JP4332747B2 - Warning device control circuit - Google Patents

Description

  The present invention relates to a control circuit for a warning device that notifies warning information by means of visual notification means having a light emitter and other notification means in response to switching of on / off states of a plurality of switch means, and in particular, for a seat belt of a vehicle. The present invention relates to a control circuit of a warning device that notifies mounting or non-mounting.

  2. Description of the Related Art Conventionally, a warning device is known that issues an alarm or the like when a vehicle seat belt is not worn, and informs a user that the seat belt is not worn as warning information (see, for example, Patent Document 1). .

In such a seat belt warning device, when a warning is issued for seats other than the driver's seat, a plurality of switch means for detecting whether or not a plurality of seat belts provided corresponding to the seats are on / off In response to the switching of the OFF state, a notification means such as a visual notification means for displaying a warning or an auditory notification means for generating a warning sound is driven. In such a configuration, by making the warning operation different depending on the seat where the seat belt is not attached, for example, when the seat belt is not attached in the driver's seat, a particularly strong warning is given, and when the seat belt is not attached in another seat A method for making a weak warning is known (see, for example, Patent Document 2).
JP 63-170148 A JP-A-6-278574

  However, when different warnings are given for seat belts depending on the seats, it is necessary to provide as many input ports as the number of seats for the microcomputers constituting the control means. The problem is that a noise absorbing circuit or the like for determining whether the switch means for detecting mounting / non-mounting is in an on state or an off state is required individually, which complicates the circuit configuration and increases the manufacturing cost. was there.

  In view of the above problems, an object of the present invention is to provide a control circuit for a warning device that can change a warning operation when a seat belt is not worn according to a seat with a simpler circuit configuration.

  In order to solve the above problems, the control circuit of the warning device according to the present invention notifies the warning information by the visual notification means having a light emitter and the other notification means in response to switching of the on / off states of the plurality of switch means. A control circuit for a warning device, wherein the first and second switch means as the switch means are connected in parallel, one end of the first and second switch means is connected to a ground level, and the first The other end of the switch means is connected to a power supply and a control means for controlling the other notification means, the other end of the second switch means is connected to the power supply via the light emitter, and the first switch The other end of the means and the control means, and the other end of the second switch means and the light emitter are connected via a rectifier element.

  The other end of the first switch means and the control means are connected to the cathode side of the rectifier element, and the other end of the second switch means and the light emitter are connected to the rectifier element. It is connected to the anode side.

  The light emitter emits light when at least one of the first and second switch means is in an ON state, and the control means is the other informing means when the first switch means is in an ON state. Is driven.

  The other informing means is an auditory informing means for emitting a predetermined warning sound.

  Further, the first switch means is turned on when it is detected that the seat belt of the driver's seat is not attached, and the second switch means is in a state where the seat belts of seats other than the driver's seat are not attached. When it is detected that it is present, it is turned on.

  The present invention relates to a control circuit for a warning device that notifies warning information by visual notification means having a light emitting element and other notification means in response to switching of on / off states of a plurality of switch means, and in particular, for a seat belt of a vehicle. The present invention relates to a control circuit of a warning device for notifying wearing or not wearing, and it is possible to vary a warning operation when a seat belt is not worn depending on a seat with a simpler circuit configuration.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 shows a control circuit provided in a warning device for notifying that a seat belt is not worn as warning information by means of visual notification means A and auditory notification means (other notification means). The control circuit connects the first and second switch means 1 and 2 in parallel with each other with respect to the power source V and the ground level, and connects one end of the first and second switch means 1 and 2 to the ground line L1. The other end of the first switch means 1 is connected to the power supply V and the control means 3 for controlling the auditory alarm means B via the power line L2, and the second switch means 2 is connected to the ground level. The end is connected to the power source V through the LED (light emitting body) 4, the protective resistor R1 and the power line L2 provided in the visual notification means A, and a between the other end of the first switch means 1 and the control means 3 The diode (rectifier element) 5 is forward from the point b to the point a between the point b and the point b between the other end of the second switch means 2 and the limiting resistor R1 located on the cathode side of the LED 4. It is connected so that it becomes. Specifically, the diode 5 has a cathode side connected to point a and an anode side connected to point b. Reference numeral 6 is connected between the point a and the control means 3 to prevent the current from wrapping around when the first and second switch means 1 and 2 are in the OFF state, so that the LED 4 does not light up. It is a diode for. R1 to R3 are limiting resistors, and R4 and 7 are noise absorbing resistors and capacitors.

  The first switch means 1 is for detecting whether or not a seat belt provided corresponding to the driver's seat of the vehicle is mounted. For example, the plate portion of the seat belt is not engaged and fixed to the buckle. In this case, the seat belt is turned on because the seat belt is not attached, and when the plate portion provided on the seat belt is correctly engaged and fixed to the buckle, the seat belt is turned on as being attached. .

  The second switch means 2 is for detecting whether or not a seat belt provided corresponding to the passenger seat which is a seat other than the driver's seat is attached. For example, the second switch means 2 Similarly, the on state and the off state are switched. The second switch means may further include a switch means for detecting whether or not a seat belt provided corresponding to the rear seat is mounted in addition to the passenger seat.

  The control means 3 is mainly composed of a microcomputer, and an input port for inputting a state signal indicating the state of the first switch means 1 and a drive signal for driving the hearing notification means B based on a predetermined processing operation program. An input / output interface having an output port to output; a CPU for executing the processing operation program; a ROM in which the processing operation program or the like is stored; a RAM in which data processed by the CPU is temporarily stored; And a storage unit composed of an EEPROM, a backup RAM, or the like for storing predetermined data in a nonvolatile manner. The control means 3 determines whether the first switch means 1 is on or off based on the voltage level of the state signal. In this embodiment, the voltage level is low ( When the voltage level is high (for example, 5 V), the first switch means 1 is off. Judge that there is.

  The LED 4 is provided as a light source of the visual notification means A that performs a predetermined warning display, and exhibits red light emission, for example. The visual notification means A is provided, for example, in a vehicle instrument disposed in the instrument panel of the vehicle, and is transmitted through a display unit (not shown) that is printed on the display board of the vehicle instrument and indicates that the seat belt is not attached. Illumination makes a red warning display as a warning action.

  The auditory informing means B emits a predetermined warning sound as a warning action in response to the drive signal from the control means 3, and includes sound generating means such as a buzzer.

  The diode 5 rectifies the flow of current from the contact point b to the contact point a. In the present embodiment, the first switch means 1 is in the off state and the second switch means 2 is on. In this state, a current flows from the contact point a toward the contact point b, and this current is prevented from flowing into the ground line L1 via the second switch means 2. The control means 3 erroneously recognizes the voltage level determination when the driver's seat belt is attached by the diode 5 and the passenger's seat belt is not attached (the erroneous recognition that the voltage level has become low level). Can be prevented.

  This control circuit is turned on when the vehicle ignition switch 8 is turned on, and a predetermined warning is given to the visual notification means A and the auditory notification means B according to the states of the first and second switch means 1 and 2. It is what makes it work.

  In the control circuit, when the seat belts of the driver seat and the passenger seat are not attached, that is, when the first and second switch means 1 and 2 are both in the on state, the anode side of the LED 4 is connected to the power source V. Since the cathode side is connected to the ground level via the first and second switch means 1 and 2, the LED 4 emits red light and the visual notification means A makes the warning display (lights up). The control means 3 determines that the voltage level of the input port is at a low level because the current flows to the ground line L1 via the power supply line L2 and the first switch means 1, and the first switch means 1 Is turned on and the seat belt of the driver's seat is not worn, and the auditory alerting means B is driven to generate the warning sound. Accordingly, the user can perform at least the warning display of the visual notification means A and the generation of the warning sound of the auditory notification means B as warning operations when the seat belt is not worn, so that the seat belt of the seat including at least the driver's seat is provided. Can be recognized as not installed.

  Further, the seat belt of the driver's seat is not attached and the seat belt of the passenger seat is attached, that is, the first switch means 1 is in the on state and the second switch means 2 is in the off state. In this case, since the anode side of the LED 4 is connected to the power supply V and the cathode side is connected to the ground level via the first switch means 1, the LED 4 emits red light and the visual notification means A displays the warning. Further, the control means 3 determines that the voltage level of the input port of the control means 3 is low level, and determines that the first switch means 1 is in the on state and the seat belt of the driver seat is not attached. Then, the warning sound is generated in the hearing notification means B. Accordingly, the user performs the warning display of the visual notification means A and the generation of the warning sound of the auditory notification means B as warning operations without wearing the seat belt, so that the seat belt in the driver's seat is not worn. You can recognize that there is.

  Further, when the driver's seat belt is attached and the passenger seat's seat belt is not attached, that is, when the first switch means 1 is in the off state and the second switch means 2 is in the on state. Since the anode side of the LED 4 is connected to the power source V and the cathode side is connected to the ground level via the second switch means 2, the LED 4 emits red light and the visual notification means A displays a warning. Further, since the first switch means 1 is in the OFF state and no current flows from the contact point a to the contact point b by the diode 5, the control means 3 determines that the voltage level of the input port is high. Then, it is determined that the first switch means 1 is in the off state and the seat belt of the driver's seat is attached, and the hearing notification means B is not driven. Therefore, the user recognizes that the seat belts of the seats (passenger seats) other than the driver's seat are not worn by only displaying the warning display of the visual notification means A as a warning operation when the seat belt is not worn. can do.

  Further, when the seat belts of the driver seat and the passenger seat are attached, that is, when the first and second switch means 1 and 2 are both in the off state, the LED 4 is in a non-light emitting state. Further, the control means 3 determines that the first switch means 1 is in the off state, and does not drive the auditory alarm means B. Accordingly, neither the warning display of the visual notification means A nor the generation of the warning sound of the auditory notification means B is made, and the user recognizes that the seat belts of the driver seat and the front passenger seat are attached. it can.

  The control circuit of the warning device connects the first and second switch means 1 and 2 in parallel, connects one end of the first and second switch means 1 and 2 to the ground level, and the first switch means. The other end of 1 is connected to the power supply V and the control means 3 for controlling the other notification means B, the other end of the second switch means 2 is connected to the power supply V via the light emitter 4, and the power line L1 The point a between the other end of the first switch means 1 and the control means 3 is connected to the cathode side of the diode 5, and the point b between the other end of the second switch means 2 and the LED 4 is connected to the diode 5. By connecting to the anode side, there is no need to provide as many input ports as the number of seats in the microcomputer constituting the control means as in the prior art, and the switch means for determining the state by the control means 3 is the first switch. Input only by means 1 It is possible to reduce the number of over preparative and determination circuit, it is possible to vary the warning operation of the seat belt is not mounted according to the seat with a simpler circuit configuration.

  The present invention can be applied to a control circuit of a warning device that notifies warning information by a visual notification means having a light emitter and other notification means in response to switching of on / off states of a plurality of switch means. For example, the present invention can be applied to a control circuit of a warning device that notifies opening / closing of a vehicle door as warning information, in addition to a warning device for a seat belt.

The figure which shows the control circuit of the warning device which is embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st switch means 2 2nd switch means 3 Control means 4 LED (light-emitting body)
5 Diode (rectifier element)
6 Diode 7 Capacitor 8 Ignition switch A Visual notification means B Auditory notification means (other notification means)
L1 Ground line L2 Power line R1 to R3 Limiting resistor R4 Resistance V Power source

Claims (5)

A control circuit for a warning device that notifies warning information by means of visual notification means having a light emitter and other notification means in response to switching of on / off states of a plurality of switch means,
Connecting the first and second switch means as the switch means in parallel;
One end of the first and second switch means is connected to a ground level;
Connecting the other end of the first switch means to a power source and a control means for controlling the other notification means;
Connecting the other end of the second switch means to the power source via the light emitter,
The other end of the first switch means and the control means, and the other end of the second switch means and the light emitter are connected via a rectifier element. Control circuit for the warning device. The other end of the first switch means and the control means are connected to the cathode side of the rectifying element, and the other end of the second switch means and the light emitter are connected to the anode side of the rectifying element. The control circuit of the warning device according to claim 1, wherein the control circuit is connected to the alarm device. The light emitter emits light when at least one of the first and second switch means is on, and the control means drives the other notification means when the first switch means is on. The control circuit for a warning device according to claim 1, wherein: The warning device control circuit according to claim 1, wherein the other notification means is an auditory notification means that emits a predetermined warning sound. The first switch means is turned on when it is detected that the seat belt of the driver's seat is not attached, and the second switch means is that the seat belts of seats other than the driver's seat are not attached. 2. The control circuit for an alarm device according to claim 1, wherein the control circuit is turned on when detected.

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