JP6609945B2 - Vehicle instrument - Google Patents

Description

  The present invention relates to a vehicular instrument that displays vehicle information, for example, a vehicular instrument that supplies power to an external device.

  2. Description of the Related Art Conventionally, in-vehicle devices are known that include a USB (Universal Serial Bus) as an interface for connecting various peripheral devices (external devices) (see, for example, Patent Document 1). The USB standard connection cable (USB cable) includes a communication line and a power supply line, and can supply power (power supply) to peripheral devices as well as communication between devices.

  In addition, there are inverters that convert a direct current supplied from an in-vehicle battery into an alternating current of a commercial power supply voltage (for example, 100 V) and devices that have an external output terminal mounted on the vehicle, for example, disclosed in Patent Document 2.

JP 2011-150584 A JP 2013-233302 A

  However, the power supply function of these in-vehicle devices requires a configuration such as a surge cut circuit and a conversion circuit for obtaining a predetermined voltage, and there is room for improvement for mounting in a limited vehicle space.

  Accordingly, an object of the present invention is to provide a vehicular instrument that can supply power to an external device even in a space-saving manner, paying attention to the above-described problems.

The vehicle instrument of the present invention is
Display means for displaying vehicle information in a display image using electric power from the in-vehicle battery;
A surge cut circuit provided between the in-vehicle battery and the display means;
A power supply circuit that feeds power to an external device using the power from the in-vehicle battery supplied via the surge cut circuit;
A voltage detection circuit that outputs a detection signal based on a voltage of a power supply wiring connected to the vehicle battery;
Control means for controlling the display means so that the remaining electric energy or voltage value of the in-vehicle battery is displayed and output;
Switch means for switching a power supply state to the external device by a control signal from the control means based on the detection signal;
Provided between the surge cut circuit and the voltage detection circuit, a fuse for overcurrent protection to the external device,
In the same housing,
The control means determines a disconnection state of the fuse based on the detection signal .

  The display means, the surge cut circuit, and the power supply circuit are mounted on the same circuit board.

  The control means displays information on the power supply on the display means when the vehicle is not in an operating state and is in a power supply state to the external device.

  Further, the control means switches from the display of the accumulated mileage information of the vehicle and causes the display means to display information relating to the power supply.

  The present invention relates to an instrument for a vehicle and can supply power to an external device even in a space-saving manner.

The block diagram which shows the structure of embodiment of this invention. The figure which shows the meter for vehicles in embodiment same as the above. The figure which shows the process sequence of the control means in embodiment same as the above.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which a vehicle instrument of the present invention is applied as a composite instrument mounted on a motorcycle will be described with reference to the accompanying drawings.

  FIG. 1 is a block diagram showing a configuration according to the present invention. A vehicle meter A includes a display 1, an input unit 2, a control unit 3, an overvoltage protection circuit (surge cut circuit) 4, and a regulator 5. A voltage detection circuit 6, a fuse 7, a switch means 8, and a DC / AC conversion circuit (power supply circuit) 9.

  These configurations are mounted on the same circuit board, and are electrically connected via a copper foil pattern or wiring. In addition, these configurations are held in a case (housing) K of synthetic resin or the like, and are provided on the vehicle front side, in this case, near the center of the steering wheel so that the vehicle user can easily check during driving.

  As shown in FIG. 2, the display 1 has a liquid crystal display panel (display unit) 11 that forms a display image (display image) by switching between transmission and non-transmission, and scales and numerical values according to the rotation of a motor serving as a drive source. The indicator-type display unit 12 can be applied to indicate a desired vehicle information such as a vehicle speed, a travel distance, a remaining power amount of an in-vehicle battery, an alarm, etc., when the vehicle is powered on, such as during normal travel. Output means for displaying based on a control signal from the control means 3. The display device 1 is provided with a backlight made of a light emitting diode, and is provided on the opposite side of the display surface of the display device 1. In this case, an LED chip element provided on the circuit board can be applied to the backlight, and the circuit configuration is such that the output luminance can be changed according to a control signal from the control means 3. Note that the backlight may be an edge light system using a light guide, instead of the transmitted illumination.

  The input means 2 is a switch for switching whether or not to output power to an external device via an AC power supply terminal P described later, and a push lock switch can be applied. Further, the input unit 2 outputs an operation signal corresponding to the pressing operation of the vehicle user to the control unit 3. Note that the input means 2 is a trip switch for switching and displaying the accumulated travel distance or the section travel distance on the output screen of the display 1 or for setting the illumination brightness of the vehicle meter A including the display 1. It can also be applied as a dimmer switch. Moreover, the input means 2 can also be configured by connecting to a switch outside the vehicle meter A, for example, a handle switch, via a wiring, in addition to the switch provided in the vehicle meter A.

  The control means 3 is provided with a storage unit such as a ROM and a RAM (not shown) used for storing a predetermined program and various data, a storage area at the time of calculation, a CPU for performing arithmetic processing according to the predetermined program, an input / output interface, and the like. A microcomputer can be applied.

  Further, the control means 3 inputs operation signals from the input means 2 and vehicle information based on various sensors of the vehicle via a dedicated communication cable (multiplex communication line), and displays the display 1 according to these signals. A control signal for controlling is generated and output. In this case, the vehicle meter A is connected via the power supply wiring W1 for receiving power supply from the in-vehicle battery B and the communication cable W2 enabling communication with the main switch unit C, other ECUs, and the like. Has been.

  When the main switch (start switch) of the separately mounted main switch unit C is operated from off to on, the control means 3 starts the vehicle meter A and displays vehicle information such as the vehicle speed on the display 1. And a power saving mode in which the normal display output of the vehicle instrument A is stopped and the power saving operation is performed by turning off the main switch.

  The overvoltage protection circuit 4 is a surge cut circuit that is connected to the power supply wiring W1 and protects subsequent electronic components (such as the regulator 5) by reducing excessive voltage from the in-vehicle battery B and instantaneous noise. The overvoltage protection circuit 4 can perform the above-described protection not only for electronic components mounted on the vehicle meter A but also for external devices connected to the AC power supply terminal P. Note that not only the overvoltage protection circuit 4 but also an overcurrent protection circuit can be provided as a surge cut circuit.

  The regulator 5 can be a constant voltage circuit such as a DC / DC converter. In this case, the regulator 5 is connected to the power supply wiring W1 via the overvoltage protection circuit 4 and supplies power to the control means 3 using the power of the in-vehicle battery B. A voltage adjustment circuit that generates and outputs a predetermined voltage for performing (power supply) is supplied, and a battery voltage of about 12 V is stepped down to a 5 V control means 3 drive voltage and supplied.

  The voltage detection circuit 6 is a detection circuit that detects the voltage (potential) of the power supply wiring W1 and includes a voltage dividing circuit for conversion into an electric signal that can be input by the control means 3. The voltage detection circuit 6 outputs a detection signal based on the voltage of the power supply wiring W <b> 1 to the control means 3. Based on this detection signal, the control means 3 determines whether or not a voltage for normally driving the control means 3 is obtained, and a determination for outputting an alarm to the display device 1 indicating the degree of deterioration of the in-vehicle battery B. The remaining electric energy of the in-vehicle battery B can be determined and the detection signal is used for many purposes. Further, the control means 3 can determine the disconnection state of the fuse 7 based on the detection signal from the voltage detection circuit 6, and can output a display prompting the display device 1 to replace based on the determination result.

  The fuse 7 is provided between the overvoltage protection circuit 4 and the switch means 8 as an overcurrent protection element when a load is connected to the external device D so that a larger current than necessary does not flow to the external device D. regulate. The fuse 7 can be reached by opening the lid 71 provided on the case K, and can be replaced from here when the fuse 7 is blown. In this case, a waterproof structure such as a sealing is applied to the lid 71 and the portion of the case K that contacts the lid 71.

  The switch means 8 can be applied with a relay element, and based on a control signal from the control means 3, whether the electric power of the in-vehicle battery B input through the overvoltage protection circuit 4 or the fuse 7 is supplied to the DC / AC conversion circuit 9. No (energization / disconnection) can be switched.

  The DC / AC conversion circuit (power supply circuit) 9 is a circuit that converts electric power (about 12 V direct current) from the in-vehicle battery B inputted through the switch means 8 into commercial power supply voltage about 100 V alternating current, and an inverter And a transformer, and is connected to the AC power supply terminal P. The AC power supply terminal P is provided in the case K and can be connected by inserting a power supply plug of the external device D. The AC power supply terminal P may be configured to be routed and provided outside the vehicle instrument A using a wiring, for example, a glove box of a vehicle.

  Hereinafter, the processing procedure of the control means 3 according to the present invention will be described with reference to FIG.

  Based on the operation state of the main switch unit C, the control means 3 performs state determination processing for determining whether or not the operation of the vehicle is stopped (step S1). In addition, the control means 3 should just be able to determine the presence or absence of electric power generation (charging of the vehicle-mounted battery B), such as a vehicle-mounted alternator. Or by determining the operating state of the power generation unit.

  The control means 3 performs the operation determination process which determines the operation state of the input means 2 when it determines with the operation | movement of a vehicle being a stop state by this state determination process (step S2). Based on this operation state, the control means 3 can determine whether or not the vehicle user intends to output power to the external device D via the AC power supply terminal P. Therefore, the vehicle user can select not to supply power from the AC power supply terminal P even if the AC power supply terminal P and the power supply plug of the external device are connected.

  When it is determined by the operation determination process that the vehicle user has permitted the power supply to the external device D, the control unit 3 determines the remaining electric energy of the in-vehicle battery B based on the detection signal from the voltage detection circuit 6. A voltage determination process for determining whether or not there is sufficient is performed (step S3). The control means 3 sets a predetermined voltage threshold (for example, a value at which the output voltage of the in-vehicle battery B reaches 10V) in consideration of sufficient power necessary for starting the vehicle, and the detection signal And a predetermined voltage threshold.

  When the remaining electric energy of the in-vehicle battery B is sufficient by the voltage determination process, the control means 3 drives the switch means 8 to the energized state and passes the AC power supply terminal P via the DC / AC conversion circuit 9. The external device D connected to is urged to supply power (step S4). Moreover, the control means 3 prompts the display output which shows the remaining electric energy or voltage value of the vehicle-mounted battery B using the liquid crystal display panel 11 of the indicator 1 (step S5). This display output serves as a guide for the vehicle user to operate the generator by operating the main switch C and to supply power to the external device D.

  When the remaining capacity of the in-vehicle battery B is not sufficient by the voltage determination process, the control means 3 measures the elapsed time since the determination result has occurred and determines whether or not the predetermined elapsed time has been reached. (Step S6). The predetermined elapsed time is set to have a small effect on the power consumption of the in-vehicle battery B and to prepare for power supply interruption of the external device D. In this case, the control means 3 is set to 60 seconds as the predetermined elapsed time, and in a predetermined area of the liquid crystal display panel 11 of the display 1 that displays the accumulated travel distance or the like in the normal mode, until power is cut off from the AC power supply terminal P. Is displayed (step S7).

  Further, the control means 3 stops the display output by the display 1 and cuts off the electric power from the AC power supply terminal P when the predetermined elapsed time is reached by the determination process in step S6. Is driven (step S8). Thereby, even if the main switch C is in an OFF state, power can be supplied to the external device D within a range that does not affect the operation of the vehicle.

  By repeating the above processing, power is supplied from the vehicle meter A to the external device D, and the state can be confirmed by the display 1.

  Such a vehicle meter A includes a liquid crystal display panel 11 that displays vehicle information using electric power from the in-vehicle battery B, an overvoltage protection circuit 4 provided between the in-vehicle battery B and the liquid crystal display panel 11, A DC / AC conversion circuit 9 that supplies power to the external device D by using the power of the in-vehicle battery B supplied via the overvoltage protection circuit 4 is provided in the same case K.

  Therefore, not only can the overvoltage protection circuit 4, the power supply housing, the circuit board, the heat dissipation structure, the wiring from the in-vehicle battery B be used together, but also a vehicle that can supply power to the external device D even in a small space. It becomes meter A. Moreover, the display 1 for displaying vehicle information at the time of a normal driving | running | working etc. can be shared as a display means which outputs the display regarding electric power feeding.

  Although the vehicular instrument of the present invention has been described as an example in the configuration of the above-described embodiment, the present invention is not limited to this, and other configurations depart from the gist of the present invention. It goes without saying that various improvements and design changes can be made without departing from the scope. In addition, although an example of a vehicle instrument mounted on a motorcycle having a small battery capacity compared to a four-wheeled vehicle has been described as an example, it can also be applied to an electric motorcycle or an electric vehicle using an electric motor as a drive source. It is also possible to input voltage and remaining capacity based on vehicle information from the battery unit, and to switch the power supply state based on this.

  Further, the vehicle instrument A connected to the external device D that requires an AC power source has been described. For example, USB (Universal Serial Bus) can be applied as an interface for connecting various external devices D. In this case, a regulator for outputting 5 V can be used as the power supply circuit by replacing the DC / AC conversion circuit 9 described above. Further, in this case, information from the external device D is displayed on the display 1 by communicating with the control means 3 through a USB standard communication line provided separately, or vehicle information input by the control means 3 is displayed. It can also be displayed on an external device D.

  Further, for example, the processing procedure and circuit configuration of the control means 3 described above can be applied to a configuration in which power is supplied using a contactless power supply device, and the same effect as the above-described effect can be obtained.

  The present invention relates to a vehicular instrument, and is suitable, for example, as a vehicular instrument that is mounted on a moving body including an automobile, a motorcycle, an agricultural machine, or a construction machine.

1 Display 11 Liquid crystal display panel (display means)
2 Input means 3 Control means 4 Overvoltage protection circuit (surge cut circuit)
5 Regulator 6 Voltage detection circuit 7 Fuse 8 Switch means 9 DC / AC conversion circuit (power supply circuit)
A Vehicle instrument B Car-mounted battery C Main switch unit D External device K Case (housing)
P Power supply terminal (output terminal)

Claims (5)

Display means for displaying vehicle information in a display image using electric power from the in-vehicle battery;
A surge cut circuit provided between the in-vehicle battery and the display means;
A power supply circuit that feeds power to an external device using the power from the in-vehicle battery supplied through the surge cut circuit;
A voltage detection circuit that outputs a detection signal based on a voltage of a power supply wiring connected to the vehicle battery;
Control means for controlling the display means so that the remaining electric energy or voltage value of the in-vehicle battery is displayed and output;
Switch means for switching a power supply state to the external device by a control signal from the control means based on the detection signal;
Provided between the surge cut circuit and the voltage detection circuit, a fuse for overcurrent protection to the external device,
In the same housing,
The vehicle instrument , wherein the control means determines a disconnection state of the fuse based on the detection signal .   The vehicle instrument according to claim 1, wherein the display unit, the surge cut circuit, and the power supply circuit are mounted on the same circuit board.   2. The vehicle instrument according to claim 1, wherein the control unit causes the display unit to display information on the power supply when the vehicle is not in an operating state and is in a power supply state to the external device.   2. The vehicle instrument according to claim 1, wherein the control unit causes the display unit to display information on the power supply by switching from display of the accumulated travel distance information of the vehicle. The vehicular instrument according to claim 1, further comprising a lid provided on the housing for replacing the fuse.

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