Horiba system accurately measures diluted mass emissions from vehicles, engines

  • 05-Apr-2013 04:15 EDT
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The CVS-ONE system offers a wide range of dilution flow rate options and separate sample line functionality while maintaining high accuracy.

At SAE 2013 World Congress in Detroit April 16-18, Horiba (booth 601) is launching the second of its "ONE Series" products, the dilute system comprised of CVS-ONE (Constant Volume Sampler) and MEXA-ONE designed for the measurement of diluted exhaust gas from vehicles and engines. ONE Series products operate off an integrated software platform for more efficient and flexible testing.

“We have been able to optimize this system to use with a wide range of vehicles so that we don’t over-dilute the exhaust sample and you’re able to measure concentrations and mass emissions accurately,” said Rick Rooney, Emissions Technology Specialist, Horiba.

The new sampling system, when used in conjunction with the MEXA-ONE motor exhaust gas analyzer, allows for the measurement of extremely low emission levels required for SULEV (super ultra-low emission vehicle), Tier 3/LEV III, and Euro 6 classifications.

CVS-ONE is a flexible system that ensures reliable and highly accurate emissions testing through the adoption of new functions, improved usability, and support for a wide range of test applications. Featuring 65% less volume and a 70% smaller footprint than comparable Horiba products, CVS-ONE has a compact and user-friendly design, allowing for a more flexible test cell layout.

“The system has been repackaged and redesigned to minimize the size of the components within the CVS-ONE and enable installation into smaller test cells,” Rooney said.

The system offers a wide range of dilution flow rate options and separate sample line functionality while maintaining high accuracy. One single system covers a variety of applications such as diverse engine sizes, vehicle testing cycles, and fuel types (gasoline, diesel, and alternative fuels).

“Through a combination of the Horiba One platform software and the system design using multiple CVS flow rates, we can measure a wide range of vehicles across a wide range of applications,” Rooney said.

The new CVS-ONE is especially suited for certification tests and highly accurate fuel-consumption measurement, with improved measurement accuracy of CO2.

“With advanced powertrains such as hybrids and plug-in hybrids, the internal-combustion engine is not operating all the time when you’re running through the test cycles. Therefore, there’s very little exhaust to collect and measure during a test cycle,” Rooney said. “Because there’s very little exhaust in which to measure, our system has to be able to measure very low concentrations of CO2 and other constituents.”

Apart from complying with the latest emissions regulations—Euro 5/6, Euro VI, and U.S. EPA regulation 40 CFR Part 1065—CVS-ONE also supports future regulations such as WLTP (worldwide harmonized light vehicles test procedures) or GTR (global technical regulations) that are currently under consideration. Its advanced bag sampling techniques and the flexibility of the number of bags and combinations promote a variety of testing cycles. In addition, fuel consumption measurement of modern powertrain concepts is now possible, with support for hybrid and plug-in hybrid vehicles.

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