CN212134892U - Fault detection circuit and electric automobile - Google Patents
Fault detection circuit and electric automobile Download PDFInfo
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- CN212134892U CN212134892U CN202020619372.3U CN202020619372U CN212134892U CN 212134892 U CN212134892 U CN 212134892U CN 202020619372 U CN202020619372 U CN 202020619372U CN 212134892 U CN212134892 U CN 212134892U
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Abstract
The application provides a fault detection circuit and electric automobile relates to new energy automobile technical field, and the fault detection circuit includes: the plurality of acquisition branches are used for acquiring electric signals at acquisition points; the multiplexer is used for outputting one of the plurality of electric signals from the output end of the multiplexer; the comparator is used for comparing the electric signal with a reference voltage and outputting a level signal; the processor is used for judging whether the relay connected with the corresponding acquisition branch circuit has a fault according to the level signal output by the comparator. Wherein, the signal of telecommunication of every collection point in the relay module can be gathered to a plurality of collection branches, converts level signal into in inputing to the comparator through the multiplexer to make the treater can judge whether the relay that corresponds collection branch connection has taken place the trouble according to level signal, guarantee that fault detection circuit can be accurate detect which relay has taken place the trouble in the relay module, thereby improved electric automobile's security.
Description
Technical Field
The application relates to the technical field of new energy vehicles, in particular to a fault detection circuit and an electric vehicle.
Background
With the development of technology, the new energy automobile industry in China is also rapidly developed, the adhesion of contacts of a high-voltage relay used for high-voltage power on and off of an electric automobile at present is a common fault of the new energy automobile, the contact state is difficult to monitor in real time due to the fact that high voltage and large current pass through the contacts of the high-voltage relay, the fault cannot be found in time, if the fault of the high-voltage relay cannot be detected in time, the high-voltage relay continues to work with 'faults', a rear-stage circuit can always bear the impact of load switching, when the high-voltage relay is turned off or closed again, large surge impact can be generated on the rear-stage circuit, the service life of the rear-stage circuit is seriously influenced, and the difficulty is increased. To this end, a relay with a feedback contact is generally used to determine the state of the high-voltage relay through a feedback signal fed back by the feedback contact, but the relay with the feedback contact is prone to failure of the feedback contact, so that the problem that the state of the high-voltage relay cannot be accurately determined is solved.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the application is to provide a fault detection circuit and an electric vehicle, so as to solve the problem that the state of a high-voltage relay cannot be accurately judged in the prior art.
The embodiment of the application provides a fault detection circuit for relay module to electric automobile detects, relay module includes a plurality of relays, fault detection circuit includes: one end of each acquisition branch is connected with an acquisition point of the relay respectively so as to acquire an electric signal at the acquisition point; the multiplexer is respectively connected with the plurality of acquisition branches and is used for outputting one of the electric signals acquired by the plurality of acquisition branches from the output end of the multiplexer; the multiplexer is used for receiving the electrical signal and outputting a corresponding level signal, and the multiplexer is used for multiplexing the electrical signal and the reference voltage; and the processor is connected with the output end of the comparator and is used for judging whether the relay connected with the corresponding acquisition branch circuit has a fault according to the level signal output by the comparator.
In the implementation process, a plurality of acquisition branches in the fault detection circuit can acquire the electric signal of each acquisition point in the relay module, and the electric signal is input into the comparator through the multiplexer to convert the electric signal into a level signal, so that the processor can judge whether the relay connected with the corresponding acquisition branches has a fault according to the level signal, and the fault detection circuit can accurately detect which relay in the relay module has a fault, thereby improving the safety of the electric automobile.
Optionally, an input end of the comparator is connected to the output end of the multiplexer, and another input end of the comparator is connected to a reference voltage, when the electrical signal is greater than the reference voltage, the output end of the comparator outputs a low level, and when the electrical signal is less than the reference voltage, the output end of the comparator outputs a high level.
Optionally, each of the collecting branches includes a first current limiting unit and a second current limiting unit; one end of the first current limiting unit is connected with the acquisition point, and the other end of the first current limiting unit is connected with one input end of the multiplexer; one end of the second current limiting unit is connected with the input end, and the other end of the second current limiting unit is grounded.
In the implementation process, the electric signals collected at the collection point can be changed into smaller electric signals after passing through the current limiting unit, so that the safe operation of the comparator can be ensured, and the fault detection circuit can accurately detect faults.
Optionally, the first current limiting unit includes one resistor or at least two resistors connected in series.
Optionally, the second current limiting unit includes one resistor or at least two resistors connected in series.
In a second aspect, an electric vehicle comprises a whole vehicle electrical device, a relay module and a fault detection circuit; the relay module is connected with the whole vehicle electrical equipment and used for electrifying the whole vehicle electrical equipment; the relay module comprises a plurality of relays; the fault detection circuit includes: the system comprises a plurality of acquisition branches, a multiplexer, a comparator and a processor; one end of each acquisition branch is respectively connected with an acquisition point of the relay so as to acquire an electric signal at the acquisition point; the multiplexer is respectively connected with the plurality of collecting branches and is used for outputting one of the electric signals collected by the plurality of collecting branches from the output end of the multiplexer; one input end of the comparator is connected with the output end of the multiplexer, the other input end of the comparator is connected with a reference voltage, and the comparator is used for comparing the electric signal with the reference voltage so as to output a corresponding level signal; and the processor is connected with the output end of the comparator and is used for judging whether the relay connected with the corresponding acquisition branch circuit fails or not according to the level signal output by the comparator.
In the implementation process, a plurality of acquisition branches in the fault detection circuit can acquire the electric signal of each acquisition point in the relay module, and the electric signal is input into the comparator through the multiplexer to convert the electric signal into a level signal, so that the processor can judge whether the relay connected with the corresponding acquisition branches has a fault according to the level signal, and the fault detection circuit can accurately detect which relay in the relay module has a fault, thereby improving the safety of the electric automobile.
Optionally, the electric vehicle includes a battery pack, and the relay module includes: the main drive relay is respectively connected with the battery pack and the whole vehicle electrical equipment and is used for electrifying the whole vehicle electrical equipment; the auxiliary drive relay is connected with the main drive relay in parallel and is respectively connected with the battery pack and the whole vehicle electrical equipment so as to electrify the whole vehicle electrical equipment; the plurality of collection branches comprise: one end of the first acquisition branch is connected with the output end of the main drive relay, and the other end of the first acquisition branch is connected with one input end of the multiplexer so as to obtain an electric signal at an acquisition point of the main drive relay; and one end of the second acquisition branch is connected with the output end of the auxiliary drive relay, and the other end of the second acquisition branch is connected with one input end of the multiplexer so as to acquire an electric signal at the acquisition point of the auxiliary drive relay.
Optionally, the relay module further includes: the input end of the main drive pre-charging circuit is connected with the anode of the battery pack, and the output end of the main drive pre-charging circuit is connected with the electric equipment of the whole vehicle; the main drive pre-charging circuit comprises a main drive pre-charging relay, a first resistor, a second resistor, a first anti-reverse diode and a capacitor; the main drive pre-charging relay, the first resistor and the first anti-reverse diode are connected in series to form a first series circuit, the first series circuit and the main drive relay are connected in parallel to form a first parallel circuit, and the first parallel circuit is connected in series with the second resistor and the capacitor which are connected in parallel; the plurality of collection branches further comprises: and one end of the third acquisition branch is connected with the output end of the main drive pre-charging relay, and the other end of the third acquisition branch is connected with one input end of the multiplexer so as to acquire an electric signal at the acquisition point of the main drive pre-charging relay.
Optionally, the relay module further includes: the input end of the auxiliary drive pre-charging circuit is connected with the positive electrode of the battery pack, and the output end of the auxiliary drive pre-charging circuit is connected with the electric equipment of the whole vehicle; the auxiliary drive pre-charging circuit comprises an auxiliary drive pre-charging relay, a third resistor, a fourth resistor, a fifth resistor and a second anti-reverse diode; the auxiliary drive pre-charging relay, the third resistor and the second anti-reverse diode are connected in series to form a second series circuit, and the second series circuit is connected in series with the fourth resistor and the fifth resistor which are connected in parallel; the plurality of collection branches further comprises: and one end of the fourth acquisition branch is connected with the output end of the auxiliary driving pre-charging relay, and the other end of the fourth acquisition branch is connected with one input end of the multiplexer so as to acquire an electric signal at the acquisition point of the auxiliary driving pre-charging relay.
Optionally, the whole vehicle electrical equipment comprises a driving motor module, an oil pump motor module and an air pump motor module.
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 block diagram of a structure of an electric vehicle according to an embodiment of the present application;
fig. 2 is a circuit diagram of a fault detection circuit according to an embodiment of the present application;
fig. 3 is a schematic internal circuit diagram of an electric vehicle according to an embodiment of the present application.
Icon: 100-vehicle electrical equipment; 110-driving motor module; 120-oil pump motor module; 130-air pump motor module; 200-a relay module; 210-a main drive relay; 220-auxiliary drive relay; 230-main drive pre-charge relay; 240-auxiliary drive pre-charge relay; 310-collection branch; 320-a multiplexer; 330-a comparator; 340-a processor; 400-battery pack.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 some embodiments of the present application, but not all 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 given herein 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.
In the description of the present application, it is noted that the terms "first", "second", "third", and the like are used merely for distinguishing between descriptions and are not intended to indicate or imply relative importance.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Additional features and advantages of the 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 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.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a schematic block diagram of a structure of an electric vehicle according to an embodiment of the present disclosure, where the electric vehicle includes a complete vehicle electrical device 100, a relay module 200, and a fault detection circuit; the relay module 200 is connected with the whole vehicle electrical equipment 100 and used for electrifying the whole vehicle electrical equipment 100; the relay module 200 includes a plurality of relays, and the connection relationship between the plurality of relays in the relay module 200 is not shown in fig. 1; the fault detection circuit includes: a plurality of acquisition branches 310, a multiplexer 320, a comparator 330, and a processor 340; one end of each acquisition branch 310 is connected with an acquisition point of a relay respectively for acquiring an electric signal at the acquisition point; the multiplexer 320 is connected to the plurality of collecting branches 310, respectively, for outputting one of the electrical signals collected by the plurality of collecting branches 310 from an output terminal of the multiplexer 320; one input end of the comparator 330 is connected to the output end of the multiplexer 320, and the other input end thereof is connected to a reference voltage, the comparator 330 is configured to compare the electrical signal with the reference voltage to output a corresponding level signal; the processor 340 is connected to the output terminal of the comparator 330, and is configured to determine whether a relay connected to the corresponding acquisition branch 310 fails according to the level signal output by the comparator 330.
In the implementation process, a plurality of acquisition branches 310 in the fault detection circuit can acquire the electric signal of each acquisition point in the relay module 200, and the electric signal is input into the comparator 330 through the multiplexer 320 to convert the electric signal into a level signal, so that the processor 340 can judge whether the relay connected with the corresponding acquisition branch 310 has a fault according to the level signal, and the fault detection circuit can accurately detect which relay in the relay module 200 has a fault, thereby improving the safety of the electric vehicle.
Referring to fig. 2, fig. 2 is a circuit diagram of a fault detection circuit according to an embodiment of the present disclosure, the fault detection circuit is used for detecting a relay module 200 of an electric vehicle, the relay module 200 includes a plurality of relays, and the fault detection circuit includes: a plurality of collecting branches 310, wherein one end of each collecting branch 310 is connected with a collecting point of a relay respectively for obtaining an electric signal at the collecting point; a multiplexer 320 connected to the plurality of collecting branches 310, respectively, for outputting one of the electrical signals collected by the plurality of collecting branches 310 from an output terminal of the multiplexer 320; a comparator 330, one input end of which is connected to the output end of the multiplexer 320, and the other input end of which is connected to the reference voltage, the comparator 330 being configured to compare the electrical signal with the reference voltage to output a corresponding level signal; and the processor 340 is connected with the output end of the comparator 330, and is used for judging whether the relay connected with the corresponding acquisition branch 310 is in fault according to the level signal output by the comparator 330.
Specifically, as shown in fig. 2, the fault detection circuit includes three acquisition branches 310, three acquisition ends a, b, and c, which are connected to acquisition points set at the relay in the relay module 200 to obtain electrical signals at the corresponding acquisition points, the acquired electrical signals pass through the acquisition branches 310 and then reach the input port of the multiplexer 320, the output port of the multiplexer 320 is connected to the comparator 330, the electrical signals passing through the comparator 330 are compared with the reference electrical signals, the comparator 330 can output level signals correspondingly, and the processor 340 determines whether the relay corresponding to the location where the acquisition point is set has a fault according to the level signals.
For example, when it is required to determine whether a relay corresponding to the collection point setting location collected by the collection end a fails, the S3 switch of the multiplexer 320 is turned on and closed, so that the electrical signal passing through the collection branch 310 can be input to the comparator 330, after the comparator 330 is in the reference electrical signal for comparison, the comparator 330 outputs a level signal to the processor 340, and when the operation is specific, the processor 340 may be an MCU control unit, the MCU control unit may be connected to each relay in the relay module 200 and the multiplexer 320, so that the MCU control unit may send a control signal to each relay in the relay module 200, and simultaneously may control one of the switches in the multiplexer 320 to be turned on, and after receiving the level signal passing through the comparator 330, the MCU control unit may determine whether the relay fails according to the level signal and the control signal sent to the relay, the level signal and the control signal sent to the relay can be further processed to display the adhesion state of the relay.
As shown in fig. 2, one input terminal of the comparator 330 is connected to the output terminal of the multiplexer 320, and the other input terminal thereof is connected to the reference voltage, and the other input terminal of the comparator 330 in fig. 2 is connected to ground, so that the reference voltage signal is 0, when the electrical signal is greater than the reference voltage, the output terminal of the comparator 330 outputs a low level, and when the electrical signal is less than the reference voltage, the output terminal of the comparator 330 outputs a high level.
In the implementation process, a plurality of acquisition branches 310 in the fault detection circuit acquire the electric signal of each acquisition point in the relay module 200, and then input the electric signal into the comparator 330 through the multiplexer 320 to convert the electric signal into a level signal, then the processor 340 judges whether the relay connected with the corresponding acquisition branch 310 has a fault according to the level signal, and ensures that the fault detection circuit can accurately detect which relay in the relay module 200 has a fault, thereby improving the safety of the electric vehicle.
The number of the collecting branches 310 in the fault detection circuit can be specifically set according to the number of collecting points arranged in the relay module 200, and each collecting branch 310 comprises a first current limiting unit and a second current limiting unit; one end of the first current limiting unit is connected with the acquisition point, and the other end of the first current limiting unit is connected with one input end of the multiplexer 320; one end of the second current limiting unit is connected with the input end, and the other end of the second current limiting unit is grounded. The electrical signal collected by the collecting branch 310 from the collecting point is input from the input end of the multiplexer 320 after passing through the first current limiting unit and the second current limiting unit, because the voltage signal or the current signal of the collecting point in the relay module 200 is large, the comparator 330 is damaged when the electrical signal is directly input to the comparator 330 through the multiplexer 320, the large voltage signal and the large current signal collected by the collecting point can be changed into small voltage signals and small current signals after passing through the first current limiting unit and the second current limiting unit in the collecting branch 310, and the safe operation of the comparator 330 is ensured.
The first current limiting unit comprises a resistor or at least two resistors connected in series, and the second current limiting unit comprises a resistor or at least two resistors connected in series. As shown in fig. 2, the first current limiting unit in the first acquisition branch 310 includes a resistor R1, a resistor R2, a resistor R3, and a resistor R4, the second current limiting unit includes a resistor R5, the first current limiting unit in the second acquisition branch 310 includes a resistor R6, a resistor R7, a resistor R8, and a resistor R9, the second current limiting unit includes a resistor R10, the first current limiting unit in the third acquisition branch 310 includes a resistor R11, a resistor R12, a resistor R13, and a resistor R14, and the second current limiting unit includes a resistor R15.
Referring to fig. 3, fig. 3 is a schematic diagram of an internal circuit of an electric vehicle according to an embodiment of the present disclosure, and a complete vehicle electrical device 100 includes a driving motor module 110, an oil pump motor module 120, and an air pump motor module 130.
The electric vehicle includes a battery pack 400, and the relay module 200 includes: a main drive relay 210 connected to the battery pack 400 and the entire vehicle electrical device 100, respectively, for powering up the entire vehicle electrical device 100; the auxiliary drive relay 220 is connected with the main drive relay 210 in parallel and is respectively connected with the battery pack 400 and the whole vehicle electrical equipment 100, so as to power up the whole vehicle electrical equipment 100; the output of auxiliary drive relay 220 is connected with air pump motor controller through parallelly connected resistance R21 and R22, and the collection branch road 310 that corresponds this moment has two, includes: one end of the first collecting branch is connected with the output end of the main drive relay 210, and the other end of the first collecting branch is connected with one input end of the multiplexer 320, so as to obtain an electric signal at a collecting point of the main drive relay 210; and a second collecting branch, one end of which is connected to the output end of the auxiliary drive relay 220, and the other end of which is connected to one input end of the multiplexer 320, so as to obtain the electrical signal at the collecting point of the auxiliary drive relay 220.
Optionally, the relay module 200 further includes: the input end of the main drive pre-charging circuit is connected with the anode of the battery pack 400, and the output end of the main drive pre-charging circuit is connected with the electric equipment 100 of the whole vehicle; the main drive pre-charging circuit comprises a main drive pre-charging relay 230, a first resistor R16, a second resistor R17, a first anti-reverse diode D1 and a capacitor C1; the main drive pre-charging relay 230 is connected with a first resistor R16 and a first anti-reverse diode in series to form a first series circuit, the first series circuit is connected with the main drive relay 210 in parallel to form a first parallel circuit, and the first parallel circuit is connected with a second resistor and a capacitor which are connected in parallel in series; the collection branch 310 further includes: and a third collecting branch, one end of which is connected to the output terminal of the main driving pre-charge relay 230, and the other end of which is connected to one input terminal of the multiplexer 320, for obtaining the electrical signal at the collecting point of the main driving pre-charge relay 230.
Optionally, the relay module 200 further includes: the input end of the auxiliary drive pre-charging circuit is connected with the anode of the battery pack 400, and the output end of the auxiliary drive pre-charging circuit is connected with the electric equipment 100 of the whole vehicle; the auxiliary drive pre-charging circuit comprises an auxiliary drive pre-charging relay 240, a third resistor R18, a fourth resistor R19, a fifth resistor R20 and a second anti-reverse diode D2; the auxiliary drive pre-charging relay 240 is connected in series with the third resistor and the second anti-reverse diode to form a second series circuit, and the second series circuit is connected in series with the fourth resistor and the fifth resistor which are connected in parallel; the collection branch 310 further includes: one end of the fourth collecting branch 310 is connected to the output end of the auxiliary driving pre-charge relay 240, and the other end thereof is connected to one input end of the multiplexer 320, so as to obtain the electrical signal at the collecting point of the auxiliary driving pre-charge relay 240.
To sum up, this application provides a fault detection circuit and electric automobile for relay module 200 to electric automobile detects, and relay module 200 includes a plurality of relays, and fault detection circuit includes: a plurality of collecting branches 310, wherein one end of each collecting branch 310 is connected with a collecting point of a relay respectively for obtaining an electric signal at the collecting point; a multiplexer 320 connected to the plurality of collecting branches 310, respectively, for outputting one of the electrical signals collected by the plurality of collecting branches 310 from an output terminal of the multiplexer 320; a comparator 330, one input end of which is connected to the output end of the multiplexer 320, and the other input end of which is connected to the reference voltage, the comparator 330 being configured to compare the electrical signal with the reference voltage to output a corresponding level signal; and the processor 340 is connected with the output end of the comparator 330, and is used for judging whether the relay connected with the corresponding acquisition branch 310 is in fault according to the level signal output by the comparator 330. The electric signals of each acquisition point in the relay module 200 can be acquired by a plurality of acquisition branches 310 in the fault detection circuit, and are input into the comparator 330 through the multiplexer 320 to convert the electric signals into level signals, so that the processor 340 can judge whether the relay connected with the corresponding acquisition branch 310 has a fault according to the level signals, and the fault detection circuit can accurately detect which relay in the relay module 200 has a fault, thereby improving the safety of the electric automobile.
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.
Claims (10)
1. The utility model provides a fault detection circuit for detect electric automobile's relay module, the relay module includes a plurality of relays, its characterized in that, fault detection circuit includes:
one end of each acquisition branch is connected with an acquisition point of the relay respectively so as to acquire an electric signal at the acquisition point;
the multiplexer is respectively connected with the plurality of acquisition branches and is used for outputting one of the electric signals acquired by the plurality of acquisition branches from the output end of the multiplexer;
the multiplexer is used for receiving the electrical signal and outputting a corresponding level signal, and the multiplexer is used for multiplexing the electrical signal and the reference voltage;
and the processor is connected with the output end of the comparator and is used for judging whether the relay connected with the corresponding acquisition branch circuit has a fault according to the level signal output by the comparator.
2. The circuit of claim 1, wherein an input terminal of the comparator is connected to the output terminal of the multiplexer, and another input terminal thereof is connected to a reference voltage, and wherein the output terminal of the comparator outputs a low level when the electrical signal is greater than the reference voltage, and outputs a high level when the electrical signal is less than the reference voltage.
3. The circuit of claim 1, wherein each of the collection branches includes a first current limiting unit and a second current limiting unit;
one end of the first current limiting unit is connected with the acquisition point, and the other end of the first current limiting unit is connected with one input end of the multiplexer;
one end of the second current limiting unit is connected with the input end, and the other end of the second current limiting unit is grounded.
4. The circuit of claim 3, wherein the first current limiting unit comprises one resistor or at least two resistors connected in series.
5. The circuit of claim 4, wherein the second current limiting unit comprises one resistor or at least two resistors connected in series.
6. An electric automobile is characterized by comprising electric equipment of the whole automobile, a relay module and a fault detection circuit;
the relay module is connected with the whole vehicle electrical equipment and used for electrifying the whole vehicle electrical equipment;
the relay module comprises a plurality of relays; the fault detection circuit includes: the system comprises a plurality of acquisition branches, a multiplexer, a comparator and a processor;
one end of each acquisition branch is respectively connected with an acquisition point of the relay so as to acquire an electric signal at the acquisition point;
the multiplexer is respectively connected with the plurality of collecting branches and is used for outputting one of the electric signals collected by the plurality of collecting branches from the output end of the multiplexer;
one input end of the comparator is connected with the output end of the multiplexer, the other input end of the comparator is connected with a reference voltage, and the comparator is used for comparing the electric signal with the reference voltage so as to output a corresponding level signal;
and the processor is connected with the output end of the comparator and is used for judging whether the relay connected with the corresponding acquisition branch circuit fails or not according to the level signal output by the comparator.
7. The electric vehicle of claim 6, wherein the electric vehicle includes a battery pack, and wherein the relay module comprises:
the main drive relay is respectively connected with the battery pack and the whole vehicle electrical equipment and is used for electrifying the whole vehicle electrical equipment;
the auxiliary drive relay is connected with the main drive relay in parallel and is respectively connected with the battery pack and the whole vehicle electrical equipment so as to electrify the whole vehicle electrical equipment;
the plurality of collection branches comprise:
one end of the first acquisition branch is connected with the output end of the main drive relay, and the other end of the first acquisition branch is connected with one input end of the multiplexer so as to obtain an electric signal at an acquisition point of the main drive relay;
and one end of the second acquisition branch is connected with the output end of the auxiliary drive relay, and the other end of the second acquisition branch is connected with one input end of the multiplexer so as to acquire an electric signal at the acquisition point of the auxiliary drive relay.
8. The electric vehicle of claim 7, wherein the relay module further comprises:
the input end of the main drive pre-charging circuit is connected with the anode of the battery pack, and the output end of the main drive pre-charging circuit is connected with the electric equipment of the whole vehicle;
the main drive pre-charging circuit comprises a main drive pre-charging relay, a first resistor, a second resistor, a first anti-reverse diode and a capacitor;
the main drive pre-charging relay, the first resistor and the first anti-reverse diode are connected in series to form a first series circuit, the first series circuit and the main drive relay are connected in parallel to form a first parallel circuit, and the first parallel circuit is connected in series with the second resistor and the capacitor which are connected in parallel;
the plurality of collection branches further comprises:
and one end of the third acquisition branch is connected with the output end of the main drive pre-charging relay, and the other end of the third acquisition branch is connected with one input end of the multiplexer so as to acquire an electric signal at the acquisition point of the main drive pre-charging relay.
9. The electric vehicle of claim 7, wherein the relay module further comprises:
the input end of the auxiliary drive pre-charging circuit is connected with the positive electrode of the battery pack, and the output end of the auxiliary drive pre-charging circuit is connected with the electric equipment of the whole vehicle;
the auxiliary drive pre-charging circuit comprises an auxiliary drive pre-charging relay, a third resistor, a fourth resistor, a fifth resistor and a second anti-reverse diode;
the auxiliary drive pre-charging relay, the third resistor and the second anti-reverse diode are connected in series to form a second series circuit, and the second series circuit is connected in series with the fourth resistor and the fifth resistor which are connected in parallel;
the plurality of collection branches further comprises:
and one end of the fourth acquisition branch is connected with the output end of the auxiliary driving pre-charging relay, and the other end of the fourth acquisition branch is connected with one input end of the multiplexer so as to acquire an electric signal at the acquisition point of the auxiliary driving pre-charging relay.
10. The electric automobile of claim 6, characterized in that the vehicle electrical equipment comprises a driving motor module, an oil pump motor module and an air pump motor module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020619372.3U CN212134892U (en) | 2020-04-22 | 2020-04-22 | Fault detection circuit and electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020619372.3U CN212134892U (en) | 2020-04-22 | 2020-04-22 | Fault detection circuit and electric automobile |
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| CN212134892U true CN212134892U (en) | 2020-12-11 |
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| CN202020619372.3U Active CN212134892U (en) | 2020-04-22 | 2020-04-22 | Fault detection circuit and electric automobile |
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| CN (1) | CN212134892U (en) |
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2020
- 2020-04-22 CN CN202020619372.3U patent/CN212134892U/en active Active
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