Method of detecting nitrogen compounds contained in exhaust gases, notably of internal-combustion engines
US9103745B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 12, 2013 |
| Grant date | Aug 11, 2015 |
| Priority date | — |
| Expiry date | Jul 12, 2033 |
Classification
- Technology area (CPC —)General
Abstract
A method of detecting nitrogen compound emissions in exhaust gases treated with selective catalytic reduction achieved by injecting a reducing agent into the gases and by passing these gases through a catalyst include sending the signal collected by a gas detector arranged in the exhaust gas downstream from the catalyst and representative of the amount of NOx (NOxsonde) at the catalyst outlet to a computing unit, decomposing this signal into a value representative of the effective NOx amount (NOxréel) at the outlet of catalyst established by the SCR catalyst model, into a detector perturbation coefficient (k) and into a value representative of the ammonia amount (NH3réel) via an integrated model so as to obtain NOxsonde=NOxréel+k.NH3, evaluating coefficient (k) from this decomposition, and determining the presence of nitrogen compounds downstream from the catalyst when coefficient (k) is greater than or equal to 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.