CN-121989793-A - Road surface drawing device for vehicle

CN121989793ACN 121989793 ACN121989793 ACN 121989793ACN-121989793-A

Abstract

The invention provides a road surface drawing device for a vehicle. The object is to suppress glare of a person caused by reflection of pattern light from a road surface drawing device on an ice road surface. A road surface drawing device for a vehicle is provided with a road surface drawing lamp that irradiates pattern light, and a controller that controls the road surface drawing lamp. The controller determines a plurality of conditions including a first condition, a second condition, and a third condition for each fixed distance (Dc) traveled by the vehicle. The first condition is that the outside air temperature of the vehicle is below a predetermined temperature (Tth). The second condition is that the brightness of the reflected light in the irradiation region of the headlight of the vehicle is a predetermined brightness (BRth) or less. The third condition is that at least one of ABS, ESC and TRC is operated during the running of the vehicle at the nearest preset distance (Dp). When the above-described plurality of conditions are satisfied, the controller executes glare reduction control for performing stopping of irradiation of at least a part of the pattern light, reduction of the light quantity, or modification of the form.

Inventors

Yaya Watanabe
TSUZUKI KATSUTOSHI
Chuhe Zhenghe
SAKAI AKINARI
Nakazato taketo

Assignees

丰田自动车株式会社

Dates

Publication Date: 20260508
Application Date: 20251028
Priority Date: 20241105

Claims (5)

1. A road surface drawing device for a vehicle is provided with: a road surface drawing lamp for irradiating pattern light toward a road surface; a controller for controlling the road surface drawing lamp, The controller determines a plurality of conditions including a first condition, a second condition, and a third condition every time the vehicle travels a fixed distance, The first condition is that the outside air temperature of the vehicle is equal to or lower than a preset temperature at which the road surface is likely to be frozen, The second condition is that the brightness of the light reflected from the area irradiated with the light of the headlight of the vehicle toward the vehicle is equal to or lower than a preset brightness, The third condition is that at least one of an antilock brake control that suppresses locking of wheels of the vehicle, a side slip suppression control that suppresses side slip of the vehicle, and a traction control that suppresses idling of wheels of the vehicle is operated during running of the vehicle at a nearest predetermined set distance, The controller executes glare reduction control that performs stopping of irradiation of at least a part of the pattern light, reduction of the light quantity, or modification of the form when the plurality of conditions are satisfied.
2. The road surface drawing device for a vehicle according to claim 1, wherein, The controller determines the plurality of conditions every time the vehicle travels the fixed distance during execution of the glare reduction control, And ending the glare reduction control when at least one of the first condition, the second condition, and the third condition becomes unsatisfied.
3. The road surface drawing device for a vehicle according to claim 1 or 2, wherein, The pattern light includes far-position light that would be irradiated onto a road surface farthest from the vehicle without performing the glare reduction control, The controller stops irradiation of at least the far-field light in the pattern light in the glare reduction control.
4. The road surface drawing device for a vehicle according to claim 1 or 2, wherein, The pattern light includes a far-reaching light irradiated onto a road surface farthest from the vehicle, The controller reduces the light quantity of at least the far-order light out of the pattern light in the glare reduction control as compared with a case where the control is not performed.
5. The road surface drawing device for a vehicle according to claim 1 or 2, wherein, The pattern light includes a far-reaching light irradiated onto a road surface farthest from the vehicle, The controller changes the form of the far-field light in the pattern light so that the tip of the far-field light in the pattern light on the road surface is closer to the vehicle than in the case where the control is not performed in the glare reduction control.

Description

Road surface drawing device for vehicle Technical Field Disclosed is a road surface drawing device for a vehicle, wherein an image is drawn on the road surface around the vehicle. Background Conventionally, a road surface drawing device mounted on a vehicle has been proposed. The road surface drawing device draws an image on a road surface around the vehicle. The road surface drawing device irradiates pattern light in a manner of interlocking with a turn signal lamp, for example, to draw an image of a predetermined shape on a road surface. Patent document 1 discloses a road surface drawing device that irradiates a road surface with pattern light from a vehicle. The road surface drawing device detects a road surface drawing image drawn on a road surface by the irradiated pattern light, and changes the position or the range on the road surface on which the pattern light is irradiated when the detected road surface drawing image is missing or skewed. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2019-51792 Disclosure of Invention Problems to be solved by the invention In winter, frozen road surfaces such as mirrored ice and black ice (hereinafter referred to as mirrored ice) may occur. On an icy road surface such as mirrored ice, incident light is likely to be specularly reflected. Therefore, the pattern light of the road surface drawing device may be specularly reflected by specular ice or the like, and the reflected light may cause glare to pedestrians or the like. In the present specification, a road surface drawing device for a vehicle is disclosed that can suppress glare (glare) caused by reflection of pattern light of the road surface drawing device on an icy road surface. Means for solving the problems The road surface drawing device for a vehicle disclosed in the present specification is provided with a road surface drawing lamp that irradiates pattern light toward a road surface, and a controller that controls the road surface drawing lamp. The controller determines a plurality of conditions including a first condition, a second condition, and a third condition each time the vehicle travels a fixed distance. The first condition is that an outside air temperature of the vehicle is equal to or lower than a preset temperature at which freezing is likely to occur on the road surface. The second condition is that the brightness of light reflected from a region where light of a headlight of the vehicle is irradiated toward the vehicle is equal to or lower than a preset brightness. The third condition is that at least one of an antilock brake control (ABS) that suppresses locking of wheels of the vehicle, a side slip suppression control (ESC) that suppresses side slip of the vehicle, and a traction control (TRC) that suppresses idling of wheels of the vehicle operates during running of the vehicle at a nearest predetermined set distance. The controller executes glare reduction control that performs stopping of irradiation of at least a part of the pattern light, reduction of the light quantity, or modification of the form when the plurality of conditions are satisfied. According to this configuration, the frozen road surface on which specular reflection of the pattern light is likely to occur can be detected using the first condition, the second condition, and the third condition. In addition, the second condition is used for distinguishing the property of the road surface according to the brightness of the reflected light of the area where the light of the headlight is irradiated (referred to as a headlight irradiation area). That is, when the brightness of the reflected light in the headlamp irradiation area is large, it can be distinguished that the road surface is a snow road or the like that is likely to generate diffuse reflected light (specular reflected light is unlikely to be generated). On the other hand, when the brightness of the reflected light in the headlamp irradiation area is small, it can be distinguished that the road surface is mirror ice or the like, which is difficult to generate diffuse reflected light (specular reflected light is easily generated). According to the above configuration, when an icy road surface such as mirrored ice on which specular reflection of light is likely to occur is detected using the first condition, the second condition, and the third condition, glare reduction control is performed to stop irradiation of the pattern light, and the like, and thus, reflection of the pattern light on the icy road surface can be suppressed, and a person outside the vehicle can be made to feel dazzled. In the road surface drawing device of the vehicle of the present disclosure, the controller may determine the plurality of conditions each time the vehicle travels the fixed distance during execution of the glare reduction control, and may end the glare reduction control when at least one of the first condition, the second conditi