JPH0640526Y2 - Headlight control device for motorcycle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a motorcycle headlight control device for controlling a headlight of a motorcycle.

[Prior Art] In recent years, in order to improve safety in motorcycles, headlights have come to be turned on not only when driving at night but also when driving during daytime.

However, conventionally, the turning on / off of the headlights of the motorcycle depended only on the operation switch operated by the driver, so that the headlights were often kept on not only when the vehicle was running but also when the vehicle was stopped.

For this reason, the headlights that consume a large amount of power consume a significant amount of time, and the battery installed in the motorcycle generally has a small capacity. There was a problem that the operating igniter stopped operating and the engine could not be started.

Also, for example, at the time of a stop at a red traffic light,
There was a problem that an oncoming vehicle would be dazzled if the headlights were kept on.

Further, since a device for solving such a problem is used by being attached to an existing motorcycle, it is required that the device be easily attached.

[Problems to be Solved by the Invention] The present invention has been made in view of the above circumstances. It is possible to prevent wasteful consumption of a battery without performing a special operation and to prevent glare from oncoming vehicles. In addition, the present invention is intended to provide a headlight control device for a motorcycle, which can be easily mounted on an existing motorcycle and has a simple structure and is inexpensive.

[Means for Solving the Problems] In order to solve the problems described above, the present invention provides (a) an antenna for electromagnetically inducing an ignition pulse of an engine of a motorcycle, and (b) a pulse current electromagnetically induced in the antenna. A detection circuit for detecting, a first diode having an anode connected to ground and a cathode connected to one end of the antenna, and an anode connected to a cathode of the first diode and a cathode having a power supply voltage. Connected to the second diode, a first resistor having one end connected to the cathode of the first diode, and a second resistor connected between the other end of the first resistor and the power supply voltage. Resistor, a third resistor connected between the other end of the first resistor and ground, an anode connected to ground, and a cathode connected to the first resistor. A detection circuit including a third diode connected to the other end of the resistance, and (c) a waveform shaping circuit for shaping the detection output of the detection circuit into a square wave, wherein the first input section is A first NAND gate connected to the cathode of the third diode; an output connected to a second input of the first NAND gate and a first input connected to the output of the first NAND gate. A second NAND gate connected to the second NAND gate, and a fourth resistor connected between the output of the second NAND gate and the second input of the second NAND gate,
A waveform shaping circuit including a first capacitor connected between the second input of the second NAND gate and ground; and (d) a square wave output from the waveform shaping circuit having a frequency equal to that of the square wave. F-V to convert to the voltage of the level corresponding to
A conversion circuit, a fifth resistor connected between the output of the waveform shaping circuit and ground, a second capacitor having one end connected to the output of the waveform shaping circuit, and a second capacitor
F-V conversion circuit including a third capacitor connected between the other end of the capacitor and the ground, and (e) the F
And a light-off means for automatically turning off the headlight of the motorcycle when the voltage level from the -V conversion circuit is equal to or lower than the voltage level corresponding to a predetermined rotation speed higher than the idle rotation speed of the engine. It was done.

[Operation] According to the present invention, the number of revolutions of the engine of the motorcycle is detected as a voltage level by the antenna, the detection circuit, the waveform shaping circuit, and the FV conversion circuit,
When the voltage level is equal to or lower than the voltage level corresponding to a predetermined rotation speed higher than the idle rotation speed of the engine, the headlight of the motorcycle is automatically turned off by the light-off means, and the motorcycle cycle is eventually ended. When the number of revolutions of the engine is equal to or lower than a predetermined number of revolutions higher than the idling number of revolutions, the headlight is automatically turned off.

Therefore, in the motorcycle, the engine speed drops to the idle speed when the motorcycle is stopped, and the headlight is automatically turned off when the motorcycle is stopped.

The operation of the present invention outlined above is specifically as follows.

First, in a state where the ignition pulse is not electromagnetically induced in the antenna, the cathode of the third diode (that is, the first input portion of the first NAND gate) is generated by the voltage division ratio of the second resistor and the third resistor. ) Is at a high level. Further, in this state, the output section of the first NAND gate (that is, the first input section of the second NAND gate) is at the low level, and the output section of the second NAND gate (that is, the first NAND gate). Second input section) of the second NAND gate is at a high level, and the second input section of the second NAND gate is at a high level. Next, when the ignition pulse is electromagnetically induced in the antenna in this initial state, the cathode of the third diode (that is, the first input portion of the first NAND gate) becomes low level. As a result, the output of the first NAND gate (ie, the first input of the second NAND gate).
Changes from low to high, the output of the second NAND gate (ie, the second input of the first NAND gate) changes from high to low, and the second input of the second NAND gate changes , And gradually decreases from high level to low level according to the time constant determined by the fourth resistor and the first capacitor. In addition, when the ignition pulse is electromagnetically induced to the antenna,
A negative voltage (reverse voltage) is about to develop at the first input of the first NAND gate, but the third diode limits the level of the reverse voltage so that the first NAND gate is not damaged. Protected against reverse voltage.
Since the ignition pulse is generated for a short period of time, the cathode of the third diode (that is, the first input portion of the first NAND gate) must be connected before the second input portion of the second NAND gate reaches the low level. It has returned to the high level. When the second input section of the second NAND gate reaches the low level, the output section of the second NAND gate (that is, the second input section of the first NAND gate) changes from the low level to the high level, The output of the first NAND gate (ie, the first input of the second NAND gate) changes from a high level to a low level, and the second input of the second NAND gate has a fourth resistor and a first capacitor. It gradually rises from the low level to the high level according to the time constant determined by. Then, when the second input section of the second NAND gate completely returns to the original high level, it returns to the initial state described above. The time constant of the fourth resistor and the first capacitor is set so as to return to the above-mentioned initial state before the next ignition pulse is generated.

In this way, at the output of the first NAND gate, a square wave having a predetermined high level for a certain period of time determined by the time constant of the fourth resistor and the first capacitor from the time of generation of the ignition pulse is obtained, After all, a square wave having a constant pulse width generated at a frequency corresponding to the engine speed is obtained.

Then, this square wave is charged and discharged by the fifth resistor, the second capacitor and the third capacitor, and the voltage of the level corresponding to the frequency of the square wave is generated between the second capacitor and the third capacitor. According to the voltage level, the extinguishing means extinguishes the headlight, so that the headlight is automatically extinguished when the motorcycle is stopped.

[Embodiment] Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 is an electric circuit diagram showing an embodiment of the present invention.

In the figure, (1) is a rotation speed detecting means for detecting the rotation speed of an engine (not shown) of the motorcycle, and (2) is a headlight of the motorcycle. Also,
(3) is a headlight of the motorcycle when the voltage level as the detection signal of the rotation speed detection means (1) is equal to or lower than the voltage level Vp corresponding to a predetermined rotation speed Np higher than the idle rotation speed Na of the engine. It is an extinguishing means for extinguishing (2).

In the case of the embodiment shown in the drawings, the rotation speed detecting means (1) is constructed as follows.

That is, in FIG. 1, (4) is an antenna for electromagnetically inducing the ignition pulse of the engine, which is installed close to an ignition system such as an engine ignition plug or an ignition plug cable.

The cathode of the first diode (6) is connected to one end of the antenna (4), and the first diode (6) is connected.
The anode of is connected to ground. The cathode of the first diode (6) is connected to the anode of the second diode (5), and the cathode of the second diode (5) is connected to the power supply voltage (in this embodiment, the positive electrode of the battery) + B. ing. Further, one end of the first resistor (8) is connected to the cathode of the first diode (6), and the second resistor (9) is provided between the other end of the first resistor (8) and the power supply voltage + B. )
Are connected. A third resistor (10) is connected between the other end of the first resistor (8) and the ground. The cathode of the third diode (7) is connected to the other end of the first resistor (8), and the anode of the third diode (7) is connected to the ground. The diodes (6) (5) (7) and resistors (8) (9)
(10) constitutes a detection circuit for detecting the pulse current electromagnetically induced in the antenna (4).

Further, the first input part of the first NAND gate (12) is connected to the cathode of the third diode (7).
The output part and the first input part of the second NAND gate (13) are connected to the second input part and the output part of the first NAND gate (12), respectively. Second NAND gate (1
A fourth resistor (11) is connected between the output of 3) and the second input of the second NAND gate (13). A first capacitor (16) is connected between the second input section of the second NAND gate (13) and the ground. Further, in the figure, (14) and (15) are NAND gates. The NAND gates (12) (13) (14) (15), the resistor (11) and the capacitor (16) waveform the detection output of the detection circuit (cathode voltage of the third diode (7)) into a square wave. It constitutes a waveform shaping circuit for shaping. The NAND gates (12) (13), the resistor (11) and the capacitor (16)
Form an RS flip-flop.

Further, a fifth resistor (17) is provided between the output of the NAND gate (15) which is the output of the waveform shaping circuit and the ground.
Are connected. Further, one end of the second capacitor (18) is connected to the output part of the NAND gate (15). The third capacitor (19) is connected between the other end of the second capacitor (18) and the ground. The resistor (17) and the capacitors (18) and (19) form an FV conversion circuit that converts the square wave output from the waveform shaping circuit into a voltage of a level corresponding to the frequency.

Therefore, according to the rotation speed detection means (1) shown in the first figure, the ignition pulse of the engine, that is, the signal of the frequency corresponding to the rotation speed of the engine is transmitted to the antenna 4
And the signal is shaped into a square wave having a predetermined pulse width by the waveform shaping circuit. Therefore, from the output of the waveform shaping circuit, that is, the output of the NAND gate (15), a square wave signal having a predetermined pulse width having a frequency corresponding to the engine speed can be obtained. Then, this square wave signal is F-
Frequency-voltage conversion is performed by the V conversion circuit, and as a result, as the output of the F-V conversion circuit, from the connection midpoint A between the capacitor (18) and the capacitor (19), the voltage level corresponding to the engine speed. Is obtained. The relationship between the engine speed and the voltage level at the connection midpoint A (output of the FV conversion circuit) is shown in FIG.

Further, in the case of the embodiment shown in the drawings, the extinguishing means (3) is
A resistor (20), a transistor (21) and a relay (22) are connected as shown in the figure. In FIG. 1, (22a) is a coil portion of the relay (22), and (22b) is a contact of the relay (22). The contact (22b) closes when the coil portion (22a) is energized and opens when the coil portion (22a) is not energized.
The transistor (21) is rendered non-conductive when the voltage at the connection midpoint A is equal to or lower than a predetermined level Vp, and is rendered conductive when the voltage is higher than the predetermined level Vp. The predetermined level Vp is higher than the idle speed Na (eg, about 1500 rpm) by a predetermined speed Np (eg, about 300) in relation to the characteristic shown in the second diagram.
0 rpm) is set. The predetermined rotation speed Np is set to be always lower than the rotation speed during traveling. In FIG. 2, Va indicates the voltage level at the connection midpoint A corresponding to the idle speed Na.

Therefore, according to the extinguishing means (3) shown in FIG. 1, when the voltage at the connection midpoint A, which is the detection signal of the rotation speed detecting means (1), is received and the voltage is below a predetermined level Vp, the transistor (21 ) Becomes non-conductive, and as a result, the coil portion (22a) is not energized, the contact (22b) is opened, and the headlight (2) is turned off. on the other hand,
When the voltage at the connection midpoint A is higher than the predetermined level Vp, that is, when the engine speed is higher than the predetermined speed Np, the transistor (21) becomes conductive, and as a result,
The coil portion (22a) is energized, the contact (22b) is closed, and the headlight (2) can be turned on.

In FIG. 1, (23) is a holding type headlight operation switch operated by the driver.

According to the headlight control device of the present invention having the above-described configuration, when the motorcycle is running, the engine speed is higher than the predetermined speed Np, so that the voltage at the connection midpoint A is higher than the predetermined level Vp. It has become larger, and the transistor (21) has become conductive, and the relay (2
The contact (22b) of 2) is closed. Therefore, if the driver keeps the headlight operation switch (23) closed during traveling, the headlight (2) is turned on via the contact (22b) of the headlight operation switch (23) and the relay (22). The headlight (2) is energized, the headlight (2) is turned on, and so-called writing traveling can be performed.

When the motorcycle stops, the engine speed drops to the idle speed Na, so the voltage at the connection midpoint A drops to Va and drops below a predetermined level Vp.
The transistor (21) becomes non-conductive and the relay (22)
The contact (22b) is opened, and the headlight (2) is automatically turned off.

In this way, when the motorcycle is stopped, the headlight (2) that consumes a large amount of power is automatically extinguished, so that it is possible to prevent wasteful drainage of the battery without performing a special operation, and However, it can be said that the battery can be charged to such an extent that the insufficient charging of the battery is resolved.

Further, as described above, since the headlight (2) is automatically turned off when the motorcycle is stopped, it is possible to prevent the oncoming vehicle from being dazzled without performing a special operation.
Good for traffic safety.

Further, since the antenna, the detection circuit, the waveform shaping circuit, and the FV conversion circuit are used as means for detecting the number of revolutions of the engine of the motorcycle as a voltage level, it is attached to an existing motorcycle. In that case, the antenna may be installed close to an ignition system such as an engine spark plug or a spark plug cable,
There is no need to make an electrical connection to an ignition device or the like. Therefore, according to the present invention, it can be easily attached to an existing motorcycle.

Further, the detection circuit, the wave shaping circuit, and the F-V
Since the conversion circuit is composed of the diode, the resistor, the capacitor, and the NAND gate as described above, the structure is simple and inexpensive.

In the present invention, the headlight (2) is automatically turned off, but the tail lamp of the motorcycle may be automatically turned off at the same time, or the tail lamp may not be turned off at the same time. .

[Advantages of the Invention] According to the present invention, it is possible to prevent useless consumption of the battery and perform antiglare oncoming vehicles without performing a special operation.

Further, since the antenna, the detection circuit, the waveform shaping circuit, and the FV conversion circuit are used as means for detecting the number of revolutions of the engine of the motorcycle as a voltage level, it is attached to an existing motorcycle. In this case, the antenna may be installed close to an ignition system such as an engine spark plug or a spark plug cable, and it is not necessary to electrically connect it to an ignition device or the like. Therefore, according to the present invention, it is possible to easily attach the motorcycle to an existing motorcycle.

Further, the detection circuit, the waveform shaping circuit, and the F-
Since the V conversion circuit is composed of the diode, the capacitor, and the NAND gate, the present invention has an effect that the structure is simple and the cost is low.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing an embodiment of the present invention, and FIG. 2 is a rotational speed-voltage characteristic diagram at point A in FIG. (1) ... Rotational speed detection means, (2) ... Headlight,
(3) …… Light-out means.

Claims (1)

[Scope of utility model registration request] 1. An antenna for electromagnetically inducing an ignition pulse of a motorcycle engine, and a detection circuit for detecting a pulse current electromagnetically induced in the antenna, wherein an anode is connected to ground and a cathode is at one end of the antenna. A first diode connected to the first diode, a second diode having an anode connected to the cathode of the first diode and a cathode connected to the power supply voltage, and one end connected to the cathode of the first diode. A first resistor, a second resistor connected between the other end of the first resistor and the power supply voltage, and a second resistor connected between the other end of the first resistor and the ground. A detector circuit comprising a third resistor and a third diode having an anode connected to ground and a cathode connected to the other end of the first resistor; A waveform shaping circuit for shaping the detection output of a detection circuit into a square wave, the first input gate having a first input connected to the cathode of the third diode, and the output having the first NAND gate. A second NAND gate connected to a second input section of the first NAND gate and a first input section connected to an output section of the first NAND gate, and the output section and the second NAND gate of the second NAND gate. Second
A waveform shaping circuit including a fourth resistor connected between the second NAND gate and a second capacitor, and a first capacitor connected between the second input of the second NAND gate and ground. An FV conversion circuit for converting a square wave output from the waveform shaping circuit into a voltage of a level corresponding to the frequency, which is a fifth FV conversion circuit connected between an output portion of the waveform shaping circuit and ground. An F-V including a resistor, a second capacitor having one end connected to the output of the waveform shaping circuit, and a third capacitor connected between the other end of the second capacitor and the ground. A conversion circuit, and an extinguishing means for automatically extinguishing the headlight of the motorcycle when the voltage level from the FV conversion circuit is equal to or lower than the voltage level corresponding to a predetermined rotation speed higher than the idle rotation speed of the engine. Is equipped with DOO headlight control apparatus for a motor cycle according to claim.