• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:SE0950623A1
    申请号:SE0950623
    申请日:2009-09-01
    公开日:2011-03-02
    发明作者:Mats Riehm
    申请人:Mats Riehm；
    IPC主号:
    专利说明:

    15 20 25 30 2 The observance of these two temnodynamic principles gives a model of the temperature of the road surface while a freezing process of a liquid on the road surface is in progress. The delayed nucleation leads to the water being temporarily cooled, but after the freezing process begins, the temperature rises rapidly to the freezing point. Theoretically, the water can reach a temperature colder than - 40 ° C with a freezing point of 0 ”C. This is only possible in extremely clean and calm water under laboratory conditions. Nevertheless, even on road surfaces, subcooling at fl your degrees has been observed.
    Frozen liquid on a road surface is sometimes referred to as black ice. It is not really black but transparent, which makes it look black due to the asphalt. Unlike hoarfrost or snow, black ice is much harder to detect and resembles a wet wave. Knowing where and when black ice has formed is important information for both road users and maintenance personnel who can use chemicals, e.g. salt, to lower a freezing point temperature of liquid on a road surface and to avoid the formation of ice.
    US5416476 and US2002 / 0075141 disclose a system and a device, respectively, which are vehicle-mounted and measure a temperature of the road surface on which each vehicle travels. US'476 and WO'141 do not disclose detection of freezing of a liquid on a road surface.
    US5313202 discloses a method and a device for detecting icing of stretcher surfaces.
    The temperature of different parts of a bearing surface is measured. The temperature of the different parts is compared and if a temperature difference is detected, ice growth is considered to have been detected.
    US6456200 discloses a device for indicating icing on a surface. A temperature difference is measured by a sensor in the form of a peltier element recessed in a road surface. A circular metal plate on an upper side of the device is at the same level as the upper part of the road surface. The device can actively heat and melt an ice layer on the metal plate. No actual freezing point temperature is determined.
    WO03 / 044508 discloses an active street coating sensor module provided with a sample well, in which a Peltier cooler is arranged. Freezing of a liquid collected in the sample well is determined. 10 15 20 25 30 3 A system called Fensor ® developed by Saab / Combitech / Saab Technologies uses a peltier element for active heating and cooling of a liquid collected in a depression in a road surface to determine a freezing point for the liquid in the depression. A sensor head is arranged at the bottom of the recess.
    The latter three prior art technologies, as shown in US'200 and WO'508 and the Frensor ® system, operate by utilizing a sensor in direct contact with liquid (or ice). Thus, heat transfer must take place between liquid (or ice) and a respective sensor for a change in liquid temperature to be sensed by the respective sensor. In themselves, therefore, these systems affect the freezing process because a certain mass of the sensor must assume a temperature of the liquid (or ice). Furthermore, these technologies work intermittently because ice is melted and liquid is allowed to freeze again, or is actively frozen again. In addition, freezing a liquid on the metal plate, or in the sample well or well, is not the same as detecting freezing on a road surface.
    Freezing conditions on the metal plate, in the sample well or in the depression differ from freezing conditions on a road surface. Thus, these technologies do not provide information about a liquid on an actual road surface on which vehicles are traveling.
    SUMMARY An object of the invention is to provide reliable information on the freezing of a liquid on a road surface.
    According to one aspect of the invention, the object is achieved by a system for detecting freezing of a liquid on a road, which utilizes a release of latent heat from the liquid. The system includes a sensor for measuring a road temperature, and a processor connected to the sensor. The processor is intended to monitor temperature changes over time measured by the sensor. The sensor comprises a measuring means arranged above and at a distance from a part of the road surface for continuously measuring a surface temperature over the part of the road surface. The processor is intended to determine the release of latent heat as an increase in the surface temperature corresponding to a differential ratio between the surface temperature and time and the differential ratio exceeding a threshold value. Since the measuring means is arranged above and at a distance from the part of the road surface, reliable temperature nets are made of the road surface and freezing of a liquid on the actual road surface is detected. The freezing of a liquid on an actual road surface is detected, i.e. do not freeze a liquid collected in a recess or freeze a liquid on a metal plate. As a result, the above-mentioned object is achieved in a simple and reliable manner.
    According to exemplary embodiments, the part of the road surface is located in an area of a wheel track in the road. In this way, the measuring means can be directed towards the road surface where vehicles travel and thus, freezing of a liquid on the road surface as such, on which vehicles travel, can thus be detected. A wheel track is a part of the road where the vehicle's left or right wheels touch, and travel on, the road surface.
    According to exemplary embodiments, the processor may be intended to recognize the increase if the surface temperature or an ambient temperature is below a threshold temperature. In this way, sudden temperature rises which occur at non-freezing temperatures will not be recognized as the freezing of a liquid.
    According to exemplary embodiments, the processor may be intended to determine whether said increase has a duration of at least a minimum time period. In this way, temperature increases due to, for example, passing vehicles such as freezing of a liquid are not recognized.
    According to exemplary embodiments, the processor is intended to determine an actual freezing point temperature of a liquid on the part of the road surface determined by prevailing conditions affecting the liquid on the part of the road surface. Knowledge of the freezing point temperature can be used for many purposes. For example, the freezing point temperature can be used to decide if chemical treatment of the road surface to lower the freezing point temperature is necessary. For example, the processor may be intended to determine the actual freezing point temperature as a temperature reached after the increase. The liquid will essentially maintain the freezing point temperature for a period of time after the increase. According to exemplary embodiments, the measuring means may be an infrared thermometer. The infrared thermometer will provide contactless measurements of the surface temperature in a reliable and cost-effective way.
    According to an exemplary embodiment, a cooling element can be arranged below at least a part of said part of the road surface and the processor can be connected to the cooling element for controlling the cooling element. In this way, the part of the road surface can be actively cooled under the control of the process and thus the freezing point temperature of the liquid can also be determined when ambient temperatures are above the freezing point temperature of the liquid.
    According to exemplary embodiments, the processor may be intended to communicate the actual freezing point temperature to a receiver. Such a receiver may be a road maintenance vehicle or a weighing information station. Other examples could be a general warning road sign or a monitoring station for road maintenance or a road vehicle.
    According to one aspect of the invention, there is provided a method for detecting freezing of a liquid on a road which utilizes a release of latent heat from said liquid wherein: - a road temperature is measured, - changes in the road temperature are monitored over time, - the road temperature is a surface temperature continuously measured over a part of the road surface, - the surface temperature is measured from above and at a distance from the part of the road surface, and - the release of latent heat is determined as an increase of the surface temperature corresponding to a differential ratio between the surface temperature and time and the differential ratio exceeding a threshold value.
    According to exemplary embodiments, the increase can be recognized if the surface temperature or an ambient temperature is below a threshold temperature.
    According to exemplary embodiments, the method may include determining whether the increase has a duration of at least a minimum time period. According to exemplary embodiments, the method may include determining an actual freezing point temperature of a liquid on the part of the road surface, determined by prevailing conditions affecting the liquid on the part of the road surface.
    According to exemplary embodiments, the actual freezing point temperature can be determined as a temperature reached after the increase.
    According to exemplary embodiments, the method may include that at least a portion of the portion of the road surface is actively cooled.
    Additional features of, and advantages of, the present invention will become apparent when the appended claims and the following description are studied.
    Those skilled in the art will recognize that various features of the present invention may be combined to create embodiments other than those described below without departing from the scope of the present invention as defined by the appended claims.
    BRIEF DESCRIPTION OF THE DRAWINGS The various aspects of the invention, including its particular features and advantages, will be readily understood from the following detailed description and the accompanying drawings, in which: Fig. 1 shows a system for detecting freezing of a liquid on a road surface. according to exemplary embodiments, and Fig. 2 shows the freezing of a liquid on a part of a road surface.
    DETAILED DESCRIPTION The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments are shown. However, this invention should not be construed as limited by the embodiments expressed herein.
    Demonstrated features of exemplary embodiments may be combined which are readily understood by those skilled in the art in the field to which the invention belongs. The same number referred to the same element throughout. 10 15 20 25 30 7 As used herein, the "comprising" or "included" fields are open and include one or more of the indicated features, elements, steps, components or functions but do not exclude the presence or addition of one or more additional features, elements, steps. , components, functions or groups thereof.
    As used herein, the term "and / or" includes any or all combinations of one or more of the accompanying listed items.
    As used herein, the common abbreviation "eg", which comes from the Latin phrase "exempli grantia", can be used to introduce or specify a general example or example of a previously mentioned item, and is not intended to be limiting of such item. . If used herein, the common abbreviation "i.e.", which comes from the Latin phrase "id est", can be used to specify a particular entry from a more general enumeration.
    The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limited to the invention. As used herein, the singular forms "en", "ett" and "den / det" are intended to include plural forms as well, unless the context clearly indicates otherwise.
    Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which the invention belongs. It is further to be understood that terms, such as those fi nienated in commonly used dictionaries, shall be construed as having a meaning consistent with their meaning in the context of the relevant technical art and shall not be construed in an idealized or excessively formal manner unless expressly so fi niered herein.
    It should be understood that when an element is referred to as “connected” or “connected” to another element, it may be directly connected or connected to the other element or intermediate elements may also be present. However, when an element is referred to as "directly connected" or "directly connected" to another element, there are no intermediate elements present. 10 15 20 25 30 8 Well-known functions and constructions may not be described in detail in exchange for consistency and / or clarity.
    Fig. 1 shows a system 2 for detecting freezing of a liquid on a road surface 4 according to exemplary embodiments. The system comprises a sensor comprising a measuring means in the form of an infrared (IR) thermometer 6 arranged on a post 8 next to a road, the road surface 4 of which is to be monitored with respect to the freezing of liquid.
    The liquid on the road surface 4 may be water or brine containing water and a chemical for treating the road to prevent freezing of water on the road surface, e.g. salt (NaCl). In the case of water only on the road surface, it is generally known that the freezing point temperature of water is 0 ° Celsius. However, on roads that are treated with chemicals during cold seasons to lower the freezing point temperature of the liquid on the road, the freezing point temperature is unknown, especially if a certain time has elapsed since a road section was treated. By means of the system according to the present invention, freezing of a liquid on a road surface 4 can be detected, and according to certain exemplary embodiments, the freezing point temperature can be determined.
    The IR thermometer 6 is directed towards a part 10 of a road surface so that the IR thermometer 6 can measure the temperature of the part 10 of the road surface or a liquid which at least partially covers the part 10 of the road surface. The part 10 of the road surface may be located in an area of the road where vehicles travel, such as an area for a wheel track. The part 10 of the road surface may have an area of about 20 square centimeters or may have another area, e.g. within the range of 5 - 30 or 1 - 50 square centimeters. Too large an area can make it difficult to determine a sudden increase in fluid temperature.
    The IR thermometer 6 is connected to a processor or data collector arranged in a box 12 on said post 8. The processor is intended / programmed to use an algorithm for detecting freezing of a liquid on the part of the road surface, see below. The processor may be connected to an active road sign 14, a warning sign which is lit when a freezing of a liquid (formation of ice) is determined by the system 2. The active road sign may be located some distance before the IR thermometer 6, e.g. 1 kilometer. The processor can the alternative, or also. be connected to a monitoring station for Road Maintenance, e.g. a switchboard from which road maintenance vehicles are routed. Such a monitoring station may alternatively be a device mounted in a road maintenance vehicle. The processor can also be connected to a warning system, which draws the attention of vehicle drivers, e.g. via a GPS receiver; on icing on a relevant stretch of road. In an alternative embodiment, the processor is arranged at a location other than the IR thermometer 6. In this case, the box 12 may contain communication equipment for communicating temperature seals from the IR thermometer 6 to the processor.
    The processor can receive temperature readings from more than one measuring means. Either your IR thermometers 6 can be arranged on the post 8 and directed towards different parts of the road surface of a stand or measuring means, e.g. IR thermometers at various locations send their temperature networks to a centrally located processor.
    System 2 can be installed as part of an existing WiS, (see below regarding VViS station). This can have the advantage that the same processor or data collector can be used for other WiS functions and the system according to the present invention, and that no new location needs to be prepared. The IR thermometer feeds the data collector with a signal that is analyzed. In the event of an ice alarm, a message is sent to a decision support system used by maintenance personnel along with traditional data such as wind, air temperature and humidity which are normally measured at a WiS station. Staff may receive either a freezing point message or a freezing alarm, i.e. ice formation. System 2 can alternatively be installed separately from an existing WiS station.
    Below the part 10 of the road surface, a cooling element can be arranged to actively cool the part 10 of the road surface to determine a freezing point temperature of a liquid even when the ambient temperature is above the freezing point temperature of the liquid. The cooling element is controlled by the processor.
    Fig. 2 shows the freezing of a liquid on a part of a road surface. The curve shows how the temperature of the liquid changes as measured by a measuring means arranged above the road surface. First, the temperature drops gradually until it reaches 2 degrees Celsius, at which point freezing of the liquid begins and its temperature increases rapidly to the prevailing freezing point of the liquid, -0.5 degrees Celsius. The liquid remains at this temperature until all the liquid has frozen. Thereafter, the temperature of the ice continues to fall. Embodiments of the freezing detection system include a contactless thermometer, e.g. an IR thermometer (infrared thermometer), and a processor connected to the thermometer. The processor is programmed with a detector algorithm. The processor may include or may be connected to a memory. The memory can be used to store e.g. the detector algorithm. The processor and memory can alternatively be called a data collector.
    According to exemplary embodiments, the system may comprise a cooling element, e.g. a Peltier element was sold forming an active system. The cooling element can be mounted below the road surface in order to be able to cool the road surface above the cooling element. It is to be understood that "below the road surface" also includes cooling elements embedded in a pavement (eg asphalt or coarse asphalt) only the cooling element is covered by the pavement. The cooling element is connected to the processor and is controlled by the processor. Thus, the processor can use the cooling element to cool the road surface above the cooling element to a temperature below its current temperature given by ambient conditions. Thus, the freezing point temperature can be determined even before it has been reached naturally. The processor may be programmed to cool the asphalt until its liquid then freezes. The actual freezing moment can be detected by the IR thermometer and a freezing point temperature can be calculated. This can ensure that an actual freezing point temperature is determined before the liquid on the asphalt freezes naturally. With the cooling element, the system can be considered active in the sense that the cooling element actually freezes a liquid on a part of the road surface. If the cooling element is switched off, the system could be considered passive and be able to detect ice that is formed naturally and can only calculate a freezing point temperature when freezing occurs.
    According to exemplary embodiments, a passive system without the cooling element can provide sufficient information for many applications. In this case, the road surface does not need to be manipulated.
    According to exemplary embodiments, the system could be integrated into or associated with existing road measuring stations, commonly referred to as "Road Weather Information Systems" (WiS). At present, a representative WiS measures temperature and humidity but cannot indicate icing. Alternatively, the system for detecting a freezing of a In the latter case, it should be noted that the vehicle must be stationary to use the detector algorithm, since detection of freezing of a liquid on a road surface according to the present invention must be performed on a liquid or a vehicle. part of a road surface 10 15 20 25 30 11 A passive system can be upgraded to an active system by adding a cooling element.The IR thermometer and the black ice detector algorithm are used in both the active and passive systems.
    The IR thermometer can have a time resolution of 0.5 - 50 Hz, e.g. a time resolution of 10 Hz can be used. It can be connected to a data collector in the WiS station where the black ice detector system can be integrated. Alternatively, a stand-alone system can be built with a data collector that only handles the IR thermometer. This can be useful if stand-alone systems will be installed more frequently than existing WiS stations, for example at bridges or other areas exposed to ice formation.
    The data collector with the algorithm software may be remotely located, i.e. the data collector is located in a place other than the IR thermometer. The main reason for using a data collector near the IR thermometer is that the continuous temperature measurements do not need to be communicated, instead the temperature measurements can be analyzed on site and signals can be sent to other places or devices e.g. in case of ice detection or to communicate freezing point temperature values. With a sufficiently high data transfer rate, a remote data collector can be realized.
    According to exemplary embodiments, an IR thermometer of the brand Quixote Surface Patrol model 999J can be used. It works well measured from a static position.
    The signal from the IR thermometer is sent to a data collector where an algorithm analyzes the signal in a directly connected manner. The IR thermometer signal is interpreted by a detector algorithm. The algorithm specifies a few conditions for the signal that may correspond to a freezing moment. Preferably, the algorithm may be insensitive to disturbances such as passing traffic. The fundamental basis of the algorithm is the calculation of the differential ratio between surface temperature and time, AT / At. To exclude sudden disturbances of the temperature signal, such as traffic, from being interpreted as freezing, At is set to a constant value k, (seconds) longer than the time step used, e.g. longer than 0.1 second in the case of temperature measurements at 10 Hz. The size of k, is a matter of optimization where too small values will trigger alarms in situations that are not related to the freezing process. k, can for example be set to a value of 10 seconds or 20 seconds or even 90 seconds. Other values can also be used, e.g. 10 15 20 25 30 12 during experiments, a value of k, = 30 seconds has shown good performance for detecting ice with few incorrect detections. An excessively large k, would make the algorithm less sensitive to changes and miss freezing times, sold k, can be seen as a sensitivity parameter for the system.
    The ratio is calculated for each step of the signal, which means that the algorithm runs ten times per second in the case where a 10 Hz signal is used. For the algorithm to detect a freezing moment, the differential ratio must exceed a predetermined threshold value, Tdw.
    The basic condition for freezing then becomes: ëwrag, H: rr> k fl ta fl n.
    A high threshold value can exclude the most slow climate-dependent variations of the surface such as heating from solar radiation. The algorithm may also include a condition that requires a number, n, of n + m calculated ratios to be above the threshold value, Tdw, to ensure that temporary erroneous temperature values affect the detection of icing on a portion of a road surface. Tdth, can be determined at a location for a system for detecting freezing or a fixed value can be set, e.g. to Tdm, = 1/60 ° C / second.
    Other values of Tdth, can alternatively be used, e.g. within the range 1/120 to 1/20 ”C / second.
    In order to avoid that disturbances at higher temperatures are incorrectly interpreted as freezing times, the road surface temperature or ambient temperature may be required to be below a maximum value of Tma,. Tmax can be, for example, 0.5 ° C, 5 ° C or 10 ° C or some other suitable temperature, which gives: IP m "r» kpwra fl n. AND "refrmax THEN: Fælïi (1) Where [F] is a vector that saves time for freezing occasions.
    The algorithm described so far is sufficient, for example, to control information that ice has formed into active road signs or otherwise indicate that ice has formed. To provide information about a freezing point temperature of a liquid on a road surface, e.g. 10 15 20 25 30 13 for road maintenance personnel, the system must also save the freezing points. Since the freezing point temperature (Tf) occurs after freezing has started and while both liquid and solid liquid are present, this will correspond to the highest temperature reached after the freezing process has started. The vector saved in equation (1) can then be extended to: [F] = Lä] where Tf = maxu fi - lzoytrw 300)) (2) In this example, Tf will be the highest temperature reached 120 seconds before the freeze is registered to 300 seconds later, the algorithm looks for the highest temperature instead of the instantaneous temperature. Time limits other than 120 seconds and 300 seconds can of course be used to define an interval, during which the highest Tf has been registered. For example, the time limit before freezing (sudden increase in surface temperature) can be set to 0 minutes and the time limit after freezing can be selected within the interval 20 - 180 seconds.
    A freezing point temperature may alternatively be defined as a temperature within a temperature range of a temperature reached at the end of the sudden increase of the road temperature, e.g. a range of 1 degree Celsius.
    Equation (2) can be used in an active system with a cooling element. The system will then cool the road surface with the cooling element until it freezes. Freezing point temperature will be saved. The set freezing point temperature can be used by maintenance personnel to evaluate whether more brine is needed or whether the latest application is still effective. If the ambient and / or road surface temperature approaches the freezing point temperature, the cooling element can be switched off to use the system in the same way as the passive system without the cooling element to detect freezing on the road surface caused by a natural drop in ambient temperature.
    According to exemplary embodiments, a method for detecting freezing can be described which uses the following steps: - Read an input value corresponding to the temperature of the road surface. 10 15 20 25 30 14 - Compare the value with the value registered 30 seconds earlier.
    - If the temperature has risen rapidly (faster than Td, h,) and if the temperature is below 0.5 ° then save the time as a freezing event.
    ~ Look for the highest temperature a time interval before and after the freezing event.
    - Register this temperature as the freezing point.
    If an active system is used, the cooling element can be activated fl once per hour, e.g. 2- 10 times / hour: According to exemplary embodiments, the system may comprise: - An IR thermometer - The detection algorithm - A cooling element - A processor or data collector for data processing, running algorithm and sending out icing information, i.e. information for warning signs, road maintenance personnel, car navigators, etc.
    The cooling element can be a Peltier element in an aluminum cylinder. The element needs a 12V voltage. The aluminum cylinder would be embedded in the road and connected to a power supply. An active system can detect freezing point temperatures at any time compared to a passive system where a freezing point can be calculated after a natural freezing event.
    According to exemplary embodiments, a major application of the system may be to monitor a road network to detect icing and estimate at least one freezing point temperature. The system can either be integrated in one or more of your WiS stations or installed as a standalone system. Other applications may include ice detection on runways at g yards, the terms road, road surface and part of the road surface shall in this context be interpreted as a runway, runway surface or part of the runway. According to exemplary embodiments, the system can make it possible to assess when and at what temperature freezing actually occurs. The system can consequently enable safer roads with fewer accidents. In addition, the system can enable more efficient and optimized road maintenance because the results of road treatment with de-icing and anti-icing can be monitored if they have had any impact. This will lead to less salt being used, fewer trucks deployed for road treatment and thus cost savings, environmental benefits and safer roads.
    According to exemplary embodiments, the increase in temperature can be used as an indicator of ice formation and thus enables the detection of ice that is formed, for example on a road.
    The phenomenon of an increasing temperature of the freezing water-ice mixture can be measured with a sufficiently high resolution. During field observations, the increase in temperature has lasted for about 30 - 90 seconds. Thus, as part of a criterion, a duration of the increase can be chosen to be e.g. 10, 20, 30 or 40 seconds. The temperature can be measured ten times every second to be sure to capture the sudden temperature changes. However, the temperature can be measured with a different frequency, e.g. 1 Hz or 3 Hz. The measurement requires a thermometer of a kind that does not resist rapid changes in the environment, i.e. a classic thermometer probe will have a mass that must adapt to the environment to represent the true temperature. This effect will even out rapid temperature changes. An IR thermometer that measures infrared radiation from the part of the road surface without any contact does not suffer from this effect. This contactless method of measuring temperature makes it possible to capture rapid temperature changes. The concept of making high-frequency measurements with a contactless thermometer makes it possible to observe rapid temperature changes that occur during the course of freezing of a liquid on the part of the road surface.
    According to exemplary embodiments, the proposed system can monitor the portion of the road surface and can detect rapid temperature changes that indicate that a liquid is freezing and ice formation was sold. Consequently, the proposed system can warn maintenance personnel and road users of slippery road conditions. To do this, the high frequency temperature signal can be analyzed by a real-time algorithm. The algorithm detects patterns of the temperature signal that may correspond to a freezing event and triggers an alarm when freezing occurs. The alarm may, for example, contain three types of information: the time of the alarm, the location of the IR tennometer in question and the freezing point of the surface which corresponds to a temperature reached during the freezing process.
    Compared to existing technologies for detecting ice on a road surface, the present system has the advantage of being simple and inexpensive. The passive version requires no modification or installations on the road surface, no traffic will be obstructed and the IR thermometer is small enough not to interfere with road surfaces. The present system can offer a low cost option that can be installed in many places. If active road signs are used with the system, these signs can replace passive signs.
    A commercially interesting application of exemplary embodiments may be to install a large number of sensors in a road network of a country or region of a country to inform road maintenance personnel of the time and place of freezing events. The information may also include freezing point temperatures at different locations. Optionally, detected icing can be discharged via active road signs.
    Those skilled in the art will appreciate that exemplary embodiments may be combined.
    Although the invention has been described with reference to exemplary embodiments, many different changes, modifications and the like will be apparent to those skilled in the art.
    Therefore, it is to be understood that the foregoing illustrates various exemplary embodiments and is not to be limited to particular embodiments shown, and that modifications of the embodiments shown, combinations of features of illustrated embodiments as well as other embodiments are intended to be included within the scope of the appended claims.
    权利要求:
    Claims (1)
    [1]
    A system (2) for detecting the freezing of a liquid on a road which utilizes a release of latent heat from said liquid, the system comprising a sensor for measuring a road temperature, and a processor connected to said sensor and intended to monitor temperature changes over time measured by said sensor, characterized in that said sensor comprises a measuring means arranged above and at a distance from a part (10) of the road surface to continuously measure a surface temperature over said part (10). ) of the road surface, and wherein said processor is intended to determine said release of latent heat as an increase of said surface temperature corresponding to a differential ratio between said surface temperature and time and said differential ratio exceeding a threshold value. The system (2) of claim 1, wherein said processor is for recognizing said increase if said surface temperature or an ambient temperature is below a threshold temperature. The system (2) according to any one of claims 1 and 2, wherein said processor is intended to determine if said increase has a duration of at least a minimum time period. The system (2) according to any one of the preceding claims, wherein said processor is intended to determine an actual freezing point temperature of a liquid on said part (10) of the road surface determined by prevailing conditions affecting said liquid on said part (10) of the road surface. The system (2) according to claim 4, wherein said processor is intended to determine said actual freezing point temperature as a temperature reached after said increase. The system according to any one of the preceding claims, wherein said measuring means is an infrared thermometer (6). The system (2) according to any one of the preceding claims, wherein a cooling element is arranged below at least a part of said part (10) of the road surface and said processor is connected to said cooling element for controlling said cooling element. The system (2) according to any one of claims 4 and 5, wherein said processor is intended to communicate said actual freezing point temperature to a receiver. The system (2) according to claim 8, wherein said receiver is one of a general warning road sign (14) or a monitoring station for Road Maintenance or a road vehicle. A method for detecting freezing of a liquid on a road which utilizes a release of latent heat from said liquid wherein: a road temperature is measured, changes in said road temperature are monitored over time, said road temperature is a surface temperature continuously measured over a part of the road surface, surface temperature is measured from above and at a distance from said part of the road surface, and said release of latent heat is determined as an increase of said surface temperature corresponding to a differential ratio between said surface temperature and time and said differential ratio exceeding a threshold value. The method of claim 10, wherein: said increasing is recognized if said surface temperature or an ambient temperature is below a threshold temperature. The method according to any one of claims 10 and 11, wherein: it is determined whether said increase has a duration of at least a minimum time period. The method according to any one of claims 10 to 12, wherein: an actual freezing point temperature of a liquid on said part of the road surface, determined by prevailing conditions affecting said liquid on said part of the road surface, is determined. The method of claim 13, wherein: said actual freezing point temperature is determined as a temperature reached after said increase. The method of any one of claims 10 to 14, wherein: at least a portion of said portion of the road surface is actively cooled.
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    同族专利:
    公开号 | 公开日
    EP2290630A1|2011-03-02|
    SE533943C2|2011-03-08|
    引用文献:
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    法律状态:
    2013-04-30| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE0950623A|SE533943C2|2009-09-01|2009-09-01|Method and system for detecting the freezing of a liquid on a road|SE0950623A| SE533943C2|2009-09-01|2009-09-01|Method and system for detecting the freezing of a liquid on a road|
    EP10173604A| EP2290630A1|2009-09-01|2010-08-20|Method and system for detecting freezing of a liquid on a road|
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