A device and method for detecting periodic irregular current change of vehicle lights

Abstract

The present invention provides a device for detecting periodic irregular current changes of vehicle lamps and a detection method thereof, comprising a power module, a main controller, a square wave output module, a current acquisition module, a display, an alarm module, and a vehicle lamp; the power module is connected to the main controller, the square wave output module, the current acquisition module, the display, and the alarm module to provide a stable power supply voltage for each module; the main controller is connected to the square wave output module, the current acquisition module, the display, and the alarm module; the main controller controls the square wave output module to output a square wave with a period and a duty cycle; the current acquisition module collects the vehicle lamp current in real time, and converts it into a level signal and outputs it to the main controller; the main controller outputs the current waveform to the display, and the main controller outputs the judgment result to the alarm module. The present invention can detect periodic irregular current changes, and can display the current waveform in real time, with fast response speed, strong real-time performance, and high detection accuracy.

Description

Technical Field

[0001] The present invention belongs to the technical field of automatic detection, and in particular relates to a device for detecting periodic irregular current changes of vehicle lamps and a detection method thereof. Background Art

[0002] With the rapid development of the automotive electronics industry, car lights are also constantly upgraded with the development of modern technology. The core of car lights has changed from the past light bulbs to today's LEDs, and the way car lights are lit has also changed accordingly. People's aesthetics and requirements for car lights are getting higher and higher. Car lights have changed from a single flash to a variety of dynamic effects, and from independent functions to multi-functional composite lighting methods. As a result, the detection of car lights has become more and more important.

[0003] In the past, the current detection of car lights could only test the current value after the car lights were lit and stabilized. However, current car lights require a dynamic, multi-functional composite lighting method, and the existing detection method cannot test the lighting process of the car lights.

[0004] 1. Technical issues to be resolved

[0005] The object of the present invention is to provide a device and method for detecting periodic irregular current changes in vehicle lamps, which can collect vehicle lamp current in real time and display the current size, duration and determination result on a display.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A device for detecting periodic irregular current changes in vehicle lights, comprising a power module, a main controller, a square wave output module, a current acquisition module, a display, an alarm module, and a vehicle light; the power module is connected to the main controller, the square wave output module, the current acquisition module, the display, and the alarm module to provide a stable power supply voltage for each module; the main controller is connected to the square wave output module, the current acquisition module, the display, and the alarm module; the main controller controls the square wave output module to output a square wave with a period and a duty cycle to provide an input voltage for the vehicle light; the current acquisition module collects the periodic irregular current value of the vehicle light in real time, and converts it into a level signal and outputs it to the main controller; the main controller outputs the current waveform to the display, and the main controller outputs the judgment result to the alarm module.

[0009] According to one embodiment of the present invention, the power supply module includes an input terminal H2, a diode D1, a voltage regulator T1, capacitors C1, C2, C3, C4, and a three-terminal voltage regulator U1, the input terminal H2 is connected to the input power supply, the pin 1 of the input terminal H2 is connected to the anode of the diode D1 and the cathode of the voltage regulator T1, the pin 2 of the input terminal H2 and the anode of the voltage regulator T1 are grounded; the cathode of the diode D1 is connected to one end of the capacitor C1, one end of the capacitor C2, and pin 1 of the three-terminal voltage regulator U1, the other end of the capacitor C1, the other end of the capacitor C2, and pin 2 of the three-terminal voltage regulator U1 are grounded, the pin 3 of the three-terminal voltage regulator U1 is connected to one end of the capacitor C3 and one end of the capacitor C4 and outputs a +5V power supply, and the other end of the capacitor C3 and the other end of the capacitor C4 are grounded.

[0010] According to an embodiment of the present invention, the diode D1 is an ISMB28CAT3 anti-reverse connection diode; and the three-terminal voltage regulator U1 is an LM2940S low voltage drop three-terminal voltage regulator chip.

[0011] According to an embodiment of the present invention, the square wave output module includes resistors R9, R10, R11, R12, R13, R14, MOS tube Q3, transistor Q4, photoelectric coupler U6, +5V power supply, +12V power supply, one end of resistor R9 is connected to the control signal T-SIN, the other end of resistor R9 is connected to one end of resistor R10 and the base of transistor Q4, the other end of resistor R10 and the emitter of transistor Q4 are grounded; the collector of transistor Q4 is connected to pin 2 of photoelectric coupler U6, Pin 1 of the photocoupler U6 is connected to one end of the resistor R11, and the other end of the resistor R11 is connected to a +5V power supply. Pin 3 of the photocoupler U6 is connected to one end of the resistor R12, and the other end of the resistor R12 is grounded. Pin 4 of the photocoupler U6 is connected to one end of the resistor R13 and the gate of the MOS tube Q3; the other end of the resistor R13 is connected to the source of the MOS tube Q3 and the +12V power supply. The drain of the MOS tube Q3 is connected to one end of the resistor R14 and outputs a PWM signal. The other end of the resistor R14 is grounded.

[0012] According to an embodiment of the present invention, the photocoupler U6 is a PS2561 photocoupler; the transistor Q4 is an NPN transistor, which is 9013; and the MOS transistor Q3 is a P-MOS.

[0013] A method for detecting periodic irregular current changes of a vehicle lamp comprises the following steps:

[0014] S1. The main controller controls the square wave output module to generate a 2-cycle square wave, and collects the lamp current through the current acquisition module, so that the lamp has a complete cycle of current waveform;

[0015] S2, the main controller converts all the level signals collected by the current acquisition module, converts the level signals into actual current values, and sends the current waveform to the display for display;

[0016] S3, the main controller screens and determines the current value, first determines the starting position of the current waveform according to the minimum value, and then confirms the size and duration of each current segment according to the set value;

[0017] S4. The main controller determines the magnitude and duration of each current value. The current magnitude, duration and determination results are sent to the display for display. If all are qualified, an OK signal is output. If only one item is unqualified, an NG signal is output to the alarm module.

[0018] S5. The alarm module uses light and sound to alarm at the same time. When an OK signal is received, the green light is on. When an NG signal is received, the red light is on and there is a sound alarm prompt.

[0019] (III) Beneficial effects

[0020] The beneficial effects of the present invention are as follows: a device and method for detecting periodic irregular current changes in vehicle lamps, which collects current for data analysis, determines the magnitude and duration of each group of current, and can accurately calculate whether the vehicle lamp current waveform meets the requirements; collects all current data within two cycles for analysis, and if the vehicle lamp current waveform has a delay relative to the rising edge of the voltage, the delay time can be calculated based on the length of the last section of the current waveform; the vehicle lamp current can be collected in real time, and the current magnitude, duration and determination result can be displayed on a display. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a principle block diagram of the detection device of the present invention;

[0023] Figure 2 It is the circuit schematic diagram of the power module;

[0024] Figure 3 This is the circuit schematic diagram of the square wave output module;

[0025] Figure 4 It is a flow chart of the detection method of the present invention.

[0026] Description of reference numerals:

[0027] 1. Power module; 2. Main controller; 3. Square wave output module; 4. Current acquisition module; 5. Display; 6. Alarm module; 7. Car lights. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Combination Figure 1 A device for detecting periodic irregular current changes of vehicle lights comprises a power module 1, a main controller 2, a square wave output module 3, a current acquisition module 4, a display 5, an alarm module 6, and a vehicle light 7. The power module 1 is connected to the main controller 2, the square wave output module 3, the current acquisition module 4, the display 5, and the alarm module 6 to provide a stable power supply voltage for each module; the main controller 2 is connected to the square wave output module 3, the current acquisition module 4, the display 5, and the alarm module 6; the main controller 2 controls the square wave output module 3 to output a square wave with a period and a duty cycle to provide an input voltage for the vehicle light 7; the current acquisition module 4 collects the periodic irregular current value of the vehicle light 7 in real time, and converts it into a level signal and outputs it to the main controller 2; the main controller 2 outputs the current waveform to the display 5, and the main controller 2 outputs the judgment result to the alarm module 6.

[0030] Combination Figure 2 The power supply module includes an input terminal H2, a diode D1, a voltage regulator T1, capacitors C1, C2, C3, C4, and a three-terminal voltage regulator U1. The input terminal H2 is connected to the input power supply, and pin 1 of the input terminal H2 is connected to the anode of the diode D1 and the cathode of the voltage regulator T1. Pin 2 of the input terminal H2 and the anode of the voltage regulator T1 are grounded; the cathode of the diode D1 is connected to one end of the capacitor C1, one end of the capacitor C2, and pin 1 of the three-terminal voltage regulator U1, the other end of the capacitor C1, the other end of the capacitor C2, and pin 2 of the three-terminal voltage regulator U1 are grounded, and pin 3 of the three-terminal voltage regulator U1 is connected to one end of the capacitor C3 and one end of the capacitor C4 and outputs a +5V power supply, and the other end of the capacitor C3 and the other end of the capacitor C4 are grounded.

[0031] The diode D1 adopts ISMB28CAT3 anti-reverse connection diode to prevent short circuit caused by reverse connection of the power supply at the input end of the power module 1; the three-terminal voltage regulator U1 adopts LM2940S low voltage difference three-terminal voltage regulator chip, which can convert the input end 10~20V voltage into 5V voltage, and the overvoltage protection function is activated when the input end voltage is greater than 30V, and the output voltage becomes 0V.

[0032] Combination Figure 3 The square wave output module includes resistors R9, R10, R11, R12, R13, R14, MOS tube Q3, transistor Q4, photoelectric coupler U6, +5V power supply, +12V power supply, one end of resistor R9 is connected to the control signal T-SIN, the other end of resistor R9 is connected to one end of resistor R10 and the base of transistor Q4, the other end of resistor R10 and the emitter of transistor Q4 are grounded; the collector of transistor Q4 is connected to pin 2 of photoelectric coupler U6, and the photoelectric coupler U Pin 1 of U6 is connected to one end of resistor R11, the other end of resistor R11 is connected to a +5V power supply, pin 3 of photocoupler U6 is connected to one end of resistor R12, the other end of resistor R12 is grounded, pin 4 of photocoupler U6 is connected to one end of resistor R13 and the gate of MOS tube Q3; the other end of resistor R13 is connected to the source of MOS tube Q3 and a +12V power supply, the drain of MOS tube Q3 is connected to one end of resistor R14 and outputs a PWM signal, and the other end of resistor R14 is grounded.

[0033] The photocoupler U6 is a PS2561 photocoupler. The transistor Q4 is an NPN transistor, which is 9013. The MOS tube Q3 is a P-MOS.

[0034] In specific operation, when the control signal T-SIN outputs a high level, the transistor Q4 is turned on, the light-emitting diode of the photocoupler U6 emits light, the phototransistor is turned on, and a -12V voltage is added between the gate and the source of the MOS tube Q3. Since the MOS tube Q3 is a P-MOS, the MOD tube Q3 is turned on, and the PWM signal output terminal outputs a high level, which is consistent with the control signal T-SIN. When the control signal T-SIN outputs a low level, the transistor Q4 has no base current, the photocoupler U6 is not turned on, there is no voltage difference between the gate and the source of the MOS tube Q4, the MOS tube Q4 is not turned on, and the PWM signal output terminal outputs a low level, which is consistent with the control signal T-SIN.

[0035] The main controller 2 can output a 5V square wave signal of a specified period and duty cycle to the square wave output module 3. The square wave output module 3 converts the 5V square wave signal into a 12V square wave level, thereby meeting the lighting requirements of different types of vehicle lights.

[0036] The current acquisition module 4 acquires the periodically irregularly changing current value of the headlight 7 in real time and converts it into a level signal. The main controller 2 converts these level signals into the actual current value of the headlight 7 through calculation and conversion.

[0037] The display 5 receives the current signal sent by the main controller 2 in real time, displays it on the interface, and generates the current waveform of the vehicle lamp 7 .

[0038] Combination process Figure 4, a method for detecting periodic irregular current changes of a vehicle lamp, comprising the following steps:

[0039] S1, the main controller 2 controls the square wave output module 3 to generate a 2-cycle square wave, and collects the lamp current through the current collection module 4, so that the lamp has a complete cycle of current waveform;

[0040] S2, the main controller 2 converts all the level signals collected by the current acquisition module 4, converts the level signals into actual current values, and sends the current waveform to the display for display;

[0041] S3, the main controller 2 screens and determines the current value, first determines the starting position of the current waveform according to the minimum value, and then confirms the size and duration of each current segment according to the set value;

[0042] S4, the main controller 2 determines the magnitude and duration of each current value, and the current magnitude, duration and determination result are sent to the display 5 for display. If all are qualified, an OK signal is output, and if only one item is unqualified, an NG signal is output to the alarm module 6;

[0043] S5, the alarm module 6 uses light and sound to alarm at the same time. When an OK signal is received, the green light is on. When an NG signal is received, the red light is on and there is a sound alarm prompt.

[0044] In summary, the embodiments of the present invention are a device and method for detecting periodic irregular current changes in vehicle lamps. By collecting current for data analysis, the magnitude and duration of each group of currents are determined, and whether the waveform of the vehicle lamp current meets the requirements is accurately calculated. All current data within two cycles are collected for analysis. If the vehicle lamp current waveform has a delay relative to the rising edge of the voltage, the delay time can be calculated based on the length of the last section of the current waveform. The vehicle lamp current can be collected in real time, and the current magnitude, duration and determination result can be displayed on a display.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting periodic irregular current changes of vehicle lights, characterized in that: Detection using a current detection device for periodic irregular changes in vehicle lights: The detection device comprises: Power module, main controller, square wave output module, current acquisition module, display, alarm module, headlight; the power module is connected with the main controller, square wave output module, current acquisition module, display and alarm module to provide stable power supply voltage for each module; the main controller is connected with the square wave output module, current acquisition module, display and alarm module; the main controller controls the square wave output module to output a square wave with a period and duty cycle to provide input voltage for the headlight; the current acquisition module collects the periodic and irregular current value of the headlight in real time, and converts it into a level signal and outputs it to the main controller; the main controller outputs the current waveform to the display, and the main controller outputs the judgment result to the alarm module; The power supply module includes an input terminal H2, a diode D1, a voltage regulator T1, capacitors C1, C2, C3, C4, and a three-terminal voltage regulator U1, wherein the input terminal H2 is connected to an input power supply, a pin 1 of the input terminal H2 is connected to an anode of the diode D1 and a cathode of the voltage regulator T1, and a pin 2 of the input terminal H2 and an anode of the voltage regulator T1 are grounded; the cathode of the diode D1 is connected to one end of the capacitor C1, one end of the capacitor C2, and a pin 1 of the three-terminal voltage regulator U1, the other end of the capacitor C1, the other end of the capacitor C2, and a pin 2 of the three-terminal voltage regulator U1 are grounded, a pin 3 of the three-terminal voltage regulator U1 is connected to one end of the capacitor C3 and one end of the capacitor C4 and outputs a +5V power supply, and the other end of the capacitor C3 and the other end of the capacitor C4 are grounded; The detection method comprises the following steps: S1. The main controller controls the square wave output module to generate a 2-cycle square wave, and collects the lamp current through the current acquisition module, so that the lamp has a complete cycle of current waveform; S2, the main controller converts all the level signals collected by the current acquisition module, converts the level signals into actual current values, and sends the current waveform to the display for display; S3, the main controller screens and determines the current value, first determines the starting position of the current waveform according to the minimum value, and then confirms the size and duration of each current segment according to the set value; S4. The main controller determines the magnitude and duration of each current value. The current magnitude, duration and determination results are sent to the display for display. If all are qualified, an OK signal is output. If only one item is unqualified, an NG signal is output to the alarm module. S5. The alarm module uses light and sound to alarm at the same time. When an OK signal is received, the green light is on. When an NG signal is received, the red light is on and there is a sound alarm prompt.

2. A method for detecting periodic irregular current changes of vehicle lights as claimed in claim 1, characterized in that: The diode D1 adopts ISMB28CAT3 anti-reverse connection diode; the three-terminal voltage regulator U1 adopts LM2940S low voltage difference three-terminal voltage regulator chip.

3. A method for detecting periodic irregular current changes of vehicle lamps as claimed in claim 1, characterized in that: The square wave output module includes resistors R9, R10, R11, R12, R13, R14, MOS tube Q3, transistor Q4, photocoupler U6, +5V power supply, +12V power supply, one end of resistor R9 is connected to the control signal T-SIN, the other end of resistor R9 is connected to one end of resistor R10 and the base of transistor Q4, and the other end of resistor R10 and the emitter of transistor Q4 are grounded; The collector of transistor Q4 is connected to pin 2 of photocoupler U6, pin 1 of photocoupler U6 is connected to one end of resistor R11, the other end of resistor R11 is connected to a +5V power supply, pin 3 of photocoupler U6 is connected to one end of resistor R12, the other end of resistor R12 is grounded, pin 4 of photocoupler U6 is connected to one end of resistor R13 and the gate of MOS tube Q3; the other end of resistor R13 is connected to the source of MOS tube Q3 and a +12V power supply, the drain of MOS tube Q3 is connected to one end of resistor R14 and outputs a PWM signal, and the other end of resistor R14 is grounded.

4. A method for detecting periodic irregular current changes of vehicle lamps as claimed in claim 3, characterized in that: The photoelectric coupler U6 is a PS2561 photocoupler; the transistor Q4 is an NPN transistor, which is 9013; and the MOS transistor Q3 is a P-MOS.

Images