Applications
- Automation of test cells with MEXA/CVS 7000 and MEXA/CVS 9000 series systems.
- Emissions testing of gasoline and diesel fueled vehicles.
- Certification according to EPA, CARB, Japan and EU Regulations.
- Development tests requiring real-time analysis of exhaust-emission constituents at various sample points.
- Emissions verification and component evaluation.
Features
- Flexible and open test-control and evaluation system.
- Economical standard configurations for a variety of applications.
- Windows NT operating system using a standard PC.
- Sophisticated results database.
- Use of standard software packages: Excel®, ODBC, SQL, National Instruments®, BridgeView®.
- Use of National Instruments ServerExplorer software for device configuration - allows customer-configuration of test-cell equipment.
- Reports created using Excel® templates, modifiable for design and calculation changes.
- Real-time, user-modifiable graphic display, using BridgeView®.
- Graphical test editor to create or edit test descriptions, drive traces, and shift files.
Multiple languages - English, German, French.
Emissions Testing Functions
Emissions tests consist of four parts: Pretest/initialization, driver's cycle, analysis, and post-test/reporting.
Pretest/Initialization
VETS 7000NT collects information from the operator, reads and displays the Weather Station values, and initializes the CVS, MEXA and CRSD 7000.
Driver´s Cycle
Standard test schedules delivered with the system include:
- EPA 74
- EPA 75
- EPA 75, Phase 1 and 2
- EPA 75, Phase 1
- EPA Highway Fuel Economy
- ECE 15.04
- ECE 15.05 High Speed
- Japan 10.15 Mode
- Japan 11 Mode
- User-defined tests
Other schedules available upon request.
VETS 7000NT controls the test sequence, collects data, and provides a real-time graphic-numeric display. CRSD 7000 displays the drive trace, shift points, and driver messages. All data is logged and stored as raw values in real-time. Variable delay times can be applied after test completion.
Pre-defined test sequences control test operation. The user selects or defines files to control sample delays, timed events, shift-point table, ambient limits and fuel type.
Analysis
For gasoline and diesel-fueled vehicles, depending on test-cell equipment
- Bag
- Modal mass Pre-catalyst, intermediate, tailpipe, dilute
- Catalyst efficiency
- Dual-catalyst efficiency
- EGR
- Particulates
- General-purpose analog signals
Bag-read function depends on bench and CVS types. Sequence includes:
- Select analyzer
- Sniff in auto-range mode
- Select range
- Zero/Span/Zero
- Read sample bag
- Read ambient bag
- Zero/Span drift check (if applicable)
- Display results
- Auto measurement of bag-reading stability
- Flow alarm on bag read
- All data stored and time stamped
- Post-test/Reporting
End of test includes setting equipment to Standby and final messages/instructions to the operator.
Reports are in user-definable Microsoft Excel templates. Test request can specify automatic reports. User can manually run additional reports on any data in the database.
Configuration Editors
- I/O Configuration
- Driver's Traces
- Gearshift Tables
- Test Descriptors
- Fuel Files
- Event Tables
Calibration/QC Utilities (MEXA 9000/CVS 9000)
- Analyzer Linearization (Curve Calibration)
- NOx Converter Efficiency Check
- CO2 Interference Check
- Stand-alone Zero/Span Check
- Stand-alone Bag Read
- CVS Injection Check