Active pulsation cancellation device for diesel particulate sampling systems
US6823748B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 2002 |
| Grant date | Nov 30, 2004 |
| Priority date | — |
| Expiry date | Jul 22, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2001/2264
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A particulate sampler is provided for conveying exhaust gas from exhaust gas source to analysis equipment. The particulate sampler includes a probe for receiving the exhaust gas and a transfer tube for conveying the exhaust gas from a tailpipe to a mixer. The mixer mixes the exhaust gas and a dilution gas from a dilution source. A dilution tunnel mixes and conveys the exhaust gas and dilution gas from the mixer to analysis equipment such as a filter or gas analyzers. A flow pulsation cancellation device includes an actuator in communication with at least one of the tailpipe, probe, transfer tube, mixer, and dilution tunnel for introducing a canceling pressure pulse to minimize the effects of pressures pulses present from the tailpipe within the sampler. The actuator may be a moveable membrane or a fluid flow control valve. Pressure sensors are used to measure the pressure of the undiluted and diluted exhaust gas, and a controller determines the desired canceling pressure pulse based upon the measured pressures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.