A lighting controller-based lamp end angle adjustment control system and method

Abstract

The present invention relates to the field of automotive lamp end control technology, and discloses a lamp end angle adjustment control system and method based on a light controller, comprising a vehicle body domain controller and a light controller, wherein the input end of the light controller is connected to the vehicle body domain controller via a CAN or LIN bus, and the output end is connected to the lamp end via a hard line. The light controller is used to receive and parse motor gear adjustment information transmitted by the vehicle body domain controller, converting the PWM signal into a voltage signal within the lamp to adjust the lighting angle of the vehicle lamp. The light controller designed in the present invention can parse the message signal into a PWM duty cycle, and then convert it into an analog voltage through a DAC, which is used as an adjustment signal for the left and right headlight motors to achieve combined switch control of the lamp end. The motor signal control is integrated into the light controller end to achieve the dynamic effect of unlocking the entire vehicle lights and music light shows, effectively avoiding the inconsistency caused by the time delay between the left and right lamps.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile lamp end control, and in particular to a lamp end angle adjustment control system and method based on a light controller. Background Art

[0002] With the development of intelligent automotive lighting, the functions of lamp adjustment are integrated into the central control screen to form virtual buttons. Figure 1 This type of lighting system control typically requires separate DAC circuits within the left and right lamp drivers to adjust the headlight height motor. This increases the design cost of the headlight driver and leads to an overly cumbersome headlight design. Summary of the Invention

[0003] In response to the shortcomings of the existing technology, the technical solution adopted by the present invention to solve its technical problems is: a lamp end angle adjustment control system based on a light controller, including a body domain controller and a light controller, the input end of the light controller is connected to the body domain controller via a CAN or LIN bus, and the output end is connected to the lamp end via a hard line. The light controller is used to receive and analyze the motor gear adjustment information transmitted by the body domain controller, and convert the PWM signal into a voltage signal inside the lamp to adjust the lighting angle of the headlight.

[0004] Preferably, the lamp end includes a left headlight and a right headlight, and the left headlight and the right headlight each include a DC motor and at least one LED light source.

[0005] Preferably, the lighting controller includes a system basis chip SBC, a microcontroller MCU, a DAC circuit, an ADC circuit and a high-side switch HSS. The system basis chip SBC and the high-side switch HSS are both connected to the microcontroller MCU. The ADC end of the microcontroller MCU is respectively connected to the high-side switch and the DC motor through the ADC circuit. The PWM end and EN end of the microcontroller MCU are both connected to the DC motor through the DAC circuit.

[0006] Preferably, the DAC circuit includes a resistor R1, a resistor R8, a resistor R9, a transistor Q1, a transistor Q2, a transistor Q3 and a transistor Q4, wherein the first end of the resistor R1 is used to input a PWM signal, the second end of the resistor R1 is connected to the base of the transistor Q1, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected in parallel with a resistor R2 and a resistor R5, the other end of the resistor R2 is connected to the collector of the transistor Q4, the other end of the resistor R5 is connected to the base of the transistor Q2, and the Resistors R3, R4, and R7 are connected in parallel to the collector of the transistor Q2. The emitter of the transistor Q2 is grounded. The other end of the resistor R7 is connected to the first end of the resistor R8. The second end of the resistor R8 is used to output a voltage signal. The base of the transistor Q4 is connected to a resistor R11. The other end of the resistor R11 is connected to the collector of the transistor Q3. The first end of the resistor R9 is used to input an EN signal. The second end of the resistor R9 is connected to the base of the transistor Q3. The emitter of the transistor Q3 is grounded.

[0007] Preferably, a resistor R2 is connected in series between the second end of the resistor R1 and the emitter of the transistor Q1, a resistor R10 is connected in series between the second end of the resistor R9 and the emitter of the transistor Q3, a resistor R12 is connected in series between one end of the resistor R11 and the emitter of the transistor Q4, and a resistor R6 is connected in series between the other end of the resistor R5 and the emitter of the transistor Q2.

[0008] Preferably, a capacitor C1 is connected in series between the resistor R7 and the resistor R8, and a capacitor C2 is connected in series between the resistor R8 and the voltage signal output, and the other ends of the capacitor C1 and the capacitor C2 are both grounded.

[0009] Preferably, the equivalent resistance values ​​of the resistors R3 and R4 are much smaller than the equivalent resistance values ​​of the resistors R7 and R8.

[0010] Preferably, the high side switch HSS is provided with a plurality of switch channels, the number of which depends on the function and type of the lamp end. One end of the LED light source is connected to the switch channel, and the other end is grounded.

[0011] Preferably, a switch and a filter are provided between the system basis chip SBC and the high-side switch.

[0012] The present invention also discloses a method for controlling the angle adjustment of a lamp end based on a light controller, comprising the following steps:

[0013] S1, the lighting controller supplies power to the loads of various functions at the lighting end through the high-side switch HSS, and provides the required diagnostic functions for the loads;

[0014] S2. Before sending a signal to adjust the headlight height motor, the DAC enable signal is turned on. The PWM port of the microcontroller (MCU) generates the correct PWM duty cycle (D). The PWM-to-analog voltage hardware driver circuit generates a signal voltage value. The MCU reads the signal voltage and the ADC value of the power supply voltage, combined with the external Hall effect sensor, to determine whether the motor is correctly adjusted to the corresponding angle.

[0015] S3. The lighting controller provides a DC voltage signal for adjusting the height of the headlights of the lamp and sends it to the signal port of the DC motor through a hard line. The DC motor then adjusts the height of the headlights according to the ratio of the signal voltage to the supply voltage.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The lighting controller designed in this invention can parse the message signal into a PWM duty cycle, and then convert it into an analog voltage through a DAC, which is used as an adjustment signal for the left and right headlight motors to achieve combined switch control on the lamp end. In addition, the motor signal control is integrated into the lighting controller end, and the adjustment of the headlight angle can be integrated into the unlocking and music show scenes. The adjustment of the motor height and the dynamic changes of the lights cooperate with each other to enrich the dynamic effect, so as to achieve the dynamic effects of vehicle lighting unlocking and music light show, and effectively avoid the inconsistency caused by the time delay between the left and right lamps.

[0018] 2. The present invention controls the lamps through high-side control, requiring only network management and static current control of the lighting controller. This simplifies the design of the left and right headlight sub-node systems while also simplifying the design of software and hardware.

[0019] 3. The present invention uses intelligent electronic switches to control lamps, which reduces the noise generated when adjusting vehicle lamps while extending the life of the control method, and is more conducive to the lightweight, miniaturization and platform development of vehicle body ECUs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural block diagram of the present invention;

[0021] Figure 2 This is the functional block diagram of the lighting controller;

[0022] Figure 3 This is a schematic diagram of the DAC circuit;

[0023] Figure 4 This is the output waveform of the voltage when the PWM duty cycle D = 20.1%;

[0024] Figure 5 This is the output waveform of the voltage when the PWM duty cycle D = 36%;

[0025] Figure 6This is the output waveform of the voltage when the PWM duty cycle D = 45.3%;

[0026] Figure 7 This is the output waveform of the voltage when the PWM duty cycle D = 58%;

[0027] Figure 8 It is a view of the front lights of a car. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0029] like Figure 1-2 As shown, a lamp angle adjustment control system based on a light controller includes a body domain controller and a light controller, wherein the light controller is powered by KL30 and KL31, and its input end is connected to the body domain controller via a CAN or LIN bus, and its output end is connected to the lamp end via a hard line. The light controller is awakened by a message, controls the power supply and static current of each function of the lamp, and provides power and diagnosis for the lamp, including the fan for module heat dissipation or the motor for adjusting the lamp up, down, left and right. There is no direct communication between the lamp and the body end. The lamp end is driven by a hard-wired controller and can be driven by an MCU, simplifying the design of the drive inside the lamp; the lamp end includes a left headlight and a right headlight, both of which include a DC motor and at least one LED light source; the light controller is used to receive and parse the motor gear adjustment information transmitted by the body domain controller, and convert the PWM signal into a voltage signal inside the lamp to adjust the lighting angle of the headlight.

[0030] The lighting controller includes a system basis chip (SBC), a microcontroller (MCU), a DAC circuit, an ADC circuit, and a high-side switch (HSS). The system basis chip (SBC) and the high-side switch (HSS) are both connected to the microcontroller (MCU). The ADC end of the microcontroller (MCU) is connected to the high-side switch and the DC motor respectively through the ADC circuit. The PWM end and the EN end of the microcontroller (MCU) are both connected to the DC motor through the DAC circuit. The high-side switch (HSS) is equipped with several switch channels, and the number of switch channels depends on the function and type of the lamp. One end of the LED light source is connected to the switch channel, and the other end is grounded. A switch and a filter are provided between the system basis chip (SBC) and the high-side switch. The lighting controller supplies power to the loads of various functions at the lamp end through the high-side switch, and provides the required diagnostic functions for the loads, provides a DC voltage signal for adjusting the height of the headlights to the DC motor, and detects faults at the lamp end through hard lines and sends fault information to the vehicle body; the functions included in the lamp end (front lamp part including left and right high beams, left and right low beams, left and right turn signals, left and right daytime running lights, left and right position lights, etc.; rear lamp part including left and right brake lights, left and right turn signals, left and right position lights; wheel eyebrow lights; logo lights, etc.) can all be powered and diagnosed by the lighting controller. The diagnosis needs to be decided by the OEM according to regulatory requirements whether additional diagnosis is needed. Generally, for passenger cars, the front and rear steering It is necessary to diagnose the failure of the lights. Once the turn signal fails, timely feedback must be given to the driver. If there are higher requirements for functional safety, the FTTI time and functional safety goals and status must also be met. The diagnosis of which lamps are carried by the car controller of this system is generally determined by the OEM according to the lamps that need to participate in the vehicle unlocking or music show; all light switch controls, light unlocking or music show dynamic effects, and advanced light functions (mainly including headlight height motors, follow-up steering motors, module active cooling fans, etc.) can be concentrated in the light controller for processing, which is a more friendly division of responsibilities in the body domain, and the design of the headlight drive can be simplified.

[0031] The lighting controller lights up the various functions of the lamps by switching the high side at different timings. After the combination switch, the vehicle's welcoming dynamic effect and music show effect can be realized. It can also realize the effects of flowing water at the lamp end (lighting up in the order of numbers 1-12) by designing the timing of switching different function lights according to the location of the external lamp installation. Figure 8 As shown;

[0032] There are physical buttons on the vehicle body or soft buttons on the central control screen to adjust the headlight height, as shown in the following table (motor signal voltage to power supply voltage ratio, gear position):

[0033] gear Motor signal line voltage Motor high-side supply voltage percentage Level 0 8v±5％ 13.9v 58.00％ Level 1 6.3v±5％ 13.9v 45.30％ Level 2 5v±5％ 13.9v 36.00％ Level 3 2.8v±5％ 13.9v 20.10％

[0034] The gear information in the figure varies according to the requirements of each OEM. Different motor extension lengths and structural assemblies can achieve headlight height angle adjustment. In actual vehicle debugging, calibration must also be performed according to the actual vehicle lighting requirements. These gear parameters are used as parameters for motor input signal height adjustment. The controller determines the PWM duty cycle of the motor output signal based on the gear information input in the message. This duty cycle is also the percentage of the motor signal voltage to the power supply voltage.

[0035] like Figure 3 As shown, the DAC circuit includes a resistor R1, a resistor R8, a resistor R9, a transistor Q1, a transistor Q2, a transistor Q3 and a transistor Q4, a first end of the resistor R1 for inputting a PWM signal, a second end of the resistor R1 connected to the base of the transistor Q1, the emitter of the transistor Q1 is grounded, a resistor R2 and a resistor R5 are connected in parallel to the collector of the transistor Q1, the other end of the resistor R2 is connected to the collector of the transistor Q4, the other end of the resistor R5 is connected to the base of the transistor Q2, a resistor R3, a resistor R4 and a resistor R7 are connected in parallel to the collector of the transistor Q2, the emitter of the transistor Q2 is grounded, the other end of the resistor R7 is connected to the first end of the resistor R8, the second end of the resistor R8 is used for outputting a voltage signal, the base of the transistor Q4 is grounded. A resistor R11 is connected to the base of the transistor Q3, the other end of the resistor R11 is connected to the collector of the transistor Q3, a first end of the resistor R9 is used to input an EN signal, a second end of the resistor R9 is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, a resistor R2 is connected in series between the second end of the resistor R1 and the emitter of the transistor Q1, a resistor R10 is connected in series between the second end of the resistor R9 and the emitter of the transistor Q3, a resistor R12 is connected in series between one end of the resistor R11 and the emitter of the transistor Q4, a resistor R6 is connected in series between the other end of the resistor R5 and the emitter of the transistor Q2, a capacitor C1 is connected in series between the resistors R7 and R8, a capacitor C2 is connected in series between the resistor R8 and the voltage signal output, and the other ends of the capacitors C1 and C2 are both grounded.

[0036] The DAC circuit with enable control is used to convert the bit information of the report file input from the vehicle body domain into the analog voltage gear value of the DC motor; the power supply voltage of the height motor in the circuit diagram is the same as the power supply of the low-beam high-side switch, which is represented by a DC constant voltage source in the figure; when adjusting the motor, the GPIO port of the microcontroller MC outputs a high level to turn on the enable transistor Q3 and make its transistor Q4 saturated and turned on. The voltage of VCC is almost the same as the power supply voltage of the height adjustment motor; the PWM port of the microcontroller MCU inside the controller sends a signal with a duty cycle of D, which is passed The resistors R1 and R2 can make the transistor Q1 saturated and turned on, and a PWM waveform opposite to the signal is obtained at the collector. Through the secondary conversion of resistors R5, R6 and transistor Q2, a waveform similar to the initial PWM is obtained at the collector of transistor Q2, but the amplitude will be larger and close to the motor power supply voltage. Using the RC charging and discharging principle, an analog voltage value is obtained by integrating the resistor R7 and capacitor C1, and the resistor R8 and capacitor C2. This voltage value is approximately D*VCC. The time constant of the integral RC must be greater than 10 times the PWM waveform width. Figure 4-7 As shown, adjust the parameters according to the gear information input by the OEM:

[0037] When the PWM duty cycle D = 20.1% and the high-side supply voltage is 13.9V, the analog voltage value obtained is 2.8V;

[0038] When the PWM duty cycle D = 36% and the high-side supply voltage is 13.9V, the analog voltage value obtained is 6V;

[0039] When the PWM duty cycle D = 45.3% and the high-side supply voltage is 13.9V, the analog voltage value obtained is 6.3V;

[0040] When the PWM duty cycle D=58% and the high-side power supply voltage is 13.9V, the analog voltage value obtained is 8V.

[0041] The equivalent resistance values ​​of resistors R3 and R4 are much smaller than the equivalent resistance values ​​of resistors R7 and R8. Otherwise, the resistance values ​​of resistors R3 and R4 affect the output integral voltage. When simulating the circuit, R3 and R4 are set to 2k. When the VCC voltage is relatively high, Q2 is saturated and turned on. At this time, the power that R3 and R4 need to bear is relatively large. Two resistors are needed here to share the power.

[0042] A method for adjusting the angle of a lamp end based on a lighting controller comprises the following steps:

[0043] S1, the lighting controller supplies power to the loads of various functions at the lighting end through the high-side switch HSS, and provides the required diagnostic functions for the loads;

[0044] S2. Before sending a signal to adjust the headlight height motor, the DAC enable signal is first turned on. The PWM port of the microcontroller (MCU) generates a correct PWM signal. The PWM-to-analog voltage hardware driver circuit generates a signal voltage value. The microcontroller (MCU) reads the signal voltage and the ADC value of the power supply voltage, combined with the external Hall effect sensor, to determine whether the motor is correctly adjusted to the corresponding angle.

[0045] S3. The lighting controller provides a DC voltage signal for adjusting the height of the headlights of the lamp and sends it to the signal port of the DC motor through a hard line. The DC motor then adjusts the height of the headlights according to the ratio of the signal voltage to the supply voltage.

[0046] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without making creative efforts should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention shall be implemented in accordance with conventional means in the field unless otherwise specified or limited.

Claims

1. A lighting controller-based lamp end angle adjustment control system, comprising a vehicle body domain controller and a lighting controller, characterized in that: The input end of the light controller is connected to the vehicle body domain controller via a CAN or LIN bus, and the output end is connected to the lamp end via a hard line. The light controller is used to receive and analyze the motor gear adjustment information transmitted by the vehicle body domain controller, and convert the PWM signal into a voltage signal in the lamp to adjust the lighting angle of the lamp; The lamp end includes a left headlight and a right headlight, and the left headlight and the right headlight each include a DC motor and at least one LED light source; The lighting controller includes a system basis chip (SBC), a microcontroller (MCU), a DAC circuit, an ADC circuit, and a high-side switch (HSS). The system basis chip (SBC) and the high-side switch (HSS) are both connected to the microcontroller (MCU). The ADC terminal of the microcontroller (MCU) is respectively connected to the high-side switch and the DC motor via the ADC circuit. The PWM terminal and the EN terminal of the microcontroller (MCU) are both connected to the DC motor via the DAC circuit. The DAC circuit includes a resistor R1, a resistor R8, a resistor R9, a transistor Q1, a transistor Q2, a transistor Q3 and a transistor Q4. The first end of the resistor R1 is used to input a PWM signal. The second end of the resistor R1 is connected to the base of the transistor Q1. The emitter of the transistor Q1 is grounded. The collector of the transistor Q1 is connected in parallel with resistors R2 and R5. The other end of the resistor R2 is connected to the collector of the transistor Q4. The other end of the resistor R5 is connected to the base of the transistor Q2. Resistors R3, R4, and R7 are connected in parallel to the collector of transistor Q2. The emitter of transistor Q2 is grounded. The other end of resistor R7 is connected to a first end of resistor R8. The second end of resistor R8 is used for outputting a voltage signal. The base of transistor Q4 is connected to resistor R11. The other end of resistor R11 is connected to the collector of transistor Q3. The first end of resistor R9 is used for inputting an EN signal. The second end of resistor R9 is connected to the base of transistor Q3. The emitter of transistor Q3 is grounded.

2. The lamp end angle adjustment control system based on a light controller according to claim 1, characterized in that: A resistor R2 is connected in series between the second end of the resistor R1 and the emitter of the transistor Q1, a resistor R10 is connected in series between the second end of the resistor R9 and the emitter of the transistor Q3, a resistor R12 is connected in series between one end of the resistor R11 and the emitter of the transistor Q4, and a resistor R6 is connected in series between the other end of the resistor R5 and the emitter of the transistor Q2.

3. The lamp end angle adjustment control system based on a light controller according to claim 1, characterized in that: A capacitor C1 is connected in series between the resistor R7 and the resistor R8 , and a capacitor C2 is connected in series between the resistor R8 and the voltage signal output. The other ends of the capacitor C1 and the capacitor C2 are both grounded.

4. The lamp end angle adjustment control system based on a light controller according to claim 1, characterized in that: The equivalent resistance values ​​of the resistors R3 and R4 are smaller than the equivalent resistance values ​​of the resistors R7 and R8.

5. The lamp end angle adjustment control system based on a light controller according to claim 1, characterized in that: The high side switch HSS is provided with a plurality of switch channels, the number of which depends on the function and type of the lamp end. One end of the LED light source is connected to the switch channel, and the other end is grounded.

6. The lamp end angle adjustment control system based on a light controller according to claim 1, characterized in that: A switch and a filter are provided between the system basis chip SBC and the high-side switch.

7. A control method for a lamp end angle adjustment control system based on a lighting controller according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, the lighting controller supplies power to the loads of various functions at the lighting end through the high-side switch HSS, and provides the required diagnostic functions for the loads; S2. Before sending a signal to adjust the headlight height motor, the DAC enable signal is first turned on. The PWM port of the microcontroller (MCU) generates a correct PWM signal. The PWM-to-analog voltage hardware driver circuit generates a signal voltage value. The microcontroller (MCU) reads the signal voltage and the ADC value of the power supply voltage, combined with the external Hall effect sensor, to determine whether the motor is correctly adjusted to the corresponding angle. S3. The lighting controller provides a DC voltage signal for adjusting the height of the headlights and sends it to the signal port of the DC motor through a hard line. The DC motor then adjusts the height of the headlights according to the ratio of the signal voltage to the supply voltage.

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