JPS61187549A - Internal-combustion engine controller - Google Patents

Abstract

PURPOSE:To improve the starting performance of an engine in cold state by feeding fuel after the temperature inside a cylinder is increased by carrying-out engine cranking when the engine is started. CONSTITUTION:An actuator 3 for operating a fuel-feed controlling means 4 (fuel injection pump in case of Diesel engine) is drive-controlled by an actuator control circuit A, which is equipped with an actuator driving circuit 5, abnormal- signal output circuit 6, the first and the second timer circuits 7 and 9, reset circuit 8, timer control circuit 10, and a power-source circuit 11. In this case, a cranking circuit 12 for controlling the actuator 3 is provided so that the fuel-feed control means 4 is put into the fuel-feed suspension state when an engine is started, and the fuel-feed control means 4 is put into the fuel-feed allowable state after the engine ranking.

Description

Detailed Description of the Invention [Industrial Field of Application J The present invention relates to an internal combustion engine control device that allows or stops the operation of an internal combustion engine by controlling the supply of fuel to the internal combustion engine using an actuator. It is related to.

[Summary of the Invention] The present invention provides an internal combustion engine control device that allows or stops the operation of an internal combustion engine by controlling the supply of fuel to the internal combustion engine using an actuator. By controlling the actuator to allow fuel supply after the engine has been cranked, the startability of the engine can be improved.

[Conventional technology] The pressure of the lubricating oil of the internal combustion 11 [11 (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 belt that drives the fan that cools the engine breaks, etc., immediately stop the engine. It is necessary to stop the system for inspection and repair.

Therefore, an actuator that operates a fuel supply control means that controls the supply of fuel to the internal combustion engine and an actuator control circuit that controls the actuator are provided, and when the engine is operated, the fuel supply control means is set to a fuel supply permission state, and the engine is operated. An internal combustion engine control device has been proposed in which the engine can be stopped in the event of an abnormality by setting the fuel supply control means to a fuel supply stop state when it becomes necessary to stop the engine.

[Problems to be solved by the invention] In conventional internal combustion engine control devices, fuel is supplied to the engine from the beginning when the engine is started, so the startability of the engine in cold weather is affected. Unfortunately, there was a problem in that unburned gas was emitted during startup.

An object of the present invention is to provide an internal combustion engine control device that can improve engine starting time.

[Means for Solving the Problems] As shown in FIG. 1 showing an embodiment of the present invention, the present invention includes an actuator 3 that operates a fuel supply control means 4 that controls the supply of fuel to an internal combustion engine. , an actuator control circuit A that controls the actuator so that the twist 1 supply control means is in a fuel supply permission state when operating the internal combustion engine, and the fuel supply control means is in a fuel supply stop state when the internal combustion engine is stopped; In the internal combustion engine control device, the actuator control circuit brings the fuel supply control means 4 into a fuel supply stop state at the start of the internal combustion engine starting operation, and after cranking of the internal combustion engine is performed, the fuel supply control means 4 The present invention is characterized in that it includes a cranking circuit 12 that controls the actuator 3 to allow fuel supply.

[Operation 1 of the invention] As described above, when the cranking circuit 12 is provided, the actuator 3 is connected to the fuel supply control means 4 when starting the engine.
Since the fuel supply is stopped, the engine is cranked by the starter motor without fuel being supplied to the engine. Once the engine has been cranked to a certain extent,
Since the actuator 3 puts the fuel supply control means 4 into the fuel supply permission state, fuel is supplied to the engine. At this time, the inside of the cylinder of the engine is heated by the heat generated by the compression of air during cranking, and the fuel is easily ignited, so the engine starts immediately after the fuel is supplied.

As described above, according to the present invention, when the engine is started, the engine is cranked to increase the temperature inside the cylinder and then fuel is supplied, thereby improving the startability of the engine even in cold weather. This can prevent unburned gas from being discharged.

Although the invention is particularly suitable for deep-pill engines, it can also be applied to gasoline engines.

[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 diesel 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 control 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 switch from the OFF state where 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 control 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 engine, and when switched to the starting state, the off 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, OFF 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.

In FIG. 1, 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 fuel supply. In the case of a diesel engine, the fuel supply control means 4 is a fuel injection pump,
Generally, a fuel injection pump can be switched between a state in which fuel supply is permitted and a state in which fuel supply is stopped by operating a lever.

Reference numeral 5 denotes an actuator drive circuit that drives the actuator 3, and supplies an excitation current to the actuator 3 when the excitation command signal Ve is input.

6 is an abnormal signal output circuit that outputs an abnormal signal va when an abnormal situation occurs that requires the engine to be stopped, such as when the oil pressure, water temperature, etc. become abnormal, when the fan belt breaks, when the emergency button is pressed, etc. It is.

7 is a first tine circuit, and this timer circuit is activated 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 outputted. Stop outputting.

Reference numeral 9 designates a second timer circuit, and this timer circuit is configured to send an excitation command signal ve to the drive circuit 5 only when the key switch 2 is in operation, and sends a second reset signal when the key switch 2 is in the on state. Vr2 is supplied and the reset signal Vr2
The timed operation will be stopped while the current is being supplied.

10 is a timer control circuit, and this control circuit supplies the second reset signal ■r2 to the second timer circuit 9 when the abnormality signal Va is output while the stop operation permission signal j3Vsa is output. The third reset signal Vr3 is supplied from the reset circuit 8, and the second reset signal Vr2 is supplied to the second timer circuit 9 at 1,+i. 51 volumes. In this embodiment, the timer control circuit 10 is provided with the set signal Es and the circuits 1 to 10Δ that output the set signal ES when the abnormality signal Va and the stop operation permission signal Vsa are input simultaneously! When the key switch 2 is set to the preheating state and when the key switch 2 is switched to the starting state, the third reset signal Vr3 is supplied and reset. It consists of a flip-flop circuit 10B.

The reset circuit 8 supplies first and third reset signals 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.

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.

124 is a cranking circuit which is a characteristic part of the control device of the present invention, and this cranking circuit puts the fuel supply control means into a fuel supply stop state at the start of a starting operation of the internal combustion engine, and cranks the internal combustion engine. Then, the actuator is controlled so that the fuel supply control means is placed in a fuel supply permission state.

In this embodiment, an abnormal signal output circuit 6, first and second timer circuits 7, and actuator drive circuit 6,
Reset h circuit 8, timer control circuit 10, and power supply circuit 1
1 and the cranking circuit 12, the actuator 3 is configured to cause the fuel supply control means 4 to be in the fuel supply permission state when operating the internal combustion engine, and to be in the fuel supply stop state when the internal combustion engine is to be stopped. A controlling actuator control circuit Δ is configured.

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 the fuel supply control means to stop the fuel supply, and the solenoid 3a is energized.
When a is brought into a de-energized state, the plunger t-3b returns to place the fuel supply control means in a fuel supply permitting state.

The drive circuit 5 includes a PNP transistor 5a, a resistor 5b connected between the base and emitter of the transistor 5a, a transistor 5d whose emitter is grounded and whose collector is connected to the base of the transistor 5a via a resistor 5C, and whose emitter is grounded. 1 to 5e whose collectors are connected to the base of the transistor 5d, and the transistor 5e.
A resistor 5f is connected between the base and the emitter, a resistor 5q has one end connected to the base of the transistor 5e, a resistor 5h has one end connected to the base of the transistor 5d, and a cathode is connected to the emitter of the transistor 5a. and a diode 5 connected between the collector of the transistor 5a and the ground with the anode facing the ground side.
j, and a diode 5 whose anode is connected to the collector of the transistor 5a, and the diode 51
The anode of the diode 5 is connected to the 8 contacts of the key switch 2 (the positive terminal of the battery 1), and the cathode of the diode 5 is connected to the non-grounded terminal of the solenoid 3a of the actuator 3.

In this drive circuit, when the transistor 5e is in a cut-off state and the I transistor 5d is conductive, a base current flows through the transistor 5a, making the transistor 5a conductive, and when the transistor 5a is conductive, the battery 1
to the solenoid 3a of the actuator 3 between the emitter and collector of the transistor 5a and through the diode 5k.
An excitation 1 afff flow is supplied to the .

The abnormality No. 11 output circuit 6 is an indicator lamp (a light emitting diode may also be used), one end of which is connected to the SR contact of the key switch 2.
6a and 6b, detection contacts 6C and 6d are connected between the other ends of indicator lamps 6a and 6b, and ground, and cathodes are connected to the connection points between contacts 6C and 6d and indicator lamps 6a and 6b, respectively, and anodes are connected to the terminals. Diodes 6e and 6f are commonly connected, a diode 6q has its anode connected to the BR contact, and the emitter of the diode 6q is connected to its cathode, and its base is connected to the common connection point of diodes 6e and 6f via a resistor 61. It consists of a PNPI transistor h and a resistor 6j connected between the pace emitter of a transistor 6h. Contacts 6C and 6d
are contacts provided on the detectors that detect the oil pressure and water temperature of the engine, respectively, and when the oil pressure falls below the set value, contact 6C
is closed, and when the water temperature exceeds a set value, the contact 6d closes. 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 the output non-contact switches of the respective detectors (in this example, they close in the event of an abnormality).

In the 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 60 from battery 1
．． A current flows through the resistors 6j and 61, the diode 6e or 6f, and the contact 6C or 6d, and 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, charging current is supplied to the battery 1 using the output of the generator G driven by the engine as input.
A charging control circuit 13 is provided. Charging control circuit 1
3 is a power supply terminal 13a connected to the BR1a point 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 G side when the key switch 2 is in the on state. An indicator lamp 14 is connected between the abnormal signal output terminal 13b and the 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 G and the engine cooling fan 1 (not shown) breaks and the generator 12 stops outputting, the indicator lamp 14 lights up and an abnormality signal is output to the terminal 13b. That is, in this embodiment, the charging control circuit 13 constitutes a part of the abnormality signal output circuit 6.

The first timer circuit 7 includes a resistor 7C connected between the positive phase input terminal of the comparator 7a and a power supply input terminal tl (to which a constant voltage is applied from a power supply circuit 11 described later), such as a comparator 7a. , a capacitor 7d connected between the positive phase input terminal and ground, a resistor 7e connected between the negative phase input terminal of the comparator and ground, and a connection between the negative phase input terminal and power input terminal t1. and a relet NPN transistor 7g 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 7, when a constant voltage is applied to the power supply input terminal t1, the capacitor 7d is charged through the resistor 7C at a constant time constant, 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 Er1 is output to both ends of e. When the terminal voltage EC1 of the capacitor 7d is less than the base Q 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. I'E for terminal of capacitor 7d
When Ecl exceeds the reference voltage Er1, the output terminal of the comparator 7a becomes ungrounded (stop operation permission + TJ signal Vs
a is output).

The reset circuit 8 includes a series circuit of resistors 8a and 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 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 a diode 8o, 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. and a resistor 8CI.

The connection point 8h is connected to the base of the reset transistor 7g of the first timer circuit 7. Further, a common connection point of the cathodes of 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 key switch 2 is turned on, a base current is supplied to the transistor 8C, the transistor 8C becomes conductive, and the base current flows to the reset transistor 7q through the resistor 8d and the diode 8e. to prevent Furthermore, when the key switch is switched to the preheating state or the starting state, the base current is supplied to the transistor 7q through the diode 81 or 8j and the resistor 8h (the first reset signal Vr1 is supplied), so that the transistor 8f becomes conductive. Then, both ends of the capacitor 7d are short-circuited. This allows content 1 noa d
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, a third reset signal ``r3'' is supplied to a reset terminal of a flip-flop circuit 10B, which will be described later, through diodes 8i and 8j.

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, the positive-phase input width of the comparator 9a: the resistor 9d connected between the child and the output terminal to of the power supply circuit 11, and the negative-phase input terminal of the comparator and the output terminal of the power supply circuit. A resistor 9c is connected, a transistor 9f is connected in parallel to both ends of the collector-emitter circuit with the emitter facing the ground side, and a resistor 9q is connected in parallel between the base and emitter of the transistor 9f. , 1 - transistor 9
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.
It is connected to the.

The gate circuit 10A consists of resistors 10a and 10b, one end of which is connected to the output terminal of the comparator 7a, and 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 (l!!) of the resistor 1ob. Q is connected to the abnormality signal output terminal 13b of the charging control circuit 13 via a Zener diode 15 with its anode facing the resistor 10b and a diode 16 with its cathode facing the Zener diode.

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 base Q 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).
, the terminal voltage EC2 of capacitor +I9C is
When the voltage exceeds the reference voltage Er2 at both ends of , the output terminal of the comparison 59a 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, is connected between 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 10G, and the base-emitter of the transistor 10C. a resistor 10e connected to
A resistor 10 connected between the collector of and the power supply terminal t2
g, a thyristor 10h whose cathode is connected to the collector of the transistor 10d, and a resistor 101 whose one end is connected to the anode of the 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 1 to circuit 8, and the goo 1-(
The set terminal S) is connected to the resistors 10a and 10 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 SR 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 5 (j, 9h).

The power supply circuit 11 has 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 the ground, and a constant voltage using the voltage across the capacitor 11b as input. a regulator 11C that outputs
and a diode 11d whose cathode is connected to the non-grounded 1llII terminal of the capacitor 11b.
The non-grounded terminal (output terminal TO) of 1b is connected to power supply terminals T1 and T2 of comparators 7a and 9a, 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 flip-flop circuit 10.
It is connected to the power supply terminal t2 of B.

The cranking circuit 12 includes a switch means 12a and a switch iil control means 12b for controlling the switch means. One end of the switch means 12a is connected to the non-grounded terminal of the solenoid 3a of the actuator 3, and the other end is connected to the contact C of the key switch 2.

Before the starting operation is performed, the switch control means 12b
For example, when the key switch 2 is switched to a preheating state or an on state and contacts B and BR are connected, or when the key switch 2 is switched to a starting state, the switch means 12
The switch means 12a is controlled so as to close the switch means 12a and open the switch means 12a after the starter motor has been cranked to some extent.

As the switch means 12a, for example, a semiconductor switch such as a transistor, a relay, or the like can be used.

For example, the switch control means 12b closes the switch means 12a when the key switch 2 is turned on, and closes the contact C when the key switch 2 is turned on.
A timer circuit may be used which controls the switching means 12a to start a timed operation when is connected to the contact B+'BR and to open the switch means 12a at the end of the timed operation. The switch control circuit 12b also closes the switch means 12a when the key switch is turned on.
A circuit may be used which opens the switch means 12a when it is detected that the temperature of the cylinders of the engine has reached a predetermined value.

Next, the operation of the above embodiment will be explained. In the above embodiment, the operation time limit of the first timer circuit 7 (capacitor llj'7
The terminal voltage EC of the capacitor after charging of d starts
1 exceeds the reference voltage Er1), after the engine has started and the power supply 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 is at the normal value. It is set to be approximately equal to or slightly longer than the time required to reach the upper limit (for example, approximately 6 seconds). In addition, the operation time limit of the second timer circuit 9 (capacitor 9C
The time from the start of charging until the terminal voltage of the capacitor exceeds the reference voltage Vr2) is the period of time from the start of charging to the time when the terminal voltage of the capacitor exceeds the reference voltage Vr2.

The engine is set to be approximately equal to or slightly longer than the time required for the engine to actually stop after the fuel supply to the engine is stopped (for example, about 25 seconds).

When the key switch 2 attached to an engine-driven device (vehicle, stratifier, civil engineering work machine, engine generator, engine welding machine, etc.) is turned on, the output of the power supply circuit 11 causes the Capacitor 7d of first 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 temperature (water temperature), etc., and outputs an abnormality signal Va whenever the oil pressure, water temperature, etc. are in an abnormal state. . In the state before the engine is started, the oil pressure is low, so the abnormal signal a 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 sa, so the output terminal Q of the flip-flop circuit 10[3 of the timer control circuit is in an ungrounded state (thyristors 10h and 10d are cut off). ), and allows the second timer circuit 9 to be supplied with the second set signal Vr2. Therefore, the second timer circuit 9
has stopped its timed operation. At this time, since the base is supplied to the transistor 5e again, the transistor 5C becomes conductive, forcing the output terminal of the comparator 9a and the bases of the transistors i to 5d to be grounded. Therefore, the transistor 5d is in a cutoff state, and since no base current flows through the transistor 5a, the transistor 5a is in a cutoff state.

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 is switched to the starting state, battery 1
Excitation current is supplied to the solenoid 3a of the actuator 3 through the key switch 2 and the switch means 12a of the cranking circuit 12 (the switch means 12a is closed before the key switch 2 is switched to the starting state). Therefore, the actuator 3 operates the fuel supply control means 4 to stop the fuel supply, thereby stopping the supply of fuel to the engine. When the key switch 2 is opened, the starter motor for starting the internal combustion engine is energized, so the starter motor rotates and cranks the engine. This compresses the air inside the RPA cylinder and generates heat.
Engine temperature increases. When cranking has been performed to a certain extent, the switch control means 12b opens the switch means 12a, so that power to the solenoid 3a of the actuator 3 is cut off. Therefore, the actuator 3 controls the fuel supply control 1.
1. The means 4 is returned to the fuel supply permissible state, and the fuel supply to the engine is stopped. Since the temperature of the engine has risen sufficiently due to engine cranking, the engine starts at the same time as fuel is supplied to the engine.

When the key switch 2 is switched to the preheating state or the starting state, the reset circuit 8 supplies the reset signal Vr1 to the first timer circuit 7.
11111 operation is interrupted, the charge in the capacitor 7d is discharged, and the original state is restored. The engine starts and key switch 2
When the transistor 7g is turned off, the capacitor +J7d 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 7 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 in the flip-flop circuit 10B of the timer control circuit, the thyristors 10h and 10d are 7! The second timer circuit 9 is in a disconnected 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 (the switch means 12a is open and the 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 occurs during engine operation, such as a drop in oil pressure or an abnormal water temperature, the abnormal signal output circuit 6 1 to RANGISTERO
conducts 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 the abnormal signal is When output, the 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 transistor 9f
Since the supply of base current to transistors 9f and 5e is blocked, both transistors 9f and 5e are cut off. Since the transistor 9f is cut off, the capacitor 9
Charging of C 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 ungrounded and the transistor 5e is cut off, so the transistor 5d is conductive and the base current flows through the transistors 1 to 5a.

Therefore, the transistor 5a becomes conductive, and the actuator 3
An excitation current of 1i is applied to the This causes the fuel supply control means to stop supplying fuel, and the engine stops. When the terminal voltage of the capacitor 1J9c exceeds the base voltage Vr2 across the resistor 9b and the timed operation ends, the output terminal of the comparator 9a becomes grounded, so the transistor 5d is cut off, and the transistor 5a is cut off. become a state. Therefore, the actuator 3 becomes de-energized, and the fuel supply control means returns to a state in which it can supply fuel.

The engine stops due to the above operation, and J: due to the continuation of the abnormal condition.
This prevents the engine from being damaged and engine auxiliary equipment from becoming unusable. 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 V71 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. Accordingly, the cutout 3 is energized for a certain period of time to stop supplying fuel to the engine, and during this period the engine is stopped.

After a certain period of time has elapsed, the output terminal of the comparator 9a becomes grounded 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
Although the key switch 2 is provided with a contact R1 to switch the key switch 2 to the preheating state, when a gasoline engine is targeted, the R1 contact and a circuit connected to the contact are unnecessary. In the case of the J5 gasoline engine, it does not have a fuel supply control means that has the function of completely shutting off the fuel like the fuel injection pump normally installed in the Deep Pill engine, so when applying the present invention, It is necessary to specially install the valves that constitute the fuel supply control means.

The above-mentioned embodiments merely show IM configuration examples 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 embodiments.

[Effects of the Invention] As described above, according to the present invention, when the engine is started, the engine is cranked to raise the temperature inside the cylinder before fuel is supplied, so that the engine can be started even in cold weather. This has the advantage of improving the performance and preventing unburned gas from being released.

[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... 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, cranking circuit, Δ: Actuator control circuit.

Claims (1)

[Scope of Claims] An actuator for operating a fuel supply control means for controlling the supply of fuel to an internal combustion engine; and an actuator for operating a fuel supply control means for controlling the supply of fuel to an internal combustion engine; when the internal combustion engine is operated, the fuel supply control means is set to a fuel supply permission state; when the internal combustion engine is stopped; and an actuator control circuit that controls the actuator so as to bring the fuel supply control means into a fuel supply stop state, wherein the actuator control circuit controls the fuel supply control means at the start of a starting operation of the internal combustion engine. An internal combustion engine control device, comprising: a cranking circuit that controls the actuator so that the fuel supply control means is brought into a fuel supply permission state after the internal combustion engine is cranked. .