CN111751757A - Fault detection circuit and method for vehicle-mounted indicator lamp - Google Patents
Fault detection circuit and method for vehicle-mounted indicator lamp Download PDFInfo
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- CN111751757A CN111751757A CN202010713287.8A CN202010713287A CN111751757A CN 111751757 A CN111751757 A CN 111751757A CN 202010713287 A CN202010713287 A CN 202010713287A CN 111751757 A CN111751757 A CN 111751757A
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- 238000001514 detection method Methods 0.000 title claims abstract description 56
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- 238000012544 monitoring process Methods 0.000 claims description 16
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- 230000005283 ground state Effects 0.000 claims 1
- 238000003745 diagnosis Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/44—Testing lamps
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Abstract
The invention discloses a fault detection circuit of a vehicle-mounted indicating lamp, which judges whether the vehicle-mounted indicating lamp has a fault or not by circuit voltage values under the on-off state and the off state of a control switch, and comprises the following steps: a series circuit formed by the control switch (1) and a resistance current sensor (2) is connected with a parallel circuit formed by the vehicle-mounted indicator lamp (3) and the detection resistor (4); one end of the vehicle-mounted indicator lamp (3) is connected with the series circuit, and the other end of the vehicle-mounted indicator lamp is grounded; the detection resistor (4) comprises a first resistor R1 and a second resistor R2 which are connected in series, the first resistor R1 is connected with the series circuit, and the second resistor R2 is grounded; wherein one end of the series circuit is connected with a power supply (6). The method is simple, convenient to use, low in cost, accurate in detection and high in commercial value.
Description
Technical Field
The invention belongs to the field of automobile technology application, and particularly relates to a fault detection circuit and method of a vehicle-mounted indicator lamp.
Background
The automobile instrument panel is a device for reflecting the working condition of each system of the automobile. The vehicle-mounted indicating lamp is an indicating lamp in an automobile instrument panel, and has the functions of diagnosing various large systems on the automobile, feeding back the working conditions of various systems of the automobile in real time and showing the working conditions to a driver through various indicating meter indicating lamps.
The vehicle-mounted indicating lamp has very important significance on driving safety, and needs to remind users and manufacturers when a fault occurs, so that the manufacturers put forward higher requirements on fault diagnosis of the vehicle-mounted indicating lamp, and need part manufacturers to provide reliable and convenient diagnosis methods.
In the existing technical scheme, voltage short circuit diagnosis is performed aiming at ground short circuit and no in-place detection is provided, in the technical scheme, the functions of ground short circuit and voltage short circuit can only be realized, and if an indicator lamp is damaged or not installed, a prompt cannot be provided for a user, and the requirement of the user cannot be met; even if the technical scheme of on-site detection is available, a current detection device needs to be added, on-site detection of the indicator light is achieved by using the current sensor, if the indicator light is damaged or not installed, the current sensor can quickly detect that no current exists in the circuit and give an alarm, and prompt information is provided for a user, so that the requirement of a customer is met, and the use cost is undoubtedly increased.
At present, a technical scheme capable of solving the technical problems does not exist, and specifically, a fault detection circuit and a fault detection method for a vehicle-mounted indicator lamp do not exist.
Disclosure of Invention
In view of the technical defects in the prior art, an object of the present invention is to provide a fault detection circuit and method for a vehicle-mounted indicator light, according to an aspect of the present invention, a fault detection circuit for a vehicle-mounted indicator light is provided, which judges whether a fault occurs in the vehicle-mounted indicator light by a circuit voltage value in a state where a control switch is turned on and off, and includes:
the series circuit formed by the control switch and a resistance current sensor is connected with the parallel circuit formed by the vehicle-mounted indicating lamp and the detection resistor;
one end of the vehicle-mounted indicator lamp is connected with the series circuit, and the other end of the vehicle-mounted indicator lamp is grounded;
the detection resistor comprises a first resistor R1 and a second resistor R2 which are connected in series, the first resistor R1 is connected with the series circuit, and the second resistor R2 is grounded;
and one end of the series circuit is connected with a vehicle-mounted power supply.
Preferably, a detection unit is electrically connected between the first resistor R1 and the second resistor R2, and obtains a monitored voltage value at the point.
Preferably, a protection resistor R3 is connected in series with the vehicle-mounted indicator light and then forms the parallel circuit with the detection resistor.
Preferably, the control switch is a switch with a linkage control function, and can be automatically switched between a closed state and an open state.
Preferably, the detection unit respectively acquires the monitoring voltage value when the control switch is in a closed state and an open state, and judges whether the vehicle-mounted indicator lamp has a fault or not based on the monitoring voltage value.
According to another aspect of the invention, a control method for the fault detection circuit to perform fault judgment on the vehicle-mounted indicator lamp is provided, and the control method comprises the following steps:
a. respectively acquiring monitoring voltage values when the control switch is in a closed state and a disconnected state;
b. calculating a corresponding threshold value based on the monitoring voltage value;
c. and judging whether the vehicle-mounted indicator lamp breaks down or not based on the threshold value.
Preferably, when the control switch is at a value a in a closed state and the control switch is at 0V in an open state, the vehicle-mounted indicator lamp is in a normal state, where the value a is:
(VCC-Rs*I)*(R2/R1+R2)，
wherein, VCC is the voltage of vehicle power supply after filtering and protection, Rs is resistance value of resistance current sensor, I is series circuit's electric current, R1 represents first resistance R1's resistance value, R2 represents second resistance R2's resistance value.
Preferably, when the control switch is 0V in a closed state and the control switch is 0V in an open state, the vehicle-mounted indicator lamp is in a short-circuit state to ground.
Preferably, when the control switch is in a closed state and the control switch is in an open state, the vehicle-mounted indicator lamp is in a short-circuit state to a power supply, where the value B is:
VBAT*(R2/R1+R2)，
wherein VBAT represents a vehicle-mounted power supply voltage, R1 represents a resistance value of the first resistor R1, and R2 represents a resistance value of the second resistor R2.
Preferably, when the control switch is at the B value in the closed state and the control switch is at 0V in the open state, the on-vehicle indicator lamp is in the open state.
According to the invention, the vehicle-mounted indicator lamp diagnosis circuit is optimally designed, so that the dual requirements of performance and cost are met. The invention adopts the resistance current sensor which is obviously different from the prior art, and realizes the acquisition of the monitoring voltage value when the control switch is in a closed state and an open state; calculating a corresponding threshold value based on the monitoring voltage value; and judging whether the vehicle-mounted indicator lamp breaks down or not based on the threshold value. The invention can realize the in-place detection function of the vehicle-mounted indicating lamp under the condition of increasing little cost. The method is simple, convenient to use, low in cost, accurate in detection and high in commercial value.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic circuit diagram of a fault detection circuit of a vehicle-mounted indicator light according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a control method for determining a fault of an on-board indicator light according to another embodiment of the present invention; and
fig. 3 shows a truth table for fault detection for the first embodiment of the present invention.
Detailed Description
In order to better and clearly show the technical scheme of the invention, the invention is further described with reference to the attached drawings.
Fig. 1 shows a schematic circuit structure diagram of a fault detection circuit of a vehicle-mounted indicator light according to a specific embodiment of the present invention, and those skilled in the art understand that the present invention can be applied not only to the technical field of fault detection of vehicle-mounted indicator lights, but also to fault detection of other electronic devices, where a vehicle-mounted indicator light has a very important meaning to driving safety and needs to remind users and manufacturers when a fault occurs, so that manufacturers have a higher requirement for fault diagnosis of vehicle-mounted indicator lights, and need component manufacturers to provide a reliable and convenient diagnosis method, and the fault detection circuit and method of the vehicle-mounted indicator light provided by the present invention are different from a fault detection circuit without on-site detection and a fault detection circuit using a current sensor, and disclose an on-off state using a resistance current sensor in combination with a control switch, and comparing with a truth table so as to realize accurate grasp of the faults of the vehicle-mounted indicator lamp.
Specifically, the invention discloses a fault detection circuit of a vehicle-mounted indicator light, which judges whether the vehicle-mounted indicator light has a fault or not by circuit voltage values under the on-off state and the off state of a control switch, and the invention needs to carry out comprehensive analysis by combining truth value data under the on-off state and the off state of the control switch so as to determine whether the vehicle-mounted indicator light has the fault or not, and further determines which fault occurs, wherein the fault detection circuit comprises:
the control circuit is characterized in that a series circuit formed by the control switch 1 and the resistance current sensor 2 is connected with a parallel circuit formed by the vehicle-mounted indicator lamp 3 and the detection resistor 4, the control switch 1 is a switch with a linkage control function and can be automatically switched between a closed state and an open state, and the control switch 1 can be a manually controlled manual switch, a manually set automatic switch or an intelligently switched automatic switch. The resistance current sensor 2 can also be called as a current sensing resistor, and the resistance current sensor 2 is used for replacing a current sensor in the traditional meaning, so that the cost is reduced, and the detection efficiency and the detection accuracy are improved, wherein the control switch 1 is connected with the resistance current sensor 2 in series, and the vehicle-mounted indicator lamp 3 is connected with the detection resistor 4 in parallel.
Further, one end of the vehicle-mounted indicator light 3 is connected to the series circuit, and the other end is grounded, as shown in fig. 1, the upper left end of the vehicle-mounted indicator light 3 is connected to the series circuit where the resistance current sensor 2 is located, and the other end is grounded.
Further, the detection resistor 4 includes a first resistor R1 and a second resistor R2 connected in series, the first resistor R1 is connected to the series circuit, the other end of the first resistor R1 is connected to the second resistor R2, and the second resistor R2 is grounded. One end of the series circuit is connected with the power supply 6, the other end of the series circuit is connected with the parallel circuit, the vehicle-mounted power supply 6 is VBAT, namely the power supply voltage of the circuit, and the technical personnel in the field understand that VCC and VBAT are all paths of electricity and are vehicle-mounted power supplies, but VCC is only the voltage of the VBAT after filtering and protection, and the amplitude of the VCC is unchanged.
Further, a detecting unit 5 is electrically connected between the first resistor R1 and the second resistor R2 to obtain a monitored voltage value at this point, the detecting unit 5 is used to determine the monitored voltage value between the first resistor R1 and the second resistor R2, and is essentially a cpu, an analog-to-digital converter for converting an analog signal into a digital signal, in the present invention, the analog signal is mainly converted into a digital signal representing a proportional voltage value by the analog-to-digital converter.
Further, in a preferred embodiment, a protection resistor R3 is connected in series with the on-board indicator light 3 and then forms the parallel circuit with the detection resistor 4, and the protection resistor is a resistor used for protecting high-voltage testing equipment and a test sample, does not participate in the calculation of the truth table in the invention, and only plays a role in protection.
Further, the detecting unit 5 obtains the monitoring voltage values when the control switch is in the closed state and the open state, respectively, and determines whether the vehicle-mounted indicator lamp 3 has a fault based on the monitoring voltage values, in such an embodiment, when the control switch is in the closed state, the detecting unit 5 obtains one monitoring voltage value, and when the control switch is in the open state, the detecting unit 5 obtains another monitoring voltage value, and determines whether the vehicle-mounted indicator lamp 3 has a fault through the two monitoring voltage values, which fault occurs, the fault includes but is not limited to a short circuit to ground, a short circuit to a power supply, an open circuit, and the like, and these will not be described in detail in the later detailed description.
Fig. 2 is a detailed flow chart of a control method for vehicle-mounted indicator lamp fault judgment according to another embodiment of the present invention, and in conjunction with the embodiment shown in fig. 1, fig. 2 is intended to further describe the vehicle-mounted indicator lamp fault judgment performed by the fault detection circuit in the form of a control method, and includes the following steps:
first, step S101 is proceeded to, and monitoring voltage values are respectively obtained when the control switch is in a closed state and an open state, in such an embodiment, when the control switch is in a closed state, the detection unit 5 will obtain one monitoring voltage value, and when the control switch is in an open state, the detection unit 5 will obtain another monitoring voltage value.
Then, step S102 is performed, and a corresponding threshold value is calculated based on the monitored voltage value, which may be performed before, simultaneously with, or after step S101, that is, the threshold value at least includes an a value and a B value, where the a value is (VCC-Rs × I) (R2/R1+ R2), where VCC is the voltage value of the power supply, Rs is the resistance value of the resistance current sensor, I is the current of the series circuit, R1 represents the resistance value of the first resistor R1, and R2 represents the resistance value of the second resistor R2. The B value is VBAT (R2/R1+ R2), where VBAT represents a vehicle power supply voltage, R1 represents a resistance value of the first resistor R1, and R2 represents a resistance value of the second resistor R2.
Finally, step S103 is performed, and whether the vehicle-mounted indicator light fails is determined based on the threshold value, in such an embodiment, the invention will determine whether the vehicle-mounted indicator light fails with reference to fig. 3, specifically, fig. 3 shows a truth table of failure detection in the first embodiment of the invention, and those skilled in the art understand that it is necessary to determine whether the vehicle-mounted indicator light fails by referring to the voltage value of the detection unit when the control switch is in the on state and the off state.
As shown in fig. 3, when the control switch is at a value a in the closed state and the control switch is at 0V in the open state, the on-board indicator lamp is in the normal state, where the value a is:
(VCC-Rs*I)*(R2/R1+R2)，
wherein, VCC is the voltage of vehicle power supply after filtering and protection, Rs is resistance value of resistance current sensor, I is series circuit's electric current, R1 represents first resistance R1's resistance value, R2 represents second resistance R2's resistance value.
As shown in fig. 3, when the control switch is 0V in the closed state and the control switch is 0V in the open state, the on-vehicle indicator lamp is in a short-circuit state to ground.
Further, as shown in fig. 3, when the control switch is at a value B in the closed state and the control switch is at a value B in the open state, the on-board indicator lamp is in a short-circuit state with respect to the power supply, where the value B is:
VBAT*(R2/R1+R2)，
wherein VBAT represents a vehicle-mounted power supply voltage, R1 represents a resistance value of the first resistor R1, and R2 represents a resistance value of the second resistor R2.
Further, as shown in fig. 3, when the control switch is at a value B in the closed state and the control switch is at 0V in the open state, the on-vehicle indicator lamp is in the open state.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (10)
1. A fault detection circuit of a vehicle-mounted indicator lamp judges whether the vehicle-mounted indicator lamp has a fault or not by a circuit voltage value under the on and off states of a control switch, and is characterized by comprising:
a series circuit formed by the control switch (1) and a resistance current sensor (2) is connected with a parallel circuit formed by the vehicle-mounted indicator lamp (3) and the detection resistor (4);
one end of the vehicle-mounted indicator lamp (3) is connected with the series circuit, and the other end of the vehicle-mounted indicator lamp is grounded;
the detection resistor (4) comprises a first resistor R1 and a second resistor R2 which are connected in series, the first resistor R1 is connected with the series circuit, and the second resistor R2 is grounded;
wherein one end of the series circuit is connected with a vehicle-mounted power supply (6).
2. The fault detection circuit according to claim 1, wherein a detection unit (5) is electrically connected between the first resistor R1 and the second resistor R2 for obtaining the monitored voltage value at that point.
3. The fault detection circuit according to claim 1 or 2, characterized in that a protection resistor R3 is connected in series with the vehicle-mounted indicator light (3) and then forms the parallel circuit with the detection resistor (4).
4. A fault detection circuit according to any of claims 1 to 3, characterized in that the control switch (1) is a switch with a coordinated control function, which can be automatically switched between a closed and an open state.
5. The failure detection circuit according to any one of claims 1 to 4, wherein the detection unit (5) acquires the monitored voltage values in the closed and open states of the control switch, respectively, and determines whether the on-vehicle indicator lamp (3) has failed based on the monitored voltage values.
6. A control method for carrying out fault judgment on the vehicle-mounted indicator lamp according to the fault detection circuit of any one of claims 1 to 5, characterized by comprising the following steps:
a. respectively acquiring monitoring voltage values when the control switch is in a closed state and a disconnected state;
b. calculating a corresponding threshold value based on the monitoring voltage value;
c. and judging whether the vehicle-mounted indicator lamp breaks down or not based on the threshold value.
7. The control method according to claim 6, wherein the on-vehicle indicator lamp is in a normal state when the control switch is at a value a in a closed state and the control switch is at 0V in an open state, wherein the value a is:
(VCC-Rs*I)*(R2/R1+R2)，
wherein, VCC is the voltage of vehicle power supply after filtering and protection, Rs is resistance value of resistance current sensor, I is series circuit's electric current, R1 represents first resistance R1's resistance value, R2 represents second resistance R2's resistance value.
8. The control method according to claim 6 or 7, characterized in that the on-vehicle indicator lamp is in a short-circuit to ground state when the control switch is 0V in a closed state and the control switch is 0V in an open state.
9. The control method according to any one of claims 6 to 8, wherein when the control switch is a value B in a closed state and the control switch is a value B in an open state, the on-board indicator lamp is in a short-circuit state to a power supply, wherein the value B is:
VBAT*(R2/R1+R2)，
wherein VBAT represents a vehicle-mounted power supply voltage, R1 represents a resistance value of the first resistor R1, and R2 represents a resistance value of the second resistor R2.
10. The control method according to any one of claims 6 to 9, characterized in that the on-vehicle indicator lamp is in an open state when the control switch is a B value in a closed state and the control switch is 0V in an open state.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010713287.8A CN111751757A (en) | 2020-07-22 | 2020-07-22 | Fault detection circuit and method for vehicle-mounted indicator lamp |
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| CN202010713287.8A CN111751757A (en) | 2020-07-22 | 2020-07-22 | Fault detection circuit and method for vehicle-mounted indicator lamp |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113395800A (en) * | 2021-07-01 | 2021-09-14 | 广州朗国电子科技股份有限公司 | Indicating lamp control circuit |
| CN113687260A (en) * | 2021-08-26 | 2021-11-23 | Oppo广东移动通信有限公司 | Customer premises equipment, fault detection method of indicator lamp thereof and storage medium |
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| CN113687260A (en) * | 2021-08-26 | 2021-11-23 | Oppo广东移动通信有限公司 | Customer premises equipment, fault detection method of indicator lamp thereof and storage medium |
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