A (en) Vehicular control device
JP2013038464A (en) Reset circuit
KR100804497B1 (en) Speed pulse stabilization apparatus at auto volume control system
JP2009015613A (en) Monitoring circuit, electronic control device, and method of controlling monitoring circuit
JPH0584085B2 (en)
JPH0823641A (en) Circuit for controlling output of car audio equipment
JP3601412B2 (en) Electronic equipment
KR0138710Y1 (en) Audio volumn control apparatus
JP3095869B2 (en) Vehicle safety device control system with failure diagnosis function
CN115379344A (en) Mute circuit and device of vehicle-mounted sound equipment and vehicle

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20858739

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20858739

Country of ref document: EP

Kind code of ref document: A1