WO2013075373A1

WO2013075373A1 - Saturation traffic determination method and device

Info

Publication number: WO2013075373A1
Application number: PCT/CN2011/084184
Authority: WO
Inventors: 李瑾; 朱中; 李月高; 陈晓明; 王志明
Original assignee: 青岛海信网络科技股份有限公司
Priority date: 2011-11-21
Filing date: 2011-12-19
Publication date: 2013-05-30
Also published as: CN102509456A; CN102509456B

Abstract

A saturation traffic determination method and device, relating to the field of intelligent transportation and used for realizing automatic measurement and calculation of saturation traffic values. The method includes: collecting pulse data output by a detector provided at an approach of a signal crossing; counting the time headway at the approach according to the collected pulse data; and determining a saturation traffic value according to the counted time headway.

Description

Method and apparatus for determining saturation flow rate. The present application claims priority to Chinese Patent Application, filed on November 21, 2011, the entire disclosure of which is hereby incorporated by reference. In this application. Technical field

The present invention relates to the field of intelligent transportation, and in particular, to a method and apparatus for determining a saturated flow rate. Background technique

The saturation flow value is an important parameter for the timing design and capacity study of the signal intersection. It refers to the maximum traffic flow value that can pass during the green light signal time when there is a long queue of vehicles waiting at the entrance of the signal intersection. Represented by the number of vehicles passing through the effective green time per hour.

The saturation flow value is constant under certain road conditions and vehicle conditions. However, in actual conditions, road conditions and vehicle conditions are not the same, so the saturation flow values are not the same. There are many factors affecting the saturation flow value, except for the relative traffic flow, lane position and width, traffic composition, the proportion of turning vehicles in the mixed driving lane, and the slope of the inlet road, which have significant effects on the saturation flow value.

At present, the saturation flow value is obtained by using the field observation method. A large number of personnel are observed to observe the intersection on site, record the relevant parameters, and then process the observation data to obtain the saturated flow value. The automatic calculation of the saturated flow value has not yet been achieved. Program. Summary of the invention

Embodiments of the present invention provide a method and apparatus for determining a saturated flow rate, which are used to implement an automatic measurement scheme for a saturated flow rate value.

A method for determining a saturated flow rate, the method comprising:

Collecting pulse data of a detector output at an entrance path of the signalized intersection; the detector is configured to detect whether there is a vehicle at the inlet lane in real time, and the pulse data is data for indicating a detection result;

Counting the headway distance at the inlet lane based on the pulse data collected by the stack; the headway distance represents a time when the vehicle exists at the inlet lane and a previous moment when the vehicle exists at the inlet lane Time difference

The saturation flow value is determined according to the statistically obtained headway time interval, and the saturated flow rate value is the maximum traffic flow value that can be passed during the green light signal time when there is a vehicle waiting in the entrance lane.

A device for determining a saturated flow rate, the device comprising:

a collection statistics module, configured to collect pulse data of a detector output at an entrance lane of a signalized intersection; the detector is configured to detect in real time whether a vehicle exists at the inlet lane, and the pulse data is used for Indicates test results Data; according to the pulse data collected by the enthalpy, the headway distance at the inlet lane is counted; the headway time interval indicates the moment when the vehicle exists at the inlet lane and the previous one of the vehicles at the inlet lane Time difference between times;

The saturation flow determining module is configured to determine a saturated flow value according to the statistically obtained headway time interval, wherein the saturated flow rate value is a maximum traffic flow value that can pass through the green light signal time when there is a vehicle waiting at the inlet lane.

In the solution, the pulse data of the detector output at the entrance of the signal intersection is set; the time interval of the head at the entrance channel is counted according to the pulse data collected by the ;; the time interval of the head is determined according to the statistics Saturated flow value, it can be seen that the present invention realizes an automatic measurement scheme of the saturated flow value. DRAWINGS

FIG. 1 is a schematic flowchart of a method according to an embodiment of the present disclosure;

2A is a schematic flow chart of calculating a vehicle head time interval according to an embodiment of the present invention;

2B is a schematic view showing a detector placed at an entrance duct according to an embodiment of the present invention;

2C is a schematic structural diagram of a device in an embodiment of the present invention;

2D is a schematic diagram of a data measurement module in an embodiment of the present invention;

2E is a schematic flowchart of measuring a saturated flow rate according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a device according to an embodiment of the present invention.

detailed description

In order to achieve an automatic measurement scheme of the saturation flow, the embodiment of the present invention provides a method for determining a saturated flow rate. In the method, the head time interval is calculated according to pulse data output by a detector disposed at an entrance of a signalized intersection, and The saturation flow value is determined based on the statistically obtained headway time. The detector used in the present invention may be any detector capable of detecting the presence of an object.

Referring to FIG. 1 , a method for determining a saturated flow rate according to an embodiment of the present invention includes the following steps.

Step 10: collecting pulse data of a detector output at an entrance path of the signalized intersection; the detector is configured to detect in real time whether a vehicle exists at the entrance lane, and the pulse data is data for indicating a detection result; According to the pulse data collected by the ,, the headway distance at the entrance lane is counted; the headway distance represents the time difference between the moment when the vehicle exists at the entrance lane and the last moment when the vehicle exists at the entrance lane; The first time when there is a vehicle at the entrance lane, the corresponding headway time interval can be zero.

Step 11: Determine the saturation flow value based on the statistically obtained headway distance. The saturated flow value is the maximum traffic flow value that can pass during the green light signal time when there is a vehicle waiting in the entrance lane.

As shown in FIG. 2A, the specific implementation of step 10 can be as follows:

A, set the value of the counter to 0; B. A pulse time length pulse data output by the detector;

C. Determine whether there is a vehicle at the entrance time according to the pulse data of the current set, and if so, store the time interval corresponding to the current time, and the stored time of the front head is the value of the current counter and a pulse time. The product of the length, and returns to step A; if not, the value of the counter is incremented by 1, and the process returns to step B.

Of course, the specific implementation of step 10 is not limited to the above manner, and any scheme capable of counting the headway interval based on the pulse data output by the detector is within the protection scope of the present invention.

In step 10, the pulse data output by the detector can be collected within a set time length, for example, the pulse data output by the detector within 24 hours of the collection. The collection frequency can be a pulse length of time, such as 20 milliseconds.

The specific implementation of step 11 can be as follows:

First, the head time interval in the preset time interval of the saturated head is selected from the statistically obtained head time interval; the saturated head time interval is composed of a plurality of saturated head time subranges; for example, the saturation The time interval of the front is divided into N equal parts, then each aliquot is a saturated headway sub-interval; the unit of the headway is the unit representing the time, the time interval of the saturated front, and the sub-interval of the saturated head. The unit of the upper limit value and the lower limit value is also a unit indicating time. For example, the unit of the headway time is seconds, and the unit that constitutes the saturated headway interval interval and the upper head limit and the lower limit value of the saturated headway time interval may also be seconds.

Then, for each of the saturated head-to-head interval sub-sections, determining the number of headway intervals in the sub-interval of the saturated head, and the average of the head-to-head distances in the sub-interval of the saturated head; The value can be an arithmetic mean or a weighted average.

Next, according to the determination result, P saturated heads are selected from a plurality of saturated head time sub-intervals; P is a positive integer not greater than the total number of sub-intervals of the saturated head;

Then, determining the average value of the average value of the headway time interval corresponding to the sub-interval when the selected P saturated heads are selected, and using the final average value as the saturated headway time interval; the average value may be an arithmetic mean value or a weighted average value Wait;

Finally, the saturation flow value is determined based on the determined saturation headway time interval. For example, the saturated flow value = saturated headway distance /V, the value of V is determined according to the unit of the headway time interval. When the unit of the headway is in seconds, the value of V is 3600, and the unit of the time at the head is minute. In the case of V, the value of V is 60, and when the unit of the headway is hour, the value of V is 1.

According to the determination result, P saturated head positions are selected from a plurality of saturated head time sub-intervals, and the specific implementation can be as follows:

For each saturated headway time interval sub-interval in a plurality of saturated head-to-head intervals, calculate the number of head-to-head intervals corresponding to the sub-intervals from the consecutive P-saturated heads from the saturated head-to-head interval The sum value, select the P sum of the saturated heads corresponding to the largest sum value. Here, when there are a plurality of maximum sum values, a maximum sum value may be randomly selected, and then P saturated head-to-head sub-intervals corresponding to the finally selected maximum sum value are selected. P is a positive integer not greater than the total number of sub-intervals at the time of saturation of the head. The value of P needs to ensure that the calculated number of totals is greater than a certain threshold. For example, the threshold is 1. Preferably, when the new headway time interval in the interval between the saturation heads is counted, according to the new headway time interval, when the head position in the sub-interval is located at the time of the saturated head of the new headway The number of distances and the average of the headway distances in the sub-intervals of the saturated heads at the time of the new head are updated. For example, the number of headway distances in the sub-interval from the saturated head in the new head is originally n, and the time of the head in the sub-interval at the time of the saturated head of the new head is The average value is that the new headway is ^Χ "+ι , then the number of updated headways is η+1, and the average of the updated headway distance - ^nx 3⁄4 +' ^x a÷i

― ^ ^ Ί ^.

In this method, the saturation headway interval interval can be (1.0, 5.0), and the saturated headway interval interval is composed of the following 40 saturated headway time interval subranges: (1.0,1.1], (1.1,1.2], (1.2,1.3 ], (1.3,1.4], (1.4,1.5], (1.5,1.6], (1.6,1.7], (1.7,1.8], (1.8,1.9], (1.9,2.0], (2.0, 2.1], (2.1, 2.2], (2.2,2.3], (2.3,2.4], (2.4,2.5], (2.5,2.6], (2.6,2.7], (2.7,2.8], (2.8,2.9], (2.9 , 3.0], (3.0, 3.1], (3.1, 3.2], (3.2, 3.3], (3.3, 3.4], (3.4, 3.5], (3.5, 3.6], (3.6, 3.7), (3.7, 3.8 ], (3.8, 3.9], (3.9, 4.0], (4.0, 4.1], (4.1, 4.2], (4.2,4.3), (4.3,4.4], (4.4,4.5], (4.5,4.6], (4.6, 4.7], (4.7, 4.8], (4.8, 4.9), (4.9, 5.0]; P has a value of 10.

The present invention will be described below in conjunction with specific embodiments:

First, the apparatus used in this embodiment includes a detector and a saturation flow determining device, wherein:

The detector is placed at the entrance of the signalized intersection 30 meters from the stop line, as shown in Figure 2B. Saturated flow rate The position of the device can be set arbitrarily.

The detector detects in real time whether or not there is a vehicle at the entrance lane and outputs pulse data indicating the detection result. The saturation flow determining device collects the pulse data outputted by the detector, counts the headway distance at the inlet track based on the pulse data collected by the enthalpy, and determines the saturated flow value according to the statistically obtained headway time interval. Determining a frequency saturation pulse flow data collector means preclude the detector output may be 20 ms / views, the set data for accuracy preclude ^10-2.

The architecture of the saturation flow determining device is shown in Figure 2C. The device uses an advanced system architecture, the CPU is ATMEL9260, and the operating system is embedded Linux. Memory management is mainly implemented by the embedded Linux Memory Management Unit (MMU). The determined saturation flow value and the like are stored in the internal memory (NAND FLASH) in a file format, and the data is not lost within 10 years after the power is turned off. The external communication interface of the saturation flow determining device has a serial port (RS232), a network port, etc., and the device can be restarted by a watchdog or the like.

Specifically, the saturation flow determining device includes a physical layer, a system layer, an intermediate layer, and an application layer in order from bottom to top; an embedded Linux operating system runs in the system layer; the middle layer includes a serial port driver, a network port driver, and a universal serial bus. (Universal Serial Bus, USB) / Secure Digital (SD) driver, bus driver, General Purpose Input Output (GPIO) driver and Real Time Chip (Real Time Chip, The application layer includes a data measurement module, a program upgrade module, a timer module, a data storage module, a communication processing module, and a running log module, where:

As shown in FIG. 2D, the processing flow of the data calculation module is: collecting the pulse data output by the detector, counting the time interval of the headway at the entrance track according to the pulse data collected by the ,, and determining the saturation flow according to the statistically obtained headway time interval. value.

The data measurement module can also provide the determined saturation flow value to the data storage module and the communication processing module. The data storage module stores the saturated flow value. The communication processing module can output the saturated flow value stored by the data storage module.

The timer module is used to control the data calculation module to collect the pulse data output by the detector according to a certain frequency. Program The upgrade module is used to implement the upgrade function of the program installed at the application layer. The running log module is used to record the log information of the application layer, and the communication processing module can also output the log information for manually analyzing the running state of the device.

The flow of the data measurement module to measure the saturated flow value is shown in Figure 2E:

Step 1: Set the pulse data output from the detector at the entrance of the signal intersection, and calculate the headway distance at the entrance path based on the pulse data collected by the signal, which is recorded as the unit in seconds and i is the vehicle count.

Step 2: The time interval of the head in the time interval of the preset saturated head is selected from the calculated time intervals of each of the heads;

Here, the pre-set minimum headway interval is (0,1.0), and the saturated headway interval is: (1.0,1.1], (1.1,1.2], (1.2,1.3], ..., (4.8, 4.9] , (4.9,5.0]; The interval between unsaturated heads is: (5.0 +∞);

Among them, the interval of (0,1.0) belongs to the minimum front time interval, and there is almost no data in the actual detection, which is negligible. The interval of (5.0, + ∞ ) belongs to the unsaturated headway time interval, and the data required by this method is the saturated front head. Time interval, so the (5.0, +∞) interval is also ignored.

Step 3: Determine and record the number n of the headway distances in the sub-interval of the saturated head, and the sub-intervals in the saturated headway time interval for each saturated headway time interval that constitutes the saturated headway time interval interval. Inside the front of the car n

X two one

The average of the distances is: ^{π κ} ;

When a saturated head is added to the time interval data from the sub-interval, the recorded data is updated to:

El 1; 3⁄4÷ι;

^{3⁄4a÷1 =} ^ n' + i ';

Step 4: Calculate the sum of the n values corresponding to the subintervals of the 10 consecutive saturated heads from the sub-interval of the saturated head, for each of the saturated heads in the 40 saturated heads. Value, select the 10 saturated head-to-head interval corresponding to the largest sum value; that is, calculate the 1-10th saturated headway time interval The sum value N1 of the corresponding n value, the sum value N2 of the n value corresponding to the subinterval of the 2-11th saturated headway, and the sum value N3 of the n value corresponding to the subinterval of the 3-12th saturated headway, according to In this way, until the 31-40th saturated head is calculated, the sum value N31 corresponding to the sub-interval is calculated, and then 10 saturated heads corresponding to the maximum values of N1, N2, N3, ..., N31 are selected. Time interval subinterval;

Step 5: Calculate all the average values corresponding to the sub-intervals of the selected 10 saturated heads to get the saturated car ii―

X = > — ^

When the head]? Giant X, namely: 3⁄4 ^1β ;

Step 6: Calculate the saturation flow V, ie: V=3600/X.

The beneficial effects of this embodiment include:

The saturation flow determining device provided in this embodiment can count the headway distance data of all vehicles; without manual observation, the device can automatically calculate the saturated flow value. At the same time, the saturated flow value obtained by manual observation is obtained based on the data recorded during the manual observation, and the device can recalculate the saturated flow value as the headway distance data increases. The device can store historical data and can communicate data through serial port or network port.

Referring to FIG. 3, an embodiment of the present invention further provides a device for determining a saturated flow rate, where the device includes:

The statistic module 30 is configured to collect pulse data of a detector output at an entrance path of the signalized intersection; the detector is configured to detect whether a vehicle exists at the inlet lane in real time, and the pulse data is used Data indicating the detection result; counting the headway distance at the inlet lane based on the pulse data collected by the enthalpy; the vehicle head time interval indicating the presence of the vehicle at the inlet lane and the presence at the inlet lane The time difference between the last moments of the vehicle;

The saturation flow determining module 31 is configured to determine a saturated flow value according to a statistically obtained headway time interval, where the saturated flow value is a maximum traffic flow value that can pass during a green light signal time when a vehicle is waiting in line at the inlet lane. .

The collection statistics module 30 is configured to: perform the following steps A-step C:

A, set the value of the counter to 0;

B. Collecting pulse data of a pulse length of time output by the detector;

C. determining, according to the pulse data of the set, whether there is a vehicle at the entrance time at the current time, and if present, storing a time interval corresponding to the current time of the head, and storing the value of the front time of the head is the value of the current counter and a value The product of the length of the pulse time, and returns to step A; if not, the value of the counter is incremented by 1, and the process returns to step B.

The saturation flow determination module 31 is configured to:

The time interval of the head in the pre-set saturated headway time interval is selected from the statistically obtained headway time interval; the saturated headway time interval interval is composed of a plurality of saturated headway time interval subintervals;

For each saturated head-to-head interval, determining the number of headway intervals in the sub-interval of the saturated head, and the average of the headway in the sub-interval of the saturated head; According to the determination result, P saturated heads are selected from the plurality of saturated head time subintervals; P is a positive integer not greater than the total number of sub-intervals of the saturated head;

Determining an average value of the average values of the head time intervals of the P saturated heads from the sub-intervals, and determining the average value as the saturated headway time interval;

A saturation flow value is determined based on the saturated headway time interval.

The saturation flow determination module 31 is configured to:

Calculating, for each of the plurality of saturated head-to-head intervals, each of the saturated head-to-head interval sub-sections, calculating a time interval of the heads corresponding to the sub-intervals of the consecutive P saturated heads from the saturated head-to-head interval The sum of the numbers, the P sum of the heads of the saturated heads corresponding to the largest sum value is selected.

The saturation flow determining module 31 is further configured to:

When the collected statistics module counts a new headway distance in the time interval of the saturated headway, according to the new headway time interval, it is located in the saturated headway time interval of the new headway time interval. The number of head-to-head distances and the average of the head-to-head distances in the sub-sections of the saturated heads at the time of the new head are updated.

The device further includes: a data storage module 32 and/or a communication processing module 33;

The data storage module 32 is configured to store a saturated flow value determined by the saturation flow determining module; the communication processing module 33 is configured to output the saturated flow value determined by the saturated flow determining module. The operating system running on the device is an embedded Linux system.

In summary, the beneficial effects of the present invention include:

In the solution provided by the embodiment of the present invention, the pulse data outputted by the detector at the entrance of the signal intersection is collected; the time interval of the head at the entrance channel is counted according to the pulse data collected by the ;; The headway time interval determines the saturation flow value, and it can be seen that the present invention realizes an automatic measurement scheme of the saturation flow value.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each process and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The device is implemented in a flow or a flow or a block diagram of a block or multiple The function specified in the box.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those skilled in the art that <RTIgt; </ RTI> <RTIgt; Therefore, the appended claims are intended to be construed as including the preferred embodiments and the modifications

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Rights request

A method for determining a saturated flow rate, the method comprising:

2. The method according to claim 1, wherein the pulse data outputted by the detector at the entrance of the signalized intersection is collected, and the front end of the entrance is counted based on the collected pulse data. Distance, including:

A, set the value of the counter to 0;

B. Collecting pulse data of a pulse length of time output by the detector;

The method according to claim 1, wherein the determining the saturation flow value according to the statistically obtained headway time interval comprises:

The head time interval in the time interval of the preset saturated head is selected from the statistical time interval of the head; the saturated head time interval is composed of a plurality of saturated head time intervals;

For each saturated head time interval sub-section, determining the number of vehicle head time intervals in the sub-section of the saturated head, and the average value of the head time interval in the sub-section of the saturated head;

According to the determination result, P saturated head positions are selected from the plurality of saturated head time sub-intervals; P is a positive integer not greater than the total number of sub-intervals of the saturated front head;

Determining an average value of the average values of the head time intervals corresponding to the sub-intervals of the P saturated heads, and determining the determined average value as the saturated headway time interval;

The method according to claim 3, wherein the selecting, according to the determination result, the P saturated heads from the plurality of saturated headway subintervals comprises:

For each of the plurality of saturated head-to-head intervals, each of the saturated head-to-head distance sub-intervals is calculated, and the time intervals of the heads corresponding to the sub-intervals of the consecutive P saturated heads from the saturated head-to-head interval are calculated. The sum of the numbers, the P sum of the heads of the saturated heads corresponding to the largest sum value is selected.

5. The method of claim 3, further comprising:

When the new time interval of the head in the interval between the saturated heads is counted, the new headway time interval is aligned. The number of the headway in the sub-section of the saturated head when the new head is located, and the average of the headway in the sub-section of the saturated head when the new head is located are updated. .

6. The method according to any one of claims 3-5, wherein the saturation front time interval is (1.0, 5.0), and the saturated front time interval is from the following 40 saturated front time intervals. Interval composition: (1.0,1.1], (1.1,1.2], (1.2,1.3], (1.3,1.4], (1.4,1.5], (1.5,1.6], (1.6,1.7], (1.7,1.8] , (1.8, 1.9], (1.9, 2.0], (2.0, 2.1], (2.1, 2.2], (2.2,2.3], (2.3,2.4], (2.4,2.5], (2.5,2.6], ( 2.6, 2.7], (2.7, 2.8], (2.8, 2.9], (2.9, 3.0],

(3.0, 3.1], (3.1, 3.2], (3.2, 3.3], (3.3, 3.4], (3.4, 3.5], (3.5, 3.6], (3.6, 3.7], (3.7, 3.8], (3.8 , 3.9], (3.9, 4.0], (4.0, 4.1], (4.1, 4.2], (4.2,4.3], (4.3,4.4], (4.4,4.5], (4.5,4.6], (4.6,4.7 ], (4.7, 4.8], (4.8, 4.9), (4.9, 5.0];

The value of P is 10.

The method according to any one of claims 1 to 5, characterized in that the frequency of collecting the pulse data is 20 milliseconds.

8. A device for determining a saturated flow rate, the device comprising:

a collection statistics module, configured to collect pulse data of a detector output at an entrance lane of a signalized intersection; the detector is configured to detect in real time whether a vehicle exists at the inlet lane, and the pulse data is used for Data indicating the detection result; counting the headway distance at the inlet lane based on the pulse data collected by the enthalpy; the vehicle head time interval indicating the time at which the vehicle exists at the inlet lane and the vehicle existing at the inlet lane The time difference between the last moments;

9. The apparatus according to claim 8, wherein the collection statistics module is configured to: perform the following steps A to C:

A, set the value of the counter to 0;

B. Collecting pulse data of a pulse length of time output by the detector;

The apparatus according to claim 8, wherein the saturation flow determining module is configured to: screen, from a statistically obtained headway time interval, a headway time interval within a preset time interval of the saturated headway; The saturated headway interval interval is composed of a plurality of saturated headway time interval subintervals;

According to the determination result, P saturated heads are selected from the plurality of saturated head time subintervals; P is a positive integer not greater than the total number of sub-intervals of the saturated head; Determining an average value of an average value of the head time intervals corresponding to the sub-intervals of the P saturated heads, and determining the average value as a saturated headway time interval;

The device according to claim 10, wherein the saturation flow determining module is configured to: calculate, from the saturated sub-interval for each of the plurality of saturated head-to-head intervals When the front of the vehicle head is at a distance from the sub-section of the continuous P, the sum of the number of the heads of the heads corresponding to the sub-intervals is selected, and the P-saturated head-to-head sub-intervals corresponding to the largest sum value are selected.

12. The apparatus according to claim 10, wherein the saturation flow determining module is further configured to: when the collected statistics module counts a new headway time interval within the time interval of the saturated front head According to the new headway distance, the number of the headway distances in the sub-section of the saturated head when the new headway is located, and the time interval of the saturated head when the new headway is located The average value of the headway is updated.

The device according to any one of claims 8 to 12, further comprising: a data storage module and/or a communication processing module;

The data storage module is configured to store a saturated flow value determined by the saturated flow determination module;

The communication processing module is configured to output a saturated flow rate value determined by the saturation flow determination module.

14. Apparatus according to any of claims 8-12, characterized in that the operating system operated by the apparatus is an embedded Linux system.