EP-4736924-A1 - A TRAIN CABIN SYSTEM FOR FATIGUE MANAGEMENT

EP4736924A1EP 4736924 A1EP4736924 A1EP 4736924A1EP-4736924-A1

Abstract

A train cabin lighting system for managing the fatigue of a train operator comprises a cabin interior configured to accommodate the operator during operation. The system includes a light-emitting apparatus arranged within the cabin, which comprises at least one light source capable of emitting light at different wavelengths. A control unit is operatively connected to the light-emitting apparatus, and it is configured to control the emission of light based on predefined protocols. The system is characterized by the light-emitting apparatus being configured to emit blue light at a wavelength between 460 nm and 480 nm. Additionally, an adaptive lighting control system dynamically adjusts one or more of the intensity, spectral composition, and emission angle of the light based on real-time feedback from environmental and operator-specific conditions, thereby managing the operator's fatigue.

Inventors

VAN DER POEL, LEX JOSEPHUS MARIA

Assignees

Dual Inventive Holding B.V.

Dates

Publication Date: 20260506
Application Date: 20251105

Claims (15)

A train cabin lighting system for fatigue management of a train operator, comprising: a cabin interior configured to accommodate a train operator during operation; a light-emitting apparatus arranged within the cabin, said apparatus comprising at least one light source capable of emitting light in different wavelengths; a control unit operatively connected to the light-emitting apparatus, configured to control the emission of light based on predefined protocols; characterized by the light-emitting apparatus being configured to emit blue light at a wavelength between 460 nm and 480 nm; and an adaptive lighting control system that dynamically adjusts one or more of the intensity, spectral composition, and emission angle of the light, based on real-time feedback from environmental and operator-specific conditions, to manage the operator's fatigue.
The train cabin lighting system according to claim 1, wherein the adaptive lighting control system adjusts the intensity of the light in a range from 50 to 1000 lux, more preferably from 200 to 600 lux, and even more preferably from 300 to 500 lux.
The train cabin lighting system according to claim 2, wherein the intensity adjustment is based on real-time feedback from ambient light sensors.
The train cabin lighting system according to claim 1, wherein the adaptive lighting control system adjusts the spectral composition of the light between 435 nm and 500 nm, more preferably between 450 nm and 480 nm, and most preferably between 460 nm and 470 nm.
The train cabin lighting system according to claim 4, wherein the light-emitting apparatus is configured to emit blue-enriched light with a correlated color temperature (CCT) of 6300K or higher.
The train cabin lighting system according to claim 1, wherein the adaptive lighting control system dynamically adjusts the emission angle of the light, more preferably between 20 and 90 degrees, and most preferably between 30 and 60 degrees.
The train cabin lighting system according to claim 6, wherein the emission angle is adjusted based on the operator's seating position detected through a sensor.
The train cabin lighting system according to claim 1, further comprising a feedback system that monitors operator-specific physiological conditions, including heart rate variability, blink rate, or eye movement, to control the emission of light in real time.
The train cabin lighting system according to claim 8, wherein the physiological feedback is used to adjust the duration and intensity of blue light exposure.
The train cabin lighting system according to claim 1, wherein the adaptive lighting control system adjusts the duration of blue light emission in cycles, with each cycle lasting between 10 and 60 minutes, more preferably between 15 and 45 minutes, and most preferably between 20 and 30 minutes.
The train cabin lighting system according to claim 10, wherein the lighting system provides intermittent blue light exposure interspersed with periods of natural light to minimize circadian disruption.
The train cabin lighting system according to claim 1, further comprising a predefined illumination protocol that includes one or more of a predefined duration, pulse shape, duty cycle, intensity, wavelength, or lux of the illuminated light.
The train cabin lighting system according to claim 12, wherein the illumination protocol adjusts automatically based on the operator's shift schedule, providing more intense blue light during early night shifts and reducing exposure toward the end of the shift.
The train cabin lighting system according to claim 1, wherein the light-emitting apparatus is configured to emit photons at a wavelength between 435 nm and 500 nm, more preferably between 450 nm and 480 nm, and most preferably between 460 nm and 470 nm.
The train cabin lighting system according to claim 1, wherein the light-emitting apparatus is arranged for diffusion of light onto a respective eye of the rail worker, ensuring even distribution of light across the operator's visual field.

Description

Technical field The present invention relates to a train cabin system, specifically designed to manage operator fatigue by utilizing controlled light emission. Background In modern railway operations, the role of the train operator is critical for the safe and timely transport of passengers and goods. Train operators are often required to maintain high levels of concentration and alertness over extended periods, particularly during night shifts or long-distance routes. While various systems are in place to assist operators, such as automated train control systems and external alert mechanisms, the issue of operator fatigue remains a significant challenge. Fatigue impairs cognitive function, slows reaction times, and increases the likelihood of human error, which can have serious consequences in high-risk environments such as rail transport. Current fatigue management solutions in the railway industry primarily focus on scheduling adequate rest periods between shifts, implementing safety protocols, and utilizing in-cabin alarms to alert operators in critical situations. Additionally, some efforts have been made to introduce personal fatigue-management tools, such as wearable devices and fatigue-detection systems that monitor physiological signals like eye movement or head nodding. However, these systems are reactive rather than preventative, only alerting operators after fatigue has already impacted their performance. This approach does not address the underlying issue of maintaining consistent alertness, especially during prolonged night shifts or during periods of reduced natural light. The limitations of these existing solutions are evident in their inability to actively influence an operator's alertness before signs of fatigue become dangerous. Alarms and alerts are often disruptive, startling operators instead of helping them maintain a steady level of concentration. Furthermore, wearable fatigue detection devices can be uncomfortable or intrusive, limiting their widespread adoption. Additionally, none of these solutions take into account the natural circadian rhythm of operators, which is a key factor in managing fatigue, particularly during night-time operations. In recent years, advancements in lighting technology, specifically the development of LED-based systems, have enabled new possibilities for manipulating light spectra and intensities in ways that could enhance alertness and cognitive performance. Blue-enriched white light, generally characterized by color temperatures of 6300K or higher, has gained significant attention across various industries for its potential to improve alertness and reduce subjective sleepiness during night work. Scientific studies have demonstrated that exposure to blue-enriched light can lead to faster reaction times, improved alertness, and reduced fatigue, particularly in controlled environments such as laboratories and some field settings. This has led to considerations for implementing blue-enriched lighting in train cabins as a countermeasure for managing fatigue among rail workers and train operators. However, the application of blue-enriched light in these settings presents several notable drawbacks. Firstly, exposure to high-intensity blue light, especially during night shifts, can interfere with the body's natural circadian rhythms by suppressing melatonin production. This disruption can result in long-term sleep issues and other health risks for workers who frequently operate during nighttime hours. Secondly, blue-enriched light has been linked to increased eye strain and visual discomfort, which could impair the visual acuity necessary for performing safety-critical tasks in railway operations. A further concern is the impact of altered lighting conditions on the perception of essential visual and vital information, such as railway signs and signals, both within the cabin and along the track. Color perception under blue-enriched lighting can be distorted, making it more difficult to accurately distinguish critical visual cues. This could potentially lead to the misinterpretation of signals or delayed recognition of important information, thereby compromising safety. Additionally, studies have shown that while blue-enriched light can enhance subjective feelings of alertness, it does not always correspond to improved performance in precision tasks. In some cases, exposure to blue-enriched light has even been found to impair accuracy, which is particularly concerning in train operations that demand precise control and decision-making. Moreover, the effectiveness of blue-enriched light can vary between individuals, presenting challenges in creating a standardized solution that benefits all workers equally. This variability further complicates the practical implementation of such lighting systems in train cabins, where consistency in performance and safety is paramount. Thus, while the use of blue-enriched lighting has shown promise in certain contexts, its appli