CN108844744B

CN108844744B - Intelligent guiding and monitoring platform and method for automobile test driving

Info

Publication number: CN108844744B
Application number: CN201810274194.2A
Authority: CN
Inventors: 闵杰; 迟鹤津; 刘建峰; 李捷; 贾旭岩; 李军
Original assignee: China Automotive Technology and Research Center Co Ltd
Current assignee: China Automotive Technology and Research Center Co Ltd
Priority date: 2018-03-29
Filing date: 2018-03-29
Publication date: 2021-03-19
Anticipated expiration: 2038-03-29
Also published as: CN108844744A

Abstract

The invention provides an intelligent guiding and monitoring platform and method for automobile test driving, which comprises a vehicle-mounted power supply, an NI compact RIO, a vehicle-mounted 4G router, a vehicle-mounted computer and a touch screen, wherein the NI compact RIO is connected with the vehicle-mounted 4G router; the vehicle-mounted power supply is used for supplying power to the whole monitoring platform; the NI compactRIO is internally provided with a data acquisition card and is used for acquiring parameter information in the vehicle running process and establishing a standard OBD data model, and the NI compactRIO calculates and stores data according to the requirements of a configuration file and sends the data to the vehicle-mounted 4G router in real time through a local area network; the vehicle-mounted 4G router sends data to a vehicle-mounted computer; and the vehicle-mounted computer uploads the received content to the server side, and gives driving guide information according to the acquired signal. The invention improves the precision of the whole vehicle road test; the invention improves the working efficiency of engineers in the finished automobile road test and reduces the labor intensity.

Description

Intelligent guiding and monitoring platform and method for automobile test driving

Technical Field

The invention belongs to the technical field of finished automobile testing, and particularly relates to an intelligent guiding and monitoring platform and method for automobile testing driving.

Background

When a precise road test is carried out, a driver does not have a guide interface, and common voice prompt cannot guarantee that the test driver can precisely complete driving operation, such as curve following operation. It is generally necessary for the driver and the copilot to operate simultaneously to guide the vehicle to follow the curve.

The prior art has the following disadvantages:

1. the traditional navigation guidance system lacks openness, and the GPS-based driving guidance system has low reaction speed, so that the accuracy is poor, and the system cannot adapt to high-accuracy testing.

2. When testing the high-precision road, the testing personnel must follow the vehicle, so the labor intensity is relatively large, and the human resources occupy more.

Disclosure of Invention

In view of this, the invention aims to provide an intelligent guiding and monitoring platform for automobile test driving, which solves the problems in the prior art.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

an intelligent guiding and monitoring platform for automobile test driving comprises a vehicle-mounted power supply, an NI compact RIO, a vehicle-mounted 4G router, a vehicle-mounted computer and a touch screen;

the vehicle-mounted power supply is used for supplying power to the whole monitoring platform;

the NI compactRIO is internally provided with a data acquisition card and is used for acquiring parameter information in the vehicle running process and establishing a standard OBD data model, and the NI compactRIO calculates and stores data according to the requirements of a configuration file and sends the data to the vehicle-mounted 4G router in real time through a local area network;

the vehicle-mounted 4G router sends data to a vehicle-mounted computer;

the NI compact RIO is also connected with the OBD of the whole vehicle through a CAN communication interface;

the vehicle-mounted computer is connected with the touch screen;

and the vehicle-mounted computer uploads the received content to a server side and gives driving guide information according to the acquired signal.

Further, the data collected by the data collection card includes, but is not limited to, analog signals: cooling water temperature, ambient temperature, engine oil temperature, fuel pressure, intake pressure; digital signal: serial data of the oil consumption meter and pulse data of the tachometer.

Further, the vehicle-mounted computer comprises a tablet computer or an industrial personal computer.

Furthermore, the vehicle-mounted computer is connected with the touch screen through an HDMI cable and a USB cable.

Further, the standard OBD data model is based on data models of SAE J1939 and SAE J1979, and is a data model formed by hundreds of OBD data bits defined by the above two standards, the NI CompactRIO converts the data model into a configuration file of a list formula, selects several items in the list as acquired data items in the configuration file, and performs data translation according to the definition of the list.

Further, after receiving the CAN information through the serial port, the NI CompactRIO performs verification calculation on the data to remove invalid data that may occur, and the specific invalid data verification method includes the following steps:

1. vehicle speed data:

f) vehicle speed acceleration > vehicle maximum acceleration;

g) the vehicle speed data is less than 0 or greater than the designed maximum vehicle speed of the vehicle;

the data bit is deleted and replaced by the previous valid data when the above condition occurs;

2. mileage data:

h) a case where the mileage data is reduced;

i) the accumulated amount of the vehicle speed data changes but the mileage data does not change;

when the situation occurs, gps data is used for replacing and alarming;

3. other data:

j) exceeding the upper and lower limits of the data definition domain value;

the above occurs and the data is ignored and replaced with the previous valid data.

Further, the NI CompactRIO combines and adds the NI CompactRIO and the NI CompactRIO according to the code 0121, that is, the failure history is not found, and 0131, that is, the distance from the last failure mileage, adds the initial test mileage as the current mileage, and clears and accumulates the failure code again when the sum of the NI CompactRIO and the initial test mileage exceeds HEX FFFF, the formula is: if Mil (0121) + Mil (0131) <60000, odometer (now) ═ odometer (start) + Mil (0121) + Mil (0131); if Mil (0121) + Mil (0131) >60000, a clear fault code operation is performed, at which time Mil (0121) + Mil (0131) is cleared and Odometer (now) is assigned to Odometer (start); the problem of recording the mileage of the light vehicle is solved by the method.

Further, the NI CompactRIO is performed by checking the mileage of the OBD with the straight-line GPS positioning data, and the accumulated GPS positioning mileage within 300 seconds is considered, if the following conditions are satisfied:

1. the accumulated mileage of the GPS is more than 5 km;

2. GPS positioning defines starting coordinates (X1, Y1), ending coordinates (X300, Y300), k ═ Y300-Y1)/(X300-X1); yi '═ Xi [ Y300-Yi (Y300-Y1)/(X300-X1) ], di [ (Yi-Yi') 2/(1+ k2) ] (1/2), all di <50 meters,

the road section is considered as a straight road section, and the accumulated mileage of the road section gps is used for checking the OBD mileage;

defining the gps accumulated mileage as Mgps, the corresponding OBD mileage as Mobd, defining K as (Mgps-Mobd)/Mgps, and K as a correction coefficient, wherein after 3 times of correction, the error of the correction coefficient is less than 1%, and the correction coefficient is not changed; if the OBD mileage corresponding to the start of the test is Odo0, the corrected mileage at the current time is Odoi' Odo0+ K (Odoi-Odo 0);

during programming, 3 data, mileage before correction, mileage after correction and correction coefficient are required to be recorded, an initial correction coefficient is defined as 1, and before test work, OBD odometer correction is performed for 3 times, which can be performed continuously, so that the stability and reliability of the correction coefficient are ensured.

Furthermore, the server side compares and judges the received data with a preset configuration file, and alarms when the data exceeds a limit, so that an engineer can supervise the data.

Compared with the prior art, the intelligent guiding and monitoring platform for automobile test driving has the following advantages:

(1) the invention improves the precision of the whole vehicle road test;

(2) the invention improves the working efficiency of engineers in the finished automobile road test and reduces the labor intensity;

(3) the invention can be widely applied to the projects of emission test, road driving test, vehicle fuel consumption test, component vehicle reliability test and the like, and can also be used for collecting road spectrums, carrying out big data analysis, optimizing road traffic, optimizing vehicle design and the like.

Another objective of the present invention is to provide an intelligent guiding and monitoring method for testing driving of an automobile, so as to solve the above mentioned problems.

an intelligent guiding and monitoring method for automobile test driving specifically comprises the following steps:

(1) the NI compactRIO is used for acquiring parameter information in the driving process of the vehicle, a standard OBD data model is established, and the NI compactRIO calculates and stores data according to the requirements of configuration files and sends the data to the vehicle-mounted 4G router in real time through a local area network;

(2) the vehicle-mounted 4G router sends data to a vehicle-mounted computer, the vehicle-mounted computer uploads the received content to a server side, the server side makes an upper computer interface through Labview, compares and judges the data received by the server side with a preset configuration file through compiling a test case, and gives an alarm when the data exceeds a limit, so that an engineer can supervise the data and give driving guide information according to acquired signals.

The intelligent guiding and monitoring method for the automobile test driving has the same beneficial effects as the intelligent guiding and monitoring platform for the automobile test driving, and the detailed description is omitted.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of an intelligent guiding and monitoring platform for testing driving of an automobile according to an embodiment of the present invention;

fig. 2 is a schematic interface diagram according to an embodiment of the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in FIG. 1, the invention develops the vehicle-mounted equipment, and can realize data acquisition (including various digital and analog signals, especially a standard OBD data model based on SAE J1939 and SAE J1979) and a driver guide function based on OBD data;

the modules are combined according to requirements, so that the system can be widely applied to projects such as emission tests, road driving tests, vehicle oil consumption tests, component vehicle reliability tests and the like, and can also be used for collecting road spectrums, analyzing big data, optimizing road traffic, optimizing vehicle design and the like.

The server side is provided with a data analysis system, and the data of the whole vehicle can be checked, downloaded and analyzed according to different permission levels. The configuration file is remotely pushed by the server side, so that data acquisition with different frequencies and different configurations can be realized. The test bed is equivalent to a laboratory environment constructed on the whole vehicle.

The data model based on SAE J1939 and SAE J1979 is a data model formed by hundreds of OBD data bits defined by the above two standards, the data model is converted into a list configuration file, in actual use, a plurality of items in the list are selected from the configuration file to be used as acquired data items, and data translation is carried out according to the definition of the list. In practical operation, the following two specific problems are mainly solved:

a: the invention relates to a light vehicle recording mileage problem, a light vehicle OBD has no mileage information according to an SAE J1979 model, the invention combines and adds codes 0121 (no fault history) and 0131 (distance from last fault mileage), adds a test initial mileage as a current mileage number, and clears and accumulates a fault code again when the sum of the two exceeds HEX FFFF. The formula is as follows: RuoMil (0121)

+Mil(0131)<60000，Odometer(Now)＝Odometer(start)

+ Mil (0121) + Mil (0131); if Mil (0121) + Mil (0131) >60000, a clear fault code operation is performed, at which time Mil (0121) + Mil (0131) is cleared and Odometer (now) is assigned to Odometer (start); the problem of recording the mileage of the light vehicle is solved by the method.

B: and (5) checking mileage of the heavy-duty vehicle. For heavy vehicles, according to the national standard 'speedometer for automobiles' (GB15082-2008), the relation between the speedometer required by China and the actual speed is that the indicated speed is more than or equal to 0, and the actual speed is less than or equal to the actual speed/10 +4 km/h; in addition, a large error in vehicle speed is often caused due to the size of the replaced tire, and the like. Generally, the meter panel of the heavy vehicle displays the mileage meter and the mileage data and actual mileage in the OBD often have great difference, and the inaccuracy of the vehicle speed and mileage causes great confusion and error to the mileage accumulation test. In the instrument system, the data of the GPS positioning system can be simultaneously used as a reference. Therefore, the OBD odometer can be verified in a gps automatic verification mode. So there are a total of four mileage systems: 1. actual mileage is 2, instrument panel mileage is 3, OBD mileage is 4, GPS speed accumulated mileage. Of the four types of mileage, the actual mileage is relatively true according to mutual verification of some of the latter three types of mileage measurement systems with different characteristics. The advantages and disadvantages of the latter three mileage systems are mainly:

instrument panel mileage: the method cannot be digitalized and has unknown accuracy;

and (3) OBD mileage: digitalization, easy acquisition and recording, better accuracy than instrument panel mileage generally, but still has the possibility of larger error;

GPS speed accumulated mileage: the linear section is better, and in the curve section, the sampling frequency is low, so the precision is poorer;

therefore, the invention is carried out by using the mode of checking the mileage of the OBD by the straight-line segment GPS positioning data.

And (3) considering the GPS positioning accumulated mileage within 300 seconds, if the following conditions are met:

1. the accumulated mileage of the GPS is more than 5 km;

2. GPS positioning defines start coordinates (X1, Y1), end coordinates (X300, Y300), and k ═ k

(Y300-Y1)/(X300-X1)；Yi’＝Xi*[Y300-Yi*(Y300-Y1)/

(X300-X1)],di＝[(Yi-Yi’)²/(1+k²)]^(1/2)All of di<The length of the rice is 50 meters,

and considering the road section as a straight road section, and using the accumulated mileage of the road section gps to check the OBD mileage.

Defining the gps accumulated mileage as Mgps and the corresponding OBD mileage as Mobd, and defining

And K is (Mgps-Mobd)/Mgps, K is a correction coefficient, and after 3 times of correction, the error of the correction coefficient is less than 1%, and the correction coefficient is not changed. The OBD mileage corresponding to the start of the test was Odo₀If the current time is the corrected mileage Odo_i’＝Odo₀+K(Odo_i-Odo₀)。

When programming, 3 data, mileage before correction, mileage after correction and correction coefficient are required to be recorded. An initial correction factor of 1 is defined. Before the test work begins, 3 times of OBD odometer correction (which can be continuously performed) should be performed to ensure that the correction coefficient is stable and reliable.

In the aspect of hardware, the invention mainly comprises a set of vehicle-mounted equipment.

The vehicle-mounted equipment comprises a vehicle-mounted power supply, an NI compact RIO, a 4G router, an industrial control computer and a touch screen.

The invention uses NI compactRIO (cRIO for short) as a core part and uses 12V or 24V of a vehicle for power supply. And is equipped with a backup power supply and uses an 83724G router as a vehicle network terminal. In software aspect, the server side uses a Windows server. And the server side realizes a data service user interface by using LabVIEW and Java mixed programming. And the client uses LabVIEW to realize the programming of the compactRIO host and the FPGA thereof.

The invention CAN use ELM327+ MCP2551 or MCP2515+ MCP2551 combination as an interface circuit for CAN communication with the OBD of the whole vehicle, and has the difference that the CAN OBD protocol CAN be converted into a set of simpler AT instruction set for communication by using the ELM327+ MCP2551 combination, but the communication speed is lower, and the CAN OBD protocol is more suitable for long-term test with relatively lower real-time requirement; the use of MCP2515+ MCP2551 requires application layer programming using the J1939 and J1979 protocols to obtain full vehicle data, which may cause a problem in that part of the data cannot be read due to modifications to the standard protocols by the ECUs of part of the vehicles (particularly heavy vehicles).

After the CAN information is received by the NI CompactRIO through the serial port, verification calculation is carried out on the data, invalid data which may appear is eliminated, for example, the speed of a vehicle is reduced from 50 kilometers to 0 within 0.1 second, and then is increased from 0 to 50 kilometers, and the vehicle belongs to the invalid data.

The specific invalid data checking method comprises the following steps:

1. vehicle speed data:

a) acceleration of vehicle speed>Vehicle maximum acceleration (normally set to 10m/s for a typical vehicle)²)

b) The vehicle speed data is less than 0 or greater than the vehicle design maximum speed (typically 255).

This data bit erasure occurs as described above. The previous valid data substitution is used.

2. Mileage data:

c) the situation of mileage data decrease

d) The accumulated amount of the vehicle speed data changes but the mileage data does not change.

The above occurs, the gps data is used instead and an alarm is given.

3. Other data

e) Exceed the upper and lower limits of the data definition domain value

The cRIO was programmed using LabVIEW.

In the NI CompactRIO, various kinds of data including, but not limited to, analog signals (e.g., cooling water temperature, ambient temperature, engine oil temperature, fuel pressure, intake air pressure, etc.), digital signals (e.g., serial data of a fuel consumption meter, pulse data of a tachometer, etc.) may be collected through a data acquisition card installed in the NI CompactRIO at the same time. The NI CompactRIO computes and stores the data as required by the configuration file.

The data is sent in real time over the local area network using NI CompactRIO into the onboard 4G router (wired or wireless connections may be used, but RJ45 network connections are typically used for stability considerations). The onboard router sends the data to the onboard computer. The computer can use a tablet personal computer or an industrial personal computer, but the heat dissipation problem needs to be considered. An industrial personal computer, which typically uses an x86_64 architecture, runs the Windows operating system and connects to the touch screen using HDMI and USB cables. The industrial personal computer is responsible for uploading the set program content to the server side; in addition, the industrial personal computer is responsible for giving driving guidance (for example, acceleration or deceleration is needed), alarming and other information according to a set program and acquired signals (for example, vehicle speed).

The invention mainly solves the problems that the driving safety is influenced by the driving in a test field environment due to the fact that the amount of the single visual information is too large, and the testing operation cannot be precisely finished due to the fact that the amount of the single visual information is insufficient due to the fact that the single visual information is only used; the solving method is as follows:

using voice prompt to prompt the driver to complete a trained 'driving segment'; when the next driving section is about to start, prompting the driver to prepare to start the next driving section by using voice; in the process of completing the driving segment, a driver can confirm the current position and time in the driving segment by intermittently and extremely briefly visualizing the screen; when the driving behavior of the driver exceeds the upper limit of the driving speed limit value set by the current working condition, a high-frequency alarm sound is sent out, and the frequency is increased along with the increase of the excess; when the driving behavior of the driver is lower than the speed lower limit set by the current driving working condition, a low-frequency warning sound is sent out, the frequency is increased along with the increase of the excess amount, and the frequency and the excess amount are not overlapped. The upper and lower limits of the current working condition are provided by test managers when editing the test cycle. The driver can carry out precise operation through phonetic, visual and alarm information after training, and the precise road test is completed on the premise of ensuring safety.

And the vehicle-mounted computer performs wireless network transmission on the data through the vehicle-mounted 4G router.

The invention uses DDNS and DSTP technologies to remotely transmit the state information of a plurality of vehicles to a server computer.

The server computer uses DDNS to obtain a public network domain name, and DSTP technology is adopted between the server computer and the client to package data. During public network transmission, port forwarding technology is used to avoid port collision.

The realized functions comprise: a series of test cycles are defined, each cycle being a time-based cycle of vehicle speed. A cyclic test sequence is defined, for example start-cycle 1-cycle 2-rest-cycle 3-end. During the test cycle, the test must be paused or resumed due to non-resistible factors, and the pause button can be pressed by the touch screen.

Because the data that the driver can read when driving is limited, through using the configuration file, can show three numbers in the lower right corner of screen for the driver to refer to. In addition, when a problem arises that it is necessary to jump to a certain moment of a certain cycle, it is possible to operate by using skip step and skip buttons, see fig. 2.

The interface problem of software design. When the LabView is used for interface design, the control does not have the function of displaying a plurality of different curves in two ways (one of the curves must be always existed to enable a driver to understand subsequent plans, the other curve represents the actual proceeding situation, before the occurrence of the situation, the curve is blank, and after the occurrence of the situation, the curve is an actual value). In order to meet the requirements, a curve display control system formed by combining 3 transparent controls is designed, as shown in fig. 2. The left side is a main display area which displays a current operating curve and a set curve and is formed by overlapping and combining two curve controls, wherein the lower layer is a control 1 which displays the set curve and comprises an upper alarm limiting line and a lower alarm limiting line; the upper layer is a control 2 for displaying an actual operation curve, and is updated in a page turning (the whole is replaced by the next section after one section is finished); the right side is provided with a secondary display area control 3, the secondary display area control is present for meeting the requirement of the driver on understanding the subsequent working conditions, the error caused by the delayed reaction after page turning is avoided, and the coexistence of the integrity and the continuity of the information is realized.

The method is realized by using a page turning mode because the test curve is very long and the contents to be displayed cannot be completely displayed in one screen. In order to realize that 3 controls page simultaneously, a program is designed:

the

controls

1 and 2 display 300 data points per page, and the control 3 displays 100 data points per page; control 2 is an active control, using the Chart control, controls 1 and 3 are passive controls, using the Graph control. Monitoring the existing data volume in the active control, when the data volume reaches 300 data points, turning pages for 3 controls, wherein the

controls

1 and 3 turn pages and read test cycle data, and the test cycle index number is increased by 300, for example, for the control 1, the index number of the first page is 0, the second page is 300, the third page is 600, and so on; for control 3, the index number is 300 on the first page, 600 on the second page, 900 on the third page, and so on. Therefore, linkage of the three controls can be realized.

For each test vehicle, a configuration file is arranged in the test equipment, and the configuration file comprises vehicle information so that the server side can identify data of different vehicles.

The vehicle monitoring can compare data returned by the vehicle through a preset configuration file, and compares and judges the data with a preset value, and an engineer gives an alarm when the data exceeds the limit, so that the engineer can supervise the data.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides an automobile test drives intelligence guide monitor platform which characterized in that: the system comprises a vehicle-mounted power supply, an NI compact RIO, a vehicle-mounted 4G router, a vehicle-mounted computer and a touch screen;

the NI compactRIO is internally provided with a data acquisition card and is used for acquiring parameter information in the vehicle driving process and establishing a standard OBD data model, and the NI compactRIO calculates and stores data according to the requirements of a configuration file, and calculates and stores the dataTong (Chinese character of 'tong')The data is transmitted to a vehicle-mounted 4G router in real time through a local area network;

the vehicle-mounted 4G router sends data to a vehicle-mounted computer;

the vehicle-mounted computer is connected with the touch screen;

the vehicle-mounted computer uploads the received content to a server side, and gives driving guide information according to the acquired signal; the data collected by the data acquisition card includes but is not limited to analog signals: cooling water temperature, ambient temperature, engine oil temperature, fuel pressure, intake pressure; digital signal: serial port data of the oil consumption meter and pulse data of the tachometer;

the NI compactRIO combines and adds the NI compactRIO and the NI compactRIO according to the code 0121, namely the failure history is not generated, and 0131, namely the distance between the NI compactRIO and the last failure mileage, adds the initial testing mileage as the current mileage, clears the failure code and accumulates the failure code again when the sum of the NI compactRIO and the current mileage exceeds the HEX FFFF, and the formula is as follows: if Mil (0121) + Mil (0131) <60000, odometer (now) = odometer (start) + Mil (0121) + Mil (0131); if Mil (0121) + Mil (0131) >60000, a clear fault code operation is performed, at which time Mil (0121) + Mil (0131) is cleared and Odometer (now) is assigned to Odometer (start); wherein, Mil (0121) represents the mileage which is not failed, Mil (0131) represents the mileage which is from the last failure, odometer (start) is the initial mileage, odometer (now) is the current mileage, and the light vehicle mileage recording problem is solved by the method;

the standard OBD data model is based on data models of SAE J1939 and SAE J1979 and is a data model formed by hundreds of OBD data bits defined by the two standards, the NI compactRIO converts the data model into a configuration file of a list, a plurality of items in the list are selected from the configuration file as acquired data items, and data translation is carried out according to the definition of the list;

the NI compactRIO is carried out in a mode of checking the mileage of the OBD by using the GPS positioning data in a straight line segment, the accumulated mileage of the GPS positioning within 300 seconds is considered, and if the following conditions are met:

(1) the accumulated mileage of the GPS is more than 5 km;

(2) the GPS positioning defines start coordinates (X1, Y1), end coordinates (X300, Y300), the GPS position data recorded per second is (Xi, Yi), a line segment is drawn with the start and end points, and the slope of the line is k, k = (Y300-Y1)/(X300-X1); a certain point on the line segment is (Xi, Yi'), wherein Xi takes the data consistent with the actual recording point, then

Yi '= Xi [ Y300-Yi (Y300-Y1)/(X300-X1) ], di = [ (Yi-Yi') 2/(1+ k2) ] (1/2) is the distance between two points, if all di are less than 50 m, the vehicle driving road section is considered to be a straight road section, and the GPS is used for accumulating mileage to check the OBD mileage;

defining the gps accumulated mileage as Mgps, the corresponding OBD mileage as Mobd, defining K = (Mgps-Mobd)/Mgps, wherein K is a correction coefficient, and after 3 times of correction, the error of the correction coefficient is less than 1%, so that the correction coefficient is not changed; the corresponding OBD mileage at the beginning of the test is Odo0, and the corrected mileage at the current time is Odoi' = Odo0+ K (Odoi-Odo 0);

when programming is carried out, 3 data, mileage before correction, mileage after correction and correction coefficient are required to be recorded, an initial correction coefficient is defined as 1, and before test work is started, OBD odometer correction is carried out for 3 times, which can be continuously carried out, so that the correction coefficient is ensured to be stable and reliable;

and the server side compares and judges the received data with a preset configuration file, and alarms when the data exceeds a limit, so that an engineer can supervise the data.

2. The intelligent guiding and monitoring platform for automobile test driving according to claim 1, characterized in that: the vehicle-mounted computer comprises a tablet computer or an industrial personal computer.

3. The intelligent guiding and monitoring platform for automobile test driving according to claim 1, characterized in that: the vehicle-mounted computer is connected with the touch screen through the HDMI cable and the USB cable.

4. The intelligent guiding and monitoring platform for automobile test driving according to claim 1, characterized in that: after the NI compactRIO receives the CAN information through the serial port, data are checked and calculated, and invalid data which possibly appear are eliminated, wherein the specific invalid data checking method comprises the following steps:

(1) vehicle speed data:

vehicle speed acceleration > vehicle maximum acceleration;

the vehicle speed data is less than 0 or greater than the designed maximum vehicle speed of the vehicle;

(2) mileage data:

a case where the mileage data is reduced;

the accumulated amount of the vehicle speed data changes but the mileage data does not change;

when the situation occurs, gps data is used for replacing and alarming;

(3) other data:

exceeding the upper and lower limits of the data definition domain value;

5. The monitoring method of the intelligent guiding and monitoring platform for the automobile test driving according to any one of the claims 1 to 4 is characterized in that: the method specifically comprises the following steps:

(1) collecting parameter information of vehicle in running process by NI compactRIO, establishing standard OBD data model, calculating and storing data by NI compactRIO according to configuration file requirement, andtong (Chinese character of 'tong')The data is transmitted to a vehicle-mounted 4G router in real time through a local area network;