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case studies
etaS gmbh:
Solutions Guide 2011
aSam mCD-1 XCP (ethernet)
Deployed as a real-time interface
in innovative Combustion Control
Development Systems
The ASAM MCD-1 XCP based ETAS real-time communication
interface allowed us to integrate our FI 2RE ignition
and injection system with the ES910 prototyping platform
within a short time.
(Thomas Kracke, IAV GmbH)
Summary
Challenge: Increasingly stringent legislation on
combustion engine emissions calls for some
form of tight combustion control. In electronic
engine management systems, this requires the
integration of additional sensor information regarding
the combustion process.
Solution: Internal cylinder pressure readings
provide reliable statements with regard to
combustion quality. In a joint project with IAV
GmbH and ETAS GmbH, engineers at Daimler
AG have designed a system that facilitates cylinder
pressure-based combustion control.
Key Benefits: The modular system handles the
crank angle synchronous acquisition of internal
cylinder pressure, calculates required variables,
and stabilizes the combustion process
by means of suitable control loops.
Situation
Daimler AG engineers, together with IAV
GmbH and ETAS GmbH have designed a system
that facilitates the rapid visualization of a
prototypical combustion control based on cylinder
pressure.
ChallengeS
Increasingly stringent legislation on combustion
engine emissions calls for controlled combustion
processes. As one of the prerequisites for
effective combustion control, additional sensor
information concerning the combustion process
must be integrated in the engine management
ECU. One such additional data type is
the internal cylinder pressure. It provides the
most reliable information on combustion characteristics.
The cylinder pressure curve must
be converted to control variables in real time.
SuCCeSS Strategy
The modular combustion control system handles
the crank angle synchronous acquisition of
the internal cylinder pressure, calculates the required
variables, and stabilizes the combustion
by means of suitable control loops.
Both the acquisition of cylinder pressure data
and the calculation of characteristics are handled
by IAV’s modular FI 2RE Flexible Injection
and Ignition for Rapid Engineering, which contains
the Thermodynamic Real-Time Analysis
(TRA) module specifically developed for this
purpose. The TRA board comprises an analog
front end for signal acquisition, analog filters,
several high-speed A/D converters, a Field
Programmable Gate Array (FPGA), dualported
RAM (DPR), a digital signal processor
(DSP), plus a variety of interfaces (CAN, SPI,
RS-232, and USB). The FI 2RE hardware for realtime
indexing without the additional injection
functions also forms the basis for the new “IAV
Indicar”, a freely programmable and vehiclecompatible
real-time indication system.
Subsequent to their calculation, the combustion
characteristics are transferred via Ethernet
to the superimposed ES910 Prototyping and
Interface Module. The MATLAB ® /Simulink ®
control functions running on the ES910 use
this and additional input to determine individual
control variables for the subsequent injection
cycle of each cylinder. Ahead of the next
combustion cycle, these variables are trans-