JPS6029645Y2 - Abnormality display device for engine-driven power machinery - Google Patents

Description

[Detailed description of the invention] The present invention relates to an abnormality display device for an engine-driven power machine, and in particular, an engine-driven power machine that detects and displays an abnormality from the status of each component when the operation of the engine-driven power machine is stopped. This invention relates to an abnormality display device for type power machinery.

In recent years, in order to protect engine-driven power machines, if an abnormality such as an abnormal rise in engine cooling water temperature, a decrease in the amount of cooling water, a decrease in the amount of lubricating oil, or even a decrease in the lubricating oil supply pressure is detected, a lamp or BACKGROUND ART Devices are known that emit a warning using a buzzer or the like to notify an operator of an abnormality, or automatically stop the engine to protect the engine from serious damage such as seizure or an accident.

However, the abnormality detection method described above detects the presence or absence of an abnormality only when the engine is running, and moreover, the engine operation is detected by the voltage generated from the generator for charging the starting battery. Therefore, voltage may not be generated due to breakage of the belt that drives this charging generator, breakage of internal wiring, etc.

In such a situation, it may be falsely detected that the engine is not running, and if the drive belt is broken,
The cooling fan of the engine radiator is also not driven, resulting in an abnormal rise in engine cooling water temperature. However, as mentioned above, the engine cooling water temperature detection device does not operate due to the false detection that the engine is stopped, so the water temperature becomes abnormal. The rise could not be detected, resulting in inconveniences such as no warning by lamp or buzzer being issued, and the engine not automatically stopping.

The present invention has been developed in view of the above circumstances, and has an engine operation detection means based on the output of a battery charging generator for engine starting and the engine lubricating oil supply pressure, and a control device in which a timer is interposed in this detection means. If this control device receives either one of the detection signals from the output of the battery charging generator and the engine lubricating oil supply pressure and detects that the engine has stopped operating, it detects the other one within a predetermined time set in the timer. If a stoppage of operation is not detected, a control operation is performed to indicate the occurrence of an abnormality, and an abnormality is detected from the status of each component when the operation of the engine-driven power machine is stopped, and an abnormality is detected. To provide an abnormality display device for an engine-driven power machine that can protect the engine from serious damage such as seizure or an accident when the engine is operated next time.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an abnormality display device for an engine-driven power machine according to the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a battery charging generator for engine starting, and 9 is a lubricating oil supply pressure detection circuit (including a hydraulic pressure switch).
(hereinafter referred to as the oil pressure detection circuit).

According to the voltage generated by the battery charging generator 1 and the detected value of the oil pressure detection circuit 9, a control device 8 controls the engine to operate and notify the occurrence of an abnormality.

This control device 8 connects to the battery charging generator 1 a waveform conversion circuit 2 that appropriately shapes the waveform of the generator output A and converts the signal to enable logical operations. One input terminal of the AND circuit 5 is connected via the delay timer 3, and the first off-delay timer 14 and NOT are connected to the output terminal of the waveform conversion circuit 2.
One output terminal of the AND circuit 11 and N via the circuit 4a
The second input terminals of the AND circuit 17 are connected to each other.

The oil pressure detection circuit 9 includes a second on-delay timer 10.
The other input terminal of the AND circuit 11 is connected via the second off-delay timer 24 and the NOT circuit 4.
b to the other input terminal of the AND circuit 5 and the NAN
The first input terminals of the D circuit 17 are connected to each other.

The gates of thyristors 7.13 are connected to the AND circuits 5 and 11 through resistors R□ and R2, respectively, and when each thyristor 7.13 receives a gate current, it is ignited and the battery is discharged. The oil pressure abnormality warning lamp 6 and the charging abnormality warning lamp 12 are turned on by energization from the 10B.

On the other hand, 15a to 15C are engine cooling water temperature, cooling water amount,
Further, an appropriate number of detection circuits 15 for detecting abnormalities in various parts such as the amount of lubricating oil are connected to input terminals of a NAND circuit 16, respectively.

This NAND circuit 16 includes the third one of the NAND circuit 17.
The third input terminal of the NAND circuit 21 is connected via the NOT circuit 20.

The anodes of the thyristor 7.13 are connected to the first and second input terminals of the NAND circuit 21, and an engine stop device 23 is connected to the output terminal of the NAND circuit 21 via a drive circuit 22. has been done.

A relay circuit 18 is connected to the output terminal of the NAND circuit 17, which operates to rotate the starter motor 19 by turning on a drive switch (not shown) when the output is at H level.

By the way, concrete examples of the detection circuits 15a to 15c are shown in FIGS. 2 and 3.

In Fig. 2, the circuit closing switch SW□ and the resistor R connected to the anode of the battery 10B are connected to the engine start switch.
A normally open abnormality detection switch SW2 is connected through the terminal 3, and the cathode of the battery 10B is connected to this abnormality detection switch SW2.

An abnormality alarm lamp 32 and a thyristor 33 connected in series are connected in parallel to this battery 10B and the circuit closing switch SW1.

Also, NO is connected to the connection point between resistor R3 and abnormality detection switch SW2.
The gate of the thyristor 33 is connected through the T turn 35 and the resistor R1, and the thyristor 33 and the abnormality alarm lamp 3 are connected.
Output terminals T1 to T3 are drawn out from the connection point with 2.

When the abnormality detection switch SW2 detects an abnormality and performs a closing operation, the input of the NOT circuit 35 becomes L level, so the gate of the thyristor 33 becomes H level and operates,
As a result, the abnormality alarm lamp 32 lights up, and at the same time, L level is output to the output terminals T□ to T3.

The detection circuit 15 shown in FIG. 3 uses a normally closed abnormality detection switch SW3, and also uses a normally closed abnormality detection switch SW3.
and resistor B3 are connected to the gate of thyristor 33.

When the abnormality detection switch SW3 detects an abnormality, it opens and opens, so that the gate of the thyristor 33 becomes H level and operates, causing the abnormality alarm lamp 32 to light up and at the same time output terminals T1 to T3 are set to L level. is now output.

It should be noted that each of the circuits and devices described above is configured to receive power from the starting battery.

It is also possible to provide a buzzer for each abnormality warning lamp.

In the above configuration, the operation in a normal state without any abnormality will be explained first. If there is no abnormality before the engine starts, the output of each detection circuit 15 is at H level, so the output of NAND circuit 16 is at L level. It has become.

On the other hand, since the battery charging generator 1 does not produce output A,
Since the output B of the waveform conversion circuit 2 is at the L level and the lubricating oil supply pressure to the engine has decreased, the abnormality display section 9
The output F of is also at the L level, and each output B, F passes through the first and second off-delay timers 14, 24, respectively, and outputs HL/ /< /L/I, at the NOT circuits 4a, 4b.
The signal is inverted to D and input to the NAND circuit 17.

Therefore, the output of the NAND circuit 17 becomes H level and is supplied to the relay circuit 18, and when a starting switch (not shown) is turned on, the relay circuit 18 is activated to start the starting motor 19.
is rotated, thereby operating the engine.

After the engine is started, the output A of the battery charging generator 1 increases as shown in FIG. After the predetermined time T15ec has passed, the output C of the first on-delay timer 3 becomes H level and AN
It is input to the D circuit 5.

Further, the H level output B of the waveform conversion circuit 2 passes through the first off-delay timer 14, is inverted by the NOT circuit 4a, becomes the L level D, and is input to the AND circuit 11 and the NAND circuit 17.

On the other hand, the oil pressure detection circuit 9 assumes that the oil pressure feeder is normal, as shown in FIG. 4E, the oil pressure gradually increases after the engine is started and reaches a predetermined oil pressure value. Accordingly, after a predetermined period of time has passed after the engine starts operating, the output F becomes H level.

In the second on-delay timer 10, when a predetermined time Tl5eC has elapsed after the output F became H level, the output becomes H level and is input to the AND circuit 11.

Further, the output F of the oil pressure detection circuit 9 passes through the second off-delay timer 24, is inverted to the L level (■) by the NOT circuit 4b, and is input to the AND circuit 5 and the NAND circuit 17.

Therefore, even if the outputs C, G of the first and second on-delay timers 3, 10 are at H level, the outputs (2), D of NOT circuits 4a, 4b are at L level.
The outputs J and K do not reach the H level, and as a result, the thyristor 7.13 does not operate, and accordingly, neither the oil pressure abnormality warning lamp 6 nor the charge abnormality warning lamp 12 lights up.

On the other hand, in a normal state, the output of the detection circuit 15 that detects the engine cooling water temperature, cooling water amount, etc. is at H level, so N
The output of the AND circuit 16 becomes L level and input to the NAND circuit 17, and at the same time, it is inverted to H level by the NOT circuit 20 and then input to the NAND circuit 21 as well.

Another input I of the NAND circuit 17. Since D is also at the L level as described above, the output of the NAND circuit 17 is at the H level and is supplied to the relay circuit 19 in the same manner as described above.

On the other hand, since the thyristor 7.13 is not operating and the output of the NAND circuit 16 is also at L level, the NAND
All the inputs of the D circuit 21 are at H level, so the N
Since the output of the AND circuit 21 is at L level, the drive circuit 2
2 does not operate, and accordingly, the engine stop device 23 also does not operate, and the engine continues to operate.

In the normal state as described above, when the engine is operated, each output A to ■ changes as shown in Fig. 4, and the output J of the AND circuit 5 is J=C-I, but the NOT circuit 4b and the first on-delay timer 3, there is no region where both the outputs C and I are at H level, so the output J
remains at L level.

On the other hand, although the output of the AND circuit 11 is DG-G, the NOT circuit 4a and the second on-delay timer 1
There is no region where both the output and G are at H level due to 0, and the output remains at L level.

As a result, the alarm lamp 6.12 does not light up since both the thyristors 7.13 are in the extinguished state.

Next, if the battery charging generator drive belt is cut or the generator connection is disconnected, the output A of the generator 1 will be
As shown in the figure, the output B of the waveform converting circuit 2 drops abnormally and becomes L.
level, and as a result, the first on-delay timer 3
The output C of the NOT circuit 4a immediately goes to L level, and the output of the NOT circuit 4a is set to the L level for a predetermined time T2 by the first off-delay timer 14.
It becomes H level after sec has elapsed.

In this case, the output E-I remains unchanged as described above.

Therefore, the inputs of the AND circuit 11 and G are both high after the set time Lsec of the first off-delay timer 14 has elapsed.
level, the output K changes to H level, and accordingly, the thyristor 13 is fired, so that the charging abnormality warning lamp 12 lights up to notify an abnormality in the charging system.

At this time, since one input C of the AND circuit 5 is at the L level or the other input (2) is at the L level, the thyristor 7 does not fire.

Furthermore, if the output A of the battery charging generator 1 is normal, but the lubricating oil supply pressure to the engine becomes abnormal and decreases as shown in FIG. 4E, the pressure F of the oil pressure detection circuit 9 becomes L level. .

Accordingly, when the output I of the NOT circuit 4b is set in the second off-delay timer 24 and elapses after w2SeC, it becomes H level and is input to the AND circuit 5, and the other input C of the AND circuit 5 is also at H level, its output J changes to H level and thyristor 7 fires,
The oil pressure abnormality warning lamp 6 lights up to notify the oil pressure abnormality.

In this case, since the input G of the AND circuit 11 is at the L level, the thyristor 13 does not fire, and the charging abnormality warning lamp 1
Of course, 2 does not light up.

Further, when at least one of the various abnormality detection circuits 15 detects an abnormality, the output of the corresponding abnormality detection circuit 15 becomes L level.

That is, in the abnormality detection circuit 15 as shown in FIG. 2, when an abnormality is detected, the abnormality detection switch SW2 closes, so the input of the NOT circuit 35 becomes L level, and accordingly, its output becomes H level. As a result, the thyristor 33 fires and the abnormality warning lamp 32 lights up.

Therefore, the output terminals T1 to T3, which are at H level during normal operation, change to L level as the abnormality detection switch SW2 is closed.

In the abnormality detection circuit 15 as shown in FIG. 3, when an abnormality is detected, the abnormality detection switch SW3 opens.
The gate of the thyristor 33 becomes H level and fires, so that the abnormality alarm lamp 32 lights up.

Along with this, the output terminals T1~ which are at H level under normal conditions.
T3 changes to L level.

As mentioned above, when any one of the various abnormality detection circuits 15 detects an abnormality, its output changes to L level, and as a result,
Since the output of the NAND circuit 16 goes to H level and is input to the NAND circuit 17, the output of this NAND circuit 17 goes to L level and is supplied to the relay circuit 18, so that it can be started even by turning on the starting switch (not shown). The electric motor 19 is not driven to rotate, and the engine does not operate.

If any of the abnormality detection circuits 15 detects an abnormality during engine operation and the output becomes L level, the NAND circuit 1
The output of 6 changes to H level, and the NOT circuit 20 changes to L level.
After the level is inverted, the signal is supplied to the NAND circuit 21, or when either the battery charging generator 1 or the oil pressure detection circuit 9 detects an abnormality as described above, the corresponding thyristor 7
．． Since the anode of 13 is at L level, NAND
The output of the circuit 21 becomes H level, and the drive circuit 22 drives the stop device 23, thereby stopping the operation of the engine.

By the way, in a normal state without any abnormality, when the engine is manually stopped at the end of the work, as shown in FIG. After the lubricating oil supply pressure of the engine drops to a predetermined value and the time set in the first and second off-delay timers 14.24 elapses, the level changes to H level and the output decreases. is connected to the AND circuit 11 and the NAND circuit 17, and the output ■ is connected to the AND circuit 5.
and the NAND circuit 17, respectively.

In this case, it goes without saying that the lubricating oil supply pressure to the engine gradually decreases compared to the output A of the battery charging generator 1.

On the other hand, the outputs C and G of the first and second on-delay timers 3.10 are L level signals that are ANDed at the same time that the output A of the battery charging generator 1 and the output F of the oil pressure detection circuit respectively become L level. Input to circuit 5.11.

As a result, in the normal state, the input C of each AND circuit 5, 11
, I and input.

Since there is no time range in which G is both at the H level, and therefore the thyristor 7.13 is about to fire, the charge and oil pressure abnormality warning lamp 6.12 does not light up.

In this state, the output of the NAND circuit 17 is at H level, and the starting motor 19 can be driven to rotate the next time the starting switch is turned on.

In addition, if an abnormality occurs in either the battery charging system or the hydraulic system, engine operation stoppage is not detected from the abnormal system within the set time T2SeC of the first and second off-delay timers 14.24. Therefore, the abnormality warning lamp 6.12 corresponding to this system lights up to notify the occurrence of an abnormality.

For example, to explain the case where an abnormality has occurred in the charging system, the operation of the engine is stopped and the output F of the oil pressure detection circuit 9 becomes L level, and after this output F reaches L level, the second OFF switch is activated. Time Tz set in delay timer 24
In SeC, for some reason as shown by the dashed line in FIG. 4, the output A of the battery charging generator 1, that is, the output C of the first on-delay timer 3 does not change to the L level.
Assume that the state of H level continues.

Therefore, when setting the second off-delay timer 24, fJr2
After sec has elapsed, the input ■ changes to H level, and as a result,
The output of the AND circuit 5 becomes H level, ignites the thyristor 7, and thereby the abnormality warning lamp 6 lights up to notify an abnormality.

In addition, if there is an abnormality in the hydraulic system, the operation of the engine is stopped and the output A of the battery charging generator 1 becomes L level, and after this output A1, that is, the output B of the waveform conversion circuit 2 becomes L level. When setting the first off-delay timer 14
Within 2SeC, as shown by the two-dot chain line in Fig. 4, the engine lubricating oil supply pressure did not decrease due to some reason, and the output F of the oil pressure detection circuit 9 did not change to the L level but reached the H level. Assume that the condition continues.

Therefore, when setting the first off-delay timer 14 [r2
Since the input changes to H level after sec has elapsed, A
The output of the ND circuit 11 becomes H level and the thyristor 13
The abnormality warning lamp 12 lights up to notify an abnormality.

In FIG. 5, a lamp check circuit 37 is attached to each of the detection circuits 15a to 15c, and the anode of a diode 36 is connected to each output terminal T1 to T3, and the cathode of each diode 36 is connected to a transistor Q□. Connect to the collector of

The emitter of this transistor Q1 is connected to each detection circuit 15.
It is grounded to be connected to the cathode of battery 10B of batteries a to 15c.

On the other hand, the base of the transistor Q1 is connected to the circuit closing switch S.
W1, that is, when the engine start switch is turned on, the transistor current source +B is connected via the check switch SW, which closes or operates for a predetermined period of time, for example, about 3 seconds.
Connect t.

When the start switch (not shown) is turned on, each detection circuit 15a
The circuit closing switch SW1 of ~15c is closed, and the check switch SW4 is closed for a predetermined time from this closing time.

Then, the base current is supplied from the transistor current source +Bt to the transistor Q, turning it on, and thereby the batch +) of each detection circuit 15a to 15cb is switched on from the circuit closing switch SW1, the abnormality alarm lamp 32, and the diode 3.
6 to the transistor Q1, and then is energized so as to flow to ground, and the abnormality alarm lamp 32 is lit for a predetermined period of time.

After the predetermined time has elapsed, the check switch SW4 is opened, so the transistor Q1 is turned off, and as a result, each abnormality warning lamp 32 is turned off.

By the way, if the abnormality alarm lamp 32 is damaged such as filament breakage, the corresponding abnormality alarm lamp 32 will not light up even if the check switch SW4 is closed, so please check the damage to the abnormality alarm lamp 32 before using it. It is extremely convenient to discover malfunctions.

Furthermore, if an abnormality occurs in the engine lubricating oil amount, cooling water amount, etc. as described above, the corresponding detection circuits 15a to 15b
Since the abnormality detection switch SW2 is closed or the abnormality detection switch SW3 is opened, the thyristor 33 is fired.

Therefore, even when the check switch SW4 is opened, only the abnormality warning lamps 32 of the detection circuits 15a to 15c that detect abnormalities continue to light up, making it easy to detect abnormalities in each part of the power machine before starting the engine. be able to.

On the other hand, as mentioned above, when the check switch SW4 is closed, each of the detection circuits 15a to 15c does not detect any abnormality, and the abnormality warning lamp 32 does not malfunction and the other signals A and F are at the L level. , the output of the NAND circuit 16 shown in FIG. 1 goes to the H level for a predetermined period of time, and the output of the NAND circuit 17 goes to the L level accordingly, making it impossible to start the starting motor 19, and the output of the NAND circuit 21 goes to the H level. When the level becomes H, the engine stop device 23 operates and the engine becomes unable to start.

In this case, there is a problem that at least the engine stop device 23 is operating when the check switch SW4 is closed, so the output of the NAND circuit 16 is not passed during the closing operation time of the check switch SW4, and the L level is A timer circuit is inserted in front of the NOT circuit 20 to hold the output of the NAND circuit 16 and to pass the output of the NAND circuit 16 as is after a predetermined period of time has elapsed.

As described above, according to the abnormality display device for an engine-driven power machine according to the present invention, there is no output from the engine starting battery charging generator or the engine lubricating oil supply pressure is low when starting the engine and during engine operation. When the voltage falls below a predetermined value, not only can the charging abnormality display section or oil pressure abnormality display section display an abnormality, but since it has an off-delay timer and an on-delay timer, the charging voltage can be reduced by the control operation of the regulator. Even if there is a fluctuation in each detection signal such as fluctuation that is not caused by an abnormality occurrence, the charging abnormality display section or oil pressure abnormality display section will not blink, and even when the engine is stopped, it will not blink when the engine is started or while the engine is running. You can easily discover abnormalities that cannot be detected, such as the engine lubricating oil supply pressure not decreasing for some reason even after the engine has stopped.
Not only is it extremely convenient for maintenance management for the next operation, but even when the engine is stopped, the charging error display section or oil pressure error display section that corresponds to the abnormal location operates to accurately display the abnormal location, and there is no off-delay. The display operation is stable due to the timer, on-delay timer, and non-contact circuit.

[Brief explanation of the drawing]

The drawings show an embodiment of the abnormality display device for an engine-driven power machine according to the present invention, and FIG. 1 is a block diagram thereof, and FIG. 2 is a block diagram thereof.
The figure shows a specific example of the detection circuit, Figure 3 is a circuit diagram showing another example of the detection circuit, Figure 4 is a time chart of the abnormality display device in Figure 1, and Figure 5 is the detection circuit. FIG. 4 is a circuit diagram showing another embodiment in which a lamp check circuit is added to the device. 1...Battery charging generator for engine starting, 2
...Waveform conversion circuit, 3...First on-delay timer, 4 a, 4b, 20.35...
-NOT circuit, 5.11...AND circuit, 6,
12, 32... Abnormal alarm lamp? , 13.3
3... Thyristor, 8... Control device,
9... Oil pressure detection circuit, 10... Second on-delay timer, 14.mamma first off-delay timer, 15... Detection circuit, 16, 17.
21...NANDAND circuit...Relay circuit, 19...Starting motor, 22...
- Drive circuit, 23...Engine stop device, 24
...Second off-delay timer, R1-R4.
...Resistor, SW, ~SW3...Switch, B...Battery, T□~T3...Output terminal.

Claims (1)

[Scope of utility model registration request] It has an output detection means for detecting the output of the battery charging generator for engine starting, and a pressure detection means for detecting the engine lubricating oil supply pressure, and a charging abnormality display section is connected to the output detection means via an off-delay timer. At the same time, an oil pressure abnormality display section is connected to the pressure detection means via an off-delay timer, and an on-delay timer is inserted between the output detection means and the oil pressure abnormality display section. An on-delay timer is inserted between the charging abnormality display section and the hydraulic pressure abnormality display section, and the charge abnormality display section and the hydraulic pressure abnormality display section are comprised of a logic circuit that performs an display operation when only one of the detection signals from the output detection means and the pressure detection means is received. An abnormality display device for an engine-driven power machine, characterized by: