CN-122002670-A - Road surface drawing device for vehicle

Abstract

The present invention suppresses glare to humans caused by reflection of pattern light of a road surface drawing device on an icy road surface. A road surface drawing device for a vehicle is provided with a road surface drawing lamp for irradiating pattern light, and a controller for controlling the road surface drawing lamp. The controller determines a plurality of conditions including a 1 st condition, a2 nd condition, and a 3 rd condition. Condition 1 is that the illuminance of the outside of the vehicle is equal to or less than a predetermined illuminance ILth. Condition 2 is that the outside air temperature of the vehicle is equal to or lower than a predetermined temperature Tth. The 3 rd condition is that the traction control TRC is operated for a predetermined time t1th a predetermined number of times N1th or more and the lateral slip suppression control ESC is operated for a predetermined time t1th a predetermined number of times N2th or more. When the plurality of conditions are satisfied, the controller executes glare reduction control for stopping irradiation of at least a part of the pattern light, reducing the amount of light, or changing the mode.

Inventors

• Watayaku Masaya
• TSUZUKI KATSUTOSHI
• SAKAI AKINARI
• Chuhe Zhenghe
• Nakazato taketo

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260508

Application Date

20251016

Priority Date

20241105

Claims (5)

1. 1. A road surface drawing device for a vehicle is characterized by comprising: a road surface drawing lamp for irradiating pattern light toward the road surface, and A controller which controls the road surface drawing lamp, The controller judges a plurality of conditions including a1 st condition, a 2 nd condition and a3 rd condition, The condition 1 is that the illuminance of the outside of the vehicle is equal to or less than a preset illuminance corresponding to the illuminance at the evening or night after sunset, The condition 2 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 freeze, The 3 rd condition is that traction control that suppresses idling of wheels of the vehicle is operated a1 st predetermined number of times or more within a predetermined time period and lateral slip suppression control that suppresses lateral slip of the vehicle is operated a2 nd predetermined number of times or more within the predetermined time period, The controller executes glare reduction control for stopping irradiation of at least a part of the pattern light, reducing the amount of light, or changing the mode when the plurality of conditions are satisfied.
2. 2. A road surface drawing device for a vehicle is characterized by comprising: a road surface drawing lamp for irradiating pattern light toward the road surface, and A controller which controls the road surface drawing lamp, The controller judges a plurality of conditions including a1 st condition, a 2 nd condition and a3 rd condition, The condition 1 is that the illuminance of the outside of the vehicle is equal to or less than a preset illuminance corresponding to the illuminance at the evening or night after sunset, The condition 2 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 freeze, The 3 rd condition is that, when at least one of traction control for suppressing the spin of the wheels of the vehicle and lateral slip suppression control for suppressing the lateral slip of the vehicle is not used, anti-lock brake control for suppressing the lock of the wheels of the vehicle is operated for a predetermined number of times or more within a predetermined time, The controller executes glare reduction control for stopping irradiation of at least a part of the pattern light, reducing the amount of light, or changing the mode when the plurality of conditions are satisfied.
3. 3. The road surface drawing apparatus of a vehicle according to claim 1 or 2, characterized in that, The pattern light includes far-reaching light irradiated to a road surface farthest from the vehicle without performing the glare reduction control, The controller stops irradiation of at least the far-field light of the pattern light in the glare reduction control.
4. 4. The road surface drawing apparatus of a vehicle according to claim 1 or 2, characterized in that, The pattern light includes far-field light irradiated to a road surface farthest from the vehicle, The controller reduces the light quantity of at least the far-order light of the pattern light in the glare reduction control as compared with a case where the control is not performed.
5. 5. The road surface drawing apparatus of a vehicle according to claim 1 or 2, characterized in that, The pattern light includes far-field light irradiated to a road surface farthest from the vehicle, In the glare reduction control, the controller changes the pattern light such that the distal end of the pattern light on the road surface is closer to the vehicle than in the case where the control is not performed.

Description

Road surface drawing device for vehicle Technical Field Disclosed is a road surface drawing device for a vehicle, which draws an image on a 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 conjunction with a turn signal lamp, for example, and draws 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 deformed. Patent document 1 Japanese patent application laid-open No. 2019-51792 Disclosure of Invention In winter, there are cases where frozen road surfaces such as mirror ice or black ice (hereinafter, referred to as mirror ice or the like) occur. On an icy road surface such as a mirror surface, incident light is easily specularly reflected. Therefore, the pattern light of the road surface drawing device is specularly reflected by specular ice or the like, and there is a possibility that a pedestrian or the like may feel glare due to the reflected light. In the present specification, a road surface drawing device for a vehicle is disclosed that can suppress glare (glare) to a person outside the vehicle by reflection of pattern light of the road surface drawing device on an icy road surface. The road surface drawing device for a vehicle disclosed in the present specification is provided with a road surface drawing lamp for irradiating pattern light onto a road surface, and a controller for controlling the road surface drawing lamp. The controller determines a plurality of conditions including a 1 st condition, a2 nd condition, and a 3 rd condition. The condition 1 is that illuminance of the outside of the vehicle is equal to or less than a preset illuminance corresponding to illuminance in evening or night after sunset. The condition 2 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 freeze. The 3 rd condition is that traction control (TRC) that suppresses idling of wheels of the vehicle operates a 1 st predetermined number of times or more within a predetermined time and lateral slip suppression control (ESC) that suppresses lateral slip of the vehicle operates a2 nd predetermined number of times or more within the predetermined time. The controller executes glare reduction control for stopping irradiation of at least a part of the pattern light, reducing the amount of light, or changing the mode when the plurality of conditions are satisfied. According to this configuration, the 1 st, 2 nd, and 3 rd conditions can be used to detect an environment in which pattern light is specularly reflected on an icy road surface and may be glare to a person outside the vehicle. Condition 1 is used to detect a relatively dark environment where people easily feel glare. Conditions 2 and 3 are used to detect an icy road surface on which specular reflection of pattern light is likely to occur. According to the above configuration, when a plurality of conditions including condition 1, condition 2, and condition 3 are satisfied, glare reduction control is performed to stop irradiation of pattern light, and the like, so that it is possible to suppress glare felt by a person outside the vehicle. In the road surface drawing device for a vehicle according to the present invention, the 3 rd condition may be that an antilock brake control (ABS) that suppresses locking of the wheels of the vehicle is operated for a predetermined number of times or more within a predetermined time without using at least one of a traction control (TRC) that suppresses idling of the wheels of the vehicle and a lateral slip suppression control (ESC) that suppresses lateral slip of the vehicle. Even if the condition 3 is used, an icy road surface on which specular reflection of pattern light is likely to occur can be detected. In the road surface drawing device of the vehicle of the present invention, the pattern light may include a far-field light that irradiates a road surface farthest from the vehicle without performing the glare reduction control, and the controller may stop irradiation of at least the far-field light of the pattern light in the glare reduction control. Since a part of the pattern light irradiated to the road surface far from the vehicle travels forward by being specularly reflected at a smaller angle with respect to the road surface than a part of the pattern light irradiated to the road surface near the vehicle, the reflecte