JPH0244587Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is applied to the operation of a lighting circuit connected between a battery and various lamps for night lighting, safe driving, etc. that are installed in various vehicles. When a malfunction occurs, for example, if the lighting switch installed between the headlamp and battery has poor continuity or the fuse blows out while driving, power is supplied directly from the battery to the headlamp and the lamp does not light up. The present invention relates to a lighting circuit compensating device for a vehicle that prevents accidents such as collisions that occur when such a vehicle occurs.

[Conventional technology]

Conventionally, a lighting circuit for a vehicle, such as a headlamp circuit for night lighting, has had a circuit structure as shown in FIG. That is, the lamp 1 is connected to the battery 2 via the fuse 3 and the lighting switch 4, and in the headlamp circuit, there is no possibility of disconnection due to natural blowing of the fuse 3, disconnection due to an overload phenomenon, or failure of the lighting switch 4. Due to reasons such as this, the lamp 1 may
may go out.

In conventional vehicle lighting circuits, lamp 1
Some kind of phenomenon occurred between and Batteryi 2,
There has not been a device equipped with a means for compensating for when the lamp 1 is not lit.

[Problems that this invention attempts to solve]

The present invention was devised to solve the above conventional problems, and due to some phenomenon in the lighting circuit between the lamp and the battery,
To provide a lighting circuit compensation device for a vehicle, which prevents collisions and the like and ensures safe running of a vehicle by providing a power supply means for instantaneously supplying power to the lamp when the lamp does not turn on. The purpose is to

[Means for solving problems]

A lighting circuit compensation device for a vehicle according to the present invention includes a lighting circuit connected between a lamp and a battery, a switch position detection means interlocked with a lighting switch, and a lighting circuit connected to a connection point between the lighting switch and the lamp. a relay means having a writing circuit detection line and a contact connected in parallel to the writing circuit; the switch position detection means and the writing circuit detection line are connected to an input terminal; and the relay means is connected to an output terminal; It is characterized by comprising a control circuit configured to close a contact of the relay means in response to an input signal from the switch position detection means and the writing circuit detection line due to a conduction failure in the lighting circuit. It is.

〔Example〕

A preferred embodiment of the vehicle lighting circuit compensation device according to the present invention will be described with reference to FIGS. 1 to 4.

The lighting circuit compensator 10 for a vehicle according to this embodiment is connected in parallel to a fuse 3 and a lighting switch 4 in a normal lighting circuit consisting of a battery 2, a fuse 3, a lighting switch 4, and a lamp 1. It is composed of a position detection means 11, a lighting circuit detection line 12, a relay means 13, a vehicle speed detection means 14, and a control circuit 15.

The switch position detection means 11 detects the switch position of the lighting switch 4 and introduces a position signal corresponding to each switch position to an e terminal of a control circuit 15, which will be described later, and detects the switch position. The means 11 includes, for example, a single-throw, two-pole switch 11 that operates in conjunction with the lighting switch 4, as shown in FIG. The switch 11 is in the H side when the lighting switch 4 is in the ON position, and is in the OFF position.
It has an operation mode in which it is on the L side when in the position. In other words, the switch 11 is
When the lighting switch 4 is in the ON position, a high level signal (hereinafter simply referred to as the "H signal") is generated.
Also, when in the OFF position, a low level signal (hereinafter simply referred to as "L signal") is sent to the control circuit 14.
into the e terminal of the

The lighting circuit detection line 12 detects the state of the lighting circuit by extracting a signal at the connection point between the lighting switch 4 and the lamp 1, and the connection point is connected to the d terminal of the control circuit 15. The lighting circuit detection line 12 is connected to the fuse 3 and the lighting switch 4.
is normal, lighting switch 4 is ON.
An H signal is introduced into the d terminal of the control circuit 15 when it is in the OFF position, and an L signal when it is in the OFF position. Further, if an abnormality occurs in the fuse 3 or the lighting switch 4 and it becomes non-conductive, the signal on the lighting circuit detection line 12 becomes an L signal regardless of the switch position of the lighting switch 4.

The relay means 13 is composed of a relay, for example, as shown in FIG. 1, and serves as an opening/closing means. The coil 13a of the relay means 13 has one end connected to the terminal b of the control circuit 15 and the other end connected to the terminal c.
When the coil 13a is energized, the contacts 13b and 13c are turned on, thereby supplying power to the lamp 1.

The vehicle speed detection means 14 measures the vehicle speed, detects whether the vehicle is traveling at a predetermined speed, for example, 10 km/h or more, and sends a vehicle speed signal to the terminal g of the control circuit 15.
It is intended to be introduced to

For example, the vehicle speed detection means 14 may have a circuit configuration as shown in FIG. That is, the vehicle speed detection means 14 includes a vehicle speed detection unit 141 equipped in a speedometer (not shown) and a diode.
_D1 , resistors _R1 to _R5 , capacitors _C1 and _C2 , and a comparator 142. When the vehicle speed exceeds a predetermined speed, an H signal is output from the output section 14a and input to the terminal g of the control circuit 15. do.

The control circuit 15 includes each of the above-mentioned detection means 11, 1.
4 and the lighting circuit detection line 12, and controls the relay means 13 to be operated to supply power to the lamp 1 only when each detection signal meets a predetermined condition.

For example, the internal configuration of the control circuit 15 is shown in FIG. Diodes _D2 to _D7 , Zener diodes
The circuit is composed of electronic elements ZD, resistors R ₆ to R ₁₁ , transistor T, NOT circuit 151 and AND circuits 152 and 153.

The control circuit 15 is configured so that the lighting switch 4
When the lighting circuit between the light 1 and the battery 2 becomes non-conductive while the vehicle is in the ON position and traveling at a speed higher than a predetermined speed, the transistor T is turned on and the coil 13a of the relay means 13 is excited. control as much as possible. By energizing the coil 13a, the contacts 13b and 13c are connected, power is supplied to the lamp 1, and the lamp 1 is kept lit.

The operation of the above-mentioned vehicle lighting compensation device is
This will be explained using the time chart shown in the figure.

First, the operation when the vehicle speed is less than a predetermined vehicle speed, for example, 10 km/h, will be explained.

When the lighting circuit between the battery 2 and the lamp 1 is normal, the lamp 1 is turned on or off as appropriate according to the operation of the lighting switch 4. However, when lamp 1 lights up, fuse 3
When a phenomenon such as disconnection of the wire or non-conduction of the lighting switch 4 occurs, the lamp 1 goes out.
From this state, when the vehicle speed increases above a predetermined value, the output of the vehicle speed detection means 14 becomes an H signal, and the control circuit 1
The output of the AND circuit 153 of No. 5 becomes an H signal and turns on the transistor T. The transistor T
When turned on, the relay means 13 is activated, power is supplied to the lamp 1, and the lamp 1 is turned on. Also, when the vehicle speed is reduced to 10 km/h or less again, vehicle speed detection means 1
The output signal of 4 changes to an L signal and the lamp 1 is turned off. This operation allows the driver to recognize that some phenomenon has occurred in the lighting circuit.

Next, we will explain what happens when an abnormality occurs in the lighting circuit while driving on a general road at night.

As described above, when the lighting circuit is normal, the output signals of each detection means are the H signal from the switch position detection means 11, the H signal from the lighting circuit detection line 12, and the H signal from the vehicle speed detection means 14. AND circuit 152 of control circuit 15
Since one input terminal of the transistor T becomes an L signal, the transistor T is held in an OFF state and the vehicle lighting circuit compensator 10 does not operate.

If a phenomenon such as spontaneous blowing of the fuse 3 or non-conduction of the lighting switch 4 occurs while driving under the above conditions, in other words, if the signal on the lighting circuit detection line 12 becomes an L signal, the AND circuit of the control circuit 15 The output of the AND circuit 152 becomes an H signal, and at the same time, the output of the AND circuit 153 becomes an H signal, turning on the transistor T. That is, if the lamp 1 and the battery 2 become electrically disconnected for some reason, the vehicle lighting circuit compensator instantly operates to supply power to the lamp 1.

In the above embodiment, the signal from the vehicle speed detection means 14 is used to inform the driver of an abnormality in the lighting circuit when driving at low speeds or when the vehicle is stopped, and to prevent consumption of the battery 2. However, the present invention is not limited to the above embodiment. Vehicle speed detection means 1
The same effect can be obtained by adding an alarm indicator that operates when an abnormality occurs in the lighting circuit without using 4.

[Effects of this invention]

The vehicle lighting circuit compensator of the present invention is
A lighting circuit connected between the lamp and the battery, a switch position detection means interlocked with the lighting switch, a lighting circuit detection line connected to a connection point between the lighting switch and the lamp, and a lighting circuit connected in parallel to the lighting circuit. the switch position detection means and the writing circuit detection line are connected to an input terminal, and the relay means is connected to an output terminal, and the switch position detection means and the writing circuit detection line are connected to an input terminal, and the relay means has a contact point that is connected to the switch position detection line due to a conduction failure in the writing circuit. The present invention includes a detection means and a control circuit configured to close the contact of the relay means in response to an input signal from the lighting circuit detection line, so that the lighting circuit becomes non-conductive for some reason during night driving. Even when the relay means closes the contacts, power is instantaneously supplied to the lamp and the lamp is turned on, so collisions and the like can be prevented and safe driving of the vehicle can be ensured.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the vehicle lighting circuit compensation device according to the present invention,
FIG. 1 is a circuit diagram, FIG. 2 is a circuit diagram showing one embodiment of the control circuit, FIG. 3 is a circuit diagram showing one embodiment of the vehicle speed detection means, and FIG. 4 is a time chart explaining the operation. FIG. 5 is a circuit diagram showing the prior art. 1... Lamp, 2... Battery, 3... Fuse, 4... Lighting switch, 10... Vehicle lighting circuit compensator. 11... Switch position detection means, 12... Lighting circuit detection line, 13... Relay means, 14... Vehicle speed detection means, 15... Control circuit.

Claims (1)

[Scope of utility model registration request] A lighting circuit connected between the lamp and the battery, a switch position detection means interlocked with the lighting switch, a lighting circuit detection line connected to a connection point between the lighting switch and the lamp, and a lighting circuit connected in parallel to the lighting circuit. relay means having contacts that are
The switch position detection means and the writing circuit detection line are connected to the input terminal, and the relay means is connected to the output terminal. and a control circuit configured to close a contact of the relay means in response to an input signal of the lighting circuit compensator for a vehicle.