公开(公告)号：US20180307918A1

公开(公告)日：2018-10-25

申请号：US15520592

申请日：2015-10-15

Applicant: Beijing University Of Technology (CN) ,  Guizhou Expressway Group Co., Ltd. (CN)

Inventor： Jiangbi HU ,  Wenqian MA ,  Shilong MEI ,  Xiaoshun LU ,  Jianping CAO ,  Weili WANG ,  Yuanfeng ZHANG ,  Xiaoqin ZHANG ,  Da GUO ,  Meng WANG ,  Xiaoyu LI ,  Linxi GAO ,  Xiaojuan GAO ,  Feng LIU

IPC: G06K9/00 ,  G06K9/46 ,  B60W40/06

CPC classification number: G06K9/00798 ,  B60W40/06 ,  G06K9/4652 ,  G06K9/4661 ,  H05B37/0218 ,  Y02B20/46

Abstract: The invention relates to an illumination standard calculation method for a tunnel entrance section in daytime based on safe visual recognition. The method includes: (a) setting light environment parameters of the tunnel entrance section; (b) determining a feature position in the tunnel, and measuring the average road surface brightness L of the feature position; (c) placing a target object in the feature position and then making a driver drive at different speeds from outside the tunnel towards the target object to measure visual recognition distances D required by the driver to visually discover the target object under different driving speeds, and measuring the road surface brightness L20 at the position where the driver visually discovers the target object and calculating the brightness reduction factor K to be the ratio between L and L20; (d) resetting the average road surface brightness L of the tunnel entrance section and repeating steps (b) and (c) to obtain a plurality of different sets of visual recognition distances D and corresponding brightness reduction factors K; (e) using Sigmoid function model to calculate and fit the data of the plurality of sets of D and K to obtain a relational model formula of D and K: D = 215 1 + e ( - 708 + 56 ) + 27.6 ; (f) substituting a safe stopping sight distance D0 corresponding to a maximum speed limit of the tunnel into the formula to obtain the minimum brightness reduction factor K0 of the tunnel entrance section in daytime. The invention also relates to a system for implementing the illumination standard calculation method for a tunnel entrance section in daytime based on safe visual recognition.

公开(公告)号：US20230358634A1

公开(公告)日：2023-11-09

申请号：US18028540

申请日：2021-09-16

Applicant: BEIJING UNIVERSITY OF TECHNOLOGY

Inventor： Jiangbi HU ,  Yunpeng GUO ,  Xiaojuan GAO ,  Ronghua WANG

IPC: G01M11/02

CPC classification number: G01M11/0207

Abstract: The disclosure relates to a method for measuring parameters of roadway low-position lighting fixtures, comprising: selecting a plurality of sets of low-position lighting fixtures with preset color temperatures and color rendering indexes, or a set of low-position lighting fixtures configurable with multiple pairs of preset color temperature and color rendering index; for each set of the plurality of sets of low-position lighting fixtures or each pair of preset color temperature and color rendering index in the set of low-position lighting fixtures, dynamically recognizing a target under different predetermined luminance levels at different predetermined operating speeds; using obtained samples to fit a relationship model between recognition distance and luminance; and based on the fitted relationship model, determining at least one set of said plurality of sets of low-position lighting fixtures or determining at least one pair of preset color temperature and color rendering index for said set of low-position lighting fixtures. The disclosure also relates to an installation method of roadway low-position lighting fixtures and a road on which the lighting fixtures are installed. The invention overcomes the problems in the existing lighting fixture design in terms of the characteristic indicators of light source, installation height and light distribution.

公开(公告)号：US20170313237A1

公开(公告)日：2017-11-02

申请号：US15520562

申请日：2015-10-15

Applicant: Beijing University Of Technology (CN) ,  Guizhou Expressway Group Co., Ltd. (CN)

Inventor： Jiangbi HU ,  Meng WANG ,  Guiping GUAN ,  Mingyu XIE ,  Xiangzhen CHANG ,  Xiaoqin ZHANG ,  Da GUO ,  Wenqian MA ,  Yuanfeng ZHANG ,  Xiaoyu LI ,  Linxi GAO ,  Xiaojuan GAO ,  Feng LIU

IPC: B60Q1/14 ,  H05B37/02 ,  G06K9/00

CPC classification number: B60Q1/143 ,  E21F17/00 ,  F21S2/00 ,  F21W2131/101 ,  G06K9/00825 ,  H05B37/0218

Abstract: This invention relates to an illumination standard calculation method for a tunnel middle section based on safe visual recognition: (a) Setting the light environment of the tunnel middle section; (b) Placing a target object in the tunnel middle section; (c) Making a driver drive a motor vehicle at different speeds toward the target object, and measuring the visual recognition distances D required by the driver to visually discover the target object at different speeds; (d) Resetting the average brightness L of the tunnel middle section and repeating the steps (b) and (c) to obtain a plurality of different sets of visual recognition distances D and corresponding brightness values L; (e) Using the S model to fit the data of the plurality of sets of visual recognition distances D and brightness values L to obtain the formula of the relational model of D and L to be L=0.683/(5.575-In(D)); (f) Substituting a safe stopping sight distance D0 corresponding to a maximum speed limit of the tunnel into the model formula to obtain the dynamic minimum brightness value L0 required for the tunnel middle section under this tunnel light environment. The method improves the accuracy of safety evaluation of the tunnel middle section brightness, and the method is simple and convenient, and provides a reference basis for the road traffic safety research. The invention also provides a system for implementing this method.

公开(公告)号：US20190033140A1

公开(公告)日：2019-01-31

申请号：US15580363

申请日：2016-12-30

Applicant: Beijing University Of Technology (CN) ,  Guizhou Expressway Group Co., LTD. (CN)

Inventor： Jiangbi HU ,  Xiaoyu LI ,  Xiaojuan GAO ,  Xiaoqin ZHANG ,  Guiping GUAN ,  Jianmin WANG ,  Feng LIU ,  Linxi GAO ,  Yuanfeng ZHANG ,  Jiamei LIU ,  Pengfei XU ,  Jianlong CHENG ,  Jiechao CHENG ,  Ronghua WANG

IPC: G01J5/60 ,  G01M11/00

CPC classification number: G01J5/60 ,  G01M11/00

Abstract: The present invention relates to a visual efficacy measuring method for objects in different light environments, which comprises: (a) setting a light environment; (b) measuring a relationship between color temperature and time; (c) a driver visually recognizing a target object; (d) resetting the light environment, and repeating the step (c); (e) processing the visual recognition information data collected by the experiments so as to establish a relationship of the visual recognition time in relation with the light environmental parameters of color temperature, color rendering index and brightness; (0 performing visual efficacy analysis according to the processing results of the visual recognition information data. The present invention also provides a color temperature standard determining method for a tunnel middle section in day time, which comprises: (a) setting a light environment; (b) measuring a relationship between color temperature and time; (c) selecting a stably distributed color temperature segment; (d) determining the color temperature standard. The method of the present invention performs visual efficacy analysis of the influence that light environment settings of illumination on a night road or in a tunnel middle section have on drivers' visual recognition activity, thereby providing a good guiding standard for reasonable and efficient setting of color temperature, color rendering index and average brightness of an illumination device.

公开(公告)号：US20170337297A1

公开(公告)日：2017-11-23

申请号：US15524751

申请日：2015-10-15

Applicant: Beijing University Of Technology ,  Guizhou Expressway Group Co., Ltd.

Inventor： Jiangbi HU ,  Xiaoqin ZHANG ,  Yuanfeng ZHANG ,  Xiaoyu LI ,  Guiping GUAN ,  Weili WANG ,  Wenqian MA ,  Da GUO ,  Meng WANG ,  Feng LIU ,  Xiaojuan GAO ,  Linxi GAO

IPC: G06F17/50 ,  G06K9/00 ,  G01M11/00

CPC classification number: G06F17/50 ,  G01M11/00 ,  G01M11/005 ,  G06K9/00624 ,  H05B33/0857 ,  H05B37/02

Abstract: The present invention relates to a visual efficacy determining method for non-colored objects in different light environments, comprising: a) setting light environment; b) placing an object for performing visual recognition of a driver; c) resetting the light environment, and repeating the step b); d) processing visual recognition information data obtained after experiments, and establishing a correlating relationship between visual recognition time and color temperature, color rendering index and brightness parameters of the light environment; and e) performing visual efficiency analysis according to the visual recognition information data processing results. The present invention further provides a system for implementing the visual efficacy determining method for non-colored objects in different light environments, wherein the system comprises a simulated tunnel middle section subsystem, a testing subsystem and a data processing subsystem. According to the method and the system disclosed by the present invention, visual efficacy analysis is performed on the visual influence of the light environment setting of the illumination of a night road and a tunnel middle section on the driver, and good guidance standards are provided for the reasonable and efficient setting of the color temperature, color rendering index and average brightness of a lighting device.