CN102798817B - A kind of relay fault detecting circuit and fault detection method thereof - Google Patents
A kind of relay fault detecting circuit and fault detection method thereof Download PDFInfo
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- CN102798817B CN102798817B CN201110138343.0A CN201110138343A CN102798817B CN 102798817 B CN102798817 B CN 102798817B CN 201110138343 A CN201110138343 A CN 201110138343A CN 102798817 B CN102798817 B CN 102798817B
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Abstract
A kind of relay fault detecting circuit, comprise the control section of relay, first resistance, second resistance, voltage source, transistor, voltage sampling unit and control module, transistor has base stage, collector and emitter, control section one end of relay is connected with power supply by the first resistance, the control section other end of relay is connected with the collector of transistor, the emitter of transistor is successively by the second resistance, voltage source ground connection, the base stage of transistor is connected with voltage sampling unit by control module, and a T point is established arbitrarily on the connecting line of control section one end of connection first resistance and relay, be connected by connecting line between voltage sampling unit with T point, according to the T point voltage value of voltage sampling unit collection, control module judges that specifically which part open circuit or relay break down, overcome staff in prior art due to relay fault origination point accurately cannot be determined and the drawback of correspondingly treatment measures is taked in inconvenience.
Description
Technical field
The present invention is specifically related to a kind of relay fault detecting circuit and fault detection method thereof.
Background technology
Along with technically keeping reforming, the use of relay is more and more frequent, and more convenient bring, but, if relay is once break down, then cannot carries out break-make exactly, thus bring serious potential safety hazard to electrical equipment.
Special failure detector circuit generally do not established by the control circuit of existing relay, but judged by the warning of other input voltages with electric parts, but cause the reason of fault may appear on the relay circuit of control distribution, therefore, this mode of prior art has following problem: one, the uncertainty of fault origination point, needs could to determine which parts breaks down through detailed diagnosis and causes; Even losing efficacy appears in two control relay circuits, also more difficult judging is the fault where open circuit or short circuit appear in circuit; Three, for some parts not having input voltage measurement, warning cannot be sent to relay unusual condition in time.
Summary of the invention
The present invention be solve existing relay control circuit owing to not establishing special failure detector circuit, cannot judge the technical matters that specifically which section wire harness or relay itself break down to provide a kind of relay fault detecting circuit and fault detection method thereof.
Technical scheme of the present invention is:
A kind of relay fault detecting circuit, comprise the control section of relay, first resistance, second resistance, voltage source, transistor, voltage sampling unit and control module, described transistor has base stage, collector and emitter, control section one end of described relay is connected with power supply by the first resistance, the control section other end of relay is connected with the collector of transistor, the emitter of transistor is successively by the second resistance, voltage source ground connection, the base stage of transistor is connected with voltage sampling unit by control module, and a T point is established arbitrarily on the connecting line of control section one end of connection first resistance and relay, be connected by connecting line between described voltage sampling unit with T point, for the voltage of Real-time Collection T point, control module judges specifically to belong to sampling section open circuit according to the T point voltage value of voltage sampling unit Real-time Collection, power unit open circuit, any fault in the control section short circuit of relay and control section open circuit, wherein, described sampling section open circuit refers to the open circuit between T point to voltage sampling unit, described power unit open circuit refers to the open circuit between power supply to T point, the control section short circuit of described relay refers to the short circuit between T point to S point, described control section open circuit refers to the open circuit between T point to S point, above-mentioned S point refers to any point connected on the control section other end of relay and the connecting line of transistor collector.
A kind of fault detection method of relay fault detecting circuit, relay fault detecting circuit comprises the control section of relay, first resistance, second resistance, voltage source, transistor, voltage sampling unit and control module, described transistor has base stage, collector and emitter, control section one end of described relay is connected with power supply by the first resistance, the control section other end of relay is connected with the collector of transistor, the emitter of transistor is successively by the second resistance, voltage source ground connection, the base stage of transistor is connected with voltage sampling unit by control module, and a T point is established arbitrarily on the connecting line of control section one end of connection first resistance and relay, be connected by connecting line between described voltage sampling unit with T point, wherein fault detection method comprises the following steps:
The voltage of step S1: voltage sampling unit Real-time Collection T point;
Step S2: control module judges specifically to belong to sampling section open circuit according to the T point voltage value of voltage sampling unit Real-time Collection, power unit open circuit, any fault in the control section short circuit of relay and control section open circuit, wherein, described sampling section open circuit refers to the open circuit between T point to voltage sampling unit, described power unit open circuit refers to the open circuit between power supply to T point, the control section short circuit of described relay refers to the short circuit between T point to S point, described control section open circuit refers to the open circuit between T point to S point, above-mentioned S point refers to any point connected on the control section other end of relay and the connecting line of transistor collector.
Advantage of the present invention: can learn from technique scheme of the present invention, a kind of relay fault detecting circuit is by comprising the control section of relay, first resistance, second resistance, voltage source, transistor, voltage sampling unit and control module, described transistor has base stage, collector and emitter, control section one end of described relay is connected with power supply by the first resistance, the control section other end of relay is connected with the collector of transistor, the emitter of transistor is successively by the second resistance, voltage source ground connection, the base stage of transistor is connected with voltage sampling unit by control module, and a T point is established arbitrarily on the connecting line of control section one end of connection first resistance and relay, be connected by connecting line between described voltage sampling unit with T point, for the voltage of Real-time Collection T point, according to the T point voltage value of voltage sampling unit collection, control module judges that specifically which part open circuit or relay break down.Compared to prior art, relay fault detecting circuit of the present invention can judge that specifically which part open circuit or relay break down well, avoid staff due to fault origination point accurately cannot be determined and the drawback of correspondingly treatment measures is taked in inconvenience, therefore the invention enables the fault detect of relay more reliably and more accurate.
In like manner, can learn from the technical scheme of the fault detection method of relay fault detecting circuit of the present invention, the fault detection method of relay fault detecting circuit of the present invention also can judge which part open circuit concrete or relay itself fail well, avoid staff due to fault origination point accurately cannot be determined and the drawback of correspondingly treatment measures is taked in inconvenience, therefore the invention enables the fault detection method of relay more reliably and more accurate.
Accompanying drawing explanation
The structured flowchart of the embodiment that Fig. 1 provides for invention relay failure detector circuit.
The method flow diagram of the embodiment that the fault detection method that Fig. 2 is invention relay failure detector circuit provides.
Embodiment
In order to make technical matters solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Before addressing detailed embodiments of the invention, it should be noted that, the present invention is the failure detector circuit to relay, and therefore, the present invention can be applicable to arbitrary circuit or the device with relay.
As shown in Figure 1, a kind of relay 1 failure detector circuit comprises the control section of relay 1, first resistance R1, second resistance R2, voltage source Uref, transistor Q1, voltage sampling unit 3 and control module 2, described transistor Q1 has base stage, collector and emitter, control section one end of described relay 1 is connected with power supply Us by the first resistance R1, the control section other end of relay 1 is connected with the collector of transistor Q1, the emitter of transistor Q1 is successively by the second resistance R2, voltage source Uref ground connection, the base stage of transistor Q1 is connected with voltage sampling unit 3 by control module 2, and a T point is established arbitrarily on the connecting line of control section one end of connection first resistance R1 and relay 1, be connected by connecting line between described voltage sampling unit 3 with T point, for the voltage of Real-time Collection T point, according to the T point voltage value that voltage sampling unit 3 gathers, control module 2 judges that specifically which part open circuit or relay 1 break down, thus make staff accurately can find out fault origination point and then take correspondingly treatment measures, bring more convenience therefore to the use of relay 1.
In concrete enforcement, the value of described voltage source Uref is less than the difference that supply voltage Us voltage deducts the rated operational voltage of relay 1.
In concrete enforcement, described control module 2 is ECU, and certainly, the control module 2 of the present embodiment is not limited to ECU, and the device that can also have above-mentioned arbitration functions for other, is not described in detail at this.
In concrete enforcement, described connecting line is wire harness, certainly can also have the connecting line of above-mentioned functions, such as wire etc. for other.
Present invention also offers a kind of fault detection method of relay 1 failure detector circuit, wherein, relay 1 failure detector circuit as shown in Figure 1, comprise the control section of relay 1, first resistance R1, second resistance R2, voltage source Uref, transistor Q1, voltage sampling unit 3 and control module 2, described transistor Q1 has base stage, collector and emitter, control section one end of described relay 1 is connected with power supply Us by the first resistance R1, the control section other end of relay 1 is connected with the collector of transistor Q1, the emitter of transistor Q1 is successively by the second resistance R2, voltage source Uref ground connection, the base stage of transistor Q1 is connected with voltage sampling unit 3 by control module 2, and a T point is established arbitrarily on the connecting line of control section one end of connection first resistance R1 and relay 1, be connected by connecting line between described voltage sampling unit 3 with T point, wherein fault detection method as shown in Figure 2, comprise the following steps:
Step 21: the voltage of voltage sampling unit 3 Real-time Collection T point;
Step 21: according to the T point voltage value of voltage sampling unit 3 Real-time Collection, control module 2 judges that specifically which part open circuit or relay 1 break down.Be understandable that, the control module 2 of this step also can judge specifically to belong to any fault in sampling section open circuit, power unit open circuit, the control section short circuit of relay and control section open circuit according to the T point voltage value of voltage sampling unit 3 Real-time Collection, consult Fig. 1, wherein
Sampling section open circuit refers to the open circuit between T point to voltage sampling unit 3;
Power unit open circuit refers to the open circuit between power supply Us to T point;
The control section short circuit of relay refers to the short circuit (understandably, comprising self short circuit of relay 1) between T point to S point;
Control section open circuit refers to the open circuit between T point to S point.
Above-mentioned S point refers to any point connected on the control section other end of relay and the connecting line of transistor Q1 collector.
Be understandable that, in the present embodiment, control module by control transistor whether conducting thus the control section of pilot relay (i.e. coil) whether electric, thus being closed or disconnection by control section (namely get an electric shock switch) of pilot relay.Due to, this is the state of the art, and is not main improvement of the present invention, therefore, is not described in detail this partial content.
In concrete enforcement, the value of described voltage source Uref is less than the difference that power supply Us voltage deducts the rated operational voltage of relay 1.
In concrete enforcement, described control module 2 is ECU.
As a preferred version of the present embodiment, any fault that above-mentioned control module 2 judges specifically to belong in sampling section open circuit, power unit open circuit, the control section short circuit of relay and control section open circuit according to the T point voltage value of voltage sampling unit 3 Real-time Collection is specially:
As the T point voltage value u that voltage sampling unit 3 gathers
twhen=0, control module 2 judges sampling section open circuit;
As the T point voltage value u that voltage sampling unit 3 gathers
tduring=uref, control module 2 judges the open circuit of power supply Us part;
As the T point voltage value u that voltage sampling unit 3 gathers
t=
time, control module 2 judges the control section short circuit of relay 1;
As the T point voltage value u that voltage sampling unit 3 gathers
tduring=Us, control module 2 judges control section open circuit; Wherein us is supply voltage, and r1 is the resistance of the first resistance, and r2 is the resistance of the second resistance, and uref is the terminal voltage of voltage source.
As the further preferred version of above-described embodiment, above-mentioned steps 23 also comprises, and according to the T point voltage value of voltage sampling unit 3 Real-time Collection, control module 2 judges that whether the whole control circuit of relay 1 is normal, wherein
As the T point voltage value u that voltage sampling unit 3 gathers
t=
time, control module 2 judges that the whole control circuit of relay 1 is normal, wherein us is supply voltage, r1 is the resistance of the first resistance, r2 is the resistance of the second resistance, r3 is the resistance (for art technology people, this is easy to obtain) of relay equivalent resistance, and uref is the terminal voltage of voltage source.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a relay fault detecting circuit, it is characterized in that, comprise the control section of relay, first resistance, second resistance, voltage source, transistor, voltage sampling unit and control module, described transistor has base stage, collector and emitter, control section one end of described relay is connected with power supply by the first resistance, the control section other end of relay is connected with the collector of transistor, the emitter of transistor is successively by the second resistance, voltage source ground connection, the base stage of transistor is connected with voltage sampling unit by control module, and a T point is established arbitrarily on the connecting line of control section one end of connection first resistance and relay, be connected by connecting line between described voltage sampling unit with T point, for the voltage of Real-time Collection T point, control module judges specifically to belong to sampling section open circuit according to the T point voltage value of voltage sampling unit Real-time Collection, power unit open circuit, any fault in the control section short circuit of relay and control section open circuit, wherein, described sampling section open circuit refers to the open circuit between T point to voltage sampling unit, described power unit open circuit refers to the open circuit between power supply to T point, the control section short circuit of described relay refers to the short circuit between T point to S point, described control section open circuit refers to the open circuit between T point to S point, above-mentioned S point refers to any point connected on the control section other end of relay and the connecting line of transistor collector.
2. relay fault detecting circuit according to claim 1, is characterized in that, the terminal voltage of described voltage source is less than the difference that supply voltage deducts the rated operational voltage of relay.
3. relay fault detecting circuit according to claim 1 and 2, is characterized in that, described control module is ECU.
4. relay fault detecting circuit according to claim 1 and 2, is characterized in that, described connecting line is wire harness.
5. the fault detection method of a relay fault detecting circuit, relay fault detecting circuit comprises the control section of relay, first resistance, second resistance, voltage source, transistor, voltage sampling unit and control module, described transistor has base stage, collector and emitter, control section one end of described relay is connected with power supply by the first resistance, the control section other end of relay is connected with the collector of transistor, the emitter of transistor is successively by the second resistance, voltage source ground connection, the base stage of transistor is connected with voltage sampling unit by control module, and a T point is established arbitrarily on the connecting line of control section one end of connection first resistance and relay, be connected by connecting line between described voltage sampling unit with T point, wherein fault detection method comprises the following steps:
The voltage of step S1: voltage sampling unit Real-time Collection T point;
Step S2: control module judges specifically to belong to sampling section open circuit according to the T point voltage value of voltage sampling unit Real-time Collection, power unit open circuit, any fault in the control section short circuit of relay and control section open circuit, wherein, described sampling section open circuit refers to the open circuit between T point to voltage sampling unit, described power unit open circuit refers to the open circuit between power supply to T point, the control section short circuit of described relay refers to the short circuit between T point to S point, described control section open circuit refers to the open circuit between T point to S point, above-mentioned S point refers to any point connected on the control section other end of relay and the connecting line of transistor collector.
6. the fault detection method of relay fault detecting circuit according to claim 5, is characterized in that, the terminal voltage of described voltage source is less than the difference that supply voltage deducts the rated operational voltage of relay.
7. the fault detection method of relay fault detecting circuit according to claim 5, is characterized in that, described control module is ECU.
8. the fault detection method of relay fault detecting circuit according to claim 7, is characterized in that,
As the T point voltage value u that voltage sampling unit gathers
twhen=0, control module judges sampling section open circuit;
As the T point voltage value u that voltage sampling unit gathers
tduring=uref, control module judges power unit open circuit;
As the T point voltage value u that voltage sampling unit gathers
t=
time, control module judges the control section short circuit of relay;
As the T point voltage value u that voltage sampling unit gathers
tduring=us, control module judges control section open circuit; Wherein us is supply voltage, and r1 is the resistance of the first resistance, and r2 is the resistance of the second resistance, and uref is the terminal voltage of voltage source.
9. the fault detection method of relay fault detecting circuit according to claim 8, is characterized in that, step S3 also comprises, and according to the T point voltage value of voltage sampling unit Real-time Collection, control module judges that whether the whole control circuit of relay is normal, wherein
As the T point voltage value u that voltage sampling unit gathers
t=
time, control module judges that the whole control circuit of relay is normal, and wherein us is supply voltage, and r1 is the resistance of the first resistance, and r2 is the resistance of the second resistance, and r3 is the resistance of relay equivalent resistance, and uref is the terminal voltage of voltage source.
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| CN201110138343.0A CN102798817B (en) | 2011-05-26 | 2011-05-26 | A kind of relay fault detecting circuit and fault detection method thereof |
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| CN201110138343.0A CN102798817B (en) | 2011-05-26 | 2011-05-26 | A kind of relay fault detecting circuit and fault detection method thereof |
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| CN102798817B true CN102798817B (en) | 2015-08-26 |
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Effective date of registration: 20180702 Address after: 518118 3001 and 3007 BYD Road, Pingshan street, Pingshan New District, Shenzhen, Guangdong Patentee after: BYD AUTOMOBILE INDUSTRY CO., LTD. Address before: 518118 BYD Road, Pingshan New District, Shenzhen, Guangdong 3009 Patentee before: Biyadi Co., Ltd. |