Self-power-generation type headlamp system involving functional safety and control method of self-power-generation type headlamp system

Abstract

The invention relates to a self-power-generation type headlamp system with function safety and a control method thereof, belongs to an automobile intelligent lighting application technology, and relates to automobile lamp power generation, automobile lamp energy storage and function safety. The system comprises a vehicle lamp power supply module, a lamp circuit, an SBC module, an MCU module, a logic circuit module, a control circuit module, a voltage reduction module, a power supply storage module and a wind power charging module. In the running process of the vehicle, the vehicle lamp can be turned on through autonomous power generation of wind power, and meanwhile part of electric energy can be stored. The function safety strategy is realized under the condition that the original whole vehicle power supply end and the lamp end supply power normally, and meanwhile, the electric power stored by the power generated by the vehicle lamp is used, so that the lamp can be lightened for a certain time under the condition that an external power supply cannot be obtained, and the vehicle can be easily found by external vehicle personnel in time under an abnormal traffic accident, and the safety of the vehicle is ensured. And the safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive intelligent lighting applications, and particularly to a self-powered headlamp system involving functional safety and its control method. Background Art

[0002] With the rapid development of the automotive lighting industry, the society's requirements for the functionality of automotive lighting are getting higher and higher. Currently, in headlamp technology, the requirements for functional safety are increasing. For example, in a headlamp system, for lamps in a functionally safe state, there are generally specific lighting requirements for the low beam and position lamp functions to ensure that the vehicle can be detected in advance by the outside world in case of an accident or other abnormal conditions, avoiding accidents such as collisions.

[0003] In the prior art, especially in headlamp projects using bus communication technologies such as CAN / LIN, generally the following two solutions are adopted: ① When the bus failure state reaches a certain duration, it defaults to the functionally safe state, thereby forcibly turning on the low beam or position lamp. ② When the bus failure reaches a certain duration, the low beam or position lamp is turned on or off by judging the hardware high and low levels. However, these types of solutions are designed under the default condition that the power supply at the vehicle body power supply end and the lamp end is normal, without considering the abnormal situation of the power supply at the vehicle body power supply end and the lamp end, such as when the external power supply harness of the headlamp is completely cut off due to a car accident. At this time, the lamp loses external power supply, and the functional safety strategy cannot be realized, nor can the corresponding function be lit. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: In order to overcome the above technical problems, the present invention provides a self-powered headlamp system involving functional safety and its control method.

[0005] The technical solution adopted by the present invention to solve its technical problems is: A self-powered headlamp system involving functional safety includes a headlamp power supply module, a lamp circuit, an SBC (System Basis Chip) module, and an MCU module. The headlamp power supply module supplies power to the lamp circuit. The vehicle is equipped with a vehicle power supply, and the vehicle power supply supplies power to the headlamp power supply module. The SBC module is used to supply power to the MCU module and convert communication signals. The MCU module is used to control the lamp circuit in the normal state. The vehicle's own system communicates with the MCU module through the SBC module. The headlamp system of the present invention further includes a logic circuit module, a control circuit module, a buck module, a power storage module, and a wind power charging module.

[0006] The logic circuit module is used for signal processing, such as receiving, amplifying, shaping and converting input signals to ensure the stability and reliability of the signals, enabling the circuit to perform corresponding operations according to preset conditions and rules. For example, when the communication between the MCU module and the vehicle's own system is abnormal, the signal is converted and the lamp circuit is turned on through a hard wire.

[0007] The control circuit module is used to control the switch of the lamp circuit when the communication between the MCU module and the vehicle's own system is abnormal, and to turn on or off the lamp circuit through the control circuit.

[0008] The logic circuit module is connected to the vehicle's own system. The control circuit module is signal-connected to the vehicle's own system through the logic circuit module and communicates with the MCU module. The control circuit module and the MCU module jointly control the voltage channel switch of the lamp circuit. Here, the joint control does not mean simultaneous control, but the control circuit is controlled by the instructions of the MCU module. When the MCU does not perform control, the control circuit module controls the voltage channel switch of the lamp circuit;

[0009] The wind power charging module supplies power to the power storage module through a buck module;

[0010] The buck module is a voltage conversion circuit used to convert the electrical energy generated by the wind power charging module into regulated electrical energy; the buck module should be designed as a standard voltage conversion circuit. The electrical energy generated by the wind power charging module is unstable high-voltage electrical energy, and the function of the buck module is to convert the unstable high-voltage electrical energy generated by the wind power charging module into controllable regulated electrical energy that can be used by the lamp.

[0011] The power storage module is a battery with charge and discharge capabilities, used to store the electrical energy converted by the buck module. The power storage module should consist of a small battery with charge and discharge capabilities. While having a certain power storage capacity, it should also have the ability to supply voltage to the lamp for use, that is, voltage release ability. The power storage module supplies power to the headlight power supply module.

[0012] The wind power charging module includes a generator fan, and the generator fan is located outside the lamp structure.

[0013] The generator fan is a small wind power generator fan that converts wind energy into electrical energy by rotating rapidly during vehicle driving. Although this fan is part of the headlight structure, high-grade waterproof measures should be taken between it and the internal lamp structure of the headlight to ensure that no foreign objects can enter the headlight through the fan structure, including but not limited to rain, sand and dust.

[0014] It also includes a DC-DC module, which is used to convert the voltage of the headlight power supply module into a stable DC voltage that can be used inside the lamp circuit, being unaffected by input voltage fluctuations and load changes, and meeting the power supply requirements. Under normal circumstances, the external voltage here is actually supplied by the vehicle's own power supply; when an abnormality occurs, it can be supplied by the power storage module. The DC-DC module can have its own enable terminal and is controlled by the MCU module and the control circuit module. Under normal conditions, the voltage channel switch of the lamp circuit is controlled by the MCU module; when the communication between the MCU module and the vehicle's own system is abnormal, the voltage channel switch of the lamp circuit is controlled by the control circuit module to enable the DC-DC module to supply power to the lamp circuit and turn on the lamp circuit.

[0015] The lamp circuit includes a low beam lamp, and the low beam lamp includes a front-end Boost circuit and a low beam lamp LED circuit. The low beam lamp LED circuit includes a certain number of LEDs, and the front-end Boost circuit is used to boost the voltage in the circuit to the stable voltage value required by the low beam lamp LED circuit.

[0016] The lamp circuit also includes a position lamp, and the position lamp includes an LED driver chip and a position lamp LED circuit. The position lamp LED circuit includes a certain number of LEDs.

[0017] The LED driver chip is NSL21912.

[0018] The MCU module uses NXP S32K312. NXP S32K312 is a microcontroller launched by NXP for automotive electronics and industrial applications.

[0019] A self-powered headlight control method involving functional safety, using the self-powered headlight system involving functional safety of the present invention. Under normal vehicle functions, the vehicle power supply powers the headlight power supply module; when an abnormality occurs or the voltage of the power storage module is sufficient, the power storage module powers the headlight power supply module.

[0020] Under normal vehicle functions, the SBC module preferentially processes bus communication commands. After receiving the vehicle's light switch command, it transmits the corresponding command to the MCU module through internal communication (SPI, UART), and then the MCU module controls the switch of the lamp circuit.

[0021] When the vehicle power supply is normal, but the communication between the MCU module and the vehicle's own system is abnormal, and the SBC module supplies power to the MCU module normally, when the bus communication is abnormal, the SBC module cannot receive valid body commands, and the MCU module cannot receive the instruction signals from the SBC module. After the MCU module has not received normal instructions for a certain period of time, the MCU module controls the switching of the working mode, collects the high and low levels of the external hard wire through the logic circuit module, and then controls the voltage channel switch of the lamp circuit through the control circuit module.

[0022] When the vehicle power supply is normal, but the communication between the MCU module and the vehicle's own system is abnormal, and the MCU module fails, directly collect the high and low levels of the external hard wire through the logic circuit module, and then control the voltage channel switch of the lamp circuit through the control circuit module.

[0023] When the connection between the vehicle power supply and the headlight power supply module is disconnected, for example, in the event of a serious accident resulting in the disconnection of the connection between the headlight and the vehicle body power supply, the power storage module outputs the stored power to the headlight power supply module, and then controls the voltage channel switch of the lamp circuit through the control circuit module.

[0024] The beneficial effects of the present invention are as follows: A self-powered headlight system and its control method involving functional safety according to the present invention relate to automotive headlight power generation, headlight energy storage, and functional safety, realizing the integrated design of the power generation component and the lamp, and at the same time systematically integrating power generation, power consumption, lighting, and road functional safety, ensuring the practicability and safety of the invention. During vehicle driving, it can generate electricity autonomously through wind power to support the headlight lighting, and at the same time can store part of the electric energy. While realizing the functional safety strategy under the condition that the original vehicle power supply end and the lamp end power supply are normal, the power stored by the headlight itself is used to ensure that the lamp can remain lit for a certain period of time even when external power cannot be obtained, ensuring that the vehicle can be easily discovered by external vehicle personnel in case of an abnormal car accident, improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the drawings and embodiments.

[0026] Figure 1 It is the architecture diagram of the headlight system of the present invention.

[0027] Figure 2 It is the module flowchart for turning on the light in the normal state.

[0028] Figure 3 It is the module flowchart for turning on the light when the communication is abnormal but the MCU is normal.

[0029] Figure 4 It is the module flowchart for turning on the light when the communication is abnormal and the MCU fails.

[0030] Figure 5 It is a schematic diagram of the charge and discharge cycle. DETAILED DESCRIPTION

[0031] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0032] A self-generating headlamp system involving functional safety of the present invention comprises a headlamp power supply module, a lamp circuit, an SBC module and an MCU module. The headlamp power supply module supplies power to the lamp circuit. The whole vehicle has its own vehicle power supply, and the vehicle power supply supplies power to the headlamp power supply module. The SBC module is used to supply power to the MCU module and convert communication signals. The SBC module communicates with the vehicle's own vehicle domain controller through a bus. The MCU module is used to control the lamp circuit under normal conditions, including overall control of the lamp circuit, signal processing, channel switching, etc. The vehicle's own system communicates with the MCU module through the SBC module. The headlamp system of the present invention also comprises a logic circuit module, a control circuit module, a step-down module, a power storage module and a wind charging module.

[0033] The logic circuit module is used for signal processing, such as receiving, amplifying, shaping and converting input signals, ensuring the stability and reliability of the signal, and allowing the circuit to perform corresponding operations according to preset conditions and rules. For example, when the MCU module communicates abnormally with the vehicle's own system, the signal is converted and the lighting circuit is turned on through a hard line.

[0034] The control circuit module is used to control the lamp circuit switch when the communication between the MCU module and the vehicle's own system is abnormal, and to turn the lamp circuit on or off through the control circuit.

[0035] The logic circuit module can be connected to the vehicle's own system through a hard line, the control circuit module is connected to the vehicle's own system signal through the logic circuit module, and the control circuit module communicates with the MCU module. The control circuit module and the MCU module jointly control the voltage channel switch of the lamp circuit. The joint control here does not mean simultaneous control, but the control circuit is controlled by the MCU module instruction. When the MCU does not control, the control circuit module controls the voltage channel switch of the lamp circuit;

[0036] The wind charging module supplies power to the power storage module through the step-down module; the headlight power supply module is divided into two power supply routes, one is the vehicle power supply of the vehicle, and the other is the power storage module. Generally, the power is mainly supplied by the vehicle power supply, and at the same time, a voltage acquisition unit is set in the power storage module to collect the voltage data of the power storage module. When the voltage of the power storage module is sufficient, the vehicle power supply can be actively cut off and switched to the power storage module.

[0037] The buck module is a voltage conversion circuit used to convert the electrical energy generated by the wind power charging module into regulated electrical energy. The buck module should be designed as a standard voltage conversion circuit. The electrical energy generated by the wind power charging module is unstable high-voltage electrical energy, and the function of the buck module is to convert the unstable high-voltage electrical energy generated by the wind power charging module into controllable regulated electrical energy that can be used by the lamp.

[0038] The power storage module is a battery with charge and discharge capabilities, used to store the electrical energy converted by the buck module. The power storage module supplies power to the headlight power supply module. The power storage module should consist of a small battery with charge and discharge capabilities. While having a certain power storage capacity, it should also have the ability to supply voltage for the lamp to use, that is, voltage release ability. For example, Figure 5 under normal circumstances of the vehicle, when the power stored in the power storage module is full, the electrical energy of the power storage module can be output to the wind power charging module again to drive the fan to rotate, so as to achieve power release and avoid overcharging of the battery.

[0039] The wind power charging module includes a generator fan, and the generator fan is located outside the lamp structure. Specifically, the fan can be set on the outer side of the lamp shade outside the lamp. In order to better intake air, for the right lamp, the fan is located on the right side of the lamp, and for the left lamp, the fan is located on the left side of the lamp. A groove can be set to place the fan, and this structure should be completely isolated from the inside of the lamp to prevent water and salt spray from invading the inside of the lamp. Although this fan is part of the headlight structure, high-grade waterproof measures should be taken between it and the lamp structure inside the headlight to ensure that no foreign objects can enter the inside of the headlight through the fan structure, including but not limited to rainwater, sand and dust, etc.

[0040] Preferably, the generator fan is a small wind power generator fan, such as a small turbine fan, which converts wind energy into electrical energy by rotating rapidly during vehicle driving.

[0041] It also includes a DC-DC module, which is used to convert the voltage of the headlight power supply module into a stable DC voltage that can be used inside the lamp circuit, and is not affected by input voltage fluctuations and load changes to meet the power supply requirements. As Figure 1 shown, under normal circumstances, the external voltage here is actually supplied by the vehicle's own power supply; when an abnormality occurs, it can be supplied by the power storage module. The DC-DC module can have its own enable terminal and is controlled by the MCU module and the control circuit module. Under normal conditions, the voltage channel switch of the lamp circuit is controlled by the MCU module; when the communication between the MCU module and the vehicle's own system is abnormal, the voltage channel switch of the lamp circuit is controlled by the control circuit module to enable the DC-DC module to supply power to the lamp circuit and turn on the lamp circuit.

[0042] The lamp circuit includes a low beam lamp, which includes a front - end Boost circuit and a low - beam lamp LED circuit. The low - beam lamp LED circuit includes a certain number of LEDs, and the front - end Boost circuit is used to boost the voltage in the circuit to the stable voltage value required by the low - beam lamp LED circuit.

[0043] The lamp circuit also includes a position lamp, which includes an LED driver chip and a position - lamp LED circuit. The position - lamp LED circuit includes a certain number of LEDs.

[0044] The LED driver chip is NSL21912.

[0045] The MCU module uses NXP S32K312. NXP S32K312 is a microcontroller launched by NXP for automotive electronics and industrial applications.

[0046] A self - generating headlamp control method involving functional safety adopts the self - generating headlamp system involving functional safety described in the present invention.

[0047] When the vehicle functions normally, the SBC module preferentially processes bus communication commands. After receiving the vehicle's light - on / off instruction, it transmits the corresponding instruction to the MCU module through internal communication (SPI, UART), and then the MCU module controls the on / off of the lamp circuit; for example, Figure 2 , the MCU module enables the DC - DC module to supply power to the low - beam lamp of the lamp circuit.

[0048] When the vehicle is powered normally but the communication between the MCU module and the vehicle's own system is abnormal, and the SBC module supplies power to the MCU module normally, when the bus communication is abnormal, the SBC module cannot receive valid body commands, and the MCU module cannot receive the instruction signal from the SBC module. After the MCU module has not received a normal instruction for a certain period of time, the MCU module controls the switching of the working mode, collects the high and low levels of the external hard - wire through the logic circuit module, and then controls the voltage - channel switch of the lamp circuit through the control circuit module; for example, Figure 3 , enables the DC - DC module to supply power to the low - beam lamp of the lamp circuit.

[0049] When the vehicle is powered normally but the communication between the MCU module and the vehicle's own system is abnormal and the MCU module fails, directly collect the high and low levels of the external hard - wire through the logic circuit module, and then control the voltage - channel switch of the lamp circuit through the control circuit module; for example, Figure 4 , enables the DC - DC module to supply power to the low - beam lamp of the lamp circuit. Here, the corresponding fault - detection unit can detect in real time and feedback the fault signal to the MCU module, and then judge whether to activate the logic circuit module and the control circuit module.

[0050] When the connection between the vehicle power supply and the headlight power supply module is disconnected, for example, in the event of a serious accident that causes the disconnection between the headlight and the vehicle body power supply, the power storage module should immediately output the stored power to the headlight power supply module, and then control the voltage channel switch of the lamp circuit through the control circuit module. For example Figure 1 , enable the DC-DC module to supply power to the low beam of the lamp circuit. Here, the power supply status of the headlight power supply module can be judged by voltage detection. If the vehicle power supply is abnormally missing, the power storage module is started to supply power to the headlight power supply module.

[0051] Inspired by the above ideal embodiments according to the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A self-powered headlamp system related to functional safety, comprising a vehicle lamp power supply module, a lamp circuit, an SBC module and an MCU module. The vehicle lamp power supply module supplies power to the lamp circuit. The vehicle is equipped with a vehicle power supply, and the vehicle power supply supplies power to the vehicle lamp power supply module. The SBC module is used to supply power to the MCU module and convert communication signals. The MCU module is used to control the lamp circuit under normal conditions. The vehicle's own system communicates with the MCU module through the SBC module. It is characterized in that, It also includes a logic circuit module, a control circuit module, a buck module, a power storage module, and a wind power charging module; The logic circuit module is used for signal processing. The control circuit module is used to control the on / off of the lamp circuit when the communication between the MCU module and the vehicle's own system is abnormal. The logic circuit module is connected to the vehicle's own system, and the control circuit module is signal-connected to the vehicle's own system through the logic circuit module. The control circuit module communicates with the MCU module, and the control circuit module and the MCU module jointly control the voltage channel switch of the lamp circuit; The wind power charging module supplies power to the power storage module through the buck module; The buck module is a voltage conversion circuit, which is used to convert the electric energy generated by the wind power charging module into regulated electric energy; The power storage module is a battery with charge and discharge capabilities, which is used to store the electric energy converted by the buck module, and the power storage module supplies power to the headlight power supply module; 2. The self-powered headlamp system related to functional safety according to claim 1, wherein The wind power charging module includes a generator fan, and the generator fan is located outside the lamp structure.

3. The self-powered headlamp system related to functional safety according to claim 2, characterized in that, The generator fan is a small wind power generator fan.

4. The self-powered headlamp system related to functional safety according to claim 1, characterized in that, It also includes a DC-DC module, which is used to convert the voltage of the headlight power supply module into a stable DC voltage that can be used inside the lamp circuit; 5. The self-powered headlamp system related to functional safety according to claim 1, characterized in that, The lamp circuit includes a low beam lamp, and the low beam lamp includes a front-end Boost circuit and a low beam lamp LED circuit. The low beam lamp LED circuit includes a certain number of LEDs. The front-end Boost circuit is used to boost the voltage in the circuit to the stable voltage value required by the low beam lamp LED circuit; 6. The self-powered headlamp system related to functional safety according to claim 5, characterized in that, The lamp circuit also includes a position lamp, and the position lamp includes an LED driver chip and a position lamp LED circuit. The position lamp LED circuit includes a certain number of LEDs.

7. The self-powered headlamp system related to functional safety according to claim 6, characterized in that, The LED driver chip is NSL21912.

8. The self-powered headlamp system related to functional safety according to claim 1, wherein The MCU module uses NXP S32K312.

9. A self-powered headlamp control method involving functional safety, characterized in that, Adopt the self-powered headlight system involving functional safety as described in any one of claims 1-8. Under normal vehicle functions, the vehicle power supply powers the headlight power supply module; when an abnormality occurs or the voltage of the power storage module is sufficient, the power storage module powers the headlight power supply module.

10. The self-powered headlamp control method related to functional safety according to claim 9, characterized in that, Under normal vehicle functions, the SBC module preferentially processes bus communication commands. After receiving the vehicle's light on / off command, it transmits the corresponding command to the MCU module through internal communication, and then the MCU module controls the on / off of the lamp circuit; When the vehicle power supply is normal but the communication between the MCU module and the vehicle's own system is abnormal and the SBC module normally powers the MCU module, after the MCU module has not received a normal command for a certain period of time, the MCU module controls the switching of the working mode, collects the high and low levels of the external hard wire through the logic circuit module, and then controls the voltage channel switch of the lamp circuit through the control circuit module; When the vehicle power supply is normal but the communication between the MCU module and the vehicle's own system is abnormal and the MCU module fails, directly collect the high and low levels of the external hard wire through the logic circuit module, and then control the voltage channel switch of the lamp circuit through the control circuit module; When the connection between the vehicle power supply and the headlight power supply module is disconnected, the power storage module outputs the stored power to the headlight power supply module, and then controls the voltage channel switch of the lamp circuit through the control circuit module.

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