CN111044573B - Fault detection circuit and method for gas sensor - Google Patents
Fault detection circuit and method for gas sensor Download PDFInfo
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- CN111044573B CN111044573B CN201911190340.4A CN201911190340A CN111044573B CN 111044573 B CN111044573 B CN 111044573B CN 201911190340 A CN201911190340 A CN 201911190340A CN 111044573 B CN111044573 B CN 111044573B
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Abstract
The invention discloses a fault detection circuit and a method of a gas sensor, which are provided with a short circuit cut-off circuit, a heating wire detection circuit and the gas sensor, wherein the short circuit cut-off circuit is connected with the heating wire detection circuit, the heating wire detection circuit is connected with the gas sensor, and the gas sensor is connected with a power supply; under the condition that the heating wire detection circuit detects a short circuit, the short circuit cut-off circuit controls the heating wire detection circuit to be disconnected, so that the automatic short circuit protection function is realized, the response speed of the fault detection circuit is improved, and the problems that the fault detection of the gas sensor is not timely, and the fault of the sensor is misreported or is not reported are solved.
Description
Technical Field
The present disclosure relates to gas detection technologies, and particularly to a fault detection circuit and method for a gas sensor.
Background
A gas sensor is a sensor used to detect the concentration and composition of a gas, and is used to detect a sensitive gas in the environment. During transportation and use of the gas sensor, the internal connection of the gas sensor may generate short circuit or open circuit faults, and the internal short circuit of the gas sensor may cause the whole system to be incapable of working normally; in order to avoid the problems of false alarm and false alarm of sensitive gas caused by the fault of the gas sensor, the state of the gas sensor needs to be detected and notified in time by a certain fault detection method. However, in the related art, the fault detection method of the gas sensor generally requires a processor to participate in the shutdown of the protection circuit, so that the fault detection of the gas sensor requires a certain response time, and the fault detection manner is not direct enough.
Aiming at the problems that the fault detection of the gas sensor is not timely in the related technology and the fault of the sensor is reported by mistake or is not reported, an effective solution is not provided at present.
Disclosure of Invention
The invention provides a fault detection circuit and a fault detection method of a gas sensor, aiming at solving the problems that the fault detection of the gas sensor applied in the current market is not timely and the fault of the sensor is misreported or not reported.
According to an aspect of the present invention, there is provided a fault detection circuit of a gas sensor, the fault detection circuit including a short circuit breaking circuit, a heater wire detection circuit, and a gas sensor, wherein the short circuit breaking circuit is connected to the heater wire detection circuit, and the heater wire detection circuit is connected to the gas sensor;
the heating wire detection circuit is used for detecting the working state of the heating wire of the gas sensor;
the short circuit cut-off circuit is used for controlling the heating wire detection circuit to be disconnected under the condition that the heating wire detection circuit detects the short circuit, and is used for protecting the heating wire detection circuit.
In one embodiment, the short circuit cutoff circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor and a first triode, wherein the first end of the first resistor is grounded, and the second end of the first resistor is connected with the collector electrode of the first triode; the first end of the second resistor is connected with the base electrode of the first triode, the second end of the second resistor is connected with the first end of the third resistor, and the second end of the third resistor is grounded; and the emitting electrode of the first triode is connected with a power supply.
In one embodiment, the heater wire detection circuit includes a second triode, wherein an emitter of the second triode is grounded, a base of the second triode is connected with the short circuit switching circuit, and a collector of the second triode is connected with the heater wire of the gas sensor.
In one embodiment, the fault detection circuit further comprises a first signal conversion circuit and a processor, wherein the first signal conversion circuit is respectively connected with the short circuit breaking circuit, the heating wire detection circuit and the processor;
the processor detects the output signal of the first signal conversion circuit, and determines the working state of the heating wire of the gas sensor according to the value of the output signal.
In one embodiment, the fault detection circuit further comprises a second signal conversion circuit and a sensor circuit, wherein the second signal conversion circuit is connected with the sensor circuit, and the sensor circuit is connected with the gas sensor.
In one embodiment, the sensor detection circuit comprises a fourth resistor, wherein one end of the fourth resistor is grounded, and the other end of the fourth resistor is connected with the sensor of the gas sensor.
In one embodiment, the fault detection circuit further comprises a processor, wherein the second signal conversion circuit is connected with the sensitive detection circuit and the processor respectively;
the processor detects the output signal of the second signal conversion circuit and determines the working state of the sensitive body of the gas sensor according to the value of the output signal.
According to another aspect of the present invention, there is provided a fault detection method of a gas sensor, the fault detection circuit including a short circuit breaking circuit, a heater wire detection circuit, and the gas sensor, wherein the short circuit breaking circuit and the heater wire detection circuit are connected, and the heater wire detection circuit is connected to the gas sensor, the method including:
and under the condition that the short circuit is detected by the heating wire detection circuit, the short circuit cut-off circuit controls the heating wire detection circuit to be disconnected for protecting the heating wire detection circuit.
In one embodiment, the fault detection circuit further includes a first signal conversion circuit and a processor, wherein the first signal conversion circuit is connected to the heater wire detection circuit and the processor, respectively, and the detection of the short circuit by the heater wire detection circuit includes:
the processor detects the output signal of the first signal conversion circuit, and determines the working state of the heating wire of the gas sensor according to the value of the output signal.
In one embodiment, the fault detection circuit further comprises a second signal conversion circuit, a processor, and a sensor circuit, wherein the second signal conversion circuit is connected to the sensor circuit and the processor, respectively, and the sensor circuit is connected to the gas sensor, and the method further comprises:
the processor detects the output signal of the second signal conversion circuit and determines the working state of the sensitive body of the gas sensor according to the value of the output signal.
According to the invention, a short circuit cut-off circuit, a heating wire detection circuit and a gas sensor are arranged, wherein the short circuit cut-off circuit is connected with the heating wire detection circuit, the heating wire detection circuit is connected with the gas sensor, and the gas sensor is connected with a power supply; under the condition that the heating wire detection circuit detects a short circuit, the short circuit cut-off circuit controls the heating wire detection circuit to be disconnected, so that the automatic short circuit protection function is realized, the response speed of the fault detection circuit is improved, and the problems that the fault detection of the gas sensor is not timely, and the fault of the sensor is misreported or is not reported are solved.
Drawings
FIG. 1 is a block diagram of a fault detection circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of a fault detection circuit according to an embodiment of the present invention;
fig. 3 is a block diagram of a fault detection circuit according to an embodiment of the present invention;
FIG. 4 is a block diagram of a fault detection circuit according to an embodiment of the present invention;
FIG. 5 is a first schematic circuit diagram of a fault detection circuit according to an embodiment of the present invention;
FIG. 6 is a second schematic circuit diagram of a fault detection circuit according to an embodiment of the present invention;
fig. 7 is a circuit schematic diagram of a fault detection circuit according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be understood that although the terms first, second, third, etc. may be used to describe resistors, signals in embodiments of the present invention, these resistors, signals should not be limited to these terms. These terms are only used to distinguish between resistors and signals. For example, a first resistance may also be referred to as a second resistance, and similarly, a second resistance may also be referred to as a first resistance, without departing from the scope of embodiments of the present invention.
In the present embodiment, a fault detection circuit of a gas sensor is provided, and fig. 1 is a block diagram showing a structure of a fault detection circuit according to an embodiment of the present invention, as shown in fig. 1, the fault detection circuit includes a short circuit breaking circuit 12, a heater wire detection circuit 14, and a gas sensor 16, wherein the short circuit breaking circuit 12 is connected to the heater wire detection circuit 14, and the heater wire detection circuit 14 is connected to the gas sensor 16; wherein the gas sensor 16 may be of the type of a semiconductor gas sensor comprising a heating wire and a sensitive body; the heater wire detection circuit 14 is used for detecting the operating state of the heater wire of the gas sensor 16; in case the heater wire detection circuit 14 detects a short circuit of the heater wire, the short circuit breaking circuit 12 can timely break the circuit to protect the heater wire detection circuit 14.
Through the embodiment, the short circuit cut-off circuit 12 is connected with the heating wire detection circuit 14, the heating wire detection circuit 14 is connected with the gas sensor 16, the working state of the gas sensor 16 is automatically identified by utilizing a hardware circuit, a program is not needed to participate in circuit protection, certain response time is saved, the response speed of the fault detection circuit is improved, meanwhile, the short circuit cut-off circuit 12 is arranged, the automatic short circuit protection function is realized, and the problems that the fault detection of the gas sensor 16 is not timely, and the false alarm or the false alarm of the sensor fault exists are solved.
In one embodiment, there is provided a fault detection circuit of a gas sensor, the short circuit cut-off circuit 12 of the fault detection circuit including: the circuit comprises a first resistor, a second resistor, a third resistor and a first triode, wherein the first end of the first resistor is grounded, and the second end of the first resistor is connected with the collector of the first triode; the first end of the second resistor is connected with the base electrode of the first triode, the second end of the second resistor is connected with the first end of the third resistor, and the second end of the third resistor is grounded; the emitter of the first triode is connected with a power supply; wherein, in case of short circuit of the heating wire of the gas sensor 16, the first triode is cut off to prevent the heating wire detection circuit 14 from burning out; the first triode can also be replaced by other switch circuits, such as a P-channel Metal Oxide Semiconductor field effect transistor (PMOS transistor), or a switch diode.
With the above embodiment, the heater wire detection circuit 14 is short-circuited by using a switching circuit, such as a triode switching circuit, and in case of short circuit of the heater wire of the gas sensor 16, the switching circuit is automatically turned off without closing the loop by a processor, so that the heater wire detection circuit 14 is prevented from being burnt out, and thus, the loop is automatically cut off to protect the circuit.
In one embodiment, a fault detection circuit of a gas sensor is provided, the heater wire detection circuit 14 of the fault detection circuit comprises a second triode, wherein an emitter of the second triode is grounded, a base of the second triode is connected with the short circuit switching circuit, and a collector of the second triode is connected with a heater wire of the gas sensor; wherein, the working state of the heating wire of the gas sensor 16 is judged by the voltage value on the second triode; under the condition that the heating wire works normally, the second triode is conducted, and the voltage value on the second triode is a nonzero small-value reference quantity; under the condition that the heating wire is broken, the voltage value on the second triode is zero; in case of short circuit of the heating wire, the voltage value on the second triode is the power supply voltage.
With the above embodiment, the working state of the heater wire of the gas sensor 16 is detected by the heater wire detection circuit 14, so as to respond in time and correctly judge the fault condition of the heater wire of the gas sensor 16.
In one embodiment, a fault detection circuit of a gas sensor is provided, and fig. 2 is a block diagram of a fault detection circuit according to an embodiment of the present invention, and as shown in fig. 2, the fault detection circuit further includes a first signal conversion circuit 22 and a processor 24, wherein the first signal conversion circuit 22 includes a first analog-to-digital converter, and the first analog-to-digital converter is connected to the heater wire detection circuit 14 and the processor 24 respectively; wherein the heater wire detection circuit 14 in the fault detection circuit detects a continuous voltage, the continuous voltage is input to the first analog-digital converter, and a discrete voltage value is output; the processor 24 detects the output signal of the first adc, and determines the operating state of the heater wire of the gas sensor according to the value of the output signal.
In one embodiment, a fault detection circuit of a gas sensor is provided, and fig. 3 is a block diagram of a fault detection circuit according to an embodiment of the present invention, and as shown in fig. 3, the fault detection circuit further includes a second signal conversion circuit 32 and a sensor detection circuit 34, wherein the second signal conversion circuit 32 is connected to the sensor detection circuit 34, and the sensor detection circuit 34 is connected to the gas sensor 16.
Through the above embodiment, the second signal conversion circuit 32 is connected to the sensor detection circuit 34, and the sensor detection circuit 34 is connected to the gas sensor 16, so that the working state of the gas sensor is automatically identified by using a hardware circuit, and a program is not required to participate in circuit protection, thereby saving a certain response time, and improving the response speed of the fault detection circuit.
In one embodiment, a fault detection circuit for a gas sensor is provided, the sensor detection circuit 34 of the fault detection circuit comprising a fourth resistor, wherein one end of the fourth resistor is connected to ground and the other end of the fourth resistor is connected to the sensor of the gas sensor 16; sampling the voltage value of the fourth resistor to determine the working state of the sensitive body of the gas sensor 16, wherein the voltage value of the fourth resistor is greater than 0 and within a certain range under the condition that the sensitive body works normally; in the case of the open circuit of the sensitive body, the voltage value on the fourth resistor is 0V; in the case of short circuit of the sensor, the voltage value across the fourth resistor is the supply voltage.
With the above embodiment, the sensor detection circuit 54 is used to detect the operating state of the sensor body of the gas sensor 16, so as to respond in time and correctly determine the fault condition of the sensor body of the gas sensor 16.
In one embodiment, a fault detection circuit of a gas sensor is provided, fig. 4 is a block diagram of a fault detection circuit according to an embodiment of the present invention, and as shown in fig. 4, the fault detection circuit further includes a processor 24, wherein the second signal conversion circuit 32 is connected to the sensor detection circuit 34 and the processor 24 respectively; the second signal conversion circuit 32 is a second analog-to-digital converter, and the sensor detection circuit 34 detects a continuous voltage, which is input to the second analog-to-digital converter and outputs a discrete voltage value; the processor 24 detects the output signal of the second signal conversion circuit 32, and determines the working state of the sensitive body of the gas sensor 16 according to the value of the output signal.
In one embodiment, a fault detection circuit of a gas sensor is provided, and fig. 5 is a schematic circuit diagram of a fault detection circuit according to an embodiment of the present invention, i.e., as shown in fig. 5, the gas sensor 16 is a semiconductor gas sensor and is composed of a heating wire 52 and a sensing body 54, and the sensing body 54 can normally operate only when the heating wire 52 is heated; the heating wire 52 and the sensitive body 54 share a power supply.
One end of the heating wire 52 is connected with a power supply, and the other end is connected with a second triode T2 and is connected with a short circuit cut-off circuit which is composed of a first resistor R1, a second resistor R2, a third resistor R3, a first triode T1 and the like. When the heating wire 52 is normally operated, the second transistor T2 is turned on, and the power current flows through the heating wire and T2 to ground. At this time, the turn-on voltage of T2 is low, and most of the voltage drop is applied to the heating wire 52 to ensure that the heating wire 52 is normally heated. At this time, the processor 24 reads the voltage value 1 at the port of the first analog-to-digital converter (ADC1), where the voltage value 1 is a small non-zero reference, and is regarded as the normal working state of the heating wire 52; when the two sides of the heating wire 52 are broken, the first triode T1 and the second triode T2 are both turned off, no current flows through the third resistor R3, the processor 34 reads the voltage value 2 at the port of the ADC1, and the voltage value 2 is a reference amount close to zero and is regarded as the broken heating wire 52; under the condition that the two sides of the heating wire 52 are short-circuited, namely the power supply is short-circuited with the port of the ADC1, the first triode T1 is cut off, so that the second triode T2 is cut off, the T2 is timely closed, the second triode T2 is prevented from being damaged due to continuous heating, meanwhile, the processor reads the voltage value 3 of the port of the ADC1, the voltage value 3 is equal to the power supply voltage, and the heating wire 52 of the gas sensor 16 is regarded as short-circuited.
The sensing body 54 is connected to the power source at one end and connected to ground in series with a fourth resistor R4 at the other end, thereby dividing the power supply to the second analog-to-digital converter (ADC2) port of the processor 24. Under a certain heating condition, the sensitive body 54 reacts with the sensitive gas, and the resistance value of the sensitive body 54 is correspondingly reduced along with the gas concentration. After analog-to-digital conversion, the processor 24 reads the voltage value at the ADC2 port to determine the concentration and status of the sensitive gas. In the case of an open circuit on both sides of the sensor 54, the voltage at the ADC2 port is 0V, and the processor 24 is deemed to be open; in the case of a short circuit on both sides of the sensor 54, i.e., the power source is shorted to the ADC2, the voltage value at the ADC2 port is the power source voltage value, and the processor 24 is deemed as a short circuit. In general, the fourth resistor R4 has a relatively large resistance, and when short-circuited, the power supply is not affected, and the power supply does not need to be cut off.
Through the embodiment, the semiconductor type gas sensor is connected with a fault detection circuit, the fault detection circuit further comprises a short circuit cut-off circuit, the fault state of the heating wire of the sensor is automatically identified through a hardware circuit, and the automatic and rapid closing of the loop is realized under the condition that the heating wire is short-circuited. Compared with the prior art, the fault detection circuit does not need to judge the state of the heating wire through the sensitive body, does not need a program to participate in circuit protection, saves certain response time, and simultaneously can still realize the protection function of hardware in the abnormal state of the program, thereby improving the response efficiency and the safety performance of the fault detection circuit.
In an embodiment, a fault detection circuit of a gas sensor is provided, and fig. 6 is a circuit schematic diagram of a fault detection circuit according to an embodiment of the present invention, and as shown in fig. 6, a switching circuit in the fault detection circuit is implemented by a PMOS transistor, and a heating wire 52 of the gas sensor 16 has one end connected to a power supply and the other end connected to a second transistor T2, and is connected to a short circuit breaking circuit composed of a first resistor R1, a second resistor R2, a third resistor R3, and a PMOS transistor T1. The principle of fault detection of this circuit is similar to the above embodiments and will not be described herein.
In one embodiment, a fault detection circuit of a gas sensor is provided, fig. 7 is a schematic circuit diagram of a fault detection circuit according to an embodiment of the present invention, and as shown in fig. 7, the gas sensor 16 may also be a catalytic combustion gas sensor, the catalytic combustion gas sensor includes a detection element and a compensation element, the detection element and the compensation element are paired to form a wheatstone bridge, and under a normal operation condition of the catalytic combustion gas sensor, an operational amplifier connected to the wheatstone bridge outputs an electrical signal proportional to a concentration of a detection gas.
The catalytic combustion gas sensor is connected with the second triode T2 and is connected with a short circuit cut-off circuit which is composed of a first resistor R1, a second resistor R2, a third resistor R3, a first triode T1 and the like. When the catalytic combustion gas sensor is normally operated, the second transistor T2 is turned on, and a power current flows through the catalytic combustion gas sensor and T2 to ground. At this time, the on-voltage of T2 is very low, and the processor 24 reads the voltage value 1 at the ADC1 port, where the voltage value 1 is a small non-zero reference and is considered as a normal operating state; in the case where the detecting element or the compensating element of the catalytic combustion type gas sensor malfunctions, respectively, the bridge balance is broken, and the operational amplifier circuit outputs an electric signal exceeding the normal range; under the condition that the detection element and the compensation element are short-circuited at the same time, which is equivalent to that the power supply is short-circuited at the port of the ADC1, the first triode T1 is cut off, so that the second triode T2 is cut off, the T2 is timely turned off, and the second triode T2 is prevented from being damaged due to continuous heating, meanwhile, the processor 24 reads the voltage value 2 at the port of the ADC1, and the voltage value 2 is equal to the power supply voltage, which is regarded as that the gas sensor 16 is short-circuited.
Through the embodiment, the catalytic combustion type gas sensor is connected with a fault detection circuit, the fault detection circuit further comprises a short circuit cut-off circuit, and a loop is automatically cut off under the condition that the catalytic combustion type gas sensor is short-circuited, so that accidents are prevented, and the safety of the catalytic combustion type gas sensor is improved.
In the present embodiment, there is provided a fault detection method of a gas sensor, the fault detection circuit including a short circuit breaking circuit 12, a heater wire detection circuit 14, and a gas sensor 16, wherein the short circuit breaking circuit 12 and the heater wire detection circuit 14 are connected, and the heater wire detection circuit 14 and the gas sensor 16 are connected, the method including:
when the short circuit is detected by the heater wire detection circuit 14, the heater wire detection circuit 14 is controlled to be turned off by the short circuit cutoff circuit 12.
In one embodiment, there is provided a fault detection method of a gas sensor, the fault detection circuit further comprising a first signal conversion circuit 22 and a processor 24, wherein the first signal conversion circuit 22 is connected to the heater wire detection circuit 14 and the processor 24, respectively, and the heater wire detection circuit 14 detects the short circuit comprises:
the processor 24 detects the output signal of the first signal conversion circuit 22, and determines the working state of the heating wire of the gas sensor 16 according to the value of the output signal.
In one embodiment, a method for detecting a fault of a gas sensor is provided, the fault detection circuit further comprising a second signal conversion circuit 32, a processor 24 and a sensor circuit 34, wherein the second signal conversion circuit 32 is connected to the sensor circuit 34 and the processor 24, respectively, and the sensor circuit 34 is connected to the gas sensor 16, the method further comprising:
the processor 24 detects the output signal of the second signal conversion circuit 32, and determines the working state of the sensitive body of the gas sensor 16 according to the value of the output signal.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. The fault detection circuit of the gas sensor is characterized by comprising a short circuit cut-off circuit, a heating wire detection circuit and the gas sensor, wherein the short circuit cut-off circuit is connected with the heating wire detection circuit, and the heating wire detection circuit is connected with the gas sensor;
the heating wire detection circuit is used for detecting the working state of the heating wire of the gas sensor;
the short circuit cut-off circuit is used for controlling the heating wire detection circuit to be switched off under the condition that the heating wire detection circuit detects the short circuit, and is used for protecting the heating wire detection circuit;
the short circuit cutoff circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor and a first triode, wherein the first end of the first resistor is grounded, and the second end of the first resistor is connected with the collector electrode of the first triode; the first end of the second resistor is connected with the base electrode of the first triode, the second end of the second resistor is connected with the first end of the third resistor, and the second end of the third resistor is grounded; and the emitting electrode of the first triode is connected with a power supply.
2. The fault detection circuit according to claim 1, wherein the heater wire detection circuit comprises a second transistor, wherein an emitter of the second transistor is grounded, a base of the second transistor is connected to the short circuit switching circuit, and a collector of the second transistor is connected to the heater wire of the gas sensor.
3. The fault detection circuit according to any one of claims 1 to 2, further comprising a first signal conversion circuit and a processor, wherein the first signal conversion circuit is connected to the short circuit cutoff circuit, the heating wire detection circuit, and the processor, respectively;
the processor detects the output signal of the first signal conversion circuit, and determines the working state of the heating wire of the gas sensor according to the value of the output signal.
4. The fault detection circuit according to any one of claims 1 to 2, further comprising a second signal conversion circuit and a sensor circuit, wherein the second signal conversion circuit is connected to the sensor circuit and the sensor circuit is connected to the gas sensor.
5. The fault detection circuit of claim 4, wherein the sensor detection circuit comprises a fourth resistor, wherein one end of the fourth resistor is connected to ground, and the other end of the fourth resistor is connected to the sensor body of the gas sensor.
6. The fault detection circuit of claim 4, further comprising a processor, wherein the second signal conversion circuit is connected to the sensor detection circuit and the processor, respectively;
the processor detects the output signal of the second signal conversion circuit and determines the working state of the sensitive body of the gas sensor according to the value of the output signal.
7. A fault detection method of a gas sensor, wherein a fault detection circuit includes a short circuit breaking circuit, a heater wire detection circuit, and a gas sensor, wherein the short circuit breaking circuit is connected to the heater wire detection circuit, and the heater wire detection circuit is connected to the gas sensor, the method comprising:
and under the condition that the short circuit is detected by the heating wire detection circuit, the short circuit cut-off circuit controls the heating wire detection circuit to be disconnected for protecting the heating wire detection circuit.
8. The fault detection method according to claim 7, wherein the fault detection circuit further comprises a first signal conversion circuit and a processor, wherein the first signal conversion circuit is connected to the heater wire detection circuit and the processor, respectively, and the heater wire detection circuit detecting the short circuit comprises:
the processor detects the output signal of the first signal conversion circuit, and determines the working state of the heating wire of the gas sensor according to the value of the output signal.
9. The method of claim 7, wherein the fault detection circuit further comprises a second signal conversion circuit, a processor, and a sensor detection circuit, wherein the second signal conversion circuit is connected to the sensor detection circuit and the processor, respectively, and the sensor detection circuit is connected to the gas sensor, the method further comprising:
the processor detects the output signal of the second signal conversion circuit and determines the working state of the sensitive body of the gas sensor according to the value of the output signal.
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