Experimental study on energy-saving of highway tunnel lighting with symmetric lamp distribution

Aim at the widely used energy —saving lamp in highway tunnel, in accordance with the relevant requirements in JTG/T D70/2— 01—2014“ Design Details of Highway Tunnel Lighting”, traffic prediction theory and multi-source information fusion method, internet of things technology was applied to tunnel lighting control. Taking a highway tunnel as background, this parper carried out application study on the on-demand lighting technology of highway tunnel, and it built LED tunnel lighting system on demand and developed dimming control system for highway tunnel based on the Internet of things, and it achieved networked and intelligent management of lighting energy saving.

Intelligent control and energy saving evaluation of highway tunnel lighting: Based on three-dimensional simulation and long short-term memory optimization algorithm

At present, the intelligent control technology of highway tunnel lighting mainly includes two types, graded dimming and stepless dimming, both of which have certain energy-saving effects. Tunnel lighting energy saving and consumption reduction, traffic safety, and the security degree are important indicators used to measure the efficient operation of a tunnel. By adding variable correlated color temperature (CCT) control based on stepless dimming, the adjustment of a lamp’s CCT according to changes in the external tunnel environment can be achieved. This not only serves the dual purpose of secondary energy saving and providing comfortable lighting, but also plays a significant role in reducing the reaction time and ensuring tunnel traffic safety. This paper mainly discusses the research achievements and applications of the main intelligent control technologies for highway tunnel lighting. Combining on-site investigations, operating and energy-saving effects achieved are evaluated, and the future development direction of intelligent control technology for highway tunnel lighting is summarized. Furthermore, this paper proposes an optimization model of a stepless dimming control system and intelligent control technology in the tunnel’s variable CCT based on stepless dimming. The results of this review can provide useful technical support for the design, operation and management of intelligent lighting control in highway tunnels.

The influences of tunnel lighting environment on drivers’ peripheral visual performance during transient adaptation

Highway tunnel lighting equipment, as an important equipment to ensure traffic safety in highway tunnel, has some problems in its production, installation, commissioning and operation, such as low intelligence degree and weak man machine interaction operation. On the basis of studying the existing test methods of highway tunnel lighting equipment, this paper designs an improved test process and method of highway tunnel lighting equipment, builds a cloud management platform for test data, realizes the automatic test of highway tunnel lighting equipment by using remote client combined with Ethernet, realizes the intellectualization of test process and the standardization of test data. The database and background management software deployed on the remote server can realize the classified management of many kinds of test data. The system can improve the testing efficiency of lighting equipment for the highway tunnel lighting equipment production enterprises, and improve the management efficiency and quality for the highway tunnel lighting management department.

Design of multi-channel data collector for highway tunnel lighting based on STM32 and Modbus protocol

Highway tunnel lighting is an important guaranteed condition for safe operation. In engineering applications in recent years, LED lamps, as the recommended road tunnel lamps, have the characteristics of good color rendering, fast start-up, and good energy-saving effect, but the color temperature of different LED lamps is also very different, and different color temperatures are used in tunnels. The LED lamps will have different effects on the driver. However, the current design specification only specifies the illuminance, brightness and uniformity of the lighting indicators, and does not list the color temperature values of lamps that can be used in tunnels of different lengths and speeds, resulting in the choice of tunnel lighting color temperature. It will bring adverse effects and hidden dangers to the safety of tunnel operation. Therefore, adjusting the color temperature value of tunnel lighting is of great significance to the driving safety and comfort of drivers in the tunnel. Combined with the tunnel lighting design of the Wudu to Jiuzhaigou section of the G8513 Pingmian Expressway, the control method of stepless dimming is recommended in this paper through the technical comparison of tunnel lighting control to create a green highway design concept. It can be concluded that when lamps with medium and high color temperature values are used in tunnels, drivers can improve the recognition and response speed of the surrounding environment, which is beneficial to driving safety. Tunnel lighting color temperature adjustable control technology is the way to achieve this goal, and ultimately meet the driving safety requirements, improve the driver’s driving comfort, and achieve accurate and efficient dimming of each section of lighting in the tunnel.

As an important part of ensuring traffic safety of highway tunnel, highway tunnel lighting system has some problems such as high energy consumption and low degree of intelligence in its use. In this paper, a set of intelligent dimming system for highway tunnel lighting is designed, which takes the environmental variables such as luminance value and traffic flow information inside and outside the tunnel as input, establishes the intelligent dimming mathematical calculation model, adjusts the output power of the system in real time, and then adjusts the brightness of LED lamps. At the same time, the system connects with the remote management system through Ethernet remote communication technology, and can also realize the function of remote dimming. It improves the intelligent level of highway tunnel lighting and reduces the energy consumption of highway tunnel lighting system.

Lighting accounts for a large proportion of energy consumption in highway tunnels. In the context of the “low-carbon economy” and “energy conservation and emission reduction” strategies, this article starts from designing energy conservation, and discusses energy saving of light sources, lamp arrangement, control system, and auxiliary lighting. It summarizes the related research results, and puts forward some insights on the future energy saving design of highway tunnel lighting in China, and provides a reference for highway tunnel lighting design.

Energy saving strategy of highway tunnel lighting mainly concentrated on shading facilities at tunnel entrances and exits, lighting intelligent control systems and lighting design methods. The contrast revealing coefficient qc is widely recognized as a key index used to assess the quality of tunnel lighting. The optimal values of the contrast revealing coefficient are associated with the optimal visual effecicy in tunnel lighting. This study aimed to give a new energy saving strategy based on optimal luminaire installation methods. Light Emitting Diode lamps (LED) were selected in tunnel lighting simulation experiment. The optimal luminaire installation method was determined by considering both the lighting quality evaluation system and the optimal value of the contrast revealing coefficient. Then, the lighting conditions achieved through the optimal luminaire installation method can be assessed based on the detection distance of small targets. Results showed that lighting environment under optimal luminaire installation method can fulfill the criteria for safe driving and visual comfort. Compared with the original luminaire installation method, the optimal luminaire installation method can save 24.32% of electrical energy.

Influenced by the closed and monotonous environment inside long highway tunnels, drivers are prone to be irritable and unconsciously accelerate to leave the tunnel, which exerts adverse influence on driving safety. To alleviate the psychological pressure of drivers, this paper, based on theory of color psychology, built numerous highway long tunnel models with different colored sidewalls, after which numerous driving simulation experiments were conducted to research the influence of sidewall color on driver’s heart rate and speed. The results showed the growth of heart rate would increase when drivers entered the long tunnel at about 1,500 m. Considering the color of the sidewall, the mean growth of heart rate was smallest in cyan, and the standard deviation of speed was smallest in blue. Considering color combinations, the mean growth of heart rate and the standard deviation of speed were smallest in the combination of blue and white.

Currently, highway tunnel development is on the upswing. As an important guarantee for traffic safety in highway tunnel, tunnel lighting has a short history of research. Since the 1960s when tunnel lighting began to become a subject of research, it was gradually and profoundly realized that lighting at the tunnel threshold zone was the focus of the entire tunnel lighting. This paper provides a review on past research into tunnel lighting and findings, and then introduces the latest theory and calculation methods regarding the luminance in the threshold zone of highway tunnel with a view to giving some valuable reference for engineering practice.

Aiming at the problems of cumbersome, time-consuming, inefficient and unable to create an accurate and controllable light environment for the input of the dimming system in the existing road tunnel lighting dimming quality inspection process, this paper designed a set of road tunnel lighting brightness intelligent detection system. The system fixes 5 illuminance sensors in a vehicle-mounted manner to achieve continuous measurement of longitudinal measurement points on the tunnel road surface and synchronous measurement of lateral measurement points; a programmable light source installed outside the tunnel provides a controllable brightness input for the dimming system, and uses the LoRa wireless technology completes the long-distance wireless communication with the inspection vehicle, which can realize the analysis and management of the measurement data. The whole system is convenient, efficient and intelligent, which can be applied to highway tunnel lighting quality monitoring and operation management.

A smart sound and light anomaly monitoring system for highway tunnels based on Internet of Things technology was studied to address the issues of highway tunnel lighting systems. By utilizing Internet of Things technology, the tunnel lighting system is combined with abnormal sound recognition. Through the design of algorithm models, the recognition of abnormal sound inside the tunnel and the intelligent control of the lighting system is achieved. By pruning and validating the hidden layer nodes of the model, a more streamlined abnormal sound recognition model is obtained. Through experimental verification, this model has the highest recognition accuracy among all models, with a recognition rate of 91.75% at a compression rate of 20%. Compared with Average Percentage of Zeros (APoZ), Random Pruning and Mean Activation, the recognition rate is increased by 2.64%, 1.47% and 1.40%, respectively. In the design of tunnel lighting, fuzzy control is applied to the lighting inside the tunnel to improve the driving safety of drivers and further reduce the power consumption of excessive lighting in the tunnel. Through experiments, it has been proven that the system can work well, saving up to 727[Formula: see text] of energy per day.

Analysis of threshold values of contrast revealing coefficient in highway tunnel lighting