CN113696836B - Fault diagnosis circuit and method for steering lamp - Google Patents
Fault diagnosis circuit and method for steering lamp Download PDFInfo
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- CN113696836B CN113696836B CN202110991593.2A CN202110991593A CN113696836B CN 113696836 B CN113696836 B CN 113696836B CN 202110991593 A CN202110991593 A CN 202110991593A CN 113696836 B CN113696836 B CN 113696836B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q11/00—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
- B60Q11/005—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00 for lighting devices, e.g. indicating if lamps are burning or not
- B60Q11/007—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00 for lighting devices, e.g. indicating if lamps are burning or not the lighting devices indicating change of drive direction
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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Abstract
The invention discloses a fault diagnosis circuit and method for a steering lamp, and belongs to the technical field of steering lamps. The fault diagnosis circuit of the steering lamp comprises a light-emitting diode fault diagnosis circuit, a halogen lamp fault diagnosis circuit and a vehicle body controller, wherein the light-emitting diode fault diagnosis circuit drives a light-emitting diode to generate a light-emitting diode driving voltage, a sampling voltage is generated according to a comparison result of the light-emitting diode driving voltage and a preset alarm voltage, the halogen lamp fault diagnosis circuit drives a halogen lamp to generate a halogen lamp driving voltage, the vehicle body controller generates a first diagnosis signal according to the sampling voltage, generates a second diagnosis signal according to the halogen lamp driving voltage, carries out fault alarm control according to the first diagnosis signal and the second diagnosis signal respectively, carries out fault diagnosis according to output voltages of the light-emitting diode and the halogen lamp respectively by adopting the vehicle body controller of the vehicle, realizes fault alarm according to a diagnosis structure, and reduces the fault diagnosis cost of the steering lamp.
Description
Technical Field
The invention relates to the technical field of steering lamps, in particular to a steering lamp fault diagnosis circuit and method.
Background
The turn signal lamp is an important indicator lamp which is turned on when the motor vehicle turns to prompt the attention of front, rear, left, right vehicles and pedestrians, and if the turn signal lamp fails, the turn signal lamp cannot play a role in warning, and traffic accidents are easily caused, so that the fault diagnosis of the turn signal lamp is particularly important. The turn signal lamps may be classified into a left front turn signal lamp, a left side turn signal lamp, a left rear turn signal lamp, a right front turn signal lamp, a right side turn signal lamp, and a right rear turn signal lamp, and may be configured as a halogen lamp or an LED lamp (light emitting diode). At present, the existing fault diagnosis of the steering lamp can judge whether a fault exists or not by adopting a relay and the cooperative control of a plurality of controllers, and the control logic is complex and the cost is higher.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a steering lamp fault diagnosis circuit and a steering lamp fault diagnosis method, and aims to solve the technical problem that the steering lamp fault diagnosis cost is high in the prior art.
In order to achieve the above object, the present invention provides a fault diagnosis circuit for a steering lamp, where the fault diagnosis circuit for a steering lamp includes a light emitting diode fault diagnosis circuit, a halogen lamp fault diagnosis circuit and a vehicle body controller, a driving end of the vehicle body controller is connected to a controlled end of the light emitting diode fault diagnosis circuit and a controlled end of the halogen lamp fault diagnosis circuit, a first voltage input end of the vehicle body controller is connected to a voltage output end of the light emitting diode fault diagnosis circuit, and a second voltage input end of the vehicle body controller is connected to a voltage output end of the halogen lamp fault diagnosis circuit;
the light-emitting diode fault diagnosis circuit is used for receiving the power supply voltage output by the vehicle body controller, driving a light-emitting diode according to the power supply voltage and generating a light-emitting diode driving voltage;
the light emitting diode fault diagnosis circuit is also used for comparing the light emitting diode driving voltage with a preset alarm voltage, generating a sampling voltage according to a comparison result and outputting the sampling voltage to the automobile body controller;
the halogen lamp fault diagnosis circuit is used for receiving the power supply voltage output by the vehicle body controller, driving a halogen lamp according to the power supply voltage, generating a halogen lamp driving voltage and outputting the halogen lamp driving voltage to the vehicle body controller;
the automobile body controller is used for generating a first diagnosis signal according to the sampling voltage, generating a second diagnosis signal according to the halogen lamp driving voltage, and performing fault alarm control according to the first diagnosis signal and the second diagnosis signal respectively.
Optionally, the led failure diagnosis circuit includes: the controlled end of the lamp bead driving circuit is connected with the driving end of the vehicle body controller, the voltage output end of the lamp bead driving circuit is connected with the voltage input end of the signal processing circuit, and the voltage output end of the signal processing circuit is connected with the voltage input end of the vehicle body controller;
the lamp bead driving circuit is used for receiving the power supply voltage output by the automobile body controller, driving the light emitting diode according to the power supply voltage and generating light emitting diode driving voltage;
the signal processing circuit is used for comparing the light emitting diode driving voltage with a preset alarm voltage, generating a sampling voltage according to a comparison result, and outputting the sampling voltage to the automobile body controller.
Optionally, the lamp bead driving circuit includes: the LED comprises a light emitting diode, a first triode, a second triode, a first resistor and a second resistor;
the anode of the light emitting diode is connected with the driving end of the vehicle body controller, the cathode of the light emitting diode is connected with the first end of the first resistor, the second end of the first resistor is connected with the collector of the first triode, the first end of the second resistor is connected with the driving end of the vehicle body controller, the second end of the second resistor is respectively connected with the base of the first triode and the collector of the second triode, the emitter of the first triode is connected with the base of the second triode, and the emitter of the second triode is grounded.
Optionally, the lamp bead driving circuit further includes a third resistor and a fourth resistor;
the first end of the third resistor is connected with the cathode of the light emitting diode, the second end of the third resistor is connected with the voltage input end of the signal processing circuit, the first end of the fourth resistor is connected with the emitting electrode of the first triode, and the second end of the fourth resistor is grounded.
Optionally, the signal processing circuit comprises: the interface unit, the comparator, the fifth resistor, the sixth resistor and the voltage stabilizing diode;
the voltage input end of the interface unit is connected with the voltage output end of the lamp bead driving circuit, the voltage output end of the interface unit is connected with the positive input end of the comparator, the first end of the fifth resistor is connected with the power supply, the second end of the fifth resistor is respectively connected with the negative input end of the comparator and the first end of the sixth resistor, the second end of the sixth resistor is grounded, the negative power supply end of the comparator is further connected with the anode of the voltage stabilizing diode, and the output end of the comparator is connected with the cathode of the voltage stabilizing diode.
Optionally, the signal processing circuit further comprises: a seventh resistor, an eighth resistor and a first capacitor;
the first end of the seventh resistor is connected with the driving end of the automobile body controller, the second end of the seventh resistor is respectively connected with the positive power supply end of the comparator and the voltage input end of the automobile body controller, the first end of the eighth resistor is connected with the output end of the comparator, the second end of the eighth resistor is connected with the voltage input end of the automobile body controller, the first end of the first capacitor is connected with the output end of the comparator, and the second end of the first capacitor is grounded.
Optionally, the vehicle body controller comprises: the high-voltage driving circuit comprises a high driving chip, a ninth resistor, a tenth resistor and a second capacitor;
the voltage output end of the light-emitting diode fault diagnosis circuit is connected with the first end of the ninth resistor, the second end of the ninth resistor is respectively connected with the voltage input end of the high-driving chip and the first end of the second capacitor, the second end of the second capacitor is grounded, the first end of the tenth resistor is connected with a power supply, and the second end of the tenth resistor is connected with the voltage input end of the high-driving chip.
In addition, in order to achieve the above object, the present invention also proposes a turn signal lamp fault diagnosis method applied to the turn signal lamp fault diagnosis circuit as described above, the turn signal lamp fault diagnosis circuit including a light emitting diode fault diagnosis circuit, a halogen lamp fault diagnosis circuit, and a vehicle body controller;
the fault diagnosis method for the turn signal lamp comprises the following steps:
the light-emitting diode fault diagnosis circuit receives the power supply voltage output by the vehicle body controller, drives a light-emitting diode according to the power supply voltage and generates light-emitting diode driving voltage;
the light-emitting diode fault diagnosis circuit compares the light-emitting diode driving voltage with a preset alarm voltage, generates a sampling voltage according to a comparison result, and outputs the sampling voltage to the automobile body controller;
the halogen lamp fault diagnosis circuit receives the power supply voltage output by the vehicle body controller, drives a halogen lamp according to the power supply voltage, generates a halogen lamp driving voltage and outputs the halogen lamp driving voltage to the vehicle body controller;
and the automobile body controller generates a first diagnosis signal according to the sampling voltage, generates a second diagnosis signal according to the halogen lamp driving voltage, and performs fault alarm control according to the first diagnosis signal and the second diagnosis signal respectively.
Optionally, the led fault diagnosis circuit compares the led driving voltage with a preset alarm voltage, generates a sampling voltage according to a comparison result, and outputs the sampling voltage to the vehicle body controller;
and the vehicle body controller executes a light-emitting diode fault diagnosis strategy according to the sampling voltage, generates a light-emitting diode diagnosis signal according to the light-emitting diode fault diagnosis strategy, and performs fault alarm control according to the light-emitting diode diagnosis signal.
Optionally, the halogen lamp fault diagnosis circuit receives a supply voltage output by the vehicle body controller, drives a halogen lamp according to the supply voltage, generates a halogen lamp driving voltage, and outputs the halogen lamp driving voltage to the vehicle body controller, and then further includes:
and the vehicle body controller executes a halogen lamp fault diagnosis strategy according to the halogen lamp driving voltage, generates a halogen lamp diagnosis signal according to the halogen lamp fault diagnosis strategy, and performs fault alarm control according to the halogen lamp diagnosis signal.
The fault diagnosis circuit of the steering lamp comprises a light-emitting diode fault diagnosis circuit, a halogen lamp fault diagnosis circuit and a vehicle body controller, wherein a driving end of the vehicle body controller is respectively connected with a controlled end of the light-emitting diode fault diagnosis circuit and a controlled end of the halogen lamp fault diagnosis circuit, a first voltage input end of the vehicle body controller is connected with a voltage output end of the light-emitting diode fault diagnosis circuit, and a second voltage input end of the vehicle body controller is connected with a voltage output end of the halogen lamp fault diagnosis circuit. The light emitting diode fault diagnosis circuit drives a light emitting diode according to a power supply voltage output by a vehicle body controller, generates a light emitting diode driving voltage, compares the light emitting diode driving voltage with a preset alarm voltage, generates a sampling voltage according to a comparison result, outputs the sampling voltage to the vehicle body controller, drives a halogen lamp according to the power supply voltage output by the vehicle body controller, generates a halogen lamp driving voltage, outputs the halogen lamp driving voltage to the vehicle body controller, generates a first diagnosis signal according to the sampling voltage, generates a second diagnosis signal according to the halogen lamp driving voltage, and performs fault alarm control according to the first diagnosis signal and the second diagnosis signal. By adopting the vehicle body controller of the vehicle, fault diagnosis is carried out according to the output voltages of the light-emitting diode and the halogen lamp respectively, fault alarm is realized according to a diagnosis structure, and the fault diagnosis cost of the steering lamp is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a fault diagnosis circuit for a turn signal lamp according to a first embodiment of the present invention;
FIG. 2 is a circuit diagram of a second embodiment of the turn signal fault diagnosis circuit of the present invention;
FIG. 3 is a schematic flow chart illustrating a fault diagnosis method for a turn signal lamp according to a first embodiment of the present invention;
fig. 4 is a flow chart of an embodiment of a fault diagnosis method for a turn signal lamp according to the present invention.
The reference numbers indicate:
| reference numerals | Name (R) | Reference numerals | Name(s) |
| 10 | Fault diagnosis circuit for light- |
101 | Lamp |
| 20 | Halogen lamp |
102 | |
| 30 | Vehicle body controller | R1～R10 | First to tenth resistors |
| U1 | High-driving chip | C1～C2 | First to second capacitors |
| L1 | Comparator with a comparator circuit | Q1～Q2 | First to second triodes |
| J1 | Interface unit | D1 | Light emitting diode |
| VB | Supply voltage input | D2 | Voltage stabilizing diode |
| VL | Steering lamp driving voltage input end |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a turn signal lamp fault diagnosis circuit according to the present invention.
The embodiment of the invention provides a fault diagnosis circuit for a steering lamp, which comprises a light-emitting diode fault diagnosis circuit 10, a halogen lamp fault diagnosis circuit 20 and a vehicle body controller 30, wherein a driving end of the vehicle body controller 30 is respectively connected with a controlled end of the light-emitting diode fault diagnosis circuit 10 and a controlled end of the halogen lamp fault diagnosis circuit 20, a first voltage input end of the vehicle body controller 30 is connected with a voltage output end of the light-emitting diode fault diagnosis circuit 10, and a second voltage input end of the vehicle body controller 30 is connected with a voltage output end of the halogen lamp fault diagnosis circuit 20.
It should be noted that the steering lamp fault diagnosis circuit can simultaneously consider the configuration of four steering lamp types (full halogen, front LED + rear halogen, front halogen + rear LED, full LED), when the LED fault diagnosis circuit 10 is two-way, it is the full LED configuration, when the halogen lamp fault diagnosis circuit 20 is two-way, it is the full halogen configuration, and when the LED fault diagnosis circuit 10 and the halogen lamp fault diagnosis circuit 20 are one-way, it is the configuration of front LED + rear halogen or front halogen + rear LED. The vehicle body controller 30 may determine whether the steering signal is a left steering signal or a right steering signal through the interface, and may further determine whether the steering signal is a front steering signal or a rear steering signal. The single-side steering lamp shares one driving port, so that the consumption of hardware driving resources is reduced.
The led fault diagnosis circuit 10 is configured to receive the power supply voltage output by the vehicle body controller 30, drive the led according to the power supply voltage, and generate an led driving voltage.
It is easy to understand that when there is at least one led failure diagnosis circuit 10, any led failure diagnosis circuit 10 drives the led according to the supply voltage to generate the led driving voltage. The turn signal lamp is electrified, and if a turn signal lamp bead (light emitting diode) is normally lightened to work, a low level signal can be correspondingly output according to the driving voltage of the light emitting diode; if the lamp bead (light-emitting diode) is damaged and is open-circuited, a high level signal can be correspondingly output according to the driving voltage of the light-emitting diode.
The led fault diagnosis circuit 10 is further configured to compare the led driving voltage with a preset alarm voltage, generate a sampling voltage according to a comparison result, and output the sampling voltage to the vehicle body controller 30.
It is understood that the led failure diagnosis circuit 10 compares the led driving voltage with a preset alarm voltage, and generates a sampling voltage according to the comparison result. In specific implementation, the led failure diagnosis circuit 10 may clamp the maximum potential of the generated sampling voltage to about 5.1V, and reasonably design the internal resistance value, so that when more than x (where n > x > 1) lamp beads are damaged, the led failure diagnosis circuit 10 may feedback output a low level (the value of the sampling voltage is less than 2.7V), and when less than x lamp beads are damaged, the led failure diagnosis circuit 10 may feedback output a sampling voltage of about 5V.
The halogen lamp fault diagnosis circuit 20 is configured to receive the power supply voltage output by the vehicle body controller 30, drive a halogen lamp according to the power supply voltage, generate a halogen lamp driving voltage, and output the halogen lamp driving voltage to the vehicle body controller 30.
It should be understood that when there is at least one halogen lamp failure diagnosis circuit 20, any one of the halogen lamp failure diagnosis circuits 20 drives the halogen lamp according to the supply voltage to generate a halogen lamp driving voltage, and the halogen lamp driving voltage may be directly output to the vehicle body controller 30 for subsequent diagnosis by the vehicle body controller 30.
The vehicle body controller 30 is configured to generate a first diagnostic signal according to the sampling voltage, generate a second diagnostic signal according to the halogen lamp driving voltage, and perform fault alarm control according to the first diagnostic signal and the second diagnostic signal, respectively.
It is easy to understand that, when the body controller 30 receives the sampling voltage and the halogen lamp driving voltage at the same time, the configuration of the front LED + the rear halogen or the front halogen + the rear LED is known. The vehicle body controller 30 respectively judges whether the sampling voltage and the halogen lamp driving voltage are within the corresponding normal ranges, and if the sampling voltage and the halogen lamp driving voltage are within the normal ranges, the fault alarm control is prohibited to be realized according to the first diagnosis signal and the second diagnosis signal; correspondingly, if the first diagnostic signal and the second diagnostic signal are not in the normal range, the fault alarm can be controlled according to the first diagnostic signal and the second diagnostic signal; if one of the sampling voltage and the halogen lamp driving voltage is not in the normal range, only the steering lamp corresponding to the voltage not in the normal range is controlled to give a fault alarm.
In the present embodiment, the steering lamp fault diagnosis circuit includes a light emitting diode fault diagnosis circuit 10, a halogen lamp fault diagnosis circuit 20 and a vehicle body controller 30, a driving end of the vehicle body controller 30 is respectively connected to a controlled end of the light emitting diode fault diagnosis circuit 10 and a controlled end of the halogen lamp fault diagnosis circuit 20, a first voltage input end of the vehicle body controller 30 is connected to a voltage output end of the light emitting diode fault diagnosis circuit 10, and a second voltage input end of the vehicle body controller 30 is connected to a voltage output end of the halogen lamp fault diagnosis circuit 20. The light emitting diode fault diagnosis circuit 10 drives the light emitting diode according to the power supply voltage output by the vehicle body controller 30, generates a light emitting diode driving voltage, compares the light emitting diode driving voltage with a preset alarm voltage, generates a sampling voltage according to the comparison result, outputs the sampling voltage to the vehicle body controller 30, the halogen lamp fault diagnosis circuit 20 drives the halogen lamp according to the power supply voltage output by the vehicle body controller 30, generates a halogen lamp driving voltage, outputs the halogen lamp driving voltage to the vehicle body controller 30, the vehicle body controller 30 generates a first diagnosis signal according to the sampling voltage, generates a second diagnosis signal according to the halogen lamp driving voltage, and performs fault alarm control according to the first diagnosis signal and the second diagnosis signal. By adopting the vehicle body controller 30 of the vehicle, fault diagnosis is carried out according to the output voltages of the light-emitting diode and the halogen lamp respectively, fault alarm is realized according to a diagnosis structure, and the fault diagnosis cost of the steering lamp is reduced.
Referring to fig. 2, fig. 2 is a circuit diagram of a turn signal lamp fault diagnosis circuit according to a second embodiment of the present invention.
Based on the first embodiment, in this embodiment, the led failure diagnosis circuit 10 includes: the controlled end of the lamp bead driving circuit 101 is connected with the driving end of the vehicle body controller 30, the voltage output end of the lamp bead driving circuit 101 is connected with the voltage input end of the signal processing circuit 102, and the voltage output end of the signal processing circuit 102 is connected with the voltage input end of the vehicle body controller 30.
It is easy to understand that the led turn signal may include several lamp beads, and accordingly, the led failure diagnosis circuit 10 may include the same number of lamp bead driving circuits 101 to obtain the led driving voltage generated by each lamp bead (led D1).
The lamp bead driving circuit 101 is configured to receive the power supply voltage output by the vehicle body controller 30, drive the light emitting diode D1 according to the power supply voltage, and generate a light emitting diode driving voltage.
It is easy to understand that, when there is at least one path of the lamp bead driving circuits 101, any one of the lamp bead driving circuits 101 drives the light emitting diode D1 according to the power supply voltage to generate the light emitting diode driving voltage. The turn signal lamp is electrified, and if a turn signal lamp bead (the light emitting diode D1) is normally lightened to work, a low level signal can be correspondingly output according to the driving voltage of the light emitting diode; if the lamp bead (the light-emitting diode D1) is damaged and the circuit is opened, a high level signal can be correspondingly output according to the driving voltage of the light-emitting diode.
The signal processing circuit 102 is configured to compare the led driving voltage with a preset alarm voltage, generate a sampling voltage according to a comparison result, and output the sampling voltage to the body controller 30.
It is understood that the signal processing circuit 102 compares the led driving voltage with a preset alarm voltage, and generates a sampling voltage according to the comparison result. In specific implementation, the signal processing circuit 102 can clamp the maximum potential of the generated sampling voltage to about 5.1V, and reasonably design the built-in resistance value, so that when more than x (where n > x > 1) lamp beads are damaged, the signal processing circuit 102 feeds back and outputs a low level (the value of the sampling voltage is less than 2.7V), and when less than x lamp beads are damaged, the signal processing circuit 102 feeds back and outputs the sampling voltage of about 5V.
The lamp bead driving circuit 101 includes: the LED comprises a light emitting diode D1, a first triode Q1, a second triode Q2, a first resistor R1 and a second resistor R2;
the positive pole of the light emitting diode D1 is connected with the driving end of the vehicle body controller 30, the negative pole of the light emitting diode D1 is connected with the first end of the first resistor R1, the second end of the first resistor R1 is connected with the collector electrode of the first triode Q1, the first end of the second resistor R2 is connected with the driving end of the vehicle body controller 30, the second end of the second resistor R2 is respectively connected with the base electrode of the first triode Q1 and the collector electrode of the second triode Q2, the emitter electrode of the first triode Q1 is connected with the base electrode of the second triode Q2, and the emitter electrodes of the second triodes are grounded.
It should be understood that VL is the steering lamp driving voltage input terminal, and the led D1 may be a bulb of the steering lamp. The emitting pole of first triode Q1 is connected with second triode Q2's base, second triode Q2 could correspond when first triode Q1 switches on and switches on, first resistance R1 and second resistance R2 are first triode Q1's load resistance, the voltage of the adjustable input first triode Q1 collecting electrode of resistance and base through setting up first resistance R1 and second resistance R2, further the voltage of the steerable input second triode Q2 collecting electrode and base, so that first triode Q1 and second triode Q2 switch on in proper order.
The lamp bead driving circuit 101 further comprises a third resistor R3 and a fourth resistor R4;
a first end of the third resistor R3 is connected to a cathode of the light emitting diode D1, a second end of the third resistor R3 is connected to a voltage input end of the signal processing circuit 102, a first end of the fourth resistor R4 is connected to an emitter of the first triode Q1, and a second end of the fourth resistor R4 is grounded.
It can be understood that the third resistor R3 and the fourth resistor R4 are voltage dividing resistors, and the third resistor R3 is used for dividing the output voltage of the lamp bead driving circuit 101.
The signal processing circuit 102 includes: the interface unit J1, the comparator L1, a fifth resistor R5, a sixth resistor R6 and a voltage stabilizing diode D2;
the voltage input end of the interface unit J1 is connected to the voltage output end of the lamp bead driving circuit 101, the voltage output end of the interface unit J1 is connected to the positive input end of the comparator L1, the first end of the fifth resistor R5 is connected to the power supply, the second end of the fifth resistor R5 is connected to the negative input end of the comparator L1 and the first end of the sixth resistor R6, the second end of the sixth resistor R6 is grounded, the negative power source end of the comparator L1 is further connected to the anode of the zener diode D2, and the output end of the comparator L1 is connected to the cathode of the zener diode D2.
It is easily understood that interface unit J1 can be used to be connected with a plurality of lamp pearl drive circuit 101, and a plurality of lamp pearl drive circuit 101 parallel connection inserts, and interface unit J1 receives lamp pearl drive circuit 101's output voltage respectively to export simultaneously to comparator L1, connect through interface unit J1, easily set up circuit layout. VB is the supply voltage input end, and fifth resistance R5 and sixth resistance R6 can be divider resistance, and comparator L1 can compare the potential point level of a plurality of lamp pearl drive circuit 101 output with the potential point level that fifth resistance R5 and sixth resistance R6 partial pressure formed.
The signal processing circuit 102 further comprises: a seventh resistor R7, an eighth resistor R8 and a first capacitor C1;
a first end of the seventh resistor R7 is connected to the driving end of the vehicle body controller 30, a second end of the seventh resistor R7 is connected to the positive power terminal of the comparator L1 and the voltage input terminal of the vehicle body controller 30, a first end of the eighth resistor R8 is connected to the output terminal of the comparator L1, a second end of the eighth resistor R8 is connected to the voltage input terminal of the vehicle body controller 30, a first end of the first capacitor C1 is connected to the output terminal of the comparator L1, and a second end of the first capacitor C1 is grounded.
It is understood that the seventh resistor R7 and the eighth resistor R8 are load resistors respectively serving as a supply voltage input terminal and a turn signal driving voltage input terminal, and the first capacitor C1 is a filter capacitor. The comparator L1 can clamp the maximum potential of the output voltage (sampling voltage) at about 5.1V, and through reasonably designing the built-in resistance value of the signal processing circuit 102, the signal processing circuit 102 can feed back and output low level (the value of the sampling voltage is less than 2.7V) when more than x (wherein n is more than x and is more than 1) lamp beads are damaged, and the signal processing circuit 102 feeds back and outputs the sampling voltage of about 5V when less than x lamp beads are damaged.
In this embodiment, the vehicle body controller 30 includes: the high-voltage driving circuit comprises a high driving chip U1, a ninth resistor R9, a tenth resistor R10 and a second capacitor C2;
a voltage output end of the light emitting diode fault diagnosis circuit 10 is connected with a first end of a ninth resistor R9, a second end of the ninth resistor R9 is connected with a voltage input end of the high driving chip U1 and a first end of a second capacitor C2, a second end of the second capacitor C2 is grounded, a first end of a tenth resistor R10 is connected with a power supply, and a second end of the tenth resistor R10 is connected with a voltage input end of the high driving chip U1.
It is easy to understand that the ninth resistor R9 and the tenth resistor R10 are load resistors, and the second capacitor C2 is a filter capacitor. And a halogen lamp fault diagnosis strategy, a light-emitting diode fault diagnosis strategy and a single-halogen single-light-emitting diode fault diagnosis strategy are set in the internal program of the high-driving chip U1. The high driving chip U1 can obtain a full-halogen open-circuit diagnosis threshold value according to a halogen lamp fault diagnosis strategy, compares the halogen lamp driving voltage with the full-halogen open-circuit diagnosis threshold value, and indicates that the full-halogen lamp has no fault if the halogen lamp driving voltage is in a normal interval. The high driving chip U1 can obtain a single halogen open circuit diagnosis threshold value according to a single halogen single light emitting diode fault diagnosis strategy, compares the halogen lamp driving voltage with the single halogen open circuit diagnosis threshold value, if the halogen lamp driving voltage is in a normal interval, the single halogen lamp is free of fault, the single light emitting diode D1 is continuously monitored for a feedback level (sampling voltage), and if the feedback level is greater than or equal to 2.7V, the light emitting diode D1 is free of fault. The high-speed driving chip U1 can continuously monitor the feedback level (sampling voltage) of the light-emitting diode D1 according to the light-emitting diode fault diagnosis strategy, and if the feedback level is greater than or equal to 2.7V, the light-emitting diode D1 has no fault.
In the embodiment, the light emitting diode fault diagnosis circuit 10 comprises a lamp bead driving circuit 101 and a signal processing circuit 102, the lamp bead driving circuit 101 comprises a light emitting diode D1, a first triode Q1, a second triode Q2, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, the signal processing circuit 102 comprises an interface unit J1, a comparator L1, a fifth resistor R5, a sixth resistor R6, a voltage stabilizing diode D2, a seventh resistor R7, an eighth resistor R8 and a first capacitor C1, the vehicle body controller 30 comprises a high driving chip U1, a ninth resistor R9, a tenth resistor R10 and a second capacitor C2, the range of the output sampling voltage value is limited by the lamp bead driving circuit 101 and the signal processing circuit 102, the sampling software method of the vehicle body controller 30 is a self-adaptive identification strategy, the fault diagnosis circuit 10 and the halogen lamp fault diagnosis circuit 20 are adapted to realize intelligent judgment, the situation that fault diagnosis and configuration are needed when a vehicle production line is produced or after-sale maintenance and replacement is needed is avoided, and the fault diagnosis cost is reduced.
An embodiment of the present invention provides a fault diagnosis method for a turn signal, and referring to fig. 3, fig. 3 is a schematic flow diagram of a first embodiment of the fault diagnosis method for a turn signal according to the present invention. The steering lamp fault diagnosis method is applied to the steering lamp fault diagnosis circuit which comprises a light-emitting diode fault diagnosis circuit, a halogen lamp fault diagnosis circuit and a vehicle body controller.
In this embodiment, the method for diagnosing a fault of a turn signal includes the following steps:
step S10: the light emitting diode fault diagnosis circuit receives the power supply voltage output by the vehicle body controller, drives the light emitting diode according to the power supply voltage and generates light emitting diode driving voltage.
It is easy to understand that when at least one LED fault diagnosis circuit is present, any LED fault diagnosis circuit drives the LED according to the supply voltage to generate the LED driving voltage. The turn signal lamp is electrified, and if a lamp bead (light emitting diode) of the turn signal lamp is normally lightened for working, a low level signal can be correspondingly output according to the driving voltage of the light emitting diode; if the lamp bead (light-emitting diode) is damaged and is open-circuited, a high level signal can be correspondingly output according to the driving voltage of the light-emitting diode.
Step S20: the LED fault diagnosis circuit compares the LED driving voltage with a preset alarm voltage, generates a sampling voltage according to a comparison result, and outputs the sampling voltage to the automobile body controller.
It can be understood that the led failure diagnosis circuit compares the led driving voltage with a preset alarm voltage, and generates a sampling voltage according to the comparison result. In the specific implementation, the maximum potential of the generated sampling voltage can be clamped at about 5.1V by the light-emitting diode fault diagnosis circuit, the built-in resistance value is reasonably designed, and the light-emitting diode fault diagnosis circuit can realize that when more than x (wherein n is more than x and is more than 1) lamp beads are damaged, the light-emitting diode fault diagnosis circuit feeds back and outputs a low level (the value of the sampling voltage is less than 2.7V), and when less than x lamp beads are damaged, the light-emitting diode fault diagnosis circuit feeds back and outputs the sampling voltage of about 5V.
Step S30: the halogen lamp fault diagnosis circuit receives the power supply voltage output by the vehicle body controller, drives the halogen lamp according to the power supply voltage, generates a halogen lamp driving voltage, and outputs the halogen lamp driving voltage to the vehicle body controller.
It should be understood that, when at least one halogen lamp fault diagnosis circuit exists, any one of the halogen lamp fault diagnosis circuits drives the halogen lamp according to the power supply voltage to generate a halogen lamp driving voltage, and the halogen lamp driving voltage can be directly output to the vehicle body controller for subsequent diagnosis by the vehicle body controller.
Step S40: and the automobile body controller generates a first diagnosis signal according to the sampling voltage, generates a second diagnosis signal according to the halogen lamp driving voltage, and performs fault alarm control according to the first diagnosis signal and the second diagnosis signal respectively.
It is easy to understand that, when the vehicle body controller receives the sampling voltage and the halogen lamp driving voltage at the same time, the current configuration is known as front LED + rear halogen or front halogen + rear LED configuration. The vehicle body controller respectively judges whether the sampling voltage and the halogen lamp driving voltage are in corresponding normal ranges, and if the sampling voltage and the halogen lamp driving voltage are in the normal ranges, the vehicle body controller can forbid realizing of fault alarm control according to the first diagnosis signal and the second diagnosis signal; correspondingly, if the first diagnostic signal and the second diagnostic signal are not in the normal range, the fault alarm can be controlled according to the first diagnostic signal and the second diagnostic signal; and if one of the sampling voltage and the halogen lamp driving voltage is not in the normal range, only controlling the steering lamp corresponding to the voltage which is not in the normal range by fault alarm.
In a specific implementation, as shown in fig. 4, fig. 4 is a block flow diagram of an embodiment of a fault diagnosis method for a turn signal lamp according to the present invention. If the value of the sampling voltage and the value of the halogen lamp driving voltage are both smaller than 2.7V, the first diagnosis signal and the second diagnosis signal are both alarm signals to carry out fault alarm; if the value of the sampling voltage is greater than 2.7V and less than 7V, and the value of the halogen lamp driving voltage is greater than 7V, the vehicle body controller can obtain a single-halogen open-circuit diagnosis threshold value according to a single-halogen single-light-emitting-diode fault diagnosis strategy, the halogen lamp driving voltage is compared with the single-halogen open-circuit diagnosis threshold value, when the halogen lamp driving voltage is in a normal interval, the single-halogen lamp is free of fault, otherwise, the single-light-emitting diode is in continuous monitoring of a feedback level (sampling voltage), when the feedback level is greater than or equal to 2.7V, the single-halogen lamp is free of fault, and otherwise, the single-light-emitting diode is in fault. The vehicle body controller can control the fault indicator lamp to flash for frequency multiplication when a fault exists, and the fault indicator lamp normally flashes when no fault exists.
Further, after the step S20, the method further includes: and the vehicle body controller executes a light-emitting diode fault diagnosis strategy according to the sampling voltage, generates a light-emitting diode diagnosis signal according to the light-emitting diode fault diagnosis strategy, and performs fault alarm control according to the light-emitting diode diagnosis signal.
It can be understood that, referring to fig. 4, when the vehicle body controller receives only the sampling voltage (the output voltage values of the front steering lamp or the rear steering lamp corresponding to the sampling voltage are both greater than 2.7V and less than 7V), it is known that the LED configuration is full, and at this time, the feedback level (sampling voltage) of the LED may be continuously monitored according to the LED fault diagnosis policy, and when the feedback level is greater than or equal to 2.7V, the LED diagnosis signal indicates that the full LED Lamp (LED) is fault-free. On the contrary, when the sampling voltage is less than 2.7V, the LED diagnosis signal represents the fault of the full LED lamp, and the fault alarm control can be further carried out according to the LED diagnosis signal
Further, after the step S30, the method further includes: and the vehicle body controller executes a halogen lamp fault diagnosis strategy according to the halogen lamp driving voltage, generates a halogen lamp diagnosis signal according to the halogen lamp fault diagnosis strategy, and performs fault alarm control according to the halogen lamp diagnosis signal.
It is easy to understand that, referring to fig. 4, when the vehicle body controller receives only the halogen lamp driving voltage (the output voltage values of the front turn signal or the rear turn signal corresponding to the halogen lamp driving voltage are both greater than 7V), it is known as a full halogen configuration, and at this time, the full halogen open-circuit diagnosis threshold value may be obtained according to the halogen lamp fault diagnosis policy, and the halogen lamp driving voltage is compared with the full halogen open-circuit diagnosis threshold value, and when the halogen lamp driving voltage is in the normal interval, the halogen lamp diagnosis signal indicates that the full halogen lamp is fault-free. On the contrary, when the halogen lamp driving voltage is not in the normal interval, the halogen lamp diagnosis signal represents the fault of the full halogen lamp, and the fault alarm control can be further carried out according to the halogen lamp diagnosis signal.
In this embodiment, the steering lamp fault diagnosis circuit includes a light emitting diode fault diagnosis circuit, a halogen lamp fault diagnosis circuit and a vehicle body controller, a driving end of the vehicle body controller is connected to a controlled end of the light emitting diode fault diagnosis circuit and a controlled end of the halogen lamp fault diagnosis circuit, a first voltage input end of the vehicle body controller is connected to a voltage output end of the light emitting diode fault diagnosis circuit, and a second voltage input end of the vehicle body controller is connected to a voltage output end of the halogen lamp fault diagnosis circuit. The light emitting diode fault diagnosis circuit drives a light emitting diode according to a power supply voltage output by a vehicle body controller, generates a light emitting diode driving voltage, compares the light emitting diode driving voltage with a preset alarm voltage, generates a sampling voltage according to a comparison result, outputs the sampling voltage to the vehicle body controller, drives a halogen lamp according to the power supply voltage output by the vehicle body controller, generates a halogen lamp driving voltage, outputs the halogen lamp driving voltage to the vehicle body controller, generates a first diagnosis signal according to the sampling voltage, generates a second diagnosis signal according to the halogen lamp driving voltage, and performs fault alarm control according to the first diagnosis signal and the second diagnosis signal. By adopting the vehicle body controller of the vehicle, fault diagnosis is carried out according to the output voltages of the light-emitting diode and the halogen lamp respectively, fault alarm is realized according to a diagnosis structure, and the fault diagnosis cost of the steering lamp is reduced.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.
It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.
In addition, the technical details that are not described in detail in this embodiment can be referred to the fault diagnosis circuit and method for the turn signal lamp provided by any embodiment of the present invention, and are not described herein again.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g. Read Only Memory (ROM)/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g. a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A fault diagnosis circuit of a steering lamp is characterized in that the fault diagnosis circuit of the steering lamp comprises a light-emitting diode fault diagnosis circuit, a halogen lamp fault diagnosis circuit and a vehicle body controller, wherein a driving end of the vehicle body controller is respectively connected with a controlled end of the light-emitting diode fault diagnosis circuit and a controlled end of the halogen lamp fault diagnosis circuit, a first voltage input end of the vehicle body controller is connected with a voltage output end of the light-emitting diode fault diagnosis circuit, and a second voltage input end of the vehicle body controller is connected with a voltage output end of the halogen lamp fault diagnosis circuit;
the light emitting diode fault diagnosis circuit is used for receiving the power supply voltage output by the vehicle body controller, driving a light emitting diode according to the power supply voltage and generating light emitting diode driving voltage;
the light-emitting diode fault diagnosis circuit is also used for comparing the light-emitting diode driving voltage with a preset alarm voltage, generating a sampling voltage according to a comparison result and outputting the sampling voltage to the automobile body controller;
the halogen lamp fault diagnosis circuit is used for receiving the power supply voltage output by the vehicle body controller, driving a halogen lamp according to the power supply voltage, generating a halogen lamp driving voltage and outputting the halogen lamp driving voltage to the vehicle body controller;
the automobile body controller is used for generating a first diagnosis signal according to the sampling voltage, generating a second diagnosis signal according to the halogen lamp driving voltage, and performing fault alarm control according to the first diagnosis signal and the second diagnosis signal respectively;
the vehicle body controller includes: the high-voltage driving circuit comprises a high driving chip, a ninth resistor, a tenth resistor and a second capacitor;
the voltage output end of the light-emitting diode fault diagnosis circuit is connected with the first end of the ninth resistor, the second end of the ninth resistor is connected with the voltage input end of the high-driving chip and the first end of the second capacitor respectively, the second end of the second capacitor is grounded, the first end of the tenth resistor is connected with a power supply, and the second end of the tenth resistor is connected with the voltage input end of the high-driving chip.
2. The turn signal lamp fault diagnostic circuit of claim 1, wherein the light emitting diode fault diagnostic circuit comprises: the controlled end of the lamp bead driving circuit is connected with the driving end of the vehicle body controller, the voltage output end of the lamp bead driving circuit is connected with the voltage input end of the signal processing circuit, and the voltage output end of the signal processing circuit is connected with the voltage input end of the vehicle body controller;
the lamp bead driving circuit is used for receiving the power supply voltage output by the automobile body controller, driving the light emitting diode according to the power supply voltage and generating light emitting diode driving voltage;
the signal processing circuit is used for comparing the light emitting diode driving voltage with a preset alarm voltage, generating a sampling voltage according to a comparison result, and outputting the sampling voltage to the automobile body controller.
3. The turn signal lamp fault diagnosis circuit of claim 2, wherein the lamp bead driving circuit comprises: the LED comprises a light emitting diode, a first triode, a second triode, a first resistor and a second resistor;
the positive pole of the light-emitting diode is connected with the driving end of the automobile body controller, the negative pole of the light-emitting diode is connected with the first end of the first resistor, the second end of the first resistor is connected with the collector electrode of the first triode, the first end of the second resistor is connected with the driving end of the automobile body controller, the second end of the second resistor is respectively connected with the base electrode of the first triode and the collector electrode of the second triode, the emitter electrode of the first triode is connected with the base electrode of the second triode, and the emitter electrodes of the second triode are grounded.
4. The turn signal lamp fault diagnosis circuit of claim 3, wherein the lamp bead driving circuit further comprises a third resistor and a fourth resistor;
the first end of the third resistor is connected with the cathode of the light emitting diode, the second end of the third resistor is connected with the voltage input end of the signal processing circuit, the first end of the fourth resistor is connected with the emitting electrode of the first triode, and the second end of the fourth resistor is grounded.
5. The turn signal lamp fault diagnosis circuit according to claim 2, wherein the signal processing circuit includes: the interface unit, the comparator, the fifth resistor, the sixth resistor and the voltage stabilizing diode;
the voltage input end of the interface unit is connected with the voltage output end of the lamp bead driving circuit, the voltage output end of the interface unit is connected with the positive input end of the comparator, the first end of the fifth resistor is connected with the power supply, the second end of the fifth resistor is respectively connected with the negative input end of the comparator and the first end of the sixth resistor, the second end of the sixth resistor is grounded, the negative power supply end of the comparator is further connected with the anode of the voltage stabilizing diode, and the output end of the comparator is connected with the cathode of the voltage stabilizing diode.
6. The turn signal lamp fault diagnostic circuit of claim 5, wherein the signal processing circuit further comprises: a seventh resistor, an eighth resistor and a first capacitor;
the first end of the seventh resistor is connected with the driving end of the automobile body controller, the second end of the seventh resistor is respectively connected with the positive power supply end of the comparator and the voltage input end of the automobile body controller, the first end of the eighth resistor is connected with the output end of the comparator, the second end of the eighth resistor is connected with the voltage input end of the automobile body controller, the first end of the first capacitor is connected with the output end of the comparator, and the second end of the first capacitor is grounded.
7. A turn signal lamp failure diagnosis method applied to a turn signal lamp failure diagnosis circuit according to any one of claims 1 to 6, the turn signal lamp failure diagnosis circuit including a light emitting diode failure diagnosis circuit, a halogen lamp failure diagnosis circuit, and a vehicle body controller;
the fault diagnosis method for the turn signal lamp comprises the following steps:
the light-emitting diode fault diagnosis circuit receives the power supply voltage output by the vehicle body controller, drives a light-emitting diode according to the power supply voltage and generates light-emitting diode driving voltage;
the light-emitting diode fault diagnosis circuit compares the light-emitting diode driving voltage with a preset alarm voltage, generates a sampling voltage according to a comparison result, and outputs the sampling voltage to the automobile body controller;
the halogen lamp fault diagnosis circuit receives the power supply voltage output by the vehicle body controller, drives a halogen lamp according to the power supply voltage, generates a halogen lamp driving voltage and outputs the halogen lamp driving voltage to the vehicle body controller;
and the automobile body controller generates a first diagnosis signal according to the sampling voltage, generates a second diagnosis signal according to the halogen lamp driving voltage, and performs fault alarm control according to the first diagnosis signal and the second diagnosis signal respectively.
8. The fault diagnosis method for the turn signal lamp according to claim 7, wherein the fault diagnosis circuit for the light emitting diode compares the driving voltage for the light emitting diode with a preset alarm voltage, generates a sampling voltage according to the comparison result, and outputs the sampling voltage to the vehicle body controller;
and the vehicle body controller executes a light-emitting diode fault diagnosis strategy according to the sampling voltage, generates a light-emitting diode diagnosis signal according to the light-emitting diode fault diagnosis strategy, and performs fault alarm control according to the light-emitting diode diagnosis signal.
9. The turn signal lamp failure diagnosis method according to claim 7, wherein the halogen lamp failure diagnosis circuit receives a supply voltage output from the vehicle body controller, drives a halogen lamp according to the supply voltage, generates a halogen lamp driving voltage, and outputs the halogen lamp driving voltage to the vehicle body controller, and further comprises:
and the automobile body controller executes a halogen lamp fault diagnosis strategy according to the halogen lamp driving voltage, generates a halogen lamp diagnosis signal according to the halogen lamp fault diagnosis strategy, and performs fault alarm control according to the halogen lamp diagnosis signal.
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| CN104742799B (en) * | 2015-03-31 | 2017-01-11 | 奇瑞汽车股份有限公司 | LED steering lamp control circuit and control method thereof |
| CN207565465U (en) * | 2017-10-27 | 2018-07-03 | 常州星宇车灯股份有限公司 | A kind of fault diagnosis reponse system of automobile LED car light |
| CN108749709B (en) * | 2018-05-23 | 2020-11-27 | 浙江吉利汽车研究院有限公司 | Steering lamp control system and method capable of being matched with different light sources |
| CN110901520B (en) * | 2019-11-01 | 2021-09-17 | 北京汽车股份有限公司 | Steering lamp control system and method thereof |
| CN112537321A (en) * | 2020-12-29 | 2021-03-23 | 联晶智能电子有限公司 | Automobile steering lamp testing device |
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| CN108569212A (en) * | 2017-10-27 | 2018-09-25 | 常州星宇车灯股份有限公司 | A kind of fault diagnosis reponse system of automobile LED car light |
| CN111619446A (en) * | 2020-05-22 | 2020-09-04 | 重庆大茂伟瑞柯车灯有限公司 | Car light fault error reporting system |
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