大众车行车电脑说明书(18)

大众车行车电脑说明书

Measuring Blocks cont. - Section 6-CLabel Files also allow a third label field to be defined for each of the normal measuring block fields. This label is displayed in a balloon when the user clicks on the field. The idea is to put "specified values" in this field:Sample Rate: Some ECUs may not be willing to produce more than about 3.5 samples per second when running a single group, even with the most aggressive protocoltiming settings. Other ECUs may be much faster. Except on the slowest most ancient PCs, this is a limitation inherent in the firmware in the ECU, not a limitation in the VCDS software or the PC. Naturally, if two groups are being displayed simultaneously, the sample rate drops about half what it was running a single group, and 3 groups simultaneously runs at around 1/3. Sample Rate will vary from controller to controller. Some controllers (particularly AG4 transmissions and Digifant-III ECU's) use a "hybrid" data-type that requires reading a long header when changing group numbers. Viewing multiple groups still works with these data types, but the sample rate becomes extremely slow. If you see "Reading Header" all the time under the Sample Rate display, you'll know you've got one of these. In Engine controllers using KWP-2000 or CAN, there is a [Turbo] button in the top right of the Measuring Blocks screen. Pressing this button can significantly speed up sampling, for example over 30 samples per second when logging a single group in our Touareg. Once you have pressed [Turbo] you will remain in this High-Speed mode until you exit the Measuring Blocks screen:The [Graph] button is used to open up VC-Scope, a plug-in for VCDS that allows you to graph Measuring Group Information. See Section 34 for information on VC-Scope. Use [Done, Go Back] to return to the Open Controller screen.