JP2764188B2 - Speed limiter for vehicles - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle speed limiting device that limits the speed of a motorcycle or the like so as not to exceed a predetermined speed limit.

(Background technology)

As countermeasures against vehicle speed regulation, various engine overspeed prevention devices have been proposed in which the engine ignition timing is controlled to suppress the number of revolutions below a certain value. In the conventional engine overspeed prevention device, only when the shifted gear position is the top gear, the ignition is controlled so as not to exceed the speed limit corresponding to the speed limit when traveling in the shifted top gear. I was In this case, since the speed limit is set relatively low, for example, 50 [km / h], the fifth speed limit is set.
Engine speed when shifting to 6350
Even if it is limited to [rpm], 7450 [rpm] in 4th speed, and 3rd speed
If it is 9500 [rpm], traveling exceeding the speed of 50 [km / h] will be possible, but it is easy to reach these rotation speeds due to the performance of the engine. There was an inconvenience that the function was not performed.

In order to solve such a problem, various proposals have been made to detect the gear position and the number of revolutions of the engine and to perform ignition control at the number of revolutions of the engine reaching a speed limit set for each gear position. For example,
59-184336 and JP-A-59-231173.

According to the invention described in these publications, a gear position sensor (switch) provided on one end face of the shift cam is provided with R ₁ at the _first to third speeds, R ₂ at the fourth speed, and R at the fifth speed. 6 in ₃
By connecting a resistance that becomes ∞ (open) in speed and neutral, a change in the sensor potential is detected and the number of rotations at which a misfire occurs at each gear position (third speed is the fourth speed)
(The speed is set higher than the fifth speed and the fourth speed is set higher than the fifth speed).

[Problems to be solved by the invention]

However, recently, a resistor R1 for the _first to third speeds is always connected in place of the gear position sensor so that, for example, a misfire does not occur at the fifth speed until the engine speed limit at the third speed is reached. Modified parts called "race kits" that release the above speed limit due to
It has become a social problem.

[Object of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a speed limiting device for a vehicle which can solve the inconvenience of the conventional example and can almost completely prevent a modification for releasing a speed limit by a speed limit releasing kit such as a "race kit". It is in.

[Means for solving the problem]

According to the present invention, an ignition capacitor that is charged by an electromotive force generated in a capacitor charging coil of a magneto in synchronization with rotation of an engine, and a charge stored in the ignition capacitor is converted into a primary coil of an ignition coil in accordance with an ignition signal. A CDI ignition unit is provided having a semiconductor switching element for causing discharge through the CDI. Also, a rotation detection circuit for detecting the rotation speed of the engine and outputting a voltage corresponding thereto, and a capacitor for turning on the misfire thyristor when the output of the rotation detection circuit reaches a value corresponding to a predetermined limit rotation speed. A rotation speed control circuit for releasing the output from the charging coil is provided. Furthermore, a gear shift switch for detecting the current gear position,
A control speed setting resistor including a control speed setting resistor having a resistance value determined in advance corresponding to each gear position, and selecting a control speed setting resistor according to a gear position detected by a gear shift switch; A gear position control unit for setting the rotation speed limit is provided. An open-potential detection circuit is interposed between the rotation detection circuit and the misfire thyristor. The open-potential detection circuit receives an output of the rotation detection circuit, and the engine speed is controlled by a rotation speed limit of the rotation speed control circuit. A first function unit that outputs a misfire signal to the misfire thyristor when a limit release prevention rotation speed set to a value lower than the number is reached, and an open potential appearing between gear positions of the gear shift switch or at a neutral position is detected. In this case, the second function unit cancels the misfire signal output function of the first function unit. This aims to achieve the above-mentioned object.

(Example of the invention)

An embodiment of the present invention will be described below with reference to FIGS.

The embodiment shown in FIG. 1 includes a capacitor charging coil 2 of a magneto 1 for generating an electromotive force in synchronization with the rotation of an engine, a CDI ignition unit 3 connected to the capacitor charging coil 2, and a CDI ignition unit. And a gear position control unit 30 that detects the current gear position that is shifted and sets a limit rotational speed of a rotational speed control circuit, which will be described later, according to the detected gear position. It has.

The CDI ignition unit 3 includes a rectifier circuit 4 for rectifying the electromotive force generated in the capacitor charging coil 2,
One end is connected to the output side of the ignition coil 5 and the other end is grounded via the primary coil 5a of the ignition coil 5. The anode is connected between the rectifier circuit 4 and the ignition capacitor 6 and the cathode is connected. A thyristor 7 for ignition as a semiconductor switching element,
The ignition thyristor 7 includes a trigger circuit 8 whose output side is connected to the gate of the thyristor 7. Further, one end of a spark plug 12 is connected to the secondary coil 5b of the ignition coil 5, and the other end of the spark plug 12 is grounded.

The rectifier circuit 4 includes a thyristor 4A having an anode connected to the capacitor charging coil 2 and a cathode connected to the ignition capacitor 6, and a thyristor 4A.
4A and a diode 4B connected in parallel via resistors 9 and 10. The trigger circuit 8 is a circuit having one end connected to the output line of the capacitor charging coil 2 and outputting an ignition signal as a control signal to the gate of the ignition thyristor 7 at a predetermined timing according to the output of the capacitor charging coil 2. A diode is connected in parallel with the ignition coil 5 on the other end side (ignition coil 5 side) of the ignition capacitor 6.
11 is connected.

Here, the operation of the CDI ignition unit 3 will be briefly described. When an unillustrated rotor of the magnet 1 rotates and an alternating current is generated in the capacitor charging coil 2, the alternating current is rectified by the rectifying circuit 4. In this case, the alternating current generated in the capacitor charging coil 2 is connected to the diode 4B via the resistor 9.
The gate current flows through the thyristor 4A due to the current passing through the diode 4B, and conduction between the cathode and the anode of the thyristor 4A activates the thyristor 4A. Thus, the alternating current is rectified by the thyristor 4A. The rectified current charges the ignition capacitor 6.

On the other hand, the trigger circuit 8 inputs an ignition signal to the gate of the ignition thyristor 7 based on the output of the capacitor charging coil 2 by the rotation of the rotor. As a result, the cathode and anode of the ignition thyristor 7 conduct, and the ignition capacitor 6 discharges through the ignition thyristor 7 and the primary coil 5a of the ignition coil 5. The rapid current change of the primary coil 5a induces a fast rising high voltage in the secondary coil 5b. Due to this high voltage, an electric spark jumps between the electrodes of the ignition plug 12 to ignite. When the discharge is completed, the thyristor 7 is turned off, and the ignition capacitor 6 is turned off.
Is charged again. This charging and discharging is performed in a very short time.

 Next, the configuration of the control unit 20 will be described.

The control unit 20 includes a battery 21 as a power supply, a power supply circuit 23 connected to the plus side of the battery 21 via a switch 22, a battery drop detection circuit 24 connected in series to the power supply circuit 23, A rotation detection circuit 25 whose input side is connected to the output line of the capacitor charging coil 2, a first comparator 26 as a rotation speed control circuit whose negative side input terminal is connected to the output side of the rotation detection circuit 25, One end of the input side is connected to the output side of the rotation detection circuit 25, and the other end of the input side is connected to the point A between the power supply circuit 23 and the battery drop detection circuit 24 via the resistor 12. Open potential detection circuit 27, battery drop detection circuit 24, first
And a misfire thyristor 16 whose gate is connected via diodes 13, 14, 15 respectively connected to the output stage of the comparator 26 and the open potential detection circuit 27.

Among them, the rotation detection circuit 25 includes the capacitor charging coil 2
, And detects the rotation speed of an engine (not shown), and accordingly generates a higher output voltage as the rotation speed is lower. That is, the rotation detection circuit 25 is a circuit in which the output voltage gradually decreases when the output of the capacitor charging coil 2 increases (the generated AC frequency increases) as the engine speed increases. The first comparator 26 has a positive input terminal connected to the low potential side of the resistor 12 and a point C shown in the figure determined by the resistor 12 and the limiting speed setting resistors R ₁ , R ₂ and R ₃ described later. Is compared with the output of the rotation detection circuit 25, and outputs a "high (H)" level signal when the potential at point C is higher. The misfire thyristor 16 has an anode connected to the gate of the thyristor 4A described above and a cathode grounded. For this reason, the battery drop detection circuit 24 and the first comparator 26
When any one of the outputs of the open potential detection circuit 27 becomes "H" level, a gate current flows to the misfire thyristor 16 to short-circuit the gate signal of the thyristor 4A, so that the output of the capacitor charging coil 2 is opened. It has become.

The open potential detection circuit 27 receives the output of the rotation detection circuit 25, and the engine speed reaches the limit release prevention speed set lower than the limit speed of the first comparator 26 set by the gear position control unit 30. First functional unit 27A that outputs a misfire signal to thyristor 16 for misfire
And a second function unit 27B that cancels the misfire signal output function of the first function unit 27A when an open potential that appears between each gear position of the gear shift switch described later or at the time of the neutral position is detected. ing.

More specifically, the first functional unit 27A includes a second comparator 28 and resistors 17, 32, and 33.
The negative input terminal of the second comparator 28 is connected between the rotation detection circuit 25 and the negative input terminal of the first comparator 26, and the positive input terminal of the second comparator 28 includes resistors 17 and 18. It is connected to a point D shown in the figure between the power supply circuit 23 and the battery drop detection circuit 24 through the power supply circuit 23. The output terminal of the second comparator 28 is connected via a diode 19 to the anode of the diode 15 described above.

The second functional unit 27B includes a third comparator 29 and a resistor 3
5, 36, 37, and 39, and a diode 38 and a thyristor 31. The positive input terminal of the third comparator 29 is connected to the point B via the diode 34 and the point B shown in the figure, and the negative input terminal of the third comparator 29 is connected to the resistor 35.
Grounded through. One end of a resistor 36 is connected to the high potential side of the resistor 35. The other end of the resistor 36 is connected to the resistor 17 connected to the second comparator 28 described above.
Is connected to the high-potential side. Further, a resistor 37 is provided in parallel with the resistor 36, and the low potential side of the resistor 37 is connected between the anode of the diode 34 and the positive input terminal of the third comparator 29. On the other hand, the output terminal of the third comparator 29 is connected to a thyristor through a diode 38.
Connected to 31 gates. The anode of the thyristor 31 is connected to the cathode of the diode 19 described above. The cathode of the thyristor 31 is grounded. Further, the gate of the thyristor 31 is grounded via the resistor 39.

Here, the first functional unit of the open potential detection circuit 27
The functions of the second and third comparators 28 and 29 constituting the second function unit 27A and the second function unit 27B will be described.

The third comparator 29 has a potential V ₁ at the negative input terminal.
The potential of the positive input terminal, that is, compares the potential V ₂ at point B, V _2> in the case of V _1, and outputs "H" level signal, the second comparator 28 caused to conduct thyristor 31 Has the function of short-circuiting (falling to the ground) the misfire signal which is the output signal of. The second comparator 28 compares the potential V of the negative input terminal which is determined by the output of the reference potential V _{0 which} is the potential of the positive input terminal rotation detecting circuit 25, in the case of V _0> V, " It has a function of outputting an "H" level signal (misfire signal). Here, the reference potential V ₀ is determined by the output of the rotation detection circuit 25 when the engine speed is 5000 [rpm], which is the limit release prevention speed, when a limit speed setting resistor R ₁ described later is connected. Is set to have a potential substantially equal to the value of.

The gear position control unit 30 is connected to the positive input terminal of the first comparator 26 via the points B and C, and is connected to a limit rotation speed setting resistor (hereinafter, referred to as a “resistance” as necessary) R ₁ . R ₂ , R _3, and a gear shift switch 40 provided in parallel with these resistors R ₁ , R ₂ , R ₃ .

The gear shift switch 40 is actually a contact 44 which is inserted into a concave portion 42a provided on one end surface of the gear shift cam 42 and urged outward by a spring 43, as shown in FIGS. And a gear shift switch main body 41 mounted opposite to one end face of the gear shift cam 42.
"Neutral", "first speed", "second speed"
Speed ”,“ third speed ”. Terminals (fixed contacts) T _{0 to} T ₅ corresponding to “fourth speed” and “fifth speed”, respectively. Each terminal T ₀ through T ₅ are, 4 (1),
As shown in (2), it is arranged in the gear shift switch main body 41. That is, the terminals T _{1 to} T ₅ corresponding to the _first to fifth speeds are arranged on the same circumference at approximately 60 ° intervals. Further, terminal T ₀ corresponding to the neutral is disposed between the terminal T ₁ and T _2. Terminals T ₁ , T ₂ and T ₃ are connected to the aforementioned resistor R ₁ , and terminals T ₄ and T ₅ are connected to resistors R ₂ and R ₃ , respectively. The other end of the terminal T ₀ is open. The other end of the resistor R _1, R _2, terminal R ₃ is connected T ₁ through T ₅ is connected via the lead wire to the point B in FIG. 1 described above.

Here, the operation of the gear shift switch 40 configured as described above will be described.

When the gear shift cam 42 is rotated in order to change the gear, the contact 44 also rotates, and a terminal corresponding to the gear position is selected, and the terminal contacts the contact 44. In this case, the terminal T ₁ corresponding to any of the first to third speeds
When the through T ₃ is selected, the resistance R ₁ is connected to a point B in FIG. 1, the low potential side is grounded via a contact 44. Similarly, when the terminals T ₄ and T ₅ corresponding to the fourth speed and the fifth speed are selected, the resistors R ₂ and R ₃ are respectively connected to the point B in FIG. Grounded through contact 44. There is a relationship of R ₁ <R ₂ <R ₃ among these resistors R ₁ , R ₂ and R ₃ .

The potential V ₂ of the first B point is positive side voltage of the comparator in this case is shown in Figure 5.

As shown in FIG. 5, the neutral time becomes V ₂ = open potential, also once V ₂ = open potential even between each gear is adapted to be detected.

 Next, the overall operation and operation of this embodiment will be described.

First, in normal times, when the gear is set to neutral and the kick lever (not shown) is operated to rotate the engine, the rotor (not shown) of the magnet 1 rotates and an alternating current is generated in the capacitor charging coil 2, as described above. Then, the CDI ignition unit 3 ignites and the engine starts. At this time, as shown in FIG. 5, since the potential V _{2 at the} point B is an open potential, the _second potential of the open potential detection circuit 27
The third comparator 29 constituting the functional unit detects this, outputs an "H" level signal, and makes the thyristor 31 conductive. For this reason, when the gear is switched from “neutral” to “first speed”, the limit release prevention rotation speed of 50
Even if the speed reaches 00 [rpm] and the second comparator 28 outputs a misfire signal that is an “H” level signal, the misfire signal is short-circuited by the thyristor 31. Therefore, the misfire is not performed, the rotation speed continues to increase, and thereafter, when the gear is switched, the first rotation speed control circuit, the first comparator 26, sets the rotation speed corresponding to each gear position (for example,
9500 rpm at 3rd speed, 7450 rpm at 4th speed, 5th speed
6350 [rpm], etc.), a misfire is performed, and a preset speed limit is performed for each gear position.
Further, even if the clutch is disengaged and the engine is started in a state where the gear is set to the "first speed", the "first speed"
When changing from "speed" to "second speed",
Since the open potential is detected at an intermediate position between "speed" and "second speed", a speed limit preset for each gear position is also performed in this case. The other hand, when connected "Race Kit" (speed restriction release kit), the resistance always R ₁ corresponds even when change-up even when "neutral" is connected, the third comparator 29 is "H"
Since the level signal is not output, the second comparator 2 constituting the first functional unit 27A of the open potential detection circuit 27 when the rotation speed reaches 5000 [rpm], which is the limit release prevention rotation speed.
8 outputs a misfire signal that is an "H" level signal, and this misfire signal is applied to the gate of the misfire thyristor 16, so that the misfire thyristor 16 conducts and the output of the capacitor charging coil 2 is released. Then, the charging of the ignition capacitor 6 is stopped. In this way, misfire is performed at an engine speed that does not exceed the speed limit.

According to the present embodiment described above, even if an attempt is made to release the speed limit by using a speed limit release kit such as a `` race kit '', a misfire automatically occurs when the speed reaches the limit release prevention rotation speed of 5000 (rpm). Since the speed limit is performed and the speed limit cannot be reached, the remodeling for canceling the speed limit by the “race kit” or the like can be almost completely prevented.

〔The invention's effect〕

Since the present invention is configured and functions as described above, according to this, instead of the limiting speed setting resistor having a predetermined resistance value corresponding to each gear position, a constant resistance is always connected instead of the "race". When a speed limit release kit such as a “kit” is used, since the second function unit of the open potential detection circuit does not detect the open potential, the misfire signal output function of the first function unit is not released. When the engine speed reaches a rotation speed that is set to be lower than the engine speed limit, a misfire signal for the misfire thyristor is output, so that a misfire occurs before the normal speed limit is reached. For this reason, it is possible to provide an unprecedented and excellent vehicle speed limiting device capable of effectively preventing the modification for releasing the speed limit using a “race kit” or the like.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention, FIG. 2 is an exploded perspective view showing a gear shift switch, FIG. 3 is an explanatory view showing the assembled state of the gear shift switch, and FIG. 1) and (2) are explanatory diagrams showing the arrangement of terminals and resistors in the gear shift switch main body, and FIG. 5 is a diagram showing the potential at point B in FIG. 1 corresponding to each gear position. 1 ... Magneto, 2 ... Capacitor charging coil, 3 ...
CDI ignition unit, 5 ... ignition coil, 6 ...
Ignition capacitor, 7: Thyristor for ignition as semiconductor switching element, 16: Thyristor for misfire, 25:
... Rotation detection circuit, 26 ... First comparator as rotation speed control circuit, 27 ... Open potential detection circuit, 27A ...
The first functional unit, 27B ...... second functional unit, 30 ...... gear position control unit, 40 ...... gearshift switches, R _1, R _2, R ₃
...... Restricted rotation speed setting resistance.

Claims (1)

(57) [Claims] An ignition capacitor that is charged by an electromotive force generated in a capacitor charging coil of a magnet in synchronization with rotation of an engine, and a charge stored in the ignition capacitor is converted to a primary voltage of an ignition coil according to an ignition signal. Having a semiconductor switching element for discharging through the side
A CDI ignition unit, a rotation detection circuit that detects the rotation speed of the engine and outputs a voltage corresponding thereto, and a misfire thyristor when the output of the rotation detection circuit reaches a value corresponding to a predetermined limit rotation speed. A rotation speed control circuit for opening the output from the capacitor charging coil by conducting the current; a gear shift switch for detecting a currently shifted gear position; and a limit rotation having a resistance value determined in advance corresponding to each gear position. And a gear position control unit configured to select a limit rotational speed setting resistor in accordance with the gear position detected by the gear shift switch and set a limit rotational speed of a rotational speed control circuit. In the vehicle speed limiting device, an open potential detection circuit is interposed between the rotation detection circuit and the misfire thyristor. An open-potential detecting circuit receives the output of the rotation detecting circuit and outputs a misfire signal to the misfire thyristor when the engine speed reaches a limit release prevention rotation speed set lower than the limit rotation speed of the rotation speed control circuit. And a second function unit that cancels the misfire signal output function of the first function unit when an open potential that appears between each gear position of the gear shift switch or at the time of the neutral position is detected. A speed limiting device for a vehicle, comprising: