Automobile reading lamp control system and automobile

Abstract

This invention provides an automotive reading light control system and an automotive vehicle. The system includes: a vehicle control module, a signal protection module, an MCU control chip, a light switch, a door control switch, and an LED light source. The positive power port of the vehicle control module is connected to the MCU control chip via the signal protection module. One end of the light switch and the door control switch are connected to the negative power port of the vehicle control module, and the other end is connected to the MCU control chip. The vehicle control module sends door control signals to the MCU control chip in real time and controls the changing trend of the door control signals according to the on / off state of the vehicle door locks, so that the MCU control chip controls the working state of the LED light source based on the changing trend. The MCU control chip is also used to control the working state of the LED light source according to the working state of the light switch and the door control switch. This invention can simplify the automotive reading light control circuit while realizing intelligent control of the reading lights.

Description

Technical Field

[0001] This invention relates to the field of automotive electronics technology, and in particular to an automotive reading light control system and an automobile. Background Technology

[0002] Car reading lights are auxiliary lighting devices installed inside a car, typically in the ceiling, front and rear doors, and center armrest. Their main function is to provide localized lighting for passengers at night or in low light conditions, making it easier for them to read books, use their phones, or engage in other activities.

[0003] Common automotive reading light control methods include manual and automatic control. Manual control involves manually turning the reading lights on or off using mechanical switches, touch switches, or buttons. However, since the current from the LED light source needs to flow through the switch, only self-locking mechanical switches with high current carrying capacity can be used. This limits the choice of switch, preventing the use of non-self-locking switches, microswitches, or touch switches. Furthermore, this solution can only achieve basic on / off functions and cannot implement more complex logic control, such as time-delay control or sensor control. Automatic control, on the other hand, uses the vehicle's CAN or LIN bus, allowing the vehicle control system to communicate with the reading lights. It uses a microcontroller for complex logic control, automatically controlling the reading lights' on / off state based on various conditions (such as time, vehicle speed, and door status). However, this solution uses more chips, resulting in complex circuitry and greater design and debugging difficulties. Due to the use of more chips and complex circuitry, the overall cost is higher, and the need for CAN or LIN bus communication occupies the vehicle's bus channel, potentially affecting the communication of other devices. This solution relies on the vehicle's bus and vehicle control system and is not backward compatible with some lower-end models that may not have CAN or LIN buses. Automotive reading lights are key components for improving passenger comfort and safety. How to simplify the control scheme of reading lights and further improve their performance and user experience is a technical problem that urgently needs to be solved in the design of intelligent vehicles. Summary of the Invention

[0004] The present invention aims to provide an automotive reading light control system and an automobile to solve the above-mentioned technical problems, and to achieve intelligent control of the reading lights while simplifying the automotive reading light control circuit.

[0005] To solve the above-mentioned technical problems, the present invention provides an automotive reading light control system, comprising: a vehicle control module, a signal protection module, an MCU control chip, a light switch, a door control switch, and an LED light source;

[0006] The positive power port of the vehicle control module is connected to the MCU control chip through the signal protection module; wherein, the signal protection module is used to convert the output voltage of the positive power port into the operating voltage of the MCU control chip;

[0007] One end of the light switch and the door control switch are connected to the negative power port of the vehicle control module, and the other end is connected to the MCU control chip; wherein, the light switch is used to receive manual light source on / off commands sent by the user, and the door control switch is used to receive automatic light source on / off commands sent by the user.

[0008] The vehicle control module sends door control signals to the MCU control chip in real time, and controls the changing trend of the door control signals according to the on / off state of the vehicle door locks, so that the MCU control chip controls the working state of the LED light source based on the changing trend;

[0009] The MCU control chip is also used to control the working state of the LED light source according to the working state of the lamp switch and the door control switch.

[0010] In the above solution, the vehicle control module provides power and management signals, without relying on complex bus communication. It communicates with the MCU control chip only through a simple electrical connection, without occupying the vehicle's bus channel and without requiring complex bus communication. The signal protection module converts the high voltage of the vehicle control module to the operating voltage of the MCU control chip, ensuring the safe operation of the MCU. As the core control unit, the MCU control chip receives signals from the light switches and door switches, using a single MCU control chip for comprehensive control, reducing the use of complex circuits and multiple chips, eliminating the need for complex logic circuits and multiple chips. Conventional light switch devices are retained, allowing users to manually control the LED light source to turn on and off, meeting personalized needs. The door switches automatically control the LED light source to turn on and off, enabling the MCU control chip to adjust the LED light source brightness according to the door status. This system does not rely on CAN or LIN buses, is suitable for various vehicle models, including low-end models without bus communication capabilities, and has broad market adaptability. Furthermore, the MCU control chip can provide a variety of complex logic control functions, intelligently adjusting the operating status of the light source according to various conditions.

[0011] In one implementation, the positive power port of the vehicle control module is connected to the MCU control chip via the signal protection module, specifically including:

[0012] The signal protection module includes an input filtering unit, an input protection unit, and a DC-DC constant current chip;

[0013] The filtering unit is used to remove noise from the output voltage to obtain a first filtered voltage;

[0014] The input protection unit is used to provide input protection for the first filtered voltage to obtain a first protection voltage; wherein, the input protection includes overvoltage protection, overcurrent protection and short-circuit protection;

[0015] The DC-DC constant current chip is used to convert the first protection voltage into a constant operating voltage.

[0016] In the above scheme, the input filtering unit removes power supply noise, ensuring the stability and purity of the output voltage, thereby improving the system's anti-interference capability. The input protection unit provides overvoltage protection, overcurrent protection, and short-circuit protection, ensuring the system remains safe and reliable under abnormal conditions. A DC-DC constant current chip converts the protected voltage into a constant operating voltage, ensuring the stable operation of the MCU control chip under different environmental conditions. Multi-level protection and a stable voltage supply improve the overall reliability of the system and reduce the probability of failure.

[0017] In one implementation, the vehicle control module sends a door control signal to the MCU control chip in real time, and controls the changing trend of the door control signal according to the on / off state of the vehicle door locks, specifically including:

[0018] The vehicle control module detects the on / off status of the vehicle door locks based on door lock switches or sensor devices;

[0019] When the vehicle door lock is detected to be closed, the door control signal is controlled to gradually change from a low level to a high level;

[0020] When the vehicle door lock is detected to be open, the door control signal is gradually changed from high level to low level.

[0021] In the above solution, the vehicle control module continuously monitors the door lock switches or sensor devices to obtain the current status of the vehicle door locks in real time. Once a change in the door lock status is detected, the trend of the door control signal is immediately adjusted to ensure timely system response. The door control signal adopts a gradual change method to avoid system shock or malfunction that may be caused by sudden signal changes. The gradual signal avoids instantaneous high voltage or high current, reducing the impact on the circuit.

[0022] In one implementation, the MCU control chip controls the operating state of the LED light source based on the changing trend, specifically including:

[0023] When the gate signal changes from a low level to a high level, the MCU control chip gradually turns off the LED light source based on the PWM signal with a first preset duty cycle.

[0024] When the gate signal changes from a high level to a low level, the MCU control chip gradually lights up the LED light source based on the PWM signal with a second preset duty cycle.

[0025] In the above solution, the LED light source is controlled by a gradual PWM signal, making the changes in light smoother and more natural, avoiding discomfort to passengers' eyes caused by sudden changes in light, and improving the user experience.

[0026] In one implementation, the MCU control chip is further configured to control the operating state of the LED light source based on the operating states of the lamp switch and the door control switch, specifically including:

[0027] Real-time detection of the state changes of the door control switch;

[0028] When the gate switch is opened, the MCU control chip acquires the duty cycle of the gate signal and controls the working state of the LED light source based on the duty cycle; wherein, the working state includes on, off, gradually brightening and gradually dimming.

[0029] In the above scheme, the MCU control chip continuously monitors the status of the gate switch to ensure that any changes in the switch can be captured in real time. The duty cycle determines the ratio of the high and low levels of the PWM signal. By acquiring the duty cycle of the gate signal, the MCU control chip can more accurately control the working state of the LED light source. Personalized lighting effects can be achieved based on different duty cycles to meet the needs of different users.

[0030] In one implementation, the MCU control chip acquires the duty cycle of the gate signal, specifically including:

[0031] The level of the gate signal is collected at preset time intervals, and the count value of the high-level counter is incremented by 1 when the level of the gate signal is high.

[0032] The cumulative number of times the gate signal is collected is calculated. When the preset number of level collections is reached, the counting result of the high-level counter is obtained, and the duty cycle of the gate signal is generated based on the counting result.

[0033] In the above scheme, the level of the gating signal is sampled at preset time intervals to ensure the uniformity and accuracy of sampling. The reliability of the data is ensured by accumulating the number of gating signal samplings. The duty cycle is calculated in software using the counting and logic processing capabilities of the MCU, reducing the need for dedicated hardware. Multiple samplings and cumulative counting reduce the impact of signal fluctuations on the duty cycle calculation.

[0034] In one implementation, the MCU control chip is further configured to control the operating state of the LED light source based on the operating states of the lamp switch and the door control switch, and further includes:

[0035] Obtain the current operating status of the LED light source;

[0036] During the maintenance of the current working state, if a change in the working state of the lamp switch is detected, the working state of the LED light source is controlled according to the switching command of the lamp switch.

[0037] In the above solution, the MCU control chip continuously monitors the status of the light switch to ensure that it can capture the user's operating intentions in real time. Once a change in the working state of the light switch is detected, the working state of the LED light source can be quickly adjusted to improve the user's interactive experience and satisfaction.

[0038] In one implementation, the automotive reading light control system is further configured to control the operating state of the LED light source according to the vehicle's driving status, specifically:

[0039] The vehicle control module also monitors the vehicle's driving status in real time;

[0040] When the vehicle collides, the control signal is abruptly switched to a low level so that the MCU control signal controls the LED light source to light up immediately based on the change trend of the control signal.

[0041] In the above solution, the vehicle control module continuously monitors the vehicle's driving status and can promptly detect collision events. Once a collision is detected, the control gate signal immediately abruptly drops to a low level, and the MCU control chip quickly adjusts the LED light source's operating state accordingly, illuminating it immediately. The immediate illumination of the LED light source during a collision helps occupants see their surroundings, improving their safety and ability to respond.

[0042] Secondly, this application also provides an automobile, including the automobile reading light control system described above. Attached Figure Description

[0043] Figure 1 This is a system framework diagram of an automotive reading light control system provided in one embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of a gating signal duty cycle calculation process provided in one embodiment of the present invention. Detailed Implementation

[0045] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0046] The terms "first" and "second," etc., in the specification, claims, and drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or apparatus.

[0047] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0048] Example 1

[0049] See Figure 1 , Figure 1 This is a system framework diagram of an automotive reading light control system provided in one embodiment of the present invention. The embodiment of the present invention provides an automotive reading light control system, including: a vehicle control module 101, a signal protection module 102, an MCU control chip 103, a light switch 104, a door control switch 105, and an LED light source 106;

[0050] The positive power port of the vehicle control module 101 is connected to the MCU control chip 103 via the signal protection module 102; wherein, the signal protection module 102 is used to convert the voltage output from the positive power port into the operating voltage of the MCU control chip 103.

[0051] One end of the light switch 104 and the gate switch 105 are connected to the negative power port of the vehicle control module 101, and the other end is connected to the MCU control chip 103; wherein, the light switch 104 is used to receive a manual light source on / off command sent by the user, and the gate switch 105 is used to receive a light source on / off command sent by the user.

[0052] The vehicle control module sends a door control signal to the MCU control chip in real time, and controls the duty cycle of the door control signal according to the on / off state of the vehicle door lock, so that the MCU control chip controls the working state of the LED light source based on the duty cycle change trend.

[0053] The MCU control chip is also used to control the working state of the LED light source according to the working state of the lamp switch and the door control switch.

[0054] In one embodiment, the positive power port of the vehicle control module is connected to the MCU control chip via the signal protection module, specifically including: the signal protection module includes an input filtering unit, an input protection unit, and a DC-DC constant current chip; the filtering unit is used to remove noise from the output voltage to obtain a first filtered voltage; the input protection unit is used to provide input protection for the first filtered voltage to obtain a first protection voltage; wherein, the input protection includes overvoltage protection, overcurrent protection, and short-circuit protection; the DC-DC constant current chip is used to convert the first protection voltage into a constant operating voltage.

[0055] The positive power port of the vehicle control module provides a stable DC power supply to power the reading light circuit. This is the foundation of the entire reading light control system, ensuring its proper functioning. The vehicle control module typically contains a power management module, which converts the 12V (or 24V) DC voltage from the vehicle battery to the required stable voltage, such as 5V or 3.3V. The positive power port usually draws power from the vehicle's battery or alternator, outputting a stable voltage through the power management module of the vehicle control module. In this embodiment, a filtering unit is used to remove ripple and other noise from the power supply, ensuring a stable and reliable voltage input to subsequent circuits. The filtering unit uses a combination of electrolytic capacitors and ceramic capacitors to filter out high-frequency and low-frequency noise. Preferably, an LC filter composed of inductors and capacitors can also be used to further improve the filtering effect. An input protection unit is used to prevent abnormal conditions such as overvoltage, overcurrent, and short circuits, ensuring the safety and reliability of the system. Specifically, Zener diodes or TVS (Transient Voltage Suppressor) diodes are used to prevent the input voltage from exceeding the safe range; fuses or polypropylene fuses (PPTC) are used to disconnect the circuit when the current exceeds a set value, achieving overcurrent protection; MOSFETs or relays are used to cut off the power supply when a short circuit is detected, achieving short-circuit protection. DC-DC constant current chips are used to convert the input voltage into a constant output current, providing a stable current for the MCU control chip. For example, suitable DC-DC constant current chips can be selected for the application, such as LM3404 and LM3410. Selecting a suitable constant current chip based on the input voltage range ensures that the output current remains constant when the input voltage changes.

[0056] In one embodiment, the vehicle control module sends a door control signal to the MCU control chip in real time, and controls the change trend of the door control signal according to the on / off state of the vehicle door lock. Specifically, the vehicle controller detects the on / off state of the vehicle door lock based on the door lock switch or sensor device; when the vehicle door lock is detected to be closed, the door control signal is controlled to gradually change from a low level to a high level; when the vehicle door lock is detected to be open, the door control signal is controlled to gradually change from a high level to a low level.

[0057] In this embodiment of the invention, a high-level door control signal indicates that the vehicle door lock is closed, and a low-level door control signal indicates that the vehicle door lock is open. When the door is closed, the switch is in a closed state (electrical signal path); when the door is open, the switch is in an open state (electrical signal disconnection). The door lock switch signal can be transmitted to the vehicle control module in a low-level or high-level active manner. Preferably, the door lock switch signal line can be directly connected to the input port (such as GPIO) of the vehicle control module. Alternatively, a sensor can be installed near the door or door lock; the strength of the magnetic field will change when the door lock is in different states (open or closed). The door lock status is determined by the sensor signal. When the vehicle door lock is detected to be closed, the vehicle control unit generates a signal that gradually transitions from a low level to a high level; when the vehicle door lock is detected to be open, the vehicle control unit generates a signal that gradually transitions from a high level to a low level. The MCU receives the door control signal through its input pin.

[0058] In one embodiment, the MCU control chip controls the working state of the LED light source based on the changing trend, specifically including: when the changing trend of the gate signal is from low level to high level, the MCU control chip gradually turns off the LED light source based on a PWM signal with a first preset duty cycle; when the changing trend of the gate signal is from high level to low level, the MCU control chip gradually turns on the LED light source based on a PWM signal with a second preset duty cycle.

[0059] In this embodiment of the invention, the MCU control chip receives gate control signals with different changing trends through its input pins. By detecting the rising and falling edges of the signals, the changing trend of the gate control signals is identified. A gradual change from a low level to a high level indicates that the door is closed. The MCU control chip generates a PWM signal based on a first preset duty cycle, gradually decreasing the LED brightness until it is off. An exemplary first preset duty cycle can be defined as a duty cycle sequence decreasing from 100% to 0%, with a step size adjustable to 5% or 10%. A gradual change from a high level to a low level indicates that the door is open. The MCU control chip generates a PWM signal based on a second preset duty cycle, gradually increasing the LED brightness until it is lit. An exemplary second preset duty cycle can be defined as a duty cycle sequence increasing from 0% to 100%, with a step size adjustable to 5% or 10%. Based on the changing trend of the gate control signals, PWM signals with different duty cycles are used to control the brightness of the LED light source. Through the cooperation of hardware and software, the gradual brightening and dimming effects of the LED light source are achieved.

[0060] In one embodiment, the MCU control chip is further configured to control the working state of the LED light source according to the working states of the lamp switch and the door control switch, specifically including: real-time detection of the state changes of the door control switch; when the door control switch is open, the MCU control chip acquires the duty cycle of the door control signal and controls the working state of the LED light source based on the duty cycle; wherein, the working state includes on, off, gradually brightening, and gradually dimming.

[0061] In this embodiment of the invention, the door control switch is used to receive an automatic light source on / off command sent by the user. The user triggers the door control switch to switch its working state by touching or operating it. The level state of the door control switch is read through the GPIO pin of the MCU control chip. GPIO (General Purpose Input / Output) pins are multi-functional digital pins on embedded devices such as microcontrollers, single-chip microcomputers (MCUs), and FPGAs (Field Programmable Gate Arrays). When the door control switch is open, the duty cycle of the door control signal is read, and the brightness of the LED is adjusted according to the duty cycle. Preferably, a filter circuit can also be added to the door control signal input terminal to reduce electromagnetic interference.

[0062] In one embodiment, the MCU control chip acquires the duty cycle of the gate signal, specifically including: acquiring the level of the gate signal at preset time intervals; incrementing the count value of the high-level counter by 1 when the level of the gate signal is high; accumulating the number of acquisitions of the gate signal; when the preset number of acquisitions is reached, obtaining the counting result of the high-level counter and generating the duty cycle of the gate signal based on the counting result.

[0063] See Figure 2 , Figure 2This is a schematic diagram illustrating a gating signal duty cycle calculation process according to one embodiment of the present invention. It should be noted that before starting the acquisition, both the high-level counter and the PWM wave counter are initialized to 0. These two counters will be used to record the number of high-level occurrences and the total number of PWM wave detections during the detection process. The preset number of level acquisitions can be set according to the frequency of the PWM wave and the desired accuracy, and is not limited here. In this embodiment, a gating signal frequency of 200Hz is used as an example. The frequency of the gating signal PWM wave is 200Hz, i.e., the period is 5ms. The MCU control chip will detect the voltage of the gating signal PWM wave every 100us (microseconds). Such a sampling frequency can ensure accurate capture of the high and low level changes of the PWM wave. The preset number of level acquisitions is set to 50 times as one detection cycle. During each detection, if the voltage of the gating signal is high, both the high-level counter and the PWM wave counter are incremented by 1. If a low level is detected, only the PWM wave counter is incremented by 1. This process is repeated until the preset number of level acquisitions is reached. After reaching the preset number of level acquisitions, the MCU stops acquiring data and uses the previously recorded counts to calculate the duty cycle of the gating signal. The duty cycle calculation formula is: Gating signal duty cycle = (High-level counter count value / PWM wave counter count value) * 100%. This formula reflects the proportion of the high level in the PWM wave cycle. After outputting the gating signal duty cycle, the MCU clears the high-level counter and the PWM wave counter to begin a new round of detection. Preferably, during the acquisition process, if the MCU control chip detects an abnormality (such as signal loss, counter overflow, etc.), it should immediately stop acquiring data and trigger the corresponding error handling mechanism.

[0064] In one embodiment, the MCU control chip is further configured to control the working state of the LED light source according to the working states of the lamp switch and the door control switch, and further includes: acquiring the current working state of the LED light source; and during the maintenance of the current working state, if a change in the working state of the lamp switch is detected, controlling the working state of the LED light source according to the switching instruction of the lamp switch.

[0065] In this embodiment of the invention, the lamp switch is a mechanical switch or an electronic switch, operated by the user to control the on / off state of the LED light source. When the LED light source is in the lit state, if a change in the state of the lamp switch is detected, the control chip sends a control signal to the LED light source to gradually turn off the LED light source; when the LED light source is in the off state, if a change in the state of the lamp switch is detected, the control chip sends a control signal to the LED light source to gradually turn on the LED light source.

[0066] In this embodiment of the invention, the MCU control chip comprehensively controls the working state of the LED light source through the lamp switch and the gate switch, using the duty cycle of the gate signal. See Table 1, which is a schematic diagram of LED light source control logic provided in this embodiment of the invention.

[0067] Table 1

[0068]

[0069] When the LED light source is lit: (1) If a change in the state of the light switch is detected (e.g., from on to off), the LED is controlled to gradually turn off; (2) If the duty cycle of the gate signal is detected to be 0%, the LED is kept lit; (3) If the duty cycle of the gate signal is detected to change from 0% to 100%, the LED is controlled to gradually turn off; (4) If the duty cycle of the gate signal is detected to be 100%, the LED is immediately turned off; (5) If the duty cycle of the gate signal is detected to change from 100% to 0%, the LED is kept lit.

[0070] When the LED light source is off: (1) if a change in the light switch state is detected (e.g., from off to on), the LED is gradually turned on; (2) if the duty cycle of the gate signal is detected to be 0%, the LED is immediately turned on; (3) if the duty cycle of the gate signal is detected to change from 0% to 100%, the LED remains off; (4) if the duty cycle of the gate signal is detected to be 100%, the LED remains off; (5) if the duty cycle of the gate signal is detected to change from 100% to 0%, the LED is gradually turned on. The MCU control chip realizes intelligent control of the LED light source's working state based on the state changes of the gate switch and the light switch, combined with the duty cycle of the gate signal PWM wave. This design not only improves the system's response speed and flexibility, but also enhances the user experience through gradual changes (gradual brightening, gradual dimming), while ensuring the system's stability and reliability under different states.

[0071] In one embodiment, the automotive reading light control system is further configured to control the operating state of the LED light source according to the vehicle's driving state. Specifically, the vehicle control module also detects the vehicle's driving state in real time; when the vehicle collides, it controls the gate signal to abruptly go low so that the MCU control signal controls the LED light source to light up immediately based on the changing trend of the gate signal.

[0072] In this embodiment of the invention, the vehicle control module monitors the vehicle's driving status in real time through sensor devices, including speed, acceleration, and collision sensor data. In the event of a collision or emergency, when the collision sensor detects a collision signal, it sends a collision signal to the vehicle control module. Upon receiving the collision signal, the vehicle control module immediately abruptly switches the gating signal to a low level. The MCU control chip detects the change in the gating signal (from high to low level) and immediately controls the LED light source to illuminate. By immediately illuminating the LED light source upon a collision, occupants can quickly assess their surroundings, ensuring passenger safety and preventing secondary injuries.

[0073] Preferably, this embodiment of the invention also provides a car that includes the car reading light control system described above.

[0074] This invention provides an automotive reading light control system. Power and management signals are provided by the vehicle control module, eliminating reliance on complex bus communication. Communication with the MCU control chip is achieved through a simple electrical connection, without occupying the vehicle's bus channels or requiring complex bus communication. A signal protection module converts the high voltage of the vehicle control module to the operating voltage of the MCU control chip, ensuring its safe operation. The MCU control chip, as the core control unit, receives signals from the light switch and door control switch. Comprehensive control is achieved using a single MCU control chip, reducing the need for complex circuits and multiple chips, eliminating the need for complex logic circuits and multiple chips. Conventional light switch devices are retained, allowing users to manually control the LED light source's on / off state to meet personalized needs. Automatic control of the LED light source's on / off state via the door control switch enables the MCU control chip to adjust the LED light source's brightness based on the door status. This system does not rely on CAN or LIN buses, making it suitable for various vehicle models, including low-end models without bus communication capabilities, and possessing broad market adaptability. Furthermore, the MCU control chip can provide various complex logic control functions, intelligently adjusting the light source's operating state according to various conditions.

[0075] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A car reading light control system, characterized in that, include: Vehicle control module, signal protection module, MCU control chip, light switch, door control switch and LED light source; The positive power port of the vehicle control module is connected to the MCU control chip through the signal protection module; wherein, the signal protection module is used to convert the output voltage of the positive power port into the operating voltage of the MCU control chip; One end of the light switch and the door control switch are connected to the negative power port of the vehicle control module, and the other end is connected to the MCU control chip; wherein, the light switch is used to receive manual light source on / off commands sent by the user, and the door control switch is used to receive automatic light source on / off commands sent by the user. The vehicle control module sends door control signals to the MCU control chip in real time, and controls the changing trend of the door control signals according to the on / off state of the vehicle door locks, so that the MCU control chip controls the working state of the LED light source based on the changing trend; specifically, the vehicle control module detects the on / off state of the vehicle door locks based on the door lock switch or sensor device; when the vehicle door lock is detected to be closed, the door control signal is controlled to gradually change from a low level to a high level; when the vehicle door lock is detected to be open, the door control signal is controlled to gradually change from a high level to a low level. The MCU control chip is also used to control the working state of the LED light source according to the working state of the lamp switch and the gate switch; specifically, when the gate signal changes from low level to high level, the MCU control chip gradually turns off the LED light source based on a PWM signal with a first preset duty cycle; when the gate signal changes from high level to low level, the MCU control chip gradually turns on the LED light source based on a PWM signal with a second preset duty cycle.

2. The automotive reading light control system as described in claim 1, characterized in that, The positive power port of the vehicle control module is connected to the MCU control chip via the signal protection module, specifically including: The signal protection module includes an input filtering unit, an input protection unit, and a DC-DC constant current chip; The input filtering unit is used to remove noise from the output voltage to obtain a first filtered voltage; The input protection unit is used to provide input protection for the first filtered voltage to obtain a first protection voltage; wherein, the input protection includes overvoltage protection, overcurrent protection and short-circuit protection; The DC-DC constant current chip is used to convert the first protection voltage into a constant operating voltage.

3. The automotive reading light control system as described in claim 1, characterized in that, The MCU control chip is also used to control the working state of the LED light source according to the working states of the lamp switch and the door control switch, specifically including: Real-time detection of the state changes of the door control switch; When the gate switch is opened, the MCU control chip acquires the duty cycle of the gate signal and controls the working state of the LED light source based on the duty cycle; wherein, the working state includes on, off, gradually brightening and gradually dimming.

4. The automotive reading light control system as described in claim 3, characterized in that, The MCU control chip acquires the duty cycle of the gate signal, specifically including: The level of the gate signal is collected at preset time intervals, and the count value of the high-level counter is incremented by 1 when the level of the gate signal is high. The cumulative number of times the gate signal is collected is calculated. When the preset number of level collections is reached, the counting result of the high-level counter is obtained, and the duty cycle of the gate signal is generated based on the counting result.

5. The automotive reading light control system as described in claim 3, characterized in that, The MCU control chip is also used to control the working state of the LED light source according to the working state of the lamp switch and the door control switch, and also includes: Obtain the current operating status of the LED light source; During the maintenance of the current working state, if a change in the working state of the lamp switch is detected, the working state of the LED light source is controlled according to the switching command of the lamp switch.

6. The automotive reading light control system as described in claim 1, characterized in that, The automotive reading light control system is also used to control the operating state of the LED light source according to the vehicle's driving status, specifically: The vehicle control module also monitors the vehicle's driving status in real time; When the vehicle collides, the control signal is abruptly switched to a low level so that the MCU control chip controls the LED light source to light up immediately based on the change trend of the control signal.

7. A car, characterized in that, include: The automotive reading light control system as described in any one of claims 1 to 6.

Images