JPH05270317A - Display device for disconnection of warning lamp - Google Patents

Abstract

PURPOSE:To provide a display device for the disconnection of a warning lamp to make a driver instantly and easily confirm the serious disconnected state of an abnormality alarming lamp of a vehicle through the lighting and nonlighting of the lamp by newly providing the display device for the disconnection of an alarm lamp with another alarm lamp for judging the disconnection of the lamp. CONSTITUTION:A terminal on one side is directly connected to a power source, and a terminal on the other side is connected to the rectifying device D1 of the first alarm lamp earthed through the first switch SW1 turned on when the rectifying device D1 and an ignition switch are turned on, and the terminal on one side is connected to the power source through the ignition switch. Voltage at the connecting point of rectifying devices D2-D7 connected to the terminal on the other side of plurality of the second alarm lamps L2-L7 earthed through the second switches SW2-SW7 to turn on the terminal on the other side at the time of the occurrence of abnormality is detected, and the detected voltage is compared with previously set up voltage at the time when all the lamps are normal, and when they do not mutually coincide, a signal for abnormality is issued to turn on or off the third alarm lamp WL for displaying the disconnection of the first and the second alarm lamps L1-L7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warning lamp lamp burn-out display device, and more particularly, to a warning lamp which can detect the lamp burn-out of various warning lamps provided in an automobile meter and display the warning lamp. The present invention relates to a lamp burnout display device.

[0002]

2. Description of the Related Art Conventionally, combination meters provided in vehicles, particularly automobiles, include speedometers, tachometers, fuel gauges,
In addition to major instruments such as water temperature gauges and rangefinders, various warning lamps are installed. These warning lamps are installed on both sides of the above-mentioned major instruments, and they are lit when a serious abnormality occurs in the vehicle while the vehicle is operating, and those that do not. There is a lamp.

There are, for example, the following seven types of warning lamps that are turned on to notify an occupant of an abnormality when a serious abnormality occurs in the vehicle while the vehicle is operating. That is, (1) a charging state warning lamp indicating an abnormality of the charging device,
(2) Air filter warning lamp that indicates when to replace the air filter, (3) Timing belt (T.
(Belt) T-belt warning lamp indicating replacement time, (4) segmenter warning lamp indicating abnormal segmenter, (5) exhaust temperature warning lamp indicating excessive rise in exhaust temperature, (6) automatic A / T, oil temperature, warning, which indicates an excessive rise in the oil temperature of the transmission
Lamp, (7) Brake indicating an abnormality in the brake system
There is a warning lamp. Further, these are provided with a lamp burn-out display device for automobile meters having a lamp burn-out check function. Other warning lamps include, for example, a parking brake warning lamp that indicates the operating state of the parking brake, a door warning lamp that indicates the open state of the door, and a remaining amount of fuel below a predetermined amount. There is a fuel-out warning lamp that lights up to prompt refueling when it becomes, and these lamps do not have a lamp-out display device for an automobile meter that has a function for checking the lamp out.

The lamp burnout check function will now be described. If the warning lamps in (1) to (7) above are broken and broken, the lamps will not light when the vehicle is in an abnormal state, and it will not be possible to convey the abnormality to the driver. Therefore, in order to prevent such a problem, the lamp burnout check function is provided in the warning lamp that shows a particularly important abnormality of the vehicle, and it comes on when the ignition switch is ON. There is something. That is, turn on the ignition switch
If any of the warning lamps (1) to (7) does not light up when the above is done, it means that the warning lamp that does not light up is broken.

FIG. 2 shows that the warning lamps (1) to (7) are turned on when the ignition switch is turned on.
1 shows a circuit configuration of a conventional lamp burn-out display device that is turned on even in an abnormal state that occurs when the internal combustion engine (engine) is operating thereafter.

In FIG. 2, L1 is the state of charge (CHG)
Warning lamp, L2 is air filter warning lamp, L3 is T belt warning lamp, L4 is segmenter warning lamp, L5 is exhaust temperature warning lamp, L6 is A / T oil temperature warning Lamp L7 is a brake warning lamp, and the state of charge warning lamp L1
One terminal is connected to the ignition switch IGN except for. In addition, one terminal of the charging state warning lamp L1 is directly connected to the battery CHG (+).

The other terminals of the warning lamps L1 to L7 are grounded via switches SW1 to SW7, respectively, and when an abnormal state occurs during engine operation,
One of the switches SW1 to SW7 in which the abnormality has occurred is O
The warning lamp that turned on and turned on is turned on.

A diode D1 is provided in the circuit between the state-of-charge warning lamp L1 and the switch SW1 so that the switch SW1 side serves as a cathode. In addition, each warning lamp L2-L7 and switch SW
The anodes of the diodes D2 to D7 are connected in the middle of the circuit connecting 2 to SW7, and the cathodes of these diodes D2 to D7 are connected to the circuit between the diode D1 and the switch SW1. ..

Table 1 below shows the operation modes of the lamp burn-out display device of the warning lamp of FIG.

[Table 1] Lamp burnout check mode Engine operating state Switch SW1 Each lamp IGN OFF OFF All lights off IGN ON (engine stop) ON All lights on Engine off OFF All lights Abnormal vehicle during engine operation-Abnormal In the conventional lamp burn-out display device of the warning lamp shown in FIG. 2, since the ignition switch IGN is OFF and the charging switch SW1 is OFF, the warning lamp L1 is turned on. All of L7 are in a non-lighting state. After that, when the ignition switch IGN is turned on while the engine is stopped, the charging switch SW1 is turned on and the current flows through the warning lamp L1 through the diode D1, so that the lamp L1 is turned on. At the same time, when the ignition switch IGN is turned on, one terminal of the warning lamps L2 to L7 is connected to the power supply (battery), and the diodes D2 to D2 are connected.
Since current flows through D7 and switch SW1,
The warning lamps L1 to L7 are turned on all at once.
By this lighting, it is understood that the warning lamps L1 to L7 are operating normally, and if there is a non-lighting lamp, it is known that the lamp is broken.

After that, when the engine is in operation, the charging switch SW1 is turned off, so that all of the warning lamps L1 to L7 are turned off and the lamp is turned off. And
When a vehicle abnormality occurs, the switch corresponding to the abnormality is turned on.
Therefore, for example, when the exhaust temperature rises excessively and becomes high, the switch SW5 is turned on, so that only the lamp in which the abnormality has occurred is turned on and the abnormality can be displayed to the occupant.

[0012]

However, in the conventional lamp burn-out display device of the warning lamp which operates as described above, the ignition switch IGN O
Since many lamps are lit at N hours (7 in the above example)
However, there is a problem that it is difficult for the driver to instantly check the lighting of each lamp before driving. That is, when the ignition switch IGN is turned on, there is a problem that it is not possible to instantly determine whether the non-lighting warning lamp is non-lighting due to disconnection or the warning lamp without the lamp burnout check function.

In view of the above, the present invention provides a warning lamp lamp burnout display with another lamp for judging the disconnection of the lamp, and a lamp which shows a serious abnormality for the vehicle due to lighting or non-lighting of this lamp. The purpose is to allow the driver to easily and instantly check the disconnection state.

[0014]

A lamp burnout indicator for a warning lamp that achieves the above object is provided in the vicinity of a main meter of a combination meter of an automobile, and when the automobile is in an operating state, a serious abnormality occurs in the automobile. A lamp burn-out display device that lights up to notify an occupant of an abnormal condition when one of the terminals is directly connected to the power supply and the other terminal is turned on when the rectifying element and the ignition switch are turned on. A first warning lamp that is grounded via a switch, and a plurality of terminals whose one terminal is connected to a power supply through an ignition switch and the other terminal is grounded through a second switch that is turned on in the event of an abnormality Second warning lamp and the other terminal of each of the second warning lamps when the first switch is turned on. As the earth, each warning,
A rectifying element provided in the lamp, a means for detecting the voltage at the connection point of each of the rectifying elements, and this detection voltage is compared with a preset voltage when all the lamps are normal, and when the detected voltage is normal for all the lamps Is provided with a warning lamp abnormality detection means for outputting an abnormality signal when the voltage is not, and a third warning lamp that is turned on or off according to the abnormality signal.

[0015]

According to the lamp burn-out display device of the present invention, one terminal is directly connected to the power source, and the other terminal is turned on by the rectifying element and the ignition switch.
The rectifying element of the first warning lamp, which is grounded via the first switch which is turned on at one time, and the second terminal which is connected to the power source via the ignition switch and is turned on at the time of an abnormality, on the other terminal. The voltage at the connection point of the rectifying elements respectively connected to the other terminals of the plurality of second warning lamps that are grounded via the switch is detected, and the detected voltage is the preset voltage when all the lamps are normal. Compared to. Then, when the detected voltage is not the voltage when all the lamps are normal, an abnormal signal is output, and the abnormal signal causes the third warning lamp to be turned on or off, thereby indicating that the warning lamp has burned out.

[0016]

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

FIG. 1 shows a warning of an embodiment of the present invention.
It shows the configuration of the lamp burnout display device,
The same components as those of the conventional lamp burnout indicator of the warning lamp shown in FIG. 2 are designated by the same reference numerals. Therefore, in the figure, the first warning lamp is the state of charge (CHG) warning lamp L1 and the second warning lamp is
Warning lamps L2-L7 in this order are air filter warning lamp, T-belt warning lamp, segmenter warning lamp, exhaust temperature warning lamp, A / T oil temperature warning lamp, and brake.・ It is a warning lamp. One terminal of each of the warning lamps L2 to L7 is connected to the ignition switch IGN, and one terminal of the state-of-charge warning lamp L1 is directly connected to the battery CHG (+).

The other terminals of the warning lamps L1 to L7 are grounded via the switches SW1 to SW7, respectively, and when an abnormal state occurs during engine operation,
One of the switches SW1 to SW7 in which the abnormality has occurred is O
The warning lamp that turned on and turned on is turned on.

A diode D1 is provided in the circuit between the state-of-charge warning lamp L1 and the switch SW1 so that the switch SW1 side serves as a cathode. In addition, each warning lamp L2-L7 and switch SW
The anodes of the diodes D2 to D7 are connected in the middle of the circuit connecting 2 to SW7, and the cathodes of these diodes D2 to D7 are connected to the circuit between the diode D1 and the switch SW1. ..

In addition to the basic lamp burn-out display device of the warning lamp constructed as described above, in this embodiment, the resistor R1 is inserted between the diode D1 and the switch SW1, and the diode of this resistor R1 is inserted. The terminal on the D1 side is pulled out by a resistor R2, and each is connected to a comparator OP.
1, OP2 connected to the inverting input terminal. The non-inverting inputs of the comparators OP1 and OP2 are connected to the respective connection points of the voltage-dividing resistors R3, R4, and R5 connected in series, and the respective non-inverting inputs of the ignition switch IGN are turned on. A predetermined voltage is applied to. Further, feedback resistors R6 and R7 are provided between the non-inverting inputs and outputs of the comparators OP1 and OP2, respectively, and the output of the comparator OP1 is connected to one input terminal of the NOR circuit G. Further, the output of the comparator OP2 is connected to the ignition switch IGN through the resistor R8.
And is also connected to the other input terminal of the NOR circuit G through the inverter IV.

The output of the NOR circuit G is grounded by a parallel circuit of resistors R9 and R10 connected in series with a capacitor C. The base of a transistor Q, whose emitter is grounded and whose collector is connected to a warning lamp WL, is connected to the connection point of the resistors R9 and R10 connected in series. In the present invention, this warning lamp WL is a third warning lamp newly provided for indicating the lamp out of the above-mentioned seven important warning lamps L1 to L7, and the other terminal is an ignition lamp. It is connected to the switch IGN.

Next, the operation of the lamp burn-out display device of the embodiment having the above-described structure will be described. For the sake of clarity, the output of the NOR circuit G is set to point A, and the inverter IV. Is output as point B. And here, (1) When all seven warning lamps are normal when the ignition switch IGN is turned on, (2) At least one of the seven warning lamps is turned on when the ignition switch IGN is turned on. If one is broken, (3) 3 in the ON state of the engine
The operation of each part of the lamp burn-out display device of the warning lamp of FIG. 1 in these three cases will be summarized as shown in Table 2 below.

[Table 2] Mode SW1 OP1 OP2 Point B Point A Point Q Lamp WL IGN ON Lamp Normal ON OFF [L] ON [H] [L] [H] ON Lighting IGN ON Lamp OFF ON OFF [L] OFF [L] [H] [L] OFF Non-light engine ON OFF ON [H] ON [H] [L] [L] OFF Non-light (1) When ignition switch is ON and all warning lamps are normal Is supplied with a predetermined voltage Vs at the inverting inputs of the comparators OP1 and OP2. By this voltage Vs, the comparator OP
1 turns off and comparator OP2 turns on so that the resistance R
The divided potential by 3, R4 and R5 is set in advance. When the comparator OP1 is OFF, its output is low level [L], and the output of this low level [L] is input to one of the NOR circuits G. When the comparator OP2 is ON, its output is at high level [H]. The output [H] of the comparator OP2 is inverted by the inverter IV and becomes [L] at the point B, and is input to the other side of the NOR circuit G. As a result, the level at the point A, which is the output of the NOR circuit G, becomes [H], so that the transistor Q is turned on and the lamp WL is turned on.

(2) When the ignition switch is ON and the warning lamp is abnormal In this case, a predetermined voltage Vi lower than the normal voltage Vs is input to the inverting inputs of the comparators OP1 and OP2. By this voltage Vi, the comparators OP1 and OP2 are both turned off and their outputs are both at the low level [L], and the level at the point B is inverted by the inverter IV to become the high level [H]. As a result, the level at the point A of the output of the NOR circuit G to which the low level [L] and the high level [H] are input becomes the low level [L], so that the transistor Q is turned off and the lamp WL becomes unlit. Become.

(3) During engine operation Since the ignition switch is OFF at this time, the voltage V at the normal time is applied to the inverting inputs of the comparators OP1 and OP2.
A predetermined voltage Vc higher than s is input. This voltage V
The comparators OP1 and OP2 are both turned on by c and their outputs are both at the high level [H], and the level at the point B is inverted by the inverter IV to become the low level [L]. As a result, the level at the point A of the output of the NOR circuit G to which the high level [H] and the low level [L] are input becomes the low level [L], so that the transistor Q is turned off and the lamp WL is not lit. Become.

Further, when the vehicle is in an abnormal state, one of the switches SW2 to SW7 in the abnormal place is turned on, so that only the warning lamp having the abnormality is turned on and the abnormality is displayed to the driver. Incidentally, the warning / lamp burn-out display may be provided with a self-holding circuit by a known technique or with a SW for further canceling.

As described above, in the present invention, the lamp burn-out can be checked by one dedicated lamp. Therefore, when the ignition switch is turned on before the driving, the driver pays attention only to the lamp burn-out dedicated warning lamp. It is now possible to check the lamp burnout, without any ambiguity, and to check the lamp burnout instantly and reliably.

[0028]

As described above, according to the lamp burn-out display device of the present invention, when the ignition switch is turned on, the abnormality detection of the warning lamp provided separately from the normal warning lamp is performed. A separate warning lamp for the lamp will be turned on or off.
There is an effect that the driver can easily detect the abnormality of the lamp.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of an embodiment of a lamp burnout display device for a warning lamp according to the present invention.

FIG. 2 is a circuit diagram showing a configuration of an example of a conventional lamp burnout display device for a warning lamp.

[Explanation of symbols]

 D1 to D7 diode G NOR circuit IV inverter L1 to L7 normal warning lamp OP1, OP2 comparator Q transistor R1 to R10 resistance WL WL 1 to L7 warning lamp for detecting abnormality

Claims (1)

[Claims] 1. A lamp burn-out display device provided near a main instrument of a combination meter of an automobile and lit to inform an occupant of the abnormality when the automobile is in operation and a serious abnormality occurs in the automobile. Where the first terminal is directly connected to the power source and the other terminal is turned on when the rectifying element and the ignition switch are turned on.
A first warning lamp that is grounded via a switch, and a plurality of terminals whose one terminal is connected to a power source through an ignition switch and the other terminal is grounded through a second switch that is turned on in the event of an abnormality Second warning lamps, a rectifying element provided in each warning lamp such that the other end of each second warning lamp is grounded when the first switch is turned on, A warning that compares the detected voltage with the voltage at the connection point of the rectifier and the preset voltage when all lamps are normal, and outputs an abnormal signal when the detected voltage is not the voltage when all lamps are normal .A warning lamp comprising: a lamp abnormality detecting means; and a third warning lamp which is turned on or off according to the abnormality signal. Lamp-out display device.