JPS60247032A - Stopping device for internal-combustion engine - Google Patents

Abstract

PURPOSE:To surely stop an engine upon abnormal operation, by providing a magnetic energization instructing signal supply circuit for supplying a magnetic energization instruction signal to a drive circuit when abnormal signals are delivered from timer circuits, a reset circuit and a timer control circuit. CONSTITUTION:Whether there occurs an abnormal condition which requires the stop of an internal combustion engine or not, is judged by means of first and second timer circuits 7, 9, a reset circuit 8 and a timer control circuit 10. When an abnormal signal is delivered, the timer control circuit 10 supplys a magnetic energization instruction signal Ve to a drive circuit 5. An actuator 3 operates a fuel supply control means 4 which stops and allows the supply of fuel to the engine. Thus, upon abnormal operation the engine may be surely stopped to prevent a coil in the actuator from being burnt.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an internal combustion engine stopping device that stops an internal combustion engine when an abnormality that requires stopping the engine occurs.

[Conventional technology] The pressure of lubricating oil in an internal combustion engine (hereinafter referred to as oil pressure).

) becomes abnormal, the temperature of the engine cooling water (hereinafter referred to as water temperature) becomes abnormally high, or the bell 1- that drives the fan that cools the engine breaks, etc. It is necessary to immediately stop the engine for inspection and repair, etc.
Conventionally, when oil pressure etc. became abnormal, the operator simply turned on an indicator such as a lamp, so if the driver overlooked the display, the engine could not be stopped and there was a risk of engine damage. there were. Therefore, the fuel supply control means that controls the supply of fuel to the internal combustion engine is held in the fuel supply permission state when the internal combustion engine is in the de-energized state to permit the supply of fuel, and when the fuel supply control means is energized, the fuel supply control means is set to the fuel supply stop state. A fuel supply control actuator that stops the fuel supply by applying an excitation command signal to the actuator's drive circuit when an abnormal condition that requires stopping the internal combustion engine occurs. An internal combustion engine stop device has been proposed that is energized. However, with this stop device, when an abnormal condition occurs, the actuator is kept in an excited state as long as the key switch is closed, so if the driver forgets to turn off the key switch, the coil of the actuator may burn out. Furthermore, in the conventionally proposed stopping devices, there is a possibility that an excitation command signal is applied to the actuator drive circuit until the oil pressure increases when the engine is started, causing the engine to stop, which poses a practical problem. Furthermore, in conventional devices in which fuel is supplied and stopped by an actuator, fuel supply control means (for diesel engines) supplies and stops fuel after the engine has stopped until the engine is started next time. In case of fuel injection pump,
In the case of a gasoline engine, the valve (specially installed to supply and stop the fuel) remains in the fuel supply stop state, so moisture may adhere to the fuel supply control means in cold weather and cause the fuel to stop. When the water freezes, the fuel supply control means stops working when the engine is started, making it impossible to start the engine.

[Object of the Invention] The object of the present invention is to provide a system that can reliably stop the engine when an abnormality occurs in oil pressure, water temperature, etc., and prevent the actuator coil from burning out if the key switch is forgotten to turn off. An object of the present invention is to provide an internal combustion engine stopping device that achieves the following.

[Structure of the Invention] The internal combustion engine stop device to which the present invention is directed maintains a fuel supply control means that controls the supply of fuel to the internal combustion engine in a fuel supply permissible state when the engine is in a non-excited state to supply fuel. a fuel supply control actuator that, when excited, brings the fuel supply control means into a fuel supply stop state to stop the fuel supply; and an actuator drive that excites the actuator when an excitation command signal is supplied. an abnormal signal output circuit that generates an abnormal signal when an abnormal condition that requires stopping the internal combustion engine occurs; and an excitation command signal that supplies the excitation command signal to the drive circuit when the abnormal signal is output. It is equipped with a supply circuit. Electric power for driving the actuator, the actuator drive circuit, the abnormal signal output circuit, and the excitation command signal supply circuit is supplied from a battery via a key switch attached to the device driven by the internal combustion engine, and the key switch is The battery can be switched to at least an off state in which the output of the battery is disconnected, an on state in which power is allowed to be supplied from the battery, and a starting state in which the starter motor for starting the engine is energized while maintaining the on state. There is. In the present invention, the excitation command signal supply circuit performs a timed operation when the key switch is turned on, outputs a stop operation permission signal after the timed operation ends, and supplies the first reset signal. a first timer circuit that stops outputting the stop operation permission signal when the key switch is in the on state, and a second reset circuit configured to give the excitation command signal to the drive circuit during the time limit operation and when the key switch is in the on state. a second timer circuit that is supplied with the signal and stops its time-limited operation while the reset signal is supplied; and a second timer circuit that stops the time-limited operation while the reset signal is supplied; The second timer circuit is prevented from being supplied with the second reset signal to the second timer circuit, and the second timer circuit is caused to perform a time-limiting operation when the third reset signal is supplied.
a timer control circuit that allows the second reset signal to be supplied to the timer circuit; and a timer control circuit that allows the supply of the second reset signal to the timer circuit of The device is equipped with a set circuit that supplies a reset signal.

In addition to the circuit that detects engine oil pressure, cooling water temperature, fan belt abnormality, load abnormality, etc. and outputs an abnormal signal to automatic fishing, Also included is a circuit that outputs an abnormal signal when the pushbutton switch is closed.

The "signal" in the above configuration includes not only a voltage or current signal but also a signal given by the on-state or off-state of the electrical switch means.

[Operation of the invention] In the above configuration, the operation time limit of the first timer circuit is
After the engine has started and power to the starter motor has been cut off (after the key switch has been returned from the starting state to the on state)
, is set approximately equal to or slightly longer than the time required for the oil pressure of the engine to rise to a normal value. Further, the operating time limit of the second timer circuit is set to be substantially equal to or slightly longer than the time required for the engine to actually stop after the fuel supply to the engine is stopped.

When a key switch attached to a device driven by an engine (vehicle 1, agricultural equipment, civil engineering work machine, engine generator, engine welding machine, etc.) is turned on, the first timer circuit starts a timed operation. The Ct signal is supplied to the second timer circuit.

The abnormality signal output circuit detects the pressure (oil pressure) of lubricating oil of the engine, the temperature (water temperature) of engine cooling water, etc., and outputs an abnormality signal when the oil pressure, water temperature, etc. are in an abnormal state. Before the engine is started, the oil pressure is low, so an abnormal signal is output from the abnormal signal output circuit that detects the oil pressure. During this period, the first timer circuit does not output the stop operation permission signal, so the timer control circuit allows the second reset signal to be supplied to the second timer circuit. Therefore, the second timer circuit has stopped its timed operation, and the excitation command signal is not supplied to the drive circuits of actuators 1 to 3.

This sharpening actuator is not energized, so when the key switch is switched to the start state and the starter motor is energized, I! Fuel is supplied to the engine and the engine starts. When the key switch is switched to the start state, the reset circuit supplies a reset I signal to the first timer circuit, so that the first timer circuit interrupts its timed operation and returns to its original state. When the engine is started and the key switch is turned back on, the first timer circuit begins its timed operation again. After the engine has started, when the timed operation of the first timer circuit ends,
The first timer circuit outputs a stop operation permission signal. At this time, the oil pressure of the engine is normal, so the timer control circuit allows the second reset signal to be supplied to the second timer circuit, and the second timer circuit is in a state where it does not output the excitation command signal. be. Therefore, the actuator is not energized and
Fuel is normally supplied to the engine and the engine is maintained in normal operating condition.

If an abnormal phenomenon such as a drop in oil pressure or an abnormal rise in water temperature occurs during engine operation, the abnormal signal output circuit outputs an abnormal signal.

At this time, the first timer circuit has already finished its timed operation and outputs the stop operation permission signal, so when the abnormal signal is output, the timer control circuit controls the second timer circuit to the second timer circuit. Prevents supply of set signal. The second timer circuit therefore begins a timed operation and provides an excitation signal to the drive circuit that drives the actuator. This energizes the actuator and blocks the supply of fuel to the engine. Therefore, the engine is prevented from being stopped and the engine is prevented from being damaged or the engine's BII device from becoming unusable due to the continuation of the abnormal condition. When the timed operation of the second timer circuit ends, the supply of the excitation command signal is stopped, so that the drive circuit de-energizes the actuator to prevent the actuator from burning out.

Further, when the engine is arbitrarily stopped during normal operation, when the key switch is turned off, the second timer circuit performs a timed operation and supplies an excitation command signal to the drive circuit for a predetermined period of time. Therefore, the actuator is energized for a certain period of time to stop the supply of fuel to the engine, and during this time the engine is stopped. After a certain period of time has elapsed, the actuator becomes de-energized and the fuel supply control means is brought into a fuel supply permission state.

Therefore, while the engine is stopped, the fuel supply control means is maintained in the fuel supply permission state.

As described above, the stop device of the present invention includes a first timer circuit that starts a timed operation when the key switch is returned from the starting state to the on state, thereby preventing the actuator from being excited when the engine is started. Since this has been prevented, the engine can be started without any problem.

In addition, when the engine stop device is activated, people often forget to turn off the key switch because the engine is stopped, but in the present invention, a second timer circuit is provided to stop the actuator for a certain period of time when stopping the engine. Since the actuator coil is only energized, it is possible to prevent the actuator coil from burning if you forget to turn off the key switch.

When the actuator is used to supply and stop fuel to the engine as described above, conventional fuel supply control has been used to supply and stop fuel during cold weather! If moisture adheres to the D1 stage (a fuel injection pump in the case of a diesel engine, or a special valve installed to supply and stop fuel in the case of a gasoline engine) and the moisture freezes, it will cause damage when starting the engine. The fuel supply control means becomes stuck, making it impossible to start the engine. In contrast, in the present invention, when a certain period of time has elapsed after the engine has stopped (when the timed operation of the second timer circuit has ended, the actuator is in a de-energized state and the fuel supply control means is in the fuel supply permission state). Therefore, even if moisture adheres to the fuel supply control means and the moisture freezes, the engine can be started without any problem.

[Example] The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an embodiment in which the present invention is applied to a deep-pill engine. In the figure, 1 is a device driven by the engine, such as a battery mounted on a vehicle. This battery is charged via a charging circuit by the output of a generator driven by the engine, and supplies power to a load such as a headlamp and at the same time supplies power to each part of the circuit of the stop device of the present invention. 2 is a key switch operated by a key, which has contacts B, OFF, BR, C, and R1;
By operating the key, you can change from the OFF state where the battery output is cut off, the preheating state where power is supplied to the preheating plug of the diesel engine, the on state where power is supplied to each part of the stopping device, and the starter motor that starts the engine. The device is sequentially switched to a starting state in which power is supplied to the starting state, and when switched to the starting state, the on state is maintained, and when the key is released from the starting state, it automatically returns to the on state.

When this key switch is in the off state, preheating state, on state, and starting state, each contact is connected as shown in Table 1.

Table 1 Table 1 above shows that in each state, the contacts marked with circles are electrically connected to each other.

Reference numeral 3 denotes an actuator that operates a fuel supply control means 4 that stops or allows the supply of fuel to the engine. This actuator operates the fuel supply control means 4 using a solenoid, motor, etc. as a driving source, and allows fuel to be supplied to the internal combustion engine when it is in a de-energized state, and when it is energized, it controls the fuel supply control means 4. The fuel supply control means 4 is operated to stop the supply of fuel. In the case of a diesel engine, the fuel supply control means 4 is a fuel injection pump, and the fuel injection pump is generally switched between a state in which fuel supply is allowed and a state in which fuel supply is stopped by operating a lever. It's like this.

A drive circuit 5 drives the actuator 3, and supplies an excitation current to the actuator 3 when the excitation command signal e is input. 6 is when the oil pressure, water temperature, etc. become abnormal, when the fan belt breaks, when the emergency button is pressed, etc. l!
Abnormal signal ■a when an abnormal situation occurs that requires the stoppage of the
This is an abnormal signal output circuit that outputs.

7 is a first timer circuit, and this timer circuit operates when the key switch 2 is turned on (B contact and BR
When the contact is connected), a timed operation is performed, and after the timed operation ends, a stop operation permission signal Sa is output, and when the first reset signal Vr1 is given from the reset circuit 8, the stop operation permission signal is outputted. Stop outputting.

Reference numeral 9 denotes a second timer circuit, and this timer circuit is configured to give an excitation command signal Ve to the drive circuit 5 only during a timed operation, and a second reset signal Vr2 is supplied when the key switch 2 is in the on state. The timer operation is stopped while the reset signal Vr2 is supplied.

10 is a timer control circuit, which controls the abnormality signal Va when the stop operation permission signal N V Sa is output.
is output, the second reset signal Vr2 is blocked from being supplied to the second timer circuit 9, causing the second timer circuit 9 to perform a time-limiting operation, and the third reset signal Vr3 is supplied from the reset circuit 8. When this occurs, the second reset signal Vr2 is allowed to be supplied to the second timer circuit 9. In this embodiment, this timer control circuit 10 includes a gate circuit 10A that outputs a set signal ES when an abnormality signal Va and a stop operation permission signal Vsa are input at the same time, and a gate circuit 10A that outputs a set signal ES when an abnormality signal Va and a stop operation permission signal Vsa are input, and a gate circuit 10A that outputs a set signal ES when the signal Es is applied. and outputs the second reset signal Vr2 to the O terminal, and when the key switch 2 is switched to the preheating state and when it is switched to the starting state, the third reset signal Vr3 is supplied and reset. It is separated from the flip-flop circuit 10B.

The reset circuit 8 supplies first and third reset signals to the first controller, the timer circuit 7, and the timer control circuit 10, respectively, when the key switch 2 is switched to the preheating state and the starting state.

In this embodiment, first and second timer circuits 7 and 9,
The reset circuit 8 and the timer control circuit 10 supply an excitation command signal VC to the drive circuit 5 when an abnormal signal indicating that an abnormal condition that requires stopping the internal combustion engine has occurred is output. A supply circuit is configured.

Reference numeral 11 denotes a power supply circuit, which outputs a voltage adjusted to a constant -0 when the key switch 2 is in an on state, and supplies the constant voltage to the first and second timer circuits.

Referring to FIG. 2, there is shown an embodiment that embodies the configuration of FIG. 1 above. In FIG. 2, the actuator 3 consists of a solenoid 3a and a plunger 3b driven by the solenoid, and one end of the solenoid 3a is grounded. In this actuator, when the solenoid 3a is energized, the plunger 3b operates a fuel supply control means (not shown) to stop the fuel supply, and when the solenoid 3a is de-energized, the plunger 3b
is restored and the fuel supply control means is brought into a fuel supply permission state.

The drive circuit 5 has a transistor 5a connected to the non-grounded terminal of the solenoid 3a, a resistor 5b connected between the pace emitters of the transistor 5a, and a resistor 5C connected to the emitter and the collector connected to the transistor 5a. A transistor 5d connected to the base of the transistor 5a, a transistor 5e whose emitter is grounded and whose collector is connected to the base of the transistor 5d, a resistor 5↑ connected between the base and emitter of the transistor 5e, and a transistor 5e. A resistor 5q has one end connected to the base of the transistor 5d, a resistor 5h has one end connected to the base of the transistor 5d, a diode 51 has a cathode connected to the emitter of the transistor 5a, and an anode is connected between the collector of the transistor 5a and ground. The anode of the diode 51 is connected to the B contact of the key switch 2 (the positive terminal of the battery 1).

In this drive circuit, when the transistor 5e is in a cut-off state and the transistor 5d h< is conductive, a base current flows to the transistor 5a, making the transistor 5a conductive, and when the (~run raster 5a is conductive), the battery 1 An excitation current is supplied to the solenoid 3a of the Akubuko 3 through the emitter-collector of the transistor 5a.

The abnormal signal output circuit 6 is an indicator lamp (a light emitting diode may also be used), one end of which is connected to the BR contact of the key switch 2.
8 and 6b, and detection contacts 6C and 6d connected between the other ends of indicator lamps 6a and 6b and ground, respectively.
Diodes 6e and 6f have their cathodes connected to the connection points between C and 6d and indicator lamps 6a and 6b, and their anodes are commonly connected, a diode 6q has its anode connected to the BR contact, and an emitter is connected to the cathode of diode 6q. The connected base is connected to the diode 5 through the resistor 61.
It consists of a transistor 6h connected to a common connection point of transistors e and 5f, and a resistor 6j connected between the base and emitter of the transistor 6h. Contacts 6C and 6d are contacts provided on a detector that detects the oil pressure and water temperature of the engine, respectively. When the oil pressure reaches a set value or higher, contact 6C closes, and when the water temperature exceeds the set value, contact 6d closes. It is supposed to close. Note that if the detectors for detecting the oil pressure and water temperature are non-contact type, it goes without saying that the contacts 6C and 6d are replaced with output non-contact switches (closed in the event of an abnormality) of the respective detectors.

In this abnormality signal output circuit 6, when the key switch is in the on state, the oil pressure or water temperature becomes abnormal and the contact 6C
Or when 6d is closed, battery 1 to diode 6 (
], a current flows through the resistor 6 J % 6 I 1 diode 6e or 6f, and the contact 6C or 6d, and the indicator lamp 6a or 6b lights up to indicate that the oil pressure or water temperature has exceeded the current. Also at this time, transistor 6
A base current flows through h, making the transistor conductive, and an abnormal signal is output through the emitter-collector of the transistor.

Further, in this embodiment, a charging control circuit 13 is provided which inputs the output of a generator 12 driven by l1llll and supplies a charging current to the battery 1. The charging control circuit 13 supplies a predetermined output necessary for charging the battery 1 from the generator 12 to a power terminal 13a connected to the BR contact of the key switch 2 and to h when the key switch 2 is in the on state. It has an abnormal signal output terminal 13b that outputs an abnormal signal when the abnormal signal is not detected, and an indicator lamp 14 is connected between the abnormal signal output terminal 13b and ground. Therefore, when the key switch 2 is held in the on state and the engine is stopped, the fan belt that transmits the rotation of the engine to the generator 12 and a fan for the cooling part of the engine (not shown) breaks and the generator 12 When the output stops, the display lamp 14 lights up and an abnormality signal is output to the terminal 13b. That is, in this embodiment, the charging control circuit 13 forms part of the abnormality signal output circuit 6.

The first timer circuit 7 includes a comparator 7a, a positive phase input terminal of the comparator 7a, and a power supply input terminal t1 (a power supply circuit 1 to be described later).
A constant voltage is given from 1. ), a capacitor 7d connected between the positive phase input terminal and the ground, a resistor 7e connected between the negative phase input terminal of the comparator and the ground, and the negative phase input It consists of a resistor 7f connected between the terminal and the power input terminal t1, and a reset transistor 7q in which a collector-emitter circuit is connected in parallel to both ends of a capacitor 7d with the emitter facing the ground side. A predetermined voltage is applied between the power supply terminal T1 of the comparator 7a and the ground from a power supply circuit 11, which will be described later.

In this timer circuit, when a constant voltage is applied to the power supply input terminal 1:1, the capacitor 7d is charged at a constant time constant through the resistor 7C, thereby performing a timed operation. Resistors 7e and 7f constitute a reference voltage generation circuit, which divides the voltage applied between the power supply input terminal 7b and the ground and generates the resistor 7.
A reference voltage E'1 is output across the capacitor 7d. When the terminal voltage EC1 of the capacitor 7d is less than the reference voltage E'1 obtained across the resistor 7e, the output terminal of the comparator 7a is grounded, and the capacitor 7d After a predetermined operation time has elapsed after the charging of capacitor 7d has started, the terminal voltage Ec1 of capacitor 7d increases.
When exceeds the reference voltage E'1, the output terminal of the comparator 7a becomes ungrounded (the stop operation permission iT signal Sa is output).

The reset circuit 8 includes a series circuit of resistors 8a and 8b connected between the cathode of the diode 6q and ground, and a resistor Qa whose emitter is grounded and whose base is a resistor Qa.

A transistor 8C connected to the connection point of the transistor 8b, a resistor 8d connected between the collector of the transistor 8C and the power input terminal t1, a diode 8e whose anode is connected to the collector of the transistor 8C, and a diode 8
A resistor 8q is connected between the cathode of e and the ground, a resistor 8h has one end connected to the cathode of the diode 8q, the cathode is commonly connected to the other end of the resistor 8h, and the anode is connected to the contacts C and R1 of the key switch 2. It consists of diodes 81 and 8j connected to , respectively, and has a resistance of 8 g.

The connection point 8h is connected to the base of the reset transistor 7q of the first timer circuit 7. Further, a common connection point of the cathodes of the diodes 81 and 8j is connected to a reset terminal R of a flip-flop circuit 10b to be described later.

In this reset circuit 8, when the key switch 2 is turned on, a pace current is supplied to the transistor 8C, the transistor 8C becomes conductive, and the base of the reset transistor 7g is passed through the resistor 8d and the diode 8e. Prevent current from flowing. Also, when the key switch is switched to the preheating state or starting state, the diode 81
Alternatively, since the base current is supplied to the transistor 7Q through 8j and the resistor 8h (the first reset signal Vr1 is supplied), the transistor 8f becomes conductive and short-circuits both ends of the capacitor 7d. This causes capacitor 7d
The electric charge is made zero, and the first timer circuit 7 is reset (at this time, the first timer circuit 7 cannot perform a time-limiting operation). Further, when the key switch 2 is switched to the starting state or the preheating state, the diodes 8i and 8j are passed through the diodes 8i and 8j.

A third reset signal ``r3'' is supplied to the reset terminal of the flip-flop circuit 10B.

The second timer circuit 9 includes a comparator 9a, a resistor 9b connected between the positive phase input terminal of the comparator 9a and ground, and a capacitor 9 connected between the negative phase input terminal of the comparator 9a and ground.
C, a resistor 9d connected between the positive phase input terminal of the comparator 9a and the output terminal to of the power supply circuit 11, and a resistor 9d connected between the negative phase input terminal of the comparator and the output terminal of the power supply circuit. A resistor 9e, a transistor 9f whose collector-emitter circuit is connected in parallel to both ends of a capacitor 9C with the emitter facing the ground side, a resistor 9q connected in parallel between the base and emitter of the transistor 9f, and the base of the transistor 9f. The other end of the resistor 9h is connected to the output terminal Q of a flip-flop circuit 10B, which will be described later, together with the other end of the resistor 5q of the drive circuit 5.

The gate circuit 10A consists of resistors 10a and 10b, one end of which is connected to the output terminal of the comparator 7a, the other end of the resistor 10a is connected to the collector of the transistor 6h of the abnormal signal output circuit 6, and the other end of the resistor 10b is connected to the collector of the transistor 6h of the abnormal signal output circuit 6. The anode is connected to the resistor 10b.
It is connected to the normal signal output terminal 13b of the charging control circuit 13 via a Zener diode 15 with its cathode facing the Zener diode side and a diode 16 with its cathode facing the Zener diode side.

In this second timer circuit, a capacitor 9C is charged through a resistor 9e to perform a timed operation. When the terminal voltage EC2 of the capacitor 9C is less than the reference voltage Er2 obtained across the resistor 9b, the output terminal of the comparator 9a is in a non-grounded state (a state in which an excitation command signal is supplied).
When the terminal voltage EC2 of the capacitor 9G exceeds the reference voltage Er2 across the resistor 9b, the output terminal of the comparator 9a becomes grounded (a state in which the excitation command signal Ve is not supplied).

The flip-flop circuit 10B, which constitutes a timer control circuit together with the gate circuit 10A, includes a transistor 10C whose emitter is grounded, a transistor 10d whose emitter is grounded and whose base is connected to the collector of the transistor 10c, and transistors i to 10c. A resistor 10e connected between the base and emitter, a resistor 101' whose one end is connected to the base of the transistor 10c, and the transistor 1
A resistor 100 connected between the 0G collector and the power supply terminal t2, a thyristor 10h whose cathode is connected to the collector of the transistor 10d, a resistor 101 whose one end is connected to the anode of the thyristor 10h, and the thyristor 10.
The other end (reset terminal R) of the resistor 10f is connected to the gate of the thyristor 10h (reset terminal R) at the common connection point of the diode 6+ of the reset circuit 8 and the cathode of sj. 1 to terminal S) are resistors 10a and 1o of the gate circuit 7.
They are respectively connected to the connection points of b. Also, resistance 10i
The other end is connected to the BR contact of the key switch 2 through the diode 6q, and the anode (output terminal Q) of the Zener diode 10j is connected to the common connection point of the resistors 5o and 9h.

The power supply circuit 11 has a diode 11a whose anode is connected to the contact BR of the key switch through a diode 6q, a capacitor 11b connected between the cathode of the diode 11a and the ground, and a voltage across the capacitor +111b. and a diode 11d whose cathode is connected to the non-ground terminal of the capacitor 11b, and the non-ground terminal (output terminal To) of the capacitor 11b is connected to the power supply terminals T1 and T2 of the comparators 7a and 9a. are connected to each. Further, the output terminal to of the regulator 11C is connected to the power supply terminal t1 of the first timer circuit 7 and the power supply terminal t2 of the flip-flop circuit 10B.

Next, the operation of the first embodiment will be explained. In the embodiment described above, the operating time limit of the first timer circuit 7 (the time from when charging of the capacitor 7d starts until the terminal voltage ECI of the capacitor exceeds the reference voltage Er1) is the period when the engine starts and
After the power to the starter motor is cut off (after the key switch is turned back from the starting state to the on state), the time required for the engine oil pressure to rise to its normal value is approximately equal to, or slightly longer than, the time ( For example, the operating time limit of the second timer circuit 9 (the time from the start of charging of the capacitor C until the terminal voltage of the capacitor exceeds the reference voltage Vr2) is set to 1 (for example, about 6 seconds). Approximately equal to or slightly longer than the time required for the engine to actually stop after the supply of fuel to the engine is stopped (e.g., approximately 25
seconds).

When a key switch 2 attached to a device driven by an engine (vehicle 1, agricultural equipment, civil engineering machine, engine generator, engine welding machine, etc.) is turned on, the output of the power supply circuit 11 causes the first Capacitor 7d of timer circuit 7
is charged through the resistor 7C and a timed operation is started.

The abnormality signal output circuit detects the engine's lubricating oil pressure (oil pressure), engine cooling water shortage (water temperature), etc., and outputs an abnormality signal va when the oil pressure, water temperature, etc. are in an abnormal state. do. In the state before the engine is started, the oil pressure is low, so the abnormal signal Va is output from the abnormal signal output circuit that detects the oil pressure, but the first timer circuit 7 ends the timed operation. Until then, the first timer circuit 7 does not output the stop operation permission signal Vsa, so the output terminal Q of the flip-flop circuit 10B of the timer control circuit is in a non-grounded state (
thyristors 10h and 10d are blocking),
``The second reset signal Vr2 is allowed to be supplied to the second timer circuit 9. Therefore, the second timer circuit 9
has stopped its timed operation. At this time, the base is also supplied to the transistor 5e, so that the transistor 5e becomes conductive, forcing the output terminal of the comparator 9a and the base of the transistor 5d to be grounded. Therefore, the transistor 5d is in a cut-off state and no base current flows through the transistor 5a, so that the transistor 5a is not conductive and no excitation current is supplied to the actuator 3. At this time, the fuel supply control means is in a state where it can supply fuel. When the key switch 2 is switched to the preheating state, the preheating plug is energized and the inside of the cylinder of the engine is heated, and when the key switch 2 is switched to the starting state and the starter motor is energized, fuel is supplied to the engine. starts. When the key switch 2 is switched to the preheating state or the starting state, the reset circuit 1 to the circuit 8 output the reset signal V to the first timer circuit 7.
To supply rl, the first timer circuit 7 interrupts its timed operation and the capacitor 7d(7)ffl is discharged and returns to its original state. When the engine starts and the key switch 2 is turned back on, the transistor 70 is cut off, so the first
The capacitor 7d of the timer circuit 7 is charged again, and a timed operation is started. After the engine is started, when the timed operation of the first timer circuit ends, the output terminal of the comparator 7a of the first timer circuit becomes non-grounded (the stop operation permission signal vSa is output). At this time, the oil pressure of the engine is normal, so the thyristors 10h and 10d are in a cut-off state in the flip-flop circuit 10B of the timer control circuit, and the second reset 1~ signal is supplied to the second timer circuit 9. is allowed. Therefore, the drive circuit 5 is in a state in which no excitation command signal is given (a state in which transistors 1 to 5d are cut off). At this time, the actuator 3 is not excited, fuel is normally supplied to the engine, and the engine is maintained in a normal operating state.

When an abnormal phenomenon such as a drop in oil pressure or an abnormal rise in water temperature occurs during operation of the engine, the transistor 6h of the abnormal signal output circuit 6 becomes conductive and outputs an abnormal signal. At this time, the first timer circuit 7 has already finished its timed operation and is outputting a stop operation permission signal (the output terminal of the comparator 7a is in a non-grounded state), so an abnormal signal is not output. Then, a firing signal is supplied to the thyristor 10h of the flip-flop circuit 10B. Therefore, the thyristor 10h becomes conductive and the transistor 10d becomes conductive. At this time, the supply of base current to transistors 9f and 5e is blocked, so both transistors 9f and 5e are cut off. 1 to 9 transistors are cut off, capacitor 9C
Charging is started, and the timer operation of the second timer circuit 9 is started.

While this timed operation is being performed, the output terminal of the comparator 9a is not grounded, and the first resistor 5e is in the cutoff state, so the transistor 5d is conductive and the base current is passed to the transistor 5a.

Therefore, the transistors 1 to 5a are conductive, and no excitation current flows through the actuator 3. This causes the fuel supply control means to stop supplying fuel, and the engine stops. The terminal voltage of the capacitor 9G is the reference voltage v across the resistor 9b.
When r2 is exceeded and the timed operation ends, the output terminal of the comparator 9a becomes grounded, so the transistor 5d becomes cut off, and the I/transistor 5a becomes cut off. Therefore, the actuator 3 becomes de-energized, and the fuel supply control means returns to a state in which it can supply fuel.

The above operation stops the engine and prevents the engine from being damaged or the engine's attached equipment from becoming unusable due to the continuation of the abnormal condition. Further, after the engine has stopped, the fuel supply control means automatically returns to a state in which fuel supply is permitted in preparation for starting the next engine. Furthermore, upon completion of the timed operation of the second timer circuit, the supply of the excitation command signal is stopped, thereby preventing the coil of the actuator from burning out.

To stop the engine arbitrarily during normal operation, press key switch 2.
When switched to the off state, the supply of base current to the transistors 9f and 5e is stopped, so the second timer circuit 9 performs a timed operation to supply an excitation command signal to the drive circuit 5 for a certain period of time, and the transistors 9f and 5e are turned off. 5d and 5a are brought into conduction. Therefore, the actuator 3 is energized for a certain period of time to stop supplying fuel to the engine, and the engine is stopped during this period.

After a certain period of time has elapsed, the output J terminal of the comparator 9a goes into a solid state and the transistor 5d is cut off, so that the transistor 5a is cut off. Therefore, the actuator 3 becomes de-energized, and the fuel supply control means is brought into a fuel supply permission state. Therefore, while the engine is stopped, the fuel supply control means is maintained in the fuel supply permission state.

In the above example, the target was a diesel engine, so
If the key switch 2 is provided with R1 to switch the key switch 2 to the preheating state, or if a gasoline engine is targeted, the R1 contact and the circuit connected to the contact are unnecessary. In addition, in the case of a Kallin engine, it does not have a fuel supply control means that has a function of completely shutting off fuel like a fuel injection pump normally installed in a diesel engine, so when applying the present invention, it is necessary to control the fuel supply. It is necessary to provide a special valve that constitutes the means.

The above-mentioned embodiment merely shows an example of the structure of each part of the structure of the present invention, and it goes without saying that the structure of each part of the present invention is not limited to the above-mentioned embodiment.

[Effects of the Invention] - As described in V, according to the present invention, a first timer circuit is provided that starts the timed operation when the key switch is returned from the starting state to the on state, and the actuator is activated when the engine is started. Since the magnet is prevented from being excited, the engine can be started without any problem. In addition, when the engine stop device is activated, people often forget to turn off the key switch because the engine is stopped, but in the present invention, a second timer circuit is provided to stop the actuator for a certain period of time when stopping the engine. Since the actuator coil is only energized, it is possible to prevent the actuator coil from burning out if you forget to turn off the key switch. Furthermore, when a certain period of time has passed after the engine has stopped (when the timed operation of the second timer circuit has ended), the actuator becomes de-energized and maintains the fuel supply control means in the fuel supply permissible state. Even if moisture adheres to the fuel supply control means and the moisture freezes, the engine can be started without any problem.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention, and FIG. 2 is a circuit diagram showing an embodiment in which each part of FIG. 1 is embodied. DESCRIPTION OF SYMBOLS 1... Disassembly, 2... Key switch, 3... Actuator, 4... Fuel supply control means, 5... Drive circuit, 6... Abnormal signal output circuit, 7... First 8... Reset circuit, 9... Second timer circuit, 1°... Timer control circuit, 11... Power supply circuit. Procedural amendments (Self-restraint February 15, 1985 Manabu Shiga, Commissioner of the Japan Patent Office1, Indication of the case Japanese Patent Application No. 1982-1022412, Name of the invention Internal combustion engine stop device 3, Person making the amendment Relationship with the case) Patent Applicant (134) Kokusan Denki Co., Ltd. 4, Agent Shin [4-31-6 Bunzan Building 6th Floor, 6th floor, Minato-ku, Tokyo] Full text of the specification 6, Contents of the amendments are as per the attached revised specification. 1. Name of the invention Internal combustion engine stop device 2. Claims: An internal combustion engine stopping device that maintains a fuel supply control means that controls the supply of fuel to the internal combustion engine in a fuel supply permission state when it is in a de-energized state to permit the supply of fuel. a fuel supply control actuator that, when excited, brings the fuel supply control means into a fuel supply stop state to stop the fuel supply; an actuator drive circuit that excites the actuator when an excitation command signal is supplied; An abnormal signal output circuit that outputs an abnormal signal when an abnormal condition that requires stopping occurs, and an excitation command signal supply circuit that supplies the excitation command signal to the drive circuit when the normal signal is generated, Electric power for driving the actuator, the actuator drive circuit, the abnormal signal output circuit, and the excitation command signal supply circuit is supplied from a battery via a key switch attached to the device driven by the internal combustion engine, and the key switch is In an internal combustion engine stopping device that is switched between at least an off state in which the output of the battery is cut off, an on state in which the supply of electric power from the battery is allowed, and a starting state in which electricity is supplied to a starter motor for starting the engine while maintaining the on state. , the excitation command signal supply circuit performs a timed operation when the key switch is turned on, outputs a stop operation permission signal after the timed operation ends, and outputs a stop operation permission signal when the first reset signal is supplied. a first timer circuit configured to stop outputting the stop operation permission signal; and a second reset signal configured to give the excitation command signal to the drive circuit during timed operation, and supply a second reset signal when the key switch is in an on state. a second timer circuit which stops its time-limited operation while the second NORMAL REF1~ signal is being supplied, and when the abnormal signal is output while the stop operation permission signal is being output; blocking the supply of the second reset signal to the second timer circuit to cause the second timer circuit to perform a time-limiting operation; a timer control circuit that allows the supply of a 11-summer start-up signal; and a timer control circuit that supplies the first and third reset signals to the first timer circuit and the timer control circuit when the key switch is switched to a starting state. 1. An internal combustion engine stopping device, characterized in that it is equipped with an internal combustion engine stopping device. 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an internal combustion engine stopping device that stops an internal combustion engine when an abnormality that requires stopping the engine occurs. [Prior art] When the pressure of the lubricating oil of the internal combustion engine (hereinafter referred to as oil pressure) becomes abnormal, the temperature of the engine cooling water (hereinafter referred to as water temperature) becomes abnormally high, or when the engine is cooled. When the belt that drives the fan breaks, etc., it is necessary to immediately stop the engine and perform inspection and repair, but conventionally, when there is an abnormality in oil pressure, etc., an indicator such as a lamp is simply turned on. Therefore, if the driver overlooked the display, he would not be able to stop the engine, and there was a risk of damage to the engine. Therefore, the fuel supply control means that controls the supply of fuel to the internal combustion engine is held in the fuel supply permission state when the internal combustion engine is in the de-energized state to permit the supply of fuel, and when the fuel supply control means is energized, the fuel supply control means is set to the fuel supply stop state. A fuel supply control actuator that stops the supply of fuel is provided, and when an abnormal condition that requires stopping the internal combustion engine occurs, an excitation command signal is provided to a drive circuit of the actuator to excite the actuator. An internal combustion engine stop device was proposed. However, with this stop device, when an abnormal condition occurs, the actuator is kept in an excited state as long as the key switch is closed, so if the driver forgets to turn off the key switch, the coil of the actuator may burn out. Furthermore, in the conventionally proposed stopping devices, there is a possibility that an excitation command signal is applied to the actuator drive circuit until the oil pressure increases when the engine is started, causing the engine to stop, which poses a practical problem. In the conventional device in which fuel is supplied and stopped by an actuator, fuel supply control means is used to supply and stop fuel after the engine has stopped and until the engine is started next time. (Fuel injection pump for diesel engines,
In the case of a gasoline engine, the valve (specially installed to supply and stop the fuel) remains in the fuel supply stop state, so moisture may adhere to the fuel supply control means in cold weather and cause the fuel to stop. When the water freezes, the fuel supply control means stops working when the engine is started, making it impossible to start the engine. [Object of the Invention] The object of the present invention is to provide a system that can reliably stop the engine when an abnormality occurs in oil pressure, water temperature, etc., and prevent the actuator coil from burning out if the key switch is forgotten to turn off. An object of the present invention is to provide an internal combustion engine stopping device that achieves the following. [Structure of the Invention] The internal combustion engine stop device to which the present invention is directed maintains the fuel supply control means that controls the supply of fuel to the internal combustion engine in the fuel supply permission state when the engine is in the de-energized state, thereby stopping the fuel supply. a fuel supply control actuator that puts the fuel supply control means into a fuel supply stop state to stop the fuel supply when the fuel supply control means is allowed and energized; and an actuator drive circuit that energizes the actuator when an excitation command signal is supplied. an abnormal signal output circuit that generates an abnormal signal when an abnormal condition that requires stopping the internal combustion engine occurs; and an excitation command signal supply circuit that supplies the excitation command signal to the drive circuit when the abnormal signal is output. It is equipped with Electric power for driving the actuator, the actuator drive circuit, the abnormal signal output circuit, and the excitation command signal supply circuit is supplied from a battery via a key switch attached to a device driven by the internal combustion engine, and The switch can be switched between at least an off state in which the output of the battery is cut off, an on state in which power is allowed to be supplied from the battery, and a starting state in which power is supplied to a starter motor for starting the engine while maintaining the on state. ing. In the present invention, the excitation command signal supply circuit performs a timed operation when the key switch is turned on, outputs a stop operation permission signal after the timed operation ends, and supplies the first reset signal. The circuit includes a first timer circuit configured to stop outputting the stop operation permission signal, and a second timer circuit configured to apply the excitation command signal to the drive circuit during timed operation and when the key switch is in the on state. a second timer circuit that is supplied with a reset signal and stops its time-limited operation while the reset signal is supplied, and when the abnormal signal is output while the stop operation permission signal is output; Preventing the supply of the second reset signal to the second timer circuit and causing the second timer circuit to perform a time-limiting operation when the third reset signal is supplied to the second timer circuit.
a timer control circuit that allows the second reset signal to be supplied to the timer circuit; and a timer control circuit that allows the supply of the second reset signal to the timer circuit of A reset I-circuit for supplying a reset signal is provided. In addition to the circuit that automatically outputs an abnormal signal by detecting engine oil pressure, cooling water temperature, fan belt abnormality, or load abnormality, the above abnormal signal output circuit includes Also included is a circuit that outputs an abnormal signal when the pushbutton switch is closed. The term "signal" in the above configuration is not a voltage or current signal (), but includes a signal given by the on-state or off-state of the electrical switch means. [Operation of the invention] In the above configuration, the operation time limit of the first timer circuit is
After the engine has started and the power to the starter motor has been disconnected (after the key switch has been returned from the starting state to the on state)
, is set to be approximately equal to or slightly longer than the time required for the oil pressure of the engine to rise to a normal value. The operating time limit of the second timer circuit is the time 1 required for the engine to actually stop after the fuel supply to the engine is stopped.
J is set to be approximately equal to or slightly longer than the time. When a key switch attached to a device driven by an engine (vehicle, agricultural equipment, civil engineering machine, engine generator, engine welding machine, etc.) is turned on, the first timer circuit starts timed operation. Then, a set signal is supplied to the second timer circuit. The abnormality signal output circuit detects the engine's lubricating oil pressure (oil pressure), engine cooling water temperature (water temperature), etc., and outputs an abnormality signal when the oil pressure, water temperature, etc. are in an abnormal state. . Before the engine is started, the oil pressure is low, so an abnormal signal is output from the abnormal signal output circuit that detects the oil pressure. During this period, the first timer circuit does not output the stop operation permission signal, so the timer control circuit allows the second reset signal to be supplied to the second timer circuit. Therefore, the second timer circuit has stopped its timed operation, and no excitation command signal is supplied to the actuator drive circuit. Since the actuator is not energized at this time, when the key switch is switched to the starting state and the starter motor is energized, fuel is supplied to the engine and the engine starts. When the key switch is switched to the start condition, the reset circuit supplies a reset signal to the first timer circuit to overturn the first timer circuit.
The timer circuit interrupts the timed operation and returns to the original state. When the engine starts and the key switch is turned back on, the first
The timer circuit starts timing operation again. After the engine starts, when the timed operation of the first timer circuit ends, the first timer circuit outputs a stop operation permission signal. At this time, the oil pressure of the engine is normal, so the timer control circuit allows the second nozzle cell 1~ signal to be supplied to the second timer circuit, and the second timer circuit does not output the excitation command signal. in a state. Therefore, the actuator is not energized, fuel is normally supplied to the engine, and the engine is maintained in a normal operating state. If an abnormal phenomenon such as a drop in oil pressure or abnormal water temperature 1-stomach snow occurs during engine operation, the abnormal signal output circuit outputs an abnormal signal. At this time, the first timer circuit has already finished its timed operation and is outputting the stop operation 1' [OK R], so when the abnormal signal is output, the timer control circuit The second reset signal is prevented from being supplied to the second reset signal. The second timer circuit therefore begins a timed operation and provides an excitation signal to the drive circuit that drives the actuator. This energizes the actuator and blocks the supply of fuel to the engine. Therefore, the engine is stopped, and the engine is prevented from being damaged or its auxiliary equipment becoming unusable due to the continuation of the abnormal condition. When the timed operation of the second timer circuit ends, the supply of the excitation command signal is stopped, so that the drive circuit de-energizes the actuator to prevent the actuator coil from burning out. Further, in order to arbitrarily stop the engine during normal operation, when the key switch is turned off, the second timer circuit performs a timed operation and supplies an excitation command signal to the drive circuit for a predetermined period of time. Therefore, the actuator is energized for a certain period of time to stop supplying fuel to the engine, and during this time the engine is stopped. After a certain period of time has elapsed, the actuator becomes de-energized and the fuel supply control means is brought into a fuel supply permission state. Therefore, while the engine is stopped, the fuel supply control means is maintained in the fuel supply permission state. As described above, the stop device of the present invention is provided with a first timer circuit that starts a timed operation when the key switch is returned from the starting state to the on state, so that the actuator is energized when the engine is started. Since this prevents the engine from starting, the engine can be started without any problems. In addition, when the engine stop device is activated, people often forget to turn off the key switch because the engine is stopped, but in the present invention, a second timer circuit is installed (-) to prevent the actuator from stopping. The actuator is energized only for a certain period of time, which prevents the actuator coil from burning out if you forget to turn off the key switch.As mentioned above, the actuator supplies and stops fuel to the engine. Conventionally, fuel supply control means for supplying and stopping fuel in cold weather (a fuel injection pump in the case of a diesel engine, and a special means for supplying and stopping fuel in the case of a gasoline engine) have been conventionally used. If moisture adheres to the fuel supply valve and the moisture freezes, the fuel supply control means will stop working when the engine is started, making it impossible to start the engine.On the other hand, in the present invention, when the engine is stopped, When a certain period of time has elapsed after the operation (when the timed operation of the second timer circuit ends), the actuator becomes de-energized and maintains the fuel supply control means in the fuel supply permission state. Even if moisture adheres and the moisture freezes, the engine can be started without any problem. [Example] The present invention will be described in detail below with reference to the accompanying drawings. Fig. 1 shows the present invention. This figure shows an example in which 1 is applied to a diesel engine. In the figure, 1 is a device driven by the engine, such as a battery mounted on a vehicle. This battery is connected to a generator driven by the engine. -C is charged via the charging circuit by the output of , which supplies the saw to a load such as a headlamp, and at the same time supplies power to each part of the circuit of the stop device of the present invention. 2 is a key switch operated by a key. It has contacts B, OFF, BR, C, and R1, and by operating the key, it changes from the OFF state where the battery output is cut off, to the preheating state where power is supplied to the preheating plug of the diesel engine, and the stop device. The on state supplies power to each part of the engine, and the starting state supplies power to the starter motor that starts the engine. When switched to the starting state, the on state is maintained, and when the key is released from the starting state. The key switch automatically returns to the on state. When this key switch is in the off state, preheating state, on state, and starting state, each contact is connected as shown in Table 1. Table 1 Table 1 above shows that in each state, the contacts marked with circles are electrically connected to each other. Reference numeral 3 denotes an actuator that operates a fuel supply control means 4 that stops or allows the supply of fuel to the engine. This actuator operates the fuel supply control means 4 using a solenoid, motor, etc. as a driving source, and allows fuel to be supplied to the internal combustion engine when it is in a non-energized state, and when it is energized, it allows fuel to be supplied to the engine. The fuel supply control means 4 is operated to stop the supply. In the case of a diesel engine, the fuel supply control means 4 is a fuel injection pump, and the fuel injection pump is generally switched between a state in which fuel supply is allowed and a state in which fuel supply is stopped by operating a lever. It looks like this. 5 is a drive circuit that drives the actuator 3, and supplies an excitation current to the actuator 3 when the excitation command signal 8Ve is input. 6 is when the oil pressure, water temperature, etc. become abnormal.
When the fan belt breaks, when the emergency button is pressed, etc.
An abnormality signal v when an abnormal situation occurs that requires stopping the engine.
This is an abnormal signal output circuit that outputs a. 7 is a first timer circuit, and this timer circuit operates when the key switch 2 is turned on (B contact and BR
When the contact is connected), a timed operation is performed, and after the timed operation ends, a stop operation permission signal VSa is output, and when the first reset signal Vr1 is given from the reset circuit 8, the stop operation permission signal is output. Stop output. Reference numeral 9 denotes a second timer circuit, and this timer circuit is configured to give an excitation command signal Ve to the drive circuit 5 only during a timed operation, and a second reset signal vr2 is supplied when the key switch 2 is in the on state. The timer operation is stopped while the reset signal Vr2 is supplied. 10 is a timer control circuit, and this control circuit supplies a second reset signal ■r2 to the second timer circuit 9 when Tsunenobu Tatsumi@Va is output while the stop operation permission signal VSa is being output. lan: The second timer circuit 9
performs a timed operation, and when the third reset signal ■r3 is supplied from the reset circuit 8, the second timer circuit 91
The second reset signal Vr2 of \ is allowed to be supplied. In this embodiment, this timer control circuit 10 includes a gate circuit 10A that outputs a set signal ES when an abnormality signal Va and a stop operation permission signal Vsa are input simultaneously, and a gate circuit 10A that outputs a set signal ES when the set signal ES is applied. and the second
A Noritsu flop circuit 10B outputs a reset signal Vr2, and is reset by being supplied with a third reset signal Vr3 when the key switch 2 is switched to the preheating state and when the key switch 2 is switched to the starting state. ing. The reset circuit 8 sets the first and third reset circuits to the first timer circuit 7 and the timer control circuit 10, respectively, when the key switch 2 is switched to the preheating state and the starting state.
supply the signal. In this embodiment, first and second timer circuits 7 and 9,
The reset circuit 8 and the timer control circuit 10 supply an excitation command signal that supplies an excitation command signal Ve to the drive circuit 5 when an abnormal signal indicating that an abnormal condition that requires stopping the internal combustion engine has occurred is output. The circuit is configured. Reference numeral 11 denotes a power supply circuit, which outputs a constant voltage when the key switch 2 is in the on state, and supplies the constant voltage to the first and second timer circuits. Referring to FIG. 2, there is shown an embodiment that embodies the configuration of FIG. 1 above. In FIG. 2, the actuator 3 includes a solenoid 3a and a plunger 3b driven by the solenoid, and one end of the solenoid 3a is grounded. In this actuator, when the solenoid 3a is energized, the plunger 3b operates a fuel supply control means (not shown) to stop the fuel supply, and when the solenoid 3a is de-energized, the plunger 3b
is restored and the fuel supply control means is brought into a fuel supply permission state. The drive circuit 5 includes a transistor 5a to which a collector is connected to the non-grounded terminal of the solenoid 3a, and the transistor 5a.
a resistor 5b connected between the base and emitter of transistor 5b, a helangistor 5d whose emitter is grounded and whose collector is connected to the base of the transistor 5a via a resistor 5G; a resistor 5f connected between the base and emitter of the transistor 5e, a resistor 5Q having one end connected to the base of the transistor 5e, and a resistor 5h having one end connected to the base of the I transistor 5d, A diode 51 whose cathode is connected to the emitter of the transistor 5a, and a diode 5j connected between the collector of the transistor 5a and the ground with its anode facing the ground side.
The anode of the diode 51 is connected to the B contact of the key switch 2 (the positive terminal of the battery 1). In this drive circuit, when the transistor 5e is in a cut-off state and the transistor 5d is conductive, a base current flows through the transistor 5a, making the transistor 5a conductive.
An excitation current is supplied to the solenoid 3a of the actuator 3 through the emitter and the resistor of the transistor 5a. The abnormal signal output circuit 6 includes an indicator lamp (a light emitting diode may also be used) 6 whose one end is connected to the BR contact of the key switch 2.
a and 6b, detection contacts 6G and 6d connected between the other ends of indicator lamps 6a and 6b and ground, respectively, and contact 6
Diodes 6e and 6f have their cathodes connected to the connection points between C and 6d and indicator lamps 6a and 6b, and their anodes are commonly connected, a diode 6q has its anode connected to the BR contact, and an emitter is connected to the cathode of diode 6q. The connected base is connected to the diode 6 through the resistor 61.
It consists of a transistor 6h connected to a common connection point of transistors e and 6f, and a resistor 6j connected between the base and emitter of the transistor 6h. Contacts 6C and 6d are contacts installed in the engine's oil valve and water temperature detectors, respectively. When the oil pressure falls below the set value, contact 6C closes, and when the water temperature exceeds the set value, contact 6d closes. Close J, ゛)
It has become. Note that if the detectors for detecting oil pressure and water temperature are non-contact type, it goes without saying that the contacts 6C and 6d are replaced with output non-contact switches (closed during normal operation) of the respective detectors. In this abnormality signal output circuit 6, when the key switch is in the on state, the oil pressure or water temperature becomes abnormal and the contact 6C
Or when 6d is closed, diode 6q is removed from battery 1.
, resistors 6j, 6i, diodes 6e or 6f, and contacts 6G or 6d, current flows through the indicator lamp 6a.
Or, 6b lights up to indicate that an abnormality has occurred in the oil pressure or water temperature. At this time, a base current flows through the transistor 6h, making the transistor conductive, and an abnormality signal is output through the emitter-collector of the transistor. Further, in this embodiment, a charging control circuit 13 is provided which receives the output of a generator 12 driven by the engine and supplies a charging current to the battery 1. Charging control circuit 1
3 is a power supply terminal 13a connected to the BR contact of the key switch 2, and an abnormality signal when the predetermined output necessary for charging the battery 1 is not supplied from the generator 12 side when the key switch 2 is in the on state. Abnormal signal output terminal 13. An indicator lamp 14 is connected between the abnormal signal output terminal 13b and ground. Therefore, when the key switch 2 is held in the on state and the engine is stopped,
Also, the fan belt that transmits engine rotation to the generator 12 and an engine cooling fan (not shown) breaks and the generator 1
2 stops outputting, the display lamp 14 lights up and an abnormality signal is output to the terminal 13b. That is, in this embodiment, the charging control circuit 13 is connected to the abnormal g output circuit 6.
forms part of. The first timer circuit 7 includes a comparator 7a, a positive phase input terminal of the comparator 7a, and a power supply input terminal t1 (a power supply circuit 1 to be described later).
A constant voltage is given from 1. ) A resistor 7C connected between the resistor 7C, etc., a capacitor 7d connected between the positive phase input terminal and the ground, a resistor 7e connected between the negative phase input terminal of the comparator and the ground, and the negative phase input terminal. and a power supply input terminal t1, and a reset transistor 7g, which has a rectifier-mitter circuit connected in parallel to both ends of a capacitor 7d with its emitter facing the ground side. A predetermined voltage is applied between the power supply terminal T1 of the comparator 7a and the ground from a power supply circuit 11, which will be described later. In this timer circuit, when a constant voltage is applied to the power supply input terminal t1, the capacitor 7d is charged at a constant time constant through the resistor 7C, thereby performing a timed operation. resistance 7
e and 7f constitute a reference voltage generation circuit, which divides the voltage applied between the power input terminal 7b and the ground and connects it to the resistor 7e.
A reference voltage Er1 is output to both ends of the . When the terminal voltage EC1 of the capacitor 7d is less than the reference voltage Er1 obtained across the resistor 7e, the output terminal of the comparator 7a is in a grounded state, and a predetermined operating time period has elapsed after charging of the capacitor 7d has started. When the terminal voltage FC1 of the capacitor 7d exceeds the reference voltage Erl, the output terminal of the comparator '7a becomes ungrounded (the stop operation permission signal VSa is output). The reset circuit 8 includes a series circuit of resistors 8a, 8b connected between the cathode of the diode 6g and ground, and a resistor 8a whose emitter is grounded and whose base is grounded. A transistor 8c connected to the connection point of transistor 8b, a resistor 8d connected between the collector of transistor 8c and the power input terminal t1, a diode 8e whose anode is connected to the collector of transistor 8C, and a diode. A resistor 8Q connected between the cathode of the diode 8e and the ground, a resistor 8h having one end connected to the cathode of the diode 8Q,
The resistor 8q consists of diodes 81 and 8j whose cathodes are commonly connected to the other end of the resistor 8h and whose anodes are connected to the contacts C and R1 of the key switch 2, respectively. The connection point 8h is connected to the base of the reset transistor 7q of the first timer circuit 7. Further, a common connection point between the diodes 8i and 8j is connected to a reset terminal R of a flip-flop circuit 10b, which will be described later. In this reset circuit 8, when the 1st and 2nd transistors are turned on, a base current is supplied to the 1st transistor 8c, and the base current of the transistor 8C/fi is passed through the resistor 8.
d and the diode 8e to prevent the base current from flowing to the reset transistor 7q. Furthermore, when the key switch is switched to the preheating state or the starting state, a base current is supplied to the transistor 7q through the diode 81 or 8j and the resistor 8h (the first reset signal V
r1), the transistor 8f becomes conductive, shorting both ends of the capacitor 7d. As a result, the charge on the capacitor d is made zero, and the first timer circuit 7 is reset (at this time, the first timer circuit 7 cannot perform a timed operation). Also, when the key switch 2 is switched to the starting state or preheating state, the diodes 8i, 8
A third reset signal Vr3 is supplied to a reset terminal of a flip-flop circuit 10B, which will be described later, through j. The second timer circuit 9 includes a comparator 9a, a resistor 9b connected between the positive phase input terminal of the comparator 9a and ground, and a capacitor 9 connected between the negative phase input terminal of the comparator 9a and ground.
c, a resistor 9d connected between the positive phase input terminal of the comparator 9a and the output terminal to of the power supply circuit 11, and a resistor 9d connected between the negative phase input terminal of the comparator and the output terminal of the power supply circuit. A resistor 9e, a transistor 9f whose collector-emitter circuit is connected in parallel to both ends of the capacitor 9C with the emitter facing the ground side, a resistor 9Q connected in parallel between the base and emitter of the transistor 9f, and a transistor 9Q connected in parallel between the base and emitter of the transistor 9f. It consists of a resistor 9h with one end connected to the base, and the other end of the resistor 9h is connected, together with the other end of the resistor 5g of the drive circuit 5, to an output terminal ◇ of a fritsub circuit 1013, which will be described later. The gate circuit 10A consists of resistors 10a and 10b, one end of which is connected to the output terminal of the comparator 7a, the other end of the resistor 10a is connected to the collector of the one-herald resistor 6h of the abnormal signal output circuit 6, and the other end of the resistor 10b is The anode is connected to the resistor 10
It is connected to the abnormality signal output terminal 13b of the charging control circuit 13 via a Zener diode 15 facing the b side and a diode 16 having its cathode facing the Zener diode side. In this second timer circuit, capacitor 9C is charged through resistor 9e to perform a timed operation. When the terminal voltage EC2 of the capacitor 9C is less than the reference voltage Er2 obtained across the resistor 9b, the comparator 9a
The output terminal of the capacitor 9C is in a non-grounded state (a state in which an excitation command signal is supplied), and the terminal voltage EC2 of the capacitor 9C is
When the reference voltage Er2 at both ends of is exceeded, the output terminal of the comparator 9a becomes grounded (a state in which the excitation command signal Ve is not supplied). The flip-flop circuit 10B, which constitutes a timer control circuit together with the gate circuit 108, includes a 1-transistor 10c whose emitter is grounded, a transistor 10d whose emitter is grounded and whose base is connected to the collector of the transistor 10C, and a transistor 10c. a resistor 10e connected between the base and emitter of the transistor 10c, a resistor 10f whose one end is connected to the base of the transistor 10c, and a transistor IO
A resistor 1 connected between the collector of C and the N source terminal t2
00, a thyristor 10h whose cathode is connected to the collector of the transistor 10d, a resistor 101 whose one end is connected to the anode of the thyristor 10h, and a thyristor 10h.
a Zener diode 10j whose cathode is connected to the anode of the resistor 10f, and the other end of the resistor 10f (reset terminal R
) is connected to the common connection point of the cathodes of the diodes 8i and 8j of the reset circuit 8, and the gate (Z terminal S) of the iris resistor 10h is connected to the connection point of the resistors 10a and 1ob of the gate circuit 7, respectively. Also, the thin end of the resistor '101 is connected to the B of the key switch 2 through the diode 6g.
The anode (output terminal ◇) of the Zener diode 10j is connected to the common connection point of the resistors 5q and 9h. The power supply circuit 11 is configured by inputting a diode 11a whose anode is connected to the key switch contact BR through a diode 6q, a capacitor 11b connected between the cathode of the diode 11a and ground, and a voltage across the capacitor 11b to maintain a constant voltage. a regulator 11G that outputs a voltage of
] Ndenzer 11b has a cathode connected to the non-grounded terminal, and consists of an IC diode 11d.
):11 ground side terminal (output terminal 1”0) is comparator 78
and 9a are connected to power supply terminals T1 and T2, respectively. Further, the output terminal to of the regulator 11c is connected to the power supply terminal t1 of the first timer circuit 7 and the power supply terminal t2 of the flip-flop circuit 10B. Next, the operation of the above embodiment will be explained. In the above embodiment, the operation time limit (capacitor) J-7d of the first timer circuit 7
Since the charging of the capacitor starts, the terminal voltage EC1 of the capacitor
exceeds the reference voltage Er1), after the engine has started and power to the starter motor has been cut off (after the key switch has been returned from the starting state to the on state), the engine oil pressure returns to the normal value. The time is set to be approximately equal to or slightly longer than the time required for the user to sit upright (for example, approximately 6 seconds). The operation time limit of the second timer circuit 9 (the time from when charging of the capacitor 9C starts until the terminal voltage of the capacitor exceeds the reference voltage Vr2) is set after the fuel supply to the engine is stopped. approximately equal to or slightly longer than the time required for the actual stop (e.g. approximately 2
5 seconds). C attached to equipment driven by an engine (vehicles, agricultural machinery, civil engineering machines, engine generators, engine welding machines, etc.)
When the key switch 2 is turned on, the power supply circuit 1
1, the first timer circuit 7 =] 7d
is charged through the resistor 7c and a timed operation is started. The abnormality signal output circuit detects the engine's lubricating oil pressure (oil pressure), engine cooling water temperature (water temperature), etc., and outputs an abnormality signal ■a when the oil pressure, water temperature, etc. are in an abnormal state. do. Before the engine is started, the oil pressure is low, so the abnormal signal Va is output from the abnormal signal output circuit that has not yet detected the oil pressure, but the first timer circuit 7 ends the timed operation. Until then, the first timer circuit 7 does not output the stop operation permission signal Vsa, so the output terminal Q of the flip-flop circuit 10B of the timer control circuit is in a non-grounded state (the relay resistors 10h and 10d are disconnected from the IM). ing)
, and a second reset signal Vr is supplied to the second timer circuit 9.
2 is allowed to be supplied. Therefore, the second timer circuit 9 has stopped its timed operation. At this time, the base is also supplied to the transistor 5e, so the transistor 5e
e becomes conductive, and the output terminal of the comparator 9a and the transistor 5
The base of d is forcibly grounded. Therefore, the transistor 5d is in a cut-off state, and since no base current flows through the transistors 1 to 5a, the transistor 5a is not conductive, and no excitation current is supplied to the transistors 1 to 5a. At this time, the fuel supply control means is in a state where it can supply fuel. When the key switch 2 is switched to the preheating state, the preheating plug is energized and the inside of the cylinder of the engine is heated.Then, when the key switch 2 is switched to the starting state and the starter motor is energized, fuel is supplied to the engine. starts. When the key switch 2 is switched to the preheating state or the starting state, the first timer circuit 7 interrupts the auxiliary operation in order to supply the reset signal Vr1 to the reset circuit 8 or the first timer circuit 7, and the charge on the capacitor 7d is It is discharged and returns to its original state. When the engine is started and the key switch 2 is turned back on, the transistor 7g is cut off, so the capacitor 7d of the first timer circuit 7 is charged again, and a timed operation is started. After the engine starts, when the timed operation of the first timer circuit ends, the comparator 7 of the first timer circuit
The output terminal of a becomes ungrounded (stop operation permission signal V
sa is output). At this time, the engine oil pressure is normal, so flip-flop circuit 1 of the timer control circuit
At 0B, the iris register 10h and 1od'b are in a cut-off state, and the second reset signal is allowed to be supplied to the second timer circuit 9. Therefore, the drive circuit 5 is in a state in which no excitation command signal is applied (transistor 5d is cut off). At this time, the actuator 3 is not excited, fuel is normally supplied to the engine, and the engine is maintained in a normal operating state. If an abnormal phenomenon such as a drop in oil pressure or abnormal water temperature occurs during engine operation, the transistor 6h of the abnormal signal output circuit 6
conducts and outputs an abnormal signal. At this point, the first timer circuit 7 has already finished its timed operation and outputs a stop operation permission signal (the output terminal of the comparator 7a is in a non-grounded state), so an abnormal signal is output. Then, a firing signal is supplied to the thyristor 10h of the control flop circuit M10B. Therefore, the thyristor 10h becomes conductive and the transistor 10d becomes conductive. At this time, the supply of base current to the transistors 9 and 5e is blocked, so both transistors 9f and 5e are cut off. Since the transistor 9f is cut off, the capacitor 9c is cut off.
Charging is started, and the timer operation of the second timer circuit 9 is started. While this timed operation is being performed, the output J of the comparator 9a
The terminal is in an ungrounded state, and the transistor 5e/)"
Since it is in the cut-off state, the transistor 5d becomes conductive, and 1-
A base current is passed through the transistor 5a. Therefore, the transistors 1 to 5a are electrically connected, and an exciting current is caused to flow through the actuator 3. This puts the fuel supply control means in a state where it prevents the supply of fuel from being stopped, and the engine stops. When the capacitor +J9 c (f) terminal voltage exceeds the M quasi-voltage Vr2 across the resistor 9b and the timed operation ends γ, the output terminal JGW of the comparator 9a becomes grounded, so the I-transistor 5 d h <Becomes cut-off state, transistor 5a
becomes blocked. Therefore, the actuator 3 becomes de-energized, and the fuel supply control means returns to a state in which it can supply fuel. The above operation stops the engine and prevents the engine from being damaged or the engine's attached equipment from becoming unusable due to the continuation of the abnormal condition. Further, after the engine has stopped, the fuel supply control means automatically returns to the state in which it allows fuel supply in preparation for starting the next engine. Furthermore, the supply of the excitation command signal is stopped upon completion of the timed operation of the second timer circuit, which prevents the actuator coil from burning out.
F is given. To stop the engine arbitrarily during normal operation, press key switch 2.
When switched to off state, transistors 1 to 9f and 5e
Since the supply of base current to is stopped, the second timer circuit 9 performs a timed operation and supplies an excitation command signal to the drive circuit 5 for a certain period of time, thereby rendering the transistors 5d and 5a conductive. Therefore, the actuator 3 is energized for a certain period of time to stop supplying fuel to the engine, and the engine is stopped during this period. . After a certain period of time has elapsed, the output terminal of the comparator 9a becomes grounded and the transistor 5d is cut off.
Transistor 5a shuts off. Therefore, the actuator 3 becomes de-energized, and the fuel supply control means is brought into a fuel supply permission state. Therefore, while the engine is stopped, the fuel supply control means is maintained in the fuel supply permission state. In the above example, since the target was diesel engine,
Although R1 is provided in the key switch 2 to switch the key switch 2 to the preheating state, when a gasoline engine is targeted, the R1 contact and the circuit connected to the contact are unnecessary. Note that, in the case of a gasoline engine, since it does not have a fuel supply control means that has a function of completely shutting off fuel like a fuel injection pump normally installed in a diesel engine, when applying the present invention, it is necessary to It is necessary to provide a special valve that constitutes the supply control means. The above embodiment is merely an example of the structure of each part of the present invention, and it goes without saying that the structure of each part of the present invention is not limited to the above embodiment. [Effect of the Invention 1 As described above, according to the present invention, the first timed operation starts when the key switch is returned from the starting state to the on state.
Since the timer circuit is provided to prevent the actuator from being excited when the engine is started, the engine can be started without any trouble. Furthermore, when the engine stop device is activated, people often forget to turn off the key switch because the engine is stopped. However, in the present invention, a second timer circuit is provided to stop the actuator when the engine is stopped. Since the actuator is energized only for a certain period of time, it is possible to prevent the actuator coil from burning if you forget to turn off the key switch. Furthermore, when a certain period of time has passed after the engine has stopped (when the timed operation of the second timer circuit has ended), the actuator becomes de-energized and maintains the fuel supply control means in the fuel supply permissible state. Even if moisture adheres to the fuel supply control means and freezes, the engine can be started without any problem. 4. Brief Description of the Drawings FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention, and FIG. 2 is a circuit diagram showing an embodiment embodying each part of FIG. 1. DESCRIPTION OF SYMBOLS 1... Battery, 2... Key switch, 3... Actuator, 4... Fuel supply control means, 5... Drive circuit, 6... Abnormal signal output circuit, 7... First 8... Reset circuit, 9... Second timer circuit, 10... Timer control circuit, 11... Power supply circuit. Procedural No. 11 Official Report (Spontaneous) May 1011, 1985 Manabu Shiga, Director General of the Patent Office Internal Combustion Engine Stop Device 3, Relationship with the Amendment Person Case Patent Applicant (134) Kokusan Denki Co., Ltd. 4, Agent Tokyo Miyakominato-ku Shinm 4-31-6 Expenditure Building 6th Floor 5, Target of Amendment February 15, 1985 Contents Attached to procedural amendment iH submitted on February 15, 1985 (1)
On page 13, line 5, ``when I did'' was corrected to ``when I did it.'' (2) On page 25, line 5, [8f1 is corrected to r 7 a, 1. (3) "and" on page 30, line 17 and page 32, line 7
Insert "transistor" after each. (4) Correct "Naru." in line 7 of page 33 to "Naru."that's all

Claims (1)

[Claims] The fuel supply control means for controlling the supply of fuel to the internal combustion engine is maintained in a fuel supply permission state when in a non-excited state to permit fuel supply, and when the fuel supply control means is energized, the fuel supply control means is set to a fuel supply stop state. a fuel supply control actuator that stops the supply of fuel when an excitation command signal is supplied; an actuator drive circuit that excites the actuator when an excitation command signal is supplied; and an abnormality signal that outputs an abnormality signal when an abnormality that requires stopping the internal combustion engine occurs. and an excitation command signal supply circuit that supplies the excitation command signal to the drive circuit when the abnormal signal is generated, the actuator, the actuator drive circuit, the abnormal signal output circuit, and the excitation command signal supply circuit. Electric power for driving the circuit is supplied from the battery via a key switch attached to the device driven by the internal combustion engine, and the key switch has at least an OFF state that cuts off the output of the battery and a power supply from the battery. In the internal combustion engine stop device, the excitation command signal supply circuit is configured to switch between an on state in which the key switch is in the on state and a starting state in which the starter motor for starting the engine is energized while maintaining the on state. a first timer circuit that performs a timed operation when the timer is switched, outputs a stop operation permission signal after the timed operation ends, and stops outputting the stop operation permission signal when a first reset signal is supplied; It is configured to give the excitation command signal to the drive circuit during a timed operation, and when the key switch is in an on state, a second reset signal is supplied, and while the second reset signal is supplied, a timed reset signal is supplied. Supplying the second reset signal to the second timer circuit when the abnormal signal is output with the second timer circuit stopping operation and the stop operation permission signal being output. a timer control circuit that allows the second timer reset signal to be supplied to the second timer circuit when a third reset signal is applied, causing the second timer circuit to perform a timed operation; An internal combustion engine stopping device comprising: a reset circuit that supplies the first and third reset signals to the first timer circuit and the timer control circuit, respectively, when a key switch is switched to a starting state.