Data. Declaration System DDS. DDS Advanced Training. Raster & DAQ-Lists Configuration. DDS Advanced Training

Transcription

1 Data DDS Declaration System Page: 1

2 Content What is a raster? Raster & OnlineUpdate in SysConf Configuration of raster Configuration of DAQ-List Configuration of onlineupdate Objectives: After completing this unit you will: know how rasters, DAQ-Lists and onlineupdate work together know how to configure raster definitions know how to activate DAQ-Lists for CCP know how to handle onlineupdate definitions Page: 2

3 What is a Raster? The raster entity is required for performing data acquisition. Raster correspond to sample events provided by the ECU (periodic in time or in event, i.e. 10ms or 1st cylinder). Online update rates, which reference raster, correspond to data acquisition channels. The raster entity has three use cases: 1. It is used to generate the ASAP2 object 'RASTER' which is especially needed within IF_DATA statements 2. It is used to generate the ASAP2 object 'SOURCE', which is needed within IF_DATA ASAP1B_CCP block. This is basically the DAQ List definition. 3. It is used from the onlineupdate entity which is needed for online data. Based on this onlineupdate entity, individual RASTER objects can be generated during the ASAP2 export (similar behaviour in SAM) Page: 3

4 Raster & OnlineUpdate in SysConf Raster definition for Online Values OnlineUpdate entities reference one or several raster entities. They are mainly used to configure the data acquisition Page: 4

5 Raster Unique Id, which is used to identify the Raster to the ECU. DDS assumes that a DAQ list can have only one fixed specific Raster This is the unit in which the field "Rate" is given. The coding of the Scaling Unit is the same as the one defined in the ASAP2 specification Raster Name RASTER attributes Sampling rate at which the variables in this DAQ list are sampled. If given, this ID is used instead of the DTO CAN ID to transmit the DAQ data of this DAQ list Specifies whether the 'Transmission rate prescaler' parameter of the CCP command 'Start/Stop Data transmission' is supported by the ECU. This field specifies the PID number of the first ODT in this DAQ list. (for details, see SysConf online help) If checked, the CAN ID is variable and can be specified by the user in the MCD tool. DAQ list attributes This text is used to identify the DAQ list in the tools user interface, e.g. in table headings The length of the DAQ list in the ECU. The value is in terms of ODTs. Page: 5

6 DAQ-List Rule: One raster corresponds to one DAQ-List For CCP, DAQ-Lists can be configured with SysConf in the CCP section Due to the fact that the DAQ-List is identical to the raster, the configuration is very simple and restricted to the selection of wanted rasters only. Configure DAQ-Lists only by selecting the wanted raster definitions Page: 6

7 OnlineUpdate Name of OnlineUpdate List of referenced raster definitions It is useful to adapt the onlineupdate rates to the ECU s real capability of data acquisition. ECU software implementation may restrict the available rasters For an engine control project, the first step is typically to customise the online update configuration for the number of cylinder used in the engine. Not used onlineupdate entities can be deleted. Page: 7

8 Summary Page: 8