ECUs for off-highway applications

  • 23-Nov-2013 03:27 EST

In terms of connectivity, the HY-TTC 500 from TTControl features up to seven CAN interfaces for individual network architectures and maximum data throughput, automatic baudrate detection and configurable termination for CAN, and Ethernet for download and debugging purposes.

TTControl has designed the HY-TTC 500 product family as a high-end electronic control solution to satisfy needs for a wide range of applications, such as construction and agricultural machines. The freely programmable high-end controllers with a dual-core ARM Cortex-R4 lockstep processor are protected by a compact, automotive-style housing suited for harsh environments.

The controllers fulfill safety requirements up to SIL 2 (IEC 61508)/PL d (ISO 13849) and can be programmed either in C or in CODESYS. The safety certified CODESYS Safety SIL 2 speeds up application validation significantly, according to TTControl.

An extensive I/O set with various configuration options makes the HY-TTC 500 controllers suitable particularly adaptable. For example, a group of eight I/O pins can be individually configured for use as voltage output, digital output, or analog input. Another application is to build up a centralized architecture using one HY-TTC 500 controller for the whole vehicle. Commissioning time can be improved by using Ethernet for download and debugging purposes.

The majority of run-time tests that are needed to achieve the diagnostic coverage required for SIL 2/PL d is performed in the hardware by the dual-core lockstep CPU and its safety companion. Therefore, almost the full processor power is available for the application. The available memory protection mechanisms allow it to execute safety and non-safety software on the same ECU without interference. The time-consuming validation of non-safe software is therefore no longer necessary.

Safe data communication is achieved by the standardized CANopen safety protocol. In case of safety-relevant failure, outputs can be shut-off in three groups allowing limp-home functionality.

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