ETAS ES4440.2 - Functions and Features; Failure Simulation

ES4440.2 Compact Failure Simulation Module - User’s Guide14
Introduction ETAS
1.7 Functions and Features
This section provides a short overview of the functions and features of the
ES4440.2 Compact Failure Simulation Module. A detailed description can be
found in the chapter "Hardware Features" on page 19.
1.7.1 Failure Simulation
The ES4440.2 Compact Failure Simulation Module makes it possible to simulate
failures in real time for 80 ECU channels (per ES4440.2).
High-Current Channels
64 of these channels are for voltages up to 30 V and currents up to 20 A – the
following failures can be simulated for these 64 channels:
• Open load
• Short to +UBatt_A, -UBatt_A, +UBatt_B, -UBatt_B with or without con-
nected load
• Contacts between lines with and without resistance ("Pin-to-Pin") with or
without connected load
• Line resistance (”In-Line”)
• Pull-up resistance to +UBatt_A or +UBatt_B with or without connected
load
• Pull-down resistance to -UBatt_A or -UBatt_B with or without connected
load
High-Voltage Channels
A further 16 channels are for voltages up to 80 V RMS and currents up to 10 A
– the following failures can be simulated for these 16 channels:
• Open load
• Short to +UBatt_C and -UBatt_C with or without connected load
• Contacts between lines ("Pin-to-Pin") with or without connected load
Time Response
The difference between switching an failure via a relay or via MOSFET is particu-
larly seen in the time response. Whereas MOSFETs have negligible switch times
(approx. 50 μs), relays have high switch times (the time it takes from activating
Note
An failure can only be applied for a maximum of five minutes – after this time,
the overtemperature protection facility may be activated. When using the
resistor cascade, please ensure that the ratio "power-on time/cooling time" is
25% or less.
Note
The high-voltage channels are only suitable for connecting magnetic valves and
piezo injectors (pulsating direct current voltage)! The maximum permissible
voltage is 250 V with a maximum pulse duration of 100 ms.