CN212932907U - Fault detection circuit of vehicle-mounted indicator lamp - Google Patents
Fault detection circuit of vehicle-mounted indicator lamp Download PDFInfo
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- CN212932907U CN212932907U CN202021458764.2U CN202021458764U CN212932907U CN 212932907 U CN212932907 U CN 212932907U CN 202021458764 U CN202021458764 U CN 202021458764U CN 212932907 U CN212932907 U CN 212932907U
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Abstract
The utility model discloses a fault detection circuit of on-vehicle pilot lamp, it is judged through the circuit voltage value to under control switch closure and the off-state whether on-vehicle pilot lamp breaks down, include: 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 utility model discloses convenient to use, with low costs, detect the accuracy, have high commercial value.
Description
Technical Field
The utility model belongs to the technical field of the car, specifically, relate to a fault detection circuit of on-vehicle pilot 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 is not provided, and specifically, a fault detection circuit of a vehicle-mounted indicator lamp is not provided.
SUMMERY OF THE UTILITY MODEL
Technical defect to prior art existence, the utility model aims at providing a fault detection circuit of on-vehicle pilot lamp, according to the utility model discloses an aspect provides a fault detection circuit of on-vehicle pilot lamp, and it is through the circuit voltage value judgement under to control switch closure and the off-state whether the on-vehicle pilot lamp breaks down, include:
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.
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.
The utility model discloses a carry out optimal design to on-vehicle pilot lamp diagnostic circuit, satisfy the dual requirement of performance and cost. The utility model 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 or 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 utility model discloses can realize the on-the-spot detection function of vehicle-mounted pilot lamp under the condition that increases few cost. The utility model discloses convenient to use, with low costs, detect the accuracy, have high 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 shows a truth table of fault detection of the first embodiment of the present invention.
Detailed Description
In order to better clearly show the technical solution of the present invention, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a circuit structure of a fault detection circuit of a vehicle-mounted indicating lamp according to an embodiment of the present invention, and it will be understood by those skilled in the art that the present invention can be applied not only to the technical field of fault detection of vehicle-mounted indicating lamps, but also to fault detection of other electronic devices, and the vehicle-mounted indicating lamps have great significance to driving safety and need to remind users and manufacturers when faults occur, so that manufacturers have higher requirements for fault diagnosis of the vehicle-mounted indicating lamps, and need component manufacturers to provide reliable and convenient diagnosis methods, and the fault detection circuit and method of the vehicle-mounted indicating lamps provided by the present invention are different from fault detection circuits without in-place detection, different from fault detection circuits using current sensors, and disclose a switching state using resistance current sensors in combination with control switches, and comparing with a truth table so as to realize accurate grasp of the faults of the vehicle-mounted indicator lamp.
Specifically, the utility model discloses a fault detection circuit of on-vehicle pilot lamp, it is through judging the circuit voltage value under control switch closure and the off-state whether the on-vehicle pilot lamp breaks down, the utility model discloses thereby need combine control switch to carry out integrated analysis at the truth value data under closure and the two kinds of states of disconnection and confirm whether the on-vehicle pilot lamp breaks down, further, confirm what kind of trouble has taken place, include:
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. Resistance current sensor 2, it can also be called as current sensing resistance, the utility model discloses a replace the current sensor in the traditional meaning with resistance current sensor 2, the cost is reduced has improved detection efficiency and precision, wherein, control switch 1 establishes ties with a resistance current sensor 2, on-vehicle pilot lamp 3 with detection resistance 4 is parallelly connected.
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 monitoring voltage value at this point, the detecting unit 5 is used to determine the monitoring voltage value between the first resistor R1 and the second resistor R2, and is essentially a cpu, and is used to convert an analog signal into an analog-to-digital converter of a digital signal.
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, the protection resistor is a resistor used for protecting high-voltage testing equipment and test products, and the protection resistor itself does not participate in the calculation of the truth table, 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 shows a truth table of fault detection according to a first embodiment of the present invention, and in conjunction with the specific implementation shown in fig. 1, fig. 2 is intended to further describe the fault detection circuit for fault determination of the vehicle-mounted indicator light by means of a control method, first, monitoring voltage values are respectively obtained when the control switch is in a closed state and in an open state, in such an embodiment, when the control switch is in a closed state, the detecting unit 5 obtains one monitoring voltage value, and when the control switch is in an open state, the detecting unit 5 obtains another monitoring voltage value. Then, based on the monitored voltage value, a corresponding threshold value is calculated, 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, judge whether on-vehicle pilot lamp breaks down based on the threshold value, in such embodiment, the utility model discloses it is right to combine fig. 2 on-vehicle pilot lamp whether breaks down judges, specifically, fig. 2 shows the utility model discloses a first embodiment, a fault detection's truth table, the technical personnel in the art understand, need reference control switch simultaneously under closed and break off two kinds of states the voltage value of detecting element judges can confirm on-vehicle pilot lamp whether breaks down.
As shown in fig. 2, 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. 2, 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. 2, 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. 2, 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 the specific embodiments of the 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 those skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (9)
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. The fault detection circuit according to claim 1, 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 fault detection circuit according to claim 2, wherein the detection unit (5) acquires the monitoring voltage values in the closed and open states of the control switch, respectively, and determines whether the on-vehicle indicator lamp (3) has a fault based on the monitoring voltage values.
6. The fault detection circuit according to claim 1, 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.
7. The fault detection circuit of claim 1, wherein the on-board indicator light is in a short-to-ground state when the control switch is 0V in a closed state and the control switch is 0V in an open state.
8. The fault detection circuit of claim 1, wherein the on-board indicator light is in a short circuit to power supply state when the control switch is at a value of B in the closed state and the control switch is at a value of B in the open state, wherein the value of 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.
9. The fault detection circuit of claim 1, wherein the on-board indicator light is in an open state when the control switch is at a value of B in the closed state and the control switch is at 0V in the open state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021458764.2U CN212932907U (en) | 2020-07-22 | 2020-07-22 | Fault detection circuit of vehicle-mounted indicator lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021458764.2U CN212932907U (en) | 2020-07-22 | 2020-07-22 | Fault detection circuit of vehicle-mounted indicator lamp |
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| Publication Number | Publication Date |
|---|---|
| CN212932907U true CN212932907U (en) | 2021-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021458764.2U Active CN212932907U (en) | 2020-07-22 | 2020-07-22 | Fault detection circuit of vehicle-mounted indicator lamp |
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| CN (1) | CN212932907U (en) |
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- 2020-07-22 CN CN202021458764.2U patent/CN212932907U/en active Active
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