JPS608155Y2 - vehicle speed limiter - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a speed limiting device for a vehicle.

In recent years, administrative guidance has been issued to prevent vehicles with an output exceeding a maximum speed of 180 b/h from exceeding that speed.

Conventionally, as a means to comply with this administrative guidance, a thyristor is provided in parallel to a point contact or a contact breaker inserted in the main ignition circuit, and by controlling this thyristor, thinned ignition is performed.

However, this thyristor required a large capacity, was not only expensive, but also frequently broke down.

The purpose of the present invention is to provide a speed limiting device for vehicles that does not require such large-capacity thyristors or other switching elements. A pulse generator 1 that generates a pulse is connected to a primary coil 4a of an ignition coil 4 via an amplifier 2 and a switching circuit 3, and a secondary coil 4b is connected to spark plugs 9 and 10 of at least two of the multiple cylinders. In the device, the switch element 5
is provided so that the pulse generator 1 is short-circuited when it is turned on, and the output terminal of the low frequency oscillator 7 is connected to the control terminal 5a of the switch element 5 via a gate circuit 8. The gate circuit 8 allows and prohibits the output signal of the low frequency oscillator 7 to pass when the high speed signal is input and when the high speed signal is not input, respectively. The output signal repeatedly turns on the switch element 5,
The switch element 5 is turned off by prohibiting passage of the output signal.

In detail with reference to FIG. 1, both terminals of the output winding 1a of the pulse generator 1 were connected to an amplifier 2, and a thyristor was connected as a switching element 5 between the two terminals.

The amplifier 2 and the switching circuit 3 include a plurality of transistors T.
r3. ...Tr8. Multiple capacitors C1...C6
, a plurality of resistors R9α, .

The vehicle speed detection device 6 is installed in the speedometer and detects whether the vehicle speed is 1
80b/)l, the light-emitting diode Dp, the phototransistor Tr1, and the amplification transistor TR2 face each other through the light-shielding plate 6a and the light-shielding plate 6a.

The low frequency oscillator 7 consists of an astable multivibrator consisting of two transistors Tr3°Tr.

The gate circuit 8 includes a diode D□ connected to the collector of the transistor Tr2 of the vehicle speed detection device 6 and a diode D connected to the collector of the transistor Tr of the low frequency oscillator 7.
2, both diodes D1. The anodes of D2 were commonly connected to the bases of the amplification transistors Tr.

The gate circuit 8 controls the low frequency oscillator 7 and the switching element 5 by connecting the collector of the transistor Tr9 to the control terminal 5a of the switching element 5 made of the thyristor and connecting the diode D2 to the output terminal of the low frequency oscillator 7. It is connected between the terminals 5a and connected to the output terminal of the vehicle speed detection device 6, and is turned OFF when a non-high speed signal of rH, which is output from the output terminal of the vehicle speed detection device 6, is input, and the low frequency oscillator is activated. The output of the collector of the transistor Tr9 on the output side is set to 1L, and the switch element 5 is turned off. When the high-speed signal rLJ is input, it is turned on and the low frequency signal of the low frequency oscillator 7 is turned off. Passing the frequency signal, HJ and rL from the collector of transistor Tr9,
The signals are output alternately, and the switch element 5 is repeatedly turned on.
I turned it off.

The embodiment shown in FIG. 1 is suitable for a four-cylinder engine, and as described above, the secondary coil 4b of the ignition coil 4 is connected to the spark plugs 9, 10 of the second and third cylinders, and the The spark plug of the fourth cylinder is connected to another ignition circuit (not shown).

Now, when the power is turned on to each circuit shown in FIG. 1 and driving is started and the vehicle speed is below 180 b/h, the light shielding plate 6a in the vehicle speed detecting device 6 is in the advanced state and is shielded from light. The phototransistor Tr□ has a high impedance, and the transistor Tr2 is in an OFF state, and a non-high-speed signal with a power supply voltage of 12V [hereinafter referred to as H] is generated at its collector, which is transmitted to the transistor Tr9 via the diode D1 of the gate circuit 8. join and turn it on.

Its collector is thus at a low voltage, keeping the switch element 5 made of Cyrisk OFF.

Thus, the pulses generated by the pulse generator 1 are applied to the amplifier 2, which turns on the transistor Tr6, turns off the transistor Tr7, and so on. Controlling the current on the primary coil 4a side of the ignition coil 4 by turning Tr8 OFF and ONL to generate a high voltage in the secondary coil 4b is repeated.
The spark plugs 9 and 10 of the third cylinder are ignited.

On the other hand, the spark plugs of the first and fourth cylinders are ignited by the other ignition circuits mentioned above, and the vehicle is driven.

Next, when the vehicle speed becomes 180b/H or higher, the light shielding plate 6a of the vehicle speed detection device 6 retreats, the phototransistor Tr1 receives light and becomes low impedance, the transistor Tr2 is turned on, and a high-speed signal of rLJ is generated from its collector. do.

On the other hand, since the low frequency oscillator 7 continues to oscillate, "H, LJ"
are alternately and repeatedly output, and the gate circuit 8 is turned on by the high-speed signal, so that the transistor Tr,
Turn on and off intermittently.

Thus, when the transistor Tr is turned off, 1HJ is generated at its collector, which is applied to the control terminal 55a of the switching element 5 made of Cyrisk, turning it on, so that the output terminal of the pulse generator 1 is short-circuited and then Since the generated pulses are not applied to the amplifier 2, the ignition of the ignition flags 9, 10 of the second and third cylinders is stopped.

Next, when the transistor Tr9 is turned on, its collector becomes 1L, the switch element 5 is turned off, the output pulse of the pulse generator 1 is applied to the amplifier 2, and the spark plugs 9 and 10 are ignited, which is repeated.

In this embodiment, the oscillation frequency of the low frequency oscillator 7 is set to about 20 Hz so that the switch element 5 is turned on and off every three pulses of the output pulse of the pulse generator 1, as shown in FIG. 2, c and d. It was set to

Then, the spark plugs of the first and fourth cylinders continue to ignite as shown in FIG. 2a.

Thus, by thinning out the ignition of the second and third spark plugs 9 and 10, the output of the internal combustion engine decreases to 180m/
The speed will be suppressed to below H.

3A...E show other embodiments of the switch element 5, and FIG. 3A shows the output winding 1 of the pulse generator 1.
A relay switch is connected in parallel to a, and the relay coil 5b has its control terminal 5a connected to the collector of the transistor Tr9, and the other end connected to the ground, and the 'H,
Turn contact 5C ON and OFF using LJ.

FIG. 3B shows a case where transistors are connected in parallel.

Figure 3C shows a case where a thyristor is connected between one end of the output winding and the ground, and the third figure shows a case where a transistor is connected in the same way as in Figure 3C.

FIG. 3E shows a case in which a relay switch is connected in series with the circuit connecting the output winding 1a to the amplifier 2.

In this way, according to the present invention, the pulse generator 1
The switch element 5 is connected to the circuit connecting the pulse generator 1 to the amplifier 2 so as to short-circuit the pulse generator 1, and the switch element 5 is controlled according to the output of the vehicle speed detection device 6. A small and small capacitance device is sufficient, which makes it inexpensive and prevents breakdown. Furthermore, the output terminal of the low frequency oscillator 7 is connected to the control terminal 5a of the switching element 5 via the gate circuit 8, and the gate circuit 8 Connect the output terminal of the vehicle speed detection device 6 to
Since the NJ'0FFJ is designed to repeat ignition and misfire for a predetermined time at a predetermined speed or higher, the circuit configuration is relatively simple, and rapid engine braking is not applied, so there is no engine shock or fatigue. Low frequency oscillator 7
are pulse generator 1 and amplifier 2 through which a small amount of current flows.
Since the oscillation period is not affected by the on/off state of the switching element 5 and will not become irregular since it controls the switching element 5 that intervenes in the connection circuit with the This has the advantage that no vibration is generated, so the ride feeling is not impaired, and the engine is less fatigued and the occurrence of failures is extremely reduced.

Furthermore, since it thins out the ignition of at least two cylinders out of four or more cylinders, compared to a method that thins out the ignition of the golden cylinders, the engine brake does not work too much than necessary and smooth deceleration can be achieved. has.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of an example of implementing the present invention, Figure 2 a...
d is an explanatory diagram of its operation, and FIGS. 3A to 3E are circuit diagrams showing other embodiments of the switch element. 1...Pulse generator, 2...Amplifier, 3...Switching circuit, 4...
・Ignition coil, 4a...-Next coil, 5...Switch element, 5a...Control terminal, 6...Vehicle speed detection device, 7... ...Low frequency oscillator, 8...Gate circuit.

Claims (1)

[Scope of utility model registration request] A pulse generator 1 that generates ignition pulses in synchronization with the rotation of a multi-cylinder internal combustion engine of four or more cylinders is connected to an ignition coil 4 via an amplifier 2 and a switching circuit 3.
In the device in which the primary coil 4a is connected to the secondary coil 4b and the secondary coil 4b is connected to the spark plugs 9 and 10 of at least two of the multiple cylinders, the switch element 5 is configured to short-circuit the pulse generator 1 when the switch element 5 is turned on. The output terminal of the low frequency oscillator 7 is connected to the control terminal 5a of the switch element 5 via a gate circuit 8.
An output terminal of a vehicle speed detection device 6 that generates a high-speed signal at a predetermined high speed of the vehicle is connected to the gate circuit 8, and the gate circuit 8 passes the output signal of the low-frequency oscillator 7 when the high-speed signal is input and when the high-speed signal is not input. A speed limiting device for a vehicle, characterized in that the switch element 5 is repeatedly turned on and off by the output signal, and the switch element 5 is turned off by prohibiting the passage of the output signal.