JP2611457B2 - Internal combustion engine speed controller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an internal combustion engine speed control device that controls an internal combustion engine so as to limit the speed of a vehicle driven by the internal combustion engine.

[Prior Art] As an internal combustion engine speed control device for controlling the speed of a vehicle to be equal to or less than a set value, a vehicle speed detection signal is obtained from a speedometer attached to the vehicle, and the detected vehicle speed exceeds a set value. There is known an engine in which the operation of an ignition device for an internal combustion engine is stopped when the engine fires.

[Problems to be Solved by the Invention] In this type of conventional control device, if the wiring from the speedometer is disconnected, the speed control is not performed. Therefore, it is easy to perform a modification for removing the speed limit. If such a modification is made, reckless driving may be performed and a personal injury may occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide an internal combustion engine speed control device in which a modification for changing or canceling a speed limit cannot be easily performed.

[Means for Solving the Problems] An internal combustion engine speed control device according to the present invention includes, for example, a first
As can be seen, the ignition circuit 1, the vehicle speed detector 2,
A reset circuit 3, a vehicle speed detection circuit 4, a vehicle speed control command circuit 5, a signal source 6, an engine speed detection circuit 7, an engine speed control integration circuit 8, an engine speed control command circuit 9,
It comprises a modification detection coupling circuit 10 and an ignition operation stop circuit 11.

The ignition circuit 1 is a circuit for generating a high voltage to be applied to an ignition plug attached to a cylinder of an internal combustion engine when an ignition signal is given. The ignition circuit is a known circuit such as a capacitor discharge type or a current cutoff type. Can be used.

The vehicle speed detector 2 includes a vehicle speed detection switch unit that repeats on and off at a cycle inversely proportional to the speed of the vehicle driven by the internal combustion engine. As the vehicle speed detection switch unit, a speedometer attached to the vehicle is used. Can be used.

The reset circuit 3 is a circuit in which the output stage is turned on for a short time when the vehicle speed detection switch means in the vehicle speed detector 2 is turned on.

A vehicle speed detection circuit 4 having a first vehicle speed detection integration capacitor 4a having a first vehicle speed detection integration capacitor which is charged with a constant time constant and discharged through the output stage of the reset circuit 3;
A second vehicle speed detecting comparison circuit for comparing a terminal voltage of the first vehicle speed detecting integration capacitor with a set voltage; and a second vehicle speed detection integration capacitor whose charge and discharge are controlled by the output of the comparison circuit. And a vehicle speed detection integration circuit 4c for outputting a vehicle speed detection signal whose peak value changes according to the vehicle speed to both ends of the second vehicle speed detection integration capacitor.

The vehicle speed control command circuit 5 generates an ignition command signal when the vehicle speed detected by the vehicle speed detection circuit is equal to or less than a set value,
When the detected vehicle speed exceeds a set value, a misfire command signal is generated.

The signal source 6 generates a signal at a fixed position in synchronization with the rotation of the internal combustion engine. The signal source includes a signal coil in a signal generator attached to the engine and a magnet coil in a magnet generator attached to the engine. A power generation coil or the like can be used.

The engine speed detection circuit 7 performs an interval integration operation determined by a signal obtained from the signal source 6 to generate an integrated voltage whose peak value decreases with an increase in the rotation speed of the internal combustion engine. And an engine speed detection comparison circuit 7b that compares the integrated voltage with a reference voltage and keeps the output stage conductive while the integrated voltage exceeds the reference voltage.

The engine speed control integration circuit 8 includes an engine speed control integration capacitor that is charged with a fixed time constant and discharged through the output stage of the engine speed detection comparison circuit 7b.

The engine speed control command circuit 9 compares the terminal voltage of the integration capacitor of the engine speed control integration circuit 8 with a reference voltage, and generates a misfire command signal when the terminal voltage of the integration capacitor exceeds the reference voltage. An ignition command signal is generated when the terminal voltage of the integrating capacitor is equal to or lower than the reference voltage.

The alteration detection coupling circuit 10 includes an engine speed control integration circuit 8.
The reset circuit 3 is coupled to the engine speed control integration circuit 8 so that the integration capacitor therein is discharged through the output stage of the reset circuit 3.

The ignition operation stop circuit 11 is a circuit for stopping the operation of the ignition circuit 1 when a misfire instruction signal is generated from at least one of the vehicle speed control command circuit 5 and the engine speed control command circuit 9.

The ignition operation stop circuit may be a circuit for preventing supply of an ignition signal to the ignition circuit when a misfire instruction signal is given from at least one of a vehicle speed control command circuit and an engine speed control command circuit. Supply of power to the ignition circuit when an ignition command signal is given from both the command circuit for engine control and the command circuit for engine speed control, and a misfire occurs from at least one of the command circuit for vehicle speed control and the command circuit for engine speed control. A circuit that blocks supply of power to the ignition circuit when a command signal is given may be used.

[Operation] In the speed control device shown in FIG. 1, the vehicle speed is controlled to a speed lower than the speed limit by a system of a vehicle speed detector, a reset circuit, a vehicle speed detection circuit, a vehicle speed control command circuit, an ignition operation stop circuit, and an ignition circuit. A vehicle speed control system for controlling the engine speed is configured so that the rotation speed of the engine is limited by a system including a signal source, an engine speed detection circuit, an engine speed control integration circuit, an engine speed control command circuit, an ignition operation stop circuit, and an ignition circuit. An engine speed control system for controlling the engine speed to be kept below the speed is configured.

The vehicle speed detection circuit 4 outputs a vehicle speed detection signal whose peak value changes according to the vehicle speed. The vehicle speed control command circuit 5 generates an ignition command signal when the vehicle speed is equal to or lower than a set value, and generates a misfire command signal when the vehicle speed exceeds the set value.

Further, the engine speed detection integration circuit 7a generates an integrated voltage whose peak value decreases with an increase in the rotation speed of the engine, and the output stage of the engine speed detection comparison circuit 7b outputs the integrated voltage exceeding the reference voltage. Engine conduction state. The engine in which the output stage of the comparison circuit 7b becomes conductive becomes shorter as the engine speed increases. Since the integration capacitor of the engine speed control integration circuit is discharged through the output stage of the comparison circuit 7b,
The time during which the integrating capacitor is discharged becomes shorter as the rotational speed of the engine increases. Therefore, the terminal voltage of the integration capacitor (the output voltage of the integration circuit 8) increases as the engine speed increases. The engine speed control command circuit 9 generates a misfire command signal when the output voltage of the integration circuit 8 exceeds a reference voltage (when the engine speed exceeds a set value), and the output voltage of the integration circuit 8 is set to a reference value. An ignition command signal is generated when the voltage is lower than the voltage (when the rotation speed of the engine is lower than the set value).

In a normal state in which the vehicle speed detector is connected, the integration capacitor of the engine speed control integration circuit 8 is discharged through the reset circuit 3 every time the vehicle speed detection switch means 2a is turned on. Alternatively, the output voltage of the integrating circuit 8 is prevented from exceeding the reference voltage except when the engine is idled in a state of zero. Therefore, in a normal state in which the vehicle speed detector is connected, the engine speed control command circuit 9 does not generate a misfire command signal except when the engine is idled at a low speed or when the vehicle is stopped. The command circuit 9 generates an ignition command.

Therefore, in a normal state in which the vehicle speed detector 2 is connected, the ignition operation stop circuit is only provided when the vehicle speed exceeds a set value.
11 is given a misfire order. When a misfire command is given to the ignition operation stop circuit 11, the operation of the ignition circuit 1 is stopped, so that the engine is misfired and the vehicle speed is reduced to a set value or less.

When the wiring from the vehicle speed detector is disconnected to modify the control device, the output stage of the reset circuit 3 is kept in the cut-off state. It is not discharged but discharged only through the output stage of the engine speed detection comparison circuit 7b. Therefore, in this state, the output voltage of the engine speed control integration circuit 8 increases as the engine speed increases, and when the engine speed exceeds the set value and the output voltage exceeds the reference value. Then, the engine speed control command circuit 9 generates a misfire command signal. Therefore, the engine is misfired and its rotation speed is prevented from exceeding the set value.

As described above, according to the present invention, in addition to the vehicle speed control system for limiting the vehicle speed to the speed limit or less, the engine speed control system for limiting the engine speed to the speed limit or less is provided, and the vehicle speed detector is connected. When the vehicle is in operation, the vehicle speed control
Since the engine speed control system is operated when the vehicle speed detector is removed, it is possible to prevent a modification that increases the vehicle speed limit value from being performed.

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

FIG. 2 shows the overall configuration of an embodiment of the present invention. In FIG. 2, reference numeral 1 denotes an ignition circuit, and reference numeral 20 denotes a magnet power generator attached to an internal combustion engine, which is synchronized with the rotation of the engine. An exciter coil that outputs an AC voltage.

The ignition circuit 1 includes an ignition coil 101, a capacitor 102,
The exciter coil 2 comprises a known capacitor discharge type circuit including a thyristor 103, diodes 104 and 105, and a spark plug 106 attached to a cylinder of an internal combustion engine.
Driven by the output of the positive half cycle of In this ignition circuit, the output of the positive half cycle of the exciter coil 2 causes the capacitor 10 to pass through diodes 104 and 105.
2 is charged to the polarity shown. When the gate ignition signal Vi of the thyristor 103 is given at the ignition position of the internal combustion engine, the thyristor 103 conducts, and charges the capacitor 102 with the ignition coil.
The primary coil 101 is discharged. As a result, a high voltage is generated in the secondary coil of the ignition coil. Since this high voltage is applied to the ignition plug 106, a spark is generated in the ignition plug, and the engine is ignited.

Reference numeral 12 denotes a speed control circuit, which controls the signal source 6
Is a circuit for controlling the supply of an ignition signal Vi so as to keep the speed of the vehicle at a set value or less by using the output of the vehicle and the signal given by the vehicle speed detector 2 as inputs. As shown in FIG. Vehicle speed detection circuit 4 and vehicle speed control command circuit 5
A vehicle speed control system including an engine speed detection circuit 7, an engine speed control integration circuit 8, an engine speed control command circuit 9, and an ignition operation stop circuit 11; The presence or absence of the connection of the vehicle speed detector is detected from the operation of the circuit element of the vehicle speed control system (the reset circuit in the example of FIG. 1). A modification detection coupling circuit 10 that prioritizes the operation and couples both control systems so that only control operation by the engine control system is performed when it is detected that the wiring from the vehicle speed detector has been disconnected. .

Here, the limiting speed of the engine speed control system is such that the vehicle speed is maintained at or below the safe speed while the transmission mounted between the output shaft and the load of the internal combustion engine is switched to the highest speed position. The size is set.

Also, when the vehicle speed detector is connected, the engine speed control system will not issue a misfire command unless the engine is idled and its rotational speed is abnormally increased. Circuit constants have been adjusted.

As the signal source 6, for example, a signal coil in a signal generator attached to an engine is used.

As the vehicle speed detector 2, a speedometer mounted on a vehicle is used, and a switch provided in the speedometer and repeatedly turned on and off at a cycle inversely proportional to the vehicle speed is used as the vehicle speed detection switch means 2a.

In this example, a power supply circuit 21 is connected to the exciter coil 20, and a constant DC voltage obtained from the power supply circuit is applied to a power supply terminal of the speed control circuit 12.

The ignition circuit 1 may be any circuit that generates a high voltage for ignition when an ignition signal Vi is given, and a known circuit such as a capacitor discharge type circuit or a current cutoff type circuit is used. be able to.

FIG. 3 shows an embodiment in which a portion of the speed control circuit 12 (having the configuration of FIG. 1) in the embodiment of FIG. 2 is concretely described. The configuration of each part of this embodiment will be described below. I do.

Power supply circuit: Power supply circuit 21 is composed of diodes D1 to D3 and capacitor C1.
And a thyristor Th1 and a zener diode Z1. In this power supply circuit, when a voltage of a negative half cycle in the direction of the dashed arrow shown in the figure is induced in the exciter coil 2, the capacitor C1 is charged to the shown polarity through the diodes D1 and D2. When the voltage between both ends of the capacitor C1 reaches the set voltage, the Zener diode Z1 is turned on to supply a trigger signal to the thyristor Th1, so that the thyristor Th1 is turned on and the charging current of the capacitor C1 is bypassed from the capacitor. Therefore, a constant voltage determined by the Zener voltage of the Zener diode Z1 is obtained at both ends of the capacitor C1. The non-ground side terminal t1 of the capacitor C1 is an output terminal on the non-ground side of the power supply circuit (hereinafter referred to as a power supply terminal). Symbols given to predetermined terminals of each component shown below
t1 means that the terminal is connected to the power terminal t1.

Vehicle speed detector: The vehicle speed detector 2 is a switch provided in a speedometer attached to the vehicle, and is a switch means for detecting vehicle speed.
2a, one end of the switch means 2a is grounded. The switch means 2a repeatedly turns on and off at a cycle inversely proportional to the running speed of the vehicle.

Reset circuit: The reset circuit 3 includes resistors R1 to R3, NPN transistors Tr1 and Tr2, a capacitor C2, a Zener diode Z2, and a diode D4.

In this reset circuit, when the switch means 2a is off, a base current is supplied from the power supply circuit 21 to the transistor Tr1 through the resistor R1, the zener diode Z2, and the resistor R2, and the transistor Tr1 conducts. Therefore, the electric charge of the capacitor C2 becomes the transistor Tr1 and the diode D4.
Discharges instantly through When the switch means 2a is turned on, the transistor Tr1 is turned off, so that a short time (time until the charging of the capacitor C2 is completed) from the power supply circuit through the resistor R3 and the capacitor C2 is completed.
A base current flows through Tr2, and the transistor Tr2 conducts for a short time. When charging of capacitor C2 is completed, transistor Tr
2 is shut off. Therefore, the transistor Tr2 (the output stage of the reset circuit) is turned on for a short time each time the switch 2a is turned on. Voltage across switch means 2a
The waveforms of V1 and the base potential V2 of the transistor Tr2 are shown in FIGS. 4A and 4B, respectively, and the waveform of the collector potential V3 of the transistor T2 is shown in FIG. 4C.

First vehicle speed detection integration circuit: The first vehicle speed detection integration circuit 4a includes a first vehicle speed detection integration capacitor C3, a resistor R4, and a diode D5. The capacitor C3 is charged with a constant time constant from the power supply circuit 21 through the resistor R4. When the output stage (transistor Tr2) of the reset circuit 3 becomes conductive, the capacitor C3 is discharged instantaneously through the diode D5. Therefore the capacitor
As shown in FIG. 4 (D), switch means are provided at both ends of C3.
An integrated voltage V4 is obtained, which rises at a constant inclination from the position where 2a is turned on and returns to zero when the switching means 2a is turned on next time.

Vehicle speed detection comparison circuit: The vehicle speed detection comparison circuit 4b includes a voltage comparator CP1,
An integrated voltage V4 is applied to the negative-phase input terminal of the comparator. The vehicle speed detecting circuit 4 is provided with a set voltage generating circuit 4d composed of a series circuit of resistors R5 and R6, and a set voltage V5 obtained at both ends of the resistor R6 of this circuit is applied to the positive phase input terminal of the comparator CP1. I have. The potential of the output terminal of the comparator CP1 is high when the integrated voltage V4 is equal to or lower than the set voltage V5, and becomes low when the integrated voltage V4 exceeds the set voltage V5. Therefore, as shown in FIG. 4E, a rectangular wave signal V6 having the same width during the period when the integrated voltage V4 is equal to or lower than the set voltage V5 is obtained on the output side of the comparator CP1.
Since the peak value of the integrated voltage V4 decreases with an increase in the rotation speed of the engine, the angular width of the rectangular wave signal V6 increases with the increase in the rotation speed of the engine. It becomes shorter as the engine speed increases.

Second Vehicle Speed Detection Integration Circuit: The second vehicle speed detection integration circuit 4c includes resistors R7 and R8 and a capacitor C4. Capacitor C4 is comparator CP
During the period when the potential of the output terminal of 1 is at a high level, the power supply circuit is charged with a constant time constant through the resistors R7 and R8,
During a period in which the potential of the output terminal of the comparator CP1 is at a low level (ground potential), discharging is performed with a constant time constant through the resistor R8 and the output stage of the comparator CP1. A vehicle speed detection signal V7 as shown in FIG. 4 (F) is obtained at both ends of the capacitor C4. Since the time required for charging the capacitor C4 becomes shorter as the engine speed increases, when the vehicle speed is equal to or lower than the set value (limit value), the time set in the waveform shown by the solid line in FIG. 4 (F) is set. The voltage is higher than the voltage V8, and when the vehicle speed exceeds the set value, the voltage becomes lower than the set voltage V8 as shown by a waveform indicated by a broken line.

Vehicle speed control command circuit: The vehicle speed control command circuit 5 includes a comparator CP2, resistors R9 and R
And a set voltage generating circuit composed of ten.
The vehicle speed detection signal V7 obtained at both ends of the capacitor C4 is applied to the negative-phase input terminal of the comparator CP2, and the resistor R1 is applied to the positive-phase input terminal.
A set voltage V8 obtained at both ends of 0 is applied.

The voltage V9 at the output terminal of the comparator CP2 is at a high level as shown by a broken line in FIG. 4 (G) when the vehicle speed is equal to or lower than the set value, and this high-level voltage V9 becomes an ignition command signal. At the same time as the vehicle speed exceeds the set value, the voltage V9 at the output terminal of the comparator CP2 becomes zero level as shown by the solid line, and the zero-level voltage V9 becomes a misfire command.

Engine speed detection integration circuit: The engine speed detection integration circuit 7a has the emitter grounded.
An NPN transistor Tr3, a capacitor C5 connected between the collector and the emitter of the transistor Tr3,
A resistor R11 with one end connected to the base of 3 and a transistor Tr
3 and a resistor R12 connected between the power supply terminal. The other end of resistor R11 is connected to resistor R13 and capacitor C6.
Connected to one end of a parallel circuit with a resistor R13 and a capacitor C
The other end of the parallel circuit with the signal source 6 through the diode D6
Is connected to the non-ground side terminal of

The signal source 6 comprises a signal coil provided in a signal generator attached to the internal combustion engine, and outputs signal voltages V10 'and V10 as shown in FIG. 5 at a fixed position every time the engine makes one revolution. In this example, the capacitor C6, the resistor R13, and the diode D6 constitute a waveform shaping circuit 22. When the signal source 6 generates a signal voltage V10 of a positive half cycle in the direction of the solid arrow shown in FIG. Is given.

The capacitor C5 is charged with a constant time constant from the power supply circuit through the resistor R12. When a pulse signal is applied to the transistor Tr3, the transistor conducts and the capacitor C5
To discharge. Therefore, at both ends of the capacitor C5, as shown in FIG. 5 (B), an integrated voltage V11 rising from the position where the signal voltage V10 is generated with a predetermined gradient is obtained. The peak value of the integrated voltage V11 decreases as the engine speed increases.

Engine speed detection comparison circuit: The engine speed detection comparison circuit 7b includes a voltage comparator CP3, and the integrated voltage V11 across the capacitor C5 is applied to the negative phase input terminal of the comparator. A reference voltage V12 obtained from a reference voltage generating circuit 7c composed of a series circuit of resistors R15 and R16 is applied to the positive-phase input terminal of the comparator CP3. When the rotational speed of the engine is equal to or lower than the set value (the limit value at which the vehicle speed detection signal cannot be obtained), a period occurs in which the integrated voltage V11 exceeds the reference voltage V12, and the output stage of the comparator CP3 becomes conductive during this period. The output voltage V13 of the comparator becomes zero level. If the rotation speed during the period exceeds the set value, the integrated voltage V11 cannot exceed the reference voltage V12.
Output stage keeps the cutoff state, and the output voltage V13 of the comparator
Becomes a high level. The voltage V1 indicated by the broken line in FIG.
The waveform 1 is a waveform when the engine speed is equal to or less than the set value, and the output voltage V13 of the comparator CP3 at this time is shown in FIG.
As shown by the broken line in FIG. 7, the level becomes zero level while the integrated voltage V11 exceeds the reference voltage V12. When the rotational speed of the engine exceeds the set value, the integral voltage V11 cannot exceed the reference voltage V12 as shown by the solid line in FIG. 5 (B), so that it is shown by the solid line in FIG. 5 (C). As described above, the output voltage V13 of the comparator CP3 maintains the high level state.

Engine speed control integration circuit: The engine speed control integration circuit 8 is composed of an engine speed control integration capacitor C7 whose one end is grounded, and a resistor R17 connected between the non-ground side terminal of the capacitor C7 and the power supply terminal. The non-ground side terminal of the integrating capacitor C7 is connected to the output terminal of the comparator CP3. The integrating capacitor C7 is charged with a constant time constant from the power supply circuit through the resistor R17, and the comparator C is charged.
When the output stage of PU3 becomes conductive, it is discharged through the output stage.

Engine speed control command circuit: The engine speed control command circuit 9 includes a comparator CP4 and resistors R18 and R19 constituting a reference voltage generation circuit. The voltage V14 obtained across the integrating capacitor C7 is compared with the comparator CP4. Is applied to the negative-phase input terminal of. A reference voltage V15 obtained at both ends of the resistor R19 is applied to a positive-phase input terminal of the comparator CP4.

When the rotation speed of the engine is equal to or lower than the set value, a period occurs in which the output stage of the comparator CP3 is in a conductive state, and during this period, the capacitor C7 discharges through the output stage of the comparator CP3. Therefore, when the rotational speed of the engine is equal to or lower than the set value, the voltage V14 across the capacitor C7 has a waveform shown by a broken line in FIG. 5 (E). In this state, since the voltage V14 cannot exceed the reference voltage V15, the output voltage V16 of the comparator CP4 is as shown in FIG.
Hold the high level state as shown by the broken line in FIG.

When the engine speed exceeds the set value, the comparator PC3
Since the output stage of
Has a constant value (power supply voltage) as shown by the solid line in FIG. 5 (D).
4 is higher than the reference voltage V15. Therefore the comparator CP
The output voltage V16 of FIG. 4 is zero as shown by the solid line in FIG.

A state where the output voltage V16 of the comparator CP4 is at a high level is an ignition command, and a state where the output voltage V16 is zero is a misfire command.

Ignition signal supply circuit: In this embodiment, the signal voltage V10 is generated at the ignition position of the internal combustion engine, and the ignition signal Vi is supplied from the output side of the waveform shaping circuit 22 to the ignition circuit 1 through the resistor R14. It has become. Ignition signal supply circuit 2 by resistor R14
3 are configured.

Modification Detection Coupling Circuit: The modification detection coupling circuit 10 includes a diode D7 whose anode is connected to the non-ground terminal of the capacitor C7 and whose cathode is connected to the collector of the transistor Tr2 of the reset circuit 3.

As described above, since the capacitor C7 is coupled to the reset circuit 3 through the diode D7, the reset is performed when the vehicle speed detector 2 is operating normally and the vehicle is running (the vehicle speed is detected). Each time the transistor Tr2 in the output stage of the circuit 3 conducts, the capacitor C7 is discharged.

In this state where the capacitor C7 is discharged through the diode D7 and the transistor Tr2 (the state in which the vehicle speed detector 2 is connected and the vehicle is running), the engine is idled and the rotational speed becomes abnormal. Unless the voltage is increased, the voltage V14 across the capacitor C7 is equal to the reference voltage V15.
, The magnitude of the reference voltage V15 is set large enough. Therefore, while the vehicle is running, the voltage V14 across the capacitor C7 does not exceed the reference voltage V15, and the output voltage of the comparator CP4 is kept at a high level.

Ignition operation stop circuit: The output terminal of the comparator CP2, the output terminal of the comparator CP4, and the output terminal of the signal supply circuit 23 are commonly connected so as to form an AND circuit, and the common connection point is the ignition signal of the ignition circuit 1. The input terminal (in this example, the gate of the thyristor 103) is connected. The ignition operation stop circuit 11 is configured by a circuit (AND circuit) in which the output terminal of the comparator CP2, the output terminal of the comparator CP4, and the output terminal of the signal supply circuit 23 are commonly connected.

Command circuit 5 for vehicle speed control and command circuit 9 for engine speed control
State where the ignition command is given from both sides (comparator CP2
When the ignition signal supply circuit 23 generates the ignition signal Vi in a state where both the output voltage of the comparator CP4 and the output voltage of the comparator CP4 are at the high level, the ignition signal is given to the ignition circuit 1.
At this time, the ignition operation is performed without any trouble, and the engine operates normally.

Command circuit 5 for vehicle speed control and command circuit 9 for engine speed control
In the state where the misfire command is given from at least one of the comparators (the state where at least one of the output voltages of the comparators CP2 and CP4 is zero), the ignition signal Vi generated by the signal supply circuit 23 is output from the output stage of the comparator CP2 or CP4. , The ignition signal is not supplied to the ignition circuit 1. At this time, the ignition operation is stopped, and the rotation speed of the engine is reduced.

Other Embodiments In the above embodiment, the ignition operation was stopped by stopping the supply of the ignition signal to the ignition circuit 1 when the misfire command was given. However, as shown in FIG. Switch circuit 25 between coil (ignition power supply) and ignition circuit 1
Is inserted to keep the switch circuit 25 conductive when an ignition command is given from the speed control circuit 12, and the switch circuit 25 is turned off when a misfire command is given, thereby making the ignition operation May be stopped.

In each of the above embodiments, the signal source 6 is particularly provided.
As shown in FIG. 7, the exciter coil (ignition power supply) 20 may also be used as a signal source. In FIG. 7, reference numeral 23 denotes an ignition signal supply circuit, which comprises a capacitor C10, diodes D10 and D11, a thyristor Th2, and a zener diode Z3. Exciter coil
When 20 induces a negative half-cycle voltage in the direction of the dashed arrow shown, capacitor C10 through diodes D10 and D11.
Is charged to the illustrated polarity. When the voltage across the capacitor C10 reaches a predetermined value, the Zener diode Z3 conducts, and a trigger signal is given to the thyristor Th2. As a result, the thyristor Th2 conducts, and the electric charge of the capacitor C10 is discharged between the gate and the cathode of the thyristor 103 and through the thyristor Th2, so that an ignition signal is given to the ignition circuit 1.

In this embodiment, the waveform shaping circuit 22 includes a transistor Tr5, resistors R20 to R22, and diodes D12 and D13.
And a Zener diode Z4.

The transistor Tr5 is connected to a resistor R from a power supply circuit (not shown).
A base current is applied through 21 to conduct. When the exciter coil 20 generates a voltage of a negative half cycle in the direction of the dashed arrow shown in the figure, the diode D12 resistor R20 and the Zener diode Z4 for a short period of time when the voltage exceeds a predetermined level (a level that can make the Zener diode Z4 conductive). And a current flows through the diode D13. This current causes the voltage between the both ends of the diode D12 to be expensive, so that the base and the emitter of the transistor Tr5 are reverse-biased.
The transistor Tr5 is turned off for a short time, and a pulse voltage is obtained at the collector of the transistor. This pulse voltage is supplied to the engine speed detection integration circuit 7a.

[Effects of the Invention] As described above, according to the present invention, in addition to the vehicle speed control system for limiting the vehicle speed to the speed limit or less, the engine speed control system for limiting the engine speed to the speed limit or less is provided. When the vehicle speed detector is connected, the vehicle speed control system is given priority, and when the vehicle speed detector is removed, the engine speed control system is operated. There is an advantage that can be prevented from being performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a main part of the present invention, FIG. 2 is a configuration diagram showing an entire configuration of an embodiment of the present invention, and FIG. 3 is a circuit diagram showing an embodiment of FIG. 4 and 5
3 is a waveform diagram showing a signal wave system of each part of the vehicle speed control system and the engine speed control system of the embodiment of FIG. 3, FIG. 6 is a configuration diagram showing a configuration of another different embodiment of the present invention, FIG. FIG. 7 is a circuit diagram showing a configuration of a main part of still another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Ignition circuit 2 ... Vehicle speed detector 2a ... Vehicle speed detection switch means 3 ... Reset circuit 4 ... Vehicle speed detection circuit 5 ... Vehicle speed control command circuit 6 ... Signal source 7 ...
Engine speed detection circuit, 7a ... Integration circuit for engine speed detection, 7b
...... engine speed detecting comparator circuit, 8 ...... engine speed control integrating circuit, 9 ...... engine speed control command circuit, 10 ...... modified detection coupling circuit, 11 ...... ignition operation stop circuit.

Claims (3)

(57) [Claims] An ignition circuit for generating a high voltage to be applied to an ignition plug mounted on a cylinder of an internal combustion engine when an ignition signal is applied, and an on / off operation in a cycle inversely proportional to a speed of a vehicle driven by the internal combustion engine A vehicle speed detector provided with a vehicle speed detection switch means that repeats the following, a reset circuit that makes the output stage conductive for a short time when the vehicle speed detection switch means is turned on, and A first vehicle speed detection integration capacitor having a first vehicle speed detection integration capacitor discharged through an output stage of a reset circuit; and a vehicle speed detection comparing a terminal voltage of the first vehicle speed detection integration capacitor with a set voltage. A comparison circuit, and a second vehicle speed detection integration capacitor whose charge and discharge are controlled by the output of the vehicle speed detection comparison circuit; A vehicle speed detection circuit that includes a second vehicle speed detection integration circuit that obtains a vehicle speed detection signal whose peak value changes according to the vehicle speed; and an ignition command signal when the vehicle speed detected by the vehicle speed detection circuit is equal to or less than a set value. A vehicle speed control command circuit that generates a misfire command signal when the detected vehicle speed exceeds a set value, a signal source that generates a signal at a fixed position in synchronization with the rotation of the internal combustion engine, and the signal source An engine speed detecting integration circuit that performs an integral operation determined by the output of the internal combustion engine to generate an integrated voltage whose peak value decreases with an increase in the rotational speed of the internal combustion engine, and compares the integrated voltage with a reference voltage to perform the integration. An engine speed detection circuit including an engine speed detection comparison circuit in which an engine output stage whose voltage exceeds the reference voltage is turned on, and an engine speed detection comparison circuit that is charged with a fixed time constant and is output from the engine speed detection comparison circuit. Discharge An engine speed detection integration circuit having an engine speed control integration capacitor, and a terminal voltage of the engine speed control integration capacitor exceeding a reference voltage by comparing a terminal voltage of the engine speed control integration capacitor with a reference voltage. An engine speed control command circuit that generates a misfire command signal when the terminal voltage of the engine speed control integration capacitor is equal to or less than a reference voltage, A modification detection coupling circuit that couples the reset circuit to the engine speed control integration circuit so as to discharge the control integration capacitor; and a misfire command from at least one of the vehicle speed control command circuit and the engine speed control command circuit. An ignition operation stop circuit for stopping the operation of the ignition circuit when a signal is generated. Degree control device. 2. The ignition operation stop circuit prevents supply of an ignition signal to the ignition circuit when a misfire instruction signal is given from at least one of the vehicle speed control instruction circuit and the engine speed control instruction circuit. Claim 1 comprising a circuit.
3. The internal combustion engine speed control device according to claim 1. 3. The ignition operation stop circuit allows supply of power to the ignition circuit when the ignition command signal is given from both the vehicle speed control command circuit and the engine speed control command circuit. 2. The internal combustion engine according to claim 1, further comprising a circuit for preventing supply of power to the ignition circuit when a misfire instruction signal is given from at least one of the vehicle speed control command circuit and the engine speed control command circuit. Speed control device.