Vehicle light control system and control method thereof

Abstract

The invention discloses a vehicle light control system and method, and the system comprises an input module which comprises a D2 anti-reverse diode, a C2 filter capacitor and a C3 filter capacitor, and the D2 anti-reverse diode is used for preventing the reverse connection of a power supply; the ADS lamp driving part circuit comprises a U2 special LED driving chip and an output filter capacitor; according to the logic control part circuit, a TL signal input pin of a single-chip microcomputer is connected with the output end of a vehicle steering signal sensor, and an ADKZ signal input pin of the single-chip microcomputer is connected with the output end of a vehicle related state detection circuit; by means of the steering lamp driving part circuit and the constant current module, intelligent, efficient and stable control over a vehicle lighting system is achieved, and the vehicle driving safety and the energy utilization efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle electronic control, and particularly relates to a vehicle lighting control system and a control method thereof. Background Art

[0002] During the driving process of a vehicle, the lighting system plays a crucial role, not only for illumination but also for conveying the driving intention and status of the vehicle to other road users. There are many deficiencies in the existing vehicle lighting systems: Simple control logic: Traditional lighting control often only realizes basic on-off functions and lacks the ability to intelligently switch according to various vehicle states. For example, it cannot comprehensively control the lighting based on various factors such as whether the vehicle is in an assisted driving state, a turning state, etc., and cannot meet the requirements of increasingly complex traffic scenarios.

[0003] Poor stability: In the face of power fluctuations, electromagnetic interference, etc., the lighting system is prone to problems such as flickering, unstable brightness, and even failures. The existing drive circuit design lacks effective protection and stabilization measures when dealing with these situations.

[0004] High energy consumption: It does not adopt an efficient energy-saving control strategy, resulting in energy waste when the lighting is unnecessarily highly bright or on for a long time, increasing the vehicle operation cost.

[0005] Therefore, there is an urgent need for a vehicle lighting control system and a control method thereof that have intelligent logic control, high stability, and energy-saving characteristics. Summary of the Invention

[0006] Aiming at the deficiencies of the existing technology, the present invention aims to provide a vehicle lighting control system and a control method thereof to achieve intelligent, efficient, and stable control of the vehicle lighting system, and improve the driving safety and energy utilization efficiency of the vehicle.

[0007] To achieve the above object, the present invention provides the following technical solutions: A vehicle lighting control system includes an input module: including a D2 anti-reverse diode, and C2 and C3 filter capacitors. The D2 anti-reverse diode can prevent reverse connection of the power supply and avoid damage to circuit components due to reverse power supply connection; the C2 and C3 filter capacitors are multi-layer ceramic capacitors, and taking advantage of their small volume, low equivalent series resistance (ESR), and high self-resonant frequency, they perform efficient filtering on the input power supply within a wide frequency range, removing high-frequency noise and ripple, and providing a stable and pure power supply for the subsequent circuit.

[0008] As a further solution of the present invention, the circuit of the ADS lamp driving part: It is centered on the dedicated LED driving chip U2 and configured with relevant components. This chip has efficient power conversion and stable current output capabilities. The power supply pin is connected to the power supply filtered by the input module, and the signal input pin is connected to the corresponding output pin of the logic control part circuit. The ADS lamp string is connected to the output end of the chip. The output filter capacitor adopts the parallel connection method of an electrolytic capacitor and a ceramic capacitor. The electrolytic capacitor filters out low-frequency ripples, and the ceramic capacitor filters out high-frequency noises to stabilize the output voltage. At the same time, Pulse Width Modulation (PWM) technology is adopted. The PWM signals with different duty cycles are output from the logic control part circuit to the dimming pin of the driving chip to realize the brightness adjustment of the ADS lamp.

[0009] As a further solution of the present invention, the circuit of the logic control part: The power supply pin of the single-chip microcomputer is connected to a stable power supply (5V or 3.3V), and the grounding pin is reliably grounded. The TL signal input pin is connected to the output end of the vehicle steering signal sensor, and the ADKZ signal input pin is connected to the output end of the vehicle-related state detection circuit (such as the auxiliary driving state detection). Multiple control pins such as P12 are respectively connected to the control ends of the ADS lamp driving circuit and the turn signal driving circuit through current-limiting resistors with appropriate resistance values. In the program initialization stage, the functions of each pin are configured, and the signal acquisition pins are configured as input pull-up modes to ensure stable signal acquisition. The single-chip microcomputer outputs control signals according to the high and low level states of signals such as TL and ADKZ according to the preset logic.

[0010] As a further solution of the present invention, the circuit of the turn signal driving part: It adopts a discrete component constant current scheme. Q1 is a power NPN triode, which has a high current amplification factor and fast switching speed to meet the large current driving requirements of the turn signal; D10 is a clamping triode to prevent other components from being damaged by the back electromotive force in the circuit; R6 and R7 are current-limiting resistors, and their types are accurately selected according to the rated current and working voltage of the turn signal through Ohm's law. The positive and negative poles of the turn signal are connected to the output end of the constant current module. The constant current module adopts a negative feedback control mechanism. The current is monitored in real time by a series of small-value sampling resistors. The voltage signal at both ends of the sampling resistor is fed back to the input end of the operational amplifier. After being compared with the reference voltage, an error signal is output to the base of the Q1 triode to dynamically adjust the conduction degree of the triode to achieve accurate control of the turn signal current and ensure that the current is constant.

[0011] As a further solution of the present invention, the constant current module: In addition to being applied in the circuit of the turn signal driving part, in the circuit of the ADS lamp driving part, a similar constant current sub-module is set according to actual needs. On the basis of the constant current control circuit inside the ADS lamp driving chip, a constant current compensation circuit composed of transistors and resistors is additionally added to perform secondary adjustment on the output current of the chip to ensure that the ADS lamp can obtain a stable driving current under different working conditions and improve the consistency and stability of the lamp brightness.

[0012] The present invention also provides a vehicle lighting control method, which includes the following steps: Signal acquisition: The single-chip microcomputer collects the signal level states of TL, ADKZ, etc. in real time through the internal analog-to-digital conversion (ADC) module or digital input pins. To improve accuracy and anti-interference ability, a software filtering algorithm is adopted. For example, the signal level is continuously collected 10 times, and after removing the maximum and minimum values, the average value of the remaining 8 values is calculated, and this average value is used as the final collected signal level state.

[0013] Logic judgment and control output: According to the collected signal level state after filtering processing, the single-chip microcomputer makes judgments according to the preset logic. The specific logic is as follows: When TL is at a high level, if ADKZ is at a high level, the single-chip microcomputer outputs a low level at the P12 pin, the ADS lamp does not light up, the turn signal lights up, and the turn signal cycle timing is started at the same time; if ADKZ is at a low level, the single-chip microcomputer outputs a low level at the P12 pin, the ADS lamp does not light up, the turn signal lights up, and the turn signal cycle timing is also started.

[0014] When TL is at a low level, if ADKZ is at a high level, the single-chip microcomputer outputs a high level at the P12 pin, and the ADS lamp is highly bright; if ADKZ is at a low level, the single-chip microcomputer outputs a PWM signal at the P12 pin, and the ADS lamp is dimly bright.

[0015] As a further solution of the present invention, during the turn signal cycle timing, if the timing ends and the TL signal is not received, when ADKZ is at a high level, P12 outputs a high level, the ADS lamp is highly bright, and the turn signal does not light up; when ADKZ is at a low level, P12 outputs a PWM signal, the ADS lamp is dimly bright, and the turn signal does not light up.

[0016] Circular monitoring: After completing a logic judgment and control output, the program returns to the signal acquisition step and continuously loops to execute, in real time responding to changes in the vehicle state and dynamically adjusting the working mode of the lighting system.

[0017] The present invention has the following beneficial effects: Through the unique logic control partial circuit and control method of the present invention, it can intelligently switch the on / off and brightness of the turn signal and the ADS lamp according to various factors such as the vehicle turning state (TL signal), assisted driving and other related states (ADKZ signal), etc., meet the lighting requirements in different driving scenarios, and improve the driving safety and functionality of the vehicle.

[0018] High stability: The reverse connection prevention and efficient filtering design of the input module, the stable output of the ADS lamp driving partial circuit and the application of the constant current module, as well as the constant current control of the turn signal driving partial circuit effectively resist the influence of power fluctuations, electromagnetic interference, etc., ensure the stable operation of the lighting system, and extend the service life of the lighting system and related components.

[0019] Energy conservation and consumption reduction: The brightness of the ADS lamp is controlled by using PWM dimming technology, and the lighting is reasonably controlled according to the vehicle status to avoid unnecessary high brightness or long lighting of the lamp, reduce the vehicle energy consumption, and meet the requirements of green energy conservation.

[0020] To more clearly illustrate the structural features and functions of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the vehicle lighting control system mentioned in the present invention. Detailed Embodiments

[0022] The present invention will be further described below in conjunction with the accompanying drawings and relevant knowledge, and will be described clearly and completely. Obviously, the described applications are only a part of the embodiments of the present invention, rather than all embodiments.

[0023] Embodiment 1, see Figure 1 As shown, a vehicle lighting control system includes an input module: The D2 Schottky anti-reverse diode is connected to the circuit according to the correct polarity, its anode is connected to the possible connection end of the power supply negative pole, and the cathode is connected to the power supply input end of the subsequent circuit. C2 and C3 multilayer ceramic capacitors are connected in parallel on the power input line, one end of the capacitor is connected to the power supply positive input line, and the other end is connected to the power supply negative input line to ensure effective filtering of the input power supply.

[0024] The circuit of the ADS lamp driving part: Place the U2 LED driving chip at a suitable PCB layout position. According to the requirements of the chip data manual, connect its power supply pin to the power supply line output by the input module through a wire, and connect a small-capacity ceramic capacitor (such as 0.1 μF) in parallel on the power supply pin for high-frequency filtering. The signal input pin is connected to the corresponding control pin of the single-chip microcomputer in the logic control part circuit through a wire with appropriate length and impedance matching, and a current-limiting resistor (such as 10 kΩ) is connected in series. The positive and negative poles of the ADS lamp string are respectively connected to the output pins of the driving chip, and the output filter capacitor is connected between the output end of the driving chip and the ground in the form of a parallel connection of an electrolytic capacitor and a ceramic capacitor. The capacity of the electrolytic capacitor is selected according to actual needs (such as 100 μF), and the ceramic capacitor is selected in the common 0.1 μF specification.

[0025] Logic control section circuit: Install the microcontroller in the control area of the PCB board to ensure good heat dissipation and electrical isolation. The power supply pins are connected to the output terminal of the vehicle power supply system after voltage stabilization through a power cord. For example, a linear voltage regulator or a switching voltage regulator is used to convert the vehicle's 12V power supply into the 5V or 3.3V power supply required by the microcontroller. The ground pin is reliably connected to the ground layer of the PCB board through a thick wire. The TL signal input pin is connected to the output terminal of the vehicle steering signal sensor through a shielded wire, and one end of the shield layer is grounded to prevent electromagnetic interference; the ADKZ signal input pin is connected to the output terminal of the vehicle-related status detection circuit in the same way. The control pins such as P12 of the microcontroller are connected to the control terminals of the ADS lamp drive circuit and the turn signal drive circuit through wires of appropriate length. The wires should be as short as possible and necessary impedance matching treatment should be carried out, and a current-limiting resistor (select an appropriate resistance value according to the actual circuit drive requirements, such as 220Ω) is connected in series at the same time.

[0026] Turn signal drive section circuit: Install the Q1 power NPN transistor in the package position with a heat sink to ensure effective heat dissipation when it works under high current. The base is connected to the control signal output pin of the microcontroller in the logic control section circuit through a current-limiting resistor (such as 1kΩ), and at the same time, a small-capacity capacitor (such as 100pF) is connected to the ground for high-frequency filtering and signal stabilization. The collector is connected to the positive power supply, the emitter is connected to the positive pole of the turn signal, and the negative pole of the turn signal is connected to the ground. The D10 clamping transistor is connected in the circuit according to the correct polarity. Its collector is connected to the collector of Q1, the emitter is connected to the emitter of Q1, and the base is left floating. The R6 and R7 current-limiting resistors are connected in series in the turn signal power supply circuit. After calculating the resistance value according to the rated current and working voltage of the turn signal, they are installed. For example, if the rated current of the turn signal is 0.5A and the working voltage is 12V, considering factors such as the voltage drop of the transistor, the total resistance value of R6 and R7 can be selected to be about 20Ω.

[0027] Constant current module: In the ADS lamp drive section circuit, select appropriate transistors (such as small-power NPN transistors) and resistors to build a constant current compensation circuit. The base of the transistor is connected to a resistor (such as 10kΩ) to the current feedback pin of the ADS lamp drive chip, the emitter is connected to the ground, and the collector is connected to the output terminal of the drive chip through an adjustable resistor (such as a 100Ω potentiometer). By adjusting the resistance value of the potentiometer, the output current of the chip can be finely adjusted for the second time to ensure the stability of the ADS lamp current. In the turn signal drive section circuit, a sampling resistor (such as 0.1Ω) is connected in series at one end of the turn signal power supply circuit close to the ground. The voltage across its two ends is connected to the positive and negative input terminals of the operational amplifier through two wires. The output terminal of the operational amplifier is connected to the base of the Q1 transistor through a resistor (such as 1kΩ). The positive power supply pin of the operational amplifier is connected to the positive power supply, and the negative power supply pin is connected to the ground. By adjusting the reference voltage of the operational amplifier (which can be achieved through a potentiometer), the constant current value of the turn signal is set.

[0028] The control method of the vehicle lighting control system of the present invention has the following specific process: Initialization: After the single-chip microcomputer is powered on and reset, the initialization program is executed first. Set the initial states of each pin, set all output pins to low level to prevent accidental triggering of the lights at the moment of power-on. Configure relevant resources such as timers and interrupts. For example, use the timer interrupt function to set a timer for timing the turn signal cycle, and enable the external interrupt function to respond in real time to the level changes of signals such as TL and ADKZ. Load the preset logical control parameters, such as the lighting control strategies corresponding to different signal combinations. These parameters are stored in the non-volatile memory (such as EEPROM or Flash) of the single-chip microcomputer and are loaded into the program running memory through the corresponding reading function.

[0029] Signal acquisition: The single-chip microcomputer uses the internal analog-to-digital conversion (ADC) module or digital input pins to collect the level states of signals such as TL and ADKZ in real time. In the acquisition function, software filtering algorithms such as the median filtering method or the moving average filtering method are used.

[0030] Logical judgment and control output: According to the filtered signal level states collected, the single-chip microcomputer makes judgments according to the preset logic. Use conditional judgment statements (such as if-else statements) to implement logical judgments.

[0031] Loop monitoring: The main program uses an infinite loop structure to continuously call the signal acquisition and logical judgment control functions to respond in real time to the changes in the vehicle state and dynamically adjust the working mode of the lighting system.

[0032] Through the above detailed hardware connection and control process, the vehicle lighting control system and its control method of the present invention can operate efficiently and stably, realizing the intelligent control of the vehicle turn signals and ADS lights, and meeting the diverse lighting requirements during vehicle driving.

[0033] The above describes the technical principle of the present invention in combination with specific embodiments, which is only the preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. Those skilled in the art can think of other specific embodiments of the present invention without creative labor, and these embodiments will fall within the protection scope of the present invention.

Claims

1. A vehicle lighting control system, characterized in that, Including: An input module, the input module includes a D2 anti-reverse diode, C2 and C3 filter capacitors, and the D2 anti-reverse diode is used to prevent reverse connection of the power supply; The ADS lamp driving part circuit includes a U2 dedicated LED driving chip and an output filter capacitor. The U2 dedicated LED driving chip is used to drive the ADS lamp string. The output filter capacitor adopts a parallel connection method of an electrolytic capacitor and a ceramic capacitor to stabilize the output voltage. And this circuit adopts pulse width modulation technology to realize the brightness adjustment of the ADS lamp by receiving PWM signals with different duty cycles output by the logic control part circuit; The logic control part circuit, the TL signal input pin of the single-chip microcomputer is connected to the output end of the vehicle steering signal sensor, the ADKZ signal input pin is connected to the output end of the vehicle related state detection circuit, and multiple control pins are respectively connected to the control ends of the ADS lamp driving circuit and the turn signal driving circuit. The single-chip microcomputer outputs a control signal according to the high and low level states of the TL and ADKZ signals according to the preset logic; The turn signal driving part circuit includes a Q1 power NPN transistor, a D10 clamping transistor, R6 and R7 current limiting resistors. The Q1 power NPN transistor is used to meet the large current driving requirements of the turn signal, and the D10 clamping transistor is used to prevent damage to components by the back electromotive force; A constant current module, in the ADS lamp driving part circuit, is used for secondary adjustment of the current output by the chip. In the turn signal driving part circuit, the constant current module is used to ensure that the ADS lamp and the turn signal can obtain stable driving current under different working conditions.

2. The vehicle lighting control system according to claim 1, wherein In the input module, the D2 anti-reverse diode is a Schottky diode, and its fast recovery characteristic is used to prevent the large current impact at the moment of reverse connection of the power supply. The C2 and C3 filter capacitors adopt multi-layer ceramic capacitors to efficiently filter the input power supply in a wide frequency range and remove high-frequency noise and ripple.

3. The vehicle lighting control system according to claim 1, wherein, In the ADS lamp driving part circuit, the U2 dedicated LED driving chip has the capabilities of efficient power conversion and stable current output. Its power pin is connected to the power supply filtered by the input module, the signal input pin is connected to the corresponding control pin of the single-chip microcomputer in the logic control part circuit, and a current limiting resistor is connected in series.

4. The vehicle lighting control system according to claim 1, wherein, In the logic control part circuit, the preset logic includes: when TL is at a high level, if ADKZ is at a high level, the P12 pin of the single-chip microcomputer outputs a low level, the ADS lamp is not lit, the turn signal is lit, and at the same time, the turn signal cycle timing is started; if ADKZ is at a low level, the P12 pin of the single-chip microcomputer outputs a low level, the ADS lamp is not lit, the turn signal is lit, and at the same time, the turn signal cycle timing is started; when TL is at a low level, if ADKZ is at a high level, the P12 pin of the single-chip microcomputer outputs a high level, and the ADS lamp is highly lit; if ADKZ is at a low level, the P12 pin of the single-chip microcomputer outputs a PWM signal, and the ADS lamp is dimly lit; during the turn signal cycle timing process, if the timing ends and the TL signal is not received, when ADKZ is at a high level, P12 outputs a high level, the ADS lamp is highly lit, and the turn signal is not lit; when ADKZ is at a low level, P12 outputs a PWM signal, the ADS lamp is dimly lit, and the turn signal is not lit.

5. The vehicle lighting control system according to claim 1, wherein In the turn signal driving part circuit, the base of the Q1 power NPN transistor is connected to a current-limiting resistor and a high-frequency filtering capacitor, the collector is connected to the positive power supply, the emitter is connected to the positive terminal of the turn signal, the negative terminal of the turn signal is connected to the ground. The R6 and R7 current-limiting resistors are accurately selected according to the rated current and operating voltage of the turn signal through Ohm's law. And this circuit adopts a negative feedback control mechanism, monitors the current in real time by connecting a small-value sampling resistor in series, and after comparing the voltage signal across the sampling resistor with the reference voltage by using an operational amplifier, outputs an error signal to the base of the Q1 transistor to dynamically adjust the conduction degree of the transistor, so as to achieve precise control of the turn signal current.

6. The vehicle lighting control system according to claim 1, characterized in that In the constant current module, in the constant current compensation circuit of the ADS lamp driving part circuit, the base of the transistor is connected to a resistor to the current feedback pin of the ADS lamp driving chip, the emitter is connected to the ground, and the collector is connected to the output terminal of the driving chip through a variable resistor.

7. The vehicle lighting control system according to claim 1, characterized in that, The vehicle lighting control system further includes an electromagnetic shielding structure, and the electromagnetic shielding structure covers the PCB board areas of the logic control part circuit, the ADS lamp driving part circuit and the turn signal driving part circuit, so as to reduce the influence of electromagnetic interference on the circuit.

8. The vehicle lighting control system according to claim 1, characterized in that, In the logic control part circuit, when the single-chip microcomputer collects signals, a software filtering algorithm is adopted. The software filtering algorithm includes the median filtering method or the moving average filtering method, which is used to improve the accuracy and anti-interference ability of signal collection.

9. A control method for a vehicle lighting control system according to any one of claims 1-8, characterized in that, It includes the following steps: Initialize the single-chip microcomputer, set the initial state of each pin to output low level, configure the timer and interrupt resources, and load the preset logic control parameters; The single-chip microcomputer collects the signal level states of TL and ADKZ in real time and processes the collected signals by using a software filtering algorithm; According to the collected and processed signal level states, the single-chip microcomputer makes a judgment according to the preset logic and outputs a control signal to control the on / off and brightness of the ADS lamp and the turn signal; Continuously loop the above signal collection, logical judgment and control output steps, respond to the vehicle state changes in real time, and dynamically adjust the working mode of the lighting system. In the single-chip microcomputer initialization step, the timer is used to time the turn signal cycle, and the external interrupt is used to respond to the level changes of the TL and ADKZ signals in real time. The preset logic control parameters are stored in the non-volatile memory of the single-chip microcomputer and loaded into the program running memory through the read function.

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