CN113296017A - Vehicle lamp fault detection system, electric vehicle and vehicle lamp fault detection method - Google Patents
Vehicle lamp fault detection system, electric vehicle and vehicle lamp fault detection method Download PDFInfo
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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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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses a vehicle lamp fault detection system, an electric vehicle and a vehicle lamp fault detection method. The vehicle lamp fault detection system comprises M signal isolation modules, a state signal processing module and a main control unit, wherein the signal isolation modules correspond to the LED modules one to one; the Nth LED module is connected with the state signal processing module through the Nth signal isolation module; the state signal processing module is used for processing the voltage signal output by the LED module and outputting a detection voltage signal according to the voltage signal; the voltage signal output by the LED module comprises a cathode voltage signal of the vehicle lamp; the main control unit is used for sending a control enabling signal to the LED module and judging the fault type of the LED module according to the detection voltage signal. The technical scheme provided by the embodiment of the invention realizes the time-sharing detection of the plurality of groups of LED modules, saves the signal input channel resource of the main control unit, reduces the hardware cost and overcomes the detection blind spot problem.
Description
Technical Field
The embodiment of the invention relates to an electronic detection technology, in particular to a vehicle lamp fault detection system, an electric vehicle and a vehicle lamp fault detection method.
Background
With the rapid development of electric bicycles, the application of electrification of electric bicycles is becoming more and more widespread. For example, electric vehicles such as electric motorcycles, electric bicycles, and electric scooters are equipped with front and rear lamps or other illumination lamps to improve driving safety. The automobile lamp fault detection prompts the automobile lamp fault of a consumer to be paid attention to by an entire automobile manufacturer gradually.
The existing fault detection technical scheme mostly uses a sampling resistor to sample high-end or low-end current, and then uses an operational amplifier to amplify the signal, and provides the signal for a main control chip to read and analyze. The detection method has high hardware cost and complex application circuit, and the direct receiving of the detection signal by the detection device easily causes the problem that the detection device is damaged due to signal overload. And the short-circuit fault of the car lamp cannot be detected in the application of constant current driving, and the problem of blind detection exists.
Disclosure of Invention
The invention provides a vehicle lamp fault detection system, an electric vehicle and a vehicle lamp fault detection method, which are used for solving the defects in the prior art, realizing time-sharing detection of a plurality of groups of LED modules, saving the signal input channel resource of a main control unit, reducing the hardware cost and overcoming the detection blind spot problem.
In a first aspect, a vehicle lamp fault detection system provided in an embodiment of the present invention includes M signal isolation modules, a status signal processing module, and a main control unit, where the signal isolation modules correspond to LED modules one to one;
the Nth LED module is connected with the state signal processing module through the Nth signal isolation module; wherein N is greater than or equal to 1 and less than or equal to M, and M and N are positive integers; the signal isolation module is used for isolating the voltage signal output by the LED module; the state signal processing module is used for processing the voltage signal and outputting a detection voltage signal according to the voltage signal; wherein the voltage signal comprises a negative polarity voltage signal of the vehicle lamp;
the input end of the main control unit is connected with the state signal processing module; the output end of the main control unit is connected with the control end of the LED module; the main control unit is used for sending a control enabling signal to the LED module through the output end and judging the fault type of the LED module according to the detection voltage signal.
Optionally, the state signal processing module includes a voltage dividing circuit, a voltage stabilizing diode and a filter circuit;
the input end of the voltage division circuit is connected with the output end of the signal isolation module, and the voltage division circuit is used for dividing the voltage signal and outputting a divided voltage signal from the output end of the voltage division circuit;
the cathode of the voltage stabilizing diode is connected with the output end of the voltage dividing circuit, and the anode of the voltage stabilizing diode is grounded; the voltage stabilizing diode is used for stabilizing the voltage dividing signal, and if the voltage dividing signal is smaller than the voltage stabilizing voltage of the voltage stabilizing diode, the voltage dividing signal is output; if the voltage division signal is larger than the regulated voltage of the voltage-stabilizing diode, outputting the regulated voltage;
the filter circuit is connected with the voltage stabilizing diode in parallel; the main control unit is connected with the output end of the voltage division circuit.
Optionally, the voltage dividing circuit includes a first voltage dividing resistor and a second voltage dividing resistor;
the first end of the first divider resistor is connected with the LED module, and the second end of the first divider resistor is connected with the cathode of the voltage stabilizing diode; the second voltage-dividing resistor is connected with the voltage-stabilizing diode in parallel.
Optionally, the filter circuit includes a capacitor, and the capacitor is connected in parallel with the zener diode.
In a second aspect, an electric vehicle provided in an embodiment of the present invention includes the vehicle lamp fault detection system according to any one of the embodiments of the present invention.
Optionally, the electric vehicle includes an LED module, where the LED module includes an LED lamp, a driving circuit, a current-limiting resistor, and an electronic switch module; the cathode of the LED car lamp is connected with the first end of the current-limiting resistor, and the second end of the current-limiting resistor is connected with the driving circuit; the control end of the driving circuit and the control end of the electronic switch module are both connected with the output end of the main control unit; and the main control unit sends a control enabling signal to the drive circuit and the electronic switch module through the output end.
Optionally, the electronic switch module includes a first PNP-type triode, a first NPN-type triode, a first protection resistor, a first current-limiting resistor, a second current-limiting resistor, and a second protection resistor;
the output end of the main control unit is connected with the first end of the second current-limiting resistor; the second end of the second current limiting resistor and the first end of the second protection resistor are both connected with the base electrode of the first NPN type triode; the second end of the second protective resistor and the emitter of the first NPN type triode are grounded; the first end of the first current limiting resistor is connected with the collector electrode of the first NPN type triode; the second end of the first current limiting resistor and the first end of the first protection resistor are both connected with the base electrode of the first PNP type triode; the second end of the first protection resistor and the cathode of the LED car lamp are both connected with the emitter of the first PNP type triode; and the collector electrode of the first PNP type triode is connected with the signal isolation module.
In a third aspect, the method for detecting a vehicle lamp fault according to the embodiments of the present invention may be executed by a vehicle lamp fault detection system, where the vehicle lamp fault detection system includes a state signal processing module and a main control unit;
the method comprises the following steps:
the state signal processing module processes the voltage signal output by the LED module and outputs a detection voltage signal according to the voltage signal; wherein the voltage signal comprises a negative polarity voltage signal of the vehicle lamp;
and the main control unit judges the fault type of the LED module according to the detection voltage signal.
Optionally, the state signal processing module includes a voltage dividing circuit, a voltage stabilizing diode and a filter circuit;
the state signal processing module processes the voltage signal output by the LED module, and outputs a detection voltage signal according to the voltage signal comprises:
after the voltage signal output by the LED module is divided by the voltage dividing circuit, if the divided voltage is greater than the regulated voltage of the voltage stabilizing diode, the detection voltage signal output by the state signal processing module is a regulated voltage signal; if the divided voltage is smaller than the regulated voltage of the voltage stabilizing diode, the detection voltage signal output by the state signal processing module is a divided voltage signal; and if the divided voltage is equal to zero, the detection voltage signal output by the state signal processing module is zero.
Optionally, the determining, by the main control unit, the fault type of the LED module according to the detection voltage signal includes:
if the main control unit receives that the detection voltage signal is a voltage stabilization voltage signal, the LED module is in short circuit fault; if the detection voltage signal received by the main control unit is a divided voltage signal, the LED module is normal and has no fault; and if the detection voltage signal received by the main control unit is zero, the LED module is in an open-circuit fault.
According to the technical scheme provided by the embodiment of the invention, the voltage signal output by the LED module is processed by the state signal processing module to obtain the detection voltage signal less than or equal to the stable voltage, so that the damage of the main control unit caused by large voltage and large current generated when the vehicle lamp breaks down can be effectively avoided. Meanwhile, the main control unit can judge the working state of the LED module according to the size of the received detection voltage signal. The state signal processing module is connected with the plurality of groups of LED modules through the corresponding signal isolation modules and then is connected with the main control unit through the output of the state signal processing module, so that the time-sharing detection of the plurality of groups of LED modules is realized, the signal input channel resource of the main control unit is saved, and the hardware cost is reduced. And the short-circuit fault of the LED car lamp in the constant current driving application can be reflected through the cathode voltage signal of the car lamp, so that the problem of detection blind spots is solved.
Drawings
Fig. 1 is a schematic diagram of a fault detection circuit employing high-side or low-side current sampling.
Fig. 2 is a schematic structural diagram of a vehicle lamp fault detection system according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a status signal processing module according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of another status signal processing module according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a circuit for detecting a failure of an electric vehicle lamp according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a further electric vehicle lamp fault detection circuit according to an embodiment of the present invention.
Fig. 7 is a schematic flow chart of a vehicle lamp fault detection method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
Fig. 1 is a schematic diagram of a fault detection circuit employing high-side or low-side current sampling. Referring to fig. 1, in the prior art, a sampling resistor RSENSE is mostly used to sample high-side or low-side current, and then an operational amplifier is used to amplify the signal, which is provided to a main control chip for reading and analyzing. High-precision sampling resistors are required by adopting a high-end or low-end current sampling scheme, and peripheral devices of the operational amplifier also need higher precision requirements. And each sampling unit needs one operational amplifier and one ADC sampling channel, so the cost of the whole scheme is high.
In view of this, an embodiment of the present invention provides a car light fault detection system, and fig. 2 is a schematic structural diagram of the car light fault detection system according to the embodiment of the present invention. Referring to fig. 2, the car light fault detection system includes M signal isolation modules 260, a state signal processing module 220 and a main control unit 230, wherein the signal isolation modules 260 correspond to the LED modules one to one;
the nth LED module is connected to the status signal processing module 220 through the nth signal isolation module 260; wherein N is greater than or equal to 1 and less than or equal to M, and M and N are positive integers; the signal isolation module 260 is used for isolating the voltage signal output by the LED module; the state signal processing module 220 is configured to process the voltage signal and output a detection voltage signal according to the voltage signal; wherein the voltage signal comprises a negative voltage signal of the vehicle lamp;
the input end of the main control unit 230 is connected with the state signal processing module 220; the output end of the main control unit 230 is connected with the control end of the LED module; the main control unit 230 is configured to send a control enable signal to the LED module through the output terminal, and determine a fault type of the LED module according to the detection voltage signal.
Specifically, the signal isolation module 260 may unidirectionally isolate the voltage signals output by the LED modules, so as to avoid mutual influence of the voltage signals, and enable unidirectional transmission of the voltage signals output by the LED modules. Illustratively, the signal isolation module 260 may be a diode. The output ends of the first LED module 210, the second LED module 240, and up to the nth LED module 250 are respectively connected to the status signal processing module 220 through corresponding diodes, where it should be noted that the nth LED module corresponds to the LED module N in the drawing, for example, the first LED module corresponds to the LED module 1 in the drawing. The output end of the main control unit 230 is connected to the control end of each LED module, and the main control unit 230 can send a control enable signal to one LED module, so as to control the LED module to be turned on or turned off.
Illustratively, the working principle of the vehicle lamp fault detection system is as follows: the main control unit 230 sends a control enable signal to turn on the LED module to be detected, and the state signal processing module 220 receives a voltage signal output by the turned-on LED module, where the output voltage signal may include a cathode voltage signal of the vehicle lamp. After the state signal processing module 220 processes the voltage signal, a detection voltage signal less than or equal to the stable voltage can be obtained, so that the maximum detection voltage signal that the main control unit 230 can receive is the stable voltage, and the damage of the main control unit caused by the generation of large voltage and large current when the vehicle lamp fails can be effectively avoided. The main control unit 230 can determine the working state of the LED module according to the magnitude of the received detection voltage signal, wherein the working state includes normal, short-circuit or open-circuit of the LED module. And when the LED car lamp has a short-circuit fault in constant-current driving application, the working state of the LED module can still be reflected through a voltage signal of a negative electrode of the car lamp.
According to the technical scheme provided by the embodiment of the invention, the voltage signal output by the LED module is processed by the state signal processing module to obtain the detection voltage signal less than or equal to the stable voltage, so that the damage of the main control unit caused by large voltage and large current generated when the vehicle lamp breaks down can be effectively avoided. Meanwhile, the main control unit can judge the working state of the LED module according to the size of the received detection voltage signal. The state signal processing module is connected with the plurality of groups of LED modules through the corresponding signal isolation modules and then is connected with the main control unit through the output of the state signal processing module, so that the time-sharing detection of the plurality of groups of LED modules is realized, the signal input channel resource of the main control unit is saved, the hardware cost is reduced, and the problem of detection blind spots is solved.
Fig. 3 is a schematic structural diagram of a status signal processing module according to an embodiment of the present invention. Referring to fig. 3, the status signal processing module 220 includes a voltage dividing circuit, a zener diode 130, and a filter circuit 140;
the input end of the voltage division circuit is connected with the output end of the signal isolation module, and the voltage division circuit is used for dividing the voltage signal output by the LED module and outputting the divided voltage signal from the output end of the voltage division circuit;
the cathode of the voltage stabilizing diode 130 is connected with the output end of the voltage dividing circuit, and the anode of the voltage stabilizing diode 130 is grounded; the voltage stabilizing diode 130 is used for stabilizing a voltage and dividing a voltage signal, and if the voltage dividing signal is smaller than the voltage stabilizing voltage of the voltage stabilizing diode 130, the voltage dividing signal is output; and outputting the regulated voltage if the divided voltage signal is greater than the regulated voltage of the regulator diode 130.
The filter circuit 140 is connected in parallel with the zener diode 130; the main control unit 230 is connected to an output terminal of the voltage dividing circuit 120.
Specifically, the voltage divider circuit includes a first voltage divider circuit 120 and a second voltage divider circuit 160, wherein an input end of the first voltage divider circuit 120 is an input end of the voltage divider circuit, and an output end of the second voltage divider circuit 160 is an output end of the voltage divider circuit. The input terminal of the first voltage divider circuit 120 is connected to the output terminal of the signal isolation module, and the output terminal of the second voltage divider circuit 160 is connected to the main control unit. After voltage signals output by the LED modules pass through the signal isolation module, the voltage signals are divided by the first voltage dividing circuit 120 and the second voltage dividing circuit 160 and stabilized by the zener diode 130, and then are filtered by the filter circuit 140 to be provided to the signal input channel of the main control unit 230, wherein the signal input channel may be an ADC sampling unit of the main control unit 230, and the voltage stabilizing voltage of the zener diode 130 may be selected according to the actual situation. After sampling by the ADC sampling unit, the main control unit 230 reads and analyzes the sampling voltage VADC of the ADC sampling unit. For example, the working principle of the state signal processing module 220 is that if the LED module has an open-circuit fault, the voltage of the cathode of the car light is zero, and the voltage signal output by the LED module is zero, at this time, the ADC sampling unit of the main control unit is directly grounded through the second voltage division circuit 160, so that the sampled voltage VADC voltage signal at the open-circuit time is zero. If the LED module is short-circuited, the cathode voltage of the car lamp is the power voltage, the voltage signal output by the LED module is the power voltage minus the loss voltage drop of the devices on the circuit, and at this time, the voltage divided by the first voltage dividing circuit 120 and the second voltage dividing circuit 160 is greater than the regulated voltage of the zener diode 130, so that the sampling voltage VADC of the ADC sampling unit of the main control unit 230 is the regulated voltage of the zener diode 130 when the LED module is short-circuited. The open circuit or short circuit state of the vehicle lamp can be judged according to the magnitude of the sampled voltage VADC.
Fig. 4 is a schematic structural diagram of another status signal processing module according to an embodiment of the present invention. Referring to fig. 4, the voltage dividing circuit includes a first voltage dividing resistor R11 and a second voltage dividing resistor R12.
The first end of the first divider resistor R11 is connected with the LED module, and the second end of the first divider resistor R11 is connected with the cathode of the Zener diode Z1. The second voltage divider resistor R12 is connected in parallel with the zener diode Z1.
Specifically, the voltage signal output by the LED module is divided by the first voltage dividing resistor R11 and the second voltage dividing resistor R12, if the vehicle lamp of the LED module is working normally, the divided voltage is smaller than the regulated voltage of the zener diode Z1, and the sampling voltage VADC of the ADC sampling unit 410 of the main control unit is the divided voltage; if the car lamp of the LED module has an open-circuit fault, the voltage signal output by the LED module is zero, the first voltage dividing resistor R11 has no voltage input, and the ADC sampling unit 410 of the main control unit is directly grounded through the second voltage dividing resistor R12, so that the sampling voltage VADC voltage signal is zero when the car lamp is open-circuit; if the vehicle lamp of the LED module has a short-circuit fault, the divided voltage is greater than the regulated voltage of the zener diode Z1, and the sampled voltage VADC of the ADC sampling unit 410 of the main control unit is the regulated voltage of the zener diode Z1. The main control unit samples the voltage VADC signal through the ADC sampling unit 410, and reads and analyzes the voltage VADC signal to obtain the fault type of the LED module car light. After voltage division by the voltage division circuit and voltage stabilization by the voltage stabilizing diode, the maximum sampling voltage VADC of the main control unit is the voltage stabilizing voltage of the voltage stabilizing diode, and the problem that the main control unit is damaged due to overlarge voltage or current caused by open circuit or short circuit of the car lamp can be effectively solved.
With continued reference to fig. 4, optionally, the filter circuit includes a capacitor C1, the capacitor C1 being connected in parallel with the zener diode Z1. Specifically, electromagnetic interference can be filtered through the capacitor C1, so that the deformation of the acquired signal voltage wave is stable, and the signal filtering and anti-interference effects are achieved.
The electric vehicle provided by the embodiment of the invention comprises the vehicle lamp fault detection system provided by any one of the embodiments of the invention. Specifically, the electric vehicle includes an electric motor driven vehicle using a battery as a primary power or a secondary power, such as an electric motorcycle, an electric bicycle, or a power-assisted electric vehicle. The vehicle lamp fault detection system provided by any embodiment of the invention has the same beneficial effects, and is not repeated herein.
Optionally, the electric vehicle includes an LED module, and the LED module includes an LED vehicle lamp, a driving circuit, a current limiting resistor, and an electronic switch module; the cathode of the LED car lamp is connected with the first end of the current-limiting resistor, and the second end of the current-limiting resistor is connected with the driving circuit; the control end of the driving circuit and the control end of the electronic switch module are both connected with the output end of the main control unit; the main control unit sends control enabling signals to the driving circuit and the electronic switch module through the output end.
Specifically, fig. 5 is a schematic structural diagram of a circuit for detecting a failure of a lamp of an electric vehicle according to an embodiment of the present invention. Referring to fig. 5, taking an example that the electric vehicle includes 2 LED modules, a first LED module 510 and a second LED module 520, respectively. The first LED module 510 includes a first LED vehicle lamp 530, a first current limiting resistor R1, a first LED driver 550, and a first electronic switch module 540. The second LED module 520 includes a second LED lamp 560, a second current limiting resistor R2, a second LED driver 580, and a second electronic switch module 570.
The cathode of the first LED lamp 530 is connected to the first end of the first current limiting resistor R1, and the second end of the first current limiting resistor R1 is connected to the first LED driver 550. The first LED driver 550 is grounded at one end. The other end of the first LED driver 550 is connected to the first control enable signal output terminal LED1_ EN of the main control unit 230. The cathode of the first LED car lamp 530 is connected to the input terminal of the first electronic switch module 540, the control terminal of the first electronic switch module 540 is connected to the first control enable signal output terminal LED1_ EN of the main control unit 230, and the output terminal of the first electronic switch module 540 is connected to the corresponding signal isolation module 260. The cathode of the second LED lamp 560 is connected to the first end of the second current limiting resistor R2, and the second end of the second current limiting resistor R2 is connected to the second LED driver 580. The second LED driver 580 has one end connected to ground. The other end of the second LED driver 580 is connected to a second control enable signal output terminal LED2_ EN of the main control unit 230. The cathode of the second LED car lamp 560 is connected to the input end of the second electronic switch module 570, the control end of the second electronic switch module 570 is connected to the second control enable signal output end LED2_ EN of the main control unit 230, and the output end of the second electronic switch module 570 is connected to the corresponding signal isolation module 260.
The driving type of the LED car lamp can adopt constant current driving or constant voltage driving. The first control enable signal output by the main control unit 230 can simultaneously drive the first LED car lamp 530 to turn on and the first electronic switch module 540 to turn on. So that the first LED module 510 can output a voltage signal. Similarly, the second control enable signal output by the main control unit 230 can drive the second LED vehicle lamp 560 to turn on and the second electronic switch module 570 to turn on simultaneously. So that the second LED module 520 can output a voltage signal. According to the technical scheme provided by the embodiment of the invention, the constant current driving of the vehicle lamp or the constant voltage driving of the vehicle lamp can be realized by utilizing the corresponding LED driving, and by combining the vehicle lamp fault detection system provided by the embodiment of the invention, the problem that the short-circuit fault of the vehicle lamp cannot be detected by adopting a current sampling method when the LED vehicle lamp is driven by the constant current in the prior art can be avoided, and the open-circuit or short-circuit fault detection of the vehicle lamp is realized and the main control unit is protected.
Optionally, the electronic switch module includes a first PNP-type triode, a first NPN-type triode, a first protection resistor, a first current-limiting resistor, a second current-limiting resistor, and a second protection resistor;
the output end of the main control unit is connected with the first end of the second current-limiting resistor; the second end of the second current limiting resistor and the first end of the second protection resistor are both connected with the base electrode of the first NPN type triode; the second end of the second protective resistor and the emitter of the first NPN type triode are grounded; the first end of the first current limiting resistor is connected with the collector electrode of the first NPN type triode; the second end of the first current limiting resistor and the first end of the first protection resistor are both connected with the base electrode of the first PNP type triode; the second end of the first protection resistor and the cathode of the LED car lamp are both connected with the emitter of the first PNP type triode; the collector of the first PNP type triode is connected with the signal isolation module.
Specifically, fig. 6 is a schematic structural diagram of a further electric vehicle lamp fault detection circuit according to an embodiment of the present invention. Referring to fig. 6 in conjunction with fig. 5, taking an example that the electric vehicle includes 2 LED modules, a first LED module 510 and a second LED module 520, respectively. The first electronic switch module comprises a first PNP type triode Q1, a first NPN type triode Q2, a first protection resistor R3, a first current limiting resistor R4, a second current limiting resistor R5 and a second protection resistor R6. The second electronic switch module comprises a second PNP transistor Q3, a second NPN transistor Q4, a third protection resistor R7, a third current limiting resistor R8, a fourth current limiting resistor R9 and a fourth protection resistor R10.
The first control enable signal output end LED1_ EN of the main control unit is connected with the first end of the second current limiting resistor R5. The second end of the second current limiting resistor R5 and the first end of the second protection resistor R6 are both connected with the base of the first NPN type triode Q2. The second end of the second protective resistor R6 and the emitter of the first NPN transistor Q2 are both grounded. The first end of the first current limiting resistor R4 is connected to the collector of the first NPN transistor Q2. The second end of the first current limiting resistor R4 and the first end of the first protection resistor R3 are both connected with the base of the first PNP type triode Q1. The second end of the first protection resistor R3 and the negative electrode of the first LED lamp 530 are connected to the emitter of a first PNP transistor Q1. The collector of the first PNP transistor Q1 is connected to a corresponding signal isolation module, which may be a first diode D1. The first electronic switch module is switched on or switched off according to a first control enabling signal of the main control unit.
The first protection resistor R3, the first current limiting resistor R4, the second current limiting resistor R5 and the second protection resistor R6 play a role in current limiting protection of the first PNP triode Q1 and the first NPN triode Q2. When the first control enable signal sent by the main control unit is at a high level, the first NPN triode Q2 is driven to be turned on, and the first LED driver 550 starts to drive the vehicle lamp to work, so that the turn-on voltage of the first NPN triode Q2 is approximately zero. At this time, the base of the first PNP triode Q1 is at a low level, when the first LED vehicle lamp works normally, the cathode voltage of the first LED vehicle lamp can drive the first PNP triode Q1 to be turned on, and the turn-on voltage VEC of the first PNP triode Q1 is approximately zero. The first PNP transistor Q1 and the first NPN transistor Q2 act as a lossless electronic switch. The first NPN transistor Q2 is turned off when the first control enable signal sent by the main control unit is low, and the first PNP transistor Q1 cannot be turned on at this time. Whether the detection car light breaks down or not is finished simultaneously when the car light starts to work, and the detection efficiency and the detection real-time performance are improved.
The second control enable signal output end LED2_ EN of the main control unit is connected to the first end of the fourth current limiting resistor R9. The second end of the fourth current limiting resistor R9 and the first end of the fourth protection resistor R10 are both connected with the base of the second NPN type triode Q4. The second end of the fourth protection resistor R10 and the emitter of the second NPN transistor Q4 are both grounded. The first end of the third current limiting resistor R8 is connected to the collector of the second NPN transistor Q4. The second end of the third current limiting resistor R8 and the first end of the third protection resistor R7 are both connected with the base of a second PNP type triode Q3. The second end of the third protection resistor R7 is connected with the cathode of the second LED vehicle lamp. The second end of the third protective resistor R7 and the negative electrode of the second LED vehicle lamp are both connected with the emitter of a second PNP type triode Q3. The collector of the second PNP transistor Q3 is connected to a corresponding signal isolation module, which may be a second diode D2. The second electronic switch module is switched on or switched off according to a second control enabling signal sent by the main control unit.
The third protection resistor R7, the third current limiting resistor R8, the fourth current limiting resistor R9 and the fourth protection resistor R10 play a role in current limiting protection of the second PNP triode Q3 and the second NPN triode Q4. When the second control enable signal sent by the main control unit is at a high level, the second NPN triode Q4 is driven to be turned on, and the second LED driver 580 starts to drive the vehicle lamp to operate, so that the turn-on voltage of the second NPN triode Q4 is approximately zero. At this time, the base of the second PNP triode Q3 is at a low level, when the second LED vehicle lamp works normally, the cathode voltage of the second LED vehicle lamp can drive the second PNP triode Q3 to be turned on, and the turn-on voltage VEC of the second PNP triode Q3 is also approximately zero. The second PNP transistor Q3 and the second NPN transistor Q4 act as a lossless electronic switch. The second NPN transistor Q4 is turned off when the second control enable signal sent by the main control unit is low, and the second PNP transistor Q3 cannot be turned on at this time. Whether the detection car light breaks down or not is finished simultaneously when the car light starts to work, and the detection efficiency and the detection real-time performance are improved.
Illustratively, the electric vehicle lamp fault detection circuit theory of operation does: if the supply voltage VIN + of the system is 12V, the rated voltage of the first LED lamp 530 and the second LED lamp 560 is 9V. The conduction voltage drops of the first diode D1 and the second diode D2 are both marked as VD and are the same voltage drop, the voltage division coefficient of the first voltage division resistor R11 and the second voltage division resistor R12 is 0.5, the voltage stabilization voltage VZ of the voltage stabilization diode Z1 is 3.3V, and the driving mode of the LED vehicle lamp adopts constant current driving. When the first LED vehicle lamp 530 normally operates, the cathode voltage of the first LED vehicle lamp is 12-9 to 3V, the on-state voltage of the first PNP triode Q1 is negligible, the voltage after passing through the first diode D1 is (3-VD) V, the sampling voltage VADC after voltage division by the first voltage dividing resistor R11 and the second voltage dividing resistor R12 is (3-VD) × 0.5, and the sampling voltage VADC at this time is smaller than the regulated voltage VZ, so that the sampling voltage VADC of the ADC sampling unit 410 of the main control unit is smaller than the regulated voltage VZ when the first LED vehicle lamp 530 is normal. If the first LED lamp 530 is open-circuited, the voltage of the cathode of the first LED lamp 530 is zero, the first PNP transistor Q1 cannot be turned on, the first diode D1 is in a cut-off state, and the ADC sampling unit 410 of the main control unit is directly grounded through the second voltage-dividing resistor R12, so that the sampling voltage VADC when the first LED lamp 530 is open-circuited is zero. If the first LED lamp 530 is short-circuited, the voltage of the cathode of the first LED lamp 530 is 12V, the on-state voltage of the first PNP triode Q1 is negligible, the voltage after passing through the first diode D1 is (12-VD) V, the voltage after passing through the first voltage dividing resistor R11 and the second voltage dividing resistor R12 is (12-VD) × 0.5 > regulated voltage VZ, and the sampled voltage is regulated by the regulated diode Z1 by 3.3V. Therefore, the sampled voltage VADC of the ADC sampling unit 410 of the main control unit when the first LED car lamp 530 is short-circuited is 3.3V equal to the regulated voltage of the zener diode Z1. The fault type of the first LED lamp 530 can be determined by sampling the voltage VADC in each operating state of the first LED lamp 530. The failure detection operation principle of the second LED lamp 560 is the same as that described above, and will not be described herein again. According to the technical scheme provided by the embodiment of the invention, the fault detection function of the LED car lamp can be realized only by using a common device, and a high-cost and high-precision sampling device is not required. Thereby effectively reducing the hardware cost. The application scenario of multi-lamp fault detection can be extended according to the detection requirement.
Fig. 7 is a schematic flow chart of a vehicle lamp fault detection method according to an embodiment of the present invention. Referring to fig. 7, the car light fault detection method may be performed by a car light fault detection system including a state signal processing module and a main control unit;
the vehicle lamp fault detection method comprises the following steps:
s110, the state signal processing module processes the voltage signal output by the LED module and outputs a detection voltage signal according to the voltage signal; wherein the voltage signal comprises a negative polarity voltage signal of the vehicle lamp.
After the voltage signal is processed by the state signal processing module, the output detection voltage signal is less than or equal to the preset stabilized voltage of the state signal processing module.
Optionally, the state signal processing module includes a voltage dividing circuit, a voltage stabilizing diode and a filter circuit;
the state signal processing module processes the voltage signal output by the LED module, and outputs a detection voltage signal according to the voltage signal, comprising:
after the voltage signal output by the LED module is divided by the voltage dividing circuit, if the divided voltage is greater than the regulated voltage of the voltage stabilizing diode, the detection voltage signal output by the state signal processing module is a regulated voltage signal; if the divided voltage is less than the stabilized voltage of the voltage stabilizing diode, the detection voltage signal output by the state signal processing module is a divided voltage signal; and if the divided voltage is equal to zero, the detection voltage signal output by the state signal processing module is zero.
Specifically, after voltage signals output by the LED module pass through the signal isolation module, the voltage signals are subjected to voltage division by the voltage division circuit and are stabilized by the voltage stabilizing diode, then the voltage signals are subjected to signal filtering by the filter circuit and are provided for a signal input channel of the main control unit to be sampled by the ADC sampling unit, and the main control unit reads and analyzes sampling voltage VADC of the ADC sampling unit. The voltage stabilizing voltage of the voltage stabilizing diode can be selected according to the actual situation, the voltage signal output by the LED module is divided by the voltage dividing circuit, the divided voltage is smaller than the voltage stabilizing voltage of the voltage stabilizing diode, and the detection voltage signal output by the state signal processing module is the divided voltage; when the divided voltage is zero, the detection voltage signal output by the state signal processing module is zero; the divided voltage is larger than the stabilized voltage of the voltage stabilizing diode, and the detection voltage signal output by the state signal processing module is the stabilized voltage.
And S120, the main control unit judges the fault type of the LED module according to the detection voltage signal.
The main control unit judges whether the LED module is in a normal state, an open circuit state or a short circuit state according to the output magnitude of the detection voltage signal.
Optionally, the determining the fault type of the LED module according to the detection voltage signal includes:
if the detection voltage signal received by the main control unit is a voltage stabilization voltage signal, the LED module has a short-circuit fault; if the detection voltage signal received by the main control unit is a divided voltage signal, the LED module is normal and has no fault; and if the detection voltage signal received by the main control unit is zero, the LED module is in open-circuit fault.
Specifically, if the LED module has an open-circuit fault, the voltage of the cathode of the car light is zero, the voltage signal output by the LED module is zero, and at this time, the ADC sampling unit of the main control unit is directly grounded through the voltage dividing circuit, so that the voltage signal of the sampling voltage VADC is zero when the LED module is open-circuit. If the LED module is in short circuit, the cathode voltage of the car lamp is the power supply voltage, the voltage signal output by the LED module is the power supply voltage minus loss voltage drop, and the voltage divided by the voltage dividing circuit is greater than the regulated voltage of the voltage stabilizing diode, so that the sampling voltage VADC of the ADC sampling unit of the main control unit is the regulated voltage of the voltage stabilizing diode when the LED module is in short circuit. Therefore, the fault type of the LED module can be judged according to the sampling voltage VADC of the ADC sampling unit of the main control unit.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A car light fault detection system is characterized by comprising M signal isolation modules, a state signal processing module and a main control unit, wherein the signal isolation modules correspond to LED modules one by one;
the Nth LED module is connected with the state signal processing module through the Nth signal isolation module; wherein N is greater than or equal to 1 and less than or equal to M, and M and N are positive integers; the signal isolation module is used for isolating the voltage signal output by the LED module; the state signal processing module is used for processing the voltage signal and outputting a detection voltage signal according to the voltage signal; wherein the voltage signal comprises a negative polarity voltage signal of the vehicle lamp;
the input end of the main control unit is connected with the state signal processing module; the output end of the main control unit is connected with the control end of the LED module; the main control unit is used for sending a control enabling signal to the LED module through the output end and judging the fault type of the LED module according to the detection voltage signal.
2. The vehicle light fault detection system according to claim 1,
the state signal processing module comprises a voltage division circuit, a voltage stabilizing diode and a filter circuit;
the input end of the voltage division circuit is connected with the output end of the signal isolation module, and the voltage division circuit is used for dividing the voltage signal and outputting a divided voltage signal from the output end of the voltage division circuit;
the cathode of the voltage stabilizing diode is connected with the output end of the voltage dividing circuit, and the anode of the voltage stabilizing diode is grounded; the voltage stabilizing diode is used for stabilizing the voltage dividing signal, and if the voltage dividing signal is smaller than the voltage stabilizing voltage of the voltage stabilizing diode, the voltage dividing signal is output; if the voltage division signal is larger than the regulated voltage of the voltage-stabilizing diode, outputting the regulated voltage;
the filter circuit is connected with the voltage stabilizing diode in parallel; the main control unit is connected with the output end of the voltage division circuit.
3. The vehicle light fault detection system according to claim 2,
the voltage division circuit comprises a first voltage division resistor and a second voltage division resistor;
the first end of the first divider resistor is connected with the LED module, and the second end of the first divider resistor is connected with the cathode of the voltage stabilizing diode; the second voltage-dividing resistor is connected with the voltage-stabilizing diode in parallel.
4. The vehicle light fault detection system according to claim 2,
the filter circuit comprises a capacitor, and the capacitor is connected with the voltage stabilizing diode in parallel.
5. An electric vehicle comprising the lamp failure detection system according to any one of claims 1 to 4.
6. The electric vehicle of claim 5, characterized by comprising an LED module comprising an LED lamp, a driving circuit, a current limiting resistor and an electronic switch module; the cathode of the LED car lamp is connected with the first end of the current-limiting resistor, and the second end of the current-limiting resistor is connected with the driving circuit; the control end of the driving circuit and the control end of the electronic switch module are both connected with the output end of the main control unit; and the main control unit sends a control enabling signal to the drive circuit and the electronic switch module through the output end.
7. The electric vehicle of claim 6, wherein the electronic switching module comprises a first PNP transistor, a first NPN transistor, a first protection resistor, a first current limiting resistor, a second current limiting resistor, and a second protection resistor;
the output end of the main control unit is connected with the first end of the second current-limiting resistor; the second end of the second current limiting resistor and the first end of the second protection resistor are both connected with the base electrode of the first NPN type triode; the second end of the second protective resistor and the emitter of the first NPN type triode are grounded; the first end of the first current limiting resistor is connected with the collector electrode of the first NPN type triode; the second end of the first current limiting resistor and the first end of the first protection resistor are both connected with the base electrode of the first PNP type triode; the second end of the first protection resistor and the cathode of the LED car lamp are both connected with the emitter of the first PNP type triode; and the collector electrode of the first PNP type triode is connected with the signal isolation module.
8. A car light fault detection method is executed by a car light fault detection system, and is characterized in that the car light fault detection system comprises a state signal processing module and a main control unit;
the method comprises the following steps:
the state signal processing module processes the voltage signal output by the LED module and outputs a detection voltage signal according to the voltage signal; wherein the voltage signal comprises a negative polarity voltage signal of the vehicle lamp;
and the main control unit judges the fault type of the LED module according to the detection voltage signal.
9. The vehicle lamp fault detection method according to claim 8, wherein the status signal processing module comprises a voltage division circuit, a voltage regulator diode and a filter circuit;
the state signal processing module processes the voltage signal output by the LED module, and outputs a detection voltage signal according to the voltage signal comprises:
after the voltage signal output by the LED module is divided by the voltage dividing circuit, if the divided voltage is greater than the regulated voltage of the voltage stabilizing diode, the detection voltage signal output by the state signal processing module is a regulated voltage signal; if the divided voltage is smaller than the regulated voltage of the voltage stabilizing diode, the detection voltage signal output by the state signal processing module is a divided voltage signal; and if the divided voltage is equal to zero, the detection voltage signal output by the state signal processing module is zero.
10. The vehicle lamp fault detection method according to claim 9, wherein the determining, by the main control unit, the fault type of the LED module according to the detection voltage signal includes:
if the main control unit receives that the detection voltage signal is a voltage stabilization voltage signal, the LED module is in short circuit fault; if the detection voltage signal received by the main control unit is a divided voltage signal, the LED module is normal and has no fault; and if the detection voltage signal received by the main control unit is zero, the LED module is in an open-circuit fault.
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