中心線偏移試驗(yàn)

1、Introduction/簡介The deviation of a vehicle from a specified centre line can be measured with a VBOX to an accuracy of between 1 and 2cm (over a 30 second time period).我們可以通過VBox可以測量出汽車與某規(guī)定的中心線的偏移量，VBox的測量精度可以達(dá)到12cm (在30秒內(nèi))Applications/應(yīng)用范圍Measuring side wind susceptibility測量側(cè)向風(fēng)影響Measuring vehicle dev

2、iation (with no steering input)測量車輛的跑偏量(沒有轉(zhuǎn)向輸入)Measuring vehicle deviation during brake stops測量車輛制動時(shí)的跑偏量Measuring vehicle deviation during lane change tests (Electronic stability control, FMVSS126)測量車輛變道測試中的跑偏量(電子穩(wěn)定性控制，F(xiàn)MVSS126)Theory/原 理The VBOX measures Velocity and Heading to a high accuracy, the

3、se measured data channels are then used to determine a lateral deviation from a specified track heading at every sample using simple geometric theories. This calculated deviation (lateral displacement) is an accumulative distance measurement, so the accuracy is at its most accurate when measured ove

4、r short periods of time. This accuracy will be between 1 and 2cm over a 30 second time period, (given optimum test track and satellite conditions).VBox可以精確測量速度和航向角，這些測量的數(shù)據(jù)通道在每次采樣中通過簡單的幾何原理計(jì)算就可 用于確定相對于指定的軌道航向角的橫向偏移量。計(jì)算出的偏移量(橫向位移)是一個(gè)累計(jì)距離測 量，因此在一段較短的時(shí)間內(nèi)，其測量最為精確。在30秒內(nèi)測量結(jié)果偏差約為12cm (在較合適的 測試軌跡道及衛(wèi)星信號條件下)Su

5、itable Equipment/儀器選擇VBOXIII VBOX20SL3VBOX2SX 20Hz and 10Hz VBOXMiniVBOX20SLNOTE: The VBOXIII 100Hz is recommended for measurement of centre line deviation in high dynamic manoeuvres such as Lane Change tests.注：VBoxIII100 Hz比較適合在高動態(tài)操控的狀態(tài)下測量中心線偏移量，例如變道測 試。Test Setup /實(shí)驗(yàn)設(shè)置Place the magnetic GPS Aerial

6、 on the roof of the test vehicle and run the cable into the vehicle through the door seal. Connect the aerial cable to the VBOX ensuring the connection is free from dirt. Connect power to the VBOX using the cigar lighter adaptor or a battery pack.將帶磁性的GPS天線置于測試車輛的頂部，將電纜穿過車門的密封條。將天線的電纜與VBox連接 好，請確認(rèn)連接

7、處沒有臟物。通過點(diǎn)煙器適配器或電池組給VBOX供電。Insert an empty compact flash or SD card into the memory card slot of the VBOX. The hand held brake trigger should be connected to the digital input of the VBOX (DIG IN).將一張空的CF卡或SD卡插入VBox上的記憶卡插槽。將手動制動觸發(fā)器接到VBox的數(shù)字輸入端(DIG IN)For the test, the VBOX should be left until it ind

8、icates that at least 6 satellites are in lock. For optimum conditions the test track for this test should be open and not near to trees or buildings. The placement of the antenna on the vehicle should be on a good ground plane (a typical metal roof will suffice).對于這個(gè)試驗(yàn)，至少要等VBox鎖定了 6顆以上的衛(wèi)星后才能進(jìn)行。為了獲得較

9、好的測試條件，測試 路線應(yīng)當(dāng)在開闊地方，不要靠近樹木及樓房。在車上放置天線的地方必須在良好的平面上(一般的金 屬頂棚即可)Surveying the Heading of the test track/ 測量測試軌跡的航向角This can be done in two ways, in post processing or live using VBOXTools software. 您可以通過2種途徑來測量測試軌跡的航向角，使用VBoxTools軟件 后處理或?qū)崟r(shí)處理模式來測量測試軌跡的航向角。Surveying Heading Live using VBOXTools:/使用 VBoxT

10、ools 實(shí)時(shí) 模式測量航向角Connect a hand held Brake trigger to the dig i/p socket of the VBOX, then connect a computer to the VBOX and open the latest VBOXTools software. Select Live/VB OX mode, then open the 1Tools, drop down menu and select Centre line deviation, to open the centre line deviation setup scree

11、n. Press the brake trigger to start and stop the sampling and averaging of the heading of the centre line of the test track. During this measurement, drive carefully in a perfect straight line down your test track. Then press APPLY to set the new track heading value into the software.將手動制動觸發(fā)器連接至VBox

12、的數(shù)字輸入端，然后將VBox連接至電腦，打開最新版的VBoxTools 軟件。選擇“l(fā)ive/Vbox”實(shí)時(shí)模式，然后打開Tools下拉菜單，然后選擇Centre line deviation 中心線偏移，進(jìn)入中心線偏移設(shè)置頁面。通過按下制動觸發(fā)器來控制開始或結(jié)束采樣。對測試軌道 中心線的航向角取均值。在測量過程中，請按照您的測試路線的直線部分小心駕駛。然后按下“APPLY ”按鈕，將新的軌跡航向角數(shù)值輸入軟件。Surveying the Heading in post processing using VBOXTools:/使用 VBoxTools 后處理模式測量 航向角Insert a C

13、F or SD card into the VBOX, then drive carefully in a perfect straight line down your test track, repeat the drive 2-3 times.將CF卡或SD卡插入VBox，然后請按照您的測試路線的直線部分小心駕駛，重復(fù)2到3次。Then load the file from the data card into VBOXTools and open the Graph Screen to display the logged file.將數(shù)據(jù)卡上的文件導(dǎo)入VBoxTools，打開圖表頁面

14、，顯示已記錄的文件。Then use the Graph screen Measure Tool to highlight and average the part of the logged file where the vehicle is driving in a straight line down the centre of the track. To do this, ensure that Heading is visible in the graph screen then click and release the mouse on the start of the data

15、 where the heading is stable so that the cursor appears at that point. Now hold the shift key down, click on the cursor and drag it to the end of the straight, making sure you are still selecting a stable region for the heading.然后使用圖表頁面的測量工具，用高亮工具標(biāo)注記錄文件中車輛沿著軌道中心直線行駛的部分， 并對其取均值。要這樣做，請確保航向角在圖表頁面中可視，然后

16、在數(shù)據(jù)的開始位置可以見到航向角 的地方點(diǎn)擊并且放開鼠標(biāo)，這樣光標(biāo)會在這點(diǎn)出現(xiàn)?，F(xiàn)在按住shift鍵向下，單擊光標(biāo)，將其拖曳至直 線的結(jié)束位置，請確保您選定的位置仍然是航向角穩(wěn)定的區(qū)域。A blue box should appear whilst you are dragging the cursor with the shift key held down: 當(dāng)您按住shift鍵拖曳指針時(shí)，會出現(xiàn)一個(gè)藍(lán)色的方框：!A box will pop up showing a number of parameters. If you look down the Average column, and

17、 then take the heading value, you will get an average heading for this section of track (181.910 degrees in the example above).之后還會彈出一個(gè)顯示一系列參數(shù)的對話框。如果您查找平均值列，然后查看航向角值，您就可以獲 得這段軌跡航向角的平均值。(在上述例子中為181.910度)It is best to repeat this test, and check that the average heading is within a few tenths of a deg

18、ree. If it is not, take an average of a number of runs.我們建議您最好能再重復(fù)此測試，檢查取得平均航向角偏差是否在零點(diǎn)幾度。如果不是您可以取幾次 結(jié)果的平均。When you have established the heading of the centre line of the test track, enter the heading value manually into the Centre line deviation set-up window and press apply.當(dāng)您確定了測試線路中心線的航向角，將航向角的值人

19、工輸入到中心線偏差設(shè)置窗口中并點(diǎn)擊應(yīng) 用。Test Procedure/測試過程Results from the centre line deviation can be produced in two ways.中心線偏移測試結(jié)果的測試可以有2種方法產(chǎn)生。Live: Results are calculated and displayed live in VBOXTools software.實(shí)時(shí)模式：計(jì)算結(jié)果實(shí)時(shí)顯示在VBoxTools軟件中。Post processing: During the test data is recorded onto a data card and the

20、n results are calculated from the logged data at a later time using VBOXTools software.后處理模式：將測試數(shù)據(jù)記錄到數(shù)據(jù)卡中，然后使用VBoxTools軟件計(jì)算記錄的數(shù)據(jù)以獲得結(jié)果。Live:/實(shí)時(shí)模式Connect a PC running the latest VBOXTools software to the VBOX. Establish the heading of the centre line of the test track, as shown above.將電腦連接到VBox上，運(yùn)行最新版

21、本的VBoxToolso創(chuàng)立測試軌跡中心線的航向角，如上述所示。Once the heading of the centre line of the test track has been set-up in the software then open the Report Generator screen and configure the Test setup by configuring the start and stop conditions to suit the Vehicle test在軟件中設(shè)置了測試軌跡中心線航向角后，打開報(bào)告生成器頁面，設(shè)置適當(dāng)?shù)能囕v測試開始及結(jié)束條 件

22、。/t RACELOGIC_中心線偏移Centre line deviation is available as a column title in the Report Generator screen, so now insert Centre line deviation as a Column title.在報(bào)告生成器頁面中的列標(biāo)題選項(xiàng)中有中心線偏差這列，因此您可以將其插入列標(biāo)題。Once centre line deviation is set as a column title in Report Generator it will display the deviation at

23、 the end of the test that has been setup.一旦在報(bào)告生成器中插入了中心線偏差列，報(bào)告生成器就會在設(shè)定測試結(jié)束后顯示偏差值。Now press F2 to start the Report Generator and perform the Vehicle centre line test, results will automatically be calculated and displayed in the table.按F2啟動報(bào)告生成器執(zhí)行車輛中心線測試，結(jié)果會自動計(jì)算并顯示在表格中。Report Generator - centre-line

24、(modified)useRun numTime(s)Dist(rn)Centre Line D&viatianGraph runDescription100.000.00Trigger Start11.Q0L2.33-0,23Time Line12.0021.13-1.36Tinrie Line12.6523.0-1.725 peed EndShowing Centre Line Deviation in a Live Window:在實(shí)時(shí)窗口中顯示中心線偏移：During the testing the centre line deviation can be viewed more cl

25、early in a live window. There are two ways of showing a live window of centre line deviation.在測試中心線偏移的過程中，您可以在實(shí)時(shí)窗口中更清楚的查看結(jié)果。您可以通過以下2種方法 顯示中心線偏差實(shí)時(shí)窗口。From Rep Gen:通過報(bào)告生成器：o Right click on the centre line deviation column title and select Show as Live Window. NOTE, this only updates results at the same

26、 time as they are updated in the Rep Gen results table.o 右鍵單擊中心線偏差列標(biāo)題然后選擇顯示實(shí)時(shí)窗口。注意，這僅僅是在報(bào) 告生成器的結(jié)果表格的數(shù)據(jù)更新的同時(shí)更新結(jié)果而已。From Main Toolbar通過主工具欄o Click New Window from the main tool bar, then right-click on the new window and select Centre Line Deviation from the Data - Calculated menu option. NOTE, this l

27、ive window is constantly updated and is only reset by pressing a connected brake trigger.o 在主工具欄中單擊新窗口，右鍵單擊新窗口然后從數(shù)據(jù)一 計(jì)算菜單選項(xiàng)中 選擇中心線偏差。注意，這個(gè)實(shí)時(shí)窗口將不斷地更新，只有按下連接的制動觸 發(fā)器才能重置此窗口。Post Processing:/后 處理模式Insert a data card into the VBOX and then perform the vehicle centre line test. Load the logged file into t

28、he VBOXTools software. Ensure the heading of the straight line of the test track is set in the centre line deviation setup screen, as shown above. Open the Report Generator screen and configure the test setup to suit the vehicle test, inserting centre line deviation as a column title, as shown above

29、.將數(shù)據(jù)卡插入VBox然后執(zhí)行車輛中心線測試。將記錄文件導(dǎo)入VBoxTools軟件。請確保測試軌跡直 線段部分的航向角已經(jīng)在中心線偏移設(shè)置頁面中設(shè)置完成，如上述所示。Then press F2 (scan) to display results from the file in the Rep Gen results table.按F2 (掃描)在報(bào)告生成器的結(jié)果表格中顯示文件中的結(jié)果。Report Generator - centre-line (modified)US盡Run numIirme(5)Oi5t(rn)Centre Line DeviationGrph runDescription100.000.00Trigger Start11.Q0L2.33-0,23Time Line12.0021.13-1