JPS6227252B2 - - Google Patents

Description

[Detailed Description of the Invention] Power equipment such as compressors and generators used in factories or work sites are driven and controlled so that the output compressed air or electric power is responsive to demand at the factory or work site. Therefore, the motion drive frequently repeats full-load operation and no-load operation or medium-load operation, which tends to cause abnormalities in the power equipment, and stoppage due to such abnormalities leads to work stoppage in factories and work sites. , We constantly monitor the function display systems such as lubricant oil pressure and cooling water temperature of these power equipment, and issue an alarm when an abnormality occurs.
It is necessary to discover and repair the abnormality at an early stage.

In addition, the internal combustion engine that drives the compressor and generator mentioned above is also prone to abnormalities because the load condition frequently changes as the operating conditions of the compressor and generator change, and the internal combustion engine's own lubricating oil oil pressure and cooling water Abnormalities such as water temperature also require early detection and repair.

The present invention is capable of displaying abnormal conditions such as a drop in lubricating oil pressure or a rise in temperature of cooling water when abnormal conditions occur during operation of the compressor or power equipment such as the internal combustion engine that drives it. This invention relates to a device that automatically stops the operation of power equipment in an emergency and displays an abnormal state.

In the present invention, a power device refers to a device that supplies power (energy) to the outside through rotational operation and has a built-in lubricating device and a cooling device.

In order to indicate abnormalities in the internal combustion engine used to drive conventional compressors and generators,
A circuit is provided that generates signals representing the rotational speed, oil pressure, and water temperature as elements indicating the operating state of the internal combustion engine, and a signal indicating an abnormality in the oil pressure and water temperature is used as an input signal to an OR circuit, and the output signal of the OR circuit is used as an input signal. In addition to driving the internal combustion engine's stop mechanism drive circuit, an alarm generation circuit indicates an abnormality. However, when the internal combustion engine is stopped by a signal indicating an abnormality in the oil pressure, the water temperature often rises temporarily because the cooling effect disappears as the internal combustion engine stops, and therefore an alarm indicating an abnormality in water temperature is also issued. This has the disadvantage that when inspecting the cause of the abnormality, it is unclear which is the cause of the abnormality.

FIGS. 1 and 2 show the above-mentioned conventional device, and unless otherwise specified in the following description, the explanation will be based on positive logic in which a high level of voltage is defined as "1" and a low level of voltage is defined as "0".

In Figure 1, 1 is a rotation detection circuit that outputs an output when the internal combustion engine is rotating normally (for example, when it is rotating at a predetermined number of revolutions or more), and 2 is a rotation detection circuit that outputs an output when the internal combustion engine is rotating normally (for example, when it is rotating at a predetermined number of revolutions or more). 3 is a water temperature detection circuit that issues a signal when the water temperature is abnormal (for example, when the temperature exceeds a predetermined value); 4 is a rotation detection circuit 1; It is a timer circuit or a delay circuit that generates a signal after a predetermined time has elapsed since the signal is output, and 5 is an AND circuit that receives the output from the oil pressure detection circuit 2 and the output from the timer circuit 4, and 6 is an AND circuit. An OR circuit that receives the output of the AND circuit 5 and the output of the water temperature detection circuit 3, 7 is a circuit that uses the output of the OR circuit 6 to drive the stop mechanism of the internal combustion engine, and 8 is a circuit that uses the output of the OR circuit 6 to generate an alarm. 9 is a circuit and a display for indicating an abnormality in oil pressure using the output of the AND circuit 5, and 10 is a circuit and a display for indicating an abnormality in water temperature using the output of the water temperature detection circuit 3.

To explain the operation of the apparatus shown in FIG. 1, first turn on the main power switch (not shown). At this point, the internal combustion engine is not rotating, so the oil pressure detection circuit 2
The oil pressure signal is "1", which is the same as the abnormal state, but the signal of the rotation detection circuit 1 is "0", the output of the timer circuit 4 is "0", and the AND circuit 5 is in a closed state. .

Next, when you operate the starting circuit and start the internal combustion engine,
After a predetermined time elapses after the rotation detection circuit 1 outputs the signal, the timer circuit 4 outputs "1". The predetermined time is, for example, a time slightly longer than the time required for the output of the oil pressure detection circuit 2 to change from "1" to "0" at startup. When the output of timer circuit 4 becomes "1", if the internal combustion engine is operating normally,
Since the oil pressure becomes a pressure higher than a predetermined value and the output of the oil pressure detection circuit 2 becomes "0", even if the output of the timer circuit 4 becomes "1", the output of the AND circuit 5 becomes "0". It remains as it is.

Next, when the oil pressure detection circuit 2 or water temperature detection circuit 3 detects an abnormality during operation of the internal combustion engine and its output becomes "1", the output of the AND circuit 5 becomes "1" and the oil pressure abnormality display circuit 9 is activated. , or the water temperature abnormality display circuit 10 is activated, and the output of the OR circuit 6 becomes "1", driving the stop mechanism drive circuit 7 and the alarm generation circuit 8. Furthermore, if the water temperature rises to an abnormal state and the internal combustion engine stops, the oil pressure also drops and an oil pressure abnormality signal is displayed, making it impossible to determine whether the main cause is the water temperature or the oil pressure, even if an immediate inspection is performed. Moreover, when an inspection is performed after some time has elapsed, the water temperature may drop and the abnormal water temperature display may disappear, which may lead to erroneous determination of the cause.

Next, the abnormality display device shown in FIG. 2 will be explained. In the figure, numerals 1 to 10 indicate the same parts as in FIG. 11 is the main power switch, 12
13 is a reset signal output circuit that outputs a power reset signal to set a flip-flop 13 (to be described later) to a predetermined stable point when the main power switch 11 is turned on; This is a flip-flop circuit which is set to another stable point by the output of the timer circuit 4.

To explain the operation of the abnormality display device in FIG. 2, it is almost the same as the operation of the abnormality display device in FIG.
When the main power switch 11 is first turned on, a signal is output from the power reset signal generation circuit 12, and the flip-flop 13 is set to a predetermined stable point.
The terminal becomes "0". When the internal combustion engine is started by performing a starting operation in this state, the output of the timer circuit 4 becomes "1" after a predetermined time after the output of the rotation detection circuit 1 becomes "1", and the flip-flop 13 becomes "1". It is set at a stable point and the terminal is set to “1”.
The system has changed to display abnormalities in oil pressure and water temperature. In the case of the abnormality display device shown in FIG. 2, since the flip-flop 13 is used, even if the output of the timer circuit 4 is in the form of a pulse, the inhibiting operation of the AND circuit 5 can be ensured.

However, this abnormality display device also has the same drawbacks as the abnormality display device of FIG. In other words, when the water temperature rises and becomes abnormal, and the internal combustion engine stops, the water temperature abnormality is displayed as well as the oil pressure abnormality, and it is not possible to determine which is the main cause, and if inspection is performed after a period of time has passed, the water temperature is abnormal. The display may disappear, leading to a misunderstanding of the cause.

In addition, in the abnormality display device shown in FIGS. 1 and 2, when the oil pressure decreases, the oil pressure detection circuit 2 outputs an output to operate the oil pressure abnormality display circuit 9, and the stop mechanism drive circuit 7 operates to stop the internal combustion engine. stop. After the engine stops, the water temperature rises temporarily due to loss of cooling effect, etc., and the water temperature detection circuit 3 is activated, which activates the water temperature abnormality display circuit 10, which ultimately indicates that the main cause of the failure is oil pressure abnormality or water temperature abnormality. However, it has the disadvantage that it is not clear even when looking at the display.

This invention eliminates these drawbacks, maintains the abnormality display, and can display only the true cause of the abnormality.
The purpose is to enable correct recognition of the cause of abnormalities. This purpose is to provide an abnormality display device that detects abnormalities in the oil pressure and water temperature of an internal combustion engine and displays the abnormality, which includes means for detecting the oil pressure state, a first flip-flop that stores the oil pressure state, and a first flip-flop that stores the oil pressure state. means for displaying an oil pressure abnormality based on memory; means for detecting a water temperature state; a second flip-flop for storing the water temperature state; means for displaying a water temperature abnormality based on the memory of the second flip-flop; means for driving a mechanism for stopping the operation of the power equipment based on the memory of at least one of the first and second flip-flops; means for canceling the memory of the first and second flip-flops; and a prohibition gate provided on either the input side or the output side of the first and second flip-flops, each of the prohibition gates is supplied with the output of the other as a prohibition input, and the means for detecting the abnormality is provided. A mechanism is provided that sets one of the prohibition gates to a prohibition state according to the signal generated first among the abnormality detection signals from the controller, outputs only the signal generated first to the abnormality display means, and stops the operation of the power equipment. This is achieved by configuring the output to drive means and further by providing an inhibit input control switch for stopping the inhibiting operation of the inhibit gate.

Here, maintaining the abnormality display even after time has elapsed can be achieved relatively easily by configuring as shown in FIG.

In Fig. 3, 1 is a rotation detection circuit that outputs an output when the internal combustion engine is rotating normally, 2 is an oil pressure detection circuit that outputs a signal when the oil pressure is abnormal, and 4 is a rotation detection circuit that outputs a signal from rotation detection circuit 1. 3 is a water temperature detection circuit that outputs a signal when the water temperature is abnormal; 5 is a water temperature detection circuit that outputs a signal after a predetermined time has passed; 11 is the main power switch, 12 is a circuit that issues a power reset signal when the main power switch 11 is turned on, 13 is a flip-flop whose set input is the output of the timer circuit 4, and 14 is the output of the AND circuit 5. 15 is a flip-flop that receives the output of the water temperature detection circuit 3 as a set input, and the flip-flops 13, 14, 1
5 is reset by the output of the power supply reset circuit 12. 6 is an OR circuit that receives the outputs of flip-flops 14 and 15; 7 is a stop mechanism drive circuit that uses the output of OR circuit 6 to drive the stop mechanism of the internal combustion engine;
Reference numeral 8 is a circuit that generates an alarm based on the output of the OR circuit 6, 9 is an oil pressure abnormality display circuit that displays when the oil pressure is abnormal, and 10 is a water temperature abnormality display circuit that displays when the water temperature is abnormal.

The output of the timer circuit 4 is a flip-flop 13.
is connected to the set terminal S of the flip-flop 1.
The terminal 3 is connected to one input terminal of the AND circuit 5, and the output of the oil pressure detection circuit 2 is connected to the other input terminal of the AND circuit 5. The output of the AND circuit 5 is connected to the set terminal S of the flip-flop 14, so that the oil pressure state is stored in the flip-flop 14. The output of the water temperature detection circuit 3 is connected to the set terminal S of the flip-flop 15. flipflop 14
The terminal is connected to the oil pressure abnormality display circuit 9 and also to one input terminal of the OR circuit 6. Further, the terminal of the flip-flop 15 is connected to the water temperature abnormality display circuit 10 and also to another input terminal of the OR circuit 6, and the output terminal of the OR circuit 6 is connected to the stop mechanism drive circuit 7 and the alarm generation circuit 8. . The output terminals of power supply reset circuit 12 are connected to reset terminals R of flip-flops 13, 14, and 15, respectively.

The operation will be explained below.

In the device shown in FIG. 3, when the main power switch 11 is first turned on, the flip-flops 13, 14 and 15 are reset to a predetermined stable point by the output of the power reset circuit 12. At this point, the internal combustion engine is not rotating, so the output of the oil pressure detection circuit 2 is "1", but since the terminal of the flip-flop 13 is set to "0", the output of the AND circuit 5 is "1". 0". Therefore, the flip-flop 14 is not set, the output of the terminal is "0", the display of the oil pressure abnormality display circuit 9 is off, the output of the water temperature detection circuit 3 is also "0", and the flip-flop 15 is not set, so there is a water temperature abnormality. The display on the display circuit 10 is also off.

Next, when the internal combustion engine is started by operating the starting circuit (not shown), the output of the rotation detection circuit 1 becomes "1" and the output of the rotation detection circuit 1 becomes "1", and the predetermined time (first
After a length similar to that shown in the figure), the output becomes "1", the flip-flop 13 is set and reversed, the output of the terminal becomes "1", and abnormality monitoring of the hydraulic system is started.

When the oil pressure drops abnormally during operation of the internal combustion engine, the output of the oil pressure detection circuit 2 becomes "1" and the output of the AND circuit 5 becomes "1". Then, a set signal is input to the set terminal S of the flip-flop 14, the flip-flop 14 is inverted, the output of the terminal becomes "1", and the oil pressure abnormality display circuit 9 is activated to provide an indication. The output of the OR circuit 6 also becomes "1", which drives the stop mechanism drive circuit 7 to emergency stop the internal combustion engine, and also drives the alarm generation circuit 8 to issue an alarm.

In addition, when the water temperature rises abnormally, the output of the water temperature detection circuit 3 becomes "1", and the flip-flop 15
A set signal is input to the control circuit 1, which inverts and activates the water temperature abnormality display circuit 10 for display, and also drives the stop mechanism circuit 7 and the alarm generating circuit 8 in the same way as in the case of oil pressure abnormality. In this abnormality display device, the flip-flops 14 and 15 can store abnormal signals, and when the outputs of the oil pressure detection circuit 2 and the water temperature detection circuit 3 disappear, they become "0".
It has the advantage that the display can continue even if the display is turned on as long as the reset circuit 11 is not operated.

However, in the above configuration, as in the conventional example described above, when the oil pressure decreases and the engine is brought to an emergency stop, the water temperature temporarily increases and the water temperature abnormality display circuit 10
It is impossible to solve the problem that the oil pressure abnormality display circuit 9 also operates when the oil pressure is activated, or conversely, when the water temperature rises and the engine is brought to an emergency stop, the oil pressure decreases as the engine stops, and the oil pressure abnormality display circuit 9 is also activated.

In the present invention, the above problem has been solved by the configuration shown in FIGS. 4 and 5. A first embodiment of the present invention will be described below based on FIG. 4.

In the abnormality display device of the first embodiment of the present invention shown in FIG.
Among the abnormal signals generated earlier, only the abnormal signal generated earlier is stored and can be displayed, and numerals 1 to 15 indicate the same ones as in FIG. 16 is a prohibition gate that prohibits hydraulic abnormality display;
17 is a prohibition gate that prohibits abnormal water temperature display, 18
is an inhibit input control switch that controls input to inhibit gates 16 and 17.

The output terminal of the timer circuit 4 is connected to the set terminal S of the flip-flop 13, and the terminal of the flip-flop 13 is connected to one input terminal of the AND circuit 5. The output terminal of the oil pressure detection circuit 2 is connected to the other input terminal of the AND circuit 5, and the output terminal of the AND circuit 5 is connected to one input terminal of the inhibit gate 16. The flip-flop 14 stores the oil pressure state, and the set terminal S is connected to the output terminal of the inhibit gate 16. A terminal of the flip-flop 14 is connected to the oil pressure abnormality display circuit 9 and also to one input terminal of the OR circuit 6. Further, a terminal of the flip-flop 14 is connected to one input terminal of the inhibit gate 17 via one line of the inhibit input control switch 18 and an inverter 19. The output terminal of the water temperature detection circuit 3 is connected to the other input terminal of the inhibit gate 17, and the output of the inhibit gate 17 is connected to the set terminal S of the flip-flop 15. flip flop 15
is for storing the water temperature state, and the terminal is connected to the water temperature abnormality display circuit 10 and also to other input terminals of the OR circuit 6. In addition, the terminal of the flip-flop 15 is connected to the inhibit input control switch 18.
is connected to the other input terminal of the inhibit gate 16 via another line and an inverter 20. The output terminal of the OR circuit 6 is connected to a stop mechanism drive circuit 7 and an alarm generation circuit 8. The output of power supply reset circuit 12 is connected to each reset terminal R of flip-flops 13, 14, and 15.

Next, the operation of the apparatus shown in FIG. 4 will be explained. In this abnormality display device, when the main power switch 11 is turned on, the flip-flops 13 and 1 are turned on as shown in FIG.
4 and 15 are reset and set to a predetermined stable point, the Q terminal output becomes "1" and the terminal output becomes "0". At this point, flip-flop 1
One input of the inhibit gate 16 or 17 connected to the Q terminal of 4 or 15 is connected to the inverter 19
Or it is inverted by 20 and becomes "1". In this state, when the oil pressure detection circuit 2 detects an abnormality and outputs "1", it is ANDed with the terminal output "1" of the flip-flop 13 which is inverted by the output of the timer circuit 4, and the output of the AND circuit 5 becomes "1", the inhibit gate 16 becomes the output "1", the flip-flop 14 is set, the Q terminal output becomes "0", the terminal output becomes "1", and the hydraulic abnormality display circuit 9 and the stop mechanism drive circuit 7 are activated. The alarm generating circuit 8 is driven. Further, the terminal output "1" is inverted to "0" via the inhibit input control switch 18 and the inverter 19, and is supplied to one input terminal of the inhibit gate 17. Even if the output of the water temperature detection circuit 3 becomes "1" in this state, the output of the inhibition gate 17 remains "0" and the flip-flop 15 does not reverse, so the water temperature abnormality display circuit 10 does not display an abnormal oil pressure. Only the display circuit 9 is displayed.

Further, when the water temperature detection circuit 3 first detects an abnormality and outputs "1", the flip-flop 15 is set, the terminal output becomes "1", the water temperature abnormality display circuit 10 is displayed, and the terminal of the flip-flop 15 The output "1" is inverted to "0" via the inhibit input control switch 18 and the inverter 20 and becomes the inhibit input of the inhibit gate 16. In this state, even if the output of the oil pressure detection circuit 2 becomes "1", the output of the inhibition gate 16 is "0", the flip-flop 14 does not reverse, and the oil pressure abnormality display circuit 9
is not displayed, and only the water temperature abnormality display circuit 10 is displayed. By doing this, only the true cause of the abnormality is displayed. Furthermore, if the inhibit input control switch 18 is opened in advance, the inverters 19 and 2
0, one input of each of the prohibition gates 16 and 17 becomes "1", so that the apparatus of FIG. 4 can display all output alarms in the same manner as that of FIG. 3.

In another abnormality display device of the present invention shown in FIG. 5, numerals 1 to 15 indicate the same ones as in FIG. 3. Reference numeral 16 denotes an inhibit gate that takes the terminal output of the flip-flop 14 as one input signal input, 17 an inhibit gate that takes the terminal output of the flip-flop 15 as an input signal input, and 18' an inhibit input control switch that inputs the output of the inhibit gate 16. One line of inhibit input control switch 18' and inverter 1
9' to the other input terminal of the inhibit gate 17, and connect the output of the inhibit gate 17 to the other input terminal of the inhibit gate 16 via the other line of the inhibit input control switch 18' and the inverter 20'. are doing. Other connections are the same as in FIG. 4.

In the abnormality display device shown in FIG. 5, when the main power switch 11 is turned on, flip-flops 13, 14, and 15 are reset to predetermined stable points as in FIG. 3, and the terminal output of each flip-flop becomes "0". . and forbidden gates 16 and 17
Since one signal input is "0", the outputs of the inhibit gates 16 and 17 are "0", and the outputs of the inverters 19' and 20' are "1".

At this time, when the oil pressure drops abnormally and the output of the oil pressure detection circuit 2 becomes "1", the flip-flop 14 is set, reversed, and the terminal output becomes "1". Since the other input of the prohibition gate 16 is "1", the output of the prohibition gate 16 is "1". At the same time, the output of the inverter 19' becomes "0" and the inhibition gate 17 is closed. The output of the OR circuit 6 becomes "1" due to the output "1" of the prohibition gate 16, and the stop mechanism drive circuit 7 and alarm generation circuit 8 are driven to emergency stop the internal combustion engine and issue an alarm. Further, the output of the prohibition gate 16 is input to the oil pressure abnormality display circuit 9 to display the oil pressure abnormality.

Next, when the internal combustion engine stops or the water temperature rises abnormally due to other reasons, the output of the water temperature detection circuit 3 becomes "1", the flip-flop 15 is set and reversed, and the terminal output becomes "1". ”
However, since the prohibition gate 17 is in the closed state as described above, the output of the prohibition gate 17 remains "0" and the water temperature abnormality display circuit 10 is not driven.

Similarly, if the water temperature rises abnormally first, flip-flop 15 is set;
5 is inverted, the terminal output becomes "1", the output of the inhibit gate 17 becomes "1", and the output of the OR circuit 6 becomes "1". Then, the stop mechanism drive circuit 7 and the alarm generation circuit 8 are driven, and the water temperature abnormality display circuit 10 is activated. The output "1" of the inhibit gate 17 is inverted by the inverter 20' via the inhibit input control switch 18', thereby closing the inhibit gate 16. Next, even if the oil pressure becomes abnormal and the flip-flop 14 is reversed, the output of the inhibition gate 16 remains "0" and the oil pressure abnormality display circuit 9 is not activated.

By doing this, when the oil pressure or water temperature becomes abnormal, each signal is memorized, only the abnormality that occurred first is displayed, and the abnormality that occurs later is not displayed, and the main cause of the abnormality can be ascertained. be able to.

When the inhibit input control switch 18' is opened from the beginning, one input of each of the inhibit gates 16 and 17 becomes "1" by the inverters 19' and 20', so that full display can be performed as in FIG. 3. . Further, when the inhibit input control switch 18' is turned off during abnormality display, the inhibition gates 16 and 17 are opened, and all abnormalities can be displayed according to the states of the flip-flops 14 and 15 that store the abnormality.

The above explanation is about abnormalities in oil pressure and water temperature, but the invention is not limited to this. Any number of abnormalities can be displayed, and if there are three or more abnormalities, flip-flop or prohibition can be performed depending on the number of abnormalities displayed. Just add a gate. Also, rather than positive logic,
It can also be controlled by negative logic, and the present invention also includes the use of other flip-flops such as a JK flip-flop in place of the SR flip-flop. Furthermore, it is applicable not only to abnormality indications of internal combustion engines but also to general multiple status indications, and can be used in combination with other sequence circuits and automatic control circuits. Furthermore, it has the advantage that it can be used even if it is inserted into a conventional abnormality display device.

In the above embodiment, the rotation speed of the internal combustion engine itself, the oil pressure of the lubricating oil, and the temperature of the cooling water are detected,
Although we have described an example in which the internal combustion engine is stopped in the event of an abnormality, in power equipment in which the compressor is driven by a motor or internal combustion engine, the rotation speed of the compressor itself, the temperature of the cooling water, and the oil pressure of the lubricating oil are detected. The present invention can also be applied to embodiments in which an internal combustion engine or motor is brought to an emergency stop when an abnormality occurs in these components.

As explained in detail above, the present invention provides a compressor that is driven by an internal combustion engine or a motor, or a compressor that is to be driven by an internal combustion engine, which supplies power (energy) to the outside and also has a lubricating device itself. In a moving device having a built-in cooling device, a means for detecting a hydraulic pressure state, a flip-flop of stage 1 for storing the hydraulic pressure state, and the first flip-flop described above.
a means for displaying a hydraulic abnormality based on the memory of the flip-flop; a means for detecting a water temperature state; a second flip-flop for storing the water temperature state; and a means for displaying a water temperature abnormality based on the memory of the second flip-flop. and means for driving a mechanism for stopping the operation of the power equipment based on the memory of at least one of the first and second flip-flops; and means for canceling the memory of the first and second flip-flops. and a prohibition gate provided on either the input side or the output side of the first and second flip-flops, and both of the prohibition gates are supplied with the output of the other as a prohibition input to prevent the abnormality from occurring. One of the prohibition gates is set to a prohibited state by the signal generated first among the abnormality detection signals from the detecting means, and only the signal generated first is outputted to the abnormality display means, and the operation of the power equipment is stopped. The system detects the oil pressure and water temperature states when the power equipment is in operation, stores the detected oil pressure state and water temperature state, and outputs the output to the means for driving the mechanism. If there is an abnormality, the system displays the abnormality in oil pressure or water temperature based on the memory, and also stops the operation of the power equipment, so that when an abnormality occurs in either water temperature or oil pressure, the equipment can be started quickly. It is possible to prevent serious failures of power equipment by stopping the equipment, following the display to identify the abnormal part that caused the shutdown, and making early repairs possible. By making it possible to display only the memory that occurred first among the memories stored in the storage means, it is possible to stop the operation of the power equipment due to an abnormality in either the oil pressure or the water temperature, and to prevent the power equipment from stopping after that. Even if the other detection signal indicates an abnormality, this is not displayed, so there is no risk of misidentifying an abnormality in the motion drive situation of the power equipment.

Furthermore, due to the existence of the memory means, even if the oil pressure and water temperature signals disappear due to the stoppage of the power equipment, the memory will continue to display the location of the abnormality, allowing you to accurately confirm the location of the abnormality. After repair, by clearing the memory, the display circuit returns to its original state before the power equipment started operating.

Furthermore, in the present invention, by controlling the prohibition operation of the prohibition gate with the prohibition input control switch, it is possible to select whether to display only the previously occurring abnormality or all abnormalities. Display becomes possible.

[Brief explanation of the drawing]

1 and 2 are schematic diagrams of a conventional abnormality display device, and FIG. 3 is a schematic diagram of an abnormality display device according to an improvement of the conventional example. 4 and 5 are schematic diagrams of abnormality display devices according to first and second embodiments of the present invention. In the figure, 1 is an internal combustion engine rotation detection circuit, 2 is an oil pressure detection circuit, 3 is a water temperature detection circuit, 4 is a timer circuit, 7 is a stop mechanism drive circuit, 8 is an alarm generation circuit,
9 is an oil pressure abnormality display circuit; 10 is a water temperature abnormality display circuit; 13, 14, and 15 are flip-flops;
6 and 17 are inhibit gates, and 18 and 18' are inhibit input control switches, respectively.

Claims (1)

[Scope of Claims] 1. An abnormality display device that detects and displays abnormalities in oil pressure and water temperature of power equipment such as internal combustion engines and compressors, which includes means for detecting the oil pressure state and a first flip-flop that stores the oil pressure state. and means for displaying an oil pressure abnormality based on the memory of the first flip-flop; and means for detecting a water temperature state.
a second flip-flop that stores water temperature status;
means for displaying an abnormal water temperature based on the memory of the second flip-flop; and means for driving a mechanism for stopping the operation of the power equipment based on the memory of at least one of the first and second flip-flops; , a means for canceling the memory of the first and second flip-flops, and an inhibit gate provided on either the input side or the output side of the first and second flip-flops, The outputs of the other gates are supplied as inhibit inputs, and one of the inhibit gates is set to the inhibit state by the first generated abnormality detection signal from the abnormality detecting means, and only the first generated signal is inhibited. What is claimed is: 1. An abnormality display device for power equipment, characterized in that the abnormality display is output to an abnormality display means and also to means for driving a mechanism for stopping the operation of the power equipment. 2. An abnormality display device that detects abnormalities in oil pressure and water temperature of power equipment such as internal combustion engines and compressors and displays the abnormality, comprising means for detecting the oil pressure state, a first flip-flop for storing the oil pressure state, and the first flip-flop described above. means for displaying an oil pressure abnormality based on the memory of the flip-flop; means for detecting a water temperature state;
a second flip-flop that stores water temperature status;
means for displaying an abnormal water temperature based on the memory of the second flip-flop; and means for driving a mechanism for stopping the operation of the power equipment based on the memory of at least one of the first and second flip-flops; , a means for canceling the memory of the first and second flip-flops, a prohibition gate provided on either the input side or the output side of the first and second flip-flops, and a prohibition operation of the prohibition gate. and an inhibit input control switch for stopping the inhibit input control switch, and the output of the other inhibit gate is supplied as the inhibit input via the inhibit input control switch, and when the inhibit input control switch is closed, the above abnormality is detected. One of the prohibition gates is set to a prohibited state by the signal generated first among the abnormality detection signals from the means for detecting the abnormality, and only the signal generated first is outputted to the abnormality display means, and the driving of the power equipment is controlled. An abnormality display device for a power equipment, characterized in that the output is output to a means for driving a mechanism to be stopped, and when the inhibit input control switch is open, both the inhibit gates are in a short-circuited state.