DCAT Overview

The Drivven Combustion Analysis Toolkit is a unique LabVIEW-based VI toolkit enabling users to integrate sophisticated combustion analysis and logging with engine control applications.  The initial release of the toolkit includes over 90 custom analysis functions, front panel controls and utilities including data streaming to disk, pre-processing, heat release and pressure metrics, summary data reporting and logging, post-processing, and knock and noise analysis.  DCAT leverages R-Series (FPGA) and S-Series (simultaneous analog sampling) cards from National Instruments to supervise engine position tracking and synchronization of data collection and processing.

When implemented with S-Series 6122 cards or better, custom digital information such as detailed multi-pulse injection commands can be stored with each cycle of data.  This allows researchers to review data at a later time and identify critical control parameters cycle by cycle.

DCAT allows streaming of raw data to file continuously, by cycle count, time, or file size.  Raw data files are stored in National Instrument’s popular TDMS format and include all channel configurations, engine geometry and custom test data to allow complete reconstruction of the test environment at a later date.  Cycle by cycle summaries of analysis parameters can also be logged to TDMS files for later review.  TDMS files may be opened and analyzed in Excel using a free TDMS file plug-in. 

The DCAT advanced example application may be used stand-alone, or integrated with an engine control application.  DCAT users may insert additional custom analysis and decision blocks for unique test and control applications.  A DCAT post-processing application example is also included which utilizes the same toolkit.

DCAT Features

Channel Configuration and Engine Geometry

• Supports multiple S-Series Cards for simultaneous sampling of signals in both engine-synchronous (cylinder pressure, etc.) and engine-asynchronous (knock, etc.) domains
• Subset of features supported with M-Series
• Individual channel scaling features
• Cylinder Assignment
• Gain
• Gain + Offset
• Polynomial
• Table Lookup
• Channels can be assigned to all cylinders as references such as pegging
• Complete set of engine geometry inputs for cylinder volume calculation
• Online motoring test assists with engine geometry verification

Engine Position Tracking and Sample Clock Generation

• Use traditional optical encoder setup or advanced triggering options via R-Series FPGA card
• Flexible FPGA-based crankshaft encoder signal processing and filtering
• Allows online adjustment of TDC index
• Allows use of pressure signal for 4-stroke cam phase information
• Allows cam phase signal to be extended for use as half-cycle gate for TDC index
• Engine Position Tracking (EPT) block allows extrapolation of lower resolution production trigger wheels for high-resolution sampling and control

Pre-Processing

• Cylinder alignment of data
• Data scaling to engineering units
• Broad range of signal filtering options
• Cylinder pressure pegging options

Pressure Metrics

• Peak Pressure and Location
• Polytropic coefficients of compression and expansion
• Maximum Rate of Pressure Rise and Location
• Pressures at IVO and EVC
• Gross MEP, Pumping MEP, Net MEP
• Misfire detection
  

Heat Release Analysis

• Methods include
• Single Zone
• Single Zone Dual Transducer (for pre-chamber engines)
• Single Zone + Heat Transfer
• Single Zone Dual Transducer + Heat Transfer
• Modified Rassweiler and Withrow
• Locations of Mass Fraction Burned (5%MFB, 25%MFB, 50%MFB, 75%MFB, 90%MFB, Custom)
• Maximum Heat Release Rate and Location
• Variety of heat transfer correction methods
• In-cylinder temperature estimation

 

Engine Noise and Knock Analysis

• Raw, time-domain-filtered and angle-domain-filtered noise indication
• Bandpass / Rectify / Integrate / Compare (BRIC) algorithm for knock signal processing
• Offline FFT analysis of knock signals for calibration of BRIC

Data Saving

• Stream raw and/or reduced data and configuration information to disk according to number of cycles, time or file size
• Files saved in popular, open TDMS binary format which can be opened with excel or post processed using DCAT

DCAT includes 1 year maintenance and support from date of purchase

Documentation

Code:D000054

$14,995.00