Boost Rt description

AVL Advanced Simulation Technologies 2009 AVL List GmbH Hans-List-Platz 1, A-8020 Graz, Austria E-mail: [email protected], http://www.avl.com

AVL PRODUCT DESCRIPTION BOOST RT

BOOST RT

BOOST RT is a real-time capable, system-level, engine simulation tool dedicated for the investigation of transient operating conditions offline in desktop applications and online in HiL environments. BOOST RT is the consequent next step to further integrate the well established BOOST 1D Cycle Simulation tool and CRUISE, the vehicle dynamics, fuel consumption and emission simulation package. BOOST RT focuses on three main application areas used in the different engine development phases:

Applications

1. Concept Development Phase: BOOST RT supports a fast setup and simulation of engine design variants without considering all details of pipe gas dynamics to get guidelines on engine performance.

2. Powertrain Design Phase: BOOST RT engine runs drive cycles fully coupled with a detailed vehicle model (build in CRUISE) resolving both engine and vehicle dynamics with adequate level of modeling depth within reasonable computational times.

3. Component, Powertrain, Vehicle Test Phase: BOOST RT engine runs as plant model to support the development, calibration and testing of engine control functions.

Functionality

BOOST RT is an engine simulation package running in the time domain using transient and steady-state 0D and quasi-dimensional component models.

Basic flow characteristics are modeled by steady-state approaches and maps Engine characteristics can be described by two different approaches


1. Crank-angle resolved description of cylinders (including ports) within the framework of time resolved gas-path, thermal, mechanical and control network components

2. Surrogate engine modeling using Support Vector Machines to predict arbitrary engine quantities (air delivery, torque, wall heat losses, exhaust enthalpy flow, emissions, fuel consumption,...) trained on arbitrary data (engine speed, intake pressure, EGR rate, injected fuel,...) from either test-bed measurements or highly resolved BOOST Cycle Simulation models

BOOST RT offers dedicated base engine elements to ensure the highest possible flexibility in assembling modern engines and engine component topologies. The chosen elements and modeling interface ensures a fast model setup

BOOST RT elements are split into five main groups: Gas Path: Gas Properties, Plenum,

Air Cleaner, Heat Transfer, Constant Mass Flow, Engine, Cylinder, Compressor, Fuel Tank, Wall Film, Surrogate Engine, Port, Turbine, Restriction and Ambient

Thermal Network: Solid Wall and Heat Exchanger

Mechanical Network: Shaft, Single Ratio Transmission, Mechanical Consumer, Flange and CRUISE Vehicle

Control Network: Characteristic/Map, Function/Formula Interpreter, PID Controller, Map of Tables and Surrogate Model

Interface: C-Interface, Matlab DLL and Matlab API

BOOST RT offers dedicated models for all of the above listed engine components. The main features are:

Gas Path, Thermal and Mechanical Network

Classic and general species transport supported by appropriate gas properties and species balance

equations Cylinder heat transfer modeling according to Woschni 1978 and 1990, Hohenberg and AVL 2000

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AVL Advanced Simulation Technologies 2008 AVL List GmbH Hans-List-Platz 1, A-8020 Graz, Austria E-mail: [email protected], http://www.avl.com/ast


Engine combustion modeling using Vibe and user specified ROHR tables Direct injection modeling covering ROHR controlled fuel injection or user defined ROI

specification

Engine friction modeling via pre-defined model approaches (Patton, Shayler) or user input Port heat transfer modeling according to Zapf or user specified Fuel injection in restriction or ports User defined build up of wall film and temperature, pressure and evaporation driven film

evaporation

Load map dependent input of user specified tables for ROHR, ROI and valve lift curves Turbine modeling via map input covering VTG, internal waste gate and correction table input Compressor modeling via map input Power assisted compressor modeling using mechanical network components Air cleaner modeling using adequate pressure drop approaches in analogy to the models of

BOOST Cycle Simulation

Heat exchanger modeling using adequate pressure drop and heat transfer approaches in analogy to the models of BOOST Cycle Simulation

Direct model parameter exchange for main engine components (cylinder, port, compressor, turbine) between BOOST Cycle Simulation and BOOST RT

Simplified torque consumer modeling via torque consumer maps High resolved vehicle description by integrating full CRUISE vehicle model including driver

model, drive cycle or full load acceleration description Control Network BOOST RT offers several components in order to steer, control and calibrate models according to arbitrary user requirements. The main features are:

Flexible network of actuator and sensor channels for various control modeling Engine load point specification via time dependent tables for fueling or throttle position Pre-defined idle speed control model Control of engine fueling, EGR rate, injection profile, or VVT, Air/Fuel ratio etc. using BOOST

RT control network components or BOOST RT interface to third party software. Interface

BOOST RT offers three options to run the model coupled with other simulation tools. The interfaces are:

Arbitrary C-interface to run BOOST RT out of any other third party software S-function block of BOOST RT to run it out of Simulink DLL and API interface to Matlab

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General

BOOST RT offers:

Dedicated numerical solvers for explicit constant time step and implicit adaptive time step integration

Fully coupled numerical integration of the gas path, thermal, mechanical and control network Integration in AVL Workspace providing all capability of:

o Case Explorer for parameter variation studies

o Design Explorer for DoE, parameter optimization and surrogate model training

o IMPRESS Chart for result analysis, result processing and reporting of all produced result curves

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Documents

Boost Rt description