Simulink® Modeling for Vehicle Simulator Design - Delphi

Figure 12. DAQ Concept
In Simulink ® , the above concept has been implemented as
follows:
Figure 12a. Simulink ® Implementation of CCP and
DAQ
The Simulink ® model configures the ECU to send periodic
updates of memory (DAQ) through following CCP
commands.
1. SET_DAQ_PTR
2. WRITE_DAQ
3. START_STOP
Figure 12b. Timestamp Check
Figure 12c. Encoding values to DAQ buffer
Figure 12d. Decoding values front DAQ buffer
At this point ECU starts sending DAQ messages on CAN
bus. The simulator receives these messages.
The DAQ buffer update process is executed much faster
(4ms) than the minimum DAQ period (20ms) and hence
needs to check for the new timestamp to avoid duplication of
data in DAQ buffer.
This is achieved by comparing the current timestamp with the
last stored timestamp.