CN110264688B - Alarm and alarm fault detection method - Google Patents
Alarm and alarm fault detection method Download PDFInfo
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- CN110264688B CN110264688B CN201910540901.2A CN201910540901A CN110264688B CN 110264688 B CN110264688 B CN 110264688B CN 201910540901 A CN201910540901 A CN 201910540901A CN 110264688 B CN110264688 B CN 110264688B
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
- G08B21/16—Combustible gas alarms
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/12—Checking intermittently signalling or alarm systems
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Abstract
The embodiment of the application provides an alarm and an alarm fault detection method, the alarm comprises a sensor, a central processing module and a pulse signal output module, the central processing module is connected with the sensor through the pulse signal output module, the central processing module is further connected with the sensor, and the method comprises the following steps: the pulse signal output module outputs a pulse periodic signal to the sensor under the control of the central processing module; the central processing module acquires a level signal of a first connecting point of the sensor and the pulse signal output module in a preset time period; the central processing module determines the fault state of the sensor according to the level signal of the pulse periodic signal in the preset time period and the level signal of the first connecting point, and can acquire the level signal of the first connecting point in the preset time period and process the level signal and timely find the fault state of the sensor, so that whether the alarm breaks down or not can be timely found, and the normal work of the alarm is ensured.
Description
Technical Field
The application relates to the technical field of alarms, in particular to an alarm and an alarm fault detection method.
Background
Can produce the poisonous scene to the human body of carbon monoxide etc. in some uses, probably because of indoor ventilation is bad or the design of coal stove device is improper, can cause carbon monoxide concentration in the air to increase, because carbon monoxide is colorless tasteless gas, consequently can arouse indoor human carbon monoxide poisoning, in order to prevent carbon monoxide poisoning, at present at indoor installation alarm usually, when indoor carbon monoxide concentration is too high, the alarm gives an alarm to the police and suggests, so that can take measures such as ventilation and make the carbon monoxide concentration in the indoor air reduce, but the alarm breaks down unable normal work easily, and can only discover the trouble of alarm through periodical maintenance, thereby can't in time discover whether the alarm breaks down, lead to human carbon monoxide poisoning easily.
Disclosure of Invention
An object of the embodiment of the application is to provide an alarm and an alarm fault detection method, so as to solve the problem that whether the alarm fails or not cannot be found in time in the prior art.
In a first aspect, an embodiment of the present application provides an alarm, where the alarm includes a sensor, a central processing module and a pulse signal output module, the central processing module is connected to the sensor through the pulse signal output module, and the central processing module is further connected to the sensor; the pulse signal output module is used for outputting a pulse periodic signal to the sensor under the control of the central processing module; the central processing module is used for acquiring a level signal of a first connecting point of the sensor and the pulse signal output module within a preset time period; the central processing module is further used for determining the fault state of the sensor according to the level signal of the pulse periodic signal in the preset time period and the level signal of the first connecting point.
In the implementation process, the pulse signal output module of the alarm can provide pulse periodic signals for the sensor in the alarm, so that the sensor performs gas detection and outputs detection data, then the central processing module can acquire level signals of the first connecting points of the sensor and the pulse signal output module within a preset time period, then the level signals of the first connecting points can be compared with the pulse periodic signals for processing, and the like, the fault state of the sensor can be found in time, and the safety of the indoor environment is further guaranteed.
Optionally, the central processing module is further configured to determine a fault state of the sensor according to the level signal of the pulse periodic signal in the preset time period and the level signal of the first connection point, including: the central processing module is further configured to determine whether the level signal of the first connection point is at a low level within the preset time period according to the level signal of the pulse periodic signal within the preset time period; the central processing module is further configured to determine a fault state in which a short circuit occurs between the first connection point and a ground terminal of the sensor when the level signal of the first connection point is at a low level within the preset time period.
In the implementation process, the level signal of the first connection point is a continuous low level under the condition that the alarm is in a short-circuit fault state during operation, so that the short-circuit fault of the alarm can be determined by judging that the level signal of the first connection point is the low level within a preset time period, and the fault of the alarm can be found in time.
Optionally, the central processing module is further configured to determine a fault state of the sensor according to the level signal of the pulse periodic signal in the preset time period and the level signal of the first connection point, including: the central processing module is further configured to determine whether the level signal of the first connection point is at a high level within the preset time period according to the level signal of the pulse periodic signal within the preset time period; the central processing module is further configured to determine a fault state in which a short circuit occurs between the first connection point and the signal output port of the sensor when the level signal of the first connection point is at a high level within the preset time period.
In the implementation process, because the level signal of the first connection point is a continuous high level when the alarm is in operation and a short-circuit fault state occurs between the first connection point and the signal output port of the sensor, the level signal of the first connection point is judged to be a high level within a preset time period, and then the short-circuit fault between the first connection point of the alarm and the signal output port of the sensor can be determined, so that the fault of the alarm can be found in time.
Optionally, the alarm further includes a power supply detection module, the power supply detection module is connected to the central processing module through a second connection point, the power supply detection module is connected to the central processing module through the first connection point, the central processing module is configured to detect a level signal of the second connection point, wherein the level signal of the first connection point is consistent with the level signal of the second connection point.
In the implementation process, the power supply detection module can be connected with the central processing unit through the second connecting point, so that the central processing unit can detect the level signal of the second connecting point, and the fault of the alarm can be found in time.
Optionally, the alarm further includes an output module, the output module is connected to the sensor through a third connection point, and an output end of the output module is connected to the central processing module; the central processing module is also used for detecting a level signal of the output end; the central processing module is further configured to determine a fault state of the sensor according to the level signal of the pulse periodic signal in the preset time period and the level signal of the third connection point.
Optionally, the central processing module is further configured to determine a fault state of the sensor according to the level signal of the pulse periodic signal in the preset time period and the level signal of the third connection point, including: the central processing module is further configured to determine whether a level signal of the third connection point is consistent with the pulse periodic signal according to a level signal of the pulse periodic signal within the preset time period, where a period of the level signal of the third connection point is consistent with a period of the pulse periodic signal, and an amplitude of the level signal of the third connection point is smaller than an amplitude of the pulse periodic signal; the central processing module is further configured to determine that a fault state occurs between any two ports of the three ports of the sensor when the level signal of the third connection point is inconsistent with the pulse period signal within the preset time period.
In the implementation process, when the alarm is in operation and an open-circuit fault state occurs between any two of the three ports of the sensor, the level signal of the third connection point is consistent with the pulse periodic signal, so that whether the level signal of the third connection point is consistent with the pulse periodic signal or not is judged, the open-circuit fault state occurring between any two of the three ports of the sensor of the alarm can be determined, and the fault of the alarm can be found in time.
Optionally, the central processing module is further configured to determine a fault state of the sensor according to the level signal of the pulse periodic signal in the preset time period and the level signal of the third connection point, including: the central processing module is further configured to determine whether the level signal of the third connection point is a high level according to the level signal of the pulse periodic signal in the preset time period; the central processing module is further configured to determine that a fault state of disconnection occurs between any two of the three ports of the sensor when the level signal of the third connection point is a high level.
In the implementation process, since the alarm is in operation and when an open-circuit fault state occurs between any two of the three ports of the sensor, the level signal of the third connection point should be at a high level, it is determined whether the level signal of the third connection point is at a high level, and the open-circuit fault state occurs between any two of the three ports of the sensor of the alarm, so that a fault of the alarm can be found in time.
Optionally, the central processing module is further configured to determine a fault state of the sensor according to the level signal of the pulse periodic signal in the preset time period and the level signal of the third connection point, including: the central processing module is further configured to determine whether the level signal of the third connection point is a low level according to the level signal of the pulse periodic signal in the preset time period; the central processing module is further configured to determine a fault state of a short circuit between the third connection point and the second connection point when the level signal of the third connection point is a continuous low level.
In the implementation process, when the alarm is in operation and a short-circuit fault state occurs between the third connection point and the second connection point, the level signal of the third connection point should be at a low level, so that whether the level signal of the third connection point is at the low level is judged, the short-circuit fault state occurs between any two ports of the three ports of the sensor of the alarm can be determined, and the fault of the alarm can be found in time.
Optionally, the pulse signal output module includes a first resistor, a second resistor, a third resistor, a first capacitor, and a field effect transistor; the central processing module with the one end of first resistance is connected, the other end of first resistance with the grid of field effect transistor is connected, the one end of second resistance with the grid of field effect transistor is connected, the other end of second resistance is connected with the power, the one end of third resistance with the power is connected, the other end of third resistance with the one end of first electric capacity is connected, the other end ground connection of first electric capacity, the source electrode of field effect transistor with the other end of third resistance is connected, the drain electrode of field effect transistor pass through first connecting point with the sensor is connected.
In a second aspect, an embodiment of the present application provides an alarm fault detection method, which is applied to an alarm, where the alarm includes a sensor, a central processing module and a pulse signal output module, the central processing module passes through the pulse signal output module and the sensor, the central processing module is further connected to the sensor, and the method includes: the pulse signal output module outputs a pulse periodic signal to the sensor under the control of the central processing module; the central processing module acquires a level signal of a first connecting point of the sensor and the pulse signal output module within a preset time period; and the central processing module determines the fault state of the sensor according to the level signal of the pulse periodic signal in the preset time period and the level signal of the first connecting point.
Additional features and advantages of the present application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the present application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of an alarm provided in an embodiment of the present application;
fig. 2 is a circuit diagram of an alarm provided in an embodiment of the present application;
FIG. 3 is a schematic structural diagram of another alarm provided by the embodiment of the application;
fig. 4 is a schematic diagram of level signals of a first connection point according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of a level signal of another first connection point according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a level signal of a third connection point a according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram of a level signal of another third connection point a according to an embodiment of the present application;
fig. 8 is a flowchart of an alarm fault detection method according to an embodiment of the present application.
Icon: 10-an alarm; 100-a sensor; 200-a central processing module; 300-a pulse signal output module; 400-a power supply detection module; 500-output module.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an alarm 10 according to an embodiment of the present application, where the alarm 10 includes a sensor 100, a central processing module 200 and a pulse signal output module 300, the central processing module 200 is connected to the sensor 100 through the pulse signal output module 300, and the central processing module 200 is further connected to the sensor 100; the pulse signal output module 300 is configured to output a pulse period signal to the sensor 100 under the control of the central processing module 200; the central processing module 200 is configured to acquire a level signal of a first connection point of the sensor 100 and the pulse signal output module 300 within a preset time period; the central processing module 200 is further configured to determine a fault state of the sensor 100 according to the level signal of the pulse periodic signal in the preset time period and the level signal of the first connection point.
Wherein the sensor 100 may be an air sensor, such as a carbon monoxide sensor manufactured by FIS of Japan.
As an embodiment, the pulse signal output module 300 outputs a pulse period signal to the sensor 100 under the control of the central processing module 200, and the sensor 100 can be in an operating state, wherein when the pulse period signal is a narrow pulse, the sensor 100 is in an air detection operating state and can detect a toxic gas in the air, such as carbon monoxide gas, and when the pulse period signal is a wide pulse, the sensor 100 is in an air cleaning operating state and can clean the adsorption effect of the sensor 100 due to other substances and prolong the service life of the sensor 100, and furthermore, the period time of the wide pulse signal is 8ms, and the wide pulse signal is a periodic pulse signal with a high level time of 300us in this period; the cycle time of the narrow pulse signal is 8ms, and the narrow pulse signal is a periodic pulse signal with a high level time of 20us in the cycle.
In the implementation process, the pulse signal output module 300 of the alarm 10 may provide a pulse periodic signal for the sensor 100 in the alarm 10, so that the sensor 100 performs gas detection and outputs detection data, then the central processing module 200 may acquire a level signal of a first connection point of the sensor 100 and the pulse signal output module 300 within a preset time period, and then may compare the level signal of the first connection point with the pulse periodic signal, and perform other processing, so as to find out a fault state of the sensor 100 in time, and further ensure the safety of an indoor environment.
Referring to fig. 2, fig. 2 is a circuit diagram of an alarm 10 according to an embodiment of the present disclosure, in which the pulse signal output module 300 includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, and a field effect transistor Q1; the central processing module 200 is connected with one end of a first resistor R1 through a Control-S end, the other end of the first resistor R1 is connected with a gate of a field effect transistor Q1, one end of a second resistor R2 is connected with a gate of a field effect transistor Q1, the other end of the second resistor R2 is connected with a power supply, one end of a third resistor R3 is connected with the power supply, the other end of the third resistor R3 is connected with one end of a first capacitor C1, the other end of the first capacitor C1 is grounded, a source of the field effect transistor Q1 is connected with the other end of the third resistor R3, and a drain of the field effect transistor Q1 is connected with the sensor 100 through a first connection point a.
The central processing module 200 is further configured to determine a fault state of the sensor 100 according to the level signal of the pulse periodic signal in the preset time period and the level signal of the first connection point a, including: the central processing module 200 is further configured to determine whether the level signal of the first connection point a is at a low level in the preset time period according to the level signal of the pulse periodic signal in the preset time period; the central processing module 200 is further configured to determine that a short circuit fault state occurs between the first connection point a and the ground terminal of the sensor 100 when the level signal of the first connection point a is at a low level within the preset time period.
The operating principle of the central processing module 200 determining whether the fault state of the short circuit occurs between the first connection point a and the ground terminal of the sensor 100 by determining whether the level signal of the first connection point a is at a low level within a preset time period is as follows, when the short circuit occurs between the first connection point a and the ground terminal of the sensor 100, it is indicated that the first connection point a is directly connected to the ground terminal, and therefore the first connection point a is at a low level within the preset time period, please refer to fig. 4, where fig. 4 is a schematic diagram of the level signal of the first connection point a according to an embodiment of the present application, in the diagram, a waveform is the level signal when the short circuit does not occur between the first connection point a and the ground terminal of the sensor 100, and b waveform is the level signal when the short circuit occurs between the first connection point a and the ground terminal of the sensor 100.
In the implementation process, since the level signal of the first connection point a should be a continuous low level when the alarm 10 is in a short-circuit fault state during operation, if the level signal of the first connection point a is determined to be a low level within a preset time period, the short-circuit fault of the alarm 10 can be determined, and thus the fault of the alarm 10 can be found in time.
Optionally, the central processing module 200 is further configured to determine a fault state of the sensor 100 according to the level signal of the pulse periodic signal in the preset time period and the level signal of the first connection point a, including: the central processing module 200 is further configured to determine whether the level signal of the first connection point a is at a high level in the preset time period according to the level signal of the pulse periodic signal in the preset time period; the central processing module 200 is further configured to determine that a short circuit fault state occurs between the first connection point a and the signal output port of the sensor 100 when the level signal of the first connection point a is at a high level in the preset time period.
The central processing module 200 determines whether the level signal of the first connection point a is at a high level within a predetermined time period, the operation principle of the fault state, which determines whether or not a short circuit occurs between the first connection point a and the signal output port of the sensor 100, is as follows, when a short circuit occurs between the first connection point a and the signal output port of the sensor 100, it means that the first connection point a is directly connected to the power source, and therefore the first connection point a is at a high level for a predetermined period of time, see fig. 5, figure 5 is a schematic diagram of the level signal of the first connection point a according to another embodiment of the present application, in the figure, a waveform is a level signal when a short circuit does not occur between the first connection point a and the signal output port of the sensor 100, and b waveform is a level signal when a short circuit occurs between the first connection point a and the signal output port of the sensor 100.
In the implementation process, when the alarm 10 is in operation and a short-circuit fault state occurs between the first connection point a and the signal output port of the sensor 100, the level signal of the first connection point a should be a continuous high level, so that it can be determined that a short-circuit fault occurs between the first connection point a of the alarm 10 and the signal output port of the sensor 100 by determining that the level signal of the first connection point a is a high level within a preset time period, and the fault of the alarm 10 can be found in time.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another alarm 10 provided in the embodiment of the present application, where the alarm 10 further includes a power supply detection module 400 and an output module 500.
The power supply detection module 400 includes a fourth resistor R4 and a second capacitor C2; the central processing module 200 is connected to one end of the fourth resistor R4 through the ADIN-S terminal, the other end of the fourth resistor R4 is connected to the first port of the sensor 100, one end of the second capacitor C2 is connected to one end of the fourth resistor R4, and the other end of the second capacitor C2 is grounded.
Referring to fig. 2, the power supply detecting module 400 is connected to the central processing module 200 through a second connection point B, the power supply detecting module 400 is connected to the central processing module 200 through the first connection point a, and the central processing module 200 is configured to detect a level signal of the second connection point B, where the level signal of the first connection point a is consistent with the level signal of the second connection point B.
In fig. 2, it can be seen that the level signals of the first connection point a and the second connection point B are consistent, and the level amplitude of the second connection point B is smaller than the level amplitude of the first connection point a, so that the power supply detection module 400 can also be connected with the central processing unit through the second connection point B, so that the central processing unit can detect the level signal of the second connection point B, and then find the fault of the alarm 10 in time.
For example, when the level signal of the second connection point B is a low level for a preset time period, a fault state in which a short circuit occurs between the second connection point B and the ground terminal of the sensor 100 may be determined; when the level signal of the second connection point B is at a high level for a preset time period, it may be determined that a fault state of a short circuit occurs between the second connection point B and the signal output port of the sensor 100.
Optionally, the alarm 10 further includes an output module 500, the output module 500 is connected to the sensor 100 through a third connection point C, and an output end of the output module 500 is connected to the central processing module 200; the central processing module 200 is further configured to detect a level signal at the output end; the central processing module 200 is further configured to determine a fault state of the sensor 100 according to the level signal of the pulse periodic signal in the preset time period and the level signal of the third connection point C.
The output module 500 includes a fifth resistor R5, a sixth resistor R6, and a third capacitor C3; one end of the fifth resistor R5 is connected to the power supply, the other end of the fifth resistor R5 is connected to the third port of the Sensor 100, one end of the sixth resistor R6 is connected to the third port of the Sensor 100, the other end of the sixth resistor R6 is connected to the central processing module 200 through a Sensor terminal, the other end of the sixth resistor R6 is further connected to one end of the third capacitor C3, and the other end of the third capacitor C3 is grounded.
According to the above circuit description, the central processing module 200 is further configured to determine a fault state of the sensor 100 according to the level signal of the pulse periodic signal in the preset time period and the level signal of the third connection point C, including: the central processing module 200 is further configured to determine whether the level signal of the third connection point C is consistent with the pulse periodic signal according to the level signal of the pulse periodic signal in the preset time period, where a period of the level signal of the third connection point C is consistent with a period of the pulse periodic signal, and an amplitude of the level signal of the third connection point C is smaller than an amplitude of the pulse periodic signal; the central processing module 200 is further configured to determine that a fault state occurs between any two ports of the three ports of the sensor 100 when the level signal of the third connection point C is inconsistent with the pulse period signal within the preset time period.
The central processing module 200 determines whether the level signal of the third node C is consistent with the pulse period signal within a predetermined time period, the principle of operation to determine a fault condition between any two of the three ports of the sensor 100 is thus as follows, wherein, the coincidence of the level signal of the third connecting point C and the pulse period signal means that the period of the level signal of the third connecting point C coincides with the period of the pulse period signal, and the amplitude of the level signal of the third connection point C is smaller than the amplitude of the pulse period signal, when a fault condition occurs between any two of the three ports of the sensor 100, it means that the voltage variation signal generated by the sensor 100 detecting the variation of the concentration of carbon monoxide in the air, which is identical in period and different in amplitude from the pulse period signal, cannot be detected at the third connection point C.
In the implementation process, when the alarm 10 is in operation and an open-circuit fault state occurs between any two of the three ports of the sensor 100, the level signal of the third connection point C should be consistent with the pulse periodic signal, so that whether the level signal of the third connection point C is consistent with the pulse periodic signal or not is determined, and the open-circuit fault state occurs between any two of the three ports of the sensor 100 of the alarm 10, so that a fault of the alarm 10 is found in time.
Optionally, the central processing module 200 is further configured to determine a fault state of the sensor 100 according to the level signal of the pulse periodic signal in the preset time period and the level signal of the third connection point C, including: the central processing module 200 is further configured to determine whether the level signal of the third connection point C is at a high level according to the level signal of the pulse periodic signal in the preset time period; the central processing module 200 is further configured to determine a fault state of disconnection between any two of the three ports of the sensor 100 when the level signal of the third connection point C is high level.
The working principle of the central processing module 200 for determining whether the fault state of the disconnection occurs between any two of the three ports of the sensor 100 by determining whether the level signal of the third connection point C is at a high level within a preset time period is as follows, when the disconnection occurs between any two of the three ports of the sensor 100, it is indicated that the third connection point C is directly connected to the power supply, and therefore the third connection point C is at a high level within the preset time period, please refer to fig. 6, where fig. 6 is a schematic diagram of a level signal of the third connection point a provided in this embodiment of the present application, where a waveform is a level signal when the disconnection does not occur between any two of the three ports of the sensor 100, and b waveform is a level signal when the disconnection occurs between any two of the three ports of the sensor 100.
Therefore, since the alarm 10 is in operation and the level signal of the third connection point C should be at a high level when an open-circuit fault condition occurs between any two of the three ports of the sensor 100, it is determined whether the level signal of the third connection point C is at a high level, and the open-circuit fault condition occurs between any two of the three ports of the sensor 100 of the alarm 10 can be determined, so that a fault of the alarm 10 can be found in time.
Optionally, the central processing module 200 is further configured to determine a fault state of the sensor 100 according to the level signal of the pulse periodic signal in the preset time period and the level signal of the third connection point C, including: the central processing module 200 is further configured to determine whether the level signal of the third connection point C is at a low level according to the level signal of the pulse periodic signal in the preset time period; the central processing module 200 is further configured to determine a fault state of a short circuit between the third connection point C and the second connection point B when the level signal of the third connection point C is a continuous low level.
The working principle of the central processing module 200 determining whether the fault state of the short circuit occurs between the third connection point C and the second connection point B by determining whether the level signal of the third connection point C is at a low level within a preset time period is as follows, when a short circuit occurs between the third connection point C and the second connection point B, it indicates that the third connection point C is connected to the ground terminal, and therefore the third connection point C is at a low level within the preset time period, please refer to fig. 7, which is a schematic diagram of another level signal of the third connection point a provided in this embodiment of the present application, where a waveform is a level signal when the short circuit does not occur between the third connection point C and the second connection point B, and B waveform is a level signal when the short circuit occurs between the third connection point C and the second connection point B.
Therefore, when the alarm 10 is in operation and a short-circuit fault state occurs between the third connection point C and the second connection point B, the level signal of the third connection point C should be at a low level, and therefore, whether the level signal of the third connection point C is at a low level is determined, and the short-circuit fault state occurs between any two ports of the three ports of the sensor 100 of the alarm 10 can be determined, so that a fault of the alarm 10 can be found in time.
Based on the same inventive concept, an alarm 10 fault detection method is further provided in the embodiment of the present application, and is applied to an alarm 10, where the alarm 10 includes a sensor 100, a central processing module 200, and a pulse signal output module 300, the central processing module 200 is connected to the sensor 100 through the pulse signal output module 300, the central processing module 200 is further connected to the sensor 100, please refer to fig. 8, and fig. 8 is a flowchart of the alarm 10 fault detection method provided in the embodiment of the present application, and includes the following steps:
step S110: the pulse signal output module 300 outputs a pulse period signal to the sensor 100 under the control of the central processing module 200.
Step S120: the central processing module 200 acquires a level signal of the first connection point a of the sensor 100 and the pulse signal output module 300 within a preset time period.
Step S130: the central processing module 200 determines the fault state of the sensor 100 according to the level signal of the pulse periodic signal in the preset time period and the level signal of the first connection point a.
To sum up, the embodiment of the present application provides an alarm 10 and an alarm fault detection method, pulse signal output module 300 of alarm 10 can provide pulse periodic signal for sensor 100 in alarm 10, so that sensor 100 performs gas detection work and outputs detection data, then central processing module 200 can acquire level signal of first connection point a of sensor 100 and pulse signal output module 300 in a preset time period, and then can compare level signal of first connection point a with pulse periodic signal and wait to process, can in time discover the fault state that sensor 100 takes place, and then guarantee the safety of indoor environment.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Claims (7)
1. The alarm is characterized by comprising a sensor, a central processing module, a pulse signal output module, a power supply detection module and an output module, wherein the central processing module is connected with the sensor through the pulse signal output module and is also connected with the sensor;
the pulse signal output module is used for outputting a pulse periodic signal to the sensor under the control of the central processing module;
the central processing module is used for acquiring a level signal of a first connecting point of the sensor and the pulse signal output module within a preset time period;
the central processing module is further used for determining the fault state of the sensor according to the level signal of the pulse periodic signal in the preset time period and the level signal of the first connecting point;
the power supply detection module is connected with the central processing module through a second connecting point;
the central processing module is further configured to detect a level signal of the second connection point, where the level signal of the first connection point is consistent with the level signal of the second connection point;
the pulse signal output module comprises a first resistor, a second resistor, a third resistor, a first capacitor and a field effect transistor;
the central processing module is connected with one end of the first resistor, the other end of the first resistor is connected with the grid electrode of the field effect transistor, one end of the second resistor is connected with the grid electrode of the field effect transistor, the other end of the second resistor is connected with a power supply, one end of the third resistor is connected with the power supply, the other end of the third resistor is connected with one end of the first capacitor, the other end of the first capacitor is grounded, the source electrode of the field effect transistor is connected with the other end of the third resistor, and the drain electrode of the field effect transistor is connected with the sensor through the first connecting point;
the power supply detection module comprises a fourth resistor and a second capacitor; the central processing module is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with the first port of the sensor through the first connecting point, one end of the fourth resistor is connected with one end of the second capacitor through the second connecting point, and the other end of the second capacitor is grounded;
wherein the second port of the sensor is grounded;
the output module comprises a fifth resistor, one end of the fifth resistor is connected with the power supply, and the other end of the fifth resistor is connected with a third port of the sensor.
2. The alarm apparatus according to claim 1, wherein the central processing module is further configured to determine a fault state of the sensor according to the level signal of the pulse periodic signal in the preset time period and the level signal of the first connection point, and comprises:
the central processing module is further configured to determine whether the level signal of the first connection point is at a low level within the preset time period according to the level signal of the pulse periodic signal within the preset time period;
the central processing module is further configured to determine a fault state in which a short circuit occurs between the first connection point and a ground terminal of the sensor when the level signal of the first connection point is at a low level within the preset time period.
3. The alarm apparatus according to claim 1, wherein the central processing module is further configured to determine a fault state of the sensor according to the level signal of the pulse periodic signal in the preset time period and the level signal of the first connection point, and comprises:
the central processing module is further configured to determine whether the level signal of the first connection point is at a high level within the preset time period according to the level signal of the pulse periodic signal within the preset time period;
the central processing module is further configured to determine a fault state of a short circuit occurring between the first connection point and the signal output terminal of the sensor when the level signal of the first connection point is a high level within the preset time period.
4. The alarm of claim 1, wherein the output of the output module is connected to the central processing module;
the central processing module is also used for detecting a level signal of the output end;
the output module is connected with the sensor through a third connecting point;
the central processing module is further configured to determine a fault state of the sensor according to the level signal of the pulse periodic signal in the preset time period and the level signal of the third connection point.
5. The alarm apparatus according to claim 4, wherein the central processing module is further configured to determine a fault state of the sensor according to the level signal of the pulse periodic signal in the preset time period and the level signal of the third connection point, and comprises:
the central processing module is further configured to determine whether a level signal of the third connection point is consistent with the pulse periodic signal according to a level signal of the pulse periodic signal within the preset time period, where a period of the level signal of the third connection point is consistent with a period of the pulse periodic signal, and an amplitude of the level signal of the third connection point is smaller than an amplitude of the pulse periodic signal;
the central processing module is further configured to determine that a fault state occurs between any two ports of the three ports of the sensor when the level signal of the third connection point is inconsistent with the pulse period signal within the preset time period.
6. The alarm apparatus according to claim 4, wherein the central processing module is further configured to determine a fault state of the sensor according to the level signal of the pulse periodic signal in the preset time period and the level signal of the third connection point, and comprises:
the central processing module is further configured to determine whether the level signal of the third connection point is a high level according to the level signal of the pulse periodic signal in the preset time period;
the central processing module is further configured to determine that a fault state of disconnection occurs between any two of the three ports of the sensor when the level signal of the third connection point is a high level.
7. The alarm apparatus according to claim 4, wherein the central processing module is further configured to determine a fault state of the sensor according to the level signal of the pulse periodic signal in the preset time period and the level signal of the third connection point, and comprises:
the central processing module is further configured to determine whether the level signal of the third connection point is a low level according to the level signal of the pulse periodic signal in the preset time period;
the central processing module is further configured to determine a fault state of a short circuit between the third connection point and the second connection point when the level signal of the third connection point is a continuous low level.
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| CN201910540901.2A CN110264688B (en) | 2019-06-21 | 2019-06-21 | Alarm and alarm fault detection method |
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| CN201910540901.2A CN110264688B (en) | 2019-06-21 | 2019-06-21 | Alarm and alarm fault detection method |
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| DE3831193A1 (en) * | 1988-09-14 | 1990-03-29 | Wabco Westinghouse Fahrzeug | TRANSMITTER ERROR DETECTION CIRCUIT |
| CN100407237C (en) * | 2004-08-09 | 2008-07-30 | 深圳市世纪安软信息技术有限公司 | Alarm, alarm system and alarm method |
| JP2006126053A (en) * | 2004-10-29 | 2006-05-18 | Jidosha Denki Kogyo Co Ltd | Failure detection device |
| CN206557270U (en) * | 2016-12-15 | 2017-10-13 | 天津斯巴克瑞汽车电子股份有限公司 | A kind of primary current supervising device |
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