JP2531282Y2 - Vehicle alarm display - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a vehicle having a direct view window in a left door portion.
The present invention relates to an alarm display device for notifying a driver of a situation in which a front seat back of a passenger seat is tilted forward during traveling.

<Conventional Technology> In a large vehicle, a direct view window through which the outside can be seen is provided in the left door portion in order to improve the visibility of the left side when turning left. However, if the front seatback of the passenger seat is tilted forward, the view of the direct-view window is impeded, so that the passenger seatback is prevented from running in the forward tilted state. An alarm display device is provided to provide an alarm and display when the seat back is tilted forward to notify the driver of this.

 FIG. 3 shows an example of such a conventional alarm display device.

In the drawing, a parallel circuit of a brake fluid leakage alarm switch 1 and a brake air booster overstroke alarm switch 2 and a series circuit of a brake alarm lamp 3 and a series circuit of a brake air pressure alarm switch 4 and an air pressure alarm lamp 5 are key switches in parallel with each other. 6 and connected to the battery 7.

A parking brake switch 8 whose contact is switched between an operating position and a releasing position of the parking brake is connected to the battery 7 via the key switch 6. A series circuit of a seat alarm buzzer 9 and a seat switch 10 that is turned on when the front seat back of the passenger seat is in the forward tilt state is connected between the release contact X of the parking brake switch 8 and the ground. Also, the parking brake switch 8
A parking brake lamp 11 is interposed between the operating-side contact Y of the power supply and the ground. The series circuit of the parking brake switch 8, the seat alarm buzzer 9 and the seat switch 10, and the series circuit of the parking brake switch 8 and the parking brake lamp 11 are connected to the battery 7 in parallel with the above-mentioned series circuit of the brake system.

Also, the release contact X of the parking brake switch 8
Between the seat alarm buzzer 9 and the brake alarm buzzer
Reference numeral 12 is connected to the ground via alarm switches 1, 2 and 4 of the respective brake systems. Note that rectifier diodes 13 to 16 are provided in each alarm circuit of the brake system.

An intermediate point A between the seat alarm buzzer 9 and the seat switch 10 is connected to a terminal a of a control unit 17 containing a microcomputer, and an intermediate point B between the operating contact Y of the parking brake switch 8 and the parking brake lamp 11 is provided. , Also terminal b of control unit 17
It is connected to the. The control unit 17 determines a passenger seat back state during traveling based on the voltage level of the terminal a, and transmits display data to the display unit 18 when the seat back is determined to be in a forward lean state.

The seatback state detecting operation of the conventional device having such a configuration is such that, when the key switch 6 is turned on and the control unit 17 is in the operating state, when a current flows from the terminal a in a direction indicated by a solid line in the drawing, this current is detected. The decrease in the voltage level at the intermediate point A due to the flow is detected, and it is determined that the seat switch 10 is ON and the seat back is tilted forward and displayed.

<Problem to be solved by the invention> However, in the case of the conventional circuit configuration, the alarm system of the brake system is also configured to be linked to the operation of the parking brake, and is electrically connected to the seat back alarm circuit, When any one of the brake fluid leak alarm switch 1, brake air booster overstroke alarm switch 2 and brake air pressure alarm switch 4 is in the ON state, current flows along the path shown by the broken line in the figure. Therefore, an erroneous alarm is generated from the seat alarm buzzer 9, and it is determined that the seat switch 10 is ON despite the OFF state of the seat switch 10 due to a decrease in the voltage level of the intermediate point A, and the seat back forward lean determination is performed. Made display part
There is a possibility that the display is incorrectly displayed on the display 18.

Further, since the seat back state is determined only by the voltage level of the intermediate point A, if the seat switch 10 is in the ON state, regardless of the state of the parking brake switch 8, that is, even when the vehicle is stopped. There is a problem that a display output is generated when the seat back is tilted forward.

The present invention has been made in view of the above circumstances, and prevents erroneous alarms caused by current sneak to the other alarm circuit side, and has a reliability that displays an alarm only when the seat back leans forward when the parking brake switch is released. It is an object of the present invention to provide a tall vehicle warning display device.

<Means for Solving the Problems> For this reason, the present invention provides a parking brake switch which is connected to a battery via a key switch and whose contact switches between an operating position and a releasing position of the parking brake, and a releasing side of the parking brake switch. An alarm buzzer which is sequentially connected in series between the contact and the ground, an alarm buzzer which generates an alarm when energized, a seat switch which is turned on by detecting a forward tilt state of the seat back of the passenger seat, a release contact of the parking brake switch and the alarm Another alarm circuit connected between the buzzer and the ground, a determination unit that determines a seat back state based on a voltage level at an intermediate point between the alarm buzzer and the seat switch, and a determination result of the determination unit. An alarm display device for a vehicle, comprising: a display unit for displaying an alarm; A rectifier diode that allows only the current flow from the alarm buzzer side to the seat switch direction between the alarm buzzer and the parking brake switch, in addition to the voltage level at the intermediate point between the alarm buzzer and the seat switch. Input the voltage level of the intermediate point between the working-side contact and the parking brake lamp provided between the working-side contact and ground,
A structure in which a seat back state and a parking brake state are respectively determined based on each voltage level, and a seat back forward lean determination signal is output to the display means only when it is determined that the parking brake is released and the seat back is leaning forward. And

<Operation> In such a configuration, the rectifier diode interposed between the alarm buzzer and the middle point of the sheet switch and the alarm buzzer in which the terminal of the determination means is maintained provides an alarm buzzer accompanying the current sneak to another alarm circuit side. To prevent the false alarm from occurring. In addition, the operation state of the parking brake switch and the operation state of the seat switch are each determined, and the combination of the two determination results displays the seat back forward tilt display only when the parking brake is released and the seat back is tilted forward. Therefore, it is possible to prevent useless display when the vehicle stops, which has no problem even if the seat back is tilted forward.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.
The same elements as those in the related art are denoted by the same reference numerals, and description thereof is omitted.

1, the seat alarm buzzer 9 connected to the terminal a of the control unit 17, the intermediate point A of the seat switch 10, and the seat alarm buzzer 9 are shown.
A rectifier diode 21 is interposed so that the direction from the seat alarm buzzer 9 to the seat switch 10 is forward.

The control unit 17 inputs the voltage level of the intermediate point A and the voltage level of the intermediate point B between the operating contact Y of the parking brake switch 8 and the parking brake alarm lamp 11 from terminals a and b, respectively. It is configured to make a determination of a seat back alarm display based on both voltage levels.

Next, the seat back alarm display determining operation of the apparatus of this embodiment will be described with reference to FIG.

When the voltage levels of both terminals a and b of the control unit 17 are both at the H level, the seat switch 10 is turned off, the parking brake switch 8 is connected to the operating side contact Y, and the seat back is tilted forward. It is determined that the vehicle is in a stopped state and no display is performed (pattern 1).

When the voltage levels of the terminals a and b are H and L, respectively, the seat switch 10 is turned off and the parking brake switch 8 is turned off.
Is connected to the release-side contact X, and the display is not performed because it is determined that the vehicle is in the running state but the seat back is not in the forward leaning state (pattern 2).

When the voltage levels of the terminals a and b are L and H, respectively, the seat switch 10 is ON and the parking brake switch 8
Is connected to the operating-side contact Y, and it is determined that the seatback is in the forwardly inclined state but the vehicle is in the stopped state, and no display is performed (pattern 3).

When the voltage levels of the terminals a and b are L and L, respectively, the seat switch 10 is ON and the parking brake switch 8
Is connected to the release side contact X, the vehicle is in the running state, the seat back is in the forward leaning state, and it is determined that the view of the direct view window of the left door is obstructed.
Generates a front-back tilting display output of the seat back and displays it on the display unit 18 (pattern 4). At this time, current flows through the release contact X of the parking brake switch 8, the seat alarm buzzer 9, the rectifier diode 21, and the seat switch 10, and an alarm is generated from the seat alarm buzzer 9.

In this way, even if the seat switch 10 is ON, when the parking brake is in operation and the vehicle is stopped, the front-back display of the seat back is not displayed, and a wasteful operation as in the related art is not performed. No display is performed. Also, even if any of the alarm switches of the brake system are turned on, the current flow to the seat alarm buzzer 9 due to the current sneaking into the brake system can be blocked by the rectifier diode 21 as in the conventional art, so Can be prevented from occurring.

<Effects of the invention> As described above, according to the invention,
If the seat switch is in the ON state, it is possible to eliminate a useless display of performing the seatback forward leaning display regardless of the operation state of the parking brake. Further, it is possible to prevent occurrence of a false alarm of the seatback falling forward due to the detection of a failure in the other alarm circuit. Therefore, the reliability of the alarm display device can be improved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a judgment pattern of the above embodiment, and FIG. 3 is a circuit diagram of a conventional device. 6 ... key switch, 7 ... battery, 8 ... parking brake switch, 9 ... seat alarm buzzer, 10 ...
Seat switch, 17 Control unit, 18
Display unit, 21 rectifier diode, a, b terminals, X
Release side contact, Y… Actuating side contact

Claims (1)

(57) [Scope of request for utility model registration] A parking brake switch connected to a battery via a key switch and having a contact switched between an operation position and a release position of the parking brake; and a serially connected series connection between a release contact of the parking brake switch and ground. An alarm buzzer that generates an alarm at the time of energization and a seat switch that is turned on by detecting the forward tilt state of the seat back of the front passenger seat, and between the release contact of the parking brake switch, the alarm buzzer, and ground. A vehicle comprising: another alarm circuit to be connected; determining means for determining a seatback state based on a voltage level at an intermediate point between the alarm buzzer and the seat switch; and display means for displaying a determination result of the determining means. In the alarm display device, the alarm buzzer, the intermediate point of the seat switch and the alarm buzzer are connected from the alarm buzzer side. A rectifying diode that allows only a current flow in the direction of the switch, and the determining means includes, in addition to a voltage level at an intermediate point between the alarm buzzer and the seat switch, an operating contact of the parking brake switch and the operating contact. The voltage level at the midpoint between the parking brake lamp provided between the vehicle and the ground is input, and the seat back state and the parking brake state are determined based on each voltage level, and the parking brake is released and the seat back leans forward. An alarm display device for a vehicle, wherein a seat back forward lean determination signal is output to the display means only when it is determined that the vehicle is in the state.