Adaptive adjustment method and device for brightness and light zone of ADB headlamp
阅读说明：本技术 Adb大灯亮度和光区自适应调节方法及装置 (Adaptive adjustment method and device for brightness and light zone of ADB headlamp ) 是由 郭彪 曹海红 周胜 张文成 于 2021-09-17 设计创作，主要内容包括：本发明公开了一种ADB大灯亮度和光区自适应调节方法及装置,属于汽车电子控制技术领域。本发明的ADB大灯亮度和光区自适应调节方法在ADB激活时,先点亮中心光区,再往两侧依次点亮其他光区,使各个分区叠加环境光后光照强度基本保持一致；若某个光区处于关闭状态,则跳过该光区,点亮下一个处于开启状态的光区,并进行不同环境光下亮度的自适应调节,可以有效解决ADB光叠加不同环境光后照度不一致的问题。此外,本发明的ADB大灯亮度和光区自适应调节装置还给出了一种ADB激活和退出的判定条件,可以有效解决远光突然开启或关闭,亮度突然变化的问题。(The invention discloses an adaptive adjustment method and device for brightness and a light zone of an ADB headlamp, and belongs to the technical field of automobile electronic control. When the ADB is activated, the ADB headlamp brightness and light area self-adaptive adjusting method firstly lights the central light area and then sequentially lights other light areas to the two sides, so that the illumination intensity is basically consistent after each subarea is superposed with ambient light; if a certain light zone is in a closed state, the light zone is skipped, the next light zone in an open state is lightened, and adaptive adjustment of brightness under different ambient lights is performed, so that the problem of inconsistent illumination after ADB light is superposed with different ambient lights can be effectively solved. In addition, the ADB headlamp brightness and light area adaptive adjusting device also provides a judgment condition for ADB activation and exit, and can effectively solve the problems that the high beam is suddenly turned on or off and the brightness is suddenly changed.)
1. An ADB headlamp brightness and light area self-adaptive adjusting method is characterized by comprising the following steps:
the partitions of the ADB headlamp sequentially comprise … … L2 ', L1L2, L1 ', OL1, O ', OR1, R1 ', R1R2 and R2 ' … … from left to right; wherein: … … L2, L1, O, R1 and R2 … … are light regions of the ADB headlamp in sequence, … … L1L2, OL1, OR1 and R1R2 … … are overlapped regions between two adjacent light regions of the ADB headlamp in sequence, … … L2 ', L1 ', O ', R1 ' and R2 ' … … are residual regions of the light regions of the ADB headlamp except the overlapped regions;
in a darkroom, acquiring a light intensity distribution diagram of each light area of the ADB headlamp, and determining an illumination curve of each light area according to the light intensity distribution diagram;
when the ADB is activated, the central light area is lightened firstly, and then other light areas are lightened sequentially towards two sides, so that the illumination intensity is basically consistent after each subarea is superposed with the ambient light; if a certain light zone is in a closed state, skipping the light zone, and lightening the next light zone in an open state;
the method comprises the following specific steps:
s1, when the ADB is activated, firstly judging whether the central light area O is opened or not; if the light area O is opened, calculating to obtain a current PWM value of the light area O by combining the illuminance of the ambient light, the preset target illuminance and the illuminance curve of the light area O, so that the illuminance of the subarea O' reaches the target illuminance; if the light zone O is off, go to step S4;
s2, judging whether an adjacent light zone L1 on the left side of the light zone O is opened or not; if the light zone L1 is opened, calculating to obtain a current PWM value of the light zone L1 by combining the illuminance of ambient light, a preset target illuminance, the illuminance provided by the light zone O to the subarea OL1 and an illuminance curve of the light zone L1, so that the illuminance of the subarea OL1 reaches the target illuminance; if the light zone L1 is off, perform step S4;
s3, whether the adjacent light zone L2 on the left side of the light zone L1 is opened is judged; if the light zone L2 is opened, calculating the current PWM value of the light zone L2 by the same method as that when the light zone L1 is opened, so that the illumination of the subarea L1L2 reaches the target illumination; by analogy, continuously judging the adjacent light area on the left side until all the light areas on the left side are calculated; if the light zone L2 is off, perform step S4;
s4, if a certain light zone is closed, judging whether an adjacent light zone on the left side of the light zone is opened; if the adjacent light area on the left side of the light area is opened, calculating the current PWM value of the adjacent light area on the left side of the light area by the same method as that when the light area O is opened; if the adjacent light zone on the left side of the light zone is turned off, performing step S4;
the control method of the right light area is consistent with that of the left light area.
2. The ADB headlight luminance and dimming adaptive adjustment method according to claim 1, wherein determining an illuminance curve of a single dimming zone comprises:
let the central light intensity of the light zone be Y0Light intensity of point A at the edge of the light zone is YALight intensity at the center of the edge of the optical region is YA/2And fitting an illuminance quadratic curve of a single light zone according to the center, the center-dividing point, the edge position and the corresponding light intensity of the light zone:
Y＝2(YA+Y0-2YA/2)/A2*X2+(4YA/2-3Y0-YA)/A*X+Y0，X∈(-A，A)。
3. the ADB headlamp luminance and light zone adaptive adjustment method of claim 1, wherein calculating a current PWM value of a light zone O by combining an illuminance of ambient light, a preset target illuminance, and an illuminance curve of the light zone O so that an illuminance of a zone O' reaches the target illuminance comprises:
subtracting the illumination of the ambient light from the preset target illumination to obtain the required illumination;
adjusting the current PWM value of the optical area O to enable the average value of the illumination of the subarea O 'or the illumination of a certain point in the subarea O' to reach the required illumination; at this time, the current PWM value of the optical area O is the current PWM value of the optical area O.
4. The ADB headlamp luminance and dimming adaptive adjustment method of claim 1, wherein calculating a current PWM value of the dimming zone L1 in combination with the illuminance of the ambient light, the preset target illuminance, the illuminance of the dimming zone O provided to the segment OL1, and the illuminance curve of the dimming zone L1 so that the illuminance of the segment OL1 reaches the target illuminance comprises:
subtracting the illuminance of the ambient light from the preset target illuminance, and subtracting the illuminance provided by the optical area O to the subarea OL1 to obtain the required illuminance;
adjusting the current PWM value of the light zone L1 to make the average value of the illuminance of the subarea OL1 or the illuminance of a certain point in the subarea O' reach the required illuminance; at this time, the current PWM value of the light region L1 is the current PWM value of the light region L1.
5. An ADB headlamp luminance and dimming adaptive adjusting apparatus for implementing the ADB headlamp luminance and dimming adaptive adjusting method of any one of claims 1 to 4, comprising: the device comprises a camera, an illumination sensor, an ESC, a high beam and low beam switch, an ADB automatic switch, an ADB functional module and a left LED matrix lamp and a right LED matrix lamp;
the camera is used for acquiring vehicle obstacle information and further determining the opening and closing of each light area according to the vehicle obstacle information;
the illumination sensor is used for acquiring the illumination of ambient light;
the ESC is used for acquiring vehicle speed information;
the far and near light switch and the ADB automatic switch are used for acquiring the states of the far and near light switch and the ADB automatic switch;
and the ADB functional module controls the on and off of the left and right LED matrix lamps and the brightness adjustment according to the acquired vehicle obstacle information, the illuminance of ambient light, the vehicle speed information, the far and near light switch and the state of the ADB automatic switch.
6. An ADB headlight brightness and dimming adaptive adjusting device according to claim 5, wherein the light sensor is a solar-rain sensor.
7. An ADB headlamp luminance and dimming adaptive adjustment device according to claim 5, further comprising an IBCM, wherein the ADB function module is integrated in the IBCM.
8. An ADB headlight brightness and dimming adaptive adjustment device according to claim 5, characterized in that the ADB is activated when the following conditions are simultaneously fulfilled: firstly, an ADB automatic switch is in an AUTO gear, secondly, a dipped headlight is in a lighting state, a high beam switch is turned on, thirdly, the vehicle speed is greater than V1, and fourthly, the ambient light intensity is less than Q1.
9. An ADB headlamp luminance and dimming adaptive adjustment device according to claim 6, wherein the ADB exits when one of the following conditions is satisfied: firstly, an ADB automatic switch is in a non-AUTO gear, secondly, a dipped headlight is in an off state or a high beam switch is turned off, thirdly, the vehicle speed is less than V2, wherein V2 is less than V1, fourthly, the ambient light intensity is greater than Q2, and Q2 is greater than Q1.
Technical Field
The invention belongs to the technical field of automobile electronic control, and particularly relates to an adaptive adjustment method and device for brightness and light zone of an ADB headlamp.
Background
More and more SUV motorcycle type and part high-end car begin to dispose ADB (matrix) headlight system, as the upgrading of traditional car headlight, the ADB headlight has promoted user's convenience, has improved the science and technology of vehicle and has felt. The current ADB headlight can automatically turn on and off the light area according to the information of the obstacle.
However, a vehicle equipped with an ADB headlamp has two problems: (1) aiming at different ambient light, the brightness of the light irradiated by the ADB is consistent, and after the ambient light is superposed, the illuminance of the light under different scenes is inconsistent; (2) there are cases where the high beam is suddenly turned on or off and the brightness changes suddenly.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides an ADB headlamp brightness and light area self-adaptive adjusting method and device, which are used for solving the problem that the illuminance is inconsistent after ADB light is superposed with different ambient light.
In order to achieve the purpose, the invention provides an adaptive adjustment method for brightness and light zone of an ADB headlamp, which comprises the following steps:
the partitions of the ADB headlamp sequentially comprise … … L2 ', L1L2, L1 ', OL1, O ', OR1, R1 ', R1R2 and R2 ' … … from left to right; wherein: … … L2, L1, O, R1 and R2 … … are light regions of the ADB headlamp in sequence, … … L1L2, OL1, OR1 and R1R2 … … are overlapped regions between two adjacent light regions of the ADB headlamp in sequence, … … L2 ', L1 ', O ', R1 ' and R2 ' … … are residual regions of the light regions of the ADB headlamp except the overlapped regions;
in a darkroom, acquiring a light intensity distribution diagram of each light area of the ADB headlamp, and determining an illumination curve of each light area according to the light intensity distribution diagram;
when the ADB is activated, the central light area is lightened firstly, and then other light areas are lightened sequentially towards two sides, so that the illumination intensity is basically consistent after each subarea is superposed with the ambient light; if a certain light zone is in a closed state, skipping the light zone, and lightening the next light zone in an open state;
the method comprises the following specific steps:
s1, when the ADB is activated, firstly judging whether the central light area O is opened or not; if the light area O is opened, calculating to obtain a current PWM value of the light area O by combining the illuminance of the ambient light, the preset target illuminance and the illuminance curve of the light area O, so that the illuminance of the subarea O' reaches the target illuminance; if the light zone O is off, go to step S4;
s2, judging whether an adjacent light zone L1 on the left side of the light zone O is opened or not; if the light zone L1 is opened, calculating to obtain a current PWM value of the light zone L1 by combining the illuminance of ambient light, a preset target illuminance, the illuminance provided by the light zone O to the subarea OL1 and an illuminance curve of the light zone L1, so that the illuminance of the subarea OL1 reaches the target illuminance; if the light zone L1 is off, perform step S4;
s3, whether the adjacent light zone L2 on the left side of the light zone L1 is opened is judged; if the light zone L2 is opened, calculating the current PWM value of the light zone L2 by the same method as that when the light zone L1 is opened, so that the illumination of the subarea L1L2 reaches the target illumination; by analogy, continuously judging the adjacent light area on the left side until all the light areas on the left side are calculated; if the light zone L2 is off, perform step S4;
s4, if a certain light zone is closed, judging whether an adjacent light zone on the left side of the light zone is opened; if the adjacent light area on the left side of the light area is opened, calculating the current PWM value of the adjacent light area on the left side of the light area by the same method as that when the light area O is opened; if the adjacent light zone on the left side of the light zone is turned off, performing step S4;
the control method of the right light area is consistent with that of the left light area.
Further, determining the illuminance curve of a single light zone comprises:
let the central light intensity of the light zone be Y0Light intensity of point A at the edge of the light zone is YALight intensity at the center of the edge of the optical region is YA/2And fitting an illuminance quadratic curve of a single light zone according to the center, the center-dividing point, the edge position and the corresponding light intensity of the light zone:
Y＝2(YA+Y0-2YA/2)/A2*X2+(4YA/2-3Y0-YA)/A*X+Y0，X∈(-A，A)。
further, calculating a current PWM value of the optical area O by combining the illuminance of the ambient light, the preset target illuminance, and the illuminance curve of the optical area O, so that the illuminance of the partition O' reaches the target illuminance includes:
subtracting the illumination of the ambient light from the preset target illumination to obtain the required illumination;
adjusting the current PWM value of the optical area O to enable the average value of the illumination of the subarea O 'or the illumination of a certain point in the subarea O' to reach the required illumination; at this time, the current PWM value of the optical area O is the current PWM value of the optical area O.
Further, calculating a current PWM value of the light zone L1 by combining the illuminance of the ambient light, the preset target illuminance, the illuminance of the light zone O provided to the segment OL1, and the illuminance curve of the light zone L1, so that the illuminance of the segment OL1 reaches the target illuminance includes:
subtracting the illuminance of the ambient light from the preset target illuminance, and subtracting the illuminance provided by the optical area O to the subarea OL1 to obtain the required illuminance;
adjusting the current PWM value of the light zone L1 to make the average value of the illuminance of the subarea OL1 or the illuminance of a certain point in the subarea O' reach the required illuminance; at this time, the current PWM value of the light region L1 is the current PWM value of the light region L1.
The invention also provides an ADB headlamp brightness and light zone adaptive adjusting device for realizing the ADB headlamp brightness and light zone adaptive adjusting method, which comprises the following steps: the device comprises a camera, an illumination sensor, an ESC, a high beam and low beam switch, an ADB automatic switch, an ADB functional module and a left LED matrix lamp and a right LED matrix lamp;
the camera is used for acquiring vehicle obstacle information and further determining the opening and closing of each light area according to the vehicle obstacle information;
the illumination sensor is used for acquiring the illumination of ambient light;
the ESC is used for acquiring vehicle speed information;
the far and near light switch and the ADB automatic switch are used for acquiring the states of the far and near light switch and the ADB automatic switch;
and the ADB functional module controls the on and off of the left and right LED matrix lamps and the brightness adjustment according to the acquired vehicle obstacle information, the illuminance of ambient light, the vehicle speed information, the far and near light switch and the state of the ADB automatic switch.
Further, the illumination sensor is a solar-rain sensor.
Further, the device also comprises an IBCM, and the ADB functional module is integrated in the IBCM.
Further, ADB activates when the following conditions are simultaneously satisfied: firstly, an ADB automatic switch is in an AUTO gear, secondly, a dipped headlight is in a lighting state, a high beam switch is turned on, thirdly, the vehicle speed is greater than V1, and fourthly, the ambient light intensity is less than Q1.
Further, the ADB exits when one of the following conditions is satisfied: firstly, an ADB automatic switch is in a non-AUTO gear, secondly, a dipped headlight is in an off state or a high beam switch is turned off, thirdly, the vehicle speed is less than V2, wherein V2 is less than V1, fourthly, the ambient light intensity is greater than Q2, and Q2 is greater than Q1.
Compared with the prior art, the invention has the following advantages and beneficial effects:
when the ADB is activated, the central light area is lightened firstly, and then other light areas are lightened sequentially towards two sides, so that the illumination intensity is basically consistent after each subarea is superposed with ambient light; if a certain light zone is in a closed state, the light zone is skipped, the next light zone in an open state is lightened, and adaptive adjustment of brightness under different ambient lights is performed, so that the problem of inconsistent illumination after ADB light is superposed with different ambient lights can be effectively solved.
In addition, the ADB headlamp brightness and light area adaptive adjusting device provides judgment conditions for ADB activation and exit, and can effectively solve the problems of sudden opening or closing of high beam and sudden brightness change.
Drawings
Fig. 1 is a schematic diagram of an adaptive dimming control (ADB) headlight luminance and light range adjustment apparatus according to an embodiment of the present invention;
fig. 2 is a light intensity distribution diagram of a light region according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating PWM state transition when brightness is changed according to an embodiment of the present invention;
fig. 4 is a sectional view of an ADB headlamp according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention solves the problems that the brightness of light irradiated by ADB is consistent and the perceived illuminance is inconsistent under different scenes after the ambient light is superposed aiming at different ambient lights, and the human eye sensory difference is caused by the conditions that the far light is suddenly turned on or off, the brightness is suddenly changed and the like.
As shown in fig. 1, the ADB headlight brightness and light zone adaptive adjusting device of the present invention includes a sunlight and rain sensor, an IBCM (integrated ADB function), a high beam and low beam switch, an ADB automatic switch, a camera, an ESC, and the like.
Wherein: the sunlight and rainfall sensor provides ambient illumination parameters; the IBCM integrates an ADB function and is used for controlling the on or off of the high-beam and low-beam light and the ADB function; the ADB functional module controls the brightness and the switch of the matrix type LED; the ADAS camera provides information such as environmental barriers, and further determines the opening and closing of each light area according to the information of the vehicle barriers. And a high beam and low beam switch, an ESC and the like are used as input and used as control input for opening and closing the high beam by the IBCM. The left lamp and the right lamp are used as actuators to execute the control command of the ADB function module.
Specifically, the IBCM (body controller) determines whether the ADB function module is turned on or off according to the collected hard-line high beam, low beam, and ADB automatic lighting states, the received vehicle speed information sent by the ESC, and the ambient lighting information of the solar-rain sensor, specifically as follows:
ADB function on condition (all conditions are satisfied):
1. the ADB light switch is in AUTO grade;
2. the dipped beam is in a lighting state and the high beam switch is turned on;
3. vehicle speed is greater than V1;
4. the sunlight and rainfall sensor collects that the ambient light intensity is less than Q1;
ADB function exit conditions (only any one of them is required):
1. the ADB light switch is in a non-AUTO grade;
2. the dipped beam is in the off state or the high beam switch is turned off;
3. vehicle speed is less than V2(V2< V1);
4. the sunlight and rain sensor collects ambient light intensity which is greater than Q2(Q2> Q1).
Meanwhile, the IBCM determines the LEDs needing to be turned off according to the vehicle obstacle information sent by the camera. The IBCM transmits the LED and the brightness information which need to be closed to the left and right lamp panels through the CAN; IBCM mainly requires control processing such as coordinate conversion and light area confirmation.
The IBCM also controls the current PWM value of each light area according to the collected illumination information of the sunlight and rainfall sensor (the light intensity collected by the sunlight and rainfall sensor is used for replacing the light intensity of the ambient light), so that the illumination intensity of each environment is basically consistent after the ambient light is superposed.
The method comprises the following specific steps:
s1, in a dark room, testing a light intensity distribution diagram of the LED lighting in a single light area (PWM ═ X, where PWM is set to 1, and the following PWM is a ratio of the PWM), and determining an illuminance curve of the single light area as shown in fig. 2. Taking the range (-A, A) of the O region of the central light region as an example, the illumination intensity of the 0 point of the central light intensity is assumed to be Y0lx (Ix, lux, i.e. illuminance), edge A point light intensity is YAlx, intensity at midpoint A/2 of edge and center is YA/2lx, fitting a quadratic illumination curve of a single light region according to the three terms:
light intensity Y is 2 (Y)A+Y0-2YA/2)/A2*X2+(4YA/2-3Y0-YA)/A*X+Y0，X∈(-A，A)。
And (4) solving a fitting curve of each zone according to the same type method.
S2, determine the high beam on illumination point Q1 (the intensity Q1 is ADB activation condition), and turn off the intensity Q2 (can guarantee the illumination requirement) with the ADB function as the target value. The illumination intensity is Q1 when the lamp is turned on for the first time, and the PWM value is gradually increased in the time t, so that the illumination intensity at the time t is equivalent to the illumination intensity of Q2. As shown in fig. 3, when the light intensity is just lower than Q1, the ADB function is activated, and the PWM of the light region is adjusted such that the light intensity corresponding to the adjusted PWM is equal to the predetermined light intensity (Q2, target value in this embodiment).
S3, taking the effect of closing the environmental light intensity Q2 as a reference, in a dark room, adjusting the PWM value of each light area to make the illumination intensity equal to the environmental light of Q2, and making the PWM value of each light area be the maximum value.
Assuming that the irradiation angle range of the light region L1 is (B-C, B + C), the PWM maximum value is Y; the irradiation angle range of the central light area O is (-A, A), and the maximum value of PWM is X; the irradiation angle range of the light region R1 is (D-E, D + E), and the maximum PWM value is Z;
typically, there is partial overlap at the edges of the light regions: a < B + C, D-E < A, then 3 regions will have 5 segments, as follows:
(B-C，-A)；(-A，B+C)；(B+C，D-E)；(D-E，A)；(A，D+E)。
the relationship between the light intensity of each segment and the PWM is as follows (the light intensity adjusting method is explained below for 3 segments):
the field strength of the O-region PWM ═ X is:
Yo＝2(YA+Y0-2YA/2)/A2*X2+(4YA/2-3Y0-YA)/A*X+0；X∈(-A，A)；
similarly, the PWM ═ Z field strength in the R1 region is:
YR1＝2(YD+YD+E-2Y(2D+E)/2)/E2*X2+(4Y(D+E)/2-3YD-YE)/A*X+YD；X∈(D-E，D+E)；
similarly, the PWM — Y field strength in the L1 region is:
YL1＝2(YB+YB+C-2Y(2B+E)/2)/C2*X2+(4Y(2B+C)/2-3YB-YB+C)/C*X+YB；X∈(B-C，B+C)。
and if the percentage coefficient of the PWM in the O area is P1, the percentage coefficient of the PWM in the L1 area is P2, the percentage coefficient of the PWM in the R1 area is P3, and the percentage coefficients are used for calculating the duty ratio, the field strength in the overlapped area is as follows:
Y＝P2*YL1，X∈(B-C，-A)
Y＝P1*Yo+P2*YL X∈(-A，B+C)
Y＝P1*Yo，X∈(B+C，D-E)
Y＝P1*Yo+P3*YR1，X∈(D-E，A)
Y＝P3*YR1，X∈(A，D+E)
the relationship of the light intensity to the coordinates and the PWM for each coordinate point can be obtained.
In order to ensure that the light intensity decreases from the central point of the whole vehicle to two sides, namely within the illumination range, for example (-20 degrees and 20 degrees), the light intensity increases progressively within the range of (-20 degrees and 0 degrees, the light intensity decreases progressively within the range of 0 degrees and 20 degrees, and the illumination is ensured to be uniform as much as possible. The average value of the illuminance in the range or the illuminance at a certain point can be made to reach the required illuminance.
Calculating an initial value:
the central light area is calculated first, and then the light areas on the two sides are calculated in sequence. The P1 is calculated according to different scenes, such as the environmental light intensity Q1 and the target value Q2 at the time of initial start. Therefore, the light intensity value of-A/2 (selected midpoint) in the O light area is Q2-Q1. And the PWM is obtained by inverse solution according to the fitted curve. That is, P1 was determined when Y was equal to Q2 to Q1. And sequentially calculating other values after the initial value is obtained.
When the ambient light illumination changes, the curve relation between the initial value of the PWM in the O area and the ambient light Qx is obtained as follows:
P1＝4*(Qx-Q1)/(YA+6YA/2-Y0) (ii) a And then the value of P1 is calculated according to the relation curve.
S4, according to the ambient brightness and the obstacle information, the brightness is gradually adjusted under the condition that the glare is prevented, and the steady switching of the sensed ambient brightness of the main pipe is realized when the ambient brightness is changed and the ambient brightness is switched on and off. And after the left lamp panel and the right lamp panel receive the IBCM control signal, the LED matrix of the left lamp and the right lamp is driven to be lightened and adjusted to proper brightness.
When the light area is closed, the control flow is as follows:
as shown in fig. 4, the segment of the ADB headlamp includes … … L2 ', L1L2, L1 ', OL1, O ', OR1, R1 ', R1R2, and R2 ' … … in order from left to right; wherein: … … L2, L1, O, R1 and R2 … … are light regions of the ADB headlamp in sequence, … … L1L2, OL1, OR1 and R1R2 … … are overlapped regions between two adjacent light regions of the ADB headlamp in sequence, … … L2 ', L1 ', O ', R1 ' and R2 ' … … are residual regions of the light regions of the ADB headlamp except the overlapped regions;
in a darkroom, acquiring a light intensity distribution diagram of each light area of the ADB headlamp, and further determining an illumination curve of each light area;
when the ADB is activated, the central light area is lightened firstly, and then other light areas are lightened sequentially towards two sides, so that the illumination intensity is basically consistent after each subarea is superposed with the ambient light; if a certain light zone is in a closed state, skipping the light zone, and lightening the next light zone in an open state;
the method comprises the following specific steps:
s1, when the ADB is activated, firstly judging whether the central light area O is opened or not; if the light area O is opened, calculating to obtain a current PWM value of the light area O by combining the illuminance of the ambient light, the preset target illuminance and the illuminance curve of the light area O, so that the illuminance of the subarea O' reaches the target illuminance; if the light zone O is off, go to step S4;
s2, judging whether an adjacent light zone L1 on the left side of the light zone O is opened or not; if the light zone L1 is opened, calculating to obtain a current PWM value of the light zone L1 by combining the illuminance of ambient light, a preset target illuminance, the illuminance provided by the light zone O to the subarea OL1 and an illuminance curve of the light zone L1, so that the illuminance of the subarea OL1 reaches the target illuminance; if the light zone L1 is off, perform step S4;
s3, whether the adjacent light zone L2 on the left side of the light zone L1 is opened is judged; if the light zone L2 is opened, calculating the current PWM value of the light zone L2 by the same method as that when the light zone L1 is opened, so that the illumination of the subarea L1L2 reaches the target illumination; by analogy, continuously judging the adjacent light area on the left side until all the light areas on the left side are calculated; if the light zone L2 is off, perform step S4;
s4, if a certain light zone is closed, judging whether an adjacent light zone on the left side of the light zone is opened; if the adjacent light area on the left side of the light area is opened, calculating the current PWM value of the adjacent light area on the left side of the light area by the same method as that when the light area O is opened; if the adjacent light zone on the left side of the light zone is turned off, performing step S4;
the control method of the right light area is consistent with that of the left light area. And according to the opening and closing states of the light areas, sequentially calculating the current PWM value of each light area from the center to two sides.
Further, calculating a current PWM value of the optical area O by combining the illuminance of the ambient light, the preset target illuminance, and the illuminance curve of the optical area O, so that the illuminance of the partition O' reaches the target illuminance includes:
subtracting the illumination of the ambient light from the preset target illumination to obtain the required illumination;
adjusting the current PWM value of the optical area O to enable the average value of the illumination of the subarea O 'or the illumination of a certain point in the subarea O' to reach the required illumination; at this time, the current PWM value of the optical area O is the current PWM value of the optical area O.
Further, the calculating of the current PWM value of the light region L1 by combining the illuminance of the ambient light, the preset target illuminance, the illuminance of the light region O provided to the segment OL1, and the illuminance curve of the light region L1 includes:
subtracting the illuminance of the ambient light from the preset target illuminance, and subtracting the illuminance provided by the optical area O to the subarea OL1 to obtain the required illuminance;
adjusting the current PWM value of the light zone L1 to make the average value of the illuminance of the subarea OL1 or the illuminance of a certain point in the subarea O' reach the required illuminance; at this time, the current PWM value of the light region L1 is the current PWM value of the light region L1.
It should be noted that, according to the implementation requirement, each step/component described in the present application can be divided into more steps/components, and two or more steps/components or partial operations of the steps/components can be combined into new steps/components to achieve the purpose of the present invention.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.
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