EP4285351A1 - Fahrzeugerfassungssystem - Google Patents
FahrzeugerfassungssystemInfo
- Publication number
- EP4285351A1 EP4285351A1 EP21703187.1A EP21703187A EP4285351A1 EP 4285351 A1 EP4285351 A1 EP 4285351A1 EP 21703187 A EP21703187 A EP 21703187A EP 4285351 A1 EP4285351 A1 EP 4285351A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- detection system
- vehicle detection
- sensor
- energy store
- energy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
- B60L53/66—Data transfer between charging stations and vehicles
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
- B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F11/00—Road engineering aspects of Embedding pads or other sensitive devices in paving or other road surfaces, e.g. traffic detectors, vehicle-operated pressure-sensitive actuators, devices for monitoring atmospheric or road conditions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/52—Discriminating between fixed and moving objects or between objects moving at different speeds
- G01S13/56—Discriminating between fixed and moving objects or between objects moving at different speeds for presence detection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/86—Combinations of radar systems with non-radar systems, e.g. sonar, direction finder
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/91—Radar or analogous systems specially adapted for specific applications for traffic control
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/027—Constructional details of housings, e.g. form, type, material or ruggedness
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0108—Measuring and analyzing of parameters relative to traffic conditions based on the source of data
- G08G1/0116—Measuring and analyzing of parameters relative to traffic conditions based on the source of data from roadside infrastructure, e.g. beacons
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0125—Traffic data processing
- G08G1/0133—Traffic data processing for classifying traffic situation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/003—Transmission of data between radar, sonar or lidar systems and remote stations
Definitions
- the invention relates to a vehicle detection system for monitoring stationary and moving vehicles.
- Vehicle detection systems for detecting or guiding vehicles are also well known from the patent literature, both for moving and for stationary traffic.
- So-called traffic guidance systems or parking guidance systems serve to draw the attention of vehicle drivers to detours, for example in places with high traffic density, or to guide them to parking spaces with free capacity in agglomerations.
- Vehicle detection systems of this type can include ground sensors which register when a vehicle is approaching or driven over and then forward corresponding information to a control system.
- ground sensors can be wired for their energy supply or for their communication with a control system, which means that when installing such ground sensors, in addition to anchoring them to the ground, lines for the power supply and communication must also be laid, which involves a corresponding amount of effort in terms of Installation time and installation material is connected.
- modern vehicle detection systems are set up with ground sensors, which can carry out one-way communication or two-way communication with a control system via radio signals and also have their own power supply.
- Such ground sensors then only require their own installation at a desired location on traffic routes or parking lots. It is important for vehicle detection systems that they are designed for the respective purpose. Vehicle detection systems that are intended for detecting stationary traffic are typically not suitable for the much more complex detection of moving traffic.
- EP 3 543 984 A1 (Its light technik solutions AG) describes a vehicle detection system or a floor sensor for monitoring stationary as well as moving traffic.
- the system includes an occupancy sensor for detecting a vehicle, an energy store, a microprocessor and a communication module, the energy store being able to be supplied with energy from an RF energy converter by means of RF transmission energy.
- solar cells Also mentioned for feeding are solar cells, Peltier elements and RF charging pumps.
- the occupancy sensor can be designed as a PIR sensor (motion detector), radar sensor, pressure sensor, magnetic field sensor, ultrasonic sensor or as a capacitive, inductive or optical sensor. PIR sensors are particularly advantageous. Batteries or supercapacitors (supercaps) are mentioned as energy storage devices. Voltage monitoring is also shown, which allows early detection of faults in the feed of the floor sensor and, if necessary, the switching on or off of one or more feeds.
- a disadvantage of such a vehicle detection system is that a relatively high transmission power is required in order to supply the energy store with sufficient energy via the RF energy converter. This can be problematic depending on the installation situation of the system.
- the optional solar cells and Peltier elements mentioned for additional supply can supply additional energy, but their performance is heavily dependent on the weather.
- RF charge pumps which are also a way to To supply energy storage with energy, on the other hand, requires manual intervention directly at the installation site, which is time-consuming and undesirable, especially on busy roads.
- Another problem is that if the energy storage system malfunctions, the entire vehicle detection system fails and is no longer able to provide data. Accordingly, such as well as other known vehicle detection systems must be checked and serviced at relatively short intervals in order to ensure trouble-free operation. This is particularly undesirable in roadway-integrated vehicle detection systems since the roadway must be opened for maintenance to gain access to the vehicle detection system.
- the object of the invention is therefore to provide a vehicle detection system which is designed to detect moving traffic, enables vehicles to be detected as precisely as possible and requires as little maintenance as possible.
- the core of the invention is therefore a vehicle detection system for monitoring stationary and moving vehicles with a housing, a first sensor and a second sensor, each for detecting vehicles, a control unit and a first energy storage device and a second energy storage device, which independently of one another supply the vehicle detection system with electrical energy can supply, wherein the control unit is designed such that the first sensor is permanently switched on during operation of the vehicle detection system and the second sensor is only switched on for a predetermined time when the first sensor has detected a possible vehicle.
- the control unit is also designed in such a way that when the voltage of the first energy storage device falls below a first predetermined voltage, the vehicle detection system is supplied with electrical energy by the second energy storage device. In other words, the vehicle detection system has two separate energy stores, which can supply the system with energy independently of one another.
- the vehicle detection system In normal operation, the vehicle detection system is supplied with energy via the first energy store. Because the control unit monitors the first energy store, it can detect any faults at an early stage and ensure the energy supply via the second energy store without interruption. This ensures that the vehicle detection system can be supplied with energy even in the event of a short-term or long-term fault in the first energy store.
- the vehicle detection system is designed such that the first sensor is permanently switched on during operation of the vehicle detection system and the second sensor is only switched on for a predetermined time when the first sensor has detected a vehicle. This enables a particularly energy-efficient and precise detection of both moving and stationary vehicles. With such a two-stage sensor system, the vehicle detection system can therefore be operated in a particularly energy-saving manner without having to make any compromises in the detection accuracy.
- the first sensor While the first sensor is permanently switched on during operation of the vehicle detection system, it preferably carries out a measurement at regular intervals, in particular at a frequency of more than 50 Hz, for example 50-200 Hz, in particular 100 Hz.
- the second sensor is advantageously switched on within less than 10 milliseconds, in particular less than 1 millisecond, in particular less than 0.5 milliseconds, preferably less than 0.1 milliseconds, after the first sensor has detected a vehicle. This ensures that moving vehicles can be precisely detected even at higher speeds.
- the service life of the second sensor can be significantly extended by the two-stage sensor system according to the invention, which means that the vehicle detection system's susceptibility to faults can be reduced overall. If, for example, a first sensor is combined, which is less problematic in terms of wear a more wear-intensive sensor, an extremely long service life of the sensor system can be achieved.
- a vehicle detection system which has a particularly long service life and correspondingly long maintenance intervals.
- the two-stage sensor system it is possible to design the control in such a way that if one of the two sensors fails, the vehicle detection system continues to be operated with the functional sensor. Under certain circumstances, this can lead to increased energy consumption and/or reduced precision during detection. However, a total failure of the vehicle detection system can be prevented or at least greatly delayed.
- the vehicle detection system is therefore advantageously not designed to use transmission energy, in particular RF transmission energy, to supply or charge an energy store.
- the vehicle detection system does not have an RF energy converter for supplying or charging an energy storage device.
- such energy converters can still be used for special applications.
- the first and the second sensor are in particular an infrared sensor, an ultrasonic sensor, a laser-based sensor, a microwave-based sensor, a magnetic field sensor, a Hall sensor and/or an induction loop for vehicle detection.
- the first sensor and the two th sensor are different sensors, in particular sensors which are based on different technologies.
- the first sensor is a magnetic field sensor and the second sensor is a microwave-based sensor, in particular a radar sensor.
- the magnetic field sensor is a Hall sensor, for example.
- this sensor combination can be operated in a particularly energy-saving manner and at the same time a high level of precision can be achieved in vehicle detection.
- This is probably related to the fact that magnetic field sensors can very reliably detect the presence of a vehicle, regardless of the type. Both compact vehicles with low-lying chassis and trucks with high-lying chassis can be reliably detected.
- the magnetic field sensor is therefore suitable as a reliable trigger for activating the second sensor.
- the microwave-based sensor which is preferably provided as the second sensor
- a so-called primary signal is emitted as a bundled electromagnetic wave and the echoes reflected by objects are received as a secondary signal. From this, for example, the distance to the vehicle, its speed and/or length can be determined.
- a microwave-based sensor provides extremely precise data on the moving vehicles.
- microwave-based sensors can be activated in a very short time, which is crucial for detecting vehicles traveling at high speeds.
- the combination of magnetic field sensor and microwave-based sensor, in particular a radar sensor, has proven to be particularly advantageous in comparison with other sensor combinations for most areas of application of the vehicle detection system.
- other sensor combinations can also be advantageous for special applications.
- the control unit is preferably designed in such a way that: a) the first sensor carries out a measurement at regular intervals, in particular at a frequency of more than 50 Hz, for example 50-200 Hz, in particular 100 Hz; b) compares the measurement data with a predefined sensor threshold value; c) a measurement algorithm starts when a measured value is above the predefined sensor threshold value, d) the measurement algorithm, in particular if the measurement data determined with the first sensor meet a predefined condition, activates the second sensor and carries out at least one measurement; e) the measurement data determined with the first and/or with the second sensor are evaluated by the control unit, so that one or more measurement variables are obtained; f) Wherein the second sensor is preferably switched off after each measurement and is only reactivated when required for
- the predefined condition in step d) can be, for example, a minimum length of time that the sensor threshold value has been exceeded. However, completely different conditions can also be predefined.
- the start of the measurement algorithm in step c), the activation of the second sensor and the implementation of the at least one measurement in step d) take place in particular within less than 10 milliseconds, in particular less than 1 millisecond, in particular less than 0.5 milliseconds, preferably less than 0.1 milliseconds, after comparing the threshold in step b).
- Step f) increases the energy efficiency of the vehicle detection system, in particular if the first sensor is a magnetic field sensor and the second sensor is a microwave-based sensor, for example a radar sensor.
- the first sensor comprises two separate magnetic field sensors, which can be operated alternatively. This means that if one magnetic field sensor fails, the other magnetic field sensor can be used.
- the controller is preferably designed in such a way that if the first magnetic field sensor fails, the system automatically switches to the second magnetic field sensor.
- the first and the second energy store are, in particular, each an electrical energy store.
- the first energy store is particularly preferably a chargeable energy store, in particular a capacitor and/or a first accumulator.
- a capacitor in particular a supercapacitor, is particularly preferred.
- a supercapacitor is in particular a double-layer capacitor.
- Capacitors can be charged and discharged much faster than accumulators. In addition, they tolerate more switching cycles than accumulators and are therefore particularly suitable for the vehicle detection system according to the invention.
- the first energy store can also be a battery that cannot be recharged.
- the vehicle detection system preferably has at least one charging element which is designed to charge the first energy store and optionally also the second energy store. It is particularly preferred if both the first and the second energy store can be charged by the at least one charging element.
- the at least one charging element is a solar cell, an induction loop and/or a Peltier element.
- the first energy store and/or the second energy store in particular an accumulator and/or a capacitor, can be charged by the charging element.
- the first energy store, and optionally also the second energy store can be charged automatically at times of sufficient tanning. peltie elements are known per se. If there is a temperature difference, they generate a current flow due to the Seebeck effect.
- the Peltier element is preferably coupled to the solar cell via a thermally conductive thermal bridge. This is because solar modules heat up when they are exposed to the sun and a larger, electrically usable temperature delta is therefore available for the Peltier element than if this were arranged separately from the solar cell.
- the first energy store and optionally also the second energy store, can be charged by external magnetic fields.
- the vehicle detection system has an induction loop, preferably in the form of an induction coil, with which external sources of interference, e.g. from electric vehicles, can be used to generate energy.
- the second energy store is particularly preferably an accumulator or a battery. If the first energy store is also an accumulator or a battery, the second energy store is an additional accumulator or an additional battery. In other words, in this case there are at least two separate accumulators or batteries.
- the first energy store is an accumulator and/or a capacitor, preferably a capacitor, more preferably a supercapacitor;
- the second energy store is an accumulator or a battery
- the at least one charging element includes a solar cell, optionally in combination with a Peltier element;
- the first sensor is a magnetic field sensor
- the second sensor is a microwave-based sensor, in particular a radar sensor.
- the control unit is designed in such a way that when the voltage of the first energy storage device falls below a first predetermined voltage, the vehicle detection system is supplied with electrical energy by the second energy storage device. In this case, the energy supply via the first energy store is preferably completely prevented.
- the control unit is preferably designed in such a way that it switches on either the first energy storage device or the second energy storage device for the energy supply, but not both energy storage devices at the same time.
- control unit is designed in such a way that it continuously monitors the voltage of the first energy store and, if the voltage falls below the first predetermined voltage, supplies the vehicle detection system with energy via the second energy store.
- the first predetermined voltage can also be referred to as the first threshold value.
- the current voltage of the second energy source serves as the first predetermined voltage or as the first threshold value. In other words, in this case the vehicle detection system is supplied by the second energy store when the voltage of the first energy store is lower than the voltage of the second energy store.
- the vehicle detection system is automatically supplied with energy via the second energy store in the event of a fault in the first energy store, e.g. in the event of a defect, discharge or the like.
- control unit is designed in such a way that when a second predetermined voltage of the first energy store is exceeded, the vehicle detection system is supplied by the first energy store.
- the current voltage of the second energy source serves as the second predetermined voltage or as the second threshold value. In other words, in this case the vehicle detection system is supplied by the first energy store when the voltage of the first energy store is higher than the voltage of the second energy store.
- the control unit automatically switches back to the first energy store.
- the vehicle detection system then works again in normal operation and is completely supplied with energy by the first energy store.
- the control unit is particularly preferably designed in such a way that:
- the vehicle detection system has a communication interface, in particular a wireless communication interface.
- the communication interface is particularly preferably a bidirectional communication interface.
- data from the vehicle detection system can be sent to a higher-level communication device, e.g. a gateway and/or a control system.
- the data can be, for example, measured variables, data on the status of the vehicle detection system, error information and/or maintenance information. In this way, the status of the individual components of the vehicle detection system can be monitored remotely. If, for example, one of the two sensors fails or if the voltage of one of the energy storage devices drops unexpectedly, appropriate measures can be taken.
- data can also be transmitted to the vehicle detection system remotely, for example from a control system and/or from a gateway.
- This makes it possible, for example, to reprogram and/or reparameterize the control unit and/or other components of the vehicle detection system. This without having to physically access the installation site Vehicle detection system must be accessed.
- the control unit can be reprogrammed in such a way that if one of the two sensors fails, the vehicle detection system continues to operate with the functional sensor. It is also possible to adapt or optimize the sensor sensitivities to the conditions present at the installation site of the vehicle detection system.
- control unit is preferably designed in such a way that the two sensors can be switched on and off via the bidirectional communication interface, the sensor sensitivities can be adjusted and/or the measurement algorithm can be changed.
- a wireless communication interface includes, for example, a radio, a Bluetooth and/or a WLAN communication interface. However, other communication interfaces can also be used.
- the housing of the vehicle detection system preferably has a side wall, preferably a cylindrical wall, and a top and bottom surface.
- Cylindrical vehicle detection systems can be installed reliably and in a space-saving manner in corresponding circular-cylindrical roadway recesses, e.g. boreholes in the roadway, which is extremely efficient. In principle, however, differently shaped housings can also be used.
- the top surface of the housing preferably consists at least partially of a light-transmitting material, preferably glass, in particular single-pane safety glass. This makes it possible to place a solar cell and/or a light-sensitive sensor in the housing.
- the housing has a base surface that protrudes beyond the lateral wall.
- the bottom surface has a larger circumference than the lateral wall, in particular the cylindrical wall.
- the housing can be better anchored in the recesses in the road, so that the vehicle detection system cannot be easily levered out under mechanical and/or thermal loads.
- rib-like projections running in the vertical direction and projecting outward are attached to the housing. This can prevent the sensor from twisting after installation in a roadway.
- the bottom surface has at least one, preferably several, recesses and/or at least one, preferably several, openings.
- the at least one recess and/or the at least one passage are preferably present in the areas of the base plate that protrude beyond the lateral wall. This simplifies the casting of the vehicle detection system in the roadway recesses, since the casting compound can flow under the vehicle detection system through the recesses and/or openings when the vehicle detection system is inserted.
- the alignment of the vehicle detection system during installation can be realized with an installation aid.
- the installation aid can be, for example, a support element that can be placed on the road surface in the area next to the road recesses, to which the vehicle detection system can be temporarily attached.
- the sensor can be optimally embedded in the road surface without being too low or protruding over the road surface. The latter would be a problem when clearing snow, for example, and would lead to unnecessary additional mechanical stress when driving over it.
- the housing preferably has mounting receptacles, via which the vehicle detection system can be mechanically connected to the installation aid during installation.
- the bottom surface, top surface and lateral wall are connected to one another in a materially bonded manner.
- a particularly good seal can thus be achieved, so that the components of the vehicle detection system are protected as best as possible from the effects of the weather.
- the vehicle detection system must be completely removed in the event of a defect and the material connection must be released.
- the cover surface is detachably connected to the side wall, in particular screwed.
- the cover surface can be removed relatively easily, giving access to the individual components. ten of the system. Defective parts, such as the control unit and/or a piece of glass, can thus be replaced without great effort, which reduces the duration of the associated lane closure to a minimum.
- the housing has a pressure compensation device. This can be avoided that in changing weather conditions, e.g.
- At least one passage in particular a continuous bore, is preferably present in the housing as the pressure compensation device.
- the at least one passage is preferably designed as an air-permeable and at the same time liquid-impermeable connection between the outside and inside of the housing.
- the at least one passage is closed with an air-permeable and liquid-impermeable membrane.
- FIG. 1 shows a block diagram of a vehicle detection system according to the invention in the form of a floor sensor with a magnetic field sensor and a radar sensor;
- FIG. 2 shows a block diagram of a further floor sensor according to the invention which has two redundant magnetic field sensors
- FIG. 3 shows a perspective view of the housing of the floor sensor from FIG. 1 ;
- FIG. 4 shows a schematic representation of the installation situation after the floor sensor from FIG. 3 has been cast into a recess in a roadway.
- the vehicle detection system is in the form of a ground sensor 1 housed in a housing 10 (see Figure 3 for housing details).
- the floor sensor 1 has a first sensor 6.1 in the form of a magnetic field sensor (Hall sensor) and a second sensor 6.2, which is a radar sensor.
- a supercapacitor is present as the first energy store 4.1, while the second energy store 4.2 is present in the form of an accumulator.
- the two energy stores 4.1, 4.2 can be supplied with electricity and charged via a charging element 3, in the present case a solar cell, when light L shines on it.
- the floor sensor 1 also includes a central control unit 2, which has a computing unit, a data memory and multiple interfaces for data exchange with the other components of the floor sensor and for power supply.
- the two sensors 6.1, 6.2 are connected to the control unit via communication lines.
- Unit 2 is connected, while the two energy stores 4.1, 4.2 are connected to the control unit via supply lines.
- the control unit 2 is designed in such a way that: when the voltage of the first energy store 4.1 falls below the voltage of the second energy store 4.2, the floor sensor or its components are supplied with electrical energy by the second energy store 4.2 and when the voltage of the first energy store 4.1 falls again above the voltage of the second energy store 4.2 increases, the floor sensor or its components are supplied by the first energy store 4.2.
- control unit 2 is designed in such a way that: a) the first sensor 6.1 carries out a measurement at regular intervals, in particular at a frequency of 100 Hz; b) compares the measurement data with a predefined sensor threshold value; c) a measurement algorithm starts when a measured value is above the predefined sensor threshold value, d) the measurement algorithm, provided that the measurement data determined with the first sensor 6.1 meet a predefined condition, activates the second sensor 6.2 and carries out at least one measurement; e) The measurement data determined with the two sensors 6.1, 6.2 are evaluated by the control unit 2, so that one or more measurement variables are obtained; f) The second sensor 6.2 is switched off after each measurement and is only activated again when required for a new measurement.
- the start of the measurement algorithm in step c), the activation of the second sensor and the implementation of the at least one measurement in step d) take place, for example, within less than 1 millisecond after the comparison of the threshold value in step b).
- the control unit 2 is also connected to a communication module 7, which enables bidirectional data exchange via appropriate radio signals F with a gateway or a control center (not shown) via a wireless connection, for example a radio network.
- the controller 2 shows a second floor sensor 1', in which there is another magnetic field sensor 6.1a of identical construction in addition to the first sensor 6.1.
- the controller 2 is additionally designed in such a way that if the first magnetic field sensor 6.1 fails, the system automatically switches to the second magnetic field sensor 6.1a.
- the floor sensor 1' also has a further charging element 3a in the form of a Peltier element, which makes thermal energy W usable for charging the supercapacitor.
- the Peltier element is in physical contact with the solar cell or the first charging element 3.1 via a thermal bridge 8 that conducts well.
- the first energy store 4.1 or the supercapacitor can thus also be charged via the Peltier element.
- the floor sensor 1' has a non-rechargeable battery as the second energy store 4.2'. Accordingly, the battery is not connected to the charging elements 3.1, 3.1a.
- the other components of the floor sensor 1' are identical in construction to the respective components of the first floor sensor 1.
- Fig. 3 shows a perspective view of the housing 10 of the floor sensor 1 from FIG rests on the side wall 12 and is fixed by a fastening ring 13b.
- the fastening ring is detachably connected to the side wall 12 by a total of six screws 14 .
- a pressure compensation device 15 in the form of a hole closed by an air-permeable and water-impermeable membrane is introduced into the fastening ring.
- the first charging element 3 in the form of the solar cell is attached directly below the glass plate 13a inside the housing 10 (not visible in FIG. 3), the remaining components are located underneath.
- the base surface 11 projects beyond the side wall 12 in the lateral direction or the base surface 12 has a larger circumference than the side wall 12.
- the base sensor 1 can thus be cast into a road surface 20 in a form-fitting manner, e.g. with a casting compound 21 become what is shown in FIG.
- the second energy store 4.2 in FIG. 1 can be a non-rechargeable battery instead of an accumulator.
- the second energy store 4.2' in FIG. 2 can be present in the form of an accumulator instead of in the form of a non-chargeable battery.
- the translucent glass plate 13a in the embodiment from FIG. 3 can also be glued directly to an inner and lowered shoulder of the side wall 12, so that there is a non-detachable connection.
- rib-like projections 11b running in the vertical direction can be provided, which protrude from the side wall 12 of the housing and secure it against rotation.
- the floor surfaces 1 1, 1 1 'do not necessarily have to be flat as shown in Fig. 3. It is also possible for these to have a curved or corrugated surface. It is also possible for the bottom surfaces 11, 11' to be angled upwards or downwards at the edge regions, while the central region is flat, for example. Likewise, the housing from FIG. 3 can also be cuboid instead of cylindrical.
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- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Power Engineering (AREA)
- Analytical Chemistry (AREA)
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Abstract
Description
Claims
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2021/052182 WO2022161627A1 (de) | 2021-01-29 | 2021-01-29 | Fahrzeugerfassungssystem |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4285351A1 true EP4285351A1 (de) | 2023-12-06 |
Family
ID=74550626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21703187.1A Pending EP4285351A1 (de) | 2021-01-29 | 2021-01-29 | Fahrzeugerfassungssystem |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20230406141A1 (de) |
| EP (1) | EP4285351A1 (de) |
| WO (1) | WO2022161627A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2037379B1 (en) * | 2024-04-02 | 2025-10-13 | Koninklijke Bam Groep Nv | Road sensor assembly, method of mounting such an assembly, and method of replacing the road sensor of such an assembly |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10152223A1 (de) * | 2001-10-13 | 2003-04-17 | Gerhard Bosch | System zur Fahrzeugerfassung |
| US6914411B2 (en) * | 2003-05-19 | 2005-07-05 | Ihs Imonitoring Inc. | Power supply and method for controlling it |
| US7339347B2 (en) * | 2003-08-11 | 2008-03-04 | Reserve Power Cell, Llc | Apparatus and method for reliably supplying electrical energy to an electrical system |
| WO2010069002A1 (en) * | 2008-12-19 | 2010-06-24 | Park Assist Pty Ltd | Method, apparatus and system for vehicle detection |
| DE102015202782A1 (de) * | 2015-02-17 | 2016-08-18 | Robert Bosch Gmbh | Verfahren zum Betreiben einer Sensorvorrichtung und Sensorvorrichtung |
| US10153650B2 (en) * | 2015-12-15 | 2018-12-11 | Intel Corporation | Energy harvesting system for IoT devices |
| CN106781534A (zh) * | 2017-01-03 | 2017-05-31 | 安徽嘉盛位联网络科技有限公司 | 一种泊位车检器及检测方法 |
| EP3543984A1 (de) | 2018-03-20 | 2019-09-25 | Its Light Technic Solution AG | Fahrzeugerfassungssystem |
-
2021
- 2021-01-29 WO PCT/EP2021/052182 patent/WO2022161627A1/de not_active Ceased
- 2021-01-29 EP EP21703187.1A patent/EP4285351A1/de active Pending
- 2021-01-29 US US18/272,106 patent/US20230406141A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022161627A1 (de) | 2022-08-04 |
| US20230406141A1 (en) | 2023-12-21 |
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