Drive recorders which are deployed in the application fields development and vehicle testing must be connected to various vehicle buses. In addition, ECU internal signals and measurements from the vehicle environment have to be recorded at high rate. The signals from the different sources have to be aquired synchonously to ensure the time correlation of the measured data.
Acquisition of data from ECUs and vehicle buses
To validate ECU functions, the ES720 module records signals from ECUs and vehicle buses. In some cases, such as evaluations of competitor vehicles, the network is the only possible access to the digital signals of the electronic controls and diagnostics in the vehicle.
Complex trigger conditions
Appropriate trigger conditions allow for the intelligent control of data recording using the ES720 module. The drive recorder offers the same trigger mechanisms as INCA. Befor depployment in the drive recorder, trigger conditions can be comfortably tested and changed with INCA.
During test runs, several vehicle functions are normally tested at the same time. The different experiments are usually monitored by various experts. The ES720 Drive Recorder supports simultaneous recording of different measurements (multi-recording). Different start and stop triggers can be assigned to each of the individual recorders. The measurements acquired in parallel are stored in own measure files each.
In addition to the control functions, the ECU on-board diagnostics has to be examined carefully. The ES720 module supports the standard diagnostic interfaces and protocols and is able to access the complete diagnostic system of the vehicle on the basis of ODX descriptions. Using diagnostic data recorded simultaneously to signals from sensors, buses and ECUs, it is possible to analyze errors in diagnostics in correlation to the behavior of the remaining system.
Fast measurement readiness and short boot times
In standby mode, the ES720 module is ready to measure within about 10 seconds. Switching between standby and measurement mode is done either manually using the button on the unit, on a time-controlled or remote-controlled basis by TTL signal - for example using "terminal 15", - or by switching a connected PC or Ethernet module on or off.
In combination with the ES593-D ECU and Bus Interface Module, data on the CAN bus can be logged immediately after start of communication. In addition to one ETK and two XETK/Ethernet interfaces, the ES593-D module provides four CAN ports. Once the unit receives messages on a CAN port, it automatically turns on and also switches on the drive recorder and all other ETAS modules in the measuring system. The ES593-D module buffers the received CAN messages until the drive recorder starts recording data. The wake-up and buffering functions are supported by two of the four ES593-D CAN interfaces and provide for the logging of CAN messages within 1 second after start of CAN communication.
Recording signals from rapid prototyping models
New controls are tested as prototypes in real-life operation. To validate the correct behavior of new ECU functions, the ETAS ES910 prototyping system can be connected to the ES720 module alongside the other signal sources, if the ES720 Experimental Target Integration Package add-on is installed.