A headlamp control method, system, and vehicle

Abstract

The application provides a kind of headlamp control method, system and vehicle, it is related to vehicle light control technical field, including in the headlamp opening state, obtaining to be adjusted chassis height, current chassis height;Based on the mapping relationship between chassis height and headlamp beam front angle, headlamp beam rear angle, current chassis height and to be adjusted chassis height, obtain to be adjusted headlamp beam front angle and to be adjusted headlamp beam rear angle;Based on current headlamp beam front angle, current headlamp beam rear angle, the to be adjusted headlamp beam front angle of the to be adjusted headlamp beam rear angle and the to be adjusted headlamp beam rear angle, adjust the irradiation angle of headlamp, to make the relative position between the longitudinal illumination range and the headlamp unchanged.The safety in the process of vehicle driving can be preferably improved, and the precision of adjusting headlamp angle is high, and the effect is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle lamp control, in particular to a headlamp control method and system and vehicle. BACKGROUND

[0002] The vehicle headlamp is an important lighting device on the vehicle, which mainly undertakes the lighting work at night to light the road and objects in front of the vehicle to ensure the safety of vehicle driving. The vehicle headlamp needs to avoid dazzling the opposite driver when meeting while ensuring night lighting, which affects the safety of driving.

[0003] However, the current vehicle is generally provided with several different chassis heights to adapt to different road conditions. When the chassis height of the vehicle changes, the height of the headlamp will also change with the change of the chassis height of the vehicle, and the illumination range of the vehicle headlamp on the ground will also change. When the illumination range of the headlamp on the ground changes, the driver may feel that the image in front of him jumps, so that the driver may have difficulty in quickly and accurately judging the road conditions in front of him when the illumination range of the headlamp changes, thereby increasing the safety risk in the driving process.

[0004] In a Chinese patent (authorized publication number CN215042422U), a vehicle lamp adjusting system and vehicle are disclosed, which include a vehicle body controller, a vehicle lamp adjusting motor for adjusting the height of the light, and a human-computer interaction device configured to detect a light height adjustment user input instruction and output a corresponding light height adjustment signal to the vehicle body controller in response to the light height adjustment user input instruction. The vehicle body controller is electrically connected with the human-computer interaction device and the vehicle lamp adjusting motor, and is configured to output a motor control signal corresponding to the light height adjustment signal to the vehicle lamp adjusting motor in response to the light height adjustment signal, so as to improve the integration of the vehicle body electrical control system. The posture angle of the vehicle is obtained by the sensors at the front and rear wheels to adjust the vehicle lamp, so that the vehicle body controller adjusts the vehicle lamp to adjust the height of the light. However, the application does not make detailed description on how to adjust the vehicle lamp, and the application is not applied to the case where the chassis height of the vehicle changes. After the chassis height of the vehicle changes, the relative position between the illumination range of the headlamp on the ground and the vehicle changes, which easily affects the safety of the driver during driving. This problem needs to be solved. SUMMARY

[0005] One of the purposes of the present application is to provide a headlamp control method, system and vehicle to solve the problem in the prior art that the vehicle headlamp changes with the change of the chassis height, which causes the relative position between the illumination range of the headlamp on the ground and the vehicle to change, thereby affecting the driver's accurate judgment of the road conditions in front of him, and thereby affecting the safety of the driver during driving.

[0006] To achieve the above object, the present application provides a headlamp control method, comprising:

[0007] In the headlamp on state, a to-be-adjusted ride height and a current ride height are acquired;

[0008] Based on a mapping relationship between the ride height and a front beam angle of the headlamp and a rear beam angle of the headlamp, the current ride height and the to-be-adjusted ride height, a to-be-adjusted front beam angle of the headlamp and a to-be-adjusted rear beam angle of the headlamp are obtained, the front beam angle of the headlamp is an acute angle between a front boundary of a projection of an illumination range of the headlamp in a vehicle width direction and a vertical direction, and the rear beam angle of the headlamp is an acute angle between a rear boundary of the projection of the illumination range of the headlamp in the vehicle width direction and the vertical direction;

[0009] Based on the current front beam angle of the headlamp, the current rear beam angle of the headlamp, the to-be-adjusted front beam angle of the headlamp and the to-be-adjusted rear beam angle of the headlamp, an illumination angle of the headlamp is adjusted, so that a relative position between an illumination range of the headlamp on the ground and the vehicle is unchanged.

[0010] In an exemplary embodiment, the to-be-adjusted ride height is acquired through a manual mode or an automatic mode.

[0011] In an exemplary embodiment, the manual mode acquires the to-be-adjusted ride height through an input device, and the automatic mode obtains the to-be-adjusted ride height through a current vehicle speed and a mapping relationship between the vehicle speed and the ride height.

[0012] In an exemplary embodiment, based on the mapping relationship between the ride height and the front beam angle of the headlamp and the rear beam angle of the headlamp, the current ride height and the to-be-adjusted ride height, the to-be-adjusted front beam angle of the headlamp and the to-be-adjusted rear beam angle of the headlamp are obtained, comprising:

[0013] If the current ride height is different from the to-be-adjusted ride height, based on the mapping relationship between the ride height and the front beam angle of the headlamp and the rear beam angle of the headlamp and the to-be-adjusted ride height, the to-be-adjusted front beam angle of the headlamp and the to-be-adjusted rear beam angle of the headlamp are obtained.

[0014] In an exemplary embodiment, based on the current front beam angle of the headlamp, the current rear beam angle of the headlamp, the to-be-adjusted front beam angle of the headlamp and the to-be-adjusted rear beam angle of the headlamp, the illumination angle of the headlamp is adjusted, comprising:

[0015] If the to-be-adjusted headlamp beam front angle is different from the current headlamp beam front angle, or the to-be-adjusted headlamp beam rear angle is different from the current headlamp beam rear angle, the current headlamp beam front angle or the current headlamp beam rear angle is adjusted until the current headlamp beam front angle is the same as the to-be-adjusted headlamp beam front angle, and the to-be-adjusted headlamp beam rear angle is the same as the current headlamp beam rear angle.

[0016] In an exemplary embodiment, the headlamp is an LED dot matrix screen.

[0017] In an exemplary embodiment, the LED dot matrix screen is adjusted by turning on or off the LED lamps in the LED dot matrix screen so that the LED dot matrix screen meets the to-be-adjusted headlamp beam front angle and the to-be-adjusted headlamp beam rear angle.

[0018] The application also provides a headlamp control system for implementing the headlamp control method as described above, comprising:

[0019] a chassis height adjuster for adjusting the height of the chassis of the vehicle;

[0020] a vehicle height measuring sensor for measuring the height of the chassis of the vehicle;

[0021] a headlamp angle measurer for measuring the headlamp beam front angle and the headlamp beam rear angle, the headlamp beam front angle and the headlamp beam rear angle being the acute angle between the projection of the irradiation range of the headlamp in the width direction of the vehicle and the direction of gravity, respectively;

[0022] a headlamp adjuster for adjusting the irradiation angle of the headlamp;

[0023] a controller for, in the on state of the headlamp, obtaining a to-be-adjusted chassis height, obtaining the current chassis height through the vehicle height measuring sensor, obtaining the to-be-adjusted headlamp beam front angle and the to-be-adjusted headlamp beam rear angle based on the mapping relationship between the chassis height and the headlamp beam front angle, the headlamp beam rear angle, the current chassis height and the to-be-adjusted chassis height, and adjusting the irradiation angle of the headlamp through the headlamp adjuster based on the to-be-adjusted headlamp beam front angle and the to-be-adjusted headlamp beam rear angle.

[0024] The application also provides a vehicle comprising the headlamp control system as described above.

[0025] In an exemplary embodiment, the headlamp control system comprises four vehicle height measuring sensors, and the four vehicle height measuring sensors are respectively arranged on the chassis of the vehicle corresponding to the wheels of the vehicle.

[0026] The beneficial effects of the present application: through the mapping relationship between the chassis height and the front angle of the headlamp light beam and the rear angle of the headlamp light beam, the front angle of the headlamp light beam to be adjusted and the rear angle of the headlamp light beam to be adjusted can be obtained after the chassis to be adjusted is obtained, and the irradiation angle of the headlamp is adjusted through the above-mentioned manner, so that the relative position between the longitudinal lighting range and the headlamp is unchanged. The method is simple, easy to implement, has high adjustment precision, and has good effect on adjusting the irradiation range of the headlamp. The headlamp control method can keep the relative position between the longitudinal lighting range and the headlamp unchanged, and can better improve the safety during vehicle driving. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a flowchart of the headlamp control method of the present application;

[0028] Figure 2 It is a schematic diagram of the front angle of the headlamp light beam and the rear angle of the headlamp light beam of the vehicle at different chassis heights of the present application;

[0029] Figure 3 It is a change schematic diagram of the LED dot matrix screen of the vehicle at different chassis heights of the present application. DETAILED DESCRIPTION

[0030] The embodiments of the present application will be described below with reference to the accompanying drawings and preferred embodiments, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure in the specification. The present application can also be implemented or applied by means of other different specific embodiments, and various modifications or changes can be made to the details in the specification based on different views and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, and are not intended to limit the protection scope of the present application.

[0031] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and only the components related to the present application are shown in the diagrams, not the number, shape and size of the components when actually implemented. The actual implementation of each component may be a random change in type, number and proportion, and the component layout pattern may also be more complex.

[0032] Please refer to Figure 1 The present application provides a headlamp control method, comprising:

[0033] Step S110: In the headlamp on state, the chassis height to be adjusted and the current chassis height are obtained.

[0034] In an exemplary embodiment, the chassis height to be adjusted is obtained by manual mode or automatic mode. In another exemplary embodiment, the chassis height to be adjusted can only be obtained by manual mode, or the chassis height to be adjusted can only be obtained by automatic mode.

[0035] It can be understood that the manual mode is a way of manual input by a person, and provides the vehicle with a to-be-adjusted chassis height. The automatic mode automatically matches the to-be-adjusted chassis height of the vehicle through preset correlation information in the vehicle.

[0036] In an example embodiment, the manual mode obtains the to-be-adjusted chassis height through an input device, which can be an electronic display screen, a button or other input device.

[0037] In an example embodiment, the automatic mode is obtained through the current vehicle speed and a mapping relationship between the vehicle speed and the chassis height. In the automatic mode, the faster the current vehicle speed, the lower the chassis height, so as to obtain better grip and higher safety; the slower the current vehicle speed, the higher the chassis height, so as to increase the comfort during driving and better off-road performance. Therefore, when the current vehicle speed is faster and the chassis height is lowered, the current headlamp beam front angle or the current headlamp beam rear angle increases with the increase of the chassis height; when the current vehicle speed is slower and the chassis height is increased, the current headlamp beam front angle or the current headlamp beam rear angle decreases with the increase of the chassis height.

[0038] In another example embodiment, the vehicle speed is divided into three continuous speed intervals, and the three speed intervals are in turn off-road mode speed interval, design mode speed interval and sports mode speed interval from small to large, and the three speed intervals correspond to different vehicle chassis heights, wherein the vehicle chassis height corresponding to the off-road mode speed interval is the highest, the vehicle chassis height corresponding to the sports mode speed interval is the lowest, and the vehicle chassis height corresponding to the design mode speed interval is between the vehicle chassis heights corresponding to the design mode speed interval and the sports mode speed interval, so as to realize automatic adjustment of the chassis in the automatic mode. In another example embodiment, the vehicle speed can be divided into four continuous speed intervals, and the number of speed intervals of the vehicle speed can be adjusted according to actual customer demand.

[0039] Step S120: obtaining to-be-adjusted headlamp beam front angle and to-be-adjusted headlamp beam rear angle based on the mapping relationship between the chassis height and the headlamp beam front angle and the headlamp beam rear angle, the current chassis height and the to-be-adjusted chassis height, the headlamp beam front angle being an acute angle between a front boundary of a projection of a headlamp illumination range in a vehicle width direction and a vertical direction, and the headlamp beam rear angle being an acute angle between a rear boundary of the projection of the headlamp illumination range in the vehicle width direction and the vertical direction.

[0040] It should be noted that the orientation words "front" and "back" are relative position descriptions, which can be understood as the front end of the vehicle and the rear end of the vehicle on the vehicle. In the following description, if a single part description involves the orientation words "front" and "back", it corresponds to the orientation of the entire vehicle. At this point, it can be understood that the front boundary of the projection of the illumination range of the headlamp in the vehicle width direction is before the rear boundary.

[0041] The mapping relationship between the chassis height and the front angle of the headlamp beam and the rear angle of the headlamp beam needs to be calibrated before the vehicle is shipped. By setting different chassis heights, different front angles and rear angles of the headlamp beam are calibrated to keep the relative position between the illumination range of the headlamp beam on the ground and the headlamp unchanged after the change of the chassis height of the vehicle. In this way, the driver can have the same front and rear field of view before and after the change of the chassis, and the safety risk of driving the vehicle due to the change of the illumination range of the headlamp can be avoided.

[0042] In an exemplary embodiment, the vehicle has three different chassis heights, each of which has a corresponding front angle and rear angle of the headlamp beam. The height of the chassis can be adjusted according to the actual customer demand, as shown in Table 1 below:

[0043] Table 1 Relationship table of chassis height and front and rear angles of headlamp

[0044]

[0045] Taking Table 1 as an example, s is the length of the headlamp beam's illumination range on the ground along the vehicle's longitudinal direction, also known as the longitudinal illumination range s. In all three driving modes, the relative position of the longitudinal illumination range s to the vehicle remains unchanged, and the length of the longitudinal illumination range s also remains unchanged, meaning the relative position of the headlamp's illumination range on the ground remains unchanged. The longitudinal illumination range s can be determined by the angle between the headlamp beam's front angle and the headlamp beam's rear angle. d is the closest distance of the headlamp's illumination range on the ground to the vehicle along the vehicle's longitudinal direction, also known as the near end of the illumination range. c is the farthest distance of the headlamp's illumination range on the ground from the vehicle along the vehicle's longitudinal direction. It is the sum of the longitudinal illumination range s and the near end of the illumination range d, representing the far end of the illumination range. There are three chassis heights, based on the design height, with the chassis height raised and lowered by 50 mm as examples. When the chassis height is lowered by 50mm from the design height, the ground clearance of the headlights is reduced from 0.85m to 0.8m, and the front angle of the headlights increases from 89.02° to 89.08° as the chassis height is lowered. At the same time, the rear angle of the headlights increases from 80.35° to 80.91°; when the chassis height is raised by 50mm from the design height, the ground clearance of the headlights is increased from 0.85m to 0.9m, and the front angle of the headlights decreases from 89.02° to 88.97° as the chassis height is raised. At the same time, the rear angle of the headlights decreases from 80.35° to 79.79°.

[0046] like Figure 2 As shown, the vehicle has three driving modes: design mode, off-road mode, and sport mode. These modes correspond to the design height, 50mm increase, and 50mm decrease of the chassis height in Table 1, respectively. These three driving modes can be switched manually or automatically, with the vehicle automatically switching between driving modes within a calibrated speed range. Each driving mode has a different chassis height: design mode chassis height e, off-road mode chassis height e1, and sport mode chassis height e2. α is the rear angle of the headlight beam in design mode, β is the front angle of the headlight beam in design mode, α1 is the rear angle of the headlight beam in off-road mode, β1 is the front angle of the headlight beam in off-road mode, α2 is the rear angle of the headlight beam in sport mode, and β2 is the rear angle of the headlight beam in sport mode. By setting the front and rear angles, the relative position of the longitudinal lighting range s and the headlight remains unchanged despite changes in the vehicle chassis height in different driving modes. When the driver is driving, after the height of the headlight changes with the height of the chassis, the illumination range of the headlight on the ground and the relative position of the headlights do not change, ensuring that the illumination range in front of the driver remains stable, avoiding changes in the illumination conditions in front of the driver, making it difficult for the driver to accurately judge the road conditions in a timely manner when changes occur, and causing safety accidents.

[0047] In an example embodiment, the to-be-adjusted headlamp beam front angle and the to-be-adjusted headlamp beam rear angle are obtained based on the mapping relationship between the chassis height and the headlamp beam front angle and the headlamp beam rear angle, the current chassis height, and the to-be-adjusted chassis height, including step S210.

[0048] Step S210: If the current chassis height is different from the to-be-adjusted chassis height, the to-be-adjusted headlamp beam front angle and the to-be-adjusted headlamp beam rear angle are obtained based on the mapping relationship between the chassis height and the headlamp beam front angle and the headlamp beam rear angle and the to-be-adjusted chassis height.

[0049] In an example embodiment, whether the illumination angle of the headlamp needs to be adjusted is determined by whether the current headlamp beam front angle is the same as the to-be-adjusted headlamp beam front angle and / or whether the current headlamp beam rear angle is the same as the to-be-adjusted headlamp beam rear angle.

[0050] Step S130: The illumination angle of the headlamp is adjusted based on the to-be-adjusted headlamp beam front angle and the to-be-adjusted headlamp beam rear angle, so that the relative position between the illumination range of the headlamp on the ground and the vehicle is unchanged.

[0051] In an example embodiment, the illumination angle of the headlamp is adjusted based on the current headlamp beam front angle, the current headlamp beam rear angle, the to-be-adjusted headlamp beam front angle, and the to-be-adjusted headlamp beam rear angle, including step S310.

[0052] Step S310: If the to-be-adjusted headlamp beam front angle is different from the current headlamp beam front angle or the to-be-adjusted headlamp beam rear angle is different from the current headlamp beam rear angle, the current headlamp beam front angle or the current headlamp beam rear angle is adjusted until the current headlamp beam front angle is the same as the to-be-adjusted headlamp beam front angle and the to-be-adjusted headlamp beam rear angle is the same as the current headlamp beam rear angle.

[0053] In an example embodiment, the headlamp is an LED dot matrix screen, and the LED dot matrix screen is adjusted to meet the to-be-adjusted headlamp beam front angle and the to-be-adjusted headlamp beam rear angle by adjusting the opening and closing of the LED lamps in the LED dot matrix screen. The LED dot matrix screen is arranged in an array matrix by a large number of LED lamps, and each LED lamp represents a pixel or a dot. These LED lamps are arranged according to certain rules to form the headlamp of the vehicle. The LED dot matrix screen uses a light shield plate to adjust the light angle, and the light shield plate is arranged on one side or around the LED lamps. By controlling the opening and closing of the LED lamps and the layout of the light shield plate, the emission direction and angle of the light beam are adjusted. Figure 3 In an example embodiment, the opening and closing of the LED lamps in the LED dot matrix screen under different chassis heights of the vehicle are shown in FIG. 2. From the perspective of the driver, the LED dot matrix screen is arranged on the front of the vehicle, and the LED lamps in the LED dot matrix screen are arranged in an array matrix. The LED lamps in the LED dot matrix screen are arranged according to certain rules to form the headlamp of the vehicle. The LED dot matrix screen uses a light shield plate to adjust the light angle, and the light shield plate is arranged on one side or around the LED lamps. By controlling the opening and closing of the LED lamps and the layout of the light shield plate, the emission direction and angle of the light beam are adjusted. Figure 3As can be seen, the lighting range of the headlamps in the off-road mode, the design mode and the sports mode on the ground and the relative position between the vehicle are the same, the chassis height of the vehicle in the off-road mode is the highest, and the chassis height of the vehicle in the sports mode is the lowest. When the chassis height of the vehicle changes from the off-road mode to the design mode, the LED dot matrix screen in the off-road mode changes from the originally closed upper two rows of LED lamps to the closed uppermost row of LED lamps and the lowermost row of LED lamps of the LED dot matrix screen of group B, so that the height of the LED lamp emitting light in the LED dot matrix screen can be adjusted. Similarly, when the chassis height of the vehicle changes from the design mode to the sports mode, the LED dot matrix screen in the design mode changes from the originally closed upper and lower edge two rows of LED lamps to the closed lowermost two rows of LED lamps in the sports mode. As can be seen, when the chassis height of the vehicle is increased, the height of the LED lamp emitting light in the LED dot matrix screen is lowered, and when the chassis height of the vehicle is lowered, the height of the LED lamp emitting light in the LED dot matrix screen is increased, so that the relative position between the lighting range of the headlamps and the vehicle remains unchanged. The LED dot matrix screen has the characteristics of high brightness, low power consumption, long service life and easy control. The chassis height of the vehicle can be adjusted according to the actual customer demand.

[0054] In an exemplary embodiment, the LED dot matrix screen realizes the opening and closing of the LED lamp by adjusting the brightness of the LED lamp. When the LED lamp is turned on, the brightness of the LED lamp gradually increases from the off state to the maximum brightness, and when the LED lamp is turned off, the brightness of the LED lamp slowly decreases from the maximum brightness to the off state. By adjusting the brightness of the LED lamp, the relative distance between the irradiation range of the LED dot matrix screen and the vehicle remains unchanged during the adjustment of the LED dot matrix screen with the chassis height of the vehicle, the switching is more smooth, the irradiation range in front of the driver is kept stable, and the situation that the irradiation condition in front of the driver changes temporarily due to the direct opening and closing switching of the LED lamp according to the chassis height of the vehicle during the adjustment of the LED dot matrix screen with the chassis height of the vehicle is avoided, so that the driver can accurately judge the road condition in time, and the safety accident is avoided.

[0055] In another exemplary embodiment, the headlamp comprises an angle adjusting support and a headlamp body arranged on the angle adjusting support, and the position of the headlamp body can be adjusted by the angle adjusting support, so as to adjust the irradiation angle of the light beam of the headlamp body. The number of the headlamps can be adjusted according to the actual customer demand.

[0056] The application provides a headlamp control system which runs the headlamp control method as described above, comprising:

[0057] A chassis height adjuster is arranged for adjusting the height of the chassis of the vehicle.

[0058] A vehicle height measuring sensor for measuring the height of a vehicle chassis;

[0059] A headlamp angle measurer for measuring a headlamp beam front angle and a headlamp beam rear angle, the headlamp beam front angle and the headlamp beam rear angle being acute angles between a projection of a headlamp illumination range in a vehicle width direction and a direction of gravity, respectively;

[0060] A headlamp adjuster for adjusting the illumination angle of a headlamp;

[0061] A controller for, in a headlamp on state, acquiring a to-be-adjusted chassis height, acquiring a current chassis height by a vehicle height measuring sensor, obtaining a to-be-adjusted headlamp beam front angle and a to-be-adjusted headlamp beam rear angle based on a mapping relationship between the chassis height and the headlamp beam front angle and the headlamp beam rear angle, the current chassis height and the to-be-adjusted chassis height, and adjusting the illumination angle of the headlamp by the headlamp adjuster based on the to-be-adjusted headlamp beam front angle and the to-be-adjusted headlamp beam rear angle.

[0062] In an example embodiment, the chassis height adjuster adjusts the height of the chassis by a hydraulic system. In another example embodiment, the chassis height adjuster comprises a cylinder, and the height of the chassis is adjusted by controlling the inflow and outflow of compressed air to change the pressure of the cylinder. The manner in which the chassis height adjuster adjusts the height of the chassis of the vehicle can be adjusted according to actual customer needs.

[0063] The application further provides a vehicle comprising the headlamp control system as described above.

[0064] In an example embodiment, the headlamp control system comprises four vehicle height measuring sensors, and the four vehicle height measuring sensors are arranged on the chassis of the vehicle respectively corresponding to the wheels of the vehicle. By arranging the vehicle height measuring sensors corresponding to the wheels on the vehicle, the height of the chassis of the vehicle can be measured conveniently.

[0065] In summary, by the mapping relationship between the chassis height and the headlamp beam front angle and the headlamp beam rear angle, the to-be-adjusted headlamp beam front angle and the to-be-adjusted headlamp beam rear angle can be obtained after the to-be-adjusted chassis height is acquired, and the illumination angle of the headlamp is adjusted by the above-mentioned manner, so that the relative position between the longitudinal illumination range and the headlamp remains unchanged. The method is simple, easy to implement, has high adjustment precision, and has good effect on adjusting the illumination range of the headlamp. The headlamp control method can keep the relative position between the longitudinal illumination range and the headlamp unchanged, and can improve the safety during the driving of the vehicle.

[0066] The above embodiments are only the preferred embodiments of the present application for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art based on the present application are within the protection scope of the present application.

Claims

1. A headlamp control method characterized by, The method comprises the following steps: In the headlamp on state, the to-be-adjusted chassis height and the current chassis height are acquired; Based on the mapping relationship between the chassis height and the headlamp beam front angle and the headlamp beam rear angle, the current chassis height and the to-be-adjusted chassis height, the to-be-adjusted headlamp beam front angle and the to-be-adjusted headlamp beam rear angle are obtained, the headlamp beam front angle is the acute angle between the front boundary of the projection of the illumination range of the headlamp in the vehicle width direction and the vertical direction, and the headlamp beam rear angle is the acute angle between the rear boundary of the projection of the illumination range of the headlamp in the vehicle width direction and the vertical direction; Based on the current headlamp beam front angle, the current headlamp beam rear angle, the to-be-adjusted headlamp beam front angle and the to-be-adjusted headlamp beam rear angle, the illumination angle of the headlamp is adjusted, so that the relative position between the illumination range of the headlamp on the ground and the vehicle is unchanged.

2. The headlamp control method according to claim 1, characterized by: The to-be-adjusted chassis height is acquired through a manual mode or an automatic mode.

3. The headlamp control method according to claim 2, characterized by: The to-be-adjusted chassis height is acquired through an input device in the manual mode, and the to-be-adjusted chassis height is obtained through the current vehicle speed and the mapping relationship between the vehicle speed and the chassis height in the automatic mode.

4. The headlamp control method according to claim 1, characterized by Based on the mapping relationship between the chassis height and the headlamp beam front angle and the headlamp beam rear angle, the current chassis height and the to-be-adjusted chassis height, the to-be-adjusted headlamp beam front angle and the to-be-adjusted headlamp beam rear angle are obtained, which comprises the following steps: If the current chassis height is different from the to-be-adjusted chassis height, the to-be-adjusted headlamp beam front angle and the to-be-adjusted headlamp beam rear angle are obtained based on the mapping relationship between the chassis height and the headlamp beam front angle and the headlamp beam rear angle and the to-be-adjusted chassis height.

5. The headlamp control method according to claim 1, characterized by Based on the current headlamp beam front angle, the current headlamp beam rear angle, the to-be-adjusted headlamp beam front angle and the to-be-adjusted headlamp beam rear angle, the illumination angle of the headlamp is adjusted, which comprises the following steps: If the to-be-adjusted headlamp beam front angle is different from the current headlamp beam front angle, or the to-be-adjusted headlamp beam rear angle is different from the current headlamp beam rear angle, the current headlamp beam front angle or the current headlamp beam rear angle is adjusted until the to-be-adjusted headlamp beam front angle is the same as the current headlamp beam front angle, and the to-be-adjusted headlamp beam rear angle is the same as the current headlamp beam rear angle.

6. The headlamp control method according to any one of claims 1-5, characterized in that: The headlamp is an LED dot matrix screen.

7. The headlamp control method according to claim 6, characterized by: The opening and closing of the LED lamps in the LED dot matrix screen are adjusted, so that the LED dot matrix screen meets the to-be-adjusted headlamp beam front angle and the to-be-adjusted headlamp beam rear angle.

8. A headlamp control system characterized by comprising: The headlamp control method comprises the following steps: A chassis height adjuster is arranged to adjust the height of the chassis of the vehicle; A vehicle height measuring sensor is arranged to measure the height of the chassis of the vehicle; A headlamp angle measuring device is arranged to measure the headlamp beam front angle and the headlamp beam rear angle, the headlamp beam front angle and the headlamp beam rear angle are respectively the acute angle between the projection of the illumination range of the headlamp in the vehicle width direction and the direction of gravity; A headlamp adjuster for adjusting an irradiation angle of a headlamp; A controller is configured to acquire a to-be-adjusted chassis height in a headlamp-on state, acquire a current chassis height through a vehicle height-sensing element, obtain a to-be-adjusted headlamp beam front angle and a to-be-adjusted headlamp beam rear angle based on a mapping relationship between the chassis height and the headlamp beam front angle and the headlamp beam rear angle, the current chassis height and the to-be-adjusted chassis height, and adjust the irradiation angle of the headlamp through the headlamp adjuster based on the to-be-adjusted headlamp beam front angle and the to-be-adjusted headlamp beam rear angle.

9. A vehicle characterized by comprising: The headlamp control system according to claim 8.

10. The vehicle of claim 9, characterized in that: The headlamp control system comprises four vehicle height-sensing elements, and the four vehicle height-sensing elements are arranged on a chassis of the vehicle and correspond to wheels of the vehicle respectively.

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